Merge remote-tracking branch 'origin/abeck/OP_1503v3-yaffs' into next

flight/pios/common/libraries/yaffs2/README.txt

@@ -0,0 +1,32 @@
+yaffs2 library in flight/pios/common/libraries/yaffs2
+
+Implementation of core Yaffs Direct:
+	yaffs_allocator.c 	Allocates Yaffs object and tnode structures.
+	yaffs_checkpointrw.c 	Streamer for writing checkpoint data
+	yaffs_ecc.c 		ECC code
+	yaffs_guts.c 		The major Yaffs algorithms.
+	yaffs_nand.c		Flash interfacing abstraction.
+	yaffs_packedtags1.c 	Tags packing code
+	yaffs_packedtags2.c
+	yaffs_qsort.c		Qsort used during Yaffs2 scanning
+	yaffs_tagscompat.c 	Tags compatibility code to support Yaffs1 mode.
+	yaffs_tagsvalidity.c 	Tags validity checking.
+	yaffsfs.c		The Yaffs direct interface 
+	yaffs_hweight.c		Linux hweight implementation equivalent (Is this in OP TODO)
+	yaffs_list.c		Linked list implementation
+	yaffs_tarsmarshall.c
+Interface between Yaffs and OP PiOS or Posix:
+	ydirectenv.h 		Environment wrappers for Yaffs direct to suit the OP firmware environment
+	yaffs_osglue.h		Interface for Yaffs to use to access OS method
+Interface to Yaffs Direct:
+	yaffsfs.h		and interface structures and functions defined here
+
+POSIX Implementation in flight/pios/common/libraries/posix
+PiOS Implementation in flight/pios/common/libraries/PiOS
+
+CHANGE LOG:
+1. Initial import
+2. ydirectenv.h		Defined Y_LOFF_T to be int32_t.  Needs to be signed to return -1 for lseek invalid
+3. library.mk		Compiler defines to set yaffs2 diect mode and port options
+4. simposix		Added simposix implementation of lower layers
+5. arm compilation	Addressed compile errors in arm toolchain. Generally marked changes with CONFIG_YAFFS_OP

flight/pios/common/libraries/yaffs2/inc/yaffs_allocator.h

@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ALLOCATOR_H__
+#define __YAFFS_ALLOCATOR_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev);
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev);
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn);
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev);
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_attribs.h

@@ -0,0 +1,28 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ATTRIBS_H__
+#define __YAFFS_ATTRIBS_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh);
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj);
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev);
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c);
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_bitmap.h

@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+#ifndef __YAFFS_BITMAP_H__
+#define __YAFFS_BITMAP_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk);
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk);
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_checkptrw.h

@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_CHECKPTRW_H__
+#define __YAFFS_CHECKPTRW_H__
+
+#include "yaffs_guts.h"
+
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing);
+
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes);
+
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes);
+
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum);
+
+int yaffs_checkpt_close(struct yaffs_dev *dev);
+
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_ecc.h

@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data.
+ * Thus, two such ECC blocks are used on a 512-byte NAND page.
+ *
+ */
+
+#ifndef __YAFFS_ECC_H__
+#define __YAFFS_ECC_H__
+
+struct yaffs_ecc_other {
+	unsigned char col_parity;
+	unsigned line_parity;
+	unsigned line_parity_prime;
+};
+
+void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc);
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+		      const unsigned char *test_ecc);
+
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+			  struct yaffs_ecc_other *ecc);
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+			    struct yaffs_ecc_other *read_ecc,
+			    const struct yaffs_ecc_other *test_ecc);
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_flashif.h

@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_FLASH_H__
+#define __YAFFS_FLASH_H__
+
+
+#include "yaffs_guts.h"
+int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber);
+int yflash_WriteChunkToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_spare *spare);
+int yflash_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_ext_tags *tags);
+int yflash_ReadChunkFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_spare *spare);
+int yflash_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_ext_tags *tags);
+int yflash_InitialiseNAND(struct yaffs_dev *dev);
+int yflash_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no);
+int yflash_QueryNANDBlock(struct yaffs_dev *dev, int block_no,
+			enum yaffs_block_state *state, u32 *seq_number);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_flashif2.h

@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_FLASH2_H__
+#define __YAFFS_FLASH2_H__
+
+
+#include "yaffs_guts.h"
+int yflash2_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber);
+int yflash2_WriteChunkToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_spare *spare);
+int yflash2_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
+			const u8 *data, const struct yaffs_ext_tags *tags);
+int yflash2_ReadChunkFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_spare *spare);
+int yflash2_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
+			u8 *data, struct yaffs_ext_tags *tags);
+int yflash2_InitialiseNAND(struct yaffs_dev *dev);
+int yflash2_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no);
+int yflash2_QueryNANDBlock(struct yaffs_dev *dev, int block_no,
+			enum yaffs_block_state *state, u32 *seq_number);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_getblockinfo.h

@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GETBLOCKINFO_H__
+#define __YAFFS_GETBLOCKINFO_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+
+/* Function to manipulate block info */
+static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev
+							      *dev, int blk)
+{
+	if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>> yaffs: get_block_info block %d is not valid",
+			blk);
+		BUG();
+	}
+	return &dev->block_info[blk - dev->internal_start_block];
+}
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_guts.h

@@ -0,0 +1,1010 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GUTS_H__
+#define __YAFFS_GUTS_H__
+
+#include "yportenv.h"
+
+#define YAFFS_OK	1
+#define YAFFS_FAIL  0
+
+/* Give us a  Y=0x59,
+ * Give us an A=0x41,
+ * Give us an FF=0xff
+ * Give us an S=0x53
+ * And what have we got...
+ */
+#define YAFFS_MAGIC			0x5941ff53
+
+/*
+ * Tnodes form a tree with the tnodes in "levels"
+ * Levels greater than 0 hold 8 slots which point to other tnodes.
+ * Those at level 0 hold 16 slots which point to chunks in NAND.
+ *
+ * A maximum level of 8 thust supports files of size up to:
+ *
+ * 2^(3*MAX_LEVEL+4)
+ *
+ * Thus a max level of 8 supports files with up to 2^^28 chunks which gives
+ * a maximum file size of around 512Gbytees with 2k chunks.
+ */
+#define YAFFS_NTNODES_LEVEL0		16
+#define YAFFS_TNODES_LEVEL0_BITS	4
+#define YAFFS_TNODES_LEVEL0_MASK	0xf
+
+#define YAFFS_NTNODES_INTERNAL		(YAFFS_NTNODES_LEVEL0 / 2)
+#define YAFFS_TNODES_INTERNAL_BITS	(YAFFS_TNODES_LEVEL0_BITS - 1)
+#define YAFFS_TNODES_INTERNAL_MASK	0x7
+#define YAFFS_TNODES_MAX_LEVEL		8
+#define YAFFS_TNODES_MAX_BITS		(YAFFS_TNODES_LEVEL0_BITS + \
+					YAFFS_TNODES_INTERNAL_BITS * \
+					YAFFS_TNODES_MAX_LEVEL)
+#define YAFFS_MAX_CHUNK_ID		((1 << YAFFS_TNODES_MAX_BITS) - 1)
+
+#define YAFFS_MAX_FILE_SIZE_32		0x7fffffff
+
+/* Constants for YAFFS1 mode */
+#define YAFFS_BYTES_PER_SPARE		16
+#define YAFFS_BYTES_PER_CHUNK		512
+#define YAFFS_CHUNK_SIZE_SHIFT		9
+#define YAFFS_CHUNKS_PER_BLOCK		32
+#define YAFFS_BYTES_PER_BLOCK	(YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
+
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE	1024
+#define YAFFS_MIN_YAFFS2_SPARE_SIZE	32
+
+
+
+#define YAFFS_ALLOCATION_NOBJECTS	100
+#define YAFFS_ALLOCATION_NTNODES	100
+#define YAFFS_ALLOCATION_NLINKS		100
+
+#define YAFFS_NOBJECT_BUCKETS		256
+
+#define YAFFS_OBJECT_SPACE		0x40000
+#define YAFFS_MAX_OBJECT_ID		(YAFFS_OBJECT_SPACE - 1)
+
+/* Binary data version stamps */
+#define YAFFS_SUMMARY_VERSION		1
+#define YAFFS_CHECKPOINT_VERSION	7
+
+#ifdef CONFIG_YAFFS_UNICODE
+#define YAFFS_MAX_NAME_LENGTH		127
+#define YAFFS_MAX_ALIAS_LENGTH		79
+#else
+#define YAFFS_MAX_NAME_LENGTH		255
+#define YAFFS_MAX_ALIAS_LENGTH		159
+#endif
+
+#define YAFFS_SHORT_NAME_LENGTH		15
+
+/* Some special object ids for pseudo objects */
+#define YAFFS_OBJECTID_ROOT		1
+#define YAFFS_OBJECTID_LOSTNFOUND	2
+#define YAFFS_OBJECTID_UNLINKED		3
+#define YAFFS_OBJECTID_DELETED		4
+
+/* Fake object Id for summary data */
+#define YAFFS_OBJECTID_SUMMARY		0x10
+
+/* Pseudo object ids for checkpointing */
+#define YAFFS_OBJECTID_CHECKPOINT_DATA	0x20
+#define YAFFS_SEQUENCE_CHECKPOINT_DATA	0x21
+
+#define YAFFS_MAX_SHORT_OP_CACHES	20
+
+#define YAFFS_N_TEMP_BUFFERS		6
+
+/* We limit the number attempts at sucessfully saving a chunk of data.
+ * Small-page devices have 32 pages per block; large-page devices have 64.
+ * Default to something in the order of 5 to 10 blocks worth of chunks.
+ */
+#define YAFFS_WR_ATTEMPTS		(5*64)
+
+/* Sequence numbers are used in YAFFS2 to determine block allocation order.
+ * The range is limited slightly to help distinguish bad numbers from good.
+ * This also allows us to perhaps in the future use special numbers for
+ * special purposes.
+ * EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years,
+ * and is a larger number than the lifetime of a 2GB device.
+ */
+#define YAFFS_LOWEST_SEQUENCE_NUMBER	0x00001000
+#define YAFFS_HIGHEST_SEQUENCE_NUMBER	0xefffff00
+
+/* Special sequence number for bad block that failed to be marked bad */
+#define YAFFS_SEQUENCE_BAD_BLOCK	0xffff0000
+
+/* ChunkCache is used for short read/write operations.*/
+struct yaffs_cache {
+	struct yaffs_obj *object;
+	int chunk_id;
+	int last_use;
+	int dirty;
+	int n_bytes;		/* Only valid if the cache is dirty */
+	int locked;		/* Can't push out or flush while locked. */
+	u8 *data;
+};
+
+/* yaffs1 tags structures in RAM
+ * NB This uses bitfield. Bitfields should not straddle a u32 boundary
+ * otherwise the structure size will get blown out.
+ */
+
+struct yaffs_tags {
+	u32 chunk_id:20;
+	u32 serial_number:2;
+	u32 n_bytes_lsb:10;
+	u32 obj_id:18;
+	u32 ecc:12;
+	u32 n_bytes_msb:2;
+};
+
+union yaffs_tags_union {
+	struct yaffs_tags as_tags;
+	u8 as_bytes[8];
+};
+
+
+/* Stuff used for extended tags in YAFFS2 */
+
+enum yaffs_ecc_result {
+	YAFFS_ECC_RESULT_UNKNOWN,
+	YAFFS_ECC_RESULT_NO_ERROR,
+	YAFFS_ECC_RESULT_FIXED,
+	YAFFS_ECC_RESULT_UNFIXED
+};
+
+enum yaffs_obj_type {
+	YAFFS_OBJECT_TYPE_UNKNOWN,
+	YAFFS_OBJECT_TYPE_FILE,
+	YAFFS_OBJECT_TYPE_SYMLINK,
+	YAFFS_OBJECT_TYPE_DIRECTORY,
+	YAFFS_OBJECT_TYPE_HARDLINK,
+	YAFFS_OBJECT_TYPE_SPECIAL
+};
+
+#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
+
+struct yaffs_ext_tags {
+	unsigned chunk_used;	/*  Status of the chunk: used or unused */
+	unsigned obj_id;	/* If 0 this is not used */
+	unsigned chunk_id;	/* If 0 this is a header, else a data chunk */
+	unsigned n_bytes;	/* Only valid for data chunks */
+
+	/* The following stuff only has meaning when we read */
+	enum yaffs_ecc_result ecc_result;
+	unsigned block_bad;
+
+	/* YAFFS 1 stuff */
+	unsigned is_deleted;	/* The chunk is marked deleted */
+	unsigned serial_number;	/* Yaffs1 2-bit serial number */
+
+	/* YAFFS2 stuff */
+	unsigned seq_number;	/* The sequence number of this block */
+
+	/* Extra info if this is an object header (YAFFS2 only) */
+
+	unsigned extra_available;	/* Extra info available if not zero */
+	unsigned extra_parent_id;	/* The parent object */
+	unsigned extra_is_shrink;	/* Is it a shrink header? */
+	unsigned extra_shadows;	/* Does this shadow another object? */
+
+	enum yaffs_obj_type extra_obj_type;	/* What object type? */
+
+	Y_LOFF_T extra_file_size;		/* Length if it is a file */
+	unsigned extra_equiv_id;	/* Equivalent object for a hard link */
+};
+
+/* Spare structure for YAFFS1 */
+struct yaffs_spare {
+	u8 tb0;
+	u8 tb1;
+	u8 tb2;
+	u8 tb3;
+	u8 page_status;		/* set to 0 to delete the chunk */
+	u8 block_status;
+	u8 tb4;
+	u8 tb5;
+	u8 ecc1[3];
+	u8 tb6;
+	u8 tb7;
+	u8 ecc2[3];
+};
+
+/*Special structure for passing through to mtd */
+struct yaffs_nand_spare {
+	struct yaffs_spare spare;
+	int eccres1;
+	int eccres2;
+};
+
+/* Block data in RAM */
+
+enum yaffs_block_state {
+	YAFFS_BLOCK_STATE_UNKNOWN = 0,
+
+	YAFFS_BLOCK_STATE_SCANNING,
+	/* Being scanned */
+
+	YAFFS_BLOCK_STATE_NEEDS_SCAN,
+	/* The block might have something on it (ie it is allocating or full,
+	 * perhaps empty) but it needs to be scanned to determine its true
+	 * state.
+	 * This state is only valid during scanning.
+	 * NB We tolerate empty because the pre-scanner might be incapable of
+	 * deciding
+	 * However, if this state is returned on a YAFFS2 device,
+	 * then we expect a sequence number
+	 */
+
+	YAFFS_BLOCK_STATE_EMPTY,
+	/* This block is empty */
+
+	YAFFS_BLOCK_STATE_ALLOCATING,
+	/* This block is partially allocated.
+	 * At least one page holds valid data.
+	 * This is the one currently being used for page
+	 * allocation. Should never be more than one of these.
+	 * If a block is only partially allocated at mount it is treated as
+	 * full.
+	 */
+
+	YAFFS_BLOCK_STATE_FULL,
+	/* All the pages in this block have been allocated.
+	 * If a block was only partially allocated when mounted we treat
+	 * it as fully allocated.
+	 */
+
+	YAFFS_BLOCK_STATE_DIRTY,
+	/* The block was full and now all chunks have been deleted.
+	 * Erase me, reuse me.
+	 */
+
+	YAFFS_BLOCK_STATE_CHECKPOINT,
+	/* This block is assigned to holding checkpoint data. */
+
+	YAFFS_BLOCK_STATE_COLLECTING,
+	/* This block is being garbage collected */
+
+	YAFFS_BLOCK_STATE_DEAD
+	    /* This block has failed and is not in use */
+};
+
+#define	YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
+
+struct yaffs_block_info {
+
+	s32 soft_del_pages:10;	/* number of soft deleted pages */
+	s32 pages_in_use:10;	/* number of pages in use */
+	u32 block_state:4;	/* One of the above block states. */
+				/* NB use unsigned because enum is sometimes
+				 * an int */
+	u32 needs_retiring:1;	/* Data has failed on this block, */
+				/*need to get valid data off and retire*/
+	u32 skip_erased_check:1;/* Skip the erased check on this block */
+	u32 gc_prioritise:1;	/* An ECC check or blank check has failed.
+				   Block should be prioritised for GC */
+	u32 chunk_error_strikes:3;	/* How many times we've had ecc etc
+				failures on this block and tried to reuse it */
+	u32 has_summary:1;	/* The block has a summary */
+
+	u32 has_shrink_hdr:1;	/* This block has at least one shrink header */
+	u32 seq_number;		/* block sequence number for yaffs2 */
+
+};
+
+/* -------------------------- Object structure -------------------------------*/
+/* This is the object structure as stored on NAND */
+
+struct yaffs_obj_hdr {
+	enum yaffs_obj_type type;
+
+	/* Apply to everything  */
+	int parent_obj_id;
+	u16 sum_no_longer_used;	/* checksum of name. No longer used */
+	YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+	/* The following apply to all object types except for hard links */
+	u32 yst_mode;		/* protection */
+
+	u32 yst_uid;
+	u32 yst_gid;
+	u32 yst_atime;
+	u32 yst_mtime;
+	u32 yst_ctime;
+
+	/* File size  applies to files only */
+	u32 file_size_low;
+
+	/* Equivalent object id applies to hard links only. */
+	int equiv_id;
+
+	/* Alias is for symlinks only. */
+	YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
+
+	u32 yst_rdev;	/* stuff for block and char devices (major/min) */
+
+	u32 win_ctime[2];
+	u32 win_atime[2];
+	u32 win_mtime[2];
+
+	u32 inband_shadowed_obj_id;
+	u32 inband_is_shrink;
+
+	u32 file_size_high;
+	u32 reserved[1];
+	int shadows_obj;	/* This object header shadows the
+				specified object if > 0 */
+
+	/* is_shrink applies to object headers written when wemake a hole. */
+	u32 is_shrink;
+
+};
+
+/*--------------------------- Tnode -------------------------- */
+
+struct yaffs_tnode {
+	struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
+};
+
+/*------------------------  Object -----------------------------*/
+/* An object can be one of:
+ * - a directory (no data, has children links
+ * - a regular file (data.... not prunes :->).
+ * - a symlink [symbolic link] (the alias).
+ * - a hard link
+ */
+
+struct yaffs_file_var {
+	Y_LOFF_T file_size;
+	Y_LOFF_T scanned_size;
+	Y_LOFF_T shrink_size;
+	int top_level;
+	struct yaffs_tnode *top;
+};
+
+struct yaffs_dir_var {
+	struct list_head children;	/* list of child links */
+	struct list_head dirty;	/* Entry for list of dirty directories */
+};
+
+struct yaffs_symlink_var {
+	YCHAR *alias;
+};
+
+struct yaffs_hardlink_var {
+	struct yaffs_obj *equiv_obj;
+	u32 equiv_id;
+};
+
+union yaffs_obj_var {
+	struct yaffs_file_var file_variant;
+	struct yaffs_dir_var dir_variant;
+	struct yaffs_symlink_var symlink_variant;
+	struct yaffs_hardlink_var hardlink_variant;
+};
+
+struct yaffs_obj {
+	u8 deleted:1;		/* This should only apply to unlinked files. */
+	u8 soft_del:1;		/* it has also been soft deleted */
+	u8 unlinked:1;		/* An unlinked file.*/
+	u8 fake:1;		/* A fake object has no presence on NAND. */
+	u8 rename_allowed:1;	/* Some objects cannot be renamed. */
+	u8 unlink_allowed:1;
+	u8 dirty:1;		/* the object needs to be written to flash */
+	u8 valid:1;		/* When the file system is being loaded up, this
+				 * object might be created before the data
+				 * is available
+				 * ie. file data chunks encountered before
+				* the header.
+				 */
+	u8 lazy_loaded:1;	/* This object has been lazy loaded and
+				 * is missing some detail */
+
+	u8 defered_free:1;	/* Object is removed from NAND, but is
+				 * still in the inode cache.
+				 * Free of object is defered.
+				 * until the inode is released.
+				 */
+	u8 being_created:1;	/* This object is still being created
+				 * so skip some verification checks. */
+	u8 is_shadowed:1;	/* This object is shadowed on the way
+				 * to being renamed. */
+
+	u8 xattr_known:1;	/* We know if this has object has xattribs
+				 * or not. */
+	u8 has_xattr:1;		/* This object has xattribs.
+				 * Only valid if xattr_known. */
+
+	u8 serial;		/* serial number of chunk in NAND.*/
+	u16 sum;		/* sum of the name to speed searching */
+
+	struct yaffs_dev *my_dev;	/* The device I'm on */
+
+	struct list_head hash_link;	/* list of objects in hash bucket */
+
+	struct list_head hard_links;	/* hard linked object chain*/
+
+	/* directory structure stuff */
+	/* also used for linking up the free list */
+	struct yaffs_obj *parent;
+	struct list_head siblings;
+
+	/* Where's my object header in NAND? */
+	int hdr_chunk;
+
+	int n_data_chunks;	/* Number of data chunks for this file. */
+
+	u32 obj_id;		/* the object id value */
+
+	u32 yst_mode;
+
+	YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
+
+#ifdef CONFIG_YAFFS_WINCE
+	u32 win_ctime[2];
+	u32 win_mtime[2];
+	u32 win_atime[2];
+#else
+	u32 yst_uid;
+	u32 yst_gid;
+	u32 yst_atime;
+	u32 yst_mtime;
+	u32 yst_ctime;
+#endif
+
+	u32 yst_rdev;
+
+	void *my_inode;
+
+	enum yaffs_obj_type variant_type;
+
+	union yaffs_obj_var variant;
+
+};
+
+struct yaffs_obj_bucket {
+	struct list_head list;
+	int count;
+};
+
+/* yaffs_checkpt_obj holds the definition of an object as dumped
+ * by checkpointing.
+ */
+
+struct yaffs_checkpt_obj {
+	int struct_type;
+	u32 obj_id;
+	u32 parent_id;
+	int hdr_chunk;
+	enum yaffs_obj_type variant_type:3;
+	u8 deleted:1;
+	u8 soft_del:1;
+	u8 unlinked:1;
+	u8 fake:1;
+	u8 rename_allowed:1;
+	u8 unlink_allowed:1;
+	u8 serial;
+	int n_data_chunks;
+	Y_LOFF_T size_or_equiv_obj;
+};
+
+/*--------------------- Temporary buffers ----------------
+ *
+ * These are chunk-sized working buffers. Each device has a few.
+ */
+
+struct yaffs_buffer {
+	u8 *buffer;
+	int in_use;
+};
+
+/*----------------- Device ---------------------------------*/
+
+struct yaffs_param {
+	const YCHAR *name;
+
+	/*
+	 * Entry parameters set up way early. Yaffs sets up the rest.
+	 * The structure should be zeroed out before use so that unused
+	 * and default values are zero.
+	 */
+
+	int inband_tags;	/* Use unband tags */
+	u32 total_bytes_per_chunk;	/* Should be >= 512, does not need to
+					 be a power of 2 */
+	int chunks_per_block;	/* does not need to be a power of 2 */
+	int spare_bytes_per_chunk;	/* spare area size */
+	int start_block;	/* Start block we're allowed to use */
+	int end_block;		/* End block we're allowed to use */
+	int n_reserved_blocks;	/* Tuneable so that we can reduce
+				 * reserved blocks on NOR and RAM. */
+
+	int n_caches;		/* If <= 0, then short op caching is disabled,
+				 * else the number of short op caches.
+				 */
+	int cache_bypass_aligned; /* If non-zero then bypass the cache for
+				   * aligned writes.
+				   */
+
+	int use_nand_ecc;	/* Flag to decide whether or not to use
+				 * NAND driver ECC on data (yaffs1) */
+	int tags_9bytes;	/* Use 9 byte tags */
+	int no_tags_ecc;	/* Flag to decide whether or not to do ECC
+				 * on packed tags (yaffs2) */
+
+	int is_yaffs2;		/* Use yaffs2 mode on this device */
+
+	int empty_lost_n_found;	/* Auto-empty lost+found directory on mount */
+
+	int refresh_period;	/* How often to check for a block refresh */
+
+	/* Checkpoint control. Can be set before or after initialisation */
+	u8 skip_checkpt_rd;
+	u8 skip_checkpt_wr;
+
+	int enable_xattr;	/* Enable xattribs */
+
+	int max_objects;	/*
+				 * Set to limit the number of objects created.
+				 * 0 = no limit.
+				*/
+
+	/* The remove_obj_fn function must be supplied by OS flavours that
+	 * need it.
+	 * yaffs direct uses it to implement the faster readdir.
+	 * Linux uses it to protect the directory during unlocking.
+	 */
+	void (*remove_obj_fn) (struct yaffs_obj *obj);
+
+	/* Callback to mark the superblock dirty */
+	void (*sb_dirty_fn) (struct yaffs_dev *dev);
+
+	/*  Callback to control garbage collection. */
+	unsigned (*gc_control_fn) (struct yaffs_dev *dev);
+
+	/* Debug control flags. Don't use unless you know what you're doing */
+	int use_header_file_size;	/* Flag to determine if we should use
+					 * file sizes from the header */
+	int disable_lazy_load;	/* Disable lazy loading on this device */
+	int wide_tnodes_disabled;	/* Set to disable wide tnodes */
+	int disable_soft_del;	/* yaffs 1 only: Set to disable the use of
+				 * softdeletion. */
+
+	int defered_dir_update;	/* Set to defer directory updates */
+
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	int auto_unicode;
+#endif
+	int always_check_erased;	/* Force chunk erased check always on */
+
+	int disable_summary;
+	int disable_bad_block_marking;
+
+};
+
+struct yaffs_driver {
+	int (*drv_write_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
+				   const u8 *data, int data_len,
+				   const u8 *oob, int oob_len);
+	int (*drv_read_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
+				   u8 *data, int data_len,
+				   u8 *oob, int oob_len,
+				   enum yaffs_ecc_result *ecc_result);
+	int (*drv_erase_fn) (struct yaffs_dev *dev, int block_no);
+	int (*drv_mark_bad_fn) (struct yaffs_dev *dev, int block_no);
+	int (*drv_check_bad_fn) (struct yaffs_dev *dev, int block_no);
+	int (*drv_initialise_fn) (struct yaffs_dev *dev);
+	int (*drv_deinitialise_fn) (struct yaffs_dev *dev);
+};
+
+struct yaffs_tags_handler {
+	int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
+				    int nand_chunk, const u8 *data,
+				    const struct yaffs_ext_tags *tags);
+	int (*read_chunk_tags_fn) (struct yaffs_dev *dev,
+				   int nand_chunk, u8 *data,
+				   struct yaffs_ext_tags *tags);
+
+	int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
+			       enum yaffs_block_state *state,
+			       u32 *seq_number);
+	int (*mark_bad_fn) (struct yaffs_dev *dev, int block_no);
+};
+
+struct yaffs_dev {
+	struct yaffs_param param;
+	struct yaffs_driver drv;
+	struct yaffs_tags_handler tagger;
+
+	/* Context storage. Holds extra OS specific data for this device */
+
+	void *os_context;
+	void *driver_context;
+
+	struct list_head dev_list;
+
+	int ll_init;
+	/* Runtime parameters. Set up by YAFFS. */
+	int data_bytes_per_chunk;
+
+	/* Non-wide tnode stuff */
+	u16 chunk_grp_bits;	/* Number of bits that need to be resolved if
+				 * the tnodes are not wide enough.
+				 */
+	u16 chunk_grp_size;	/* == 2^^chunk_grp_bits */
+
+	/* Stuff to support wide tnodes */
+	u32 tnode_width;
+	u32 tnode_mask;
+	u32 tnode_size;
+
+	/* Stuff for figuring out file offset to chunk conversions */
+	u32 chunk_shift;	/* Shift value */
+	u32 chunk_div;		/* Divisor after shifting: 1 for 2^n sizes */
+	u32 chunk_mask;		/* Mask to use for power-of-2 case */
+
+	int is_mounted;
+	int read_only;
+	int is_checkpointed;
+
+	/* Stuff to support block offsetting to support start block zero */
+	int internal_start_block;
+	int internal_end_block;
+	int block_offset;
+	int chunk_offset;
+
+	/* Runtime checkpointing stuff */
+	int checkpt_page_seq;	/* running sequence number of checkpt pages */
+	int checkpt_byte_count;
+	int checkpt_byte_offs;
+	u8 *checkpt_buffer;
+	int checkpt_open_write;
+	int blocks_in_checkpt;
+	int checkpt_cur_chunk;
+	int checkpt_cur_block;
+	int checkpt_next_block;
+	int *checkpt_block_list;
+	int checkpt_max_blocks;
+	u32 checkpt_sum;
+	u32 checkpt_xor;
+
+	int checkpoint_blocks_required;	/* Number of blocks needed to store
+					 * current checkpoint set */
+
+	/* Block Info */
+	struct yaffs_block_info *block_info;
+	u8 *chunk_bits;		/* bitmap of chunks in use */
+	u8 block_info_alt:1;	/* allocated using alternative alloc */
+	u8 chunk_bits_alt:1;	/* allocated using alternative alloc */
+	int chunk_bit_stride;	/* Number of bytes of chunk_bits per block.
+				 * Must be consistent with chunks_per_block.
+				 */
+
+	int n_erased_blocks;
+	int alloc_block;	/* Current block being allocated off */
+	u32 alloc_page;
+	int alloc_block_finder;	/* Used to search for next allocation block */
+
+	/* Object and Tnode memory management */
+	void *allocator;
+	int n_obj;
+	int n_tnodes;
+
+	int n_hardlinks;
+
+	struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
+	u32 bucket_finder;
+
+	int n_free_chunks;
+
+	/* Garbage collection control */
+	u32 *gc_cleanup_list;	/* objects to delete at the end of a GC. */
+	u32 n_clean_ups;
+
+	unsigned has_pending_prioritised_gc;	/* We think this device might
+						have pending prioritised gcs */
+	unsigned gc_disable;
+	unsigned gc_block_finder;
+	unsigned gc_dirtiest;
+	unsigned gc_pages_in_use;
+	unsigned gc_not_done;
+	unsigned gc_block;
+	unsigned gc_chunk;
+	unsigned gc_skip;
+	struct yaffs_summary_tags *gc_sum_tags;
+
+	/* Special directories */
+	struct yaffs_obj *root_dir;
+	struct yaffs_obj *lost_n_found;
+
+	int buffered_block;	/* Which block is buffered here? */
+	int doing_buffered_block_rewrite;
+
+	struct yaffs_cache *cache;
+	int cache_last_use;
+
+	/* Stuff for background deletion and unlinked files. */
+	struct yaffs_obj *unlinked_dir;	/* Directory where unlinked and deleted
+					 files live. */
+	struct yaffs_obj *del_dir;	/* Directory where deleted objects are
+					sent to disappear. */
+	struct yaffs_obj *unlinked_deletion;	/* Current file being
+							background deleted. */
+	int n_deleted_files;	/* Count of files awaiting deletion; */
+	int n_unlinked_files;	/* Count of unlinked files. */
+	int n_bg_deletions;	/* Count of background deletions. */
+
+	/* Temporary buffer management */
+	struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
+	int max_temp;
+	int temp_in_use;
+	int unmanaged_buffer_allocs;
+	int unmanaged_buffer_deallocs;
+
+	/* yaffs2 runtime stuff */
+	unsigned seq_number;	/* Sequence number of currently
+					allocating block */
+	unsigned oldest_dirty_seq;
+	unsigned oldest_dirty_block;
+
+	/* Block refreshing */
+	int refresh_skip;	/* A skip down counter.
+				 * Refresh happens when this gets to zero. */
+
+	/* Dirty directory handling */
+	struct list_head dirty_dirs;	/* List of dirty directories */
+
+	/* Summary */
+	int chunks_per_summary;
+	struct yaffs_summary_tags *sum_tags;
+
+	/* Statistics */
+	u32 n_page_writes;
+	u32 n_page_reads;
+	u32 n_erasures;
+	u32 n_bad_queries;
+	u32 n_bad_markings;
+	u32 n_erase_failures;
+	u32 n_gc_copies;
+	u32 all_gcs;
+	u32 passive_gc_count;
+	u32 oldest_dirty_gc_count;
+	u32 n_gc_blocks;
+	u32 bg_gcs;
+	u32 n_retried_writes;
+	u32 n_retired_blocks;
+	u32 n_ecc_fixed;
+	u32 n_ecc_unfixed;
+	u32 n_tags_ecc_fixed;
+	u32 n_tags_ecc_unfixed;
+	u32 n_deletions;
+	u32 n_unmarked_deletions;
+	u32 refresh_count;
+	u32 cache_hits;
+	u32 tags_used;
+	u32 summary_used;
+
+};
+
+/* The CheckpointDevice structure holds the device information that changes
+ *at runtime and must be preserved over unmount/mount cycles.
+ */
+struct yaffs_checkpt_dev {
+	int struct_type;
+	int n_erased_blocks;
+	int alloc_block;	/* Current block being allocated off */
+	u32 alloc_page;
+	int n_free_chunks;
+
+	int n_deleted_files;	/* Count of files awaiting deletion; */
+	int n_unlinked_files;	/* Count of unlinked files. */
+	int n_bg_deletions;	/* Count of background deletions. */
+
+	/* yaffs2 runtime stuff */
+	unsigned seq_number;	/* Sequence number of currently
+				 * allocating block */
+
+};
+
+struct yaffs_checkpt_validity {
+	int struct_type;
+	u32 magic;
+	u32 version;
+	u32 head;
+};
+
+struct yaffs_shadow_fixer {
+	int obj_id;
+	int shadowed_id;
+	struct yaffs_shadow_fixer *next;
+};
+
+/* Structure for doing xattr modifications */
+struct yaffs_xattr_mod {
+	int set;		/* If 0 then this is a deletion */
+	const YCHAR *name;
+	const void *data;
+	int size;
+	int flags;
+	int result;
+};
+
+/*----------------------- YAFFS Functions -----------------------*/
+
+int yaffs_guts_initialise(struct yaffs_dev *dev);
+void yaffs_deinitialise(struct yaffs_dev *dev);
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+		     struct yaffs_obj *new_dir, const YCHAR * new_name);
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
+int yaffs_del_obj(struct yaffs_obj *obj);
+struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
+				   enum yaffs_obj_type type);
+
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
+Y_LOFF_T yaffs_get_obj_length(struct yaffs_obj *obj);
+int yaffs_get_obj_inode(struct yaffs_obj *obj);
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
+int yaffs_get_obj_link_count(struct yaffs_obj *obj);
+
+/* File operations */
+int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, Y_LOFF_T offset,
+		  int n_bytes);
+int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, Y_LOFF_T offset,
+		  int n_bytes, int write_trhrough);
+int yaffs_resize_file(struct yaffs_obj *obj, Y_LOFF_T new_size);
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+				    const YCHAR *name, u32 mode, u32 uid,
+				    u32 gid);
+
+int yaffs_flush_file(struct yaffs_obj *in,
+		     int update_time,
+		     int data_sync,
+		     int discard_cache);
+
+/* Flushing and checkpointing */
+void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard);
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev);
+int yaffs_checkpoint_restore(struct yaffs_dev *dev);
+
+/* Directory operations */
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
+				   u32 mode, u32 uid, u32 gid);
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
+				     const YCHAR *name);
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
+
+/* Link operations */
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name,
+				 struct yaffs_obj *equiv_obj);
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
+
+/* Symlink operations */
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, const YCHAR *alias);
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
+
+/* Special inodes (fifos, sockets and devices) */
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, u32 rdev);
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name,
+		      const void *value, int size, int flags);
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value,
+		      int size);
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name);
+
+/* Special directories */
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj);
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
+
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
+
+/* Debug dump  */
+int yaffs_dump_obj(struct yaffs_obj *obj);
+
+void yaffs_guts_test(struct yaffs_dev *dev);
+int yaffs_guts_ll_init(struct yaffs_dev *dev);
+
+
+/* A few useful functions to be used within the core files*/
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+		     int lyn);
+int yaffs_check_ff(u8 *buffer, int n_bytes);
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+			      struct yaffs_block_info *bi);
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev);
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer);
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+						 int number,
+						 enum yaffs_obj_type type);
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+			    int nand_chunk, int in_scan);
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name);
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+				const struct yaffs_obj_hdr *oh);
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
+YCHAR *yaffs_clone_str(const YCHAR *str);
+void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list);
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name,
+		    int force, int is_shrink, int shadows,
+		    struct yaffs_xattr_mod *xop);
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+			       int backward_scanning);
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+					   struct yaffs_file_var *file_struct,
+					   u32 chunk_id,
+					   struct yaffs_tnode *passed_tn);
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, Y_LOFF_T offset,
+		     int n_bytes, int write_trhrough);
+void yaffs_resize_file_down(struct yaffs_obj *obj, Y_LOFF_T new_size);
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+				       struct yaffs_file_var *file_struct,
+				       u32 chunk_id);
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			 unsigned pos);
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
+
+int yaffs_guts_format_dev(struct yaffs_dev *dev);
+
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, Y_LOFF_T addr,
+				int *chunk_out, u32 *offset_out);
+/*
+ * Marshalling functions to get Y_LOFF_T file sizes into aand out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, Y_LOFF_T fsize);
+Y_LOFF_T yaffs_oh_to_size(struct yaffs_obj_hdr *oh);
+Y_LOFF_T yaffs_max_file_size(struct yaffs_dev *dev);
+
+/*
+ * Debug function to count number of blocks in each state
+ * NB Needs to be called with correct number of integers
+ */
+
+void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]);
+
+int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+				    struct yaffs_ext_tags *tags);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_hweight.h

@@ -0,0 +1,24 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_HWEIGHT_H__
+#define __YAFFS_HWEIGHT_H__
+
+#include "yportenv.h"
+
+int yaffs_hweight8(u8 x);
+int yaffs_hweight32(u32 x);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_list.h

@@ -0,0 +1,126 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This file is just holds extra declarations of macros that would normally
+ * be providesd in the Linux kernel. These macros have been written from
+ * scratch but are functionally equivalent to the Linux ones.
+ *
+ */
+
+#ifndef __YAFFS_LIST_H__
+#define __YAFFS_LIST_H__
+
+
+/*
+ * This is a simple doubly linked list implementation that matches the
+ * way the Linux kernel doubly linked list implementation works.
+ */
+
+struct list_head {
+	struct list_head *next; /* next in chain */
+	struct list_head *prev; /* previous in chain */
+};
+
+
+/* Initialise a static list */
+#define LIST_HEAD(name) \
+struct list_head name = { &(name), &(name)}
+
+
+
+/* Initialise a list head to an empty list */
+#define INIT_LIST_HEAD(p) \
+do { \
+	(p)->next = (p);\
+	(p)->prev = (p); \
+} while (0)
+
+
+/* Add an element to a list */
+static inline void list_add(struct list_head *new_entry,
+				struct list_head *list)
+{
+	struct list_head *list_next = list->next;
+
+	list->next = new_entry;
+	new_entry->prev = list;
+	new_entry->next = list_next;
+	list_next->prev = new_entry;
+
+}
+
+static inline void list_add_tail(struct list_head *new_entry,
+				 struct list_head *list)
+{
+	struct list_head *list_prev = list->prev;
+
+	list->prev = new_entry;
+	new_entry->next = list;
+	new_entry->prev = list_prev;
+	list_prev->next = new_entry;
+
+}
+
+
+/* Take an element out of its current list, with or without
+ * reinitialising the links.of the entry*/
+static inline void list_del(struct list_head *entry)
+{
+	struct list_head *list_next = entry->next;
+	struct list_head *list_prev = entry->prev;
+
+	list_next->prev = list_prev;
+	list_prev->next = list_next;
+
+}
+
+static inline void list_del_init(struct list_head *entry)
+{
+	list_del(entry);
+	entry->next = entry->prev = entry;
+}
+
+
+/* Test if the list is empty */
+static inline int list_empty(struct list_head *entry)
+{
+	return (entry->next == entry);
+}
+
+
+/* list_entry takes a pointer to a list entry and offsets it to that
+ * we can find a pointer to the object it is embedded in.
+ */
+
+
+#define list_entry(entry, type, member) \
+	((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
+
+
+/* list_for_each and list_for_each_safe  iterate over lists.
+ * list_for_each_safe uses temporary storage to make the list delete safe
+ */
+
+#define list_for_each(itervar, list) \
+	for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
+
+#define list_for_each_safe(itervar, save_var, list) \
+	for (itervar = (list)->next, save_var = (list)->next->next; \
+		itervar != (list); \
+		itervar = save_var, save_var = save_var->next)
+
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_nameval.h

@@ -0,0 +1,28 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+int nval_del(char *xb, int xb_size, const YCHAR * name);
+int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf,
+	     int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+	     int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_nand.h

@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_NAND_H__
+#define __YAFFS_NAND_H__
+#include "yaffs_guts.h"
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+			     u8 *buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+			     int nand_chunk,
+			     const u8 *buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no);
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+				 int block_no,
+				 enum yaffs_block_state *state,
+				 unsigned *seq_number);
+
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block);
+
+int yaffs_init_nand(struct yaffs_dev *dev);
+int yaffs_deinit_nand(struct yaffs_dev *dev);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_osglue.h

@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Header file for using yaffs in an application via
+ * a direct interface.
+ */
+
+
+#ifndef __YAFFS_OSGLUE_H__
+#define __YAFFS_OSGLUE_H__
+
+
+#include "yportenv.h"
+
+void yaffsfs_Lock(void);
+void yaffsfs_Unlock(void);
+
+u32 yaffsfs_CurrentTime(void);
+
+void yaffsfs_SetError(int err);
+
+void *yaffsfs_malloc(size_t size);
+void yaffsfs_free(void *ptr);
+
+int yaffsfs_CheckMemRegion(const void *addr, size_t size, int write_request);
+
+void yaffsfs_OSInitialisation(void);
+
+
+#endif
+

flight/pios/common/libraries/yaffs2/inc/yaffs_packedtags2.h

@@ -0,0 +1,47 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* This is used to pack YAFFS2 tags, not YAFFS1tags. */
+
+#ifndef __YAFFS_PACKEDTAGS2_H__
+#define __YAFFS_PACKEDTAGS2_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_ecc.h"
+
+struct yaffs_packed_tags2_tags_only {
+	unsigned seq_number;
+	unsigned obj_id;
+	unsigned chunk_id;
+	unsigned n_bytes;
+};
+
+struct yaffs_packed_tags2 {
+	struct yaffs_packed_tags2_tags_only t;
+	struct yaffs_ecc_other ecc;
+};
+
+/* Full packed tags with ECC, used for oob tags */
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+		      const struct yaffs_ext_tags *t, int tags_ecc);
+void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+			int tags_ecc);
+
+/* Only the tags part (no ECC for use with inband tags */
+void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt,
+				const struct yaffs_ext_tags *t);
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+				  struct yaffs_packed_tags2_tags_only *pt);
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_summary.h

@@ -0,0 +1,37 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_SUMMARY_H__
+#define __YAFFS_SUMMARY_H__
+
+#include "yaffs_packedtags2.h"
+
+
+int yaffs_summary_init(struct yaffs_dev *dev);
+void yaffs_summary_deinit(struct yaffs_dev *dev);
+
+int yaffs_summary_add(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block);
+int yaffs_summary_fetch(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block);
+int yaffs_summary_read(struct yaffs_dev *dev,
+			struct yaffs_summary_tags *st,
+			int blk);
+void yaffs_summary_gc(struct yaffs_dev *dev, int blk);
+
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_tagscompat.h

@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_TAGSCOMPAT_H__
+#define __YAFFS_TAGSCOMPAT_H__
+
+
+#include "yaffs_guts.h"
+
+#if 0
+
+
+int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 const u8 *data, const struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 u8 *data, struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no);
+int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+				  int block_no,
+				  enum yaffs_block_state *state,
+				  u32 *seq_number);
+
+#endif
+
+
+void yaffs_tags_compat_install(struct yaffs_dev *dev);
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags);
+int yaffs_check_tags_ecc(struct yaffs_tags *tags);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_tagsmarshall.h

@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_TAGSMARSHALL_H__
+#define __YAFFS_TAGSMARSHALL_H__
+
+#include "yaffs_guts.h"
+void yaffs_tags_marshall_install(struct yaffs_dev *dev);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_trace.h

@@ -0,0 +1,57 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YTRACE_H__
+#define __YTRACE_H__
+
+extern unsigned int yaffs_trace_mask;
+extern unsigned int yaffs_wr_attempts;
+
+/*
+ * Tracing flags.
+ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
+ */
+
+#define YAFFS_TRACE_OS			0x00000002
+#define YAFFS_TRACE_ALLOCATE		0x00000004
+#define YAFFS_TRACE_SCAN		0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
+#define YAFFS_TRACE_ERASE		0x00000020
+#define YAFFS_TRACE_GC			0x00000040
+#define YAFFS_TRACE_WRITE		0x00000080
+#define YAFFS_TRACE_TRACING		0x00000100
+#define YAFFS_TRACE_DELETION		0x00000200
+#define YAFFS_TRACE_BUFFERS		0x00000400
+#define YAFFS_TRACE_NANDACCESS		0x00000800
+#define YAFFS_TRACE_GC_DETAIL		0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
+#define YAFFS_TRACE_MTD			0x00004000
+#define YAFFS_TRACE_CHECKPOINT		0x00008000
+
+#define YAFFS_TRACE_VERIFY		0x00010000
+#define YAFFS_TRACE_VERIFY_NAND		0x00020000
+#define YAFFS_TRACE_VERIFY_FULL		0x00040000
+#define YAFFS_TRACE_VERIFY_ALL		0x000f0000
+
+#define YAFFS_TRACE_SYNC		0x00100000
+#define YAFFS_TRACE_BACKGROUND		0x00200000
+#define YAFFS_TRACE_LOCK		0x00400000
+#define YAFFS_TRACE_MOUNT		0x00800000
+
+#define YAFFS_TRACE_ERROR		0x40000000
+#define YAFFS_TRACE_BUG			0x80000000
+#define YAFFS_TRACE_ALWAYS		0xf0000000
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_verify.h

@@ -0,0 +1,43 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_VERIFY_H__
+#define __YAFFS_VERIFY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi,
+		      int n);
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+				struct yaffs_block_info *bi, int n);
+void yaffs_verify_blocks(struct yaffs_dev *dev);
+
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+		     struct yaffs_ext_tags *tags, int parent_check);
+void yaffs_verify_file(struct yaffs_obj *obj);
+void yaffs_verify_link(struct yaffs_obj *obj);
+void yaffs_verify_symlink(struct yaffs_obj *obj);
+void yaffs_verify_special(struct yaffs_obj *obj);
+void yaffs_verify_obj(struct yaffs_obj *obj);
+void yaffs_verify_objects(struct yaffs_dev *dev);
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj);
+void yaffs_verify_dir(struct yaffs_obj *directory);
+void yaffs_verify_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_verify_file_sane(struct yaffs_obj *obj);
+
+int yaffs_skip_verification(struct yaffs_dev *dev);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_yaffs1.h

@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
+
+#include "yaffs_guts.h"
+int yaffs1_scan(struct yaffs_dev *dev);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffs_yaffs2.h

@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+				   struct yaffs_block_info *bi);
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+				    struct yaffs_block_info *bi);
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi);
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev);
+int yaffs2_checkpt_required(struct yaffs_dev *dev);
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev);
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev);
+int yaffs2_checkpt_save(struct yaffs_dev *dev);
+int yaffs2_checkpt_restore(struct yaffs_dev *dev);
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, Y_LOFF_T new_size);
+int yaffs2_scan_backwards(struct yaffs_dev *dev);
+
+#endif

flight/pios/common/libraries/yaffs2/inc/yaffscfg.h

@@ -0,0 +1,40 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Header file for using yaffs in an application via
+ * a direct interface.
+ */
+
+
+#ifndef __YAFFSCFG_H__
+#define __YAFFSCFG_H__
+
+
+#include "yportenv.h"
+
+#define YAFFSFS_N_HANDLES	100
+
+#define YAFFSFS_N_DSC		20
+
+
+struct yaffsfs_DeviceConfiguration {
+	const YCHAR *prefix;
+	struct yaffs_dev *dev;
+};
+
+
+#endif
+

flight/pios/common/libraries/yaffs2/inc/yaffsfs.h

@@ -0,0 +1,334 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Header file for using yaffs in an application via
+ * a direct interface.
+ */
+
+
+#ifndef __YAFFSFS_H__
+#define __YAFFSFS_H__
+
+#include "yaffscfg.h"
+#include "yportenv.h"
+
+
+#ifndef NAME_MAX
+#define NAME_MAX	256
+#endif
+
+#ifdef CONFIG_YAFFS_OP
+#define YAFFS_MAX_FILE_SIZE (Y_LOFF_T)16000000
+#else
+#define YAFFS_MAX_FILE_SIZE \
+	( (sizeof(Y_LOFF_T) < 8) ? YAFFS_MAX_FILE_SIZE_32 : (0x800000000LL - 1) )
+#endif
+
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+struct yaffs_dirent {
+	long d_ino;			/* inode number */
+	off_t d_off;			/* offset to this dirent */
+	unsigned short d_reclen;	/* length of this dirent */
+	YUCHAR d_type;			/* type of this record */
+	YCHAR d_name[NAME_MAX+1];	/* file name (null-terminated) */
+	unsigned d_dont_use;		/* debug: not for public consumption */
+};
+
+typedef struct opaque_structure yaffs_DIR;
+
+
+
+struct yaffs_stat {
+	int		st_dev;		/* device */
+	int		st_ino;		/* inode */
+	unsigned	st_mode;	/* protection */
+	int		st_nlink;	/* number of hard links */
+	int		st_uid;		/* user ID of owner */
+	int		st_gid;		/* group ID of owner */
+	unsigned	st_rdev;	/* device type (if inode device) */
+	Y_LOFF_T		st_size;	/* total size, in bytes */
+	unsigned long	st_blksize;	/* blocksize for filesystem I/O */
+	unsigned long	st_blocks;	/* number of blocks allocated */
+#ifdef CONFIG_YAFFS_WINCE
+	/* Special 64-bit times for WinCE */
+	unsigned long	yst_wince_atime[2];
+	unsigned long	yst_wince_mtime[2];
+	unsigned long	yst_wince_ctime[2];
+#else
+	unsigned long	yst_atime;	/* time of last access */
+	unsigned long	yst_mtime;	/* time of last modification */
+	unsigned long	yst_ctime;	/* time of last change */
+#endif
+};
+
+
+struct yaffs_utimbuf {
+	unsigned long actime;
+	unsigned long modtime;
+};
+
+/* Normal POSIX-style API functions */
+
+int yaffs_open(const YCHAR *path, int oflag, int mode) ;
+
+int yaffs_close(int fd) ;
+int yaffs_fsync(int fd) ;
+int yaffs_fdatasync(int fd) ;
+int yaffs_flush(int fd) ; /* same as yaffs_fsync() */
+
+int yaffs_access(const YCHAR *path, int amode);
+
+int yaffs_dup(int fd);
+
+int yaffs_read(int fd, void *buf, unsigned int nbyte) ;
+int yaffs_write(int fd, const void *buf, unsigned int nbyte) ;
+
+int yaffs_pread(int fd, void *buf, unsigned int nbyte, Y_LOFF_T offset);
+int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, Y_LOFF_T offset);
+
+Y_LOFF_T yaffs_lseek(int fd, Y_LOFF_T offset, int whence) ;
+
+int yaffs_truncate(const YCHAR *path, Y_LOFF_T new_size);
+int yaffs_ftruncate(int fd, Y_LOFF_T new_size);
+
+int yaffs_unlink(const YCHAR *path) ;
+int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath) ;
+
+int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf) ;
+int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf) ;
+int yaffs_fstat(int fd, struct yaffs_stat *buf) ;
+
+int yaffs_utime(const YCHAR *path, const struct yaffs_utimbuf *buf);
+int yaffs_futime(int fd, const struct yaffs_utimbuf *buf);
+
+
+int yaffs_setxattr(const char *path, const char *name,
+			const void *data, int size, int flags);
+int yaffs_lsetxattr(const char *path, const char *name,
+			const void *data, int size, int flags);
+int yaffs_fsetxattr(int fd, const char *name,
+			const void *data, int size, int flags);
+
+int yaffs_getxattr(const char *path, const char *name,
+			void *data, int size);
+int yaffs_lgetxattr(const char *path, const char *name,
+			void *data, int size);
+int yaffs_fgetxattr(int fd, const char *name,
+			void *data, int size);
+
+int yaffs_removexattr(const char *path, const char *name);
+int yaffs_lremovexattr(const char *path, const char *name);
+int yaffs_fremovexattr(int fd, const char *name);
+
+int yaffs_listxattr(const char *path, char *list, int size);
+int yaffs_llistxattr(const char *path, char *list, int size);
+int yaffs_flistxattr(int fd, char *list, int size);
+
+int yaffs_chmod(const YCHAR *path, mode_t mode);
+int yaffs_fchmod(int fd, mode_t mode);
+
+int yaffs_mkdir(const YCHAR *path, mode_t mode) ;
+int yaffs_rmdir(const YCHAR *path) ;
+
+yaffs_DIR *yaffs_opendir(const YCHAR *dirname) ;
+struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp) ;
+void yaffs_rewinddir(yaffs_DIR *dirp) ;
+int yaffs_closedir(yaffs_DIR *dirp) ;
+
+int yaffs_mount(const YCHAR *path) ;
+int yaffs_mount2(const YCHAR *path, int read_only);
+int yaffs_mount3(const YCHAR *path, int read_only, int skip_checkpt);
+
+int yaffs_unmount(const YCHAR *path) ;
+int yaffs_unmount2(const YCHAR *path, int force);
+int yaffs_remount(const YCHAR *path, int force, int read_only);
+
+int yaffs_format(const YCHAR *path,
+		int unmount_flag,
+		int force_unmount_flag,
+		int remount_flag);
+
+int yaffs_sync(const YCHAR *path) ;
+
+int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath);
+int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz);
+
+int yaffs_link(const YCHAR *oldpath, const YCHAR *newpath);
+int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev);
+
+Y_LOFF_T yaffs_freespace(const YCHAR *path);
+Y_LOFF_T yaffs_totalspace(const YCHAR *path);
+
+/* Function variants that use a relative directory */
+struct yaffs_obj;
+int yaffs_open_sharing_reldir(struct yaffs_obj *reldir, const YCHAR *path, int oflag, int mode, int sharing);
+int yaffs_open_reldir(struct yaffs_obj *reldir,const YCHAR *path, int oflag, int mode);
+int yaffs_truncate_reldir(struct yaffs_obj *reldir, const YCHAR *path, Y_LOFF_T new_size);
+int yaffs_unlink_reldir(struct yaffs_obj *reldir, const YCHAR *path);
+int yaffs_rename_reldir(struct yaffs_obj *reldir,
+			const YCHAR *oldPath, const YCHAR *newPath);
+int yaffs_stat_reldir(struct yaffs_obj *reldir, const YCHAR *path, struct yaffs_stat *buf);
+int yaffs_lstat_reldir(struct yaffs_obj *reldir, const YCHAR *path, struct yaffs_stat *buf);
+int yaffs_utime_reldir(struct yaffs_obj *reldir, const YCHAR *path, const struct yaffs_utimbuf *buf);
+int yaffs_setxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, const void *data, int size, int flags);
+int yaffs_lsetxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, const void *data, int size, int flags);
+int yaffs_getxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, void *data, int size);
+int yaffs_lgetxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, void *data, int size);
+int yaffs_listxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			char *data, int size);
+int yaffs_llistxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			char *data, int size);
+int yaffs_removexattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name);
+int yaffs_lremovexattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name);
+int yaffs_access_reldir(struct yaffs_obj *reldir, const YCHAR *path, int amode);
+int yaffs_chmod_reldir(struct yaffs_obj *reldir, const YCHAR *path, mode_t mode);
+int yaffs_mkdir_reldir(struct yaffs_obj *reldir, const YCHAR *path, mode_t mode);
+int yaffs_rmdir_reldir(struct yaffs_obj *reldir, const YCHAR *path);
+yaffs_DIR *yaffs_opendir_reldir(struct yaffs_obj *reldir, const YCHAR *dirname);
+int yaffs_symlink_reldir(struct yaffs_obj *reldir,
+			const YCHAR *oldpath, const YCHAR *newpath);
+int yaffs_readlink_reldir(struct yaffs_obj *reldir,const YCHAR *path,
+			YCHAR *buf, int bufsiz);
+int yaffs_link_reldir(struct yaffs_obj *reldir,
+			const YCHAR *oldpath, const YCHAR *linkpath);
+int yaffs_mknod_reldir(struct yaffs_obj *reldir, const YCHAR *pathname,
+		     mode_t mode, dev_t dev);
+
+/* Function variants that use a relative device */
+struct yaffs_dev;
+int yaffs_open_sharing_reldev(struct yaffs_dev *dev, const YCHAR *path, int oflag, int mode, int sharing);
+int yaffs_open_reldev(struct yaffs_dev *dev,const YCHAR *path, int oflag, int mode);
+int yaffs_truncate_reldev(struct yaffs_dev *dev, const YCHAR *path, Y_LOFF_T new_size);
+int yaffs_unlink_reldev(struct yaffs_dev *dev, const YCHAR *path);
+int yaffs_rename_reldev(struct yaffs_dev *dev,
+			const YCHAR *oldPath, const YCHAR *newPath);
+int yaffs_stat_reldev(struct yaffs_dev *dev, const YCHAR *path, struct yaffs_stat *buf);
+int yaffs_lstat_reldev(struct yaffs_dev *dev, const YCHAR *path, struct yaffs_stat *buf);
+int yaffs_utime_reldev(struct yaffs_dev *dev, const YCHAR *path, const struct yaffs_utimbuf *buf);
+int yaffs_setxattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			const char *name, const void *data, int size, int flags);
+int yaffs_lsetxattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			const char *name, const void *data, int size, int flags);
+int yaffs_getxattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			const char *name, void *data, int size);
+int yaffs_lgetxattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			const char *name, void *data, int size);
+int yaffs_listxattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			char *data, int size);
+int yaffs_llistxattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			char *data, int size);
+int yaffs_removexattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			const char *name);
+int yaffs_lremovexattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			const char *name);
+int yaffs_access_reldev(struct yaffs_dev *dev, const YCHAR *path, int amode);
+int yaffs_chmod_reldev(struct yaffs_dev *dev, const YCHAR *path, mode_t mode);
+int yaffs_mkdir_reldev(struct yaffs_dev *dev, const YCHAR *path, mode_t mode);
+int yaffs_rmdir_reldev(struct yaffs_dev *dev, const YCHAR *path);
+yaffs_DIR *yaffs_opendir_reldev(struct yaffs_dev *dev, const YCHAR *dirname);
+int yaffs_symlink_reldev(struct yaffs_dev *dev,
+			const YCHAR *oldpath, const YCHAR *newpath);
+int yaffs_readlink_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			YCHAR *buf, int bufsiz);
+int yaffs_link_reldev(struct yaffs_dev *dev,
+			const YCHAR *oldpath, const YCHAR *linkpath);
+int yaffs_mknod_reldev(struct yaffs_dev *dev, const YCHAR *pathname,
+		     mode_t mode, dev_t dev_val);
+Y_LOFF_T yaffs_freespace_reldev(struct yaffs_dev *dev);
+Y_LOFF_T yaffs_totalspace_reldev(struct yaffs_dev *dev);
+
+int yaffs_sync_reldev(struct yaffs_dev *dev);
+int yaffs_unmount_reldev(struct yaffs_dev *dev);
+int yaffs_unmount2_reldev(struct yaffs_dev *dev, int force);
+int yaffs_remount_reldev(struct yaffs_dev *dev, int force, int read_only);
+
+
+/* Some non-standard functions to use fds to access directories */
+struct yaffs_dirent *yaffs_readdir_fd(int fd);
+void yaffs_rewinddir_fd(int fd);
+
+/* Non-standard functions to pump garbage collection. */
+int yaffs_do_background_gc(const YCHAR *path, int urgency);
+int yaffs_do_background_gc_reldev(struct yaffs_dev *dev, int urgency);
+
+/* Non-standard functions to get usage info */
+int yaffs_inodecount(const YCHAR *path);
+
+int yaffs_n_handles(const YCHAR *path);
+
+int yaffs_n_handles_reldir(struct yaffs_obj *reldir, const YCHAR *path);
+int yaffs_dump_dev_reldir(struct yaffs_obj *reldir, const YCHAR *path);
+int yaffs_n_handles_reldev(struct yaffs_dev *dev, const YCHAR *path);
+int yaffs_dump_dev_reldev(struct yaffs_dev *dev, const YCHAR *path);
+
+#ifdef CONFIG_YAFFS_WINCE
+int yaffs_set_wince_times(int fd,
+			const unsigned *wctime,
+			const unsigned *watime,
+			const unsigned *wmtime);
+int yaffs_get_wince_times(int fd,
+			unsigned *wctime,
+			unsigned *watime,
+			unsigned *wmtime);
+#endif
+
+
+#define YAFFS_SHARE_READ  1
+#define YAFFS_SHARE_WRITE 2
+int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int shareMode);
+
+struct yaffs_dev;
+void yaffs_add_device(struct yaffs_dev *dev);
+
+int yaffs_start_up(void);
+int yaffsfs_GetLastError(void);
+
+/* Functions to iterate through devices. NB Use with extreme care! */
+void yaffs_dev_rewind(void);
+struct yaffs_dev *yaffs_next_dev(void);
+
+/* Function to get the last error */
+int yaffs_get_error(void);
+const char *yaffs_error_to_str(int err);
+
+/* Function only for debugging */
+void *yaffs_getdev(const YCHAR *path);
+int yaffs_dump_dev(const YCHAR *path);
+int yaffs_set_error(int error);
+
+/* Trace control functions */
+unsigned  yaffs_set_trace(unsigned tm);
+unsigned  yaffs_get_trace(void);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif

flight/pios/common/libraries/yaffs2/inc/ydirectenv.h

@@ -0,0 +1,101 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * ydirectenv.h: Environment wrappers for YAFFS direct.
+ */
+
+#ifndef __YDIRECTENV_H__
+#define __YDIRECTENV_H__
+
+#include "stdint.h"
+#include "stdlib.h"
+#include "stdio.h"
+#include "string.h"
+#include "yaffs_osglue.h"
+#include "yaffs_hweight.h"
+
+void yaffs_bug_fn(const char *file_name, int line_no);
+
+#define BUG() do { yaffs_bug_fn(__FILE__, __LINE__); } while (0)
+
+
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x) x
+
+#ifndef Y_LOFF_T
+#define Y_LOFF_T int32_t  // note CONFIG_YAFFS_OP changes dependent on type for max file size
+#endif
+
+#define yaffs_strcat(a, b)	strcat(a, b)
+#define yaffs_strcpy(a, b)	strcpy(a, b)
+#define yaffs_strncpy(a, b, c)	strncpy(a, b, c)
+#define yaffs_strnlen(s, m)	strnlen(s, m)
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+#define yaffs_strcmp(a, b)	strcasecmp(a, b)
+#define yaffs_strncmp(a, b, c)	strncasecmp(a, b, c)
+#else
+#define yaffs_strcmp(a, b)	strcmp(a, b)
+#define yaffs_strncmp(a, b, c)	strncmp(a, b, c)
+#endif
+
+#define hweight8(x)	yaffs_hweight8(x)
+#define hweight32(x)	yaffs_hweight32(x)
+
+void yaffs_qsort(void *aa, size_t n, size_t es,
+		int (*cmp)(const void *, const void *));
+
+#define sort(base, n, sz, cmp_fn, swp) yaffs_qsort(base, n, sz, cmp_fn)
+
+#define YAFFS_PATH_DIVIDERS  "/"
+
+#ifdef NO_inline
+#define inline
+#else
+#define inline __inline__
+#endif
+
+#define kmalloc(x, flags) yaffsfs_malloc(x)
+#define kfree(x)   yaffsfs_free(x)
+#define vmalloc(x) yaffsfs_malloc(x)
+#define vfree(x) yaffsfs_free(x)
+
+#define cond_resched()  do {} while (0)
+
+#define yaffs_trace(msk, fmt, ...) do { \
+	if (yaffs_trace_mask & (msk)) \
+		printf("yaffs: " fmt "\n", ##__VA_ARGS__); \
+} while (0)
+
+
+#define YAFFS_LOSTNFOUND_NAME		"lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX		"obj"
+
+#include "yaffscfg.h"
+
+#define Y_CURRENT_TIME yaffsfs_CurrentTime()
+#define Y_TIME_CONVERT(x) x
+
+#define YAFFS_ROOT_MODE			0666
+#define YAFFS_LOSTNFOUND_MODE		0666
+
+#include "yaffs_list.h"
+
+#include "yaffsfs.h"
+
+#endif
+
+

flight/pios/common/libraries/yaffs2/inc/yportenv.h

@@ -0,0 +1,324 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YPORTENV_H__
+#define __YPORTENV_H__
+
+
+/* Definition of types */
+#ifdef CONFIG_YAFFS_DEFINES_TYPES
+typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned int u32;
+typedef signed int s32;
+#endif
+
+
+#ifdef CONFIG_YAFFS_PROVIDE_DEFS
+/* File types */
+
+
+#define DT_UNKNOWN	0
+#define DT_FIFO		1
+#define DT_CHR		2
+#define DT_DIR		4
+#define DT_BLK		6
+#define DT_REG		8
+#define DT_LNK		10
+#define DT_SOCK		12
+#define DT_WHT		14
+
+
+/*
+ * Attribute flags.
+ * These are or-ed together to select what has been changed.
+ */
+#define ATTR_MODE	1
+#define ATTR_UID	2
+#define ATTR_GID	4
+#define ATTR_SIZE	8
+#define ATTR_ATIME	16
+#define ATTR_MTIME	32
+#define ATTR_CTIME	64
+
+struct iattr {
+	unsigned int ia_valid;
+	unsigned ia_mode;
+	unsigned ia_uid;
+	unsigned ia_gid;
+	unsigned ia_size;
+	unsigned ia_atime;
+	unsigned ia_mtime;
+	unsigned ia_ctime;
+	unsigned int ia_attr_flags;
+};
+
+#endif
+
+
+
+#if defined CONFIG_YAFFS_WINCE
+
+#include "ywinceenv.h"
+
+
+#elif defined CONFIG_YAFFS_DIRECT
+
+/* Direct interface */
+#include "ydirectenv.h"
+
+#elif defined CONFIG_YAFFS_UTIL
+
+#include "yutilsenv.h"
+
+#else
+/* Should have specified a configuration type */
+#error Unknown configuration
+
+#endif
+
+#if defined(CONFIG_YAFFS_DIRECT) || defined(CONFIG_YAFFS_WINCE)
+
+#ifdef CONFIG_YAFFSFS_PROVIDE_VALUES
+
+#ifndef O_RDONLY
+#define O_RDONLY	00
+#endif
+
+#ifndef O_WRONLY
+#define O_WRONLY	01
+#endif
+
+#ifndef O_RDWR
+#define O_RDWR		02
+#endif
+
+#ifndef O_CREAT
+#define O_CREAT		0100
+#endif
+
+#ifndef O_EXCL
+#define O_EXCL		0200
+#endif
+
+#ifndef O_TRUNC
+#define O_TRUNC		01000
+#endif
+
+#ifndef O_APPEND
+#define O_APPEND	02000
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET	0
+#endif
+
+#ifndef SEEK_CUR
+#define SEEK_CUR	1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END	2
+#endif
+
+#ifndef EBUSY
+#define EBUSY	16
+#endif
+
+#ifndef ENODEV
+#define ENODEV	19
+#endif
+
+#ifndef EINVAL
+#define EINVAL	22
+#endif
+
+#ifndef ENFILE
+#define ENFILE	23
+#endif
+
+#ifndef EBADF
+#define EBADF	9
+#endif
+
+#ifndef EACCES
+#define EACCES	13
+#endif
+
+#ifndef EXDEV
+#define EXDEV	18
+#endif
+
+#ifndef ENOENT
+#define ENOENT	2
+#endif
+
+#ifndef ENOSPC
+#define ENOSPC	28
+#endif
+
+#ifndef EROFS
+#define EROFS	30
+#endif
+
+#ifndef ERANGE
+#define ERANGE 34
+#endif
+
+#ifndef ENODATA
+#define ENODATA 61
+#endif
+
+#ifndef ENOTEMPTY
+#define ENOTEMPTY 39
+#endif
+
+#ifndef ENAMETOOLONG
+#define ENAMETOOLONG 36
+#endif
+
+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+#ifndef EFAULT
+#define EFAULT 14
+#endif
+
+#ifndef EEXIST
+#define EEXIST 17
+#endif
+
+#ifndef ENOTDIR
+#define ENOTDIR 20
+#endif
+
+#ifndef EISDIR
+#define EISDIR 21
+#endif
+
+#ifndef ELOOP
+#define ELOOP	40
+#endif
+
+
+/* Mode flags */
+
+#ifndef S_IFMT
+#define S_IFMT		0170000
+#endif
+
+#ifndef S_IFSOCK
+#define S_IFSOCK	0140000
+#endif
+
+#ifndef S_IFIFO
+#define S_IFIFO		0010000
+#endif
+
+#ifndef S_IFCHR
+#define S_IFCHR		0020000
+#endif
+
+#ifndef S_IFBLK
+#define S_IFBLK		0060000
+#endif
+
+#ifndef S_IFLNK
+#define S_IFLNK		0120000
+#endif
+
+#ifndef S_IFDIR
+#define S_IFDIR		0040000
+#endif
+
+#ifndef S_IFREG
+#define S_IFREG		0100000
+#endif
+
+#ifndef S_ISSOCK
+#define S_ISSOCK(m)	(((m) & S_IFMT) == S_IFSOCK)
+#endif
+#ifndef S_ISLNK
+#define S_ISLNK(m)	(((m) & S_IFMT) == S_IFLNK)
+#endif
+#ifndef S_ISDIR
+#define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)
+#endif
+#ifndef S_ISREG
+#define S_ISREG(m)	(((m) & S_IFMT) == S_IFREG)
+#endif
+#ifndef S_ISBLK
+#define S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)
+#endif
+#ifndef S_ISCHR
+#define S_ISCHR(m)	(((m) & S_IFMT) == S_IFCHR)
+#endif
+#ifndef S_ISFIFO
+#define S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)
+#endif
+
+
+
+#ifndef S_IREAD
+#define S_IREAD		0000400
+#endif
+
+#ifndef S_IWRITE
+#define	S_IWRITE	0000200
+#endif
+
+#ifndef S_IEXEC
+#define	S_IEXEC	0000100
+#endif
+
+#ifndef XATTR_CREATE
+#define XATTR_CREATE 1
+#endif
+
+#ifndef XATTR_REPLACE
+#define XATTR_REPLACE 2
+#endif
+
+#ifndef R_OK
+#define R_OK	4
+#define W_OK	2
+#define X_OK	1
+#define F_OK	0
+#endif
+
+#else
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#endif
+
+#endif
+
+#ifndef Y_DUMP_STACK
+#define Y_DUMP_STACK() do { } while (0)
+#endif
+
+#ifndef BUG
+#define BUG() do {\
+	yaffs_trace(YAFFS_TRACE_BUG,\
+		"==>> yaffs bug: " __FILE__ " %d",\
+		__LINE__);\
+	Y_DUMP_STACK();\
+} while (0)
+#endif
+
+#endif

flight/pios/common/libraries/yaffs2/library.mk

@@ -0,0 +1,29 @@
+#
+# Rules to add yaffs2 to the PiOS target
+#
+#
+# Note that the PIOS target-specific makefile will detect that YAFFS2_DIR
+# has been defined and add in the target-specific pieces separately.
+#
+
+
+#
+# Directory containing this makefile
+#
+YAFFS2_DIR			:=	$(dir $(lastword $(MAKEFILE_LIST)))
+
+# Compiler options 
+#
+CDEFS				+= -DCONFIG_YAFFS_DIRECT
+CDEFS				+= -DCONFIG_YAFFS_YAFFS2
+CDEFS				+= -DCONFIG_YAFFS_DEFINES_TYPES
+CDEFS				+= -DCONFIG_YAFFS_PROVIDE_DEFS
+CDEFS				+= -DCONFIG_YAFFSFS_PROVIDE_VALUES
+CDEFS				+= -DCONFIG_YAFFS_OP
+#ARCHFLAGS			+= -DARCH_POSIX
+
+#
+# Yaffs2 device library source and includes
+#
+SRC				+=	$(sort $(wildcard $(YAFFS2_DIR)*.c))
+EXTRAINCDIRS			+=	$(YAFFS2_DIR)/inc

flight/pios/common/libraries/yaffs2/yaffs_allocator.c

@@ -0,0 +1,357 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+
+/*
+ * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks
+ * of approx 100 objects that are themn allocated singly.
+ * This is basically a simplified slab allocator.
+ *
+ * We don't use the Linux slab allocator because slab does not allow
+ * us to dump all the objects in one hit when we do a umount and tear
+ * down  all the tnodes and objects. slab requires that we first free
+ * the individual objects.
+ *
+ * Once yaffs has been mainlined I shall try to motivate for a change
+ * to slab to provide the extra features we need here.
+ */
+
+struct yaffs_tnode_list {
+	struct yaffs_tnode_list *next;
+	struct yaffs_tnode *tnodes;
+};
+
+struct yaffs_obj_list {
+	struct yaffs_obj_list *next;
+	struct yaffs_obj *objects;
+};
+
+struct yaffs_allocator {
+	int n_tnodes_created;
+	struct yaffs_tnode *free_tnodes;
+	int n_free_tnodes;
+	struct yaffs_tnode_list *alloc_tnode_list;
+
+	int n_obj_created;
+	struct list_head free_objs;
+	int n_free_objects;
+
+	struct yaffs_obj_list *allocated_obj_list;
+};
+
+static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	struct yaffs_tnode_list *tmp;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	while (allocator->alloc_tnode_list) {
+		tmp = allocator->alloc_tnode_list->next;
+
+		kfree(allocator->alloc_tnode_list->tnodes);
+		kfree(allocator->alloc_tnode_list);
+		allocator->alloc_tnode_list = tmp;
+	}
+
+	allocator->free_tnodes = NULL;
+	allocator->n_free_tnodes = 0;
+	allocator->n_tnodes_created = 0;
+}
+
+static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	allocator->alloc_tnode_list = NULL;
+	allocator->free_tnodes = NULL;
+	allocator->n_free_tnodes = 0;
+	allocator->n_tnodes_created = 0;
+}
+
+static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	int i;
+	struct yaffs_tnode *new_tnodes;
+	u8 *mem;
+	struct yaffs_tnode *curr;
+	struct yaffs_tnode *next;
+	struct yaffs_tnode_list *tnl;
+
+	if (!allocator) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	if (n_tnodes < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
+	mem = (u8 *) new_tnodes;
+
+	if (!new_tnodes) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"yaffs: Could not allocate Tnodes");
+		return YAFFS_FAIL;
+	}
+
+	/* New hookup for wide tnodes */
+	for (i = 0; i < n_tnodes - 1; i++) {
+		curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
+		next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
+		curr->internal[0] = next;
+	}
+
+	curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
+	curr->internal[0] = allocator->free_tnodes;
+	allocator->free_tnodes = (struct yaffs_tnode *)mem;
+
+	allocator->n_free_tnodes += n_tnodes;
+	allocator->n_tnodes_created += n_tnodes;
+
+	/* Now add this bunch of tnodes to a list for freeing up.
+	 * NB If we can't add this to the management list it isn't fatal
+	 * but it just means we can't free this bunch of tnodes later.
+	 */
+	tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
+	if (!tnl) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Could not add tnodes to management list");
+		return YAFFS_FAIL;
+	} else {
+		tnl->tnodes = new_tnodes;
+		tnl->next = allocator->alloc_tnode_list;
+		allocator->alloc_tnode_list = tnl;
+	}
+
+	yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added");
+
+	return YAFFS_OK;
+}
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	struct yaffs_tnode *tn = NULL;
+
+	if (!allocator) {
+		BUG();
+		return NULL;
+	}
+
+	/* If there are none left make more */
+	if (!allocator->free_tnodes)
+		yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
+
+	if (allocator->free_tnodes) {
+		tn = allocator->free_tnodes;
+		allocator->free_tnodes = allocator->free_tnodes->internal[0];
+		allocator->n_free_tnodes--;
+	}
+
+	return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	if (tn) {
+		tn->internal[0] = allocator->free_tnodes;
+		allocator->free_tnodes = tn;
+		allocator->n_free_tnodes++;
+	}
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
+
+/*--------------- yaffs_obj alloaction ------------------------
+ *
+ * Free yaffs_objs are stored in a list using obj->siblings.
+ * The blocks of allocated objects are stored in a linked list.
+ */
+
+static void yaffs_init_raw_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	allocator->allocated_obj_list = NULL;
+	INIT_LIST_HEAD(&allocator->free_objs);
+	allocator->n_free_objects = 0;
+}
+
+static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+	struct yaffs_obj_list *tmp;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	while (allocator->allocated_obj_list) {
+		tmp = allocator->allocated_obj_list->next;
+		kfree(allocator->allocated_obj_list->objects);
+		kfree(allocator->allocated_obj_list);
+		allocator->allocated_obj_list = tmp;
+	}
+
+	INIT_LIST_HEAD(&allocator->free_objs);
+	allocator->n_free_objects = 0;
+	allocator->n_obj_created = 0;
+}
+
+static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+	int i;
+	struct yaffs_obj *new_objs;
+	struct yaffs_obj_list *list;
+
+	if (!allocator) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	if (n_obj < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
+	list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
+
+	if (!new_objs || !list) {
+		kfree(new_objs);
+		new_objs = NULL;
+		kfree(list);
+		list = NULL;
+		yaffs_trace(YAFFS_TRACE_ALLOCATE,
+			"Could not allocate more objects");
+		return YAFFS_FAIL;
+	}
+
+	/* Hook them into the free list */
+	for (i = 0; i < n_obj; i++)
+		list_add(&new_objs[i].siblings, &allocator->free_objs);
+
+	allocator->n_free_objects += n_obj;
+	allocator->n_obj_created += n_obj;
+
+	/* Now add this bunch of Objects to a list for freeing up. */
+
+	list->objects = new_objs;
+	list->next = allocator->allocated_obj_list;
+	allocator->allocated_obj_list = list;
+
+	return YAFFS_OK;
+}
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj = NULL;
+	struct list_head *lh;
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return obj;
+	}
+
+	/* If there are none left make more */
+	if (list_empty(&allocator->free_objs))
+		yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+	if (!list_empty(&allocator->free_objs)) {
+		lh = allocator->free_objs.next;
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		list_del_init(lh);
+		allocator->n_free_objects--;
+	}
+
+	return obj;
+}
+
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	/* Link into the free list. */
+	list_add(&obj->siblings, &allocator->free_objs);
+	allocator->n_free_objects++;
+}
+
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+
+	if (!dev->allocator) {
+		BUG();
+		return;
+	}
+
+	yaffs_deinit_raw_tnodes(dev);
+	yaffs_deinit_raw_objs(dev);
+	kfree(dev->allocator);
+	dev->allocator = NULL;
+}
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator;
+
+	if (dev->allocator) {
+		BUG();
+		return;
+	}
+
+	allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
+	if (allocator) {
+		dev->allocator = allocator;
+		yaffs_init_raw_tnodes(dev);
+		yaffs_init_raw_objs(dev);
+	}
+}
+

flight/pios/common/libraries/yaffs2/yaffs_attribs.c

@@ -0,0 +1,110 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_attribs.h"
+
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
+{
+#ifdef CONFIG_YAFFS_WINCE
+	obj->win_atime[0] = oh->win_atime[0];
+	obj->win_ctime[0] = oh->win_ctime[0];
+	obj->win_mtime[0] = oh->win_mtime[0];
+	obj->win_atime[1] = oh->win_atime[1];
+	obj->win_ctime[1] = oh->win_ctime[1];
+	obj->win_mtime[1] = oh->win_mtime[1];
+#else
+	obj->yst_uid = oh->yst_uid;
+	obj->yst_gid = oh->yst_gid;
+	obj->yst_atime = oh->yst_atime;
+	obj->yst_mtime = oh->yst_mtime;
+	obj->yst_ctime = oh->yst_ctime;
+	obj->yst_rdev = oh->yst_rdev;
+#endif
+}
+
+
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
+{
+#ifdef CONFIG_YAFFS_WINCE
+	oh->win_atime[0] = obj->win_atime[0];
+	oh->win_ctime[0] = obj->win_ctime[0];
+	oh->win_mtime[0] = obj->win_mtime[0];
+	oh->win_atime[1] = obj->win_atime[1];
+	oh->win_ctime[1] = obj->win_ctime[1];
+	oh->win_mtime[1] = obj->win_mtime[1];
+#else
+	oh->yst_uid = obj->yst_uid;
+	oh->yst_gid = obj->yst_gid;
+	oh->yst_atime = obj->yst_atime;
+	oh->yst_mtime = obj->yst_mtime;
+	oh->yst_ctime = obj->yst_ctime;
+	oh->yst_rdev = obj->yst_rdev;
+#endif
+}
+
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
+{
+
+#ifdef CONFIG_YAFFS_WINCE
+	yfsd_win_file_time_now(obj->win_atime);
+	obj->win_ctime[0] = obj->win_mtime[0] = obj->win_atime[0];
+	obj->win_ctime[1] = obj->win_mtime[1] = obj->win_atime[1];
+
+#else
+	yaffs_load_current_time(obj, 1, 1);
+	obj->yst_rdev = rdev;
+	obj->yst_uid = uid;
+	obj->yst_gid = gid;
+#endif
+}
+
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
+{
+#ifdef CONFIG_YAFFS_WINCE
+	yfsd_win_file_time_now(obj->win_atime);
+	obj->win_ctime[0] = obj->win_mtime[0] =
+	    obj->win_atime[0];
+	obj->win_ctime[1] = obj->win_mtime[1] =
+	    obj->win_atime[1];
+
+#else
+
+	obj->yst_mtime = Y_CURRENT_TIME;
+	if (do_a)
+		obj->yst_atime = obj->yst_atime;
+	if (do_c)
+		obj->yst_ctime = obj->yst_atime;
+#endif
+}
+
+#ifndef CONFIG_YAFFS_OP  // unused yaffs code
+static Y_LOFF_T yaffs_get_file_size(struct yaffs_obj *obj)
+{
+	YCHAR *alias = NULL;
+	obj = yaffs_get_equivalent_obj(obj);
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return obj->variant.file_variant.file_size;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = obj->variant.symlink_variant.alias;
+		if (!alias)
+			return 0;
+		return yaffs_strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
+	default:
+		return 0;
+	}
+}
+#endif
+

flight/pios/common/libraries/yaffs2/yaffs_bitmap.c

@@ -0,0 +1,97 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_bitmap.h"
+#include "yaffs_trace.h"
+/*
+ * Chunk bitmap manipulations
+ */
+
+static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
+{
+	if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"BlockBits block %d is not valid",
+			blk);
+		BUG();
+	}
+	return dev->chunk_bits +
+	    (dev->chunk_bit_stride * (blk - dev->internal_start_block));
+}
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
+{
+	if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
+	    chunk < 0 || chunk >= dev->param.chunks_per_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Chunk Id (%d:%d) invalid",
+			blk, chunk);
+		BUG();
+	}
+}
+
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	memset(blk_bits, 0, dev->chunk_bit_stride);
+}
+
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	blk_bits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+	int i;
+
+	for (i = 0; i < dev->chunk_bit_stride; i++) {
+		if (*blk_bits)
+			return 1;
+		blk_bits++;
+	}
+	return 0;
+}
+
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+	int i;
+	int n = 0;
+
+	for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
+		n += hweight8(*blk_bits);
+
+	return n;
+}

flight/pios/common/libraries/yaffs2/yaffs_checkptrw.c

@@ -0,0 +1,477 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_checkptrw.h"
+#include "yaffs_getblockinfo.h"
+
+struct yaffs_checkpt_chunk_hdr {
+	int version;
+	int seq;
+	u32 sum;
+	u32 xor;
+} ;
+
+
+static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
+{
+	return chunk - dev->chunk_offset;
+}
+
+static int apply_block_offset(struct yaffs_dev *dev, int block)
+{
+	return block - dev->block_offset;
+}
+
+static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_chunk_hdr hdr;
+
+	hdr.version = YAFFS_CHECKPOINT_VERSION;
+	hdr.seq = dev->checkpt_page_seq;
+	hdr.sum = dev->checkpt_sum;
+	hdr.xor = dev->checkpt_xor;
+
+	dev->checkpt_byte_offs = sizeof(hdr);
+
+	memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr));
+}
+
+static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_chunk_hdr hdr;
+
+	memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr));
+
+	dev->checkpt_byte_offs = sizeof(hdr);
+
+	return hdr.version == YAFFS_CHECKPOINT_VERSION &&
+		hdr.seq == dev->checkpt_page_seq &&
+		hdr.sum == dev->checkpt_sum &&
+		hdr.xor == dev->checkpt_xor;
+}
+
+static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
+{
+	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpt blocks_avail = %d", blocks_avail);
+
+	return (blocks_avail <= 0) ? 0 : 1;
+}
+
+static int yaffs_checkpt_erase(struct yaffs_dev *dev)
+{
+	int i;
+
+	if (!dev->drv.drv_erase_fn)
+		return 0;
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checking blocks %d to %d",
+		dev->internal_start_block, dev->internal_end_block);
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+		int offset_i = apply_block_offset(dev, i);
+		int result;
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"erasing checkpt block %d", i);
+
+			dev->n_erasures++;
+
+			result = dev->drv.drv_erase_fn(dev, offset_i);
+			if(result) {
+				bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+				dev->n_erased_blocks++;
+				dev->n_free_chunks +=
+				    dev->param.chunks_per_block;
+			} else {
+				dev->drv.drv_mark_bad_fn(dev, offset_i);
+				bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+			}
+		}
+	}
+
+	dev->blocks_in_checkpt = 0;
+
+	return 1;
+}
+
+static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
+{
+	int i;
+	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"allocating checkpt block: erased %d reserved %d avail %d next %d ",
+		dev->n_erased_blocks, dev->param.n_reserved_blocks,
+		blocks_avail, dev->checkpt_next_block);
+
+	if (dev->checkpt_next_block >= 0 &&
+	    dev->checkpt_next_block <= dev->internal_end_block &&
+	    blocks_avail > 0) {
+
+		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+		     i++) {
+			struct yaffs_block_info *bi;
+
+			bi = yaffs_get_block_info(dev, i);
+			if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+				dev->checkpt_next_block = i + 1;
+				dev->checkpt_cur_block = i;
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+					"allocating checkpt block %d", i);
+				return;
+			}
+		}
+	}
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
+
+	dev->checkpt_next_block = -1;
+	dev->checkpt_cur_block = -1;
+}
+
+static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
+{
+	int i;
+	struct yaffs_ext_tags tags;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"find next checkpt block: start:  blocks %d next %d",
+		dev->blocks_in_checkpt, dev->checkpt_next_block);
+
+	if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
+		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+		     i++) {
+			int chunk = i * dev->param.chunks_per_block;
+			enum yaffs_block_state state;
+			u32 seq;
+
+			dev->tagger.read_chunk_tags_fn(dev,
+					apply_chunk_offset(dev, chunk),
+					NULL, &tags);
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
+				i, (int) state,
+				tags.obj_id, tags.seq_number,
+				tags.ecc_result);
+
+			if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
+				continue;
+
+			dev->tagger.query_block_fn(dev,
+						apply_block_offset(dev, i),
+						&state, &seq);
+			if (state == YAFFS_BLOCK_STATE_DEAD)
+				continue;
+
+			/* Right kind of block */
+			dev->checkpt_next_block = tags.obj_id;
+			dev->checkpt_cur_block = i;
+			dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
+			dev->blocks_in_checkpt++;
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"found checkpt block %d", i);
+			return;
+		}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
+
+	dev->checkpt_next_block = -1;
+	dev->checkpt_cur_block = -1;
+}
+
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
+{
+	int i;
+
+	dev->checkpt_open_write = writing;
+
+	/* Got the functions we need? */
+	if (!dev->tagger.write_chunk_tags_fn ||
+	    !dev->tagger.read_chunk_tags_fn ||
+	    !dev->drv.drv_erase_fn ||
+	    !dev->drv.drv_mark_bad_fn)
+		return 0;
+
+	if (writing && !yaffs2_checkpt_space_ok(dev))
+		return 0;
+
+	if (!dev->checkpt_buffer)
+		dev->checkpt_buffer =
+		    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+	if (!dev->checkpt_buffer)
+		return 0;
+
+	dev->checkpt_page_seq = 0;
+	dev->checkpt_byte_count = 0;
+	dev->checkpt_sum = 0;
+	dev->checkpt_xor = 0;
+	dev->checkpt_cur_block = -1;
+	dev->checkpt_cur_chunk = -1;
+	dev->checkpt_next_block = dev->internal_start_block;
+
+	if (writing) {
+		memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
+		yaffs2_checkpt_init_chunk_hdr(dev);
+		return yaffs_checkpt_erase(dev);
+	}
+
+	/* Opening for a read */
+	/* Set to a value that will kick off a read */
+	dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
+	/* A checkpoint block list of 1 checkpoint block per 16 block is
+	 * (hopefully) going to be way more than we need */
+	dev->blocks_in_checkpt = 0;
+	dev->checkpt_max_blocks =
+	    (dev->internal_end_block - dev->internal_start_block) / 16 + 2;
+	dev->checkpt_block_list =
+	    kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
+
+	if (!dev->checkpt_block_list)
+		return 0;
+
+	for (i = 0; i < dev->checkpt_max_blocks; i++)
+		dev->checkpt_block_list[i] = -1;
+
+	return 1;
+}
+
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
+{
+	u32 composite_sum;
+
+	composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);
+	*sum = composite_sum;
+	return 1;
+}
+
+static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
+{
+	int chunk;
+	int offset_chunk;
+	struct yaffs_ext_tags tags;
+
+	if (dev->checkpt_cur_block < 0) {
+		yaffs2_checkpt_find_erased_block(dev);
+		dev->checkpt_cur_chunk = 0;
+	}
+
+	if (dev->checkpt_cur_block < 0)
+		return 0;
+
+	tags.is_deleted = 0;
+	tags.obj_id = dev->checkpt_next_block;	/* Hint to next place to look */
+	tags.chunk_id = dev->checkpt_page_seq + 1;
+	tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
+	tags.n_bytes = dev->data_bytes_per_chunk;
+	if (dev->checkpt_cur_chunk == 0) {
+		/* First chunk we write for the block? Set block state to
+		   checkpoint */
+		struct yaffs_block_info *bi =
+		    yaffs_get_block_info(dev, dev->checkpt_cur_block);
+		bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		dev->blocks_in_checkpt++;
+	}
+
+	chunk =
+	    dev->checkpt_cur_block * dev->param.chunks_per_block +
+	    dev->checkpt_cur_chunk;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
+		chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
+		tags.obj_id, tags.chunk_id);
+
+	offset_chunk = apply_chunk_offset(dev, chunk);
+
+	dev->n_page_writes++;
+
+	dev->tagger.write_chunk_tags_fn(dev, offset_chunk,
+				       dev->checkpt_buffer, &tags);
+	dev->checkpt_page_seq++;
+	dev->checkpt_cur_chunk++;
+	if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
+		dev->checkpt_cur_chunk = 0;
+		dev->checkpt_cur_block = -1;
+	}
+	memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
+
+	yaffs2_checkpt_init_chunk_hdr(dev);
+
+
+	return 1;
+}
+
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)
+{
+	int i = 0;
+	int ok = 1;
+	u8 *data_bytes = (u8 *) data;
+
+	if (!dev->checkpt_buffer)
+		return 0;
+
+	if (!dev->checkpt_open_write)
+		return -1;
+
+	while (i < n_bytes && ok) {
+		dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
+		dev->checkpt_sum += *data_bytes;
+		dev->checkpt_xor ^= *data_bytes;
+
+		dev->checkpt_byte_offs++;
+		i++;
+		data_bytes++;
+		dev->checkpt_byte_count++;
+
+		if (dev->checkpt_byte_offs < 0 ||
+		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
+			ok = yaffs2_checkpt_flush_buffer(dev);
+	}
+
+	return i;
+}
+
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
+{
+	int i = 0;
+	int ok = 1;
+	struct yaffs_ext_tags tags;
+	int chunk;
+	int offset_chunk;
+	u8 *data_bytes = (u8 *) data;
+
+	if (!dev->checkpt_buffer)
+		return 0;
+
+	if (dev->checkpt_open_write)
+		return -1;
+
+	while (i < n_bytes && ok) {
+
+		if (dev->checkpt_byte_offs < 0 ||
+		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
+
+			if (dev->checkpt_cur_block < 0) {
+				yaffs2_checkpt_find_block(dev);
+				dev->checkpt_cur_chunk = 0;
+			}
+
+			if (dev->checkpt_cur_block < 0) {
+				ok = 0;
+				break;
+			}
+
+			chunk = dev->checkpt_cur_block *
+			    dev->param.chunks_per_block +
+			    dev->checkpt_cur_chunk;
+
+			offset_chunk = apply_chunk_offset(dev, chunk);
+			dev->n_page_reads++;
+
+			/* read in the next chunk */
+			dev->tagger.read_chunk_tags_fn(dev,
+						offset_chunk,
+						dev->checkpt_buffer,
+						&tags);
+#ifdef CONFIG_YAFFS_OP
+			if (tags.chunk_id != (u32)(dev->checkpt_page_seq + 1) ||
+#else
+			if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||
+#endif
+			    tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
+			    tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) {
+				ok = 0;
+				break;
+			}
+			if(!yaffs2_checkpt_check_chunk_hdr(dev)) {
+				ok = 0;
+				break;
+			}
+
+			dev->checkpt_page_seq++;
+			dev->checkpt_cur_chunk++;
+
+			if (dev->checkpt_cur_chunk >=
+					dev->param.chunks_per_block)
+				dev->checkpt_cur_block = -1;
+
+		}
+
+		*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
+		dev->checkpt_sum += *data_bytes;
+		dev->checkpt_xor ^= *data_bytes;
+		dev->checkpt_byte_offs++;
+		i++;
+		data_bytes++;
+		dev->checkpt_byte_count++;
+	}
+
+	return i;
+}
+
+int yaffs_checkpt_close(struct yaffs_dev *dev)
+{
+	int i;
+
+	if (dev->checkpt_open_write) {
+		if (dev->checkpt_byte_offs !=
+			sizeof(sizeof(struct yaffs_checkpt_chunk_hdr)))
+			yaffs2_checkpt_flush_buffer(dev);
+	} else if (dev->checkpt_block_list) {
+		for (i = 0;
+		     i < dev->blocks_in_checkpt &&
+		     dev->checkpt_block_list[i] >= 0; i++) {
+			int blk = dev->checkpt_block_list[i];
+			struct yaffs_block_info *bi = NULL;
+
+			if (dev->internal_start_block <= blk &&
+			    blk <= dev->internal_end_block)
+				bi = yaffs_get_block_info(dev, blk);
+			if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
+				bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		}
+		kfree(dev->checkpt_block_list);
+		dev->checkpt_block_list = NULL;
+	}
+
+	dev->n_free_chunks -=
+		dev->blocks_in_checkpt * dev->param.chunks_per_block;
+	dev->n_erased_blocks -= dev->blocks_in_checkpt;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d",
+		dev->checkpt_byte_count);
+
+	if (dev->checkpt_buffer) {
+		/* free the buffer */
+		kfree(dev->checkpt_buffer);
+		dev->checkpt_buffer = NULL;
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
+{
+	/* Erase the checkpoint data */
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpoint invalidate of %d blocks",
+		dev->blocks_in_checkpt);
+
+	return yaffs_checkpt_erase(dev);
+}

flight/pios/common/libraries/yaffs2/yaffs_ecc.c

@@ -0,0 +1,281 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two
+ * such ECC blocks are used on a 512-byte NAND page.
+ *
+ */
+
+#include "yportenv.h"
+
+#include "yaffs_ecc.h"
+
+/* Table generated by gen-ecc.c
+ * Using a table means we do not have to calculate p1..p4 and p1'..p4'
+ * for each byte of data. These are instead provided in a table in bits7..2.
+ * Bit 0 of each entry indicates whether the entry has an odd or even parity,
+ * and therefore this bytes influence on the line parity.
+ */
+
+static const unsigned char column_parity_table[] = {
+	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+};
+
+
+/* Calculate the ECC for a 256-byte block of data */
+void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc)
+{
+	unsigned int i;
+	unsigned char col_parity = 0;
+	unsigned char line_parity = 0;
+	unsigned char line_parity_prime = 0;
+	unsigned char t;
+	unsigned char b;
+
+	for (i = 0; i < 256; i++) {
+		b = column_parity_table[*data++];
+		col_parity ^= b;
+
+		if (b & 0x01) {	/* odd number of bits in the byte */
+			line_parity ^= i;
+			line_parity_prime ^= ~i;
+		}
+	}
+
+	ecc[2] = (~col_parity) | 0x03;
+
+	t = 0;
+	if (line_parity & 0x80)
+		t |= 0x80;
+	if (line_parity_prime & 0x80)
+		t |= 0x40;
+	if (line_parity & 0x40)
+		t |= 0x20;
+	if (line_parity_prime & 0x40)
+		t |= 0x10;
+	if (line_parity & 0x20)
+		t |= 0x08;
+	if (line_parity_prime & 0x20)
+		t |= 0x04;
+	if (line_parity & 0x10)
+		t |= 0x02;
+	if (line_parity_prime & 0x10)
+		t |= 0x01;
+	ecc[1] = ~t;
+
+	t = 0;
+	if (line_parity & 0x08)
+		t |= 0x80;
+	if (line_parity_prime & 0x08)
+		t |= 0x40;
+	if (line_parity & 0x04)
+		t |= 0x20;
+	if (line_parity_prime & 0x04)
+		t |= 0x10;
+	if (line_parity & 0x02)
+		t |= 0x08;
+	if (line_parity_prime & 0x02)
+		t |= 0x04;
+	if (line_parity & 0x01)
+		t |= 0x02;
+	if (line_parity_prime & 0x01)
+		t |= 0x01;
+	ecc[0] = ~t;
+
+}
+
+/* Correct the ECC on a 256 byte block of data */
+
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+		      const unsigned char *test_ecc)
+{
+	unsigned char d0, d1, d2;	/* deltas */
+
+	d0 = read_ecc[0] ^ test_ecc[0];
+	d1 = read_ecc[1] ^ test_ecc[1];
+	d2 = read_ecc[2] ^ test_ecc[2];
+
+	if ((d0 | d1 | d2) == 0)
+		return 0;	/* no error */
+
+	if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
+	    ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
+	    ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
+		/* Single bit (recoverable) error in data */
+
+		unsigned byte;
+		unsigned bit;
+
+		bit = byte = 0;
+
+		if (d1 & 0x80)
+			byte |= 0x80;
+		if (d1 & 0x20)
+			byte |= 0x40;
+		if (d1 & 0x08)
+			byte |= 0x20;
+		if (d1 & 0x02)
+			byte |= 0x10;
+		if (d0 & 0x80)
+			byte |= 0x08;
+		if (d0 & 0x20)
+			byte |= 0x04;
+		if (d0 & 0x08)
+			byte |= 0x02;
+		if (d0 & 0x02)
+			byte |= 0x01;
+
+		if (d2 & 0x80)
+			bit |= 0x04;
+		if (d2 & 0x20)
+			bit |= 0x02;
+		if (d2 & 0x08)
+			bit |= 0x01;
+
+		data[byte] ^= (1 << bit);
+
+		return 1;	/* Corrected the error */
+	}
+
+	if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
+		/* Reccoverable error in ecc */
+
+		read_ecc[0] = test_ecc[0];
+		read_ecc[1] = test_ecc[1];
+		read_ecc[2] = test_ecc[2];
+
+		return 1;	/* Corrected the error */
+	}
+
+	/* Unrecoverable error */
+
+	return -1;
+
+}
+
+/*
+ * ECCxxxOther does ECC calcs on arbitrary n bytes of data
+ */
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+			  struct yaffs_ecc_other *ecc_other)
+{
+	unsigned int i;
+	unsigned char col_parity = 0;
+	unsigned line_parity = 0;
+	unsigned line_parity_prime = 0;
+	unsigned char b;
+
+	for (i = 0; i < n_bytes; i++) {
+		b = column_parity_table[*data++];
+		col_parity ^= b;
+
+		if (b & 0x01) {
+			/* odd number of bits in the byte */
+			line_parity ^= i;
+			line_parity_prime ^= ~i;
+		}
+
+	}
+
+	ecc_other->col_parity = (col_parity >> 2) & 0x3f;
+	ecc_other->line_parity = line_parity;
+	ecc_other->line_parity_prime = line_parity_prime;
+}
+
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+			    struct yaffs_ecc_other *read_ecc,
+			    const struct yaffs_ecc_other *test_ecc)
+{
+	unsigned char delta_col;	/* column parity delta */
+	unsigned delta_line;	/* line parity delta */
+	unsigned delta_line_prime;	/* line parity delta */
+	unsigned bit;
+
+	delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
+	delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
+	delta_line_prime =
+	    read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
+
+	if ((delta_col | delta_line | delta_line_prime) == 0)
+		return 0;	/* no error */
+
+	if (delta_line == ~delta_line_prime &&
+	    (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
+		/* Single bit (recoverable) error in data */
+
+		bit = 0;
+
+		if (delta_col & 0x20)
+			bit |= 0x04;
+		if (delta_col & 0x08)
+			bit |= 0x02;
+		if (delta_col & 0x02)
+			bit |= 0x01;
+
+		if (delta_line >= n_bytes)
+			return -1;
+
+		data[delta_line] ^= (1 << bit);
+
+		return 1;	/* corrected */
+	}
+
+	if ((hweight32(delta_line) +
+	     hweight32(delta_line_prime) +
+	     hweight8(delta_col)) == 1) {
+		/* Reccoverable error in ecc */
+
+		*read_ecc = *test_ecc;
+		return 1;	/* corrected */
+	}
+
+	/* Unrecoverable error */
+
+	return -1;
+}

flight/pios/common/libraries/yaffs2/yaffs_error.c

@@ -0,0 +1,58 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Timothy Manning <timothy@yaffs.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffsfs.h"
+
+struct error_entry {
+	int code;
+	const char *text;
+};
+
+static const struct error_entry error_list[] = {
+	{ ENOMEM , "ENOMEM" },
+	{ EBUSY , "EBUSY"},
+	{ ENODEV , "ENODEV"},
+	{ EINVAL , "EINVAL"},
+	{ EBADF , "EBADF"},
+	{ EACCES , "EACCES"},
+	{ EXDEV , "EXDEV" },
+	{ ENOENT , "ENOENT"},
+	{ ENOSPC , "ENOSPC"},
+	{ ERANGE , "ERANGE"},
+	{ ENODATA, "ENODATA"},
+	{ ENOTEMPTY, "ENOTEMPTY"},
+	{ ENAMETOOLONG, "ENAMETOOLONG"},
+	{ ENOMEM , "ENOMEM"},
+	{ EEXIST , "EEXIST"},
+	{ ENOTDIR , "ENOTDIR"},
+	{ EISDIR , "EISDIR"},
+	{ ENFILE, "ENFILE"},
+	{ EROFS, "EROFS"},
+	{ EFAULT, "EFAULT"},
+	{ 0, NULL }
+};
+
+const char *yaffs_error_to_str(int err)
+{
+	const struct error_entry *e = error_list;
+
+	if (err < 0)
+		err = -err;
+
+	while (e->code && e->text) {
+		if (err == e->code)
+			return e->text;
+		e++;
+	}
+	return "Unknown error code";
+}

flight/pios/common/libraries/yaffs2/yaffs_guts.c

@@ -0,0 +1,5175 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_guts.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_tagsmarshall.h"
+#include "yaffs_nand.h"
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
+#include "yaffs_nand.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
+#include "yaffs_attribs.h"
+#include "yaffs_summary.h"
+
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
+
+#include "yaffs_ecc.h"
+
+/* Forward declarations */
+
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+			     const u8 *buffer, int n_bytes, int use_reserve);
+
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
+				int buffer_size);
+
+/* Function to calculate chunk and offset */
+
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, Y_LOFF_T addr,
+				int *chunk_out, u32 *offset_out)
+{
+	int chunk;
+	u32 offset;
+
+	chunk = (u32) (addr >> dev->chunk_shift);
+
+	if (dev->chunk_div == 1) {
+		/* easy power of 2 case */
+		offset = (u32) (addr & dev->chunk_mask);
+	} else {
+		/* Non power-of-2 case */
+
+		Y_LOFF_T chunk_base;
+
+		chunk /= dev->chunk_div;
+
+		chunk_base = ((Y_LOFF_T) chunk) * dev->data_bytes_per_chunk;
+		offset = (u32) (addr - chunk_base);
+	}
+
+	*chunk_out = chunk;
+	*offset_out = offset;
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or
+ * equal to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+
+static inline u32 calc_shifts_ceiling(u32 x)
+{
+	int extra_bits;
+	int shifts;
+
+	shifts = extra_bits = 0;
+
+	while (x > 1) {
+		if (x & 1)
+			extra_bits++;
+		x >>= 1;
+		shifts++;
+	}
+
+	if (extra_bits)
+		shifts++;
+
+	return shifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+
+static inline u32 calc_shifts(u32 x)
+{
+	u32 shifts;
+
+	shifts = 0;
+
+	if (!x)
+		return 0;
+
+	while (!(x & 1)) {
+		x >>= 1;
+		shifts++;
+	}
+
+	return shifts;
+}
+
+/*
+ * Temporary buffer manipulations.
+ */
+
+static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
+{
+	int i;
+	u8 *buf = (u8 *) 1;
+
+	memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
+
+	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+		dev->temp_buffer[i].in_use = 0;
+		buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+		dev->temp_buffer[i].buffer = buf;
+	}
+
+	return buf ? YAFFS_OK : YAFFS_FAIL;
+}
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
+{
+	int i;
+
+	dev->temp_in_use++;
+	if (dev->temp_in_use > dev->max_temp)
+		dev->max_temp = dev->temp_in_use;
+
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->temp_buffer[i].in_use == 0) {
+			dev->temp_buffer[i].in_use = 1;
+			return dev->temp_buffer[i].buffer;
+		}
+	}
+
+	yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
+	/*
+	 * If we got here then we have to allocate an unmanaged one
+	 * This is not good.
+	 */
+
+	dev->unmanaged_buffer_allocs++;
+	return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
+
+}
+
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
+{
+	int i;
+
+	dev->temp_in_use--;
+
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->temp_buffer[i].buffer == buffer) {
+			dev->temp_buffer[i].in_use = 0;
+			return;
+		}
+	}
+
+	if (buffer) {
+		/* assume it is an unmanaged one. */
+		yaffs_trace(YAFFS_TRACE_BUFFERS,
+			"Releasing unmanaged temp buffer");
+		kfree(buffer);
+		dev->unmanaged_buffer_deallocs++;
+	}
+
+}
+
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+				     const u8 *data,
+				     const struct yaffs_ext_tags *tags)
+{
+	(void) dev;
+	(void) nand_chunk;
+	(void) data;
+	(void) tags;
+}
+
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+				      const struct yaffs_ext_tags *tags)
+{
+	(void) dev;
+	(void) nand_chunk;
+	(void) tags;
+}
+
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+			      struct yaffs_block_info *bi)
+{
+	if (!bi->gc_prioritise) {
+		bi->gc_prioritise = 1;
+		dev->has_pending_prioritised_gc = 1;
+		bi->chunk_error_strikes++;
+
+		if (bi->chunk_error_strikes > 3) {
+			bi->needs_retiring = 1;	/* Too many stikes, so retire */
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"yaffs: Block struck out");
+
+		}
+	}
+}
+
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+					int erased_ok)
+{
+	int flash_block = nand_chunk / dev->param.chunks_per_block;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+	yaffs_handle_chunk_error(dev, bi);
+
+	if (erased_ok) {
+		/* Was an actual write failure,
+		 * so mark the block for retirement.*/
+		bi->needs_retiring = 1;
+		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  "**>> Block %d needs retiring", flash_block);
+	}
+
+	/* Delete the chunk */
+	yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+	yaffs_skip_rest_of_block(dev);
+}
+
+/*
+ * Verification code
+ */
+
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
+
+static inline int yaffs_hash_fn(int n)
+{
+	if (n < 0)
+		n = -n;
+	return n % YAFFS_NOBJECT_BUCKETS;
+}
+
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
+
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
+{
+	return dev->root_dir;
+}
+
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
+{
+	return dev->lost_n_found;
+}
+
+/*
+ *  Erased NAND checking functions
+ */
+
+int yaffs_check_ff(u8 *buffer, int n_bytes)
+{
+	/* Horrible, slow implementation */
+	while (n_bytes--) {
+		if (*buffer != 0xff)
+			return 0;
+		buffer++;
+	}
+	return 1;
+}
+
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
+{
+	int retval = YAFFS_OK;
+	u8 *data = yaffs_get_temp_buffer(dev);
+	struct yaffs_ext_tags tags;
+
+	if (!yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags))
+	{
+		yaffs_trace(YAFFS_TRACE_ERROR, "yaffs_check_chunk_erased: unhandled error from rd_chunk_tags_nand");
+	}
+
+
+        if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
+		retval = YAFFS_FAIL;
+
+	if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
+		tags.chunk_used) {
+		yaffs_trace(YAFFS_TRACE_NANDACCESS,
+			"Chunk %d not erased", nand_chunk);
+		retval = YAFFS_FAIL;
+	}
+
+
+	yaffs_release_temp_buffer(dev, data);
+
+	return retval;
+
+}
+
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+				      int nand_chunk,
+				      const u8 *data,
+				      struct yaffs_ext_tags *tags)
+{
+	int retval = YAFFS_OK;
+	struct yaffs_ext_tags temp_tags;
+	u8 *buffer = yaffs_get_temp_buffer(dev);
+
+	if (!yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags))
+	{
+		yaffs_trace(YAFFS_TRACE_ERROR, "yaffs_verify_chunk_written: unhandled error from rd_chunk_tags_nand");
+	}
+
+	if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
+	    temp_tags.obj_id != tags->obj_id ||
+	    temp_tags.chunk_id != tags->chunk_id ||
+	    temp_tags.n_bytes != tags->n_bytes)
+		retval = YAFFS_FAIL;
+
+	yaffs_release_temp_buffer(dev, buffer);
+
+	return retval;
+}
+
+
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
+{
+	int reserved_chunks;
+	int reserved_blocks = dev->param.n_reserved_blocks;
+	int checkpt_blocks;
+
+	checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
+
+	reserved_chunks =
+	    (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
+
+	return (dev->n_free_chunks > (reserved_chunks + n_chunks));
+}
+
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
+{
+	int i;
+	struct yaffs_block_info *bi;
+
+	if (dev->n_erased_blocks < 1) {
+		/* Hoosterman we've got a problem.
+		 * Can't get space to gc
+		 */
+		yaffs_trace(YAFFS_TRACE_ERROR,
+		  "yaffs tragedy: no more erased blocks");
+
+		return -1;
+	}
+
+	/* Find an empty block. */
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		dev->alloc_block_finder++;
+		if (dev->alloc_block_finder < dev->internal_start_block
+		    || dev->alloc_block_finder > dev->internal_end_block) {
+			dev->alloc_block_finder = dev->internal_start_block;
+		}
+
+		bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+			bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
+			dev->seq_number++;
+			bi->seq_number = dev->seq_number;
+			dev->n_erased_blocks--;
+			yaffs_trace(YAFFS_TRACE_ALLOCATE,
+			  "Allocated block %d, seq  %d, %d left" ,
+			   dev->alloc_block_finder, dev->seq_number,
+			   dev->n_erased_blocks);
+			return dev->alloc_block_finder;
+		}
+	}
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs tragedy: no more erased blocks, but there should have been %d",
+		dev->n_erased_blocks);
+
+	return -1;
+}
+
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+			     struct yaffs_block_info **block_ptr)
+{
+	int ret_val;
+	struct yaffs_block_info *bi;
+
+	if (dev->alloc_block < 0) {
+		/* Get next block to allocate off */
+		dev->alloc_block = yaffs_find_alloc_block(dev);
+		dev->alloc_page = 0;
+	}
+
+	if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+		/* No space unless we're allowed to use the reserve. */
+		return -1;
+	}
+
+	if (dev->n_erased_blocks < dev->param.n_reserved_blocks
+	    && dev->alloc_page == 0)
+		yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
+
+	/* Next page please.... */
+	if (dev->alloc_block >= 0) {
+		bi = yaffs_get_block_info(dev, dev->alloc_block);
+
+		ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
+		    dev->alloc_page;
+		bi->pages_in_use++;
+		yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
+
+		dev->alloc_page++;
+
+		dev->n_free_chunks--;
+
+		/* If the block is full set the state to full */
+		if (dev->alloc_page >= (u32)dev->param.chunks_per_block) {
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
+
+		if (block_ptr)
+			*block_ptr = bi;
+
+		return ret_val;
+	}
+
+	yaffs_trace(YAFFS_TRACE_ERROR,
+		"!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
+
+	return -1;
+}
+
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+{
+	int n;
+
+	n = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+	if (dev->alloc_block > 0)
+		n += (dev->param.chunks_per_block - dev->alloc_page);
+
+	return n;
+
+}
+
+/*
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
+{
+	struct yaffs_block_info *bi;
+
+	if (dev->alloc_block > 0) {
+		bi = yaffs_get_block_info(dev, dev->alloc_block);
+		if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
+	}
+}
+
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+				 const u8 *data,
+				 struct yaffs_ext_tags *tags, int use_reserver)
+{
+	u32 attempts = 0;
+	int write_ok = 0;
+	int chunk;
+
+	yaffs2_checkpt_invalidate(dev);
+
+	do {
+		struct yaffs_block_info *bi = 0;
+		int erased_ok = 0;
+
+		chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
+		if (chunk < 0) {
+			/* no space */
+			break;
+		}
+
+		/* First check this chunk is erased, if it needs
+		 * checking.  The checking policy (unless forced
+		 * always on) is as follows:
+		 *
+		 * Check the first page we try to write in a block.
+		 * If the check passes then we don't need to check any
+		 * more.        If the check fails, we check again...
+		 * If the block has been erased, we don't need to check.
+		 *
+		 * However, if the block has been prioritised for gc,
+		 * then we think there might be something odd about
+		 * this block and stop using it.
+		 *
+		 * Rationale: We should only ever see chunks that have
+		 * not been erased if there was a partially written
+		 * chunk due to power loss.  This checking policy should
+		 * catch that case with very few checks and thus save a
+		 * lot of checks that are most likely not needed.
+		 *
+		 * Mods to the above
+		 * If an erase check fails or the write fails we skip the
+		 * rest of the block.
+		 */
+
+		/* let's give it a try */
+		attempts++;
+
+		if (dev->param.always_check_erased)
+			bi->skip_erased_check = 0;
+
+		if (!bi->skip_erased_check) {
+			erased_ok = yaffs_check_chunk_erased(dev, chunk);
+			if (erased_ok != YAFFS_OK) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+				  "**>> yaffs chunk %d was not erased",
+				  chunk);
+
+				/* If not erased, delete this one,
+				 * skip rest of block and
+				 * try another chunk */
+				yaffs_chunk_del(dev, chunk, 1, __LINE__);
+				yaffs_skip_rest_of_block(dev);
+				continue;
+			}
+		}
+
+		write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
+
+		if (!bi->skip_erased_check)
+			write_ok =
+			    yaffs_verify_chunk_written(dev, chunk, data, tags);
+
+		if (write_ok != YAFFS_OK) {
+			/* Clean up aborted write, skip to next block and
+			 * try another chunk */
+			yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
+			continue;
+		}
+
+		bi->skip_erased_check = 1;
+
+		/* Copy the data into the robustification buffer */
+		yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
+
+	} while (write_ok != YAFFS_OK &&
+		 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
+
+	if (!write_ok)
+		chunk = -1;
+
+	if (attempts > 1) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>> yaffs write required %d attempts",
+			attempts);
+		dev->n_retried_writes += (attempts - 1);
+	}
+
+	return chunk;
+}
+
+/*
+ * Block retiring for handling a broken block.
+ */
+
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+	yaffs2_checkpt_invalidate(dev);
+
+	yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+	if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
+		if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"yaffs: Failed to mark bad and erase block %d",
+				flash_block);
+		} else {
+			struct yaffs_ext_tags tags;
+			int chunk_id =
+			    flash_block * dev->param.chunks_per_block;
+
+			u8 *buffer = yaffs_get_temp_buffer(dev);
+
+			memset(buffer, 0xff, dev->data_bytes_per_chunk);
+			memset(&tags, 0, sizeof(tags));
+			tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
+			if (dev->tagger.write_chunk_tags_fn(dev, chunk_id -
+							dev->chunk_offset,
+							buffer,
+							&tags) != YAFFS_OK)
+				yaffs_trace(YAFFS_TRACE_ALWAYS,
+					"yaffs: Failed to write bad block marker to block %d",
+					flash_block);
+
+			yaffs_release_temp_buffer(dev, buffer);
+		}
+	}
+
+	bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+	bi->gc_prioritise = 0;
+	bi->needs_retiring = 0;
+
+	dev->n_retired_blocks++;
+}
+
+/*---------------- Name handling functions ------------*/
+
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
+				    const YCHAR *oh_name, int buff_size)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	if (dev->param.auto_unicode) {
+		if (*oh_name) {
+			/* It is an ASCII name, do an ASCII to
+			 * unicode conversion */
+			const char *ascii_oh_name = (const char *)oh_name;
+			int n = buff_size - 1;
+			while (n > 0 && *ascii_oh_name) {
+				*name = *ascii_oh_name;
+				name++;
+				ascii_oh_name++;
+				n--;
+			}
+		} else {
+			yaffs_strncpy(name, oh_name + 1, buff_size - 1);
+		}
+	} else {
+#else
+	(void) dev;
+	{
+#endif
+		yaffs_strncpy(name, oh_name, buff_size - 1);
+	}
+}
+
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
+				    const YCHAR *name)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+
+	int is_ascii;
+	const YCHAR *w;
+
+	if (dev->param.auto_unicode) {
+
+		is_ascii = 1;
+		w = name;
+
+		/* Figure out if the name will fit in ascii character set */
+		while (is_ascii && *w) {
+			if ((*w) & 0xff00)
+				is_ascii = 0;
+			w++;
+		}
+
+		if (is_ascii) {
+			/* It is an ASCII name, so convert unicode to ascii */
+			char *ascii_oh_name = (char *)oh_name;
+			int n = YAFFS_MAX_NAME_LENGTH - 1;
+			while (n > 0 && *name) {
+				*ascii_oh_name = *name;
+				name++;
+				ascii_oh_name++;
+				n--;
+			}
+		} else {
+			/* Unicode name, so save starting at the second YCHAR */
+			*oh_name = 0;
+			yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
+		}
+	} else {
+#else
+	dev = dev;
+	{
+#endif
+		yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
+	}
+}
+
+static u16 yaffs_calc_name_sum(const YCHAR *name)
+{
+	u16 sum = 0;
+	u16 i = 1;
+
+	if (!name)
+		return 0;
+
+	while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
+
+		/* 0x1f mask is case insensitive */
+		sum += ((*name) & 0x1f) * i;
+		i++;
+		name++;
+	}
+	return sum;
+}
+
+
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
+{
+	memset(obj->short_name, 0, sizeof(obj->short_name));
+
+	if (name && !name[0]) {
+		yaffs_fix_null_name(obj, obj->short_name,
+				YAFFS_SHORT_NAME_LENGTH);
+		name = obj->short_name;
+	} else if (name &&
+		yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
+		YAFFS_SHORT_NAME_LENGTH)  {
+		yaffs_strcpy(obj->short_name, name);
+	}
+
+	obj->sum = yaffs_calc_name_sum(name);
+}
+
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+				const struct yaffs_obj_hdr *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
+	memset(tmp_name, 0, sizeof(tmp_name));
+	yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
+				YAFFS_MAX_NAME_LENGTH + 1);
+	yaffs_set_obj_name(obj, tmp_name);
+#else
+	yaffs_set_obj_name(obj, oh->name);
+#endif
+}
+
+Y_LOFF_T yaffs_max_file_size(struct yaffs_dev *dev)
+{
+	if(sizeof(Y_LOFF_T) < 8)
+		return YAFFS_MAX_FILE_SIZE_32;
+	else
+		return ((Y_LOFF_T) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
+}
+
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
+{
+	struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
+
+	if (tn) {
+		memset(tn, 0, dev->tnode_size);
+		dev->n_tnodes++;
+	}
+
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+
+	return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+	yaffs_free_raw_tnode(dev, tn);
+	dev->n_tnodes--;
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
+
+static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
+{
+	yaffs_deinit_raw_tnodes_and_objs(dev);
+	dev->n_obj = 0;
+	dev->n_tnodes = 0;
+}
+
+static void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			unsigned pos, unsigned val)
+{
+	u32 *map = (u32 *) tn;
+	u32 bit_in_map;
+	u32 bit_in_word;
+	u32 word_in_map;
+	u32 mask;
+
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+	val >>= dev->chunk_grp_bits;
+
+	bit_in_map = pos * dev->tnode_width;
+	word_in_map = bit_in_map / 32;
+	bit_in_word = bit_in_map & (32 - 1);
+
+	mask = dev->tnode_mask << bit_in_word;
+
+	map[word_in_map] &= ~mask;
+	map[word_in_map] |= (mask & (val << bit_in_word));
+
+	if (dev->tnode_width > (32 - bit_in_word)) {
+		bit_in_word = (32 - bit_in_word);
+		word_in_map++;
+		mask =
+		    dev->tnode_mask >> bit_in_word;
+		map[word_in_map] &= ~mask;
+		map[word_in_map] |= (mask & (val >> bit_in_word));
+	}
+}
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			 unsigned pos)
+{
+	u32 *map = (u32 *) tn;
+	u32 bit_in_map;
+	u32 bit_in_word;
+	u32 word_in_map;
+	u32 val;
+
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+
+	bit_in_map = pos * dev->tnode_width;
+	word_in_map = bit_in_map / 32;
+	bit_in_word = bit_in_map & (32 - 1);
+
+	val = map[word_in_map] >> bit_in_word;
+
+	if (dev->tnode_width > (32 - bit_in_word)) {
+		bit_in_word = (32 - bit_in_word);
+		word_in_map++;
+		val |= (map[word_in_map] << bit_in_word);
+	}
+
+	val &= dev->tnode_mask;
+	val <<= dev->chunk_grp_bits;
+
+	return val;
+}
+
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of top_level
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+				       struct yaffs_file_var *file_struct,
+				       u32 chunk_id)
+{
+	struct yaffs_tnode *tn = file_struct->top;
+	u32 i;
+	int required_depth;
+	int level = file_struct->top_level;
+
+	(void) dev;
+
+	/* Check sane level and chunk Id */
+	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
+
+	if (chunk_id > YAFFS_MAX_CHUNK_ID)
+		return NULL;
+
+	/* First check we're tall enough (ie enough top_level) */
+
+	i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
+	while (i) {
+		i >>= YAFFS_TNODES_INTERNAL_BITS;
+		required_depth++;
+	}
+
+	if (required_depth > file_struct->top_level)
+		return NULL;	/* Not tall enough, so we can't find it */
+
+	/* Traverse down to level 0 */
+	while (level > 0 && tn) {
+		tn = tn->internal[(chunk_id >>
+				   (YAFFS_TNODES_LEVEL0_BITS +
+				    (level - 1) *
+				    YAFFS_TNODES_INTERNAL_BITS)) &
+				  YAFFS_TNODES_INTERNAL_MASK];
+		level--;
+	}
+
+	return tn;
+}
+
+/* add_find_tnode_0 finds the level 0 tnode if it exists,
+ * otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the
+ *  specified tn will be plugged into the ttree.
+ */
+
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+					   struct yaffs_file_var *file_struct,
+					   u32 chunk_id,
+					   struct yaffs_tnode *passed_tn)
+{
+	int required_depth;
+	int i;
+	int l;
+	struct yaffs_tnode *tn;
+	u32 x;
+
+	/* Check sane level and page Id */
+	if (file_struct->top_level < 0 ||
+	    file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
+
+	if (chunk_id > YAFFS_MAX_CHUNK_ID)
+		return NULL;
+
+	/* First check we're tall enough (ie enough top_level) */
+
+	x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
+	while (x) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		required_depth++;
+	}
+
+	if (required_depth > file_struct->top_level) {
+		/* Not tall enough, gotta make the tree taller */
+		for (i = file_struct->top_level; i < required_depth; i++) {
+
+			tn = yaffs_get_tnode(dev);
+
+			if (tn) {
+				tn->internal[0] = file_struct->top;
+				file_struct->top = tn;
+				file_struct->top_level++;
+			} else {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs: no more tnodes");
+				return NULL;
+			}
+		}
+	}
+
+	/* Traverse down to level 0, adding anything we need */
+
+	l = file_struct->top_level;
+	tn = file_struct->top;
+
+	if (l > 0) {
+		while (l > 0 && tn) {
+			x = (chunk_id >>
+			     (YAFFS_TNODES_LEVEL0_BITS +
+			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+			    YAFFS_TNODES_INTERNAL_MASK;
+
+			if ((l > 1) && !tn->internal[x]) {
+				/* Add missing non-level-zero tnode */
+				tn->internal[x] = yaffs_get_tnode(dev);
+				if (!tn->internal[x])
+					return NULL;
+			} else if (l == 1) {
+				/* Looking from level 1 at level 0 */
+				if (passed_tn) {
+					/* If we already have one, release it */
+					if (tn->internal[x])
+						yaffs_free_tnode(dev,
+							tn->internal[x]);
+					tn->internal[x] = passed_tn;
+
+				} else if (!tn->internal[x]) {
+					/* Don't have one, none passed in */
+					tn->internal[x] = yaffs_get_tnode(dev);
+					if (!tn->internal[x])
+						return NULL;
+				}
+			}
+
+			tn = tn->internal[x];
+			l--;
+		}
+	} else {
+		/* top is level 0 */
+		if (passed_tn) {
+			memcpy(tn, passed_tn,
+			       (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
+			yaffs_free_tnode(dev, passed_tn);
+		}
+	}
+
+	return tn;
+}
+
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, unsigned int obj_id,
+			    unsigned int chunk_obj)
+{
+	return (tags->chunk_id == chunk_obj &&
+		tags->obj_id == obj_id &&
+		!tags->is_deleted) ? 1 : 0;
+
+}
+
+static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
+					struct yaffs_ext_tags *tags, int obj_id,
+					int inode_chunk)
+{
+	int j;
+
+	for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
+		if (yaffs_check_chunk_bit
+		    (dev, the_chunk / dev->param.chunks_per_block,
+		     the_chunk % dev->param.chunks_per_block)) {
+
+			if (dev->chunk_grp_size == 1)
+				return the_chunk;
+			else {
+				if (!yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL, tags))
+				{
+					yaffs_trace(YAFFS_TRACE_ERROR, 	
+					    "yaffs_find_chunk_in_group: unhandled error from rd_chunk_tags_nand");
+				}
+				if (yaffs_tags_match(tags,
+							obj_id, inode_chunk)) {
+					/* found it; */
+					return the_chunk;
+				}
+			}
+		}
+		the_chunk++;
+	}
+	return -1;
+}
+
+int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+				    struct yaffs_ext_tags *tags)
+{
+	/*Get the Tnode, then get the level 0 offset chunk offset */
+	struct yaffs_tnode *tn;
+	int the_chunk = -1;
+	struct yaffs_ext_tags local_tags;
+	int ret_val = -1;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &local_tags;
+	}
+
+	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+	if (!tn)
+		return ret_val;
+
+	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+					      inode_chunk);
+	return ret_val;
+}
+
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+				     struct yaffs_ext_tags *tags)
+{
+	/* Get the Tnode, then get the level 0 offset chunk offset */
+	struct yaffs_tnode *tn;
+	int the_chunk = -1;
+	struct yaffs_ext_tags local_tags;
+	struct yaffs_dev *dev = in->my_dev;
+	int ret_val = -1;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &local_tags;
+	}
+
+	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+	if (!tn)
+		return ret_val;
+
+	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+					      inode_chunk);
+
+	/* Delete the entry in the filestructure (if found) */
+	if (ret_val != -1)
+		yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
+
+	return ret_val;
+}
+
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+			    int nand_chunk, int in_scan)
+{
+	/* NB in_scan is zero unless scanning.
+	 * For forward scanning, in_scan is > 0;
+	 * for backward scanning in_scan is < 0
+	 *
+	 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
+	 */
+
+	struct yaffs_tnode *tn;
+	struct yaffs_dev *dev = in->my_dev;
+	int existing_cunk;
+	struct yaffs_ext_tags existing_tags;
+	struct yaffs_ext_tags new_tags;
+	unsigned existing_serial, new_serial;
+
+	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
+		/* Just ignore an attempt at putting a chunk into a non-file
+		 * during scanning.
+		 * If it is not during Scanning then something went wrong!
+		 */
+		if (!in_scan) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy:attempt to put data chunk into a non-file"
+				);
+			BUG();
+		}
+
+		yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+		return YAFFS_OK;
+	}
+
+	tn = yaffs_add_find_tnode_0(dev,
+				    &in->variant.file_variant,
+				    inode_chunk, NULL);
+	if (!tn)
+		return YAFFS_FAIL;
+
+	if (!nand_chunk)
+		/* Dummy insert, bail now */
+		return YAFFS_OK;
+
+	existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+	if (in_scan != 0) {
+		/* If we're scanning then we need to test for duplicates
+		 * NB This does not need to be efficient since it should only
+		 * happen when the power fails during a write, then only one
+		 * chunk should ever be affected.
+		 *
+		 * Correction for YAFFS2: This could happen quite a lot and we
+		 * need to think about efficiency! TODO
+		 * Update: For backward scanning we don't need to re-read tags
+		 * so this is quite cheap.
+		 */
+
+		if (existing_cunk > 0) {
+			/* NB Right now existing chunk will not be real
+			 * chunk_id if the chunk group size > 1
+			 * thus we have to do a FindChunkInFile to get the
+			 * real chunk id.
+			 *
+			 * We have a duplicate now we need to decide which
+			 * one to use:
+			 *
+			 * Backwards scanning YAFFS2: The old one is what
+			 * we use, dump the new one.
+			 * YAFFS1: Get both sets of tags and compare serial
+			 * numbers.
+			 */
+
+			if (in_scan > 0) {
+				/* Only do this for forward scanning */
+				if (!yaffs_rd_chunk_tags_nand(dev,
+							 nand_chunk,
+							 NULL, &new_tags))
+		
+				{
+					yaffs_trace(YAFFS_TRACE_ERROR, "yaffs_put_chunk_in_file: unhandled error from rd_chunk_tags_nand");
+				}
+
+				/* Do a proper find */
+				existing_cunk =
+				    yaffs_find_chunk_in_file(in, inode_chunk,
+							     &existing_tags);
+			}
+
+			if (existing_cunk <= 0) {
+				/*Hoosterman - how did this happen? */
+
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs tragedy: existing chunk < 0 in scan"
+					);
+
+			}
+
+			/* NB The deleted flags should be false, otherwise
+			 * the chunks will not be loaded during a scan
+			 */
+
+			if (in_scan > 0) {
+				new_serial = new_tags.serial_number;
+				existing_serial = existing_tags.serial_number;
+			}
+
+			if ((in_scan > 0) &&
+			    (existing_cunk <= 0 ||
+			     ((existing_serial + 1) & 3) == new_serial)) {
+				/* Forward scanning.
+				 * Use new
+				 * Delete the old one and drop through to
+				 * update the tnode
+				 */
+				yaffs_chunk_del(dev, existing_cunk, 1,
+						__LINE__);
+			} else {
+				/* Backward scanning or we want to use the
+				 * existing one
+				 * Delete the new one and return early so that
+				 * the tnode isn't changed
+				 */
+				yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+				return YAFFS_OK;
+			}
+		}
+
+	}
+
+	if (existing_cunk == 0)
+		in->n_data_chunks++;
+
+	yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
+
+	return YAFFS_OK;
+}
+
+static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
+{
+	struct yaffs_block_info *the_block;
+	unsigned block_no;
+
+	yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
+
+	block_no = chunk / dev->param.chunks_per_block;
+	the_block = yaffs_get_block_info(dev, block_no);
+	if (the_block) {
+		the_block->soft_del_pages++;
+		dev->n_free_chunks++;
+		yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
+	}
+}
+
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
+ * the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls
+ * the chunk out of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks
+ * are soft deleted.
+ */
+
+static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
+				 u32 level, int chunk_offset)
+{
+	int i;
+	int the_chunk;
+	int all_done = 1;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (!tn)
+		return 1;
+
+	if (level > 0) {
+		for (i = YAFFS_NTNODES_INTERNAL - 1;
+			all_done && i >= 0;
+			i--) {
+			if (tn->internal[i]) {
+				all_done =
+				    yaffs_soft_del_worker(in,
+					tn->internal[i],
+					level - 1,
+					(chunk_offset <<
+					YAFFS_TNODES_INTERNAL_BITS)
+					+ i);
+				if (all_done) {
+					yaffs_free_tnode(dev,
+						tn->internal[i]);
+					tn->internal[i] = NULL;
+				} else {
+					/* Can this happen? */
+				}
+			}
+		}
+		return (all_done) ? 1 : 0;
+	}
+
+	/* level 0 */
+	 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+		the_chunk = yaffs_get_group_base(dev, tn, i);
+		if (the_chunk) {
+			yaffs_soft_del_chunk(dev, the_chunk);
+			yaffs_load_tnode_0(dev, tn, i, 0);
+		}
+	}
+	return 1;
+}
+
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	struct yaffs_obj *parent;
+
+	yaffs_verify_obj_in_dir(obj);
+	parent = obj->parent;
+
+	yaffs_verify_dir(parent);
+
+	if (dev && dev->param.remove_obj_fn)
+		dev->param.remove_obj_fn(obj);
+
+	list_del_init(&obj->siblings);
+	obj->parent = NULL;
+
+	yaffs_verify_dir(parent);
+}
+
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
+{
+	if (!directory) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: Trying to add an object to a null pointer directory"
+			);
+		BUG();
+		return;
+	}
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: Trying to add an object to a non-directory"
+			);
+		BUG();
+	}
+
+	if (obj->siblings.prev == NULL) {
+		/* Not initialised */
+		BUG();
+	}
+
+	yaffs_verify_dir(directory);
+
+	yaffs_remove_obj_from_dir(obj);
+
+	/* Now add it */
+	list_add(&obj->siblings, &directory->variant.dir_variant.children);
+	obj->parent = directory;
+
+	if (directory == obj->my_dev->unlinked_dir
+	    || directory == obj->my_dev->del_dir) {
+		obj->unlinked = 1;
+		obj->my_dev->n_unlinked_files++;
+		obj->rename_allowed = 0;
+	}
+
+	yaffs_verify_dir(directory);
+	yaffs_verify_obj_in_dir(obj);
+}
+
+static int yaffs_change_obj_name(struct yaffs_obj *obj,
+				 struct yaffs_obj *new_dir,
+				 const YCHAR *new_name, int force, int shadows)
+{
+	int unlink_op;
+	int del_op;
+	struct yaffs_obj *existing_target;
+
+	if (new_dir == NULL)
+		new_dir = obj->parent;	/* use the old directory */
+
+	if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_change_obj_name: new_dir is not a directory"
+			);
+		BUG();
+	}
+
+	unlink_op = (new_dir == obj->my_dev->unlinked_dir);
+	del_op = (new_dir == obj->my_dev->del_dir);
+
+	existing_target = yaffs_find_by_name(new_dir, new_name);
+
+	/* If the object is a file going into the unlinked directory,
+	 *   then it is OK to just stuff it in since duplicate names are OK.
+	 *   else only proceed if the new name does not exist and we're putting
+	 *   it into a directory.
+	 */
+	if (!(unlink_op || del_op || force ||
+	      shadows > 0 || !existing_target) ||
+	      new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		return YAFFS_FAIL;
+
+	yaffs_set_obj_name(obj, new_name);
+	obj->dirty = 1;
+	yaffs_add_obj_to_dir(new_dir, obj);
+
+	if (unlink_op)
+		obj->unlinked = 1;
+
+	/* If it is a deletion then we mark it as a shrink for gc  */
+	if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
+		return YAFFS_OK;
+
+	return YAFFS_FAIL;
+}
+
+/*------------------------ Short Operations Cache ------------------------------
+ *   In many situations where there is no high level buffering  a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance
+ *   benefit with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering and the short op cache
+ *   provides write buffering.
+ *
+ *   There are a small number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	int i;
+	struct yaffs_cache *cache;
+	int n_caches = obj->my_dev->param.n_caches;
+
+	for (i = 0; i < n_caches; i++) {
+		cache = &dev->cache[i];
+		if (cache->object == obj && cache->dirty)
+			return 1;
+	}
+
+	return 0;
+}
+
+static void yaffs_flush_single_cache(struct yaffs_cache *cache, int discard)
+{
+
+	if (!cache || cache->locked)
+		return;
+
+	/* Write it out and free it up  if need be.*/
+	if (cache->dirty) {
+		yaffs_wr_data_obj(cache->object,
+				  cache->chunk_id,
+				  cache->data,
+				  cache->n_bytes,
+				  1);
+
+		cache->dirty = 0;
+	}
+
+	if (discard)
+		cache->object = NULL;
+}
+
+static void yaffs_flush_file_cache(struct yaffs_obj *obj, int discard)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	int i;
+	struct yaffs_cache *cache;
+	int n_caches = obj->my_dev->param.n_caches;
+
+	if (n_caches < 1)
+		return;
+
+
+	/* Find the chunks for this object and flush them. */
+	for (i = 0; i < n_caches; i++) {
+		cache = &dev->cache[i];
+		if (cache->object == obj)
+			yaffs_flush_single_cache(cache, discard);
+	}
+
+}
+
+
+void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard)
+{
+	struct yaffs_obj *obj;
+	int n_caches = dev->param.n_caches;
+	int i;
+
+	/* Find a dirty object in the cache and flush it...
+	 * until there are no further dirty objects.
+	 */
+	do {
+		obj = NULL;
+		for (i = 0; i < n_caches && !obj; i++) {
+			if (dev->cache[i].object && dev->cache[i].dirty)
+				obj = dev->cache[i].object;
+		}
+		if (obj)
+			yaffs_flush_file_cache(obj, discard);
+	} while (obj);
+
+}
+
+/* Grab us an unused cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
+{
+	int i;
+
+	if (dev->param.n_caches > 0) {
+		for (i = 0; i < dev->param.n_caches; i++) {
+			if (!dev->cache[i].object)
+				return &dev->cache[i];
+		}
+	}
+
+	return NULL;
+}
+
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
+{
+	struct yaffs_cache *cache;
+	int usage;
+	int i;
+
+	if (dev->param.n_caches < 1)
+		return NULL;
+
+	/* First look for an unused cache */
+
+	cache = yaffs_grab_chunk_worker(dev);
+
+	if (cache)
+		return cache;
+
+	/*
+	 * Thery were all in use.
+	 * Find the LRU cache and flush it if it is dirty.
+	 */
+
+	usage = -1;
+	cache = NULL;
+
+	for (i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].object &&
+		    !dev->cache[i].locked &&
+		    (dev->cache[i].last_use < usage || !cache)) {
+				usage = dev->cache[i].last_use;
+				cache = &dev->cache[i];
+		}
+	}
+
+#if 1
+	yaffs_flush_single_cache(cache, 1);
+#else
+	yaffs_flush_file_cache(cache->object, 1);
+	cache = yaffs_grab_chunk_worker(dev);
+#endif
+
+	return cache;
+}
+
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+						  int chunk_id)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	int i;
+
+	if (dev->param.n_caches < 1)
+		return NULL;
+
+	for (i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].object == obj &&
+		    dev->cache[i].chunk_id == chunk_id) {
+			dev->cache_hits++;
+
+			return &dev->cache[i];
+		}
+	}
+	return NULL;
+}
+
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
+			    int is_write)
+{
+	int i;
+
+	if (dev->param.n_caches < 1)
+		return;
+
+	if (dev->cache_last_use < 0 ||
+		dev->cache_last_use > 100000000) {
+		/* Reset the cache usages */
+		for (i = 1; i < dev->param.n_caches; i++)
+			dev->cache[i].last_use = 0;
+
+		dev->cache_last_use = 0;
+	}
+	dev->cache_last_use++;
+	cache->last_use = dev->cache_last_use;
+
+	if (is_write)
+		cache->dirty = 1;
+}
+
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
+{
+	struct yaffs_cache *cache;
+
+	if (object->my_dev->param.n_caches > 0) {
+		cache = yaffs_find_chunk_cache(object, chunk_id);
+
+		if (cache)
+			cache->object = NULL;
+	}
+}
+
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
+{
+	int i;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (dev->param.n_caches > 0) {
+		/* Invalidate it. */
+		for (i = 0; i < dev->param.n_caches; i++) {
+			if (dev->cache[i].object == in)
+				dev->cache[i].object = NULL;
+		}
+	}
+}
+
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
+{
+	int bucket;
+	struct yaffs_dev *dev = obj->my_dev;
+
+	/* If it is still linked into the bucket list, free from the list */
+	if (!list_empty(&obj->hash_link)) {
+		list_del_init(&obj->hash_link);
+		bucket = yaffs_hash_fn(obj->obj_id);
+		dev->obj_bucket[bucket].count--;
+	}
+}
+
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_free_obj(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
+
+	if (!obj) {
+		BUG();
+		return;
+	}
+	dev = obj->my_dev;
+	yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
+		obj, obj->my_inode);
+	if (obj->parent)
+		BUG();
+	if (!list_empty(&obj->siblings))
+		BUG();
+
+	if (obj->my_inode) {
+		/* We're still hooked up to a cached inode.
+		 * Don't delete now, but mark for later deletion
+		 */
+		obj->defered_free = 1;
+		return;
+	}
+
+	yaffs_unhash_obj(obj);
+
+	yaffs_free_raw_obj(dev, obj);
+	dev->n_obj--;
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
+{
+	if (obj->defered_free)
+		yaffs_free_obj(obj);
+}
+
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
+{
+	/* Iinvalidate the file's data in the cache, without flushing. */
+	yaffs_invalidate_whole_cache(in);
+
+	if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
+		/* Move to unlinked directory so we have a deletion record */
+		yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
+				      0);
+	}
+
+	yaffs_remove_obj_from_dir(in);
+	yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
+	in->hdr_chunk = 0;
+
+	yaffs_free_obj(in);
+	return YAFFS_OK;
+
+}
+
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
+{
+	if (!obj->deleted ||
+	    obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
+	    obj->soft_del)
+		return;
+
+	if (obj->n_data_chunks <= 0) {
+		/* Empty file with no duplicate object headers,
+		 * just delete it immediately */
+		yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
+		obj->variant.file_variant.top = NULL;
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"yaffs: Deleting empty file %d",
+			obj->obj_id);
+		yaffs_generic_obj_del(obj);
+	} else {
+		yaffs_soft_del_worker(obj,
+				      obj->variant.file_variant.top,
+				      obj->variant.
+				      file_variant.top_level, 0);
+		obj->soft_del = 1;
+	}
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+					      struct yaffs_tnode *tn, u32 level,
+					      int del0)
+{
+	int i;
+	int has_data;
+
+	if (!tn)
+		return tn;
+
+	has_data = 0;
+
+	if (level > 0) {
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i]) {
+				tn->internal[i] =
+				    yaffs_prune_worker(dev,
+						tn->internal[i],
+						level - 1,
+						(i == 0) ? del0 : 1);
+			}
+
+			if (tn->internal[i])
+				has_data++;
+		}
+	} else {
+		int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+		u32 *map = (u32 *) tn;
+
+		for (i = 0; !has_data && i < tnode_size_u32; i++) {
+			if (map[i])
+				has_data++;
+		}
+	}
+
+	if (has_data == 0 && del0) {
+		/* Free and return NULL */
+		yaffs_free_tnode(dev, tn);
+		tn = NULL;
+	}
+	return tn;
+}
+
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+			    struct yaffs_file_var *file_struct)
+{
+	int i;
+	int has_data;
+	int done = 0;
+	struct yaffs_tnode *tn;
+
+	if (file_struct->top_level < 1)
+		return YAFFS_OK;
+
+	file_struct->top =
+	   yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
+
+	/* Now we have a tree with all the non-zero branches NULL but
+	 * the height is the same as it was.
+	 * Let's see if we can trim internal tnodes to shorten the tree.
+	 * We can do this if only the 0th element in the tnode is in use
+	 * (ie all the non-zero are NULL)
+	 */
+
+	while (file_struct->top_level && !done) {
+		tn = file_struct->top;
+
+		has_data = 0;
+		for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i])
+				has_data++;
+		}
+
+		if (!has_data) {
+			file_struct->top = tn->internal[0];
+			file_struct->top_level--;
+			yaffs_free_tnode(dev, tn);
+		} else {
+			done = 1;
+		}
+	}
+
+	return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* alloc_empty_obj gets us a clean Object.*/
+static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
+
+	if (!obj)
+		return obj;
+
+	dev->n_obj++;
+
+	/* Now sweeten it up... */
+
+	memset(obj, 0, sizeof(struct yaffs_obj));
+	obj->being_created = 1;
+
+	obj->my_dev = dev;
+	obj->hdr_chunk = 0;
+	obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
+	INIT_LIST_HEAD(&(obj->hard_links));
+	INIT_LIST_HEAD(&(obj->hash_link));
+	INIT_LIST_HEAD(&obj->siblings);
+
+	/* Now make the directory sane */
+	if (dev->root_dir) {
+		obj->parent = dev->root_dir;
+		list_add(&(obj->siblings),
+			 &dev->root_dir->variant.dir_variant.children);
+	}
+
+	/* Add it to the lost and found directory.
+	 * NB Can't put root or lost-n-found in lost-n-found so
+	 * check if lost-n-found exists first
+	 */
+	if (dev->lost_n_found)
+		yaffs_add_obj_to_dir(dev->lost_n_found, obj);
+
+	obj->being_created = 0;
+
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+
+	return obj;
+}
+
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
+{
+	int i;
+	int l = 999;
+	int lowest = 999999;
+
+	/* Search for the shortest list or one that
+	 * isn't too long.
+	 */
+
+	for (i = 0; i < 10 && lowest > 4; i++) {
+		dev->bucket_finder++;
+		dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
+			lowest = dev->obj_bucket[dev->bucket_finder].count;
+			l = dev->bucket_finder;
+		}
+	}
+
+	return l;
+}
+
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
+{
+	int bucket = yaffs_find_nice_bucket(dev);
+	int found = 0;
+	struct list_head *i;
+	u32 n = (u32) bucket;
+
+	/* Now find an object value that has not already been taken
+	 * by scanning the list.
+	 */
+
+	while (!found) {
+		found = 1;
+		n += YAFFS_NOBJECT_BUCKETS;
+		if (1 || dev->obj_bucket[bucket].count > 0) {
+			list_for_each(i, &dev->obj_bucket[bucket].list) {
+				/* If there is already one in the list */
+				if (i && list_entry(i, struct yaffs_obj,
+						    hash_link)->obj_id == n) {
+					found = 0;
+				}
+			}
+		}
+	}
+	return n;
+}
+
+static void yaffs_hash_obj(struct yaffs_obj *in)
+{
+	int bucket = yaffs_hash_fn(in->obj_id);
+	struct yaffs_dev *dev = in->my_dev;
+
+	list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+	dev->obj_bucket[bucket].count++;
+}
+
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
+{
+	int bucket = yaffs_hash_fn(number);
+	struct list_head *i;
+	struct yaffs_obj *in;
+
+	list_for_each(i, &dev->obj_bucket[bucket].list) {
+		/* Look if it is in the list */
+		in = list_entry(i, struct yaffs_obj, hash_link);
+		if (in->obj_id == number) {
+			/* Don't show if it is defered free */
+			if (in->defered_free)
+				return NULL;
+			return in;
+		}
+	}
+
+	return NULL;
+}
+
+static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+				enum yaffs_obj_type type)
+{
+	struct yaffs_obj *the_obj = NULL;
+	struct yaffs_tnode *tn = NULL;
+
+	if (number < 0)
+		number = yaffs_new_obj_id(dev);
+
+	if (type == YAFFS_OBJECT_TYPE_FILE) {
+		tn = yaffs_get_tnode(dev);
+		if (!tn)
+			return NULL;
+	}
+
+	the_obj = yaffs_alloc_empty_obj(dev);
+	if (!the_obj) {
+		if (tn)
+			yaffs_free_tnode(dev, tn);
+		return NULL;
+	}
+
+	the_obj->fake = 0;
+	the_obj->rename_allowed = 1;
+	the_obj->unlink_allowed = 1;
+	the_obj->obj_id = number;
+	yaffs_hash_obj(the_obj);
+	the_obj->variant_type = type;
+	yaffs_load_current_time(the_obj, 1, 1);
+
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		the_obj->variant.file_variant.file_size = 0;
+		the_obj->variant.file_variant.scanned_size = 0;
+		the_obj->variant.file_variant.shrink_size =
+						yaffs_max_file_size(dev);
+		the_obj->variant.file_variant.top_level = 0;
+		the_obj->variant.file_variant.top = tn;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
+		INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		/* No action required */
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* todo this should not happen */
+		break;
+	}
+	return the_obj;
+}
+
+static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
+					       int number, u32 mode)
+{
+
+	struct yaffs_obj *obj =
+	    yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+
+	if (!obj)
+		return NULL;
+
+	obj->fake = 1;	/* it is fake so it might not use NAND */
+	obj->rename_allowed = 0;
+	obj->unlink_allowed = 0;
+	obj->deleted = 0;
+	obj->unlinked = 0;
+	obj->yst_mode = mode;
+	obj->my_dev = dev;
+	obj->hdr_chunk = 0;	/* Not a valid chunk. */
+	return obj;
+
+}
+
+
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
+{
+	int i;
+
+	dev->n_obj = 0;
+	dev->n_tnodes = 0;
+	yaffs_init_raw_tnodes_and_objs(dev);
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		INIT_LIST_HEAD(&dev->obj_bucket[i].list);
+		dev->obj_bucket[i].count = 0;
+	}
+}
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+						 int number,
+						 enum yaffs_obj_type type)
+{
+	struct yaffs_obj *the_obj = NULL;
+
+	if (number > 0)
+		the_obj = yaffs_find_by_number(dev, number);
+
+	if (!the_obj)
+		the_obj = yaffs_new_obj(dev, number, type);
+
+	return the_obj;
+
+}
+
+YCHAR *yaffs_clone_str(const YCHAR *str)
+{
+	YCHAR *new_str = NULL;
+	int len;
+
+	if (!str)
+		str = _Y("");
+
+	len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
+	new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
+	if (new_str) {
+		yaffs_strncpy(new_str, str, len);
+		new_str[len] = 0;
+	}
+	return new_str;
+
+}
+/*
+ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_update_dirty_dirs must be
+ * called periodically.
+ */
+
+static void yaffs_update_parent(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
+
+	if (!obj)
+		return;
+	dev = obj->my_dev;
+	obj->dirty = 1;
+	yaffs_load_current_time(obj, 0, 1);
+	if (dev->param.defered_dir_update) {
+		struct list_head *link = &obj->variant.dir_variant.dirty;
+
+		if (list_empty(link)) {
+			list_add(link, &dev->dirty_dirs);
+			yaffs_trace(YAFFS_TRACE_BACKGROUND,
+			  "Added object %d to dirty directories",
+			   obj->obj_id);
+		}
+
+	} else {
+		yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+	}
+}
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
+{
+	struct list_head *link;
+	struct yaffs_obj *obj;
+	struct yaffs_dir_var *d_s;
+	union yaffs_obj_var *o_v;
+
+	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
+
+	while (!list_empty(&dev->dirty_dirs)) {
+		link = dev->dirty_dirs.next;
+		list_del_init(link);
+
+		d_s = list_entry(link, struct yaffs_dir_var, dirty);
+		o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
+		obj = list_entry(o_v, struct yaffs_obj, variant);
+
+		yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
+			obj->obj_id);
+
+		if (obj->dirty)
+			yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+	}
+}
+
+/*
+ * Mknod (create) a new object.
+ * equiv_obj only has meaning for a hard link;
+ * alias_str only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+
+static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
+					  struct yaffs_obj *parent,
+					  const YCHAR *name,
+					  u32 mode,
+					  u32 uid,
+					  u32 gid,
+					  struct yaffs_obj *equiv_obj,
+					  const YCHAR *alias_str, u32 rdev)
+{
+	struct yaffs_obj *in;
+	YCHAR *str = NULL;
+	struct yaffs_dev *dev = parent->my_dev;
+
+	/* Check if the entry exists.
+	 * If it does then fail the call since we don't want a dup. */
+	if (yaffs_find_by_name(parent, name))
+		return NULL;
+
+	if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		str = yaffs_clone_str(alias_str);
+		if (!str)
+			return NULL;
+	}
+
+	in = yaffs_new_obj(dev, -1, type);
+
+	if (!in) {
+		kfree(str);
+		return NULL;
+	}
+
+	in->hdr_chunk = 0;
+	in->valid = 1;
+	in->variant_type = type;
+
+	in->yst_mode = mode;
+
+	yaffs_attribs_init(in, gid, uid, rdev);
+
+	in->n_data_chunks = 0;
+
+	yaffs_set_obj_name(in, name);
+	in->dirty = 1;
+
+	yaffs_add_obj_to_dir(parent, in);
+
+	in->my_dev = parent->my_dev;
+
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		in->variant.symlink_variant.alias = str;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		in->variant.hardlink_variant.equiv_obj = equiv_obj;
+		in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
+		list_add(&in->hard_links, &equiv_obj->hard_links);
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* do nothing */
+		break;
+	}
+
+	if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+		/* Could not create the object header, fail */
+		yaffs_del_obj(in);
+		in = NULL;
+	}
+
+	if (in)
+		yaffs_update_parent(parent);
+
+	return in;
+}
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+				    const YCHAR *name, u32 mode, u32 uid,
+				    u32 gid)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+				uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
+				   u32 mode, u32 uid, u32 gid)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+				mode, uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, u32 rdev)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+				uid, gid, NULL, NULL, rdev);
+}
+
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, const YCHAR *alias)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+				uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_link_obj returns the object id of the equivalent object.*/
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+				 struct yaffs_obj *equiv_obj)
+{
+	/* Get the real object in case we were fed a hard link obj */
+	equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
+
+	if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
+			parent, name, 0, 0, 0,
+			equiv_obj, NULL, 0))
+		return equiv_obj;
+
+	return NULL;
+
+}
+
+
+
+/*---------------------- Block Management and Page Allocation -------------*/
+
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
+{
+	if (dev->block_info_alt && dev->block_info)
+		vfree(dev->block_info);
+	else
+		kfree(dev->block_info);
+
+	dev->block_info_alt = 0;
+
+	dev->block_info = NULL;
+
+	if (dev->chunk_bits_alt && dev->chunk_bits)
+		vfree(dev->chunk_bits);
+	else
+		kfree(dev->chunk_bits);
+	dev->chunk_bits_alt = 0;
+	dev->chunk_bits = NULL;
+}
+
+static int yaffs_init_blocks(struct yaffs_dev *dev)
+{
+	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+	dev->block_info = NULL;
+	dev->chunk_bits = NULL;
+	dev->alloc_block = -1;	/* force it to get a new one */
+
+	/* If the first allocation strategy fails, thry the alternate one */
+	dev->block_info =
+		kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
+	if (!dev->block_info) {
+		dev->block_info =
+		    vmalloc(n_blocks * sizeof(struct yaffs_block_info));
+		dev->block_info_alt = 1;
+	} else {
+		dev->block_info_alt = 0;
+	}
+
+	if (!dev->block_info)
+		goto alloc_error;
+
+	/* Set up dynamic blockinfo stuff. Round up bytes. */
+	dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
+	dev->chunk_bits =
+		kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
+	if (!dev->chunk_bits) {
+		dev->chunk_bits =
+		    vmalloc(dev->chunk_bit_stride * n_blocks);
+		dev->chunk_bits_alt = 1;
+	} else {
+		dev->chunk_bits_alt = 0;
+	}
+	if (!dev->chunk_bits)
+		goto alloc_error;
+
+
+	memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
+	memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
+	return YAFFS_OK;
+
+alloc_error:
+	yaffs_deinit_blocks(dev);
+	return YAFFS_FAIL;
+}
+
+
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+	int erased_ok = 0;
+	int i;
+
+	/* If the block is still healthy erase it and mark as clean.
+	 * If the block has had a data failure, then retire it.
+	 */
+
+	yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+		"yaffs_block_became_dirty block %d state %d %s",
+		block_no, bi->block_state,
+		(bi->needs_retiring) ? "needs retiring" : "");
+
+	yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+	bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
+
+	/* If this is the block being garbage collected then stop gc'ing */
+	if ((u32)block_no == dev->gc_block)
+		dev->gc_block = 0;
+
+	/* If this block is currently the best candidate for gc
+	 * then drop as a candidate */
+	if ((u32)block_no == dev->gc_dirtiest) {
+		dev->gc_dirtiest = 0;
+		dev->gc_pages_in_use = 0;
+	}
+
+	if (!bi->needs_retiring) {
+		yaffs2_checkpt_invalidate(dev);
+		erased_ok = yaffs_erase_block(dev, block_no);
+		if (!erased_ok) {
+			dev->n_erase_failures++;
+			yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			  "**>> Erasure failed %d", block_no);
+		}
+	}
+
+	/* Verify erasure if needed */
+	if (erased_ok &&
+	    ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
+	     !yaffs_skip_verification(dev))) {
+		for (i = 0; i < dev->param.chunks_per_block; i++) {
+			if (!yaffs_check_chunk_erased(dev,
+				block_no * dev->param.chunks_per_block + i)) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					">>Block %d erasure supposedly OK, but chunk %d not erased",
+					block_no, i);
+			}
+		}
+	}
+
+	if (!erased_ok) {
+		/* We lost a block of free space */
+		dev->n_free_chunks -= dev->param.chunks_per_block;
+		yaffs_retire_block(dev, block_no);
+		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			"**>> Block %d retired", block_no);
+		return;
+	}
+
+	/* Clean it up... */
+	bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+	bi->seq_number = 0;
+	dev->n_erased_blocks++;
+	bi->pages_in_use = 0;
+	bi->soft_del_pages = 0;
+	bi->has_shrink_hdr = 0;
+	bi->skip_erased_check = 1;	/* Clean, so no need to check */
+	bi->gc_prioritise = 0;
+	bi->has_summary = 0;
+
+	yaffs_clear_chunk_bits(dev, block_no);
+
+	yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
+}
+
+static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
+					struct yaffs_block_info *bi,
+					int old_chunk, u8 *buffer)
+{
+	int new_chunk;
+	int mark_flash = 1;
+	struct yaffs_ext_tags tags;
+	struct yaffs_obj *object;
+	int matching_chunk;
+	int ret_val = YAFFS_OK;
+
+	memset(&tags, 0, sizeof(tags));
+	if (!yaffs_rd_chunk_tags_nand(dev, old_chunk,
+				 buffer, &tags))
+
+	{
+		yaffs_trace(YAFFS_TRACE_ERROR, "yaffs_gc_process_chunk: unhandled error from rd_chunk_tags_nand");
+	}
+	object = yaffs_find_by_number(dev, tags.obj_id);
+
+	yaffs_trace(YAFFS_TRACE_GC_DETAIL,
+		"Collecting chunk in block %d, %d %d %d ",
+		dev->gc_chunk, tags.obj_id,
+		tags.chunk_id, tags.n_bytes);
+
+	if (object && !yaffs_skip_verification(dev)) {
+		if (tags.chunk_id == 0)
+			matching_chunk =
+			    object->hdr_chunk;
+		else if (object->soft_del)
+			/* Defeat the test */
+			matching_chunk = old_chunk;
+		else
+			matching_chunk =
+			    yaffs_find_chunk_in_file
+			    (object, tags.chunk_id,
+			     NULL);
+
+		if (old_chunk != matching_chunk)
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"gc: page in gc mismatch: %d %d %d %d",
+				old_chunk,
+				matching_chunk,
+				tags.obj_id,
+				tags.chunk_id);
+	}
+
+	if (!object) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"page %d in gc has no object: %d %d %d ",
+			old_chunk,
+			tags.obj_id, tags.chunk_id,
+			tags.n_bytes);
+	}
+
+	if (object &&
+	    object->deleted &&
+	    object->soft_del && tags.chunk_id != 0) {
+		/* Data chunk in a soft deleted file,
+		 * throw it away.
+		 * It's a soft deleted data chunk,
+		 * No need to copy this, just forget
+		 * about it and fix up the object.
+		 */
+
+		/* Free chunks already includes
+		 * softdeleted chunks, how ever this
+		 * chunk is going to soon be really
+		 * deleted which will increment free
+		 * chunks. We have to decrement free
+		 * chunks so this works out properly.
+		 */
+		dev->n_free_chunks--;
+		bi->soft_del_pages--;
+
+		object->n_data_chunks--;
+		if (object->n_data_chunks <= 0) {
+			/* remeber to clean up obj */
+			dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
+			dev->n_clean_ups++;
+		}
+		mark_flash = 0;
+	} else if (object) {
+		/* It's either a data chunk in a live
+		 * file or an ObjectHeader, so we're
+		 * interested in it.
+		 * NB Need to keep the ObjectHeaders of
+		 * deleted files until the whole file
+		 * has been deleted off
+		 */
+		tags.serial_number++;
+		dev->n_gc_copies++;
+
+		if (tags.chunk_id == 0) {
+			/* It is an object Id,
+			 * We need to nuke the
+			 * shrinkheader flags since its
+			 * work is done.
+			 * Also need to clean up
+			 * shadowing.
+			 */
+			struct yaffs_obj_hdr *oh;
+			oh = (struct yaffs_obj_hdr *) buffer;
+
+			oh->is_shrink = 0;
+			tags.extra_is_shrink = 0;
+			oh->shadows_obj = 0;
+			oh->inband_shadowed_obj_id = 0;
+			tags.extra_shadows = 0;
+
+			/* Update file size */
+			if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+				yaffs_oh_size_load(oh,
+				    object->variant.file_variant.file_size);
+				tags.extra_file_size =
+				    object->variant.file_variant.file_size;
+			}
+
+			yaffs_verify_oh(object, oh, &tags, 1);
+			new_chunk =
+			    yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
+		} else {
+			new_chunk =
+			    yaffs_write_new_chunk(dev, buffer, &tags, 1);
+		}
+
+		if (new_chunk < 0) {
+			ret_val = YAFFS_FAIL;
+		} else {
+
+			/* Now fix up the Tnodes etc. */
+
+			if (tags.chunk_id == 0) {
+				/* It's a header */
+				object->hdr_chunk = new_chunk;
+				object->serial = tags.serial_number;
+			} else {
+				/* It's a data chunk */
+				yaffs_put_chunk_in_file(object, tags.chunk_id,
+							new_chunk, 0);
+			}
+		}
+	}
+	if (ret_val == YAFFS_OK)
+		yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
+	return ret_val;
+}
+
+static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
+{
+	int old_chunk;
+	int ret_val = YAFFS_OK;
+	u32 i;
+	int is_checkpt_block;
+	int max_copies;
+	int chunks_before = yaffs_get_erased_chunks(dev);
+	int chunks_after;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
+
+	is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
+
+	yaffs_trace(YAFFS_TRACE_TRACING,
+		"Collecting block %d, in use %d, shrink %d, whole_block %d",
+		block, bi->pages_in_use, bi->has_shrink_hdr,
+		whole_block);
+
+	/*yaffs_verify_free_chunks(dev); */
+
+	if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
+		bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
+
+	bi->has_shrink_hdr = 0;	/* clear the flag so that the block can erase */
+
+	dev->gc_disable = 1;
+
+	yaffs_summary_gc(dev, block);
+
+	if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"Collecting block %d that has no chunks in use",
+			block);
+		yaffs_block_became_dirty(dev, block);
+	} else {
+
+		u8 *buffer = yaffs_get_temp_buffer(dev);
+
+		yaffs_verify_blk(dev, bi, block);
+
+		max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
+		old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
+
+		for (/* init already done */ ;
+		     ret_val == YAFFS_OK &&
+		     dev->gc_chunk < (u32)dev->param.chunks_per_block &&
+		     (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
+		     max_copies > 0;
+		     dev->gc_chunk++, old_chunk++) {
+			if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+				/* Page is in use and might need to be copied */
+				max_copies--;
+				ret_val = yaffs_gc_process_chunk(dev, bi,
+							old_chunk, buffer);
+			}
+		}
+		yaffs_release_temp_buffer(dev, buffer);
+	}
+
+	yaffs_verify_collected_blk(dev, bi, block);
+
+	if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+		/*
+		 * The gc did not complete. Set block state back to FULL
+		 * because checkpointing does not restore gc.
+		 */
+		bi->block_state = YAFFS_BLOCK_STATE_FULL;
+	} else {
+		/* The gc completed. */
+		/* Do any required cleanups */
+		for (i = 0; i < dev->n_clean_ups; i++) {
+			/* Time to delete the file too */
+			struct yaffs_obj *object =
+			    yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
+			if (object) {
+				yaffs_free_tnode(dev,
+					  object->variant.file_variant.top);
+				object->variant.file_variant.top = NULL;
+				yaffs_trace(YAFFS_TRACE_GC,
+					"yaffs: About to finally delete object %d",
+					object->obj_id);
+				yaffs_generic_obj_del(object);
+				object->my_dev->n_deleted_files--;
+			}
+
+		}
+		chunks_after = yaffs_get_erased_chunks(dev);
+		if (chunks_before >= chunks_after)
+			yaffs_trace(YAFFS_TRACE_GC,
+				"gc did not increase free chunks before %d after %d",
+				chunks_before, chunks_after);
+		dev->gc_block = 0;
+		dev->gc_chunk = 0;
+		dev->n_clean_ups = 0;
+	}
+
+	dev->gc_disable = 0;
+
+	return ret_val;
+}
+
+/*
+ * find_gc_block() selects the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
+				    int aggressive, int background)
+{
+	int i;
+	int iterations;
+	unsigned selected = 0;
+	int prioritised = 0;
+	int prioritised_exist = 0;
+	struct yaffs_block_info *bi;
+	int threshold;
+
+	/* First let's see if we need to grab a prioritised block */
+	if (dev->has_pending_prioritised_gc && !aggressive) {
+		dev->gc_dirtiest = 0;
+		bi = dev->block_info;
+		for (i = dev->internal_start_block;
+		     i <= dev->internal_end_block && !selected; i++) {
+
+			if (bi->gc_prioritise) {
+				prioritised_exist = 1;
+				if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+				    yaffs_block_ok_for_gc(dev, bi)) {
+					selected = i;
+					prioritised = 1;
+				}
+			}
+			bi++;
+		}
+
+		/*
+		 * If there is a prioritised block and none was selected then
+		 * this happened because there is at least one old dirty block
+		 * gumming up the works. Let's gc the oldest dirty block.
+		 */
+
+		if (prioritised_exist &&
+		    !selected && dev->oldest_dirty_block > 0)
+			selected = dev->oldest_dirty_block;
+
+		if (!prioritised_exist)	/* None found, so we can clear this */
+			dev->has_pending_prioritised_gc = 0;
+	}
+
+	/* If we're doing aggressive GC then we are happy to take a less-dirty
+	 * block, and search harder.
+	 * else (leasurely gc), then we only bother to do this if the
+	 * block has only a few pages in use.
+	 */
+
+	if (!selected) {
+		int pages_used;
+		int n_blocks =
+		    dev->internal_end_block - dev->internal_start_block + 1;
+		if (aggressive) {
+			threshold = dev->param.chunks_per_block;
+			iterations = n_blocks;
+		} else {
+			int max_threshold;
+
+			if (background)
+				max_threshold = dev->param.chunks_per_block / 2;
+			else
+				max_threshold = dev->param.chunks_per_block / 8;
+
+			if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+				max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+
+			threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
+			if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+				threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+			if (threshold > max_threshold)
+				threshold = max_threshold;
+
+			iterations = n_blocks / 16 + 1;
+			if (iterations > 100)
+				iterations = 100;
+		}
+
+		for (i = 0;
+		     i < iterations &&
+		     (dev->gc_dirtiest < 1 ||
+		      dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
+		     i++) {
+			dev->gc_block_finder++;
+			if (dev->gc_block_finder < (u32)dev->internal_start_block ||
+			    (int)dev->gc_block_finder > dev->internal_end_block)
+				dev->gc_block_finder =
+				    dev->internal_start_block;
+
+			bi = yaffs_get_block_info(dev, dev->gc_block_finder);
+
+			pages_used = bi->pages_in_use - bi->soft_del_pages;
+
+			if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+			    pages_used < dev->param.chunks_per_block &&
+			    (dev->gc_dirtiest < 1 ||
+			     pages_used < (int)dev->gc_pages_in_use) &&
+			    yaffs_block_ok_for_gc(dev, bi)) {
+				dev->gc_dirtiest = dev->gc_block_finder;
+				dev->gc_pages_in_use = pages_used;
+			}
+		}
+
+		if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= (u32)threshold)
+			selected = dev->gc_dirtiest;
+	}
+
+	/*
+	 * If nothing has been selected for a while, try the oldest dirty
+	 * because that's gumming up the works.
+	 */
+
+	if (!selected && dev->param.is_yaffs2 &&
+	    dev->gc_not_done >= (background ? 10 : 20)) {
+		yaffs2_find_oldest_dirty_seq(dev);
+		if (dev->oldest_dirty_block > 0) {
+			selected = dev->oldest_dirty_block;
+			dev->gc_dirtiest = selected;
+			dev->oldest_dirty_gc_count++;
+			bi = yaffs_get_block_info(dev, selected);
+			dev->gc_pages_in_use =
+			    bi->pages_in_use - bi->soft_del_pages;
+		} else {
+			dev->gc_not_done = 0;
+		}
+	}
+
+	if (selected) {
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC Selected block %d with %d free, prioritised:%d",
+			selected,
+			dev->param.chunks_per_block - dev->gc_pages_in_use,
+			prioritised);
+
+		dev->n_gc_blocks++;
+		if (background)
+			dev->bg_gcs++;
+
+		dev->gc_dirtiest = 0;
+		dev->gc_pages_in_use = 0;
+		dev->gc_not_done = 0;
+		if (dev->refresh_skip > 0)
+			dev->refresh_skip--;
+	} else {
+		dev->gc_not_done++;
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
+			dev->gc_block_finder, dev->gc_not_done, threshold,
+			dev->gc_dirtiest, dev->gc_pages_in_use,
+			dev->oldest_dirty_block, background ? " bg" : "");
+	}
+
+	return selected;
+}
+
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and only accepts more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_check_gc(struct yaffs_dev *dev, int background)
+{
+	int aggressive = 0;
+	int gc_ok = YAFFS_OK;
+	int max_tries = 0;
+	int min_erased;
+	int erased_chunks;
+	int checkpt_block_adjust;
+
+	if (dev->param.gc_control_fn &&
+		(dev->param.gc_control_fn(dev) & 1) == 0)
+		return YAFFS_OK;
+
+	if (dev->gc_disable)
+		/* Bail out so we don't get recursive gc */
+		return YAFFS_OK;
+
+	/* This loop should pass the first time.
+	 * Only loops here if the collection does not increase space.
+	 */
+
+	do {
+		max_tries++;
+
+		checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
+
+		min_erased =
+		    dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
+		erased_chunks =
+		    dev->n_erased_blocks * dev->param.chunks_per_block;
+
+		/* If we need a block soon then do aggressive gc. */
+		if (dev->n_erased_blocks < min_erased)
+			aggressive = 1;
+		else {
+			if (!background
+			    && erased_chunks > (dev->n_free_chunks / 4))
+				break;
+
+			if (dev->gc_skip > 20)
+				dev->gc_skip = 20;
+			if (erased_chunks < dev->n_free_chunks / 2 ||
+			    dev->gc_skip < 1 || background)
+				aggressive = 0;
+			else {
+				dev->gc_skip--;
+				break;
+			}
+		}
+
+		dev->gc_skip = 5;
+
+		/* If we don't already have a block being gc'd then see if we
+		 * should start another */
+
+		if (dev->gc_block < 1 && !aggressive) {
+			dev->gc_block = yaffs2_find_refresh_block(dev);
+			dev->gc_chunk = 0;
+			dev->n_clean_ups = 0;
+		}
+		if (dev->gc_block < 1) {
+			dev->gc_block =
+			    yaffs_find_gc_block(dev, aggressive, background);
+			dev->gc_chunk = 0;
+			dev->n_clean_ups = 0;
+		}
+
+		if (dev->gc_block > 0) {
+			dev->all_gcs++;
+			if (!aggressive)
+				dev->passive_gc_count++;
+
+			yaffs_trace(YAFFS_TRACE_GC,
+				"yaffs: GC n_erased_blocks %d aggressive %d",
+				dev->n_erased_blocks, aggressive);
+
+			gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
+		}
+
+		if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
+		    dev->gc_block > 0) {
+			yaffs_trace(YAFFS_TRACE_GC,
+				"yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
+				dev->n_erased_blocks, max_tries,
+				dev->gc_block);
+		}
+	} while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
+		 (dev->gc_block > 0) && (max_tries < 2));
+
+	return aggressive ? gc_ok : YAFFS_OK;
+}
+
+/*
+ * yaffs_bg_gc()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
+{
+	int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
+
+	yaffs_check_gc(dev, 1);
+	return erased_chunks > dev->n_free_chunks / 2;
+}
+
+/*-------------------- Data file manipulation -----------------*/
+
+static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
+{
+	int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
+
+	if (nand_chunk >= 0)
+		return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
+						buffer, NULL);
+	else {
+		yaffs_trace(YAFFS_TRACE_NANDACCESS,
+			"Chunk %d not found zero instead",
+			nand_chunk);
+		/* get sane (zero) data if you read a hole */
+		memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
+		return 0;
+	}
+
+}
+
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+		     int lyn)
+{
+	int block;
+	int page;
+	struct yaffs_ext_tags tags;
+	struct yaffs_block_info *bi;
+
+	if (chunk_id <= 0)
+		return;
+
+	dev->n_deletions++;
+	block = chunk_id / dev->param.chunks_per_block;
+	page = chunk_id % dev->param.chunks_per_block;
+
+	if (!yaffs_check_chunk_bit(dev, block, page))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Deleting invalid chunk %d", chunk_id);
+
+	bi = yaffs_get_block_info(dev, block);
+
+	yaffs2_update_oldest_dirty_seq(dev, block, bi);
+
+	yaffs_trace(YAFFS_TRACE_DELETION,
+		"line %d delete of chunk %d",
+		lyn, chunk_id);
+
+	if (!dev->param.is_yaffs2 && mark_flash &&
+	    bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
+
+		memset(&tags, 0, sizeof(tags));
+		tags.is_deleted = 1;
+		yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
+		yaffs_handle_chunk_update(dev, chunk_id, &tags);
+	} else {
+		dev->n_unmarked_deletions++;
+	}
+
+	/* Pull out of the management area.
+	 * If the whole block became dirty, this will kick off an erasure.
+	 */
+	if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
+	    bi->block_state == YAFFS_BLOCK_STATE_FULL ||
+	    bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+	    bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+		dev->n_free_chunks++;
+		yaffs_clear_chunk_bit(dev, block, page);
+		bi->pages_in_use--;
+
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
+		    bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			yaffs_block_became_dirty(dev, block);
+		}
+	}
+}
+
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+			     const u8 *buffer, int n_bytes, int use_reserve)
+{
+	/* Find old chunk Need to do this to get serial number
+	 * Write new one and patch into tree.
+	 * Invalidate old tags.
+	 */
+
+	int prev_chunk_id;
+	struct yaffs_ext_tags prev_tags;
+	int new_chunk_id;
+	struct yaffs_ext_tags new_tags;
+	struct yaffs_dev *dev = in->my_dev;
+
+	yaffs_check_gc(dev, 0);
+
+	/* Get the previous chunk at this location in the file if it exists.
+	 * If it does not exist then put a zero into the tree. This creates
+	 * the tnode now, rather than later when it is harder to clean up.
+	 */
+	prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
+	if (prev_chunk_id < 1 &&
+	    !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
+		return 0;
+
+	/* Set up new tags */
+	memset(&new_tags, 0, sizeof(new_tags));
+
+	new_tags.chunk_id = inode_chunk;
+	new_tags.obj_id = in->obj_id;
+	new_tags.serial_number =
+	    (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
+	new_tags.n_bytes = n_bytes;
+
+	if (n_bytes < 1 || (u32)n_bytes > dev->param.total_bytes_per_chunk) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+		  "Writing %d bytes to chunk!!!!!!!!!",
+		   n_bytes);
+		BUG();
+	}
+
+	new_chunk_id =
+	    yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
+
+	if (new_chunk_id > 0) {
+		yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
+
+		if (prev_chunk_id > 0)
+			yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+
+		yaffs_verify_file_sane(in);
+	}
+	return new_chunk_id;
+
+}
+
+
+
+static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
+				const YCHAR *name, const void *value, int size,
+				int flags)
+{
+	struct yaffs_xattr_mod xmod;
+	int result;
+
+	xmod.set = set;
+	xmod.name = name;
+	xmod.data = value;
+	xmod.size = size;
+	xmod.flags = flags;
+	xmod.result = -ENOSPC;
+
+	result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
+
+	if (result > 0)
+		return xmod.result;
+	else
+		return -ENOSPC;
+}
+
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+				   struct yaffs_xattr_mod *xmod)
+{
+	int retval = 0;
+	int x_offs = sizeof(struct yaffs_obj_hdr);
+	struct yaffs_dev *dev = obj->my_dev;
+	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+	char *x_buffer = buffer + x_offs;
+
+	if (xmod->set)
+		retval =
+		    nval_set(x_buffer, x_size, xmod->name, xmod->data,
+			     xmod->size, xmod->flags);
+	else
+		retval = nval_del(x_buffer, x_size, xmod->name);
+
+	obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+	obj->xattr_known = 1;
+	xmod->result = retval;
+
+	return retval;
+}
+
+static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
+				  void *value, int size)
+{
+	char *buffer = NULL;
+	int result;
+	struct yaffs_ext_tags tags;
+	struct yaffs_dev *dev = obj->my_dev;
+	int x_offs = sizeof(struct yaffs_obj_hdr);
+	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+	char *x_buffer;
+	int retval = 0;
+
+	if (obj->hdr_chunk < 1)
+		return -ENODATA;
+
+	/* If we know that the object has no xattribs then don't do all the
+	 * reading and parsing.
+	 */
+	if (obj->xattr_known && !obj->has_xattr) {
+		if (name)
+			return -ENODATA;
+		else
+			return 0;
+	}
+
+	buffer = (char *)yaffs_get_temp_buffer(dev);
+	if (!buffer)
+		return -ENOMEM;
+
+	result =
+	    yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
+
+	if (result != YAFFS_OK)
+		retval = -ENOENT;
+	else {
+		x_buffer = buffer + x_offs;
+
+		if (!obj->xattr_known) {
+			obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+			obj->xattr_known = 1;
+		}
+
+		if (name)
+			retval = nval_get(x_buffer, x_size, name, value, size);
+		else
+			retval = nval_list(x_buffer, x_size, value, size);
+	}
+	yaffs_release_temp_buffer(dev, (u8 *) buffer);
+	return retval;
+}
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+		      const void *value, int size, int flags)
+{
+	return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
+}
+
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
+{
+	return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
+}
+
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+		      int size)
+{
+	return yaffs_do_xattrib_fetch(obj, name, value, size);
+}
+
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
+{
+	return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
+}
+
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
+{
+	u8 *buf;
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_dev *dev;
+	struct yaffs_ext_tags tags;
+	//int result;
+	//int alloc_failed = 0;
+
+	if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
+		return;
+
+	dev = in->my_dev;
+	in->lazy_loaded = 0;
+	buf = yaffs_get_temp_buffer(dev);
+
+	if (!yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags))
+	{
+		yaffs_trace(YAFFS_TRACE_ERROR, "yaffs_check_obj_details_loaded: unhandled error from rd_chunk_tags_nand");
+	}
+	oh = (struct yaffs_obj_hdr *)buf;
+
+	in->yst_mode = oh->yst_mode;
+	yaffs_load_attribs(in, oh);
+	yaffs_set_obj_name_from_oh(in, oh);
+
+	if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		in->variant.symlink_variant.alias =
+		    yaffs_clone_str(oh->alias);
+		if (!in->variant.symlink_variant.alias)
+		{
+		//	alloc_failed = 1;
+		    yaffs_trace(YAFFS_TRACE_ERROR, "yaffs_check_obj_details_loaded: alloc_failed = 1??");
+		}
+	}
+	yaffs_release_temp_buffer(dev, buf);
+}
+
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
+		    int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
+{
+
+	struct yaffs_block_info *bi;
+	struct yaffs_dev *dev = in->my_dev;
+	int prev_chunk_id;
+	int ret_val = 0;
+	//int result = 0;
+	int new_chunk_id;
+	struct yaffs_ext_tags new_tags;
+	struct yaffs_ext_tags old_tags;
+	const YCHAR *alias = NULL;
+	u8 *buffer = NULL;
+	YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
+	struct yaffs_obj_hdr *oh = NULL;
+	Y_LOFF_T file_size = 0;
+
+	yaffs_strcpy(old_name, _Y("silly old name"));
+
+	if (in->fake && in != dev->root_dir && !force && !xmod)
+		return ret_val;
+
+	yaffs_check_gc(dev, 0);
+	yaffs_check_obj_details_loaded(in);
+
+	buffer = yaffs_get_temp_buffer(in->my_dev);
+	oh = (struct yaffs_obj_hdr *)buffer;
+
+	prev_chunk_id = in->hdr_chunk;
+
+	if (prev_chunk_id > 0) {
+		if (!yaffs_rd_chunk_tags_nand(dev, prev_chunk_id, buffer, &old_tags))
+		{
+		    yaffs_trace(YAFFS_TRACE_ERROR, "yaffs_update_oh: unhandled error from rd_chunk_tags_nand");
+		}
+
+		yaffs_verify_oh(in, oh, &old_tags, 0);
+		memcpy(old_name, oh->name, sizeof(oh->name));
+		memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
+	} else {
+		memset(buffer, 0xff, dev->data_bytes_per_chunk);
+	}
+
+	oh->type = in->variant_type;
+	oh->yst_mode = in->yst_mode;
+	oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
+
+	yaffs_load_attribs_oh(oh, in);
+
+	if (in->parent)
+		oh->parent_obj_id = in->parent->obj_id;
+	else
+		oh->parent_obj_id = 0;
+
+	if (name && *name) {
+		memset(oh->name, 0, sizeof(oh->name));
+		yaffs_load_oh_from_name(dev, oh->name, name);
+	} else if (prev_chunk_id > 0) {
+		memcpy(oh->name, old_name, sizeof(oh->name));
+	} else {
+		memset(oh->name, 0, sizeof(oh->name));
+	}
+
+	oh->is_shrink = is_shrink;
+
+	switch (in->variant_type) {
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* Should not happen */
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+		if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
+		    oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
+			file_size = in->variant.file_variant.file_size;
+		yaffs_oh_size_load(oh, file_size);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		oh->equiv_id = in->variant.hardlink_variant.equiv_id;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		/* Do nothing */
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		/* Do nothing */
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = in->variant.symlink_variant.alias;
+		if (!alias)
+			alias = _Y("no alias");
+		yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
+		oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+		break;
+	}
+
+	/* process any xattrib modifications */
+	if (xmod)
+		yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
+
+	/* Tags */
+	memset(&new_tags, 0, sizeof(new_tags));
+	in->serial++;
+	new_tags.chunk_id = 0;
+	new_tags.obj_id = in->obj_id;
+	new_tags.serial_number = in->serial;
+
+	/* Add extra info for file header */
+	new_tags.extra_available = 1;
+	new_tags.extra_parent_id = oh->parent_obj_id;
+	new_tags.extra_file_size = file_size;
+	new_tags.extra_is_shrink = oh->is_shrink;
+	new_tags.extra_equiv_id = oh->equiv_id;
+	new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
+	new_tags.extra_obj_type = in->variant_type;
+	yaffs_verify_oh(in, oh, &new_tags, 1);
+
+	/* Create new chunk in NAND */
+	new_chunk_id =
+	    yaffs_write_new_chunk(dev, buffer, &new_tags,
+				  (prev_chunk_id > 0) ? 1 : 0);
+
+	if (buffer)
+		yaffs_release_temp_buffer(dev, buffer);
+
+	if (new_chunk_id < 0)
+		return new_chunk_id;
+
+	in->hdr_chunk = new_chunk_id;
+
+	if (prev_chunk_id > 0)
+		yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+
+	if (!yaffs_obj_cache_dirty(in))
+		in->dirty = 0;
+
+	/* If this was a shrink, then mark the block
+	 * that the chunk lives on */
+	if (is_shrink) {
+		bi = yaffs_get_block_info(in->my_dev,
+					  new_chunk_id /
+					  in->my_dev->param.chunks_per_block);
+		bi->has_shrink_hdr = 1;
+	}
+
+
+	return new_chunk_id;
+}
+
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
+
+int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, Y_LOFF_T offset, int n_bytes)
+{
+	int chunk;
+	u32 start;
+	int n_copy;
+	int n = n_bytes;
+	int n_done = 0;
+	struct yaffs_cache *cache;
+	struct yaffs_dev *dev;
+
+	dev = in->my_dev;
+
+	while (n > 0) {
+		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+		if ((start + n) < (u32)dev->data_bytes_per_chunk)
+			n_copy = n;
+		else
+			n_copy = dev->data_bytes_per_chunk - start;
+
+		cache = yaffs_find_chunk_cache(in, chunk);
+
+		/* If the chunk is already in the cache or it is less than
+		 * a whole chunk or we're using inband tags then use the cache
+		 * (if there is caching) else bypass the cache.
+		 */
+		if (cache || n_copy != dev->data_bytes_per_chunk ||
+		    dev->param.inband_tags) {
+			if (dev->param.n_caches > 0) {
+
+				/* If we can't find the data in the cache,
+				 * then load it up. */
+
+				if (!cache) {
+					cache =
+					    yaffs_grab_chunk_cache(in->my_dev);
+					cache->object = in;
+					cache->chunk_id = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_rd_data_obj(in, chunk,
+							  cache->data);
+					cache->n_bytes = 0;
+				}
+
+				yaffs_use_cache(dev, cache, 0);
+
+				cache->locked = 1;
+
+				memcpy(buffer, &cache->data[start], n_copy);
+
+				cache->locked = 0;
+			} else {
+				/* Read into the local buffer then copy.. */
+
+				u8 *local_buffer =
+				    yaffs_get_temp_buffer(dev);
+				yaffs_rd_data_obj(in, chunk, local_buffer);
+
+				memcpy(buffer, &local_buffer[start], n_copy);
+
+				yaffs_release_temp_buffer(dev, local_buffer);
+			}
+		} else {
+			/* A full chunk. Read directly into the buffer. */
+			yaffs_rd_data_obj(in, chunk, buffer);
+		}
+		n -= n_copy;
+		offset += n_copy;
+		buffer += n_copy;
+		n_done += n_copy;
+	}
+	return n_done;
+}
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, Y_LOFF_T offset,
+		     int n_bytes, int write_through)
+{
+
+	int chunk;
+	u32 start;
+	int n_copy;
+	int n = n_bytes;
+	int n_done = 0;
+	int n_writeback;
+	Y_LOFF_T start_write = offset;
+	int chunk_written = 0;
+	u32 n_bytes_read;
+	Y_LOFF_T chunk_start;
+	struct yaffs_dev *dev;
+
+	dev = in->my_dev;
+
+	while (n > 0 && chunk_written >= 0) {
+		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+
+		if (((Y_LOFF_T)chunk) *
+		    (s32)(dev->data_bytes_per_chunk + start) != offset ||
+		    (s32)start >= dev->data_bytes_per_chunk) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"AddrToChunk of offset %ud gives chunk %d start %d",
+				(unsigned int)offset, chunk, start);
+		}
+		chunk++;	/* File pos to chunk in file offset */
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+
+		if ((start + n) < (u32)dev->data_bytes_per_chunk) {
+			n_copy = n;
+
+			/* Now calculate how many bytes to write back....
+			 * If we're overwriting and not writing to then end of
+			 * file then we need to write back as much as was there
+			 * before.
+			 */
+
+			chunk_start = (((Y_LOFF_T)(chunk - 1)) *
+					dev->data_bytes_per_chunk);
+
+			if (chunk_start > in->variant.file_variant.file_size)
+				n_bytes_read = 0;	/* Past end of file */
+			else
+				n_bytes_read =
+				    in->variant.file_variant.file_size -
+				    chunk_start;
+
+			if ((int)n_bytes_read > dev->data_bytes_per_chunk)
+				n_bytes_read = dev->data_bytes_per_chunk;
+
+			n_writeback =
+			    (n_bytes_read >
+			     (start + n)) ? n_bytes_read : (start + n);
+
+			if (n_writeback < 0 ||
+			    n_writeback > dev->data_bytes_per_chunk)
+				BUG();
+
+		} else {
+			n_copy = dev->data_bytes_per_chunk - start;
+			n_writeback = dev->data_bytes_per_chunk;
+		}
+
+		if (n_copy != dev->data_bytes_per_chunk ||
+		    !dev->param.cache_bypass_aligned ||
+		    dev->param.inband_tags) {
+			/* An incomplete start or end chunk (or maybe both
+			 * start and end chunk), or we're using inband tags,
+			 * or we're forcing writes through the cache,
+			 * so we want to use the cache buffers.
+			 */
+			if (dev->param.n_caches > 0) {
+				struct yaffs_cache *cache;
+
+				/* If we can't find the data in the cache, then
+				 * load the cache */
+				cache = yaffs_find_chunk_cache(in, chunk);
+
+				if (!cache &&
+				    yaffs_check_alloc_available(dev, 1)) {
+					cache = yaffs_grab_chunk_cache(dev);
+					cache->object = in;
+					cache->chunk_id = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_rd_data_obj(in, chunk,
+							  cache->data);
+				} else if (cache &&
+					   !cache->dirty &&
+					   !yaffs_check_alloc_available(dev,
+									1)) {
+					/* Drop the cache if it was a read cache
+					 * item and no space check has been made
+					 * for it.
+					 */
+					cache = NULL;
+				}
+
+				if (cache) {
+					yaffs_use_cache(dev, cache, 1);
+					cache->locked = 1;
+
+					memcpy(&cache->data[start], buffer,
+					       n_copy);
+
+					cache->locked = 0;
+					cache->n_bytes = n_writeback;
+
+					if (write_through) {
+						chunk_written =
+						    yaffs_wr_data_obj
+						    (cache->object,
+						     cache->chunk_id,
+						     cache->data,
+						     cache->n_bytes, 1);
+						cache->dirty = 0;
+					}
+				} else {
+					chunk_written = -1;	/* fail write */
+				}
+			} else {
+				/* An incomplete start or end chunk (or maybe
+				 * both start and end chunk). Read into the
+				 * local buffer then copy over and write back.
+				 */
+
+				u8 *local_buffer = yaffs_get_temp_buffer(dev);
+
+				yaffs_rd_data_obj(in, chunk, local_buffer);
+				memcpy(&local_buffer[start], buffer, n_copy);
+
+				chunk_written =
+				    yaffs_wr_data_obj(in, chunk,
+						      local_buffer,
+						      n_writeback, 0);
+
+				yaffs_release_temp_buffer(dev, local_buffer);
+			}
+		} else {
+			/* A full chunk. Write directly from the buffer. */
+
+			chunk_written =
+			    yaffs_wr_data_obj(in, chunk, buffer,
+					      dev->data_bytes_per_chunk, 0);
+
+			/* Since we've overwritten the cached data,
+			 * we better invalidate it. */
+			yaffs_invalidate_chunk_cache(in, chunk);
+		}
+
+		if (chunk_written >= 0) {
+			n -= n_copy;
+			offset += n_copy;
+			buffer += n_copy;
+			n_done += n_copy;
+		}
+	}
+
+	/* Update file object */
+
+	if ((start_write + n_done) > in->variant.file_variant.file_size)
+		in->variant.file_variant.file_size = (start_write + n_done);
+
+	in->dirty = 1;
+	return n_done;
+}
+
+int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, Y_LOFF_T offset,
+		  int n_bytes, int write_through)
+{
+	yaffs2_handle_hole(in, offset);
+	return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
+}
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_prune_chunks(struct yaffs_obj *in, Y_LOFF_T new_size)
+{
+
+	struct yaffs_dev *dev = in->my_dev;
+	Y_LOFF_T old_size = in->variant.file_variant.file_size;
+	int i;
+	int chunk_id;
+	u32 dummy;
+	int last_del;
+	int start_del;
+
+	if (old_size > 0)
+		yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
+	else
+		last_del = 0;
+
+	yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
+				&start_del, &dummy);
+	last_del++;
+	start_del++;
+
+	/* Delete backwards so that we don't end up with holes if
+	 * power is lost part-way through the operation.
+	 */
+	for (i = last_del; i >= start_del; i--) {
+		/* NB this could be optimised somewhat,
+		 * eg. could retrieve the tags and write them without
+		 * using yaffs_chunk_del
+		 */
+
+		chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
+
+		if (chunk_id < 1)
+			continue;
+
+		if (chunk_id <
+		    (dev->internal_start_block * dev->param.chunks_per_block) ||
+		    chunk_id >=
+		    ((dev->internal_end_block + 1) *
+		      dev->param.chunks_per_block)) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Found daft chunk_id %d for %d",
+				chunk_id, i);
+		} else {
+			in->n_data_chunks--;
+			yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
+		}
+	}
+}
+
+void yaffs_resize_file_down(struct yaffs_obj *obj, Y_LOFF_T new_size)
+{
+	int new_full;
+	u32 new_partial;
+	struct yaffs_dev *dev = obj->my_dev;
+
+	yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
+
+	yaffs_prune_chunks(obj, new_size);
+
+	if (new_partial != 0) {
+		int last_chunk = 1 + new_full;
+		u8 *local_buffer = yaffs_get_temp_buffer(dev);
+
+		/* Rewrite the last chunk with its new size and zero pad */
+		yaffs_rd_data_obj(obj, last_chunk, local_buffer);
+		memset(local_buffer + new_partial, 0,
+		       dev->data_bytes_per_chunk - new_partial);
+
+		yaffs_wr_data_obj(obj, last_chunk, local_buffer,
+				  new_partial, 1);
+
+		yaffs_release_temp_buffer(dev, local_buffer);
+	}
+
+	obj->variant.file_variant.file_size = new_size;
+
+	yaffs_prune_tree(dev, &obj->variant.file_variant);
+}
+
+int yaffs_resize_file(struct yaffs_obj *in, Y_LOFF_T new_size)
+{
+	struct yaffs_dev *dev = in->my_dev;
+	Y_LOFF_T old_size = in->variant.file_variant.file_size;
+
+	yaffs_flush_file_cache(in, 1);
+	yaffs_invalidate_whole_cache(in);
+
+	yaffs_check_gc(dev, 0);
+
+	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	if (new_size == old_size)
+		return YAFFS_OK;
+
+	if (new_size > old_size) {
+		yaffs2_handle_hole(in, new_size);
+		in->variant.file_variant.file_size = new_size;
+	} else {
+		/* new_size < old_size */
+		yaffs_resize_file_down(in, new_size);
+	}
+
+	/* Write a new object header to reflect the resize.
+	 * show we've shrunk the file, if need be
+	 * Do this only if the file is not in the deleted directories
+	 * and is not shadowed.
+	 */
+	if (in->parent &&
+	    !in->is_shadowed &&
+	    in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+	    in->parent->obj_id != YAFFS_OBJECTID_DELETED)
+		yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
+
+	return YAFFS_OK;
+}
+
+int yaffs_flush_file(struct yaffs_obj *in,
+		     int update_time,
+		     int data_sync,
+		     int discard_cache)
+{
+	if (!in->dirty)
+		return YAFFS_OK;
+
+	yaffs_flush_file_cache(in, discard_cache);
+
+	if (data_sync)
+		return YAFFS_OK;
+
+	if (update_time)
+		yaffs_load_current_time(in, 0, 0);
+
+	return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
+				YAFFS_OK : YAFFS_FAIL;
+}
+
+
+/* yaffs_del_file deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
+{
+	int ret_val;
+	int del_now = 0;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (!in->my_inode)
+		del_now = 1;
+
+	if (del_now) {
+		ret_val =
+		    yaffs_change_obj_name(in, in->my_dev->del_dir,
+					  _Y("deleted"), 0, 0);
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"yaffs: immediate deletion of file %d",
+			in->obj_id);
+		in->deleted = 1;
+		in->my_dev->n_deleted_files++;
+		if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+			yaffs_resize_file(in, 0);
+		yaffs_soft_del_file(in);
+	} else {
+		ret_val =
+		    yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
+					  _Y("unlinked"), 0, 0);
+	}
+	return ret_val;
+}
+
+static int yaffs_del_file(struct yaffs_obj *in)
+{
+	int ret_val = YAFFS_OK;
+	int deleted;	/* Need to cache value on stack if in is freed */
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+		yaffs_resize_file(in, 0);
+
+	if (in->n_data_chunks > 0) {
+		/* Use soft deletion if there is data in the file.
+		 * That won't be the case if it has been resized to zero.
+		 */
+		if (!in->unlinked)
+			ret_val = yaffs_unlink_file_if_needed(in);
+
+		deleted = in->deleted;
+
+		if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
+			in->deleted = 1;
+			deleted = 1;
+			in->my_dev->n_deleted_files++;
+			yaffs_soft_del_file(in);
+		}
+		return deleted ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		/* The file has no data chunks so we toss it immediately */
+		yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
+		in->variant.file_variant.top = NULL;
+		yaffs_generic_obj_del(in);
+
+		return YAFFS_OK;
+	}
+}
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
+{
+	return (obj &&
+		obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+		!(list_empty(&obj->variant.dir_variant.children));
+}
+
+static int yaffs_del_dir(struct yaffs_obj *obj)
+{
+	/* First check that the directory is empty. */
+	if (yaffs_is_non_empty_dir(obj))
+		return YAFFS_FAIL;
+
+	return yaffs_generic_obj_del(obj);
+}
+
+static int yaffs_del_symlink(struct yaffs_obj *in)
+{
+	kfree(in->variant.symlink_variant.alias);
+	in->variant.symlink_variant.alias = NULL;
+
+	return yaffs_generic_obj_del(in);
+}
+
+static int yaffs_del_link(struct yaffs_obj *in)
+{
+	/* remove this hardlink from the list associated with the equivalent
+	 * object
+	 */
+	list_del_init(&in->hard_links);
+	return yaffs_generic_obj_del(in);
+}
+
+int yaffs_del_obj(struct yaffs_obj *obj)
+{
+	int ret_val = -1;
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		ret_val = yaffs_del_file(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		if (!list_empty(&obj->variant.dir_variant.dirty)) {
+			yaffs_trace(YAFFS_TRACE_BACKGROUND,
+				"Remove object %d from dirty directories",
+				obj->obj_id);
+			list_del_init(&obj->variant.dir_variant.dirty);
+		}
+		return yaffs_del_dir(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		ret_val = yaffs_del_symlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		ret_val = yaffs_del_link(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		ret_val = yaffs_generic_obj_del(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		ret_val = 0;
+		break;		/* should not happen. */
+	}
+	return ret_val;
+}
+
+
+static void yaffs_empty_dir_to_dir(struct yaffs_obj *from_dir,
+				   struct yaffs_obj *to_dir)
+{
+	struct yaffs_obj *obj;
+	struct list_head *lh;
+	struct list_head *n;
+
+	list_for_each_safe(lh, n, &from_dir->variant.dir_variant.children) {
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		yaffs_add_obj_to_dir(to_dir, obj);
+	}
+}
+
+struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
+				   enum yaffs_obj_type type)
+{
+	/* Tear down the old variant */
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		/* Nuke file data */
+		yaffs_resize_file(obj, 0);
+		yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
+		obj->variant.file_variant.top = NULL;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		/* Put the children in lost and found. */
+		yaffs_empty_dir_to_dir(obj, obj->my_dev->lost_n_found);
+		if (!list_empty(&obj->variant.dir_variant.dirty))
+			list_del_init(&obj->variant.dir_variant.dirty);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		/* Nuke symplink data */
+		kfree(obj->variant.symlink_variant.alias);
+		obj->variant.symlink_variant.alias = NULL;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		list_del_init(&obj->hard_links);
+		break;
+	default:
+		break;
+	}
+
+	memset(&obj->variant, 0, sizeof(obj->variant));
+
+	/*Set up new variant if the memset is not enough. */
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		INIT_LIST_HEAD(&obj->variant.dir_variant.children);
+		INIT_LIST_HEAD(&obj->variant.dir_variant.dirty);
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+	default:
+		break;
+	}
+
+	obj->variant_type = type;
+
+	return obj;
+
+}
+
+static int yaffs_unlink_worker(struct yaffs_obj *obj)
+{
+	int del_now = 0;
+
+	if (!obj)
+		return YAFFS_FAIL;
+
+	if (!obj->my_inode)
+		del_now = 1;
+
+	yaffs_update_parent(obj->parent);
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+		return yaffs_del_link(obj);
+	} else if (!list_empty(&obj->hard_links)) {
+		/* Curve ball: We're unlinking an object that has a hardlink.
+		 *
+		 * This problem arises because we are not strictly following
+		 * The Linux link/inode model.
+		 *
+		 * We can't really delete the object.
+		 * Instead, we do the following:
+		 * - Select a hardlink.
+		 * - Unhook it from the hard links
+		 * - Move it from its parent directory so that the rename works.
+		 * - Rename the object to the hardlink's name.
+		 * - Delete the hardlink
+		 */
+
+		struct yaffs_obj *hl;
+		struct yaffs_obj *parent;
+		int ret_val;
+		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+		hl = list_entry(obj->hard_links.next, struct yaffs_obj,
+				hard_links);
+
+		yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+		parent = hl->parent;
+
+		list_del_init(&hl->hard_links);
+
+		yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
+
+		ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
+
+		if (ret_val == YAFFS_OK)
+			ret_val = yaffs_generic_obj_del(hl);
+
+		return ret_val;
+
+	} else if (del_now) {
+		switch (obj->variant_type) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			return yaffs_del_file(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			list_del_init(&obj->variant.dir_variant.dirty);
+			return yaffs_del_dir(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			return yaffs_del_symlink(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			return yaffs_generic_obj_del(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		default:
+			return YAFFS_FAIL;
+		}
+	} else if (yaffs_is_non_empty_dir(obj)) {
+		return YAFFS_FAIL;
+	} else {
+		return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
+						_Y("unlinked"), 0, 0);
+	}
+}
+
+static int yaffs_unlink_obj(struct yaffs_obj *obj)
+{
+	if (obj && obj->unlink_allowed)
+		return yaffs_unlink_worker(obj);
+
+	return YAFFS_FAIL;
+}
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
+{
+	struct yaffs_obj *obj;
+
+	obj = yaffs_find_by_name(dir, name);
+	return yaffs_unlink_obj(obj);
+}
+
+/* Note:
+ * If old_name is NULL then we take old_dir as the object to be renamed.
+ */
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
+		     struct yaffs_obj *new_dir, const YCHAR *new_name)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *existing_target = NULL;
+	int force = 0;
+	int result;
+	struct yaffs_dev *dev;
+
+	if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+	if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	dev = old_dir->my_dev;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+	/* Special case for case insemsitive systems.
+	 * While look-up is case insensitive, the name isn't.
+	 * Therefore we might want to change x.txt to X.txt
+	 */
+	if (old_dir == new_dir &&
+		old_name && new_name &&
+		yaffs_strcmp(old_name, new_name) == 0)
+		force = 1;
+#endif
+
+	if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
+	    YAFFS_MAX_NAME_LENGTH)
+		/* ENAMETOOLONG */
+		return YAFFS_FAIL;
+
+	if (old_name)
+		obj = yaffs_find_by_name(old_dir, old_name);
+	else{
+		obj = old_dir;
+		old_dir = obj->parent;
+	}
+
+	if (obj && obj->rename_allowed) {
+		/* Now handle an existing target, if there is one */
+		existing_target = yaffs_find_by_name(new_dir, new_name);
+		if (yaffs_is_non_empty_dir(existing_target)) {
+			return YAFFS_FAIL;	/* ENOTEMPTY */
+		} else if (existing_target && existing_target != obj) {
+			/* Nuke the target first, using shadowing,
+			 * but only if it isn't the same object.
+			 *
+			 * Note we must disable gc here otherwise it can mess
+			 * up the shadowing.
+			 *
+			 */
+			dev->gc_disable = 1;
+			yaffs_change_obj_name(obj, new_dir, new_name, force,
+					      existing_target->obj_id);
+			existing_target->is_shadowed = 1;
+			yaffs_unlink_obj(existing_target);
+			dev->gc_disable = 0;
+		}
+
+		result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
+
+		yaffs_update_parent(old_dir);
+		if (new_dir != old_dir)
+			yaffs_update_parent(new_dir);
+
+		return result;
+	}
+	return YAFFS_FAIL;
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+			       int backward_scanning)
+{
+	struct yaffs_obj *obj;
+
+	if (backward_scanning) {
+		/* Handle YAFFS2 case (backward scanning)
+		 * If the shadowed object exists then ignore.
+		 */
+		obj = yaffs_find_by_number(dev, obj_id);
+		if (obj)
+			return;
+	}
+
+	/* Let's create it (if it does not exist) assuming it is a file so that
+	 * it can do shrinking etc.
+	 * We put it in unlinked dir to be cleaned up after the scanning
+	 */
+	obj =
+	    yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
+	if (!obj)
+		return;
+	obj->is_shadowed = 1;
+	yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
+	obj->variant.file_variant.shrink_size = 0;
+	obj->valid = 1;		/* So that we don't read any other info. */
+}
+
+void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
+{
+	struct list_head *lh;
+	struct list_head *save;
+	struct yaffs_obj *hl;
+	struct yaffs_obj *in;
+
+	list_for_each_safe(lh, save, hard_list) {
+		hl = list_entry(lh, struct yaffs_obj, hard_links);
+		in = yaffs_find_by_number(dev,
+					hl->variant.hardlink_variant.equiv_id);
+
+		if (in) {
+			/* Add the hardlink pointers */
+			hl->variant.hardlink_variant.equiv_obj = in;
+			list_add(&hl->hard_links, &in->hard_links);
+		} else {
+			/* Todo Need to report/handle this better.
+			 * Got a problem... hardlink to a non-existant object
+			 */
+			hl->variant.hardlink_variant.equiv_obj = NULL;
+			INIT_LIST_HEAD(&hl->hard_links);
+		}
+	}
+}
+
+static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
+{
+	/*
+	 *  Sort out state of unlinked and deleted objects after scanning.
+	 */
+	struct list_head *i;
+	struct list_head *n;
+	struct yaffs_obj *l;
+
+	if (dev->read_only)
+		return;
+
+	/* Soft delete all the unlinked files */
+	list_for_each_safe(i, n,
+			   &dev->unlinked_dir->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+		yaffs_del_obj(l);
+	}
+
+	list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+		yaffs_del_obj(l);
+	}
+}
+
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ *  This code assumes that we don't ever change the current relationships
+ *  between directories:
+ *   root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
+ *   lost-n-found->parent == root_dir
+ *
+ * This fixes the problem where directories might have inadvertently been
+ * deleted leaving the object "hanging" without being rooted in the
+ * directory tree.
+ */
+
+static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+	return (obj == dev->del_dir ||
+		obj == dev->unlinked_dir || obj == dev->root_dir);
+}
+
+static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_obj *parent;
+	int i;
+	struct list_head *lh;
+	struct list_head *n;
+	int depth_limit;
+	int hanging;
+
+	if (dev->read_only)
+		return;
+
+	/* Iterate through the objects in each hash entry,
+	 * looking at each object.
+	 * Make sure it is rooted.
+	 */
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			parent = obj->parent;
+
+			if (yaffs_has_null_parent(dev, obj)) {
+				/* These directories are not hanging */
+				hanging = 0;
+			} else if (!parent ||
+				   parent->variant_type !=
+				   YAFFS_OBJECT_TYPE_DIRECTORY) {
+				hanging = 1;
+			} else if (yaffs_has_null_parent(dev, parent)) {
+				hanging = 0;
+			} else {
+				/*
+				 * Need to follow the parent chain to
+				 * see if it is hanging.
+				 */
+				hanging = 0;
+				depth_limit = 100;
+
+				while (parent != dev->root_dir &&
+				       parent->parent &&
+				       parent->parent->variant_type ==
+				       YAFFS_OBJECT_TYPE_DIRECTORY &&
+				       depth_limit > 0) {
+					parent = parent->parent;
+					depth_limit--;
+				}
+				if (parent != dev->root_dir)
+					hanging = 1;
+			}
+			if (hanging) {
+				yaffs_trace(YAFFS_TRACE_SCAN,
+					"Hanging object %d moved to lost and found",
+					obj->obj_id);
+				yaffs_add_obj_to_dir(dev->lost_n_found, obj);
+			}
+		}
+	}
+}
+
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_del_dir_contents(struct yaffs_obj *dir)
+{
+	struct yaffs_obj *obj;
+	struct list_head *lh;
+	struct list_head *n;
+
+	if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		BUG();
+
+	list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+			yaffs_del_dir_contents(obj);
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"Deleting lost_found object %d",
+			obj->obj_id);
+		yaffs_unlink_obj(obj);
+	}
+}
+
+static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
+{
+	yaffs_del_dir_contents(dev->lost_n_found);
+}
+
+
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
+				     const YCHAR *name)
+{
+	int sum;
+	struct list_head *i;
+	YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+	struct yaffs_obj *l;
+
+	if (!name)
+		return NULL;
+
+	if (!directory) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_find_by_name: null pointer directory"
+			);
+		BUG();
+		return NULL;
+	}
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_find_by_name: non-directory"
+			);
+		BUG();
+	}
+
+	sum = yaffs_calc_name_sum(name);
+
+	list_for_each(i, &directory->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+
+		if (l->parent != directory)
+			BUG();
+
+		yaffs_check_obj_details_loaded(l);
+
+		/* Special case for lost-n-found */
+		if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+			if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
+				return l;
+		} else if (l->sum == sum || l->hdr_chunk <= 0) {
+			/* LostnFound chunk called Objxxx
+			 * Do a real check
+			 */
+			yaffs_get_obj_name(l, buffer,
+				YAFFS_MAX_NAME_LENGTH + 1);
+			if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
+				return l;
+		}
+	}
+	return NULL;
+}
+
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
+{
+	if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+		obj = obj->variant.hardlink_variant.equiv_obj;
+		yaffs_check_obj_details_loaded(obj);
+	}
+	return obj;
+}
+
+/*
+ *  A note or two on object names.
+ *  * If the object name is missing, we then make one up in the form objnnn
+ *
+ *  * ASCII names are stored in the object header's name field from byte zero
+ *  * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ *  - If the name can fit in the ASCII character space then they are saved as
+ *    ascii names as per above.
+ *  - If the name needs Unicode then the name is saved in Unicode
+ *    starting at oh->name[1].
+
+ */
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
+				int buffer_size)
+{
+	/* Create an object name if we could not find one. */
+	if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
+		YCHAR local_name[20];
+		YCHAR num_string[20];
+		YCHAR *x = &num_string[19];
+		unsigned v = obj->obj_id;
+		num_string[19] = 0;
+		while (v > 0) {
+			x--;
+			*x = '0' + (v % 10);
+			v /= 10;
+		}
+		/* make up a name */
+		yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
+		yaffs_strcat(local_name, x);
+		yaffs_strncpy(name, local_name, buffer_size - 1);
+	}
+}
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
+{
+	memset(name, 0, buffer_size * sizeof(YCHAR));
+	yaffs_check_obj_details_loaded(obj);
+	if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
+	} else if (obj->short_name[0]) {
+		yaffs_strcpy(name, obj->short_name);
+	} else if (obj->hdr_chunk > 0) {
+		//int result;
+		u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
+
+		struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
+
+		memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
+
+		if (obj->hdr_chunk > 0) {
+			if (!yaffs_rd_chunk_tags_nand(obj->my_dev,
+							  obj->hdr_chunk,
+							  buffer, NULL))
+			{
+		    	    yaffs_trace(YAFFS_TRACE_ERROR, 
+					"yaffs_get_obj_name: unhandled error from rd_chunk_tags_nand");
+			}
+		}
+		yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
+					buffer_size);
+
+		yaffs_release_temp_buffer(obj->my_dev, buffer);
+	}
+
+	yaffs_fix_null_name(obj, name, buffer_size);
+
+	return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
+}
+
+Y_LOFF_T yaffs_get_obj_length(struct yaffs_obj *obj)
+{
+	/* Dereference any hard linking */
+	obj = yaffs_get_equivalent_obj(obj);
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		return obj->variant.file_variant.file_size;
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		if (!obj->variant.symlink_variant.alias)
+			return 0;
+		return yaffs_strnlen(obj->variant.symlink_variant.alias,
+				     YAFFS_MAX_ALIAS_LENGTH);
+	} else {
+		/* Only a directory should drop through to here */
+		return obj->my_dev->data_bytes_per_chunk;
+	}
+}
+
+int yaffs_get_obj_link_count(struct yaffs_obj *obj)
+{
+	int count = 0;
+	struct list_head *i;
+
+	if (!obj->unlinked)
+		count++;	/* the object itself */
+
+	list_for_each(i, &obj->hard_links)
+	    count++;		/* add the hard links; */
+
+	return count;
+}
+
+int yaffs_get_obj_inode(struct yaffs_obj *obj)
+{
+	obj = yaffs_get_equivalent_obj(obj);
+
+	return obj->obj_id;
+}
+
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
+{
+	obj = yaffs_get_equivalent_obj(obj);
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		return DT_DIR;
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		return DT_LNK;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		if (S_ISFIFO(obj->yst_mode))
+			return DT_FIFO;
+		if (S_ISCHR(obj->yst_mode))
+			return DT_CHR;
+		if (S_ISBLK(obj->yst_mode))
+			return DT_BLK;
+		if (S_ISSOCK(obj->yst_mode))
+			return DT_SOCK;
+		return DT_REG;
+		break;
+	default:
+		return DT_REG;
+		break;
+	}
+}
+
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
+{
+	obj = yaffs_get_equivalent_obj(obj);
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+		return yaffs_clone_str(obj->variant.symlink_variant.alias);
+	else
+		return yaffs_clone_str(_Y(""));
+}
+
+/*--------------------------- Initialisation code -------------------------- */
+
+static int yaffs_check_dev_fns(struct yaffs_dev *dev)
+{
+	struct yaffs_driver *drv = &dev->drv;
+	struct yaffs_tags_handler *tagger = &dev->tagger;
+
+	/* Common functions, gotta have */
+	if (!drv->drv_read_chunk_fn ||
+	    !drv->drv_write_chunk_fn ||
+	    !drv->drv_erase_fn)
+		return 0;
+
+	if (dev->param.is_yaffs2 &&
+	     (!drv->drv_mark_bad_fn  || !drv->drv_check_bad_fn))
+		return 0;
+
+	/* Install the default tags marshalling functions if needed. */
+	yaffs_tags_compat_install(dev);
+	yaffs_tags_marshall_install(dev);
+
+	/* Check we now have the marshalling functions required. */
+	if (!tagger->write_chunk_tags_fn ||
+	    !tagger->read_chunk_tags_fn ||
+	    !tagger->query_block_fn ||
+	    !tagger->mark_bad_fn)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs_create_initial_dir(struct yaffs_dev *dev)
+{
+	/* Initialise the unlinked, deleted, root and lost+found directories */
+	dev->lost_n_found = dev->root_dir = NULL;
+	dev->unlinked_dir = dev->del_dir = NULL;
+	dev->unlinked_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+	dev->del_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+	dev->root_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
+				  YAFFS_ROOT_MODE | S_IFDIR);
+	dev->lost_n_found =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
+				  YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+
+	if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
+	    && dev->del_dir) {
+		yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
+		return YAFFS_OK;
+	}
+	return YAFFS_FAIL;
+}
+
+/* Low level init.
+ * Typically only used by yaffs_guts_initialise, but also used by the
+ * Low level yaffs driver tests.
+ */
+
+int yaffs_guts_ll_init(struct yaffs_dev *dev)
+{
+
+
+	yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_ll_init()");
+
+	if (!dev) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs: Need a device"
+			);
+		return YAFFS_FAIL;
+	}
+
+	if (dev->ll_init)
+		return YAFFS_OK;
+
+	dev->internal_start_block = dev->param.start_block;
+	dev->internal_end_block = dev->param.end_block;
+	dev->block_offset = 0;
+	dev->chunk_offset = 0;
+	dev->n_free_chunks = 0;
+
+	dev->gc_block = 0;
+
+	if (dev->param.start_block == 0) {
+		dev->internal_start_block = dev->param.start_block + 1;
+		dev->internal_end_block = dev->param.end_block + 1;
+		dev->block_offset = 1;
+		dev->chunk_offset = dev->param.chunks_per_block;
+	}
+
+	/* Check geometry parameters. */
+
+	if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
+		dev->param.total_bytes_per_chunk < 1024) ||
+		(!dev->param.is_yaffs2 &&
+			dev->param.total_bytes_per_chunk < 512) ||
+		(dev->param.inband_tags && !dev->param.is_yaffs2) ||
+		 dev->param.chunks_per_block < 2 ||
+		 dev->param.n_reserved_blocks < 2 ||
+		dev->internal_start_block <= 0 ||
+		dev->internal_end_block <= 0 ||
+		dev->internal_end_block <=
+		(dev->internal_start_block + dev->param.n_reserved_blocks + 2)
+		) {
+		/* otherwise it is too small */
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
+			dev->param.total_bytes_per_chunk,
+			dev->param.is_yaffs2 ? "2" : "",
+			dev->param.inband_tags);
+		return YAFFS_FAIL;
+	}
+
+	/* Sort out space for inband tags, if required */
+	if (dev->param.inband_tags)
+		dev->data_bytes_per_chunk =
+		    dev->param.total_bytes_per_chunk -
+		    sizeof(struct yaffs_packed_tags2_tags_only);
+	else
+		dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
+
+	/* Got the right mix of functions? */
+	if (!yaffs_check_dev_fns(dev)) {
+		/* Function missing */
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"device function(s) missing or wrong");
+
+		return YAFFS_FAIL;
+	}
+
+	if (yaffs_init_nand(dev) != YAFFS_OK) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
+		return YAFFS_FAIL;
+	}
+
+	return YAFFS_OK;
+}
+
+
+int yaffs_guts_format_dev(struct yaffs_dev *dev)
+{
+	int i;
+	enum yaffs_block_state state;
+	u32 dummy;
+
+	if(yaffs_guts_ll_init(dev) != YAFFS_OK)
+		return YAFFS_FAIL;
+
+	if(dev->is_mounted)
+		return YAFFS_FAIL;
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		yaffs_query_init_block_state(dev, i, &state, &dummy);
+		if (state != YAFFS_BLOCK_STATE_DEAD)
+			yaffs_erase_block(dev, i);
+	}
+
+	return YAFFS_OK;
+}
+
+
+int yaffs_guts_initialise(struct yaffs_dev *dev)
+{
+	int init_failed = 0;
+	unsigned x;
+	int bits;
+
+	if(yaffs_guts_ll_init(dev) != YAFFS_OK)
+		return YAFFS_FAIL;
+
+	if (dev->is_mounted) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
+		return YAFFS_FAIL;
+	}
+
+	dev->is_mounted = 1;
+
+	/* OK now calculate a few things for the device */
+
+	/*
+	 *  Calculate all the chunk size manipulation numbers:
+	 */
+	x = dev->data_bytes_per_chunk;
+	/* We always use dev->chunk_shift and dev->chunk_div */
+	dev->chunk_shift = calc_shifts(x);
+	x >>= dev->chunk_shift;
+	dev->chunk_div = x;
+	/* We only use chunk mask if chunk_div is 1 */
+	dev->chunk_mask = (1 << dev->chunk_shift) - 1;
+
+	/*
+	 * Calculate chunk_grp_bits.
+	 * We need to find the next power of 2 > than internal_end_block
+	 */
+
+	x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
+
+	bits = calc_shifts_ceiling(x);
+
+	/* Set up tnode width if wide tnodes are enabled. */
+	if (!dev->param.wide_tnodes_disabled) {
+		/* bits must be even so that we end up with 32-bit words */
+		if (bits & 1)
+			bits++;
+		if (bits < 16)
+			dev->tnode_width = 16;
+		else
+			dev->tnode_width = bits;
+	} else {
+		dev->tnode_width = 16;
+	}
+
+	dev->tnode_mask = (1 << dev->tnode_width) - 1;
+
+	/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+	 * so if the bitwidth of the
+	 * chunk range we're using is greater than 16 we need
+	 * to figure out chunk shift and chunk_grp_size
+	 */
+
+	if (bits <= (int)dev->tnode_width)
+		dev->chunk_grp_bits = 0;
+	else
+		dev->chunk_grp_bits = bits - dev->tnode_width;
+
+	dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
+	if (dev->tnode_size < sizeof(struct yaffs_tnode))
+		dev->tnode_size = sizeof(struct yaffs_tnode);
+
+	dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
+
+	if (dev->param.chunks_per_block < dev->chunk_grp_size) {
+		/* We have a problem because the soft delete won't work if
+		 * the chunk group size > chunks per block.
+		 * This can be remedied by using larger "virtual blocks".
+		 */
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
+
+		return YAFFS_FAIL;
+	}
+
+	/* Finished verifying the device, continue with initialisation */
+
+	/* More device initialisation */
+	dev->all_gcs = 0;
+	dev->passive_gc_count = 0;
+	dev->oldest_dirty_gc_count = 0;
+	dev->bg_gcs = 0;
+	dev->gc_block_finder = 0;
+	dev->buffered_block = -1;
+	dev->doing_buffered_block_rewrite = 0;
+	dev->n_deleted_files = 0;
+	dev->n_bg_deletions = 0;
+	dev->n_unlinked_files = 0;
+	dev->n_ecc_fixed = 0;
+	dev->n_ecc_unfixed = 0;
+	dev->n_tags_ecc_fixed = 0;
+	dev->n_tags_ecc_unfixed = 0;
+	dev->n_erase_failures = 0;
+	dev->n_erased_blocks = 0;
+	dev->gc_disable = 0;
+	dev->has_pending_prioritised_gc = 1;
+		/* Assume the worst for now, will get fixed on first GC */
+	INIT_LIST_HEAD(&dev->dirty_dirs);
+	dev->oldest_dirty_seq = 0;
+	dev->oldest_dirty_block = 0;
+
+	/* Initialise temporary buffers and caches. */
+	if (!yaffs_init_tmp_buffers(dev))
+		init_failed = 1;
+
+	dev->cache = NULL;
+	dev->gc_cleanup_list = NULL;
+
+	if (!init_failed && dev->param.n_caches > 0) {
+		int i;
+		void *buf;
+		int cache_bytes =
+		    dev->param.n_caches * sizeof(struct yaffs_cache);
+
+		if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
+			dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
+
+		dev->cache = kmalloc(cache_bytes, GFP_NOFS);
+
+		buf = (u8 *) dev->cache;
+
+		if (dev->cache)
+			memset(dev->cache, 0, cache_bytes);
+
+		for (i = 0; i < dev->param.n_caches && buf; i++) {
+			dev->cache[i].object = NULL;
+			dev->cache[i].last_use = 0;
+			dev->cache[i].dirty = 0;
+			dev->cache[i].data = buf =
+			    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+		}
+		if (!buf)
+			init_failed = 1;
+
+		dev->cache_last_use = 0;
+	}
+
+	dev->cache_hits = 0;
+
+	if (!init_failed) {
+		dev->gc_cleanup_list =
+		    kmalloc(dev->param.chunks_per_block * sizeof(u32),
+					GFP_NOFS);
+		if (!dev->gc_cleanup_list)
+			init_failed = 1;
+	}
+
+	if (dev->param.is_yaffs2)
+		dev->param.use_header_file_size = 1;
+
+	if (!init_failed && !yaffs_init_blocks(dev))
+		init_failed = 1;
+
+	yaffs_init_tnodes_and_objs(dev);
+
+	if (!init_failed && !yaffs_create_initial_dir(dev))
+		init_failed = 1;
+
+	if (!init_failed && dev->param.is_yaffs2 &&
+		!dev->param.disable_summary &&
+		!yaffs_summary_init(dev))
+		init_failed = 1;
+
+	if (!init_failed) {
+		/* Now scan the flash. */
+		if (dev->param.is_yaffs2) {
+			if (yaffs2_checkpt_restore(dev)) {
+				yaffs_check_obj_details_loaded(dev->root_dir);
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT |
+					YAFFS_TRACE_MOUNT,
+					"yaffs: restored from checkpoint"
+					);
+			} else {
+
+				/* Clean up the mess caused by an aborted
+				 * checkpoint load then scan backwards.
+				 */
+				yaffs_deinit_blocks(dev);
+
+				yaffs_deinit_tnodes_and_objs(dev);
+
+				dev->n_erased_blocks = 0;
+				dev->n_free_chunks = 0;
+				dev->alloc_block = -1;
+				dev->alloc_page = -1;
+				dev->n_deleted_files = 0;
+				dev->n_unlinked_files = 0;
+				dev->n_bg_deletions = 0;
+
+				if (!init_failed && !yaffs_init_blocks(dev))
+					init_failed = 1;
+
+				yaffs_init_tnodes_and_objs(dev);
+
+				if (!init_failed
+				    && !yaffs_create_initial_dir(dev))
+					init_failed = 1;
+
+				if (!init_failed && !yaffs2_scan_backwards(dev))
+					init_failed = 1;
+			}
+		} else if (!yaffs1_scan(dev)) {
+			init_failed = 1;
+		}
+
+		yaffs_strip_deleted_objs(dev);
+		yaffs_fix_hanging_objs(dev);
+		if (dev->param.empty_lost_n_found)
+			yaffs_empty_l_n_f(dev);
+	}
+
+	if (init_failed) {
+		/* Clean up the mess */
+		yaffs_trace(YAFFS_TRACE_TRACING,
+		  "yaffs: yaffs_guts_initialise() aborted.");
+
+		yaffs_deinitialise(dev);
+		return YAFFS_FAIL;
+	}
+
+	/* Zero out stats */
+	dev->n_page_reads = 0;
+	dev->n_page_writes = 0;
+	dev->n_erasures = 0;
+	dev->n_gc_copies = 0;
+	dev->n_retried_writes = 0;
+
+	dev->n_retired_blocks = 0;
+
+	yaffs_verify_free_chunks(dev);
+	yaffs_verify_blocks(dev);
+
+	/* Clean up any aborted checkpoint data */
+	if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
+		yaffs2_checkpt_invalidate(dev);
+
+	yaffs_trace(YAFFS_TRACE_TRACING,
+	  "yaffs: yaffs_guts_initialise() done.");
+	return YAFFS_OK;
+}
+
+void yaffs_deinitialise(struct yaffs_dev *dev)
+{
+	if (dev->is_mounted) {
+		int i;
+
+		yaffs_deinit_blocks(dev);
+		yaffs_deinit_tnodes_and_objs(dev);
+		yaffs_summary_deinit(dev);
+
+		if (dev->param.n_caches > 0 && dev->cache) {
+
+			for (i = 0; i < dev->param.n_caches; i++) {
+				kfree(dev->cache[i].data);
+				dev->cache[i].data = NULL;
+			}
+
+			kfree(dev->cache);
+			dev->cache = NULL;
+		}
+
+		kfree(dev->gc_cleanup_list);
+
+		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+			kfree(dev->temp_buffer[i].buffer);
+
+		dev->is_mounted = 0;
+
+		yaffs_deinit_nand(dev);
+	}
+}
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev)
+{
+	int n_free = 0;
+	int b;
+	struct yaffs_block_info *blk;
+
+	blk = dev->block_info;
+	for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+		switch (blk->block_state) {
+		case YAFFS_BLOCK_STATE_EMPTY:
+		case YAFFS_BLOCK_STATE_ALLOCATING:
+		case YAFFS_BLOCK_STATE_COLLECTING:
+		case YAFFS_BLOCK_STATE_FULL:
+			n_free +=
+			    (dev->param.chunks_per_block - blk->pages_in_use +
+			     blk->soft_del_pages);
+			break;
+		default:
+			break;
+		}
+		blk++;
+	}
+	return n_free;
+}
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
+{
+	/* This is what we report to the outside world */
+	int n_free;
+	int n_dirty_caches;
+	int blocks_for_checkpt;
+	int i;
+
+	n_free = dev->n_free_chunks;
+	n_free += dev->n_deleted_files;
+
+	/* Now count and subtract the number of dirty chunks in the cache. */
+
+	for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].dirty)
+			n_dirty_caches++;
+	}
+
+	n_free -= n_dirty_caches;
+
+	n_free -=
+	    ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
+
+	/* Now figure checkpoint space and report that... */
+	blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
+
+	n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
+
+	if (n_free < 0)
+		n_free = 0;
+
+	return n_free;
+}
+
+
+
+/*
+ * Marshalling functions to get Y_LOFF_T file sizes into and out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, Y_LOFF_T fsize)
+{
+#ifdef CONFIG_YAFFS_OP
+	oh->file_size_low = (fsize & 0xFFFFFFFF);
+	oh->file_size_high = 0; //((fsize >> 32) & 0xFFFFFFFF);
+#else
+	oh->file_size_low = (fsize & 0xFFFFFFFF);
+	oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
+#endif
+}
+
+Y_LOFF_T yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
+{
+	Y_LOFF_T retval;
+
+	if (sizeof(Y_LOFF_T) >= 8 && ~(oh->file_size_high))
+#ifdef CONFIG_YAFFS_OP
+		retval = (((Y_LOFF_T) oh->file_size_low) & 0xFFFFFFFF);
+#else
+		retval = (((Y_LOFF_T) oh->file_size_high) << 32) |
+			(((Y_LOFF_T) oh->file_size_low) & 0xFFFFFFFF);
+#endif
+	else
+		retval = (Y_LOFF_T) oh->file_size_low;
+
+	return retval;
+}
+
+
+void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10])
+{
+	int i;
+	struct yaffs_block_info *bi;
+	int s;
+
+	for(i = 0; i < 10; i++)
+		bs[i] = 0;
+
+	for(i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		bi = yaffs_get_block_info(dev, i);
+		s = bi->block_state;
+		if(s > YAFFS_BLOCK_STATE_DEAD || s < YAFFS_BLOCK_STATE_UNKNOWN)
+			bs[0]++;
+		else
+			bs[s]++;
+	}
+}

flight/pios/common/libraries/yaffs2/yaffs_hweight.c

@@ -0,0 +1,53 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* These functions have been renamed to hweightxx to match the
+ * equivaqlent functions in the Linux kernel.
+ */
+
+#include "yaffs_hweight.h"
+
+static const char yaffs_count_bits_table[256] = {
+	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
+};
+
+int yaffs_hweight8(u8 x)
+{
+	int ret_val;
+	ret_val = yaffs_count_bits_table[x];
+	return ret_val;
+}
+
+int yaffs_hweight32(u32 x)
+{
+	return yaffs_hweight8(x & 0xff) +
+		yaffs_hweight8((x >> 8) & 0xff) +
+		yaffs_hweight8((x >> 16) & 0xff) +
+		yaffs_hweight8((x >> 24) & 0xff);
+}
+

flight/pios/common/libraries/yaffs2/yaffs_nameval.c

@@ -0,0 +1,208 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of
+* values and fits into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ *  sizeof(int) bytes   record size.
+ *  yaffs_strnlen+1 bytes name null terminated.
+ *  nbytes    value.
+ *  ----------
+ *  total size  stored in record size
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+#include "yaffs_nameval.h"
+
+#include "yportenv.h"
+
+static int nval_find(const char *xb, int xb_size, const YCHAR *name,
+		     int *exist_size)
+{
+	int pos = 0;
+	int size;
+
+	memcpy(&size, xb, sizeof(int));
+	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+		if (!yaffs_strncmp((YCHAR *) (xb + pos + sizeof(int)),
+				name, size)) {
+			if (exist_size)
+				*exist_size = size;
+			return pos;
+		}
+		pos += size;
+		if (pos < xb_size - (int)sizeof(int))
+			memcpy(&size, xb + pos, sizeof(int));
+		else
+			size = 0;
+	}
+	if (exist_size)
+		*exist_size = 0;
+	return -ENODATA;
+}
+
+static int nval_used(const char *xb, int xb_size)
+{
+	int pos = 0;
+	int size;
+
+	memcpy(&size, xb + pos, sizeof(int));
+	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+		pos += size;
+		if (pos < xb_size - (int)sizeof(int))
+			memcpy(&size, xb + pos, sizeof(int));
+		else
+			size = 0;
+	}
+	return pos;
+}
+
+int nval_del(char *xb, int xb_size, const YCHAR *name)
+{
+	int pos = nval_find(xb, xb_size, name, NULL);
+	int size;
+
+	if (pos < 0 || pos >= xb_size)
+		return -ENODATA;
+
+	/* Find size, shift rest over this record,
+	 * then zero out the rest of buffer */
+	memcpy(&size, xb + pos, sizeof(int));
+	memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+	memset(xb + (xb_size - size), 0, size);
+	return 0;
+}
+
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf,
+		int bsize, int flags)
+{
+	int pos;
+	int namelen = yaffs_strnlen(name, xb_size);
+	int reclen;
+	int size_exist = 0;
+	int space;
+	int start;
+
+	pos = nval_find(xb, xb_size, name, &size_exist);
+
+	if (flags & XATTR_CREATE && pos >= 0)
+		return -EEXIST;
+	if (flags & XATTR_REPLACE && pos < 0)
+		return -ENODATA;
+
+	start = nval_used(xb, xb_size);
+	space = xb_size - start + size_exist;
+
+	reclen = (sizeof(int) + namelen + 1 + bsize);
+
+	if (reclen > space)
+		return -ENOSPC;
+
+	if (pos >= 0) {
+		nval_del(xb, xb_size, name);
+		start = nval_used(xb, xb_size);
+	}
+
+	pos = start;
+
+	memcpy(xb + pos, &reclen, sizeof(int));
+	pos += sizeof(int);
+	yaffs_strncpy((YCHAR *) (xb + pos), name, reclen);
+	pos += (namelen + 1);
+	memcpy(xb + pos, buf, bsize);
+	return 0;
+}
+
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+	     int bsize)
+{
+	int pos = nval_find(xb, xb_size, name, NULL);
+	int size;
+
+	if (pos >= 0 && pos < xb_size) {
+
+		memcpy(&size, xb + pos, sizeof(int));
+		pos += sizeof(int);	/* advance past record length */
+		size -= sizeof(int);
+
+		/* Advance over name string */
+		while (xb[pos] && size > 0 && pos < xb_size) {
+			pos++;
+			size--;
+		}
+		/*Advance over NUL */
+		pos++;
+		size--;
+
+		/* If bsize is zero then this is a size query.
+		 * Return the size, but don't copy.
+		 */
+		if (!bsize)
+			return size;
+
+		if (size <= bsize) {
+			memcpy(buf, xb + pos, size);
+			return size;
+		}
+	}
+	if (pos >= 0)
+		return -ERANGE;
+
+	return -ENODATA;
+}
+
+int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+{
+	int pos = 0;
+	int size;
+	int name_len;
+	int ncopied = 0;
+	int filled = 0;
+
+	memcpy(&size, xb + pos, sizeof(int));
+	while (size > (int)sizeof(int) &&
+		size <= xb_size &&
+		(pos + size) < xb_size &&
+		!filled) {
+		pos += sizeof(int);
+		size -= sizeof(int);
+		name_len = yaffs_strnlen((YCHAR *) (xb + pos), size);
+		if (ncopied + name_len + 1 < bsize) {
+			memcpy(buf, xb + pos, name_len * sizeof(YCHAR));
+			buf += name_len;
+			*buf = '\0';
+			buf++;
+			if (sizeof(YCHAR) > 1) {
+				*buf = '\0';
+				buf++;
+			}
+			ncopied += (name_len + 1);
+		} else {
+			filled = 1;
+		}
+		pos += size;
+		if (pos < xb_size - (int)sizeof(int))
+			memcpy(&size, xb + pos, sizeof(int));
+		else
+			size = 0;
+	}
+	return ncopied;
+}
+
+int nval_hasvalues(const char *xb, int xb_size)
+{
+	return nval_used(xb, xb_size) > 0;
+}

flight/pios/common/libraries/yaffs2/yaffs_nand.c

@@ -0,0 +1,122 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_nand.h"
+#include "yaffs_tagscompat.h"
+
+#include "yaffs_getblockinfo.h"
+#include "yaffs_summary.h"
+
+static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
+{
+	return chunk - dev->chunk_offset;
+}
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+			     u8 *buffer, struct yaffs_ext_tags *tags)
+{
+	int result;
+	struct yaffs_ext_tags local_tags;
+	int flash_chunk = apply_chunk_offset(dev, nand_chunk);
+
+	dev->n_page_reads++;
+
+	/* If there are no tags provided use local tags. */
+	if (!tags)
+		tags = &local_tags;
+
+	result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags);
+	if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
+
+		struct yaffs_block_info *bi;
+		bi = yaffs_get_block_info(dev,
+					  nand_chunk /
+					  dev->param.chunks_per_block);
+		yaffs_handle_chunk_error(dev, bi);
+	}
+	return result;
+}
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+				int nand_chunk,
+				const u8 *buffer, struct yaffs_ext_tags *tags)
+{
+	int result;
+	int flash_chunk = apply_chunk_offset(dev, nand_chunk);
+
+	dev->n_page_writes++;
+
+	if (!tags) {
+		yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	tags->seq_number = dev->seq_number;
+	tags->chunk_used = 1;
+	yaffs_trace(YAFFS_TRACE_WRITE,
+		"Writing chunk %d tags %d %d",
+		nand_chunk, tags->obj_id, tags->chunk_id);
+
+	result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk,
+							buffer, tags);
+
+	yaffs_summary_add(dev, tags, nand_chunk);
+
+	return result;
+}
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
+{
+	block_no -= dev->block_offset;
+	dev->n_bad_markings++;
+
+	if (dev->param.disable_bad_block_marking)
+		return YAFFS_OK;
+
+	return dev->tagger.mark_bad_fn(dev, block_no);
+}
+
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+				 int block_no,
+				 enum yaffs_block_state *state,
+				 u32 *seq_number)
+{
+	block_no -= dev->block_offset;
+	return dev->tagger.query_block_fn(dev, block_no, state, seq_number);
+}
+
+int yaffs_erase_block(struct yaffs_dev *dev, int block_no)
+{
+	int result;
+
+	block_no -= dev->block_offset;
+	dev->n_erasures++;
+	result = dev->drv.drv_erase_fn(dev, block_no);
+	return result;
+}
+
+int yaffs_init_nand(struct yaffs_dev *dev)
+{
+	if (dev->drv.drv_initialise_fn)
+		return dev->drv.drv_initialise_fn(dev);
+	return YAFFS_OK;
+}
+
+int yaffs_deinit_nand(struct yaffs_dev *dev)
+{
+	if (dev->drv.drv_deinitialise_fn)
+		return dev->drv.drv_deinitialise_fn(dev);
+	return YAFFS_OK;
+}

flight/pios/common/libraries/yaffs2/yaffs_packedtags2.c

@@ -0,0 +1,197 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_packedtags2.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+/* This code packs a set of extended tags into a binary structure for
+ * NAND storage
+ */
+
+/* Some of the information is "extra" struff which can be packed in to
+ * speed scanning
+ * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
+ */
+
+/* Extra flags applied to chunk_id */
+
+#define EXTRA_HEADER_INFO_FLAG	0x80000000
+#define EXTRA_SHRINK_FLAG	0x40000000
+#define EXTRA_SHADOWS_FLAG	0x20000000
+#define EXTRA_SPARE_FLAGS	0x10000000
+
+#define ALL_EXTRA_FLAGS		0xf0000000
+
+/* Also, the top 4 bits of the object Id are set to the object type. */
+#define EXTRA_OBJECT_TYPE_SHIFT (28)
+#define EXTRA_OBJECT_TYPE_MASK  ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT)
+
+static void yaffs_dump_packed_tags2_tags_only(
+				const struct yaffs_packed_tags2_tags_only *ptt)
+{
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"packed tags obj %d chunk %d byte %d seq %d",
+		ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number);
+}
+
+static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
+{
+	yaffs_dump_packed_tags2_tags_only(&pt->t);
+}
+
+static void yaffs_dump_tags2(const struct yaffs_ext_tags *t)
+{
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d",
+		t->ecc_result, t->block_bad, t->chunk_used, t->obj_id,
+		t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number,
+		t->seq_number);
+
+}
+
+static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t)
+{
+	if (t->chunk_id != 0 || !t->extra_available)
+		return 0;
+
+	/* Check if the file size is too long to store */
+	if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE &&
+	    (t->extra_file_size >> 31) != 0)
+		return 0;
+	return 1;
+}
+
+void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt,
+				const struct yaffs_ext_tags *t)
+{
+	ptt->chunk_id = t->chunk_id;
+	ptt->seq_number = t->seq_number;
+	ptt->n_bytes = t->n_bytes;
+	ptt->obj_id = t->obj_id;
+
+	/* Only store extra tags for object headers.
+	 * If it is a file then only store  if the file size is short\
+	 * enough to fit.
+	 */
+	if (yaffs_check_tags_extra_packable(t)) {
+		/* Store the extra header info instead */
+		/* We save the parent object in the chunk_id */
+		ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id;
+		if (t->extra_is_shrink)
+			ptt->chunk_id |= EXTRA_SHRINK_FLAG;
+		if (t->extra_shadows)
+			ptt->chunk_id |= EXTRA_SHADOWS_FLAG;
+
+		ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+		ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT);
+
+		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+			ptt->n_bytes = t->extra_equiv_id;
+		else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+			ptt->n_bytes = (unsigned) t->extra_file_size;
+		else
+			ptt->n_bytes = 0;
+	}
+
+	yaffs_dump_packed_tags2_tags_only(ptt);
+	yaffs_dump_tags2(t);
+}
+
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+		      const struct yaffs_ext_tags *t, int tags_ecc)
+{
+	yaffs_pack_tags2_tags_only(&pt->t, t);
+
+	if (tags_ecc)
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
+				    sizeof(struct yaffs_packed_tags2_tags_only),
+				    &pt->ecc);
+}
+
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+				  struct yaffs_packed_tags2_tags_only *ptt)
+{
+	memset(t, 0, sizeof(struct yaffs_ext_tags));
+
+	if (ptt->seq_number == 0xffffffff)
+		return;
+
+	t->block_bad = 0;
+	t->chunk_used = 1;
+	t->obj_id = ptt->obj_id;
+	t->chunk_id = ptt->chunk_id;
+	t->n_bytes = ptt->n_bytes;
+	t->is_deleted = 0;
+	t->serial_number = 0;
+	t->seq_number = ptt->seq_number;
+
+	/* Do extra header info stuff */
+	if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) {
+		t->chunk_id = 0;
+		t->n_bytes = 0;
+
+		t->extra_available = 1;
+		t->extra_parent_id = ptt->chunk_id & (~(ALL_EXTRA_FLAGS));
+		t->extra_is_shrink = ptt->chunk_id & EXTRA_SHRINK_FLAG ? 1 : 0;
+		t->extra_shadows = ptt->chunk_id & EXTRA_SHADOWS_FLAG ? 1 : 0;
+		t->extra_obj_type = ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT;
+		t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+
+		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+			t->extra_equiv_id = ptt->n_bytes;
+		else
+			t->extra_file_size = ptt->n_bytes;
+	}
+	yaffs_dump_packed_tags2_tags_only(ptt);
+	yaffs_dump_tags2(t);
+}
+
+void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+			int tags_ecc)
+{
+	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+	if (pt->t.seq_number != 0xffffffff && tags_ecc) {
+		/* Chunk is in use and we need to do ECC */
+
+		struct yaffs_ecc_other ecc;
+		int result;
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
+				sizeof(struct yaffs_packed_tags2_tags_only),
+				&ecc);
+		result =
+		    yaffs_ecc_correct_other((unsigned char *)&pt->t,
+				sizeof(struct yaffs_packed_tags2_tags_only),
+				&pt->ecc, &ecc);
+		switch (result) {
+		case 0:
+			ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+			break;
+		case 1:
+			ecc_result = YAFFS_ECC_RESULT_FIXED;
+			break;
+		case -1:
+			ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+			break;
+		default:
+			ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+		}
+	}
+	yaffs_unpack_tags2_tags_only(t, &pt->t);
+
+	t->ecc_result = ecc_result;
+
+	yaffs_dump_packed_tags2(pt);
+	yaffs_dump_tags2(t);
+}

flight/pios/common/libraries/yaffs2/yaffs_qsort.c

@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "yportenv.h"
+/* #include <linux/string.h> */
+
+/*
+ * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
+ */
+#define swapcode(TYPE, parmi, parmj, n) do {		\
+	long i = (n) / sizeof(TYPE);			\
+	register TYPE *pi = (TYPE *) (parmi);		\
+	register TYPE *pj = (TYPE *) (parmj);		\
+	do {						\
+		register TYPE	t = *pi;		\
+		*pi++ = *pj;				\
+		*pj++ = t;				\
+	} while (--i > 0);				\
+} while (0)
+
+#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
+	es % sizeof(long) ? 2 : es == sizeof(long) ? 0 : 1;
+
+static inline void
+swapfunc(char *a, char *b, int n, int swaptype)
+{
+	if (swaptype <= 1)
+		swapcode(long, a, b, n);
+	else
+		swapcode(char, a, b, n);
+}
+
+#define yswap(a, b) do {					\
+	if (swaptype == 0) {				\
+		long t = *(long *)(a);			\
+		*(long *)(a) = *(long *)(b);		\
+		*(long *)(b) = t;			\
+	} else						\
+		swapfunc(a, b, es, swaptype);		\
+} while (0)
+
+#define vecswap(a, b, n)	if ((n) > 0) swapfunc(a, b, n, swaptype)
+
+static inline char *
+med3(char *a, char *b, char *c, int (*cmp)(const void *, const void *))
+{
+	return cmp(a, b) < 0 ?
+		(cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a))
+		: (cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c));
+}
+
+#ifndef min
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+#endif
+
+void
+yaffs_qsort(void *aa, size_t n, size_t es,
+	int (*cmp)(const void *, const void *))
+{
+	char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
+	int d, r, swaptype, swap_cnt;
+	register char *a = aa;
+
+loop:	SWAPINIT(a, es);
+	swap_cnt = 0;
+	if (n < 7) {
+		for (pm = (char *)a + es; pm < (char *) a + n * es; pm += es)
+			for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
+			     pl -= es)
+				yswap(pl, pl - es);
+		return;
+	}
+	pm = (char *)a + (n / 2) * es;
+	if (n > 7) {
+		pl = (char *)a;
+		pn = (char *)a + (n - 1) * es;
+		if (n > 40) {
+			d = (n / 8) * es;
+			pl = med3(pl, pl + d, pl + 2 * d, cmp);
+			pm = med3(pm - d, pm, pm + d, cmp);
+			pn = med3(pn - 2 * d, pn - d, pn, cmp);
+		}
+		pm = med3(pl, pm, pn, cmp);
+	}
+	yswap(a, pm);
+	pa = pb = (char *)a + es;
+
+	pc = pd = (char *)a + (n - 1) * es;
+	for (;;) {
+		while (pb <= pc && (r = cmp(pb, a)) <= 0) {
+			if (r == 0) {
+				swap_cnt = 1;
+				yswap(pa, pb);
+				pa += es;
+			}
+			pb += es;
+		}
+		while (pb <= pc && (r = cmp(pc, a)) >= 0) {
+			if (r == 0) {
+				swap_cnt = 1;
+				yswap(pc, pd);
+				pd -= es;
+			}
+			pc -= es;
+		}
+		if (pb > pc)
+			break;
+		yswap(pb, pc);
+		swap_cnt = 1;
+		pb += es;
+		pc -= es;
+	}
+	if (swap_cnt == 0) {  /* Switch to insertion sort */
+		for (pm = (char *) a + es; pm < (char *) a + n * es; pm += es)
+			for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
+			     pl -= es)
+				yswap(pl, pl - es);
+		return;
+	}
+
+	pn = (char *)a + n * es;
+	r = min(pa - (char *)a, pb - pa);
+	vecswap(a, pb - r, r);
+	r = min((long)(pd - pc), (long)(pn - pd - es));
+	vecswap(pb, pn - r, r);
+	r = pb - pa;
+	if (r > (int)es)
+		yaffs_qsort(a, r / es, es, cmp);
+	r = pd - pc;
+	if (r > (int)es) {
+		/* Iterate rather than recurse to save stack space */
+		a = pn - r;
+		n = r / es;
+		goto loop;
+	}
+/*		yaffs_qsort(pn - r, r / es, es, cmp);*/
+}

flight/pios/common/libraries/yaffs2/yaffs_summary.c

@@ -0,0 +1,315 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Summaries write the useful part of the tags for the chunks in a block into an
+ * an array which is written to the last n chunks of the block.
+ * Reading the summaries gives all the tags for the block in one read. Much
+ * faster.
+ *
+ * Chunks holding summaries are marked with tags making it look like
+ * they are part of a fake file.
+ *
+ * The summary could also be used during gc.
+ *
+ */
+
+#include "yaffs_summary.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_bitmap.h"
+
+/*
+ * The summary is built up in an array of summary tags.
+ * This gets written to the last one or two (maybe more) chunks in a block.
+ * A summary header is written as the first part of each chunk of summary data.
+ * The summary header must match or the summary is rejected.
+ */
+
+/* Summary tags don't need the sequence number because that is redundant. */
+struct yaffs_summary_tags {
+	unsigned obj_id;
+	unsigned chunk_id;
+	unsigned n_bytes;
+};
+
+/* Summary header */
+struct yaffs_summary_header {
+	unsigned version;	/* Must match current version */
+	unsigned block;		/* Must be this block */
+	unsigned seq;		/* Must be this sequence number */
+	unsigned sum;		/* Just add up all the bytes in the tags */
+};
+
+
+static void yaffs_summary_clear(struct yaffs_dev *dev)
+{
+	if (!dev->sum_tags)
+		return;
+	memset(dev->sum_tags, 0, dev->chunks_per_summary *
+		sizeof(struct yaffs_summary_tags));
+}
+
+
+void yaffs_summary_deinit(struct yaffs_dev *dev)
+{
+	kfree(dev->sum_tags);
+	dev->sum_tags = NULL;
+	kfree(dev->gc_sum_tags);
+	dev->gc_sum_tags = NULL;
+	dev->chunks_per_summary = 0;
+}
+
+int yaffs_summary_init(struct yaffs_dev *dev)
+{
+	int sum_bytes;
+	int chunks_used; /* Number of chunks used by summary */
+	int sum_tags_bytes;
+
+	sum_bytes = dev->param.chunks_per_block *
+			sizeof(struct yaffs_summary_tags);
+
+	chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/
+			(dev->data_bytes_per_chunk -
+				sizeof(struct yaffs_summary_header));
+
+	dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used;
+	sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
+	dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
+	if (!dev->sum_tags || !dev->gc_sum_tags) {
+		yaffs_summary_deinit(dev);
+		return YAFFS_FAIL;
+	}
+
+	yaffs_summary_clear(dev);
+
+	return YAFFS_OK;
+}
+
+static unsigned yaffs_summary_sum(struct yaffs_dev *dev)
+{
+	u8 *sum_buffer = (u8 *)dev->sum_tags;
+	int i;
+	unsigned sum = 0;
+
+	i = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	while (i > 0) {
+		sum += *sum_buffer;
+		sum_buffer++;
+		i--;
+	}
+
+	return sum;
+}
+
+static int yaffs_summary_write(struct yaffs_dev *dev, int blk)
+{
+	struct yaffs_ext_tags tags;
+	u8 *buffer;
+	u8 *sum_buffer = (u8 *)dev->sum_tags;
+	int n_bytes;
+	int chunk_in_nand;
+	int chunk_in_block;
+	int result;
+	int this_tx;
+	struct yaffs_summary_header hdr;
+	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+
+	buffer = yaffs_get_temp_buffer(dev);
+	n_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	memset(&tags, 0, sizeof(struct yaffs_ext_tags));
+	tags.obj_id = YAFFS_OBJECTID_SUMMARY;
+	tags.chunk_id = 1;
+	chunk_in_block = dev->chunks_per_summary;
+	chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block +
+						dev->chunks_per_summary;
+	hdr.version = YAFFS_SUMMARY_VERSION;
+	hdr.block = blk;
+	hdr.seq = bi->seq_number;
+	hdr.sum = yaffs_summary_sum(dev);
+
+	do {
+		this_tx = n_bytes;
+		if (this_tx > sum_bytes_per_chunk)
+			this_tx = sum_bytes_per_chunk;
+		memcpy(buffer, &hdr, sizeof(hdr));
+		memcpy(buffer + sizeof(hdr), sum_buffer, this_tx);
+		tags.n_bytes = this_tx + sizeof(hdr);
+		result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand,
+						buffer, &tags);
+
+		if (result != YAFFS_OK)
+			break;
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+		dev->n_free_chunks--;
+
+		n_bytes -= this_tx;
+		sum_buffer += this_tx;
+		chunk_in_nand++;
+		chunk_in_block++;
+		tags.chunk_id++;
+	} while (result == YAFFS_OK && n_bytes > 0);
+	yaffs_release_temp_buffer(dev, buffer);
+
+
+	if (result == YAFFS_OK)
+		bi->has_summary = 1;
+
+
+	return result;
+}
+
+int yaffs_summary_read(struct yaffs_dev *dev,
+			struct yaffs_summary_tags *st,
+			int blk)
+{
+	struct yaffs_ext_tags tags;
+	u8 *buffer;
+	u8 *sum_buffer = (u8 *)st;
+	int n_bytes;
+	int chunk_id;
+	int chunk_in_nand;
+	int chunk_in_block;
+	int result;
+	int this_tx;
+	struct yaffs_summary_header hdr;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
+#ifndef CONFIG_YAFFS_OP
+	int sum_tags_bytes;
+
+	sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+#endif //unused code
+
+	buffer = yaffs_get_temp_buffer(dev);
+	n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary;
+	chunk_in_block = dev->chunks_per_summary;
+	chunk_in_nand = blk * dev->param.chunks_per_block +
+							dev->chunks_per_summary;
+	chunk_id = 1;
+	do {
+		this_tx = n_bytes;
+		if (this_tx > sum_bytes_per_chunk)
+			this_tx = sum_bytes_per_chunk;
+		result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand,
+						buffer, &tags);
+
+		if ((int)tags.chunk_id != chunk_id ||
+			tags.obj_id != YAFFS_OBJECTID_SUMMARY ||
+			tags.chunk_used == 0 ||
+			tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
+			tags.n_bytes != (this_tx + sizeof(hdr)))
+				result = YAFFS_FAIL;
+		if (result != YAFFS_OK)
+			break;
+
+		if (st == dev->sum_tags) {
+			/* If we're scanning then update the block info */
+			yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+			bi->pages_in_use++;
+		}
+		memcpy(&hdr, buffer, sizeof(hdr));
+		memcpy(sum_buffer, buffer + sizeof(hdr), this_tx);
+		n_bytes -= this_tx;
+		sum_buffer += this_tx;
+		chunk_in_nand++;
+		chunk_in_block++;
+		chunk_id++;
+	} while (result == YAFFS_OK && n_bytes > 0);
+	yaffs_release_temp_buffer(dev, buffer);
+
+	if (result == YAFFS_OK) {
+		/* Verify header */
+		if (hdr.version != YAFFS_SUMMARY_VERSION ||
+		    hdr.seq != bi->seq_number ||
+		    hdr.sum != yaffs_summary_sum(dev))
+			result = YAFFS_FAIL;
+	}
+
+	if (st == dev->sum_tags && result == YAFFS_OK)
+		bi->has_summary = 1;
+
+	return result;
+}
+
+int yaffs_summary_add(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_nand)
+{
+	struct yaffs_packed_tags2_tags_only tags_only;
+	struct yaffs_summary_tags *sum_tags;
+	int block_in_nand = chunk_in_nand / dev->param.chunks_per_block;
+	int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block;
+
+	if (!dev->sum_tags)
+		return YAFFS_OK;
+
+	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
+		yaffs_pack_tags2_tags_only(&tags_only, tags);
+		sum_tags = &dev->sum_tags[chunk_in_block];
+		sum_tags->chunk_id = tags_only.chunk_id;
+		sum_tags->n_bytes = tags_only.n_bytes;
+		sum_tags->obj_id = tags_only.obj_id;
+
+		if (chunk_in_block == dev->chunks_per_summary - 1) {
+			/* Time to write out the summary */
+			yaffs_summary_write(dev, block_in_nand);
+			yaffs_summary_clear(dev);
+			yaffs_skip_rest_of_block(dev);
+		}
+	}
+	return YAFFS_OK;
+}
+
+int yaffs_summary_fetch(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block)
+{
+	struct yaffs_packed_tags2_tags_only tags_only;
+	struct yaffs_summary_tags *sum_tags;
+	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
+		sum_tags = &dev->sum_tags[chunk_in_block];
+		tags_only.chunk_id = sum_tags->chunk_id;
+		tags_only.n_bytes = sum_tags->n_bytes;
+		tags_only.obj_id = sum_tags->obj_id;
+		yaffs_unpack_tags2_tags_only(tags, &tags_only);
+		return YAFFS_OK;
+	}
+	return YAFFS_FAIL;
+}
+
+void yaffs_summary_gc(struct yaffs_dev *dev, int blk)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+	int i;
+
+	if (!bi->has_summary)
+		return;
+
+	for (i = dev->chunks_per_summary;
+	     i < dev->param.chunks_per_block;
+	     i++) {
+		if (yaffs_check_chunk_bit(dev, blk, i)) {
+			yaffs_clear_chunk_bit(dev, blk, i);
+			bi->pages_in_use--;
+			dev->n_free_chunks++;
+		}
+	}
+}

flight/pios/common/libraries/yaffs2/yaffs_tagscompat.c

@@ -0,0 +1,381 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_ecc.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_trace.h"
+
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
+
+
+/********** Tags ECC calculations  *********/
+
+
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
+{
+	/* Calculate an ecc */
+	unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
+	unsigned i, j;
+	unsigned ecc = 0;
+	unsigned bit = 0;
+
+	tags->ecc = 0;
+
+	for (i = 0; i < 8; i++) {
+		for (j = 1; j & 0xff; j <<= 1) {
+			bit++;
+			if (b[i] & j)
+				ecc ^= bit;
+		}
+	}
+	tags->ecc = ecc;
+}
+
+int yaffs_check_tags_ecc(struct yaffs_tags *tags)
+{
+	unsigned ecc = tags->ecc;
+
+	yaffs_calc_tags_ecc(tags);
+
+	ecc ^= tags->ecc;
+
+	if (ecc && ecc <= 64) {
+		/* TODO: Handle the failure better. Retire? */
+		unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
+
+		ecc--;
+
+		b[ecc / 8] ^= (1 << (ecc & 7));
+
+		/* Now recvalc the ecc */
+		yaffs_calc_tags_ecc(tags);
+
+		return 1;	/* recovered error */
+	} else if (ecc) {
+		/* Wierd ecc failure value */
+		/* TODO Need to do somethiong here */
+		return -1;	/* unrecovered error */
+	}
+	return 0;
+}
+
+/********** Tags **********/
+
+static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
+				     struct yaffs_tags *tags_ptr)
+{
+	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
+
+	yaffs_calc_tags_ecc(tags_ptr);
+
+	spare_ptr->tb0 = tu->as_bytes[0];
+	spare_ptr->tb1 = tu->as_bytes[1];
+	spare_ptr->tb2 = tu->as_bytes[2];
+	spare_ptr->tb3 = tu->as_bytes[3];
+	spare_ptr->tb4 = tu->as_bytes[4];
+	spare_ptr->tb5 = tu->as_bytes[5];
+	spare_ptr->tb6 = tu->as_bytes[6];
+	spare_ptr->tb7 = tu->as_bytes[7];
+}
+
+static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
+				      struct yaffs_spare *spare_ptr,
+				      struct yaffs_tags *tags_ptr)
+{
+	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
+	int result;
+
+	tu->as_bytes[0] = spare_ptr->tb0;
+	tu->as_bytes[1] = spare_ptr->tb1;
+	tu->as_bytes[2] = spare_ptr->tb2;
+	tu->as_bytes[3] = spare_ptr->tb3;
+	tu->as_bytes[4] = spare_ptr->tb4;
+	tu->as_bytes[5] = spare_ptr->tb5;
+	tu->as_bytes[6] = spare_ptr->tb6;
+	tu->as_bytes[7] = spare_ptr->tb7;
+
+	result = yaffs_check_tags_ecc(tags_ptr);
+	if (result > 0)
+		dev->n_tags_ecc_fixed++;
+	else if (result < 0)
+		dev->n_tags_ecc_unfixed++;
+}
+
+static void yaffs_spare_init(struct yaffs_spare *spare)
+{
+	memset(spare, 0xff, sizeof(struct yaffs_spare));
+}
+
+static int yaffs_wr_nand(struct yaffs_dev *dev,
+			 int nand_chunk, const u8 *data,
+			 struct yaffs_spare *spare)
+{
+	int data_size = dev->data_bytes_per_chunk;
+
+	return dev->drv.drv_write_chunk_fn(dev, nand_chunk,
+				data, data_size,
+				(u8 *) spare, sizeof(*spare));
+}
+
+static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
+			       int nand_chunk,
+			       u8 *data,
+			       struct yaffs_spare *spare,
+			       enum yaffs_ecc_result *ecc_result,
+			       int correct_errors)
+{
+	int ret_val;
+	struct yaffs_spare local_spare;
+	int data_size;
+	int spare_size;
+	int ecc_result1, ecc_result2;
+	u8 calc_ecc[3];
+
+	if (!spare) {
+		/* If we don't have a real spare, then we use a local one. */
+		/* Need this for the calculation of the ecc */
+		spare = &local_spare;
+	}
+	data_size = dev->data_bytes_per_chunk;
+	spare_size = sizeof(struct yaffs_spare);
+
+	if (dev->param.use_nand_ecc)
+		return dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+						data, data_size,
+						(u8 *) spare, spare_size,
+						ecc_result);
+
+
+	/* Handle the ECC at this level. */
+
+	ret_val = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+						 data, data_size,
+						 (u8 *)spare, spare_size,
+						NULL);
+	if (!data || !correct_errors)
+		return ret_val;
+
+	/* Do ECC correction if needed. */
+	yaffs_ecc_calc(data, calc_ecc);
+	ecc_result1 = yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
+	yaffs_ecc_calc(&data[256], calc_ecc);
+	ecc_result2 = yaffs_ecc_correct(&data[256], spare->ecc2, calc_ecc);
+
+	if (ecc_result1 > 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error fix performed on chunk %d:0",
+			nand_chunk);
+		dev->n_ecc_fixed++;
+	} else if (ecc_result1 < 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error unfixed on chunk %d:0",
+			nand_chunk);
+		dev->n_ecc_unfixed++;
+	}
+
+	if (ecc_result2 > 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error fix performed on chunk %d:1",
+			nand_chunk);
+		dev->n_ecc_fixed++;
+	} else if (ecc_result2 < 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error unfixed on chunk %d:1",
+			nand_chunk);
+		dev->n_ecc_unfixed++;
+	}
+
+	if (ecc_result1 || ecc_result2) {
+		/* We had a data problem on this page */
+		yaffs_handle_rd_data_error(dev, nand_chunk);
+	}
+
+	if (ecc_result1 < 0 || ecc_result2 < 0)
+		*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+	else if (ecc_result1 > 0 || ecc_result2 > 0)
+		*ecc_result = YAFFS_ECC_RESULT_FIXED;
+	else
+		*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+	return ret_val;
+}
+
+/*
+ * Functions for robustisizing
+ */
+
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
+{
+	int flash_block = nand_chunk / dev->param.chunks_per_block;
+
+	/* Mark the block for retirement */
+	yaffs_get_block_info(dev, flash_block + dev->block_offset)->
+		needs_retiring = 1;
+	yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		"**>>Block %d marked for retirement",
+		flash_block);
+
+	/* TODO:
+	 * Just do a garbage collection on the affected block
+	 * then retire the block
+	 * NB recursion
+	 */
+}
+
+static int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 const u8 *data, const struct yaffs_ext_tags *ext_tags)
+{
+	struct yaffs_spare spare;
+	struct yaffs_tags tags;
+
+	yaffs_spare_init(&spare);
+
+	if (ext_tags->is_deleted)
+		spare.page_status = 0;
+	else {
+		tags.obj_id = ext_tags->obj_id;
+		tags.chunk_id = ext_tags->chunk_id;
+
+		tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1);
+
+		if (dev->data_bytes_per_chunk >= 1024)
+			tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
+		else
+			tags.n_bytes_msb = 3;
+
+		tags.serial_number = ext_tags->serial_number;
+
+		if (!dev->param.use_nand_ecc && data) {
+			yaffs_ecc_calc(data, spare.ecc1);
+			yaffs_ecc_calc(&data[256], spare.ecc2);
+		}
+
+		yaffs_load_tags_to_spare(&spare, &tags);
+	}
+	return yaffs_wr_nand(dev, nand_chunk, data, &spare);
+}
+
+static int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 u8 *data, struct yaffs_ext_tags *ext_tags)
+{
+	struct yaffs_spare spare;
+	struct yaffs_tags tags;
+	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+	static struct yaffs_spare spare_ff;
+	static int init;
+	int deleted;
+
+	if (!init) {
+		memset(&spare_ff, 0xff, sizeof(spare_ff));
+		init = 1;
+	}
+
+	if (!yaffs_rd_chunk_nand(dev, nand_chunk,
+					data, &spare, &ecc_result, 1))
+		return YAFFS_FAIL;
+
+	/* ext_tags may be NULL */
+	if (!ext_tags)
+		return YAFFS_OK;
+
+	deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;
+
+	ext_tags->is_deleted = deleted;
+	ext_tags->ecc_result = ecc_result;
+	ext_tags->block_bad = 0;	/* We're reading it */
+	/* therefore it is not a bad block */
+	ext_tags->chunk_used =
+		memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0;
+
+	if (ext_tags->chunk_used) {
+		yaffs_get_tags_from_spare(dev, &spare, &tags);
+		ext_tags->obj_id = tags.obj_id;
+		ext_tags->chunk_id = tags.chunk_id;
+		ext_tags->n_bytes = tags.n_bytes_lsb;
+
+		if (dev->data_bytes_per_chunk >= 1024)
+			ext_tags->n_bytes |=
+				(((unsigned)tags.n_bytes_msb) << 10);
+
+		ext_tags->serial_number = tags.serial_number;
+	}
+
+	return YAFFS_OK;
+}
+
+static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
+{
+	struct yaffs_spare spare;
+
+	memset(&spare, 0xff, sizeof(struct yaffs_spare));
+
+	spare.block_status = 'Y';
+
+	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
+		      &spare);
+	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
+		      NULL, &spare);
+
+	return YAFFS_OK;
+}
+
+static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+				  int block_no,
+				  enum yaffs_block_state *state,
+				  u32 *seq_number)
+{
+	struct yaffs_spare spare0, spare1;
+	static struct yaffs_spare spare_ff;
+	static int init;
+	enum yaffs_ecc_result dummy;
+
+	if (!init) {
+		memset(&spare_ff, 0xff, sizeof(spare_ff));
+		init = 1;
+	}
+
+	*seq_number = 0;
+
+	/* Look for bad block markers in the first two chunks */
+	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block,
+			    NULL, &spare0, &dummy, 0);
+	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
+			    NULL, &spare1, &dummy, 0);
+
+	if (hweight8(spare0.block_status & spare1.block_status) < 7)
+		*state = YAFFS_BLOCK_STATE_DEAD;
+	else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
+		*state = YAFFS_BLOCK_STATE_EMPTY;
+	else
+		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
+
+	return YAFFS_OK;
+}
+
+void yaffs_tags_compat_install(struct yaffs_dev *dev)
+{
+	if(dev->param.is_yaffs2)
+		return;
+	if(!dev->tagger.write_chunk_tags_fn)
+		dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_wr;
+	if(!dev->tagger.read_chunk_tags_fn)
+		dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_rd;
+	if(!dev->tagger.query_block_fn)
+		dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
+	if(!dev->tagger.mark_bad_fn)
+		dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
+}

flight/pios/common/libraries/yaffs2/yaffs_tagsmarshall.c

@@ -0,0 +1,199 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_packedtags2.h"
+
+static int yaffs_tags_marshall_write(struct yaffs_dev *dev,
+				    int nand_chunk, const u8 *data,
+				    const struct yaffs_ext_tags *tags)
+{
+	struct yaffs_packed_tags2 pt;
+	int retval;
+
+	int packed_tags_size =
+	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+	void *packed_tags_ptr =
+	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"yaffs_tags_marshall_write chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+	/* For yaffs2 writing there must be both data and tags.
+	 * If we're using inband tags, then the tags are stuffed into
+	 * the end of the data buffer.
+	 */
+	if (!data || !tags)
+		BUG();
+	else if (dev->param.inband_tags) {
+		struct yaffs_packed_tags2_tags_only *pt2tp;
+		pt2tp =
+		    (struct yaffs_packed_tags2_tags_only *)(data +
+							dev->
+							data_bytes_per_chunk);
+		yaffs_pack_tags2_tags_only(pt2tp, tags);
+	} else {
+		yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
+	}
+
+	retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
+			data, dev->param.total_bytes_per_chunk,
+			(dev->param.inband_tags) ? NULL : packed_tags_ptr,
+			(dev->param.inband_tags) ? 0 : packed_tags_size);
+
+	return retval;
+}
+
+static int yaffs_tags_marshall_read(struct yaffs_dev *dev,
+				   int nand_chunk, u8 *data,
+				   struct yaffs_ext_tags *tags)
+{
+	//int retval = 0;
+	int local_data = 0;
+	u8 spare_buffer[100];
+	enum yaffs_ecc_result ecc_result;
+
+	struct yaffs_packed_tags2 pt;
+
+	int packed_tags_size =
+	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+	void *packed_tags_ptr =
+	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"yaffs_tags_marshall_read chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+	if (dev->param.inband_tags) {
+		if (!data) {
+			local_data = 1;
+			data = yaffs_get_temp_buffer(dev);
+		}
+	}
+
+	if (dev->param.inband_tags || (data && !tags))
+		dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+					data, dev->param.total_bytes_per_chunk,
+					NULL, 0,
+					&ecc_result); //TODO check retval
+	else if (tags)
+		dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+					data, dev->param.total_bytes_per_chunk,
+					spare_buffer, packed_tags_size,
+					&ecc_result); //TODO check retval
+	else
+		BUG();
+
+
+	if (dev->param.inband_tags) {
+		if (tags) {
+			struct yaffs_packed_tags2_tags_only *pt2tp;
+			pt2tp =
+				(struct yaffs_packed_tags2_tags_only *)
+				&data[dev->data_bytes_per_chunk];
+			yaffs_unpack_tags2_tags_only(tags, pt2tp);
+		}
+	} else if (tags) {
+		memcpy(packed_tags_ptr, spare_buffer, packed_tags_size);
+		yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
+	}
+
+	if (local_data)
+		yaffs_release_temp_buffer(dev, data);
+
+	if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
+		tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+		dev->n_ecc_unfixed++;
+	}
+
+	if (tags && ecc_result == YAFFS_ECC_RESULT_FIXED) {
+		if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR)
+			tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
+		dev->n_ecc_fixed++;
+	}
+
+	if (ecc_result < YAFFS_ECC_RESULT_UNFIXED)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no,
+			       enum yaffs_block_state *state,
+			       u32 *seq_number)
+{
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d",
+			block_no);
+
+	retval = dev->drv.drv_check_bad_fn(dev, block_no);
+
+	if (retval== YAFFS_FAIL) {
+		yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
+
+		*state = YAFFS_BLOCK_STATE_DEAD;
+		*seq_number = 0;
+	} else {
+		struct yaffs_ext_tags t;
+
+		yaffs_tags_marshall_read(dev,
+				    block_no * dev->param.chunks_per_block,
+				    NULL, &t);
+
+		if (t.chunk_used) {
+			*seq_number = t.seq_number;
+			*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
+		} else {
+			*seq_number = 0;
+			*state = YAFFS_BLOCK_STATE_EMPTY;
+		}
+	}
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"block query returns  seq %d state %d",
+		*seq_number, *state);
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no)
+{
+	return dev->drv.drv_mark_bad_fn(dev, block_no);
+
+}
+
+
+void yaffs_tags_marshall_install(struct yaffs_dev *dev)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!dev->tagger.write_chunk_tags_fn)
+		dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write;
+
+	if (!dev->tagger.read_chunk_tags_fn)
+		dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read;
+
+	if (!dev->tagger.query_block_fn)
+		dev->tagger.query_block_fn = yaffs_tags_marshall_query_block;
+
+	if (!dev->tagger.mark_bad_fn)
+		dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad;
+
+}

flight/pios/common/libraries/yaffs2/yaffs_verify.c

@@ -0,0 +1,529 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_verify.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+int yaffs_skip_verification(struct yaffs_dev *dev)
+{
+	(void) dev;
+	return !(yaffs_trace_mask &
+		 (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_full_verification(struct yaffs_dev *dev)
+{
+	(void) dev;
+	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
+{
+	(void) dev;
+	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+static const char * const block_state_name[] = {
+	"Unknown",
+	"Needs scan",
+	"Scanning",
+	"Empty",
+	"Allocating",
+	"Full",
+	"Dirty",
+	"Checkpoint",
+	"Collecting",
+	"Dead"
+};
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
+{
+	int actually_used;
+	int in_use;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Report illegal runtime states */
+	if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has undefined state %d",
+			n, bi->block_state);
+
+	switch (bi->block_state) {
+	case YAFFS_BLOCK_STATE_UNKNOWN:
+	case YAFFS_BLOCK_STATE_SCANNING:
+	case YAFFS_BLOCK_STATE_NEEDS_SCAN:
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has bad run-state %s",
+			n, block_state_name[bi->block_state]);
+	}
+
+	/* Check pages in use and soft deletions are legal */
+
+	actually_used = bi->pages_in_use - bi->soft_del_pages;
+
+	if (bi->pages_in_use < 0 ||
+	    bi->pages_in_use > dev->param.chunks_per_block ||
+	    bi->soft_del_pages < 0 ||
+	    bi->soft_del_pages > dev->param.chunks_per_block ||
+	    actually_used < 0 || actually_used > dev->param.chunks_per_block)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has illegal values pages_in_used %d soft_del_pages %d",
+			n, bi->pages_in_use, bi->soft_del_pages);
+
+	/* Check chunk bitmap legal */
+	in_use = yaffs_count_chunk_bits(dev, n);
+	if (in_use != bi->pages_in_use)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
+			n, bi->pages_in_use, in_use);
+}
+
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+				struct yaffs_block_info *bi, int n)
+{
+	yaffs_verify_blk(dev, bi, n);
+
+	/* After collection the block should be in the erased state */
+
+	if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
+	    bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Block %d is in state %d after gc, should be erased",
+			n, bi->block_state);
+	}
+}
+
+void yaffs_verify_blocks(struct yaffs_dev *dev)
+{
+	int i;
+	int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
+	int illegal_states = 0;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	memset(state_count, 0, sizeof(state_count));
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+		yaffs_verify_blk(dev, bi, i);
+
+		if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
+			state_count[bi->block_state]++;
+		else
+			illegal_states++;
+	}
+
+	yaffs_trace(YAFFS_TRACE_VERIFY,	"Block summary");
+
+	yaffs_trace(YAFFS_TRACE_VERIFY,
+		"%d blocks have illegal states",
+		illegal_states);
+	if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Too many allocating blocks");
+
+	for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"%s %d blocks",
+			block_state_name[i], state_count[i]);
+
+	if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Checkpoint block count wrong dev %d count %d",
+			dev->blocks_in_checkpt,
+			state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
+
+	if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Erased block count wrong dev %d count %d",
+			dev->n_erased_blocks,
+			state_count[YAFFS_BLOCK_STATE_EMPTY]);
+
+	if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Too many collecting blocks %d (max is 1)",
+			state_count[YAFFS_BLOCK_STATE_COLLECTING]);
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in
+ * which case those tests will not be performed.
+ */
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+		     struct yaffs_ext_tags *tags, int parent_check)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	if (!(tags && obj && oh)) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Verifying object header tags %p obj %p oh %p",
+			tags, obj, oh);
+		return;
+	}
+
+	if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+	    oh->type > YAFFS_OBJECT_TYPE_MAX)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header type is illegal value 0x%x",
+			tags->obj_id, oh->type);
+
+	if (tags->obj_id != obj->obj_id)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch obj_id %d",
+			tags->obj_id, obj->obj_id);
+
+	/*
+	 * Check that the object's parent ids match if parent_check requested.
+	 *
+	 * Tests do not apply to the root object.
+	 */
+
+	if (parent_check && tags->obj_id > 1 && !obj->parent)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch parent_id %d obj->parent is NULL",
+			tags->obj_id, oh->parent_obj_id);
+
+	if (parent_check && obj->parent &&
+	    oh->parent_obj_id != (s32)obj->parent->obj_id &&
+	    (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
+	     obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch parent_id %d parent_obj_id %d",
+			tags->obj_id, oh->parent_obj_id,
+			obj->parent->obj_id);
+
+	if (tags->obj_id > 1 && oh->name[0] == 0)	/* Null name */
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header name is NULL",
+			obj->obj_id);
+
+	if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff)	/* Junk name */
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header name is 0xff",
+			obj->obj_id);
+}
+
+void yaffs_verify_file(struct yaffs_obj *obj)
+{
+	u32 x;
+	int required_depth;
+	//int actual_depth;
+	int last_chunk;
+	u32 offset_in_chunk;
+	u32 the_chunk;
+
+	u32 i;
+	struct yaffs_dev *dev;
+	struct yaffs_ext_tags tags;
+	struct yaffs_tnode *tn;
+	u32 obj_id;
+
+	if (!obj)
+		return;
+
+	if (yaffs_skip_verification(obj->my_dev))
+		return;
+
+	dev = obj->my_dev;
+	obj_id = obj->obj_id;
+
+
+	/* Check file size is consistent with tnode depth */
+	yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size,
+				&last_chunk, &offset_in_chunk);
+	last_chunk++;
+	x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
+	while (x > 0) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		required_depth++;
+	}
+
+	// actual_depth = obj->variant.file_variant.top_level;  // unused
+
+	/* Check that the chunks in the tnode tree are all correct.
+	 * We do this by scanning through the tnode tree and
+	 * checking the tags for every chunk match.
+	 */
+
+	if (yaffs_skip_nand_verification(dev))
+		return;
+
+	for (i = 1; i <= (u32)last_chunk; i++) {
+		tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
+
+		if (!tn)
+			continue;
+
+		the_chunk = yaffs_get_group_base(dev, tn, i);
+		if (the_chunk > 0) {
+			yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+						 &tags);
+			if (tags.obj_id != obj_id || tags.chunk_id != i)
+				yaffs_trace(YAFFS_TRACE_VERIFY,
+					"Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
+					obj_id, i, the_chunk,
+					tags.obj_id, tags.chunk_id);
+		}
+	}
+}
+
+void yaffs_verify_link(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	/* Verify sane equivalent object */
+}
+
+void yaffs_verify_symlink(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	/* Verify symlink string */
+}
+
+void yaffs_verify_special(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+}
+
+void yaffs_verify_obj(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
+	u32 chunk_min;
+	u32 chunk_max;
+	u32 chunk_id_ok;
+	u32 chunk_in_range;
+	u32 chunk_wrongly_deleted;
+	u32 chunk_valid;
+
+	if (!obj)
+		return;
+
+	if (obj->being_created)
+		return;
+
+	dev = obj->my_dev;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Check sane object header chunk */
+
+	chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
+	chunk_max =
+	    (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
+
+	chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
+			  ((unsigned)(obj->hdr_chunk)) <= chunk_max);
+	chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
+	chunk_valid = chunk_in_range &&
+	    yaffs_check_chunk_bit(dev,
+				  obj->hdr_chunk / dev->param.chunks_per_block,
+				  obj->hdr_chunk % dev->param.chunks_per_block);
+	chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
+
+	if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has chunk_id %d %s %s",
+			obj->obj_id, obj->hdr_chunk,
+			chunk_id_ok ? "" : ",out of range",
+			chunk_wrongly_deleted ? ",marked as deleted" : "");
+
+	if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
+		struct yaffs_ext_tags tags;
+		struct yaffs_obj_hdr *oh;
+		u8 *buffer = yaffs_get_temp_buffer(dev);
+
+		oh = (struct yaffs_obj_hdr *)buffer;
+
+		yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
+
+		yaffs_verify_oh(obj, oh, &tags, 1);
+
+		yaffs_release_temp_buffer(dev, buffer);
+	}
+
+	/* Verify it has a parent */
+	if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has parent pointer %p which does not look like an object",
+			obj->obj_id, obj->parent);
+	}
+
+	/* Verify parent is a directory */
+	if (obj->parent &&
+	    obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d's parent is not a directory (type %d)",
+			obj->obj_id, obj->parent->variant_type);
+	}
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_verify_file(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_verify_symlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_verify_dir(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_verify_link(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_verify_special(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+	default:
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has illegaltype %d",
+		   obj->obj_id, obj->variant_type);
+		break;
+	}
+}
+
+void yaffs_verify_objects(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	int i;
+	struct list_head *lh;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Iterate through the objects in each hash entry */
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each(lh, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			yaffs_verify_obj(obj);
+		}
+	}
+}
+
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
+{
+	struct list_head *lh;
+	struct yaffs_obj *list_obj;
+	int count = 0;
+
+	if (!obj) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
+		BUG();
+		return;
+	}
+
+	if (yaffs_skip_verification(obj->my_dev))
+		return;
+
+	if (!obj->parent) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
+		BUG();
+		return;
+	}
+
+	if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
+		BUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	list_for_each(lh, &obj->parent->variant.dir_variant.children) {
+		list_obj = list_entry(lh, struct yaffs_obj, siblings);
+		yaffs_verify_obj(list_obj);
+		if (obj == list_obj)
+			count++;
+	}
+
+	if (count != 1) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Object in directory %d times",
+			count);
+		BUG();
+	}
+}
+
+void yaffs_verify_dir(struct yaffs_obj *directory)
+{
+	struct list_head *lh;
+	struct yaffs_obj *list_obj;
+
+	if (!directory) {
+		BUG();
+		return;
+	}
+
+	if (yaffs_skip_full_verification(directory->my_dev))
+		return;
+
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Directory has wrong type: %d",
+			directory->variant_type);
+		BUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	list_for_each(lh, &directory->variant.dir_variant.children) {
+		list_obj = list_entry(lh, struct yaffs_obj, siblings);
+		if (list_obj->parent != directory) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Object in directory list has wrong parent %p",
+				list_obj->parent);
+			BUG();
+		}
+		yaffs_verify_obj_in_dir(list_obj);
+	}
+}
+
+static int yaffs_free_verification_failures;
+
+void yaffs_verify_free_chunks(struct yaffs_dev *dev)
+{
+	int counted;
+	int difference;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	counted = yaffs_count_free_chunks(dev);
+
+	difference = dev->n_free_chunks - counted;
+
+	if (difference) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Freechunks verification failure %d %d %d",
+			dev->n_free_chunks, counted, difference);
+		yaffs_free_verification_failures++;
+	}
+}
+
+int yaffs_verify_file_sane(struct yaffs_obj *in)
+{
+	(void) in;
+	return YAFFS_OK;
+}

flight/pios/common/libraries/yaffs2/yaffs_yaffs1.c

@@ -0,0 +1,428 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+#include "yaffs_attribs.h"
+
+int yaffs1_scan(struct yaffs_dev *dev)
+{
+	struct yaffs_ext_tags tags;
+	int blk;
+	//int result;
+	int chunk;
+	int c;
+	int deleted;
+	enum yaffs_block_state state;
+	LIST_HEAD(hard_list);
+	struct yaffs_block_info *bi;
+	u32 seq_number;
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_obj *in;
+	struct yaffs_obj *parent;
+	int alloc_failed = 0;
+	struct yaffs_shadow_fixer *shadow_fixers = NULL;
+	u8 *chunk_data;
+
+	yaffs_trace(YAFFS_TRACE_SCAN,
+		"yaffs1_scan starts  intstartblk %d intendblk %d...",
+		dev->internal_start_block, dev->internal_end_block);
+
+	chunk_data = yaffs_get_temp_buffer(dev);
+
+	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->block_info;
+	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+	     blk++) {
+		yaffs_clear_chunk_bits(dev, blk);
+		bi->pages_in_use = 0;
+		bi->soft_del_pages = 0;
+
+		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+		bi->block_state = state;
+		bi->seq_number = seq_number;
+
+		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+			"Block scanning block %d state %d seq %d",
+			blk, state, seq_number);
+
+		if (state == YAFFS_BLOCK_STATE_DEAD) {
+			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+				"block %d is bad", blk);
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+			dev->n_erased_blocks++;
+			dev->n_free_chunks += dev->param.chunks_per_block;
+		}
+		bi++;
+	}
+
+	/* For each block.... */
+	for (blk = dev->internal_start_block;
+	     !alloc_failed && blk <= dev->internal_end_block; blk++) {
+
+		cond_resched();
+
+		bi = yaffs_get_block_info(dev, blk);
+		state = bi->block_state;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning.... */
+		for (c = 0;
+			!alloc_failed && c < dev->param.chunks_per_block &&
+			state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) {
+			/* Read the tags and decide what to do */
+			chunk = blk * dev->param.chunks_per_block + c;
+
+			if (!yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags))
+
+			{
+			    yaffs_trace(YAFFS_TRACE_ERROR, "yaffs1_scan: unhandled error from rd_chunk_tags_nand");
+			}
+
+			/* Let's have a good look at this chunk... */
+
+			if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED ||
+			    tags.is_deleted) {
+				/* YAFFS1 only...
+				 * A deleted chunk
+				 */
+				deleted++;
+				dev->n_free_chunks++;
+			} else if (!tags.chunk_used) {
+				/* An unassigned chunk in the block
+				 * This means that either the block is empty or
+				 * this is the one being allocated from
+				 */
+
+				if (c == 0) {
+					/* We're looking at the first chunk in
+					 *the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->n_erased_blocks++;
+				} else {
+					/* this is the block being allocated */
+					yaffs_trace(YAFFS_TRACE_SCAN,
+						" Allocating from %d %d",
+						blk, c);
+					state = YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->alloc_block = blk;
+					dev->alloc_page = c;
+					dev->alloc_block_finder = blk;
+
+				}
+
+				dev->n_free_chunks +=
+				    (dev->param.chunks_per_block - c);
+			} else if (tags.chunk_id > 0) {
+				/* chunk_id > 0 so it is a data chunk... */
+				unsigned int endpos;
+
+				yaffs_set_chunk_bit(dev, blk, c);
+				bi->pages_in_use++;
+
+				in = yaffs_find_or_create_by_number(dev,
+							tags.obj_id,
+							YAFFS_OBJECT_TYPE_FILE);
+				/* PutChunkIntoFile checks for a clash
+				 * (two data chunks with the same chunk_id).
+				 */
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in) {
+					if (!yaffs_put_chunk_in_file
+					    (in, tags.chunk_id, chunk, 1))
+						alloc_failed = 1;
+				}
+
+				endpos =
+				    (tags.chunk_id - 1) *
+				    dev->data_bytes_per_chunk +
+				    tags.n_bytes;
+				if (in &&
+				    in->variant_type ==
+				     YAFFS_OBJECT_TYPE_FILE &&
+				    in->variant.file_variant.scanned_size <
+				      (s32)endpos) {
+					in->variant.file_variant.scanned_size =
+					    endpos;
+					if (!dev->param.use_header_file_size) {
+						in->variant.
+						    file_variant.file_size =
+						    in->variant.
+						    file_variant.scanned_size;
+					}
+
+				}
+			} else {
+				/* chunk_id == 0, so it is an ObjectHeader.
+				 * Make the object
+				 */
+				yaffs_set_chunk_bit(dev, blk, c);
+				bi->pages_in_use++;
+
+				if (!yaffs_rd_chunk_tags_nand(dev, chunk, chunk_data, NULL))
+
+				{
+				    yaffs_trace(YAFFS_TRACE_ERROR, 	
+					"yaffs1_scan: unhandled error from rd_chunk_tags_nand");
+				}
+
+				oh = (struct yaffs_obj_hdr *)chunk_data;
+
+				in = yaffs_find_by_number(dev, tags.obj_id);
+				if (in && in->variant_type != oh->type) {
+					/* This should not happen, but somehow
+					 * Wev'e ended up with an obj_id that
+					 * has been reused but not yet deleted,
+					 * and worse still it has changed type.
+					 * Delete the old object.
+					 */
+
+					yaffs_del_obj(in);
+					in = NULL;
+				}
+
+				in = yaffs_find_or_create_by_number(dev,
+								tags.obj_id,
+								oh->type);
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in && oh->shadows_obj > 0) {
+
+					struct yaffs_shadow_fixer *fixer;
+					fixer =
+						kmalloc(sizeof
+						(struct yaffs_shadow_fixer),
+						GFP_NOFS);
+					if (fixer) {
+						fixer->next = shadow_fixers;
+						shadow_fixers = fixer;
+						fixer->obj_id = tags.obj_id;
+						fixer->shadowed_id =
+						    oh->shadows_obj;
+						yaffs_trace(YAFFS_TRACE_SCAN,
+							" Shadow fixer: %d shadows %d",
+							fixer->obj_id,
+							fixer->shadowed_id);
+
+					}
+
+				}
+
+				if (in && in->valid) {
+					/* We have already filled this one.
+					 * We have a duplicate and need to
+					 * resolve it. */
+
+					unsigned existing_serial = in->serial;
+					unsigned new_serial =
+					    tags.serial_number;
+
+					if (((existing_serial + 1) & 3) ==
+					    new_serial) {
+						/* Use new one - destroy the
+						 * exisiting one */
+						yaffs_chunk_del(dev,
+								in->hdr_chunk,
+								1, __LINE__);
+						in->valid = 0;
+					} else {
+						/* Use existing - destroy
+						 * this one. */
+						yaffs_chunk_del(dev, chunk, 1,
+								__LINE__);
+					}
+				}
+
+				if (in && !in->valid &&
+				    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+				     tags.obj_id ==
+				     YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle
+					 * with directory structure */
+					in->valid = 1;
+					in->variant_type = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+					yaffs_load_attribs(in, oh);
+					in->hdr_chunk = chunk;
+					in->serial = tags.serial_number;
+
+				} else if (in && !in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->variant_type = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+					yaffs_load_attribs(in, oh);
+					in->hdr_chunk = chunk;
+					in->serial = tags.serial_number;
+
+					yaffs_set_obj_name_from_oh(in, oh);
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					parent =
+					    yaffs_find_or_create_by_number
+					    (dev, oh->parent_obj_id,
+					     YAFFS_OBJECT_TYPE_DIRECTORY);
+					if (!parent)
+						alloc_failed = 1;
+					if (parent && parent->variant_type ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variant_type =
+						    YAFFS_OBJECT_TYPE_DIRECTORY;
+						INIT_LIST_HEAD(&parent->
+							variant.dir_variant.
+							children);
+					} else if (!parent ||
+						parent->variant_type !=
+						YAFFS_OBJECT_TYPE_DIRECTORY) {
+						/* Hoosterman, a problem....
+						 * We're trying to use a
+						 * non-directory as a directory
+						 */
+
+						yaffs_trace(YAFFS_TRACE_ERROR,
+							"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+							);
+						parent = dev->lost_n_found;
+					}
+
+					yaffs_add_obj_to_dir(parent, in);
+
+					switch (in->variant_type) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+						if (dev->param.
+						    use_header_file_size)
+							in->variant.
+							file_variant.file_size
+							= yaffs_oh_to_size(oh);
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						in->variant.
+						    hardlink_variant.equiv_id =
+						    oh->equiv_id;
+						list_add(&in->hard_links,
+								&hard_list);
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:
+						in->variant.symlink_variant.
+						    alias =
+						    yaffs_clone_str(oh->alias);
+						if (!in->variant.
+						    symlink_variant.alias)
+							alloc_failed = 1;
+						break;
+					}
+				}
+			}
+		}
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* If we got this far while scanning,
+			 * then the block is fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			/* If the block was partially allocated then
+			 * treat it as fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
+
+		bi->block_state = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state == YAFFS_BLOCK_STATE_FULL)
+			yaffs_block_became_dirty(dev, blk);
+	}
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add
+	 * these hardlinks.
+	 */
+
+	yaffs_link_fixup(dev, &hard_list);
+
+	/*
+	 * Fix up any shadowed objects.
+	 * There should not be more than one of these.
+	 */
+	{
+		struct yaffs_shadow_fixer *fixer;
+		struct yaffs_obj *obj;
+
+		while (shadow_fixers) {
+			fixer = shadow_fixers;
+			shadow_fixers = fixer->next;
+			/* Complete the rename transaction by deleting the
+			 * shadowed object then setting the object header
+			 to unshadowed.
+			 */
+			obj = yaffs_find_by_number(dev, fixer->shadowed_id);
+			if (obj)
+				yaffs_del_obj(obj);
+
+			obj = yaffs_find_by_number(dev, fixer->obj_id);
+
+			if (obj)
+				yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+			kfree(fixer);
+		}
+	}
+
+	yaffs_release_temp_buffer(dev, chunk_data);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
+
+	return YAFFS_OK;
+}

flight/pios/common/libraries/yaffs2/yaffs_yaffs2.c

@@ -0,0 +1,1546 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+#include "yaffs_attribs.h"
+#include "yaffs_summary.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+
+/* yaffs_calc_oldest_dirty_seq()
+ * yaffs2_find_oldest_dirty_seq()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+	int i;
+	unsigned seq;
+	unsigned block_no = 0;
+	struct yaffs_block_info *b;
+
+	if (!dev->param.is_yaffs2)
+		return;
+
+	/* Find the oldest dirty sequence number. */
+	seq = dev->seq_number + 1;
+	b = dev->block_info;
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
+		    (b->pages_in_use - b->soft_del_pages) <
+		    dev->param.chunks_per_block &&
+		    b->seq_number < seq) {
+			seq = b->seq_number;
+			block_no = i;
+		}
+		b++;
+	}
+
+	if (block_no) {
+		dev->oldest_dirty_seq = seq;
+		dev->oldest_dirty_block = block_no;
+	}
+}
+
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!dev->oldest_dirty_seq)
+		yaffs_calc_oldest_dirty_seq(dev);
+}
+
+/*
+ * yaffs_clear_oldest_dirty_seq()
+ * Called when a block is erased or marked bad. (ie. when its seq_number
+ * becomes invalid). If the value matches the oldest then we clear
+ * dev->oldest_dirty_seq to force its recomputation.
+ */
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+				   struct yaffs_block_info *bi)
+{
+
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
+		dev->oldest_dirty_seq = 0;
+		dev->oldest_dirty_block = 0;
+	}
+}
+
+/*
+ * yaffs2_update_oldest_dirty_seq()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldest_dirty_seq is actually being tracked.
+ */
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+				    struct yaffs_block_info *bi)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (dev->oldest_dirty_seq) {
+		if (dev->oldest_dirty_seq > bi->seq_number) {
+			dev->oldest_dirty_seq = bi->seq_number;
+			dev->oldest_dirty_block = block_no;
+		}
+	}
+}
+
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
+{
+
+	if (!dev->param.is_yaffs2)
+		return 1;	/* disqualification only applies to yaffs2. */
+
+	if (!bi->has_shrink_hdr)
+		return 1;	/* can gc */
+
+	yaffs2_find_oldest_dirty_seq(dev);
+
+	/* Can't do gc of this block if there are any blocks older than this
+	 * one that have discarded pages.
+	 */
+	return (bi->seq_number <= dev->oldest_dirty_seq);
+}
+
+/*
+ * yaffs2_find_refresh_block()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev)
+{
+	u32 b;
+	u32 oldest = 0;
+	u32 oldest_seq = 0;
+	struct yaffs_block_info *bi;
+
+	if (!dev->param.is_yaffs2)
+		return oldest;
+
+	/*
+	 * If refresh period < 10 then refreshing is disabled.
+	 */
+	if (dev->param.refresh_period < 10)
+		return oldest;
+
+	/*
+	 * Fix broken values.
+	 */
+	if (dev->refresh_skip > dev->param.refresh_period)
+		dev->refresh_skip = dev->param.refresh_period;
+
+	if (dev->refresh_skip > 0)
+		return oldest;
+
+	/*
+	 * Refresh skip is now zero.
+	 * We'll do a refresh this time around....
+	 * Update the refresh skip and find the oldest block.
+	 */
+	dev->refresh_skip = dev->param.refresh_period;
+	dev->refresh_count++;
+	bi = dev->block_info;
+	for (b = dev->internal_start_block; b <= (u32)dev->internal_end_block; b++) {
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+
+			if (oldest < 1 || bi->seq_number < oldest_seq) {
+				oldest = b;
+				oldest_seq = bi->seq_number;
+			}
+		}
+		bi++;
+	}
+
+	if (oldest > 0) {
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC refresh count %d selected block %d with seq_number %d",
+			dev->refresh_count, oldest, oldest_seq);
+	}
+
+	return oldest;
+}
+
+int yaffs2_checkpt_required(struct yaffs_dev *dev)
+{
+	int nblocks;
+
+	if (!dev->param.is_yaffs2)
+		return 0;
+
+	nblocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+	return !dev->param.skip_checkpt_wr &&
+	    !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
+{
+	int retval;
+	int n_bytes = 0;
+	int n_blocks;
+	int dev_blocks;
+
+	if (!dev->param.is_yaffs2)
+		return 0;
+
+	if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
+		/* Not a valid value so recalculate */
+		dev_blocks = dev->param.end_block - dev->param.start_block + 1;
+		n_bytes += sizeof(struct yaffs_checkpt_validity);
+		n_bytes += sizeof(struct yaffs_checkpt_dev);
+		n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
+		n_bytes += dev_blocks * dev->chunk_bit_stride;
+		n_bytes +=
+		    (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) *
+		    dev->n_obj;
+		n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes;
+		n_bytes += sizeof(struct yaffs_checkpt_validity);
+		n_bytes += sizeof(u32);	/* checksum */
+
+		/* Round up and add 2 blocks to allow for some bad blocks,
+		 * so add 3 */
+
+		n_blocks =
+		    (n_bytes /
+		     (dev->data_bytes_per_chunk *
+		      dev->param.chunks_per_block)) + 3;
+
+		dev->checkpoint_blocks_required = n_blocks;
+	}
+
+	retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
+	if (retval < 0)
+		retval = 0;
+	return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+	struct yaffs_checkpt_validity cp;
+
+	memset(&cp, 0, sizeof(cp));
+
+	cp.struct_type = sizeof(cp);
+	cp.magic = YAFFS_MAGIC;
+	cp.version = YAFFS_CHECKPOINT_VERSION;
+	cp.head = (head) ? 1 : 0;
+
+	return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+	struct yaffs_checkpt_validity cp;
+	int ok;
+
+	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == (int)sizeof(cp));
+
+	if (ok)
+		ok = (cp.struct_type == sizeof(cp)) &&
+		    (cp.magic == YAFFS_MAGIC) &&
+		    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+		    (cp.head == ((head) ? 1 : 0));
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
+				      struct yaffs_dev *dev)
+{
+	cp->n_erased_blocks = dev->n_erased_blocks;
+	cp->alloc_block = dev->alloc_block;
+	cp->alloc_page = dev->alloc_page;
+	cp->n_free_chunks = dev->n_free_chunks;
+
+	cp->n_deleted_files = dev->n_deleted_files;
+	cp->n_unlinked_files = dev->n_unlinked_files;
+	cp->n_bg_deletions = dev->n_bg_deletions;
+	cp->seq_number = dev->seq_number;
+
+}
+
+static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
+				     struct yaffs_checkpt_dev *cp)
+{
+	dev->n_erased_blocks = cp->n_erased_blocks;
+	dev->alloc_block = cp->alloc_block;
+	dev->alloc_page = cp->alloc_page;
+	dev->n_free_chunks = cp->n_free_chunks;
+
+	dev->n_deleted_files = cp->n_deleted_files;
+	dev->n_unlinked_files = cp->n_unlinked_files;
+	dev->n_bg_deletions = cp->n_bg_deletions;
+	dev->seq_number = cp->seq_number;
+}
+
+static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_dev cp;
+	u32 n_bytes;
+	u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+	int ok;
+
+	/* Write device runtime values */
+	yaffs2_dev_to_checkpt_dev(&cp, dev);
+	cp.struct_type = sizeof(cp);
+
+	ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (!ok)
+		return 0;
+
+	/* Write block info */
+	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+	ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == (int)n_bytes);
+	if (!ok)
+		return 0;
+
+	/* Write chunk bits */
+	n_bytes = n_blocks * dev->chunk_bit_stride;
+	ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == (int)n_bytes);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_dev cp;
+	u32 n_bytes;
+	u32 n_blocks =
+	    (dev->internal_end_block - dev->internal_start_block + 1);
+	int ok;
+
+	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == (int)sizeof(cp));
+	if (!ok)
+		return 0;
+
+	if (cp.struct_type != sizeof(cp))
+		return 0;
+
+	yaffs_checkpt_dev_to_dev(dev, &cp);
+
+	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+
+	ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == (int)n_bytes);
+
+	if (!ok)
+		return 0;
+
+	n_bytes = n_blocks * dev->chunk_bit_stride;
+
+	ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == (int)n_bytes);
+
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
+				   struct yaffs_obj *obj)
+{
+	cp->obj_id = obj->obj_id;
+	cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
+	cp->hdr_chunk = obj->hdr_chunk;
+	cp->variant_type = obj->variant_type;
+	cp->deleted = obj->deleted;
+	cp->soft_del = obj->soft_del;
+	cp->unlinked = obj->unlinked;
+	cp->fake = obj->fake;
+	cp->rename_allowed = obj->rename_allowed;
+	cp->unlink_allowed = obj->unlink_allowed;
+	cp->serial = obj->serial;
+	cp->n_data_chunks = obj->n_data_chunks;
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
+	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+		cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
+}
+
+static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
+				     struct yaffs_checkpt_obj *cp)
+{
+	struct yaffs_obj *parent;
+
+	if (obj->variant_type != cp->variant_type) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Checkpoint read object %d type %d chunk %d does not match existing object type %d",
+			cp->obj_id, cp->variant_type, cp->hdr_chunk,
+			obj->variant_type);
+		return 0;
+	}
+
+	obj->obj_id = cp->obj_id;
+
+	if (cp->parent_id)
+		parent = yaffs_find_or_create_by_number(obj->my_dev,
+						cp->parent_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+	else
+		parent = NULL;
+
+	if (parent) {
+		if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
+				cp->obj_id, cp->parent_id,
+				cp->variant_type, cp->hdr_chunk,
+				parent->variant_type);
+			return 0;
+		}
+		yaffs_add_obj_to_dir(parent, obj);
+	}
+
+	obj->hdr_chunk = cp->hdr_chunk;
+	obj->variant_type = cp->variant_type;
+	obj->deleted = cp->deleted;
+	obj->soft_del = cp->soft_del;
+	obj->unlinked = cp->unlinked;
+	obj->fake = cp->fake;
+	obj->rename_allowed = cp->rename_allowed;
+	obj->unlink_allowed = cp->unlink_allowed;
+	obj->serial = cp->serial;
+	obj->n_data_chunks = cp->n_data_chunks;
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
+	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+		obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
+
+	if (obj->hdr_chunk > 0)
+		obj->lazy_loaded = 1;
+	return 1;
+}
+
+static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
+				       struct yaffs_tnode *tn, u32 level,
+				       int chunk_offset)
+{
+	int i;
+	struct yaffs_dev *dev = in->my_dev;
+	int ok = 1;
+	u32 base_offset;
+
+	if (!tn)
+		return 1;
+
+	if (level > 0) {
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+			if (!tn->internal[i])
+				continue;
+			ok = yaffs2_checkpt_tnode_worker(in,
+				 tn->internal[i],
+				 level - 1,
+				 (chunk_offset <<
+				  YAFFS_TNODES_INTERNAL_BITS) + i);
+		}
+		return ok;
+	}
+
+	/* Level 0 tnode */
+	base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
+	ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
+			sizeof(base_offset));
+	if (ok)
+		ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
+			(int)dev->tnode_size);
+
+	return ok;
+}
+
+static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
+{
+	u32 end_marker = ~0;
+	int ok = 1;
+
+	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return ok;
+
+	ok = yaffs2_checkpt_tnode_worker(obj,
+					 obj->variant.file_variant.top,
+					 obj->variant.file_variant.
+					 top_level, 0);
+	if (ok)
+		ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker,
+				sizeof(end_marker)) == sizeof(end_marker));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
+{
+	u32 base_chunk;
+	int ok = 1;
+	struct yaffs_dev *dev = obj->my_dev;
+	struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
+	struct yaffs_tnode *tn;
+	int nread = 0;
+
+	ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
+	      (int)sizeof(base_chunk));
+
+	while (ok && (~base_chunk)) {
+		nread++;
+		/* Read level 0 tnode */
+
+		tn = yaffs_get_tnode(dev);
+		if (tn)
+			ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
+				(int)dev->tnode_size);
+		else
+			ok = 0;
+
+		if (tn && ok)
+			ok = yaffs_add_find_tnode_0(dev,
+						    file_stuct_ptr,
+						    base_chunk, tn) ? 1 : 0;
+
+		if (ok)
+			ok = (yaffs2_checkpt_rd
+			      (dev, &base_chunk,
+			       sizeof(base_chunk)) == (int)sizeof(base_chunk));
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"Checkpoint read tnodes %d records, last %d. ok %d",
+		nread, base_chunk, ok);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_checkpt_obj cp;
+	int i;
+	int ok = 1;
+	struct list_head *lh;
+
+	/* Iterate through the objects in each hash entry,
+	 * dumping them to the checkpointing stream.
+	 */
+
+	for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each(lh, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			if (!obj->defered_free) {
+				yaffs2_obj_checkpt_obj(&cp, obj);
+				cp.struct_type = sizeof(cp);
+
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+					"Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
+					cp.obj_id, cp.parent_id,
+					cp.variant_type, cp.hdr_chunk, obj);
+
+				ok = (yaffs2_checkpt_wr(dev, &cp,
+						sizeof(cp)) == sizeof(cp));
+
+				if (ok &&
+					obj->variant_type ==
+					YAFFS_OBJECT_TYPE_FILE)
+					ok = yaffs2_wr_checkpt_tnodes(obj);
+			}
+		}
+	}
+
+	/* Dump end of list */
+	memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj));
+	cp.struct_type = sizeof(cp);
+
+	if (ok)
+		ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_checkpt_obj cp;
+	int ok = 1;
+	int done = 0;
+	LIST_HEAD(hard_list);
+
+
+	while (ok && !done) {
+		ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == (int)sizeof(cp));
+		if (cp.struct_type != sizeof(cp)) {
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"struct size %d instead of %d ok %d",
+				cp.struct_type, (int)sizeof(cp), ok);
+			ok = 0;
+		}
+
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"Checkpoint read object %d parent %d type %d chunk %d ",
+			cp.obj_id, cp.parent_id, cp.variant_type,
+			cp.hdr_chunk);
+
+		if (ok && cp.obj_id == (u32)~0) {
+			done = 1;
+		} else if (ok) {
+			obj =
+			    yaffs_find_or_create_by_number(dev, cp.obj_id,
+							   cp.variant_type);
+			if (obj) {
+				ok = yaffs2_checkpt_obj_to_obj(obj, &cp);
+				if (!ok)
+					break;
+				if (obj->variant_type ==
+					YAFFS_OBJECT_TYPE_FILE) {
+					ok = yaffs2_rd_checkpt_tnodes(obj);
+				} else if (obj->variant_type ==
+					YAFFS_OBJECT_TYPE_HARDLINK) {
+					list_add(&obj->hard_links, &hard_list);
+				}
+			} else {
+				ok = 0;
+			}
+		}
+	}
+
+	if (ok)
+		yaffs_link_fixup(dev, &hard_list);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
+{
+	u32 checkpt_sum;
+	int ok;
+
+	yaffs2_get_checkpt_sum(dev, &checkpt_sum);
+
+	ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
+		sizeof(checkpt_sum));
+
+	if (!ok)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
+{
+	u32 checkpt_sum0;
+	u32 checkpt_sum1;
+	int ok;
+
+	yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
+
+	ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
+		(int)sizeof(checkpt_sum1));
+
+	if (!ok)
+		return 0;
+
+	if (checkpt_sum0 != checkpt_sum1)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
+{
+	int ok = 1;
+
+	if (!yaffs2_checkpt_required(dev)) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"skipping checkpoint write");
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_checkpt_open(dev, 1);
+
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint validity");
+		ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint device");
+		ok = yaffs2_wr_checkpt_dev(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint objects");
+		ok = yaffs2_wr_checkpt_objs(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint validity");
+		ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
+	}
+
+	if (ok)
+		ok = yaffs2_wr_checkpt_sum(dev);
+
+	if (!yaffs_checkpt_close(dev))
+		ok = 0;
+
+	if (ok)
+		dev->is_checkpointed = 1;
+	else
+		dev->is_checkpointed = 0;
+
+	return dev->is_checkpointed;
+}
+
+static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
+{
+	int ok = 1;
+
+	if (!dev->param.is_yaffs2)
+		ok = 0;
+
+	if (ok && dev->param.skip_checkpt_rd) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"skipping checkpoint read");
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_checkpt_open(dev, 0); /* open for read */
+
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint validity");
+		ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint device");
+		ok = yaffs2_rd_checkpt_dev(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint objects");
+		ok = yaffs2_rd_checkpt_objs(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint validity");
+		ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
+	}
+
+	if (ok) {
+		ok = yaffs2_rd_checkpt_sum(dev);
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint checksum %d", ok);
+	}
+
+	if (!yaffs_checkpt_close(dev))
+		ok = 0;
+
+	if (ok)
+		dev->is_checkpointed = 1;
+	else
+		dev->is_checkpointed = 0;
+
+	return ok ? 1 : 0;
+}
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
+{
+	if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
+		dev->is_checkpointed = 0;
+		yaffs2_checkpt_invalidate_stream(dev);
+	}
+	if (dev->param.sb_dirty_fn)
+		dev->param.sb_dirty_fn(dev);
+}
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev)
+{
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"save entry: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	yaffs_verify_objects(dev);
+	yaffs_verify_blocks(dev);
+	yaffs_verify_free_chunks(dev);
+
+	if (!dev->is_checkpointed) {
+		yaffs2_checkpt_invalidate(dev);
+		yaffs2_wr_checkpt_data(dev);
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
+		"save exit: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	return dev->is_checkpointed;
+}
+
+int yaffs2_checkpt_restore(struct yaffs_dev *dev)
+{
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"restore entry: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	retval = yaffs2_rd_checkpt_data(dev);
+
+	if (dev->is_checkpointed) {
+		yaffs_verify_objects(dev);
+		yaffs_verify_blocks(dev);
+		yaffs_verify_free_chunks(dev);
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"restore exit: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	return retval;
+}
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, Y_LOFF_T new_size)
+{
+	/* if new_size > old_file_size.
+	 * We're going to be writing a hole.
+	 * If the hole is small then write zeros otherwise write a start
+	 * of hole marker.
+	 */
+	Y_LOFF_T old_file_size;
+	Y_LOFF_T increase;
+	int small_hole;
+	int result = YAFFS_OK;
+	struct yaffs_dev *dev = NULL;
+	u8 *local_buffer = NULL;
+	int small_increase_ok = 0;
+
+	if (!obj)
+		return YAFFS_FAIL;
+
+	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	dev = obj->my_dev;
+
+	/* Bail out if not yaffs2 mode */
+	if (!dev->param.is_yaffs2)
+		return YAFFS_OK;
+
+	old_file_size = obj->variant.file_variant.file_size;
+
+	if (new_size <= old_file_size)
+		return YAFFS_OK;
+
+	increase = new_size - old_file_size;
+
+	if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
+	    yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+		small_hole = 1;
+	else
+		small_hole = 0;
+
+	if (small_hole)
+		local_buffer = yaffs_get_temp_buffer(dev);
+
+	if (local_buffer) {
+		/* fill hole with zero bytes */
+		Y_LOFF_T pos = old_file_size;
+		int this_write;
+		int written;
+		memset(local_buffer, 0, dev->data_bytes_per_chunk);
+		small_increase_ok = 1;
+
+		while (increase > 0 && small_increase_ok) {
+			this_write = increase;
+			if (this_write > dev->data_bytes_per_chunk)
+				this_write = dev->data_bytes_per_chunk;
+			written =
+			    yaffs_do_file_wr(obj, local_buffer, pos, this_write,
+					     0);
+			if (written == this_write) {
+				pos += this_write;
+				increase -= this_write;
+			} else {
+				small_increase_ok = 0;
+			}
+		}
+
+		yaffs_release_temp_buffer(dev, local_buffer);
+
+		/* If out of space then reverse any chunks we've added */
+		if (!small_increase_ok)
+			yaffs_resize_file_down(obj, old_file_size);
+	}
+
+	if (!small_increase_ok &&
+	    obj->parent &&
+	    obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+	    obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
+		/* Write a hole start header with the old file size */
+		yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
+	}
+
+	return result;
+}
+
+struct yaffs_block_index {
+	int seq;
+	int block;
+};
+
+static int yaffs2_ybicmp(const void *a, const void *b)
+{
+	int aseq = ((struct yaffs_block_index *)a)->seq;
+	int bseq = ((struct yaffs_block_index *)b)->seq;
+	int ablock = ((struct yaffs_block_index *)a)->block;
+	int bblock = ((struct yaffs_block_index *)b)->block;
+
+	if (aseq == bseq)
+		return ablock - bblock;
+
+	return aseq - bseq;
+}
+
+static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
+		struct yaffs_block_info *bi,
+		int blk, int chunk_in_block,
+		int *found_chunks,
+		u8 *chunk_data,
+		struct list_head *hard_list,
+		int summary_available)
+{
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_obj *in;
+	struct yaffs_obj *parent;
+	int equiv_id;
+	Y_LOFF_T file_size;
+	int is_shrink;
+	int is_unlinked;
+	struct yaffs_ext_tags tags;
+	//int result;
+	int alloc_failed = 0;
+	int chunk = blk * dev->param.chunks_per_block + chunk_in_block;
+	struct yaffs_file_var *file_var;
+	struct yaffs_hardlink_var *hl_var;
+	struct yaffs_symlink_var *sl_var;
+
+	if (summary_available) {
+		if (!yaffs_summary_fetch(dev, &tags, chunk_in_block))
+		
+		{
+		    yaffs_trace(YAFFS_TRACE_ERROR, "yaffs2_scan_chunk: unhandled error from yaffs_summary_fetch");
+		}
+		tags.seq_number = bi->seq_number;
+	}
+
+	if (!summary_available || tags.obj_id == 0) {
+		if (!yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags))
+
+		{
+		    yaffs_trace(YAFFS_TRACE_ERROR, "yaffs2_scan_chunk: unhandled error from rd_chunk_tags_nand");
+		}
+		dev->tags_used++;
+	} else {
+		dev->summary_used++;
+	}
+
+	/* Let's have a good look at this chunk... */
+
+	if (!tags.chunk_used) {
+		/* An unassigned chunk in the block.
+		 * If there are used chunks after this one, then
+		 * it is a chunk that was skipped due to failing
+		 * the erased check. Just skip it so that it can
+		 * be deleted.
+		 * But, more typically, We get here when this is
+		 * an unallocated chunk and his means that
+		 * either the block is empty or this is the one
+		 * being allocated from
+		 */
+
+		if (*found_chunks) {
+			/* This is a chunk that was skipped due
+			 * to failing the erased check */
+		} else if (chunk_in_block == 0) {
+			/* We're looking at the first chunk in
+			 * the block so the block is unused */
+			bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+			dev->n_erased_blocks++;
+		} else {
+			if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+			    bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+				if (dev->seq_number == bi->seq_number) {
+					/* Allocating from this block*/
+					yaffs_trace(YAFFS_TRACE_SCAN,
+					    " Allocating from %d %d",
+					    blk, chunk_in_block);
+
+					bi->block_state =
+						YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->alloc_block = blk;
+					dev->alloc_page = chunk_in_block;
+					dev->alloc_block_finder = blk;
+				} else {
+					/* This is a partially written block
+					 * that is not the current
+					 * allocation block.
+					 */
+					yaffs_trace(YAFFS_TRACE_SCAN,
+						"Partially written block %d detected. gc will fix this.",
+						blk);
+				}
+			}
+		}
+
+		dev->n_free_chunks++;
+
+	} else if (tags.ecc_result ==
+		YAFFS_ECC_RESULT_UNFIXED) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			" Unfixed ECC in chunk(%d:%d), chunk ignored",
+			blk, chunk_in_block);
+			dev->n_free_chunks++;
+	} else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
+		   tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
+		   tags.obj_id == YAFFS_OBJECTID_SUMMARY ||
+		   (tags.chunk_id > 0 &&
+		     tags.n_bytes > (u32)dev->data_bytes_per_chunk) ||
+		   tags.seq_number != bi->seq_number) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored",
+			blk, chunk_in_block, tags.obj_id,
+			tags.chunk_id, tags.n_bytes);
+		dev->n_free_chunks++;
+	} else if (tags.chunk_id > 0) {
+		/* chunk_id > 0 so it is a data chunk... */
+		Y_LOFF_T endpos;
+		Y_LOFF_T chunk_base = (tags.chunk_id - 1) *
+					dev->data_bytes_per_chunk;
+
+		*found_chunks = 1;
+
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+
+		in = yaffs_find_or_create_by_number(dev,
+					tags.obj_id,
+					YAFFS_OBJECT_TYPE_FILE);
+		if (!in)
+			/* Out of memory */
+			alloc_failed = 1;
+
+		if (in &&
+		    in->variant_type == YAFFS_OBJECT_TYPE_FILE &&
+		    chunk_base < in->variant.file_variant.shrink_size) {
+			/* This has not been invalidated by
+			 * a resize */
+			if (!yaffs_put_chunk_in_file(in, tags.chunk_id,
+								chunk, -1))
+				alloc_failed = 1;
+
+			/* File size is calculated by looking at
+			 * the data chunks if we have not
+			 * seen an object header yet.
+			 * Stop this practice once we find an
+			 * object header.
+			 */
+			endpos = chunk_base + tags.n_bytes;
+
+			if (!in->valid &&
+			    in->variant.file_variant.scanned_size < endpos) {
+				in->variant.file_variant.
+				    scanned_size = endpos;
+				in->variant.file_variant.
+				    file_size = endpos;
+			}
+		} else if (in) {
+			/* This chunk has been invalidated by a
+			 * resize, or a past file deletion
+			 * so delete the chunk*/
+			yaffs_chunk_del(dev, chunk, 1, __LINE__);
+		}
+	} else {
+		/* chunk_id == 0, so it is an ObjectHeader.
+		 * Thus, we read in the object header and make
+		 * the object
+		 */
+		*found_chunks = 1;
+
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+
+		oh = NULL;
+		in = NULL;
+
+		if (tags.extra_available) {
+			in = yaffs_find_or_create_by_number(dev,
+					tags.obj_id,
+					tags.extra_obj_type);
+			if (!in)
+				alloc_failed = 1;
+		}
+
+		if (!in ||
+		    (!in->valid && dev->param.disable_lazy_load) ||
+		    tags.extra_shadows ||
+		    (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+				 tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND))) {
+
+			/* If we don't have  valid info then we
+			 * need to read the chunk
+			 * TODO In future we can probably defer
+			 * reading the chunk and living with
+			 * invalid data until needed.
+			 */
+
+			if (!yaffs_rd_chunk_tags_nand(dev,
+						  chunk,
+						  chunk_data,
+						  NULL))
+		
+			{
+			    yaffs_trace(YAFFS_TRACE_ERROR, "yaffs2_scan_chunk: unhandled error from rd_chunk_tags_nand");
+			}
+
+			oh = (struct yaffs_obj_hdr *)chunk_data;
+
+			if (dev->param.inband_tags) {
+				/* Fix up the header if they got
+				 * corrupted by inband tags */
+				oh->shadows_obj =
+				    oh->inband_shadowed_obj_id;
+				oh->is_shrink =
+				    oh->inband_is_shrink;
+			}
+
+			if (!in) {
+				in = yaffs_find_or_create_by_number(dev,
+							tags.obj_id, oh->type);
+				if (!in)
+					alloc_failed = 1;
+			}
+		}
+
+		if (!in) {
+			/* TODO Hoosterman we have a problem! */
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy: Could not make object for object  %d at chunk %d during scan",
+				tags.obj_id, chunk);
+			return YAFFS_FAIL;
+		}
+
+		if (in->valid) {
+			/* We have already filled this one.
+			 * We have a duplicate that will be
+			 * discarded, but we first have to suck
+			 * out resize info if it is a file.
+			 */
+			if ((in->variant_type == YAFFS_OBJECT_TYPE_FILE) &&
+				((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
+				 (tags.extra_available &&
+				  tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+				)) {
+				Y_LOFF_T this_size = (oh) ?
+					yaffs_oh_to_size(oh) :
+					tags.extra_file_size;
+				u32 parent_obj_id = (oh) ?
+					(u32)oh->parent_obj_id :
+					tags.extra_parent_id;
+
+				is_shrink = (oh) ?
+					oh->is_shrink :
+					tags.extra_is_shrink;
+
+				/* If it is deleted (unlinked
+				 * at start also means deleted)
+				 * we treat the file size as
+				 * being zeroed at this point.
+				 */
+				if (parent_obj_id == YAFFS_OBJECTID_DELETED ||
+				    parent_obj_id == YAFFS_OBJECTID_UNLINKED) {
+					this_size = 0;
+					is_shrink = 1;
+				}
+
+				if (is_shrink &&
+				    in->variant.file_variant.shrink_size >
+				    this_size)
+					in->variant.file_variant.shrink_size =
+					this_size;
+
+				if (is_shrink)
+					bi->has_shrink_hdr = 1;
+			}
+			/* Use existing - destroy this one. */
+			yaffs_chunk_del(dev, chunk, 1, __LINE__);
+		}
+
+		if (!in->valid && in->variant_type !=
+		    (oh ? oh->type : tags.extra_obj_type)) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy: Bad type, %d != %d, for object %d at chunk %d during scan",
+				oh ? oh->type : tags.extra_obj_type,
+				in->variant_type, tags.obj_id,
+				chunk);
+			in = yaffs_retype_obj(in, oh ? oh->type : tags.extra_obj_type);
+		}
+
+		if (!in->valid &&
+		    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+		     tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) {
+			/* We only load some info, don't fiddle
+			 * with directory structure */
+			in->valid = 1;
+
+			if (oh) {
+				in->yst_mode = oh->yst_mode;
+				yaffs_load_attribs(in, oh);
+				in->lazy_loaded = 0;
+			} else {
+				in->lazy_loaded = 1;
+			}
+			in->hdr_chunk = chunk;
+
+		} else if (!in->valid) {
+			/* we need to load this info */
+			in->valid = 1;
+			in->hdr_chunk = chunk;
+			if (oh) {
+				in->variant_type = oh->type;
+				in->yst_mode = oh->yst_mode;
+				yaffs_load_attribs(in, oh);
+
+				if (oh->shadows_obj > 0)
+					yaffs_handle_shadowed_obj(dev,
+					     oh->shadows_obj, 1);
+
+				yaffs_set_obj_name_from_oh(in, oh);
+				parent = yaffs_find_or_create_by_number(dev,
+						oh->parent_obj_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+				file_size = yaffs_oh_to_size(oh);
+				is_shrink = oh->is_shrink;
+				equiv_id = oh->equiv_id;
+			} else {
+				in->variant_type = tags.extra_obj_type;
+				parent = yaffs_find_or_create_by_number(dev,
+						tags.extra_parent_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+				file_size = tags.extra_file_size;
+				is_shrink = tags.extra_is_shrink;
+				equiv_id = tags.extra_equiv_id;
+				in->lazy_loaded = 1;
+			}
+			in->dirty = 0;
+
+			if (!parent)
+				alloc_failed = 1;
+
+			/* directory stuff...
+			 * hook up to parent
+			 */
+
+			if (parent &&
+			    parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) {
+				/* Set up as a directory */
+				parent->variant_type =
+					YAFFS_OBJECT_TYPE_DIRECTORY;
+				INIT_LIST_HEAD(&parent->
+						variant.dir_variant.children);
+			} else if (!parent ||
+				   parent->variant_type !=
+					YAFFS_OBJECT_TYPE_DIRECTORY) {
+				/* Hoosterman, another problem....
+				 * Trying to use a non-directory as a directory
+				 */
+
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+					);
+				parent = dev->lost_n_found;
+			}
+			yaffs_add_obj_to_dir(parent, in);
+
+			is_unlinked = (parent == dev->del_dir) ||
+					(parent == dev->unlinked_dir);
+
+			if (is_shrink)
+				/* Mark the block */
+				bi->has_shrink_hdr = 1;
+
+			/* Note re hardlinks.
+			 * Since we might scan a hardlink before its equivalent
+			 * object is scanned we put them all in a list.
+			 * After scanning is complete, we should have all the
+			 * objects, so we run through this list and fix up all
+			 * the chains.
+			 */
+
+			switch (in->variant_type) {
+			case YAFFS_OBJECT_TYPE_UNKNOWN:
+				/* Todo got a problem */
+				break;
+			case YAFFS_OBJECT_TYPE_FILE:
+				file_var = &in->variant.file_variant;
+				if (file_var->scanned_size < file_size) {
+					/* This covers the case where the file
+					 * size is greater than the data held.
+					 * This will happen if the file is
+					 * resized to be larger than its
+					 * current data extents.
+					 */
+					file_var->file_size = file_size;
+					file_var->scanned_size = file_size;
+				}
+
+				if (file_var->shrink_size > file_size)
+					file_var->shrink_size = file_size;
+
+				break;
+			case YAFFS_OBJECT_TYPE_HARDLINK:
+				hl_var = &in->variant.hardlink_variant;
+				if (!is_unlinked) {
+					hl_var->equiv_id = equiv_id;
+					list_add(&in->hard_links, hard_list);
+				}
+				break;
+			case YAFFS_OBJECT_TYPE_DIRECTORY:
+				/* Do nothing */
+				break;
+			case YAFFS_OBJECT_TYPE_SPECIAL:
+				/* Do nothing */
+				break;
+			case YAFFS_OBJECT_TYPE_SYMLINK:
+				sl_var = &in->variant.symlink_variant;
+				if (oh) {
+					sl_var->alias =
+					    yaffs_clone_str(oh->alias);
+					if (!sl_var->alias)
+						alloc_failed = 1;
+				}
+				break;
+			}
+		}
+	}
+	return alloc_failed ? YAFFS_FAIL : YAFFS_OK;
+}
+
+int yaffs2_scan_backwards(struct yaffs_dev *dev)
+{
+	int blk;
+	int block_iter;
+	int start_iter;
+	int end_iter;
+	int n_to_scan = 0;
+	enum yaffs_block_state state;
+	int c;
+	//int deleted;
+	LIST_HEAD(hard_list);
+	struct yaffs_block_info *bi;
+	u32 seq_number;
+	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+	u8 *chunk_data;
+	int found_chunks;
+	int alloc_failed = 0;
+	struct yaffs_block_index *block_index = NULL;
+	int alt_block_index = 0;
+	int summary_available;
+
+	yaffs_trace(YAFFS_TRACE_SCAN,
+		"yaffs2_scan_backwards starts  intstartblk %d intendblk %d...",
+		dev->internal_start_block, dev->internal_end_block);
+
+	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	block_index =
+		kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS);
+
+	if (!block_index) {
+		block_index =
+		    vmalloc(n_blocks * sizeof(struct yaffs_block_index));
+		alt_block_index = 1;
+	}
+
+	if (!block_index) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"yaffs2_scan_backwards() could not allocate block index!"
+			);
+		return YAFFS_FAIL;
+	}
+
+	dev->blocks_in_checkpt = 0;
+
+	chunk_data = yaffs_get_temp_buffer(dev);
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->block_info;
+	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+	     blk++) {
+		yaffs_clear_chunk_bits(dev, blk);
+		bi->pages_in_use = 0;
+		bi->soft_del_pages = 0;
+
+		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+		bi->block_state = state;
+		bi->seq_number = seq_number;
+
+		if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+			bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+
+		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+			"Block scanning block %d state %d seq %d",
+			blk, bi->block_state, seq_number);
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			dev->blocks_in_checkpt++;
+
+		} else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) {
+			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+				"block %d is bad", blk);
+		} else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+			dev->n_erased_blocks++;
+			dev->n_free_chunks += dev->param.chunks_per_block;
+		} else if (bi->block_state ==
+				YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* Determine the highest sequence number */
+			if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+				block_index[n_to_scan].seq = seq_number;
+				block_index[n_to_scan].block = blk;
+				n_to_scan++;
+				if (seq_number >= dev->seq_number)
+					dev->seq_number = seq_number;
+			} else {
+				/* TODO: Nasty sequence number! */
+				yaffs_trace(YAFFS_TRACE_SCAN,
+					"Block scanning block %d has bad sequence number %d",
+					blk, seq_number);
+			}
+		}
+		bi++;
+	}
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS, "%d blocks to be sorted...", n_to_scan);
+
+	cond_resched();
+
+	/* Sort the blocks by sequence number */
+	sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
+		   yaffs2_ybicmp, NULL);
+
+	cond_resched();
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "...done");
+
+	/* Now scan the blocks looking at the data. */
+	start_iter = 0;
+	end_iter = n_to_scan - 1;
+	yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan);
+
+	/* For each block.... backwards */
+	for (block_iter = end_iter;
+	     !alloc_failed && block_iter >= start_iter;
+	     block_iter--) {
+		/* Cooperative multitasking! This loop can run for so
+		   long that watchdog timers expire. */
+		cond_resched();
+
+		/* get the block to scan in the correct order */
+		blk = block_index[block_iter].block;
+		bi = yaffs_get_block_info(dev, blk);
+		//deleted = 0;
+
+		summary_available = yaffs_summary_read(dev, dev->sum_tags, blk);
+
+		/* For each chunk in each block that needs scanning.... */
+		found_chunks = 0;
+		if (summary_available)
+			c = dev->chunks_per_summary - 1;
+		else
+			c = dev->param.chunks_per_block - 1;
+
+		for (/* c is already initialised */;
+		     !alloc_failed && c >= 0 &&
+		     (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+		      bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING);
+		      c--) {
+			/* Scan backwards...
+			 * Read the tags and decide what to do
+			 */
+			if (yaffs2_scan_chunk(dev, bi, blk, c,
+					&found_chunks, chunk_data,
+					&hard_list, summary_available) ==
+					YAFFS_FAIL)
+				alloc_failed = 1;
+		}
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* If we got this far while scanning, then the block
+			 * is fully allocated. */
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		/* Now let's see if it was dirty */
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_block_became_dirty(dev, blk);
+		}
+	}
+
+	yaffs_skip_rest_of_block(dev);
+
+	if (alt_block_index)
+		vfree(block_index);
+	else
+		kfree(block_index);
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We have scanned all the objects, now it's time to add these
+	 * hardlinks.
+	 */
+	yaffs_link_fixup(dev, &hard_list);
+
+	yaffs_release_temp_buffer(dev, chunk_data);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends");
+
+	return YAFFS_OK;
+}

flight/pios/common/libraries/yaffs2/yaffsfs.c

@@ -0,0 +1,3867 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffsfs.h"
+#include "yaffs_guts.h"
+#include "yaffscfg.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "string.h"
+
+#define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
+
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+
+#define ROOT_DIR(dev) (((dev) && (dev)->is_mounted) ? (dev)->root_dir : NULL)
+
+/* YAFFSFS_RW_SIZE must be a power of 2 */
+#define YAFFSFS_RW_SHIFT (13)
+#define YAFFSFS_RW_SIZE  (1<<YAFFSFS_RW_SHIFT)
+
+/* Some forward references */
+static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory,
+					    const YCHAR *path,
+					    int symDepth, int getEquiv,
+					    struct yaffs_obj **dirOut,
+					    int *notDir, int *loop);
+
+static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
+static yaffs_DIR *yaffsfs_opendir_reldir_no_lock(
+				struct yaffs_obj *reldir, const YCHAR *dirname);
+static int yaffsfs_closedir_no_lock(yaffs_DIR *dirent);
+
+unsigned int yaffs_wr_attempts;
+
+/*
+ * Handle management.
+ * There are open inodes in struct yaffsfs_Inode.
+ * There are open file descriptors in yaffsfs_FileDes.
+ * There are open handles in yaffsfs_FileDes.
+ *
+ * Things are structured this way to be like the Linux VFS model
+ * so that interactions with the yaffs guts calls are similar.
+ * That means more common code paths and less special code.
+ * That means better testing etc.
+ *
+ * We have 3 layers because:
+ * A handle is different than an fd because you can use dup()
+ * to create a new handle that accesses the *same* fd. The two
+ * handles will use the same offset (part of the fd). We only close
+ * down the fd when there are no more handles accessing it.
+ *
+ * More than one fd can currently access one file, but each fd
+ * has its own permsiions and offset.
+ */
+
+struct yaffsfs_Inode {
+	int count;		/* Number of handles accessing this inode */
+	struct yaffs_obj *iObj;
+};
+
+
+struct yaffsfs_DirSearchContext {
+	struct yaffs_dirent de;	/* directory entry */
+	YCHAR name[NAME_MAX + 1];	/* name of directory being searched */
+	struct yaffs_obj *dirObj;	/* ptr to directory being searched */
+	struct yaffs_obj *nextReturn;	/* obj  returned by next readddir */
+	struct list_head others;
+	s32 offset:20;
+	u8 inUse:1;
+};
+
+struct yaffsfs_FileDes {
+	u8 isDir:1; 		/* This s a directory */
+	u8 reading:1;
+	u8 writing:1;
+	u8 append:1;
+	u8 shareRead:1;
+	u8 shareWrite:1;
+	s32 inodeId:12;		/* Index to corresponding yaffsfs_Inode */
+	s32 handleCount:10;	/* Number of handles for this fd */
+	union {
+		Y_LOFF_T position;	/* current position in file */
+		yaffs_DIR *dir;
+	} v;
+};
+
+struct yaffsfs_Handle {
+	short int fdId;
+	short int useCount;
+};
+
+
+static struct yaffsfs_DirSearchContext yaffsfs_dsc[YAFFSFS_N_DSC];
+static struct yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
+static struct yaffsfs_FileDes yaffsfs_fd[YAFFSFS_N_HANDLES];
+static struct yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
+
+static int yaffsfs_handlesInitialised;
+
+unsigned yaffs_set_trace(unsigned tm)
+{
+	yaffs_trace_mask = tm;
+	return yaffs_trace_mask;
+}
+
+unsigned yaffs_get_trace(void)
+{
+	return yaffs_trace_mask;
+}
+
+/*
+ * yaffsfs_InitHandle
+ * Inilitalise handle management on start-up.
+ */
+
+static void yaffsfs_InitHandles(void)
+{
+	int i;
+
+	if (yaffsfs_handlesInitialised)
+		return;
+
+	yaffsfs_handlesInitialised = 1;
+
+	memset(yaffsfs_inode, 0, sizeof(yaffsfs_inode));
+	memset(yaffsfs_fd, 0, sizeof(yaffsfs_fd));
+	memset(yaffsfs_handle, 0, sizeof(yaffsfs_handle));
+	memset(yaffsfs_dsc, 0, sizeof(yaffsfs_dsc));
+
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++)
+		yaffsfs_fd[i].inodeId = -1;
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++)
+		yaffsfs_handle[i].fdId = -1;
+}
+
+static struct yaffsfs_Handle *yaffsfs_HandleToPointer(int h)
+{
+	if (h >= 0 && h < YAFFSFS_N_HANDLES)
+		return &yaffsfs_handle[h];
+	return NULL;
+}
+
+static struct yaffsfs_FileDes *yaffsfs_HandleToFileDes(int handle)
+{
+	struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
+
+	if (h && h->useCount > 0 && h->fdId >= 0 && h->fdId < YAFFSFS_N_HANDLES)
+		return &yaffsfs_fd[h->fdId];
+
+	return NULL;
+}
+
+static struct yaffsfs_Inode *yaffsfs_HandleToInode(int handle)
+{
+	struct yaffsfs_FileDes *fd = yaffsfs_HandleToFileDes(handle);
+
+	if (fd && fd->handleCount > 0 &&
+	    fd->inodeId >= 0 && fd->inodeId < YAFFSFS_N_HANDLES)
+		return &yaffsfs_inode[fd->inodeId];
+
+	return NULL;
+}
+
+static struct yaffs_obj *yaffsfs_HandleToObject(int handle)
+{
+	struct yaffsfs_Inode *in = yaffsfs_HandleToInode(handle);
+
+	if (in)
+		return in->iObj;
+
+	return NULL;
+}
+
+/*
+ * yaffsfs_FindInodeIdForObject
+ * Find the inode entry for an object, if it exists.
+ */
+
+static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
+{
+	int i;
+	int ret = -1;
+
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	/* Look for it in open inode table */
+	for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
+		if (yaffsfs_inode[i].iObj == obj)
+			ret = i;
+	}
+	return ret;
+}
+
+/*
+ * yaffsfs_GetInodeIdForObject
+ * Grab an inode entry when opening a new inode.
+ */
+static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
+{
+	int i;
+	int ret;
+	struct yaffsfs_Inode *in = NULL;
+
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	ret = yaffsfs_FindInodeIdForObject(obj);
+
+	for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
+		if (!yaffsfs_inode[i].iObj)
+			ret = i;
+	}
+
+	if (ret >= 0) {
+		in = &yaffsfs_inode[ret];
+		if (!in->iObj)
+			in->count = 0;
+		in->iObj = obj;
+		in->count++;
+	}
+
+	return ret;
+}
+
+static int yaffsfs_CountHandles(struct yaffs_obj *obj)
+{
+	int i = yaffsfs_FindInodeIdForObject(obj);
+
+	if (i >= 0)
+		return yaffsfs_inode[i].count;
+	else
+		return 0;
+}
+
+static void yaffsfs_ReleaseInode(struct yaffsfs_Inode *in)
+{
+	struct yaffs_obj *obj;
+
+	obj = in->iObj;
+	obj->my_inode = NULL;
+	in->iObj = NULL;
+
+	if (obj->unlinked)
+		yaffs_del_obj(obj);
+}
+
+static void yaffsfs_PutInode(int inodeId)
+{
+	if (inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES) {
+		struct yaffsfs_Inode *in = &yaffsfs_inode[inodeId];
+		in->count--;
+		if (in->count <= 0) {
+			yaffsfs_ReleaseInode(in);
+			in->count = 0;
+		}
+	}
+}
+
+static int yaffsfs_NewHandle(struct yaffsfs_Handle **hptr)
+{
+	int i;
+	struct yaffsfs_Handle *h;
+
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		h = &yaffsfs_handle[i];
+		if (h->useCount < 1) {
+			memset(h, 0, sizeof(struct yaffsfs_Handle));
+			h->fdId = -1;
+			h->useCount = 1;
+			if (hptr)
+				*hptr = h;
+			return i;
+		}
+	}
+	return -1;
+}
+
+static int yaffsfs_NewHandleAndFileDes(void)
+{
+	int i;
+	struct yaffsfs_FileDes *fd;
+	struct yaffsfs_Handle *h = NULL;
+	int handle = yaffsfs_NewHandle(&h);
+
+	if (handle < 0)
+		return -1;
+
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		fd = &yaffsfs_fd[i];
+		if (fd->handleCount < 1) {
+			memset(fd, 0, sizeof(struct yaffsfs_FileDes));
+			fd->inodeId = -1;
+			fd->handleCount = 1;
+			h->fdId = i;
+			return handle;
+		}
+	}
+
+	/* Dump the handle because we could not get a fd */
+	h->useCount = 0;
+	return -1;
+}
+
+/*
+ * yaffs_get_handle
+ * Increase use of handle when reading/writing a file
+ * Also gets the file descriptor.
+ */
+
+static int yaffsfs_GetHandle(int handle)
+{
+	struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
+
+	if (h && h->useCount > 0) {
+		h->useCount++;
+		return 0;
+	}
+	return -1;
+}
+
+/*
+ * yaffs_put_handle
+ * Let go of a handle when closing a file or aborting an open or
+ * ending a read or write.
+ */
+
+static int yaffsfs_PutFileDes(int fdId)
+{
+	struct yaffsfs_FileDes *fd;
+
+	if (fdId >= 0 && fdId < YAFFSFS_N_HANDLES) {
+		fd = &yaffsfs_fd[fdId];
+		fd->handleCount--;
+		if (fd->handleCount < 1) {
+			if (fd->isDir)
+				yaffsfs_closedir_no_lock(fd->v.dir);
+			if (fd->inodeId >= 0) {
+				yaffsfs_PutInode(fd->inodeId);
+				fd->inodeId = -1;
+			}
+		}
+	}
+	return 0;
+}
+
+static int yaffsfs_PutHandle(int handle)
+{
+	struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
+
+	if (h && h->useCount > 0) {
+		h->useCount--;
+		if (h->useCount < 1) {
+			yaffsfs_PutFileDes(h->fdId);
+			h->fdId = -1;
+		}
+	}
+
+	return 0;
+}
+
+static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
+{
+	struct yaffsfs_FileDes *fd;
+	struct yaffsfs_Handle *h;
+	struct yaffs_obj *obj;
+	int i;
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		h = yaffsfs_HandleToPointer(i);
+		fd = yaffsfs_HandleToFileDes(i);
+		obj = yaffsfs_HandleToObject(i);
+		if (h && h->useCount > 0) {
+			h->useCount = 0;
+			h->fdId = 0;
+		}
+		if (fd && fd->handleCount > 0 && obj && obj->my_dev == dev) {
+			fd->handleCount = 0;
+			yaffsfs_PutInode(fd->inodeId);
+			fd->inodeId = -1;
+		}
+	}
+}
+
+/*
+ *  Stuff to handle names.
+ */
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+#ifndef CONFIG_YAFFS_WINCE
+static int yaffs_toupper(YCHAR a)
+{
+	if (a >= 'a' && a <= 'z')
+		return (a - 'a') + 'A';
+	else
+		return a;
+}
+#endif
+
+static int yaffsfs_Match(YCHAR a, YCHAR b)
+{
+	return (yaffs_toupper(a) == yaffs_toupper(b));
+}
+#else
+static int yaffsfs_Match(YCHAR a, YCHAR b)
+{
+	/* case sensitive */
+	return (a == b);
+}
+#endif
+
+static int yaffsfs_IsPathDivider(YCHAR ch)
+{
+	const YCHAR *str = YAFFS_PATH_DIVIDERS;
+
+	while (*str) {
+		if (*str == ch)
+			return 1;
+		str++;
+	}
+
+	return 0;
+}
+
+static int yaffsfs_CheckNameLength(const YCHAR *name)
+{
+	int retVal = 0;
+
+	int nameLength = yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH + 1);
+
+	if (nameLength == 0) {
+		yaffsfs_SetError(-ENOENT);
+		retVal = -1;
+	} else if (nameLength > YAFFS_MAX_NAME_LENGTH) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		retVal = -1;
+	}
+
+	return retVal;
+}
+
+static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
+{
+	YCHAR *alt_path = NULL;
+	int path_length;
+	int i;
+
+	/*
+	 * We don't have a definition for max path length.
+	 * We will use 3 * max name length instead.
+	 */
+	*ret_path = NULL;
+	path_length = yaffs_strnlen(path, (YAFFS_MAX_NAME_LENGTH + 1) * 3 + 1);
+
+	/* If the last character is a path divider, then we need to
+	 * trim it back so that the name look-up works properly.
+	 * eg. /foo/new_dir/ -> /foo/newdir
+	 * Curveball: Need to handle multiple path dividers:
+	 * eg. /foof/sdfse///// -> /foo/sdfse
+	 */
+	if (path_length > 0 && yaffsfs_IsPathDivider(path[path_length - 1])) {
+		alt_path = kmalloc(path_length + 1, 0);
+		if (!alt_path)
+			return -1;
+		yaffs_strcpy(alt_path, path);
+		for (i = path_length - 1;
+		     i >= 0 && yaffsfs_IsPathDivider(alt_path[i]); i--)
+			alt_path[i] = (YCHAR) 0;
+	}
+	*ret_path = alt_path;
+	return 0;
+}
+
+LIST_HEAD(yaffsfs_deviceList);
+
+/*
+ * yaffsfs_FindDevice
+ * yaffsfs_FindRoot
+ * Scan the configuration list to find the device
+ * Curveballs: Should match paths that end in '/' too
+ * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
+ */
+static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path,
+					    YCHAR **restOfPath)
+{
+	struct list_head *cfg;
+	const YCHAR *leftOver;
+	const YCHAR *p;
+	struct yaffs_dev *retval = NULL;
+	struct yaffs_dev *dev = NULL;
+	int thisMatchLength;
+	int longestMatch = -1;
+	int matching;
+
+	/*
+	 * Check all configs, choose the one that:
+	 * 1) Actually matches a prefix (ie /a amd /abc will not match
+	 * 2) Matches the longest.
+	 */
+	list_for_each(cfg, &yaffsfs_deviceList) {
+		dev = list_entry(cfg, struct yaffs_dev, dev_list);
+		leftOver = path;
+		p = dev->param.name;
+		thisMatchLength = 0;
+		matching = 1;
+
+		if(!p)
+			continue;
+
+		while (matching && *p && *leftOver) {
+			/* Skip over any /s */
+			while (yaffsfs_IsPathDivider(*p))
+				p++;
+
+			/* Skip over any /s */
+			while (yaffsfs_IsPathDivider(*leftOver))
+				leftOver++;
+
+			/* Now match the text part */
+			while (matching &&
+			       *p && !yaffsfs_IsPathDivider(*p) &&
+			       *leftOver && !yaffsfs_IsPathDivider(*leftOver)) {
+				if (yaffsfs_Match(*p, *leftOver)) {
+					p++;
+					leftOver++;
+					thisMatchLength++;
+				} else {
+					matching = 0;
+				}
+			}
+		}
+
+		/* Skip over any /s in leftOver */
+		while (yaffsfs_IsPathDivider(*leftOver))
+			leftOver++;
+
+		/*Skip over any /s in p */
+		while (yaffsfs_IsPathDivider(*p))
+			p++;
+
+		/* p should now be at the end of the string if fully matched */
+		if (*p)
+			matching = 0;
+
+		if (matching && (thisMatchLength > longestMatch)) {
+			/* Matched prefix */
+			*restOfPath = (YCHAR *) leftOver;
+			retval = dev;
+			longestMatch = thisMatchLength;
+		}
+
+	}
+	return retval;
+}
+
+static int yaffsfs_CheckPath(const YCHAR *path)
+{
+	int n = 0;
+	int divs = 0;
+
+	while (*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100) {
+		if (yaffsfs_IsPathDivider(*path)) {
+			n = 0;
+			divs++;
+		} else
+			n++;
+		path++;
+	}
+
+	return (*path) ? -1 : 0;
+}
+
+/* FindMountPoint only returns a dev entry if the path is a mount point */
+static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
+{
+	struct yaffs_dev *dev;
+	YCHAR *restOfPath = NULL;
+
+	dev = yaffsfs_FindDevice(path, &restOfPath);
+	if (dev && restOfPath && *restOfPath)
+		dev = NULL;
+	return dev;
+}
+
+static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path,
+					  YCHAR **restOfPath)
+{
+	struct yaffs_dev *dev;
+
+	dev = yaffsfs_FindDevice(path, restOfPath);
+	if (dev && dev->is_mounted)
+		return dev->root_dir;
+
+	return NULL;
+}
+
+static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
+					    int symDepth, int *loop)
+{
+
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	while (obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		YCHAR *alias = obj->variant.symlink_variant.alias;
+
+		if (yaffsfs_IsPathDivider(*alias))
+			/*
+			 * Starts with a /, need to scan from root up */
+			/* NB Might not work if this is called with root != NULL
+			*/
+			obj = yaffsfs_FindObject(NULL, alias, symDepth++,
+						 1, NULL, NULL, loop);
+		else
+			/*
+			 * Relative to here so use the parent of the
+			 * symlink as a start
+			 */
+			obj = yaffsfs_FindObject(obj->parent, alias, symDepth++,
+						 1, NULL, NULL, loop);
+	}
+	return obj;
+}
+
+/*
+ * yaffsfs_FindDirectory
+ * Parse a path to determine the directory and the name within the directory.
+ *
+ * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
+ */
+static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
+						 const YCHAR *path,
+						 YCHAR **name, int symDepth,
+						 int *notDir, int *loop)
+{
+	struct yaffs_obj *dir;
+	YCHAR *restOfPath;
+	YCHAR str[YAFFS_MAX_NAME_LENGTH + 1];
+	int i;
+
+	if (symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES) {
+		if (loop)
+			*loop = 1;
+		return NULL;
+	}
+
+	if (startDir) {
+		dir = startDir;
+		restOfPath = (YCHAR *) path;
+	} else
+		dir = yaffsfs_FindRoot(path, &restOfPath);
+
+	while (dir) {
+		/*
+		 * parse off /.
+		 * curve ball: also throw away surplus '/'
+		 * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
+		 */
+		while (yaffsfs_IsPathDivider(*restOfPath))
+			restOfPath++;	/* get rid of '/' */
+
+		*name = restOfPath;
+		i = 0;
+
+		while (*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)) {
+			if (i < YAFFS_MAX_NAME_LENGTH) {
+				str[i] = *restOfPath;
+				str[i + 1] = '\0';
+				i++;
+			}
+			restOfPath++;
+		}
+
+		if (!*restOfPath)
+			/* got to the end of the string */
+			return dir;
+		else {
+			if (yaffs_strcmp(str, _Y(".")) == 0) {
+				/* Do nothing */
+			} else if (yaffs_strcmp(str, _Y("..")) == 0) {
+				dir = dir->parent;
+			} else {
+				dir = yaffs_find_by_name(dir, str);
+
+				dir = yaffsfs_FollowLink(dir, symDepth, loop);
+
+				if (dir && dir->variant_type !=
+				    YAFFS_OBJECT_TYPE_DIRECTORY) {
+					if (notDir)
+						*notDir = 1;
+					dir = NULL;
+				}
+
+			}
+		}
+	}
+	/* directory did not exist. */
+	return NULL;
+}
+
+static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
+					       const YCHAR *path,
+					       YCHAR **name,
+					       int symDepth,
+					       int *notDir, int *loop)
+{
+	return yaffsfs_DoFindDirectory(relDir, path, name, symDepth, notDir,
+						loop);
+}
+
+/*
+ * yaffsfs_FindObject turns a path for an existing object into the object
+ */
+static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relDir,
+					    const YCHAR *path, int symDepth,
+					    int getEquiv,
+					    struct yaffs_obj **dirOut,
+					    int *notDir, int *loop)
+{
+	struct yaffs_obj *dir;
+	struct yaffs_obj *obj;
+	YCHAR *name;
+
+	dir =
+	    yaffsfs_FindDirectory(relDir, path, &name, symDepth, notDir, loop);
+
+	if (dirOut)
+		*dirOut = dir;
+
+	if (dir && *name)
+		obj = yaffs_find_by_name(dir, name);
+	else
+		obj = dir;
+
+	if (getEquiv)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	return obj;
+}
+
+/*************************************************************************
+ *	Start of yaffsfs visible functions.
+ *************************************************************************/
+
+int yaffs_dup(int handle)
+{
+	int newHandleNumber = -1;
+	struct yaffsfs_FileDes *existingFD = NULL;
+	struct yaffsfs_Handle *existingHandle = NULL;
+	struct yaffsfs_Handle *newHandle = NULL;
+
+	yaffsfs_Lock();
+	existingHandle = yaffsfs_HandleToPointer(handle);
+	existingFD = yaffsfs_HandleToFileDes(handle);
+	if (existingFD)
+		newHandleNumber = yaffsfs_NewHandle(&newHandle);
+	if (newHandle) {
+		newHandle->fdId = existingHandle->fdId;
+		existingFD->handleCount++;
+	}
+
+	yaffsfs_Unlock();
+
+	if (!existingFD)
+		yaffsfs_SetError(-EBADF);
+	else if (!newHandle)
+		yaffsfs_SetError(-ENOMEM);
+
+	return newHandleNumber;
+
+}
+
+static int yaffsfs_TooManyObjects(struct yaffs_dev *dev)
+{
+	int current_objects = dev->n_obj - dev->n_deleted_files;
+
+	if (dev->param.max_objects && current_objects > dev->param.max_objects)
+		return 1;
+	else
+		return 0;
+}
+
+int yaffs_open_sharing_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			int oflag, int mode, int sharing)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	YCHAR *name;
+	int handle = -1;
+	struct yaffsfs_FileDes *fd = NULL;
+	int openDenied = 0;
+	int symDepth = 0;
+	int errorReported = 0;
+	int rwflags = oflag & (O_RDWR | O_RDONLY | O_WRONLY);
+	u8 shareRead = (sharing & YAFFS_SHARE_READ) ? 1 : 0;
+	u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
+	u8 sharedReadAllowed;
+	u8 sharedWriteAllowed;
+	u8 alreadyReading;
+	u8 alreadyWriting;
+	u8 readRequested;
+	u8 writeRequested;
+	int notDir = 0;
+	int loop = 0;
+	int is_dir = 0;
+	yaffs_DIR *dsc;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0)< 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	/* O_EXCL only has meaning if O_CREAT is specified */
+	if (!(oflag & O_CREAT))
+		oflag &= ~(O_EXCL);
+
+	/* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
+	if ((oflag & O_CREAT) & (oflag & O_EXCL))
+		oflag &= ~(O_TRUNC);
+
+	/* Todo: Are there any more flag combos to sanitise ? */
+
+	/* Figure out if reading or writing is requested */
+
+	readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
+	writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
+
+	yaffsfs_Lock();
+
+	handle = yaffsfs_NewHandleAndFileDes();
+
+	if (handle < 0) {
+		yaffsfs_SetError(-ENFILE);
+		errorReported = 1;
+	} else {
+
+		fd = yaffsfs_HandleToFileDes(handle);
+
+		/* try to find the exisiting object */
+		obj = yaffsfs_FindObject(reldir, path, 0, 1, NULL, NULL, NULL);
+
+		obj = yaffsfs_FollowLink(obj, symDepth++, &loop);
+
+		if (obj &&
+		    obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
+		    obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+			obj = NULL;
+
+		if (obj) {
+
+			/* The file already exists or it might be a directory */
+			is_dir = (obj->variant_type ==
+					YAFFS_OBJECT_TYPE_DIRECTORY);
+
+			/* A directory can't be opened except for read */
+			if ( is_dir &&
+			    (writeRequested || !readRequested ||
+				(oflag & ~O_RDONLY))) {
+				openDenied = 1;
+				yaffsfs_SetError(-EISDIR);
+				errorReported = 1;
+			}
+
+			if(is_dir) {
+				dsc = yaffsfs_opendir_reldir_no_lock(reldir, path);
+				if (!dsc) {
+					openDenied = 1;
+					yaffsfs_SetError(-ENFILE);
+					errorReported = 1;
+				}
+			}
+
+			/* Open should fail if O_CREAT and O_EXCL are specified
+			 * for a file that exists.
+			 */
+			if (!errorReported &&
+			    (oflag & O_EXCL) && (oflag & O_CREAT)) {
+				openDenied = 1;
+				yaffsfs_SetError(-EEXIST);
+				errorReported = 1;
+			}
+
+			/* Check file permissions */
+			if (readRequested && !(obj->yst_mode & S_IREAD))
+				openDenied = 1;
+
+			if (writeRequested && !(obj->yst_mode & S_IWRITE))
+				openDenied = 1;
+
+			if (!errorReported && writeRequested &&
+			    obj->my_dev->read_only) {
+				openDenied = 1;
+				yaffsfs_SetError(-EROFS);
+				errorReported = 1;
+			}
+
+			if (openDenied && !errorReported) {
+				yaffsfs_SetError(-EACCES);
+				errorReported = 1;
+			}
+
+			/* Check sharing of an existing object. */
+			if (!openDenied) {
+				struct yaffsfs_FileDes *fdx;
+				int i;
+
+				sharedReadAllowed = 1;
+				sharedWriteAllowed = 1;
+				alreadyReading = 0;
+				alreadyWriting = 0;
+				for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+					fdx = &yaffsfs_fd[i];
+					if (fdx->handleCount > 0 &&
+					    fdx->inodeId >= 0 &&
+					    yaffsfs_inode[fdx->inodeId].iObj
+					    == obj) {
+						if (!fdx->shareRead)
+							sharedReadAllowed = 0;
+						if (!fdx->shareWrite)
+							sharedWriteAllowed = 0;
+						if (fdx->reading)
+							alreadyReading = 1;
+						if (fdx->writing)
+							alreadyWriting = 1;
+					}
+				}
+
+				if ((!sharedReadAllowed && readRequested) ||
+				    (!shareRead && alreadyReading) ||
+				    (!sharedWriteAllowed && writeRequested) ||
+				    (!shareWrite && alreadyWriting)) {
+					openDenied = 1;
+					yaffsfs_SetError(-EBUSY);
+					errorReported = 1;
+				}
+			}
+
+		}
+
+		/* If we could not open an existing object, then let's see if
+		 * the directory exists. If not, error.
+		 */
+		if (!obj && !errorReported) {
+			dir = yaffsfs_FindDirectory(reldir, path, &name, 0,
+						    &notDir, &loop);
+			if (!dir && notDir) {
+				yaffsfs_SetError(-ENOTDIR);
+				errorReported = 1;
+			} else if (loop) {
+				yaffsfs_SetError(-ELOOP);
+				errorReported = 1;
+			} else if (!dir) {
+				yaffsfs_SetError(-ENOENT);
+				errorReported = 1;
+			}
+		}
+
+		if (!obj && dir && !errorReported && (oflag & O_CREAT)) {
+			/* Let's see if we can create this file */
+			if (dir->my_dev->read_only) {
+				yaffsfs_SetError(-EROFS);
+				errorReported = 1;
+			} else if (yaffsfs_TooManyObjects(dir->my_dev)) {
+				yaffsfs_SetError(-ENFILE);
+				errorReported = 1;
+			} else
+				obj = yaffs_create_file(dir, name, mode, 0, 0);
+
+			if (!obj && !errorReported) {
+				yaffsfs_SetError(-ENOSPC);
+				errorReported = 1;
+			}
+		}
+
+		if (!obj && dir && !errorReported && !(oflag & O_CREAT)) {
+			yaffsfs_SetError(-ENOENT);
+			errorReported = 1;
+		}
+
+		if (obj && !openDenied) {
+			int inodeId = yaffsfs_GetInodeIdForObject(obj);
+
+			if (inodeId < 0) {
+				/*
+				 * Todo: Fix any problem if inodes run out,
+				 * That can't happen if the number of inode
+				 * items >= number of handles.
+				 */
+			}
+
+			fd->inodeId = inodeId;
+			fd->reading = readRequested;
+			fd->writing = writeRequested;
+			fd->append = (oflag & O_APPEND) ? 1 : 0;
+			fd->shareRead = shareRead;
+			fd->shareWrite = shareWrite;
+			fd->isDir = is_dir;
+
+			if(is_dir)
+				fd->v.dir = dsc;
+			else
+				fd->v.position = 0;
+
+			/* Hook inode to object */
+			obj->my_inode = (void *)&yaffsfs_inode[inodeId];
+
+			if (!is_dir && (oflag & O_TRUNC) && fd->writing)
+				yaffs_resize_file(obj, 0);
+		} else {
+			yaffsfs_PutHandle(handle);
+			if (!errorReported)
+				yaffsfs_SetError(0);	/* Problem */
+			handle = -1;
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return handle;
+}
+
+int yaffs_open_sharing_reldev(struct yaffs_dev *dev, const YCHAR *path, int oflag,
+				int mode, int sharing)
+{
+	return yaffs_open_sharing_reldir(ROOT_DIR(dev), path,
+					oflag, mode, sharing);
+}
+
+int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
+{
+	return yaffs_open_sharing_reldir(NULL, path, oflag, mode, sharing);
+}
+
+int yaffs_open_reldir(struct yaffs_obj *reldir,const YCHAR *path, int oflag, int mode)
+{
+	return yaffs_open_sharing_reldir(reldir, path, oflag, mode,
+				  YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
+}
+
+int yaffs_open_reldev(struct yaffs_dev *dev,const YCHAR *path, int oflag, int mode)
+{
+	return yaffs_open_sharing_reldir(ROOT_DIR(dev), path, oflag, mode,
+				  YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
+}
+
+int yaffs_open(const YCHAR *path, int oflag, int mode)
+{
+	return yaffs_open_reldir(NULL, path, oflag, mode);
+}
+
+static int yaffs_Dofsync(int handle, int datasync)
+{
+	int retVal = -1;
+	struct yaffs_obj *obj;
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_HandleToObject(handle);
+
+	if (!obj)
+		yaffsfs_SetError(-EBADF);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else {
+		yaffs_flush_file(obj, 1, datasync, 0);
+		retVal = 0;
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+int yaffs_fsync(int handle)
+{
+	return yaffs_Dofsync(handle, 0);
+}
+
+int yaffs_flush(int handle)
+{
+	return yaffs_fsync(handle);
+}
+
+int yaffs_fdatasync(int handle)
+{
+	return yaffs_Dofsync(handle, 1);
+}
+
+int yaffs_close(int handle)
+{
+	struct yaffsfs_Handle *h = NULL;
+	struct yaffsfs_FileDes *f;
+	struct yaffs_obj *obj = NULL;
+	int retVal = -1;
+
+	yaffsfs_Lock();
+
+	h = yaffsfs_HandleToPointer(handle);
+	f = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
+
+	if (!h || !obj || !f)
+		yaffsfs_SetError(-EBADF);
+	else {
+		/* clean up */
+		if(!f->isDir)
+			yaffs_flush_file(obj, 1, 0, 1);
+		yaffsfs_PutHandle(handle);
+		retVal = 0;
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffsfs_do_read(int handle, void *vbuf, unsigned int nbyte,
+		    int isPread, Y_LOFF_T offset)
+{
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
+	Y_LOFF_T pos = 0;
+	Y_LOFF_T startPos = 0;
+	Y_LOFF_T endPos = 0;
+	int nRead = 0;
+	int nToRead = 0;
+	int totalRead = 0;
+	Y_LOFF_T maxRead;
+	u8 *buf = (u8 *) vbuf;
+
+	if (yaffsfs_CheckMemRegion(vbuf, nbyte, 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
+
+	if (!fd || !obj) {
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+		totalRead = -1;
+	} else if (!fd->reading) {
+		/* Not a reading handle */
+		yaffsfs_SetError(-EINVAL);
+		totalRead = -1;
+	} 
+ 	else if (nbyte > YAFFS_MAX_FILE_SIZE) {
+		yaffsfs_SetError(-EINVAL);
+		totalRead = -1;
+	} 
+	else {
+		if (isPread)
+			startPos = offset;
+		else
+			startPos = fd->v.position;
+
+		pos = startPos;
+
+		if (yaffs_get_obj_length(obj) > pos)
+			maxRead = yaffs_get_obj_length(obj) - pos;
+		else
+			maxRead = 0;
+
+		if ((s32)nbyte > maxRead)
+			nbyte = maxRead;
+
+		yaffsfs_GetHandle(handle);
+
+		endPos = pos + nbyte;
+		if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
+		    nbyte > YAFFS_MAX_FILE_SIZE || 
+		    endPos < 0 ||
+		    endPos > YAFFS_MAX_FILE_SIZE) {
+			totalRead = -1;
+			nbyte = 0;
+		}
+
+		while (nbyte > 0) {
+			nToRead = YAFFSFS_RW_SIZE -
+			    (pos & (YAFFSFS_RW_SIZE - 1));
+			if (nToRead > (s32)nbyte)
+				nToRead = nbyte;
+
+			/* Tricky bit...
+			 * Need to reverify object in case the device was
+			 * unmounted in another thread.
+			 */
+			obj = yaffsfs_HandleToObject(handle);
+			if (!obj)
+				nRead = 0;
+			else
+				nRead = yaffs_file_rd(obj, buf, pos, nToRead);
+
+			if (nRead > 0) {
+				totalRead += nRead;
+				pos += nRead;
+				buf += nRead;
+			}
+
+			if (nRead == nToRead)
+				nbyte -= nRead;
+			else
+				nbyte = 0;	/* no more to read */
+
+			if (nbyte > 0) {
+				yaffsfs_Unlock();
+				yaffsfs_Lock();
+			}
+
+		}
+
+		yaffsfs_PutHandle(handle);
+
+		if (!isPread) {
+			if (totalRead >= 0)
+				fd->v.position = startPos + totalRead;
+			else
+				yaffsfs_SetError(-EINVAL);
+		}
+
+	}
+
+	yaffsfs_Unlock();
+
+	return (totalRead >= 0) ? totalRead : -1;
+
+}
+
+int yaffs_read(int handle, void *buf, unsigned int nbyte)
+{
+	return yaffsfs_do_read(handle, buf, nbyte, 0, 0);
+}
+
+int yaffs_pread(int handle, void *buf, unsigned int nbyte, Y_LOFF_T offset)
+{
+	return yaffsfs_do_read(handle, buf, nbyte, 1, offset);
+}
+
+static int yaffsfs_do_write(int handle, const void *vbuf, unsigned int nbyte,
+		     int isPwrite, Y_LOFF_T offset)
+{
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
+	Y_LOFF_T pos = 0;
+	Y_LOFF_T startPos = 0;
+	Y_LOFF_T endPos;
+	int nWritten = 0;
+	int totalWritten = 0;
+	int write_trhrough = 0;
+	int nToWrite = 0;
+	const u8 *buf = (const u8 *)vbuf;
+
+	if (yaffsfs_CheckMemRegion(vbuf, nbyte, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
+
+	if (!fd || !obj) {
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+		totalWritten = -1;
+	} else if (!fd->writing) {
+		yaffsfs_SetError(-EINVAL);
+		totalWritten = -1;
+	} else if (obj->my_dev->read_only) {
+		yaffsfs_SetError(-EROFS);
+		totalWritten = -1;
+	} else {
+		if (fd->append)
+			startPos = yaffs_get_obj_length(obj);
+		else if (isPwrite)
+			startPos = offset;
+		else
+			startPos = fd->v.position;
+
+		yaffsfs_GetHandle(handle);
+		pos = startPos;
+		endPos = pos + nbyte;
+
+		if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE || 
+		    nbyte > YAFFS_MAX_FILE_SIZE || 
+		    endPos < 0 ||  
+		    endPos > YAFFS_MAX_FILE_SIZE) {
+			totalWritten = -1;
+			nbyte = 0;
+		}
+
+		while (nbyte > 0) {
+
+			nToWrite = YAFFSFS_RW_SIZE -
+			    (pos & (YAFFSFS_RW_SIZE - 1));
+			if (nToWrite > (s32)nbyte)
+				nToWrite = nbyte;
+
+			/* Tricky bit...
+			 * Need to reverify object in case the device was
+			 * remounted or unmounted in another thread.
+			 */
+			obj = yaffsfs_HandleToObject(handle);
+			if (!obj || obj->my_dev->read_only)
+				nWritten = 0;
+			else
+				nWritten =
+				    yaffs_wr_file(obj, buf, pos, nToWrite,
+						  write_trhrough);
+			if (nWritten > 0) {
+				totalWritten += nWritten;
+				pos += nWritten;
+				buf += nWritten;
+			}
+
+			if (nWritten == nToWrite)
+				nbyte -= nToWrite;
+			else
+				nbyte = 0;
+
+			if (nWritten < 1 && totalWritten < 1) {
+				yaffsfs_SetError(-ENOSPC);
+				totalWritten = -1;
+			}
+
+			if (nbyte > 0) {
+				yaffsfs_Unlock();
+				yaffsfs_Lock();
+			}
+		}
+
+		yaffsfs_PutHandle(handle);
+
+		if (!isPwrite) {
+			if (totalWritten > 0)
+				fd->v.position = startPos + totalWritten;
+			else
+				yaffsfs_SetError(-EINVAL);
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return (totalWritten >= 0) ? totalWritten : -1;
+}
+
+int yaffs_write(int fd, const void *buf, unsigned int nbyte)
+{
+	return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
+}
+
+int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, Y_LOFF_T offset)
+{
+	return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
+}
+
+int yaffs_truncate_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+				Y_LOFF_T new_size)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int result = YAFFS_FAIL;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+	obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		yaffsfs_SetError(-EISDIR);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
+		yaffsfs_SetError(-EINVAL);
+	else
+		result = yaffs_resize_file(obj, new_size);
+
+	yaffsfs_Unlock();
+
+	return (result) ? 0 : -1;
+}
+
+int yaffs_truncate_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			Y_LOFF_T new_size)
+{
+	return yaffs_truncate_reldir(ROOT_DIR(dev), path, new_size);
+}
+
+int yaffs_truncate(const YCHAR *path, Y_LOFF_T new_size)
+{
+	return yaffs_truncate_reldir(NULL, path, new_size);
+}
+
+int yaffs_ftruncate(int handle, Y_LOFF_T new_size)
+{
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
+	int result = 0;
+
+	yaffsfs_Lock();
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
+
+	if (!fd || !obj)
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+	else if (!fd->writing)
+		yaffsfs_SetError(-EINVAL);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
+		yaffsfs_SetError(-EINVAL);
+	else
+		/* resize the file */
+		result = yaffs_resize_file(obj, new_size);
+	yaffsfs_Unlock();
+
+	return (result) ? 0 : -1;
+
+}
+
+Y_LOFF_T yaffs_lseek(int handle, Y_LOFF_T offset, int whence)
+{
+	struct yaffsfs_FileDes *fd = NULL;
+	struct yaffs_obj *obj = NULL;
+	Y_LOFF_T pos = -1;
+	Y_LOFF_T fSize = -1;
+
+	yaffsfs_Lock();
+	fd = yaffsfs_HandleToFileDes(handle);
+	obj = yaffsfs_HandleToObject(handle);
+
+	if (!fd || !obj)
+		yaffsfs_SetError(-EBADF);
+	else if (offset > YAFFS_MAX_FILE_SIZE)
+		yaffsfs_SetError(-EINVAL);
+	else {
+		if (whence == SEEK_SET) {
+			if (offset >= 0)
+				pos = offset;
+		} else if (whence == SEEK_CUR) {
+			if ((fd->v.position + offset) >= 0)
+				pos = (fd->v.position + offset);
+		} else if (whence == SEEK_END) {
+			fSize = yaffs_get_obj_length(obj);
+			if (fSize >= 0 && (fSize + offset) >= 0)
+				pos = fSize + offset;
+		}
+
+		if (pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
+			fd->v.position = pos;
+		else {
+			yaffsfs_SetError(-EINVAL);
+			pos = -1;
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return pos;
+}
+
+static int yaffsfs_DoUnlink_reldir(struct yaffs_obj *reldir,
+				const YCHAR *path, int isDirectory)
+{
+	struct yaffs_obj *dir = NULL;
+	struct yaffs_obj *obj = NULL;
+	YCHAR *name;
+	int result = YAFFS_FAIL;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 0, NULL, NULL, NULL);
+	dir = yaffsfs_FindDirectory(reldir, path, &name, 0, &notDir, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir)
+		yaffsfs_SetError(-ENOENT);
+	else if (yaffs_strncmp(name, _Y("."), 2) == 0)
+		yaffsfs_SetError(-EINVAL);
+	else if (!obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (!isDirectory &&
+		 obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+		yaffsfs_SetError(-EISDIR);
+	else if (isDirectory &&
+		 obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (isDirectory && obj == obj->my_dev->root_dir)
+		yaffsfs_SetError(-EBUSY);	/* Can't rmdir a root */
+	else {
+		result = yaffs_unlinker(dir, name);
+
+		if (result == YAFFS_FAIL && isDirectory)
+			yaffsfs_SetError(-ENOTEMPTY);
+	}
+
+	yaffsfs_Unlock();
+
+	return (result == YAFFS_FAIL) ? -1 : 0;
+}
+
+int yaffs_unlink_reldir(struct yaffs_obj *reldir, const YCHAR *path)
+{
+	return yaffsfs_DoUnlink_reldir(reldir, path, 0);
+}
+
+int yaffs_unlink_reldev(struct yaffs_dev *dev, const YCHAR *path)
+{
+	return yaffsfs_DoUnlink_reldir(ROOT_DIR(dev), path, 0);
+}
+
+int yaffs_unlink(const YCHAR *path)
+{
+	return yaffs_unlink_reldir(NULL, path);
+}
+
+static int rename_file_over_dir(struct yaffs_obj *obj, struct yaffs_obj *newobj)
+{
+	if (obj && obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY &&
+	    newobj && newobj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+		return 1;
+	else
+		return 0;
+}
+
+static int rename_dir_over_file(struct yaffs_obj *obj, struct yaffs_obj *newobj)
+{
+	if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
+	    newobj && newobj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		return 1;
+	else
+		return 0;
+}
+
+int yaffs_rename_reldir(struct yaffs_obj *reldir,
+			const YCHAR *oldPath, const YCHAR *newPath)
+{
+	struct yaffs_obj *olddir = NULL;
+	struct yaffs_obj *newdir = NULL;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *newobj = NULL;
+	YCHAR *oldname;
+	YCHAR *newname;
+	int result = YAFFS_FAIL;
+	int rename_allowed = 1;
+	int notOldDir = 0;
+	int notNewDir = 0;
+	int oldLoop = 0;
+	int newLoop = 0;
+
+	YCHAR *alt_newpath = NULL;
+
+	if (yaffsfs_CheckMemRegion(oldPath, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(newPath, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(oldPath) < 0 || yaffsfs_CheckPath(newPath) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0) {
+		yaffsfs_SetError(-ENOMEM);
+		return -1;
+	}
+	if (alt_newpath)
+		newPath = alt_newpath;
+
+	yaffsfs_Lock();
+
+	olddir = yaffsfs_FindDirectory(reldir, oldPath, &oldname, 0,
+				       &notOldDir, &oldLoop);
+	newdir = yaffsfs_FindDirectory(reldir, newPath, &newname, 0,
+				       &notNewDir, &newLoop);
+	obj = yaffsfs_FindObject(reldir, oldPath, 0, 0, NULL, NULL, NULL);
+	newobj = yaffsfs_FindObject(reldir, newPath, 0, 0, NULL, NULL, NULL);
+
+	/* If the object being renamed is a directory and the
+	 * path ended with a "/" then the olddir == obj.
+	 * We pass through NULL for the old name to tell the lower layers
+	 * to use olddir as the object.
+	 */
+
+	if (olddir == obj)
+		oldname = NULL;
+
+	if ((!olddir && notOldDir) || (!newdir && notNewDir)) {
+		yaffsfs_SetError(-ENOTDIR);
+		rename_allowed = 0;
+	} else if (oldLoop || newLoop) {
+		yaffsfs_SetError(-ELOOP);
+		rename_allowed = 0;
+	} else if (olddir && oldname &&
+			yaffs_strncmp(oldname, _Y("."), 2) == 0) {
+		yaffsfs_SetError(-EINVAL);
+		rename_allowed = 0;
+	} else if (!olddir || !newdir || !obj) {
+		yaffsfs_SetError(-ENOENT);
+		rename_allowed = 0;
+	} else if (obj->my_dev->read_only) {
+		yaffsfs_SetError(-EROFS);
+		rename_allowed = 0;
+	} else if (rename_file_over_dir(obj, newobj)) {
+		yaffsfs_SetError(-EISDIR);
+		rename_allowed = 0;
+	} else if (rename_dir_over_file(obj, newobj)) {
+		yaffsfs_SetError(-ENOTDIR);
+		rename_allowed = 0;
+	} else if (yaffs_is_non_empty_dir(newobj)) {
+		yaffsfs_SetError(-ENOTEMPTY);
+		rename_allowed = 0;
+	} else if (olddir->my_dev != newdir->my_dev) {
+		/* Rename must be on same device */
+		yaffsfs_SetError(-EXDEV);
+		rename_allowed = 0;
+	} else if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+		/*
+		 * It is a directory, check that it is not being renamed to
+		 * being its own decendent.
+		 * Do this by tracing from the new directory back to the root,
+		 * checking for obj
+		 */
+
+		struct yaffs_obj *xx = newdir;
+
+		while (rename_allowed && xx) {
+			if (xx == obj)
+				rename_allowed = 0;
+			xx = xx->parent;
+		}
+		if (!rename_allowed)
+			yaffsfs_SetError(-EINVAL);
+	}
+
+	if (rename_allowed)
+		result = yaffs_rename_obj(olddir, oldname, newdir, newname);
+
+	yaffsfs_Unlock();
+
+	kfree(alt_newpath);
+
+	return (result == YAFFS_FAIL) ? -1 : 0;
+}
+
+int yaffs_rename_reldev(struct yaffs_dev *dev, const YCHAR *oldPath,
+			const YCHAR *newPath)
+{
+	return yaffs_rename_reldir(ROOT_DIR(dev), oldPath, newPath);
+}
+int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
+{
+	return yaffs_rename_reldir(NULL, oldPath, newPath);
+}
+
+static int yaffsfs_DoStat(struct yaffs_obj *obj, struct yaffs_stat *buf)
+{
+	int retVal = -1;
+
+	obj = yaffs_get_equivalent_obj(obj);
+
+	if (obj && buf) {
+		buf->st_dev = (int)obj->my_dev->os_context;
+		buf->st_ino = obj->obj_id;
+		buf->st_mode = obj->yst_mode & ~S_IFMT;
+
+		if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+			buf->st_mode |= S_IFDIR;
+		else if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+			buf->st_mode |= S_IFLNK;
+		else if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+			buf->st_mode |= S_IFREG;
+
+		buf->st_nlink = yaffs_get_obj_link_count(obj);
+		buf->st_uid = 0;
+		buf->st_gid = 0;
+		buf->st_rdev = obj->yst_rdev;
+		buf->st_size = yaffs_get_obj_length(obj);
+		buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
+		buf->st_blocks = (buf->st_size + buf->st_blksize - 1) /
+		    buf->st_blksize;
+#if CONFIG_YAFFS_WINCE
+		buf->yst_wince_atime[0] = obj->win_atime[0];
+		buf->yst_wince_atime[1] = obj->win_atime[1];
+		buf->yst_wince_ctime[0] = obj->win_ctime[0];
+		buf->yst_wince_ctime[1] = obj->win_ctime[1];
+		buf->yst_wince_mtime[0] = obj->win_mtime[0];
+		buf->yst_wince_mtime[1] = obj->win_mtime[1];
+#else
+		buf->yst_atime = obj->yst_atime;
+		buf->yst_ctime = obj->yst_ctime;
+		buf->yst_mtime = obj->yst_mtime;
+#endif
+		retVal = 0;
+	}
+	return retVal;
+}
+
+static int yaffsfs_DoStatOrLStat_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+				 struct yaffs_stat *buf, int doLStat)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(buf, sizeof(*buf), 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+
+	if (!doLStat && obj)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else
+		retVal = yaffsfs_DoStat(obj, buf);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_stat_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+		    struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat_reldir(reldir, path, buf, 0);
+}
+
+int yaffs_lstat_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+		    struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat_reldir(reldir, path, buf, 1);
+}
+
+int yaffs_stat_reldev(struct yaffs_dev *dev, const YCHAR *path,
+		    struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat_reldir(ROOT_DIR(dev), path, buf, 0);
+}
+
+int yaffs_lstat_reldev(struct yaffs_dev *dev, const YCHAR *path,
+		    struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat_reldir(ROOT_DIR(dev), path, buf, 1);
+}
+
+int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
+{
+	return yaffs_stat_reldir(NULL, path, buf);
+}
+
+int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
+{
+	return yaffs_lstat_reldir(NULL, path, buf);
+}
+
+int yaffs_fstat(int fd, struct yaffs_stat *buf)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(buf, sizeof(*buf), 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj)
+		retVal = yaffsfs_DoStat(obj, buf);
+	else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffsfs_DoUtime(struct yaffs_obj *obj,
+			   const struct yaffs_utimbuf *buf)
+{
+	int retVal = -1;
+	struct yaffs_utimbuf local;
+
+	obj = yaffs_get_equivalent_obj(obj);
+
+	if (obj && obj->my_dev->read_only) {
+		yaffsfs_SetError(-EROFS);
+		return -1;
+	}
+
+#if !CONFIG_YAFFS_WINCE
+	if (!buf) {
+		local.actime = Y_CURRENT_TIME;
+		local.modtime = local.actime;
+		buf = &local;
+	}
+
+	if (obj) {
+		int result;
+
+		obj->yst_atime = buf->actime;
+		obj->yst_mtime = buf->modtime;
+		obj->dirty = 1;
+		result = yaffs_flush_file(obj, 0, 0, 0);
+		retVal = result == YAFFS_OK ? 0 : -1;
+	}
+#endif
+
+	return retVal;
+}
+
+int yaffs_utime_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+		     const struct yaffs_utimbuf *buf)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (!path) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else
+		retVal = yaffsfs_DoUtime(obj, buf);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_utime_reldev(struct yaffs_dev *dev, const YCHAR *path,
+			const struct yaffs_utimbuf *buf)
+{
+	return yaffs_utime_reldir(ROOT_DIR(dev), path, buf);
+}
+
+int yaffs_utime(const YCHAR *path, const struct yaffs_utimbuf *buf)
+{
+	return yaffs_utime_reldir(NULL, path, buf);
+}
+
+int yaffs_futime(int fd, const struct yaffs_utimbuf *buf)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj)
+		retVal = yaffsfs_DoUtime(obj, buf);
+	else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+#ifndef CONFIG_YAFFS_WINCE
+/* xattrib functions */
+
+static int yaffs_do_setxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+				  const char *name, const void *data, int size,
+				  int flags, int follow)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_obj *dir;
+	int notDir = 0;
+	int loop = 0;
+
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(name, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(data, size, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_set_xattrib(obj, name, data, size, flags);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_setxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, const void *data, int size, int flags)
+{
+	return yaffs_do_setxattr_reldir(reldir, path, name, data, size, flags, 1);
+}
+
+int yaffs_setxattr_reldev(struct yaffs_dev *dev, const YCHAR *path,
+		const char *name, const void *data, int size, int flags)
+{
+	return yaffs_setxattr_reldir(ROOT_DIR(dev), path, name, data, size, flags);
+}
+
+int yaffs_setxattr(const YCHAR *path, const char *name,
+		   const void *data, int size, int flags)
+{
+	return yaffs_setxattr_reldir(NULL, path, name, data, size, flags);
+}
+
+int yaffs_lsetxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path, const char *name,
+		    const void *data, int size, int flags)
+{
+	return yaffs_do_setxattr_reldir(reldir, path, name, data, size, flags, 0);
+}
+
+int yaffs_lsetxattr_reldev(struct yaffs_dev *dev, const YCHAR *path, const char *name,
+		   const void *data, int size, int flags)
+{
+	return yaffs_lsetxattr_reldir(ROOT_DIR(dev), path, name, data, size, flags);
+}
+
+int yaffs_lsetxattr(const YCHAR *path, const char *name,
+		   const void *data, int size, int flags)
+{
+	return yaffs_lsetxattr_reldir(NULL, path, name, data, size, flags);
+}
+
+int yaffs_fsetxattr(int fd, const char *name,
+		    const void *data, int size, int flags)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(name, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(data, size, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (!obj)
+		yaffsfs_SetError(-EBADF);
+	else {
+		retVal = yaffs_set_xattrib(obj, name, data, size, flags);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffs_do_getxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, void *data, int size, int follow)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_obj *dir;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(name, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(data, size, 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_get_xattrib(obj, name, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	}
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_getxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, void *data, int size)
+{
+	return yaffs_do_getxattr_reldir(reldir, path, name, data, size, 1);
+}
+
+int yaffs_getxattr_reldev(struct yaffs_dev *dev, const YCHAR *path, const char *name, void *data, int size)
+{
+	return yaffs_getxattr_reldir(ROOT_DIR(dev), path, name, data, size);
+}
+
+int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
+{
+	return yaffs_getxattr_reldir(NULL, path, name, data, size);
+}
+
+int yaffs_lgetxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name, void *data, int size)
+{
+	return yaffs_do_getxattr_reldir(reldir, path, name, data, size, 0);
+}
+
+int yaffs_lgetxattr_reldev(struct yaffs_dev *dev, const YCHAR *path, const char *name, void *data, int size)
+{
+	return yaffs_lgetxattr_reldir(ROOT_DIR(dev), path, name, data, size);
+}
+
+int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
+{
+	return yaffs_lgetxattr_reldir(NULL, path, name, data, size);
+}
+
+int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(name, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(data, size, 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
+		retVal = yaffs_get_xattrib(obj, name, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	} else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffs_do_listxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+				char *data, int size, int follow)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(data, size, 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_list_xattrib(obj, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_listxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			char *data, int size)
+{
+	return yaffs_do_listxattr_reldir(reldir, path, data, size, 1);
+}
+
+int yaffs_listxattr_reldev(struct yaffs_dev *dev, const YCHAR *path, char *data, int size)
+{
+	return yaffs_listxattr_reldir(ROOT_DIR(dev), path, data, size);
+}
+
+int yaffs_listxattr(const YCHAR *path, char *data, int size)
+{
+	return yaffs_listxattr_reldir(NULL, path, data, size);
+}
+
+int yaffs_llistxattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			char *data, int size)
+{
+	return yaffs_do_listxattr_reldir(reldir, path, data, size, 0);
+}
+
+int yaffs_llistxattr_reldev(struct yaffs_dev *dev, const YCHAR *path, char *data, int size)
+{
+	return yaffs_llistxattr_reldir(ROOT_DIR(dev), path, data, size);
+}
+
+int yaffs_llistxattr(const YCHAR *path, char *data, int size)
+{
+	return yaffs_llistxattr_reldir(NULL, path, data, size);
+}
+
+int yaffs_flistxattr(int fd, char *data, int size)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(data, size, 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
+		retVal = yaffs_list_xattrib(obj, data, size);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	} else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+static int yaffs_do_removexattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+				const char *name, int follow)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int notDir = 0;
+	int loop = 0;
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(name, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+
+	if (follow)
+		obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else {
+		retVal = yaffs_remove_xattrib(obj, name);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_removexattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name)
+{
+	return yaffs_do_removexattr_reldir(reldir, path, name, 1);
+}
+
+int yaffs_removexattr_reldev(struct yaffs_dev *dev, const YCHAR *path, const char *name)
+{
+	return yaffs_removexattr_reldir(ROOT_DIR(dev), path, name);
+}
+
+int yaffs_removexattr(const YCHAR *path, const char *name)
+{
+	return yaffs_removexattr_reldir(NULL, path, name);
+}
+
+int yaffs_lremovexattr_reldir(struct yaffs_obj *reldir, const YCHAR *path,
+			const char *name)
+{
+	return yaffs_do_removexattr_reldir(reldir, path, name, 0);
+}
+
+int yaffs_lremovexattr_reldev(struct yaffs_dev *dev, const YCHAR *path, const char *name)
+{
+	return yaffs_lremovexattr_reldir(ROOT_DIR(dev), path, name);
+}
+
+int yaffs_lremovexattr(const YCHAR *path, const char *name)
+{
+	return yaffs_lremovexattr_reldir(NULL, path, name);
+}
+
+int yaffs_fremovexattr(int fd, const char *name)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(name, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
+		retVal = yaffs_remove_xattrib(obj, name);
+		if (retVal < 0) {
+			yaffsfs_SetError(retVal);
+			retVal = -1;
+		}
+	} else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+#endif
+
+#ifdef CONFIG_YAFFS_WINCE
+int yaffs_get_wince_times(int fd, unsigned *wctime,
+			  unsigned *watime, unsigned *wmtime)
+{
+	struct yaffs_obj *obj;
+
+	int retVal = -1;
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
+
+		if (wctime) {
+			wctime[0] = obj->win_ctime[0];
+			wctime[1] = obj->win_ctime[1];
+		}
+		if (watime) {
+			watime[0] = obj->win_atime[0];
+			watime[1] = obj->win_atime[1];
+		}
+		if (wmtime) {
+			wmtime[0] = obj->win_mtime[0];
+			wmtime[1] = obj->win_mtime[1];
+		}
+
+		retVal = 0;
+	} else
+		/*  bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+int yaffs_set_wince_times(int fd,
+			  const unsigned *wctime,
+			  const unsigned *watime, const unsigned *wmtime)
+{
+	struct yaffs_obj *obj;
+	int result;
+	int retVal = -1;
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (obj) {
+
+		if (wctime) {
+			obj->win_ctime[0] = wctime[0];
+			obj->win_ctime[1] = wctime[1];
+		}
+		if (watime) {
+			obj->win_atime[0] = watime[0];
+			obj->win_atime[1] = watime[1];
+		}
+		if (wmtime) {
+			obj->win_mtime[0] = wmtime[0];
+			obj->win_mtime[1] = wmtime[1];
+		}
+
+		obj->dirty = 1;
+		result = yaffs_flush_file(obj, 0, 0, 0);
+		retVal = 0;
+	} else
+		/* bad handle */
+		yaffsfs_SetError(-EBADF);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+#endif
+
+static int yaffsfs_DoChMod(struct yaffs_obj *obj, mode_t mode)
+{
+	int result = -1;
+
+	if (obj)
+		obj = yaffs_get_equivalent_obj(obj);
+
+	if (obj) {
+		obj->yst_mode = mode;
+		obj->dirty = 1;
+		result = yaffs_flush_file(obj, 0, 0, 0);
+	}
+
+	return result == YAFFS_OK ? 0 : -1;
+}
+
+int yaffs_access_reldir(struct yaffs_obj *reldir, const YCHAR *path, int amode)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int notDir = 0;
+	int loop = 0;
+	int retval = -1;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (amode & ~(R_OK | W_OK | X_OK)) {
+		yaffsfs_SetError(-EINVAL);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+	obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if ((amode & W_OK) && obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else {
+		int access_ok = 1;
+
+		if ((amode & R_OK) && !(obj->yst_mode & S_IREAD))
+			access_ok = 0;
+		if ((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
+			access_ok = 0;
+		if ((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
+			access_ok = 0;
+
+		if (!access_ok)
+			yaffsfs_SetError(-EACCES);
+		else
+			retval = 0;
+	}
+
+	yaffsfs_Unlock();
+
+	return retval;
+
+}
+
+int yaffs_access_reldev(struct yaffs_dev *dev, const YCHAR *path, int amode)
+{
+	return yaffs_access_reldir(ROOT_DIR(dev), path, amode);
+}
+
+int yaffs_access(const YCHAR *path, int amode)
+{
+	return yaffs_access_reldir(NULL, path, amode);
+}
+
+int yaffs_chmod_reldir(struct yaffs_obj *reldir, const YCHAR *path, mode_t mode)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (mode & ~(0777)) {
+		yaffsfs_SetError(-EINVAL);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+	obj = yaffsfs_FollowLink(obj, 0, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else
+		retVal = yaffsfs_DoChMod(obj, mode);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+
+int yaffs_chmod_reldev(struct yaffs_dev *dev, const YCHAR *path, mode_t mode)
+{
+	return yaffs_chmod_reldir(ROOT_DIR(dev), path, mode);
+}
+
+int yaffs_chmod(const YCHAR *path, mode_t mode)
+{
+	return yaffs_chmod_reldir(NULL, path, mode);
+}
+
+int yaffs_fchmod(int fd, mode_t mode)
+{
+	struct yaffs_obj *obj;
+	int retVal = -1;
+
+	if (mode & ~(0777)) {
+		yaffsfs_SetError(-EINVAL);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	obj = yaffsfs_HandleToObject(fd);
+
+	if (!obj)
+		yaffsfs_SetError(-EBADF);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else
+		retVal = yaffsfs_DoChMod(obj, mode);
+
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+
+int yaffs_mkdir_reldir(struct yaffs_obj *reldir, const YCHAR *path, mode_t mode)
+{
+	struct yaffs_obj *parent = NULL;
+	struct yaffs_obj *dir = NULL;
+	YCHAR *name;
+	YCHAR *alt_path = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
+		yaffsfs_SetError(-ENOMEM);
+		return -1;
+	}
+	if (alt_path)
+		path = alt_path;
+
+	yaffsfs_Lock();
+	parent = yaffsfs_FindDirectory(reldir, path, &name, 0, &notDir, &loop);
+	if (!parent && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!parent)
+		yaffsfs_SetError(-ENOENT);
+	else if (yaffsfs_TooManyObjects(parent->my_dev))
+		yaffsfs_SetError(-ENFILE);
+	else if (yaffs_strnlen(name, 5) == 0) {
+		/* Trying to make the root itself */
+		yaffsfs_SetError(-EEXIST);
+	} else if (parent->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else {
+		dir = yaffs_create_dir(parent, name, mode, 0, 0);
+		if (dir)
+			retVal = 0;
+		else if (yaffs_find_by_name(parent, name))
+			yaffsfs_SetError(-EEXIST);	/* name exists */
+		else
+			yaffsfs_SetError(-ENOSPC);	/* assume no space */
+	}
+
+	yaffsfs_Unlock();
+
+	kfree(alt_path);
+
+	return retVal;
+}
+
+int yaffs_mkdir_reldev(struct yaffs_dev *dev, const YCHAR *path, mode_t mode)
+{
+	return yaffs_mkdir_reldir(ROOT_DIR(dev), path, mode);
+}
+
+int yaffs_mkdir(const YCHAR *path, mode_t mode)
+{
+	return yaffs_mkdir_reldir(NULL, path, mode);
+}
+
+int yaffs_rmdir_reldir(struct yaffs_obj *reldir, const YCHAR *path)
+{
+	int result;
+	YCHAR *alt_path;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
+		yaffsfs_SetError(-ENOMEM);
+		return -1;
+	}
+	if (alt_path)
+		path = alt_path;
+	result = yaffsfs_DoUnlink_reldir(reldir, path, 1);
+
+	kfree(alt_path);
+
+	return result;
+}
+
+int yaffs_rmdir_reldev(struct yaffs_dev *dev, const YCHAR *path)
+{
+	return yaffs_rmdir_reldir(ROOT_DIR(dev), path);
+}
+
+int yaffs_rmdir(const YCHAR *path)
+{
+	return yaffs_rmdir_reldir(NULL, path);
+}
+
+/*
+ * The mount/unmount/sync functions act on devices rather than reldirs.
+ */
+void *yaffs_getdev(const YCHAR *path)
+{
+	struct yaffs_dev *dev = NULL;
+	YCHAR *dummy;
+	dev = yaffsfs_FindDevice(path, &dummy);
+	return (void *)dev;
+}
+
+int yaffs_mount_common(struct yaffs_dev *dev, const YCHAR *path,
+				int read_only, int skip_checkpt)
+{
+	int retVal = -1;
+	int result = YAFFS_FAIL;
+
+	if (!dev) {
+		if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+			yaffsfs_SetError(-EFAULT);
+			return -1;
+		}
+
+		yaffs_trace(YAFFS_TRACE_MOUNT, "yaffs: Mounting %s", path);
+
+		if (yaffsfs_CheckPath(path) < 0) {
+			yaffsfs_SetError(-ENAMETOOLONG);
+			return -1;
+		}
+	}
+
+	yaffsfs_Lock();
+
+	yaffsfs_InitHandles();
+
+	if (!dev)
+		dev = yaffsfs_FindMountPoint(path);
+
+	if (dev) {
+		if (!dev->is_mounted) {
+			dev->read_only = read_only ? 1 : 0;
+			if (skip_checkpt) {
+				u8 skip = dev->param.skip_checkpt_rd;
+				dev->param.skip_checkpt_rd = 1;
+				result = yaffs_guts_initialise(dev);
+				dev->param.skip_checkpt_rd = skip;
+			} else {
+				result = yaffs_guts_initialise(dev);
+			}
+
+			if (result == YAFFS_FAIL)
+				yaffsfs_SetError(-ENOMEM);
+			retVal = result ? 0 : -1;
+
+		} else
+			yaffsfs_SetError(-EBUSY);
+	} else
+		yaffsfs_SetError(-ENODEV);
+
+	yaffsfs_Unlock();
+	return retVal;
+
+}
+
+int yaffs_mount3_reldev(struct yaffs_dev *dev, int read_only, int skip_checkpt)
+{
+	return yaffs_mount_common(dev, NULL, read_only, skip_checkpt);
+}
+
+int yaffs_mount3(const YCHAR *path, int read_only, int skip_checkpt)
+{
+	return yaffs_mount_common(NULL, path, read_only, skip_checkpt);
+}
+
+int yaffs_mount2_reldev(struct yaffs_dev *dev, int readonly)
+{
+	return yaffs_mount_common(dev, NULL, readonly, 0);
+}
+
+int yaffs_mount2(const YCHAR *path, int readonly)
+{
+	return yaffs_mount_common(NULL, path, readonly, 0);
+}
+
+int yaffs_mount_reldev(struct yaffs_dev *dev)
+{
+	return yaffs_mount_common(dev, NULL, 0, 0);
+}
+
+int yaffs_mount(const YCHAR *path)
+{
+	return yaffs_mount_common(NULL, path, 0, 0);
+}
+
+int yaffs_sync_common(struct yaffs_dev *dev, const YCHAR *path)
+{
+	int retVal = -1;
+	YCHAR *dummy;
+
+	if (!dev) {
+		if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+			yaffsfs_SetError(-EFAULT);
+			return -1;
+		}
+
+		if (yaffsfs_CheckPath(path) < 0) {
+			yaffsfs_SetError(-ENAMETOOLONG);
+			return -1;
+		}
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindDevice(path, &dummy);
+
+	if (dev) {
+		if (!dev->is_mounted)
+			yaffsfs_SetError(-EINVAL);
+		else if (dev->read_only)
+			yaffsfs_SetError(-EROFS);
+		else {
+
+			yaffs_flush_whole_cache(dev, 0);
+			yaffs_checkpoint_save(dev);
+			retVal = 0;
+
+		}
+	} else
+		yaffsfs_SetError(-ENODEV);
+
+	yaffsfs_Unlock();
+	return retVal;
+}
+
+int yaffs_sync_reldev(struct yaffs_dev *dev)
+{
+	return yaffs_sync_common(dev, NULL);
+}
+
+int yaffs_sync(const YCHAR *path)
+{
+	return yaffs_sync_common(NULL, path);
+}
+
+
+static int yaffsfs_bg_gc_common(struct yaffs_dev *dev,
+				const YCHAR *path,
+				int urgency)
+{
+	int retVal = -1;
+	YCHAR *dummy;
+
+	if (!dev) {
+		if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+			yaffsfs_SetError(-EFAULT);
+			return -1;
+		}
+
+		if (yaffsfs_CheckPath(path) < 0) {
+			yaffsfs_SetError(-ENAMETOOLONG);
+			return -1;
+		}
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindDevice(path, &dummy);
+
+	if (dev) {
+		if (!dev->is_mounted)
+			yaffsfs_SetError(-EINVAL);
+		else
+			retVal = yaffs_bg_gc(dev, urgency);
+	} else
+		yaffsfs_SetError(-ENODEV);
+
+	yaffsfs_Unlock();
+	return retVal;
+}
+
+/* Background gc functions.
+ * These return 0 when bg done or greater than 0 when gc has been
+ * done and there is still a lot of garbage to be cleaned up.
+ */
+
+int yaffs_do_background_gc(const YCHAR *path, int urgency)
+{
+	return yaffsfs_bg_gc_common(NULL, path, urgency);
+}
+
+int yaffs_do_background_gc_reldev(struct yaffs_dev *dev, int urgency)
+{
+	return yaffsfs_bg_gc_common(dev, NULL, urgency);
+}
+
+static int yaffsfs_IsDevBusy(struct yaffs_dev *dev)
+{
+	int i;
+	struct yaffs_obj *obj;
+
+	for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
+		obj = yaffsfs_HandleToObject(i);
+		if (obj && obj->my_dev == dev)
+			return 1;
+	}
+	return 0;
+}
+
+int yaffs_remount_common(struct yaffs_dev *dev, const YCHAR *path,
+		       int force, int read_only)
+{
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindMountPoint(path);
+
+	if (dev) {
+		if (dev->is_mounted) {
+			yaffs_flush_whole_cache(dev, 0);
+
+			if (force || !yaffsfs_IsDevBusy(dev)) {
+				if (read_only)
+					yaffs_checkpoint_save(dev);
+				dev->read_only = read_only ? 1 : 0;
+				retVal = 0;
+			} else
+				yaffsfs_SetError(-EBUSY);
+
+		} else
+			yaffsfs_SetError(-EINVAL);
+
+	} else
+		yaffsfs_SetError(-ENODEV);
+
+	yaffsfs_Unlock();
+	return retVal;
+
+}
+
+int yaffs_remount_reldev(struct yaffs_dev *dev, int force, int read_only)
+{
+	return yaffs_remount_common(dev, NULL, force, read_only);
+}
+int yaffs_remount(const YCHAR *path, int force, int read_only)
+{
+	return yaffs_remount_common(NULL, path, force, read_only);
+}
+
+int yaffs_unmount2_common(struct yaffs_dev *dev, const YCHAR *path, int force)
+{
+	int retVal = -1;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindMountPoint(path);
+
+	if (dev) {
+		if (dev->is_mounted) {
+			int inUse;
+			yaffs_flush_whole_cache(dev, 0);
+			yaffs_checkpoint_save(dev);
+			inUse = yaffsfs_IsDevBusy(dev);
+			if (!inUse || force) {
+				if (inUse)
+					yaffsfs_BreakDeviceHandles(dev);
+				yaffs_deinitialise(dev);
+
+				retVal = 0;
+			} else
+				yaffsfs_SetError(-EBUSY);
+
+		} else
+			yaffsfs_SetError(-EINVAL);
+
+	} else
+		yaffsfs_SetError(-ENODEV);
+
+	yaffsfs_Unlock();
+	return retVal;
+
+}
+
+int yaffs_unmount2_reldev(struct yaffs_dev *dev, int force)
+{
+	return yaffs_unmount2_common(dev, NULL, force);
+}
+
+int yaffs_unmount2(const YCHAR *path, int force)
+{
+	return yaffs_unmount2_common(NULL, path, force);
+}
+
+int yaffs_unmount_reldev(struct yaffs_dev *dev)
+{
+	return yaffs_unmount2_reldev(dev, 0);
+}
+
+int yaffs_unmount(const YCHAR *path)
+{
+	return yaffs_unmount2(path, 0);
+}
+
+int yaffs_format_common(struct yaffs_dev *dev,
+		const YCHAR *path,
+		int unmount_flag,
+		int force_unmount_flag,
+		int remount_flag)
+{
+	int retVal = 0;
+	int result;
+
+	if (!dev) {
+		if (!path) {
+			yaffsfs_SetError(-EFAULT);
+			return -1;
+		}
+
+		if (yaffsfs_CheckPath(path) < 0) {
+			yaffsfs_SetError(-ENAMETOOLONG);
+			return -1;
+		}
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindMountPoint(path);
+
+	if (dev) {
+		int was_mounted = dev->is_mounted;
+
+		if (dev->is_mounted && unmount_flag) {
+			int inUse;
+			yaffs_flush_whole_cache(dev, 0);
+			yaffs_checkpoint_save(dev);
+			inUse = yaffsfs_IsDevBusy(dev);
+			if (!inUse || force_unmount_flag) {
+				if (inUse)
+					yaffsfs_BreakDeviceHandles(dev);
+				yaffs_deinitialise(dev);
+			}
+		}
+
+		if(dev->is_mounted) {
+				yaffsfs_SetError(-EBUSY);
+				retVal = -1;
+		} else {
+			yaffs_guts_format_dev(dev);
+			if(was_mounted && remount_flag) {
+				result = yaffs_guts_initialise(dev);
+				if (result == YAFFS_FAIL) {
+					yaffsfs_SetError(-ENOMEM);
+					retVal = -1;
+				}
+			}
+		}
+	} else {
+		yaffsfs_SetError(-ENODEV);
+		retVal = -1;
+	}
+
+	yaffsfs_Unlock();
+	return retVal;
+
+}
+
+int yaffs_format_reldev(struct yaffs_dev *dev,
+		int unmount_flag,
+		int force_unmount_flag,
+		int remount_flag)
+{
+	return yaffs_format_common(dev, NULL, unmount_flag,
+			force_unmount_flag, remount_flag);
+}
+
+int yaffs_format(const YCHAR *path,
+		int unmount_flag,
+		int force_unmount_flag,
+		int remount_flag)
+{
+	return yaffs_format_common(NULL, path, unmount_flag,
+			force_unmount_flag, remount_flag);
+}
+
+Y_LOFF_T yaffs_freespace_common(struct yaffs_dev *dev, const YCHAR *path)
+{
+	Y_LOFF_T retVal = -1;
+	YCHAR *dummy;
+
+	if (!dev) {
+		if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+			yaffsfs_SetError(-EFAULT);
+			return -1;
+		}
+
+		if (yaffsfs_CheckPath(path) < 0) {
+			yaffsfs_SetError(-ENAMETOOLONG);
+			return -1;
+		}
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindDevice(path, &dummy);
+	if (dev && dev->is_mounted) {
+		retVal = yaffs_get_n_free_chunks(dev);
+		retVal *= dev->data_bytes_per_chunk;
+
+	} else
+		yaffsfs_SetError(-EINVAL);
+
+	yaffsfs_Unlock();
+	return retVal;
+}
+
+Y_LOFF_T yaffs_freespace_reldev(struct yaffs_dev *dev)
+{
+	return yaffs_freespace_common(dev, NULL);
+}
+
+Y_LOFF_T yaffs_freespace(const YCHAR *path)
+{
+	return yaffs_freespace_common(NULL, path);
+}
+
+Y_LOFF_T yaffs_totalspace_common(struct yaffs_dev *dev, const YCHAR *path)
+{
+	Y_LOFF_T retVal = -1;
+	YCHAR *dummy;
+
+	if (!dev) {
+		if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+			yaffsfs_SetError(-EFAULT);
+			return -1;
+		}
+
+		if (yaffsfs_CheckPath(path) < 0) {
+			yaffsfs_SetError(-ENAMETOOLONG);
+			return -1;
+		}
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindDevice(path, &dummy);
+	if (dev && dev->is_mounted) {
+		retVal = (dev->param.end_block - dev->param.start_block + 1) -
+		    dev->param.n_reserved_blocks;
+		retVal *= dev->param.chunks_per_block;
+		retVal *= dev->data_bytes_per_chunk;
+
+	} else
+		yaffsfs_SetError(-EINVAL);
+
+	yaffsfs_Unlock();
+	return retVal;
+}
+
+Y_LOFF_T yaffs_totalspace_reldev(struct yaffs_dev *dev)
+{
+	return yaffs_totalspace_common(dev, NULL);
+}
+
+Y_LOFF_T yaffs_totalspace(const YCHAR *path)
+{
+	return yaffs_totalspace_common(NULL, path);
+}
+
+int yaffs_inodecount_common(struct yaffs_dev *dev, const YCHAR *path)
+{
+	Y_LOFF_T retVal = -1;
+	YCHAR *dummy;
+
+	if (!dev) {
+		if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+			yaffsfs_SetError(-EFAULT);
+			return -1;
+		}
+
+		if (yaffsfs_CheckPath(path) < 0) {
+			yaffsfs_SetError(-ENAMETOOLONG);
+			return -1;
+		}
+	}
+
+	yaffsfs_Lock();
+	if (!dev)
+		dev = yaffsfs_FindDevice(path, &dummy);
+	if (dev && dev->is_mounted) {
+		int n_obj = dev->n_obj;
+		if (n_obj > dev->n_hardlinks)
+			retVal = n_obj - dev->n_hardlinks;
+	}
+
+	if (retVal < 0)
+		yaffsfs_SetError(-EINVAL);
+
+	yaffsfs_Unlock();
+	return retVal;
+}
+
+int yaffs_inodecount_reldev(struct yaffs_dev *dev)
+{
+	return yaffs_inodecount_common(dev, NULL);
+}
+
+int yaffs_inodecount(const YCHAR *path)
+{
+	return yaffs_inodecount_common(NULL, path);
+}
+
+void yaffs_add_device(struct yaffs_dev *dev)
+{
+	struct list_head *cfg;
+	/* First check that the device is not in the list. */
+
+	list_for_each(cfg, &yaffsfs_deviceList) {
+		if (dev == list_entry(cfg, struct yaffs_dev, dev_list))
+			return;
+	}
+
+	dev->is_mounted = 0;
+	dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
+
+	if (!dev->dev_list.next)
+		INIT_LIST_HEAD(&dev->dev_list);
+
+	list_add(&dev->dev_list, &yaffsfs_deviceList);
+
+
+}
+
+void yaffs_remove_device(struct yaffs_dev *dev)
+{
+	list_del_init(&dev->dev_list);
+}
+
+/* Functions to iterate through devices. NB Use with extreme care! */
+
+static struct list_head *dev_iterator;
+void yaffs_dev_rewind(void)
+{
+	dev_iterator = yaffsfs_deviceList.next;
+}
+
+struct yaffs_dev *yaffs_next_dev(void)
+{
+	struct yaffs_dev *retval;
+
+	if (!dev_iterator)
+		return NULL;
+	if (dev_iterator == &yaffsfs_deviceList)
+		return NULL;
+
+	retval = list_entry(dev_iterator, struct yaffs_dev, dev_list);
+	dev_iterator = dev_iterator->next;
+	return retval;
+}
+
+/* Directory search stuff. */
+
+static struct list_head search_contexts;
+
+static void yaffsfs_SetDirRewound(struct yaffsfs_DirSearchContext *dsc)
+{
+	if (dsc &&
+	    dsc->dirObj &&
+	    dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+
+		dsc->offset = 0;
+
+		if (list_empty(&dsc->dirObj->variant.dir_variant.children))
+			dsc->nextReturn = NULL;
+		else
+			dsc->nextReturn =
+			    list_entry(dsc->dirObj->variant.dir_variant.
+				       children.next, struct yaffs_obj,
+				       siblings);
+	} else {
+		/* Hey someone isn't playing nice! */
+	}
+}
+
+static void yaffsfs_DirAdvance(struct yaffsfs_DirSearchContext *dsc)
+{
+	if (dsc &&
+	    dsc->dirObj &&
+	    dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+
+		if (dsc->nextReturn == NULL ||
+		    list_empty(&dsc->dirObj->variant.dir_variant.children))
+			dsc->nextReturn = NULL;
+		else {
+			struct list_head *next = dsc->nextReturn->siblings.next;
+
+			if (next == &dsc->dirObj->variant.dir_variant.children)
+				dsc->nextReturn = NULL;	/* end of list */
+			else
+				dsc->nextReturn = list_entry(next,
+							     struct yaffs_obj,
+							     siblings);
+		}
+	} else {
+		/* Hey someone isn't playing nice! */
+	}
+}
+
+static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
+{
+
+	struct list_head *i;
+	struct yaffsfs_DirSearchContext *dsc;
+
+	/* if search contexts not initilised then skip */
+	if (!search_contexts.next)
+		return;
+
+	/* Iterate through the directory search contexts.
+	 * If any are the one being removed, then advance the dsc to
+	 * the next one to prevent a hanging ptr.
+	 */
+	list_for_each(i, &search_contexts) {
+		if (i) {
+			dsc = list_entry(i, struct yaffsfs_DirSearchContext,
+					 others);
+			if (dsc->nextReturn == obj)
+				yaffsfs_DirAdvance(dsc);
+		}
+	}
+
+}
+
+static yaffs_DIR *yaffsfs_opendir_reldir_no_lock(struct yaffs_obj *reldir,
+					const YCHAR *dirname)
+{
+	yaffs_DIR *dir = NULL;
+	struct yaffs_obj *obj = NULL;
+	struct yaffsfs_DirSearchContext *dsc = NULL;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(dirname, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return NULL;
+	}
+
+	if (yaffsfs_CheckPath(dirname) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return NULL;
+	}
+
+	obj = yaffsfs_FindObject(reldir, dirname, 0, 1, NULL, &notDir, &loop);
+
+	if (!obj && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		yaffsfs_SetError(-ENOTDIR);
+	else {
+		int i;
+
+		for (i = 0, dsc = NULL; i < YAFFSFS_N_DSC && !dsc; i++) {
+			if (!yaffsfs_dsc[i].inUse)
+				dsc = &yaffsfs_dsc[i];
+		}
+
+		dir = (yaffs_DIR *) dsc;
+
+		if (dsc) {
+			memset(dsc, 0, sizeof(struct yaffsfs_DirSearchContext));
+			dsc->inUse = 1;
+			dsc->dirObj = obj;
+			yaffs_strncpy(dsc->name, dirname, NAME_MAX);
+			INIT_LIST_HEAD(&dsc->others);
+
+			if (!search_contexts.next)
+				INIT_LIST_HEAD(&search_contexts);
+
+			list_add(&dsc->others, &search_contexts);
+			yaffsfs_SetDirRewound(dsc);
+		}
+	}
+	return dir;
+}
+
+yaffs_DIR *yaffs_opendir_reldir(struct yaffs_obj *reldir, const YCHAR *dirname)
+{
+	yaffs_DIR *ret;
+
+	yaffsfs_Lock();
+	ret = yaffsfs_opendir_reldir_no_lock(reldir, dirname);
+	yaffsfs_Unlock();
+	return ret;
+}
+
+yaffs_DIR *yaffs_opendir_reldev(struct yaffs_dev *dev, const YCHAR *dirname)
+{
+	return yaffs_opendir_reldir(ROOT_DIR(dev), dirname);
+}
+
+yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
+{
+	return yaffs_opendir_reldir(NULL, dirname);
+}
+
+struct yaffs_dirent *yaffsfs_readdir_no_lock(yaffs_DIR * dirp)
+{
+	struct yaffsfs_DirSearchContext *dsc;
+	struct yaffs_dirent *retVal = NULL;
+
+	dsc = (struct yaffsfs_DirSearchContext *) dirp;
+
+
+	if (dsc && dsc->inUse) {
+		yaffsfs_SetError(0);
+		if (dsc->nextReturn) {
+			dsc->de.d_ino =
+			    yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id;
+			dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
+			dsc->de.d_off = dsc->offset++;
+			yaffs_get_obj_name(dsc->nextReturn,
+					   dsc->de.d_name, NAME_MAX);
+			if (yaffs_strnlen(dsc->de.d_name, NAME_MAX + 1) == 0) {
+				/* this should not happen! */
+				yaffs_strcpy(dsc->de.d_name, _Y("zz"));
+			}
+			dsc->de.d_reclen = sizeof(struct yaffs_dirent);
+			retVal = &dsc->de;
+			yaffsfs_DirAdvance(dsc);
+		} else
+			retVal = NULL;
+	} else
+		yaffsfs_SetError(-EBADF);
+
+	return retVal;
+
+}
+struct yaffs_dirent *yaffs_readdir(yaffs_DIR * dirp)
+{
+	struct yaffs_dirent *ret;
+
+	yaffsfs_Lock();
+	ret = yaffsfs_readdir_no_lock(dirp);
+	yaffsfs_Unlock();
+	return ret;
+}
+
+static void yaffsfs_rewinddir_no_lock(yaffs_DIR *dirp)
+{
+	struct yaffsfs_DirSearchContext *dsc;
+
+	dsc = (struct yaffsfs_DirSearchContext *) dirp;
+
+	if (yaffsfs_CheckMemRegion(dirp, sizeof(*dsc), 0) < 0)
+		return;
+
+	yaffsfs_SetDirRewound(dsc);
+
+}
+
+void yaffs_rewinddir(yaffs_DIR *dirp)
+{
+	yaffsfs_Lock();
+	yaffsfs_rewinddir_no_lock(dirp);
+	yaffsfs_Unlock();
+}
+
+struct yaffs_dirent *yaffs_readdir_fd(int fd)
+{
+	struct yaffs_dirent *ret = NULL;
+	struct yaffsfs_FileDes *f;
+
+	yaffsfs_Lock();
+	f = yaffsfs_HandleToFileDes(fd);
+	if(f && f->isDir)
+		ret = yaffsfs_readdir_no_lock(f->v.dir);
+	yaffsfs_Unlock();
+	return ret;
+}
+
+void yaffs_rewinddir_fd(int fd)
+{
+	struct yaffsfs_FileDes *f;
+
+	yaffsfs_Lock();
+	f = yaffsfs_HandleToFileDes(fd);
+	if(f && f->isDir)
+		yaffsfs_rewinddir_no_lock(f->v.dir);
+	yaffsfs_Unlock();
+}
+
+
+static int yaffsfs_closedir_no_lock(yaffs_DIR *dirp)
+{
+	struct yaffsfs_DirSearchContext *dsc;
+
+	dsc = (struct yaffsfs_DirSearchContext *) dirp;
+
+	if (yaffsfs_CheckMemRegion(dirp, sizeof(*dsc), 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	dsc->inUse = 0;
+	list_del(&dsc->others);	/* unhook from list */
+
+	return 0;
+}
+int yaffs_closedir(yaffs_DIR *dirp)
+{
+	int ret;
+
+	yaffsfs_Lock();
+	ret = yaffsfs_closedir_no_lock(dirp);
+	yaffsfs_Unlock();
+	return ret;
+}
+
+/* End of directory stuff */
+
+int yaffs_symlink_reldir(struct yaffs_obj *reldir,
+		       const YCHAR *oldpath, const YCHAR *newpath)
+{
+	struct yaffs_obj *parent = NULL;
+	struct yaffs_obj *obj;
+	YCHAR *name;
+	int retVal = -1;
+	int mode = 0;		/* ignore for now */
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(oldpath, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(newpath, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(newpath) < 0 || yaffsfs_CheckPath(oldpath) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+	parent = yaffsfs_FindDirectory(reldir, newpath, &name, 0, &notDir, &loop);
+	if (!parent && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!parent || yaffs_strnlen(name, 5) < 1)
+		yaffsfs_SetError(-ENOENT);
+	else if (yaffsfs_TooManyObjects(parent->my_dev))
+		yaffsfs_SetError(-ENFILE);
+	else if (parent->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (parent) {
+		obj = yaffs_create_symlink(parent, name, mode, 0, 0, oldpath);
+		if (obj)
+			retVal = 0;
+		else if (yaffsfs_FindObject(reldir, newpath, 0, 0,
+						NULL, NULL, NULL))
+			yaffsfs_SetError(-EEXIST);
+		else
+			yaffsfs_SetError(-ENOSPC);
+	}
+
+	yaffsfs_Unlock();
+
+	return retVal;
+
+}
+int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
+{
+	return yaffs_symlink_reldir(NULL, oldpath, newpath);
+}
+
+int yaffs_readlink_reldir(struct yaffs_obj *reldir,const YCHAR *path,
+			YCHAR *buf, int bufsiz)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *dir = NULL;
+	int retVal = -1;
+	int notDir = 0;
+	int loop = 0;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(buf, bufsiz, 1) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, &dir, &notDir, &loop);
+
+	if (!dir && notDir)
+		yaffsfs_SetError(-ENOTDIR);
+	else if (loop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK)
+		yaffsfs_SetError(-EINVAL);
+	else {
+		YCHAR *alias = obj->variant.symlink_variant.alias;
+		memset(buf, 0, bufsiz);
+		yaffs_strncpy(buf, alias, bufsiz - 1);
+		retVal = 0;
+	}
+	yaffsfs_Unlock();
+	return retVal;
+}
+int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
+{
+	return yaffs_readlink_reldir(NULL, path, buf, bufsiz);
+}
+
+int yaffs_link_reldir(struct yaffs_obj *reldir,
+			const YCHAR *oldpath, const YCHAR *linkpath)
+{
+	/* Creates a link called newpath to existing oldpath */
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *lnk = NULL;
+	struct yaffs_obj *obj_dir = NULL;
+	struct yaffs_obj *lnk_dir = NULL;
+	int retVal = -1;
+	int notDirObj = 0;
+	int notDirLnk = 0;
+	int objLoop = 0;
+	int lnkLoop = 0;
+	YCHAR *newname;
+
+	if (yaffsfs_CheckMemRegion(oldpath, 0, 0) < 0 ||
+	    yaffsfs_CheckMemRegion(linkpath, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(linkpath) < 0 || yaffsfs_CheckPath(oldpath) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(reldir, oldpath, 0, 1,
+				 &obj_dir, &notDirObj, &objLoop);
+	lnk = yaffsfs_FindObject(reldir, linkpath, 0, 0, NULL, NULL, NULL);
+	lnk_dir = yaffsfs_FindDirectory(reldir, linkpath, &newname,
+					0, &notDirLnk, &lnkLoop);
+
+	if ((!obj_dir && notDirObj) || (!lnk_dir && notDirLnk))
+		yaffsfs_SetError(-ENOTDIR);
+	else if (objLoop || lnkLoop)
+		yaffsfs_SetError(-ELOOP);
+	else if (!obj_dir || !lnk_dir || !obj)
+		yaffsfs_SetError(-ENOENT);
+	else if (obj->my_dev->read_only)
+		yaffsfs_SetError(-EROFS);
+	else if (yaffsfs_TooManyObjects(obj->my_dev))
+		yaffsfs_SetError(-ENFILE);
+	else if (lnk)
+		yaffsfs_SetError(-EEXIST);
+	else if (lnk_dir->my_dev != obj->my_dev)
+		yaffsfs_SetError(-EXDEV);
+	else {
+		retVal = yaffsfs_CheckNameLength(newname);
+
+		if (retVal == 0) {
+			lnk = yaffs_link_obj(lnk_dir, newname, obj);
+			if (lnk)
+				retVal = 0;
+			else {
+				yaffsfs_SetError(-ENOSPC);
+				retVal = -1;
+			}
+		}
+	}
+	yaffsfs_Unlock();
+
+	return retVal;
+}
+int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath)
+{
+	return yaffs_link_reldir(NULL, oldpath, linkpath);
+}
+
+int yaffs_mknod_reldir(struct yaffs_obj *reldir, const YCHAR *pathname,
+		     mode_t mode, dev_t dev_val)
+{
+	(void) pathname;
+	(void) mode;
+	(void) dev_val;
+	(void) reldir;
+
+	yaffsfs_SetError(-EINVAL);
+	return -1;
+}
+
+int yaffs_mknod_reldev(struct yaffs_dev *dev, const YCHAR *pathname, mode_t mode, dev_t dev_val)
+{
+	return yaffs_mknod_reldir(ROOT_DIR(dev), pathname, mode, dev_val);
+}
+
+int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev_val)
+{
+	return yaffs_mknod_reldir(NULL, pathname, mode, dev_val);
+}
+
+/*
+ * D E B U G   F U N C T I O N S
+ */
+
+/*
+ * yaffs_n_handles()
+ * Returns number of handles attached to the object
+ */
+int yaffs_n_handles_reldir(struct yaffs_obj *reldir, const YCHAR *path)
+{
+	struct yaffs_obj *obj;
+
+	if (yaffsfs_CheckMemRegion(path, 0, 0) < 0) {
+		yaffsfs_SetError(-EFAULT);
+		return -1;
+	}
+
+	if (yaffsfs_CheckPath(path) < 0) {
+		yaffsfs_SetError(-ENAMETOOLONG);
+		return -1;
+	}
+
+	obj = yaffsfs_FindObject(reldir, path, 0, 1, NULL, NULL, NULL);
+
+	if (obj)
+		return yaffsfs_CountHandles(obj);
+	else
+		return -1;
+}
+
+int yaffs_n_handles(const YCHAR *path)
+{
+	return yaffs_n_handles_reldir(NULL, path);
+}
+
+int yaffs_get_error(void)
+{
+	return yaffsfs_GetLastError();
+}
+
+int yaffs_set_error(int error)
+{
+	yaffsfs_SetError(error);
+	return 0;
+}
+
+int yaffs_dump_dev_reldir(struct yaffs_obj *reldir, const YCHAR *path)
+{
+#if 1
+	(void) path;
+	(void) reldir;
+#else
+	YCHAR *rest;
+
+
+	if (!reldir)
+		reldir = yaffsfs_FindRoot(path, &rest);
+
+	if (reldir) {
+		struct yaffs_dev *dev = reldir->my_dev;
+
+		printf("\n"
+		       "n_page_writes.......... %d\n"
+		       "n_page_reads........... %d\n"
+		       "n_erasures....... %d\n"
+		       "n_gc_copies............ %d\n"
+		       "garbageCollections... %d\n"
+		       "passiveGarbageColl'ns %d\n"
+		       "\n",
+		       dev->n_page_writes,
+		       dev->n_page_reads,
+		       dev->n_erasures,
+		       dev->n_gc_copies,
+		       dev->garbageCollections, dev->passiveGarbageCollections);
+
+	}
+#endif
+	return 0;
+}
+
+int yaffs_dump_dev(const YCHAR *path)
+{
+	return yaffs_dump_dev_reldir(NULL, path);
+}

flight/pios/common/pios_dosfs_logfs.c

@@ -35,6 +35,17 @@ static xSemaphoreHandle mutex = 0;
 
 struct flashfs_logfs_cfg;
 
+/**
+ * glue macros for file IO
+ **/
+#define FILEINFO FILE *
+#define PIOS_FOPEN_READ(filename, file)                 (file = fopen((char *)filename, "r")) == NULL
+#define PIOS_FOPEN_WRITE(filename, file)                (file = fopen((char *)filename, "w")) == NULL
+#define PIOS_FREAD(file, bufferadr, length, resultadr)  (*resultadr = fread((uint8_t *)bufferadr, 1, length, *file)) != length
+#define PIOS_FWRITE(file, bufferadr, length, resultadr) *resultadr = fwrite((uint8_t *)bufferadr, 1, length, *file)
+#define PIOS_FCLOSE(file)                               fclose(file)
+#define PIOS_FUNLINK(file)                              unlink((char *)filename)
+
 
 /**
  * Get an 8 character (plus extension) filename for the object.

flight/pios/common/pios_logfs.c

@@ -0,0 +1,301 @@
+/**
+ ******************************************************************************
+ * @file       pios_logfs.c
+ * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2013.
+ * @addtogroup PIOS PIOS Core hardware abstraction layer
+ * @{
+ * @brief Log Structured Filesystem leverages yaffs
+ *****************************************************************************/
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+#include "pios.h"
+#include "pios_stdio.h"
+#include "pios_trace.h"
+
+#include <openpilot.h>
+
+/**
+ * Get an object file name and device name and path name
+ * @param[in] fs_id flash device id
+ * @param[in] obj The object handle.
+ * @param[in] instId The instance ID
+ * @param[in] file Filename string pointer -- must be 14 bytes long and allocated
+ * @param[in] path string pointer -- must be 26 bytes long and allocated
+ */
+#define OBJECTPATHNAME_LEN 26
+static void getObjectPathAndName(uintptr_t fs_id, uint32_t obj_id, uint16_t obj_inst_id, char *filename)
+{
+    uint32_t prefix = obj_id + (obj_inst_id / 256) * 16; // put upper 8 bit of instance id into object id modification,
+                                                         // skip least sig nibble since that is used for meta object id
+    uint8_t suffix  = obj_inst_id & 0xff;
+
+    snprintf((char *)filename, OBJECTPATHNAME_LEN, "/dev%01u/logfs/%08X.o%02X", (unsigned)fs_id, prefix, suffix);
+}
+
+/**
+ * Get an devicename
+ * @param[in] fs_id flash device id
+ * @param[in] devicename string pointer -- must be 8 bytes long and allocated
+ */
+#define DEVICENAME_LEN 8
+static void getDeviceName(uintptr_t fs_id, char *devicename)
+{
+    snprintf((char *)devicename, DEVICENAME_LEN, "/dev%01u", (unsigned) fs_id);
+}
+
+/**
+ * Get an logfs path
+ * @param[in] fs_id flash device id
+ * @param[in] devicename string pointer -- must be 14 bytes long and allocated
+ */
+#define LOGFSPATH_LEN 14
+static void getLogfsPath(uintptr_t fs_id, char *devicename)
+{
+    snprintf((char *)devicename, LOGFSPATH_LEN, "/dev%01u/logfs", (unsigned)fs_id);
+}
+
+//Simplistic API takes the fs_id and maps to a path /dev0 eg.  not really necessary
+// but allows reuse existing API plus new API in parallel without too much conflict
+
+int32_t PIOS_FLASHFS_Logfs_Destroy(
+	__attribute__((unused)) uintptr_t fs_id)
+{
+    pios_DIR *dp; 
+    struct pios_dirent *ep;
+    char path[LOGFSPATH_LEN];
+    getLogfsPath(fs_id, path);
+
+    pios_trace(PIOS_TRACE_TEST, "PIOS_FLASHFS_Logfs_Destroy");
+
+
+    dp = pios_opendir (path);
+    if (dp != NULL)
+    {
+      while ((ep = pios_readdir(dp))) {
+        pios_unlink (ep->d_name);
+      }
+      (void) pios_closedir (dp);
+    }
+    else
+    {
+      pios_trace(PIOS_TRACE_ERROR, "Couldn't open the directory %s.", path);
+    }
+    return 0;
+}
+
+/**********************************
+ *
+ * Provide a PIOS_FLASHFS_* driver
+ *
+ *********************************/
+#include "pios_flashfs.h" /* API for flash filesystem */
+
+/**
+ * @brief Saves one object instance to the filesystem
+ * @param[in] fs_id The filesystem to use for this action
+ * @param[in] obj UAVObject ID of the object to save
+ * @param[in] obj_inst_id The instance number of the object being saved
+ * @param[in] obj_data Contents of the object being saved
+ * @param[in] obj_size Size of the object being saved
+ * @return 0 if success or error code
+ * @retval -1 if fs_id is not a valid filesystem instance
+ * @retval -2 if failed to start transaction
+ * @retval -3 if failure to delete any previous versions of the object
+ * @retval -4 if filesystem is entirely full and garbage collection won't help
+ * @retval -5 if garbage collection failed
+ * @retval -6 if filesystem is full even after garbage collection should have freed space
+ * @retval -7 if writing the new object to the filesystem failed
+ */
+int32_t PIOS_FLASHFS_ObjSave(
+	__attribute__((unused)) uintptr_t fs_id, 
+	uint32_t obj_id, 
+	uint16_t obj_inst_id, 
+	uint8_t *obj_data, 
+	uint16_t obj_size)
+{
+    int fd;
+    char filename[OBJECTPATHNAME_LEN];
+    uint32_t bytes_written = 0;
+
+    pios_trace(PIOS_TRACE_TEST, "PIOS_FLASHFS_ObjSave");
+
+    // Get filename
+    getObjectPathAndName(fs_id, obj_id, obj_inst_id, filename);
+
+    // Open file
+    fd = pios_open(filename, O_CREAT | O_RDWR | O_TRUNC, S_IREAD | S_IWRITE);
+    pios_trace(PIOS_TRACE_TEST, "pios_open (%s) retval=%d.", filename, fd);
+
+    if (fd < 0) {
+	    pios_trace(PIOS_TRACE_ERROR, "Couldn't open %s", filename);
+    }
+    else {
+        // Append object
+        bytes_written = pios_write(fd, obj_data, obj_size);
+        pios_trace(PIOS_TRACE_TEST, "pios_write bytes_written=%d obj_size=%d", bytes_written, obj_size);
+
+        // Done, close file and unlock
+        pios_close(fd);
+    }
+
+    if (bytes_written != obj_size) {
+        return -7;
+    }
+
+    return 0;
+}
+
+/**
+ * @brief Load one object instance from the filesystem
+ * @param[in] fs_id The filesystem to use for this action
+ * @param[in] obj UAVObject ID of the object to load
+ * @param[in] obj_inst_id The instance of the object to load
+ * @param[in] obj_data Buffer to hold the contents of the loaded object
+ * @param[in] obj_size Size of the object to be loaded
+ * @return 0 if success or error code
+ * @retval -1 if fs_id is not a valid filesystem instance
+ * @retval -2 if failed to start transaction
+ * @retval -3 if object not found in filesystem
+ * @retval -4 if object size in filesystem does not exactly match buffer size
+ * @retval -5 if reading the object data from flash fails
+ */
+int32_t PIOS_FLASHFS_ObjLoad(
+	__attribute__((unused)) uintptr_t fs_id, 
+	uint32_t obj_id, 
+	uint16_t obj_inst_id, 
+	uint8_t *obj_data, 
+	uint16_t obj_size)
+{
+    int fd;
+    char filename[OBJECTPATHNAME_LEN];
+    uint32_t bytes_read = 0;
+
+    pios_trace(PIOS_TRACE_TEST, "PIOS_FLASHFS_ObjLoad");
+
+    // Get filename
+    getObjectPathAndName(fs_id, obj_id, obj_inst_id, filename);
+
+    fd = pios_open(filename,O_RDONLY, S_IREAD | S_IWRITE);
+
+    pios_trace(PIOS_TRACE_TEST, "pios_open (%s) retval=%d.", filename, fd);
+
+    if (fd < 0) {
+	pios_trace(PIOS_TRACE_ERROR, "Couldn't open %s", filename);
+    }
+    else {
+        // Load object
+        bytes_read  = pios_read(fd, (void *)obj_data, (uint32_t)obj_size);
+        pios_trace(PIOS_TRACE_TEST, "pios_read (%d) expected=%d.", obj_size, bytes_read);
+
+        // Done, close file and unlock
+        pios_close(fd);
+    }
+
+    if (bytes_read != obj_size)
+        return -1;
+
+    return 0;
+}
+
+/**
+ * @brief Delete one instance of an object from the filesystem
+ * @param[in] fs_id The filesystem to use for this action
+ * @param[in] obj UAVObject ID of the object to delete
+ * @param[in] obj_inst_id The instance of the object to delete
+ * @return 0 if success or error code
+ * @retval -1 if fs_id is not a valid filesystem instance
+ * @retval -2 if failed to start transaction
+ * @retval -3 if failed to delete the object from the filesystem
+ */
+int32_t PIOS_FLASHFS_ObjDelete(
+	__attribute__((unused)) uintptr_t fs_id, 
+	uint32_t obj_id, 
+	uint16_t obj_inst_id)
+{
+    char filename[OBJECTPATHNAME_LEN];
+    int retval;
+    pios_trace(PIOS_TRACE_TEST, "PIOS_FLASHFS_ObjDelete");
+
+    // Get filename
+    getObjectPathAndName(fs_id, obj_id, obj_inst_id, filename);
+
+    // Delete file
+    retval = pios_unlink((char *)filename);
+    pios_trace(PIOS_TRACE_TEST, "pios_unlink(%s) retval=%d" , filename, retval);
+
+    return 0;
+}
+
+/**
+ * @brief Erases all filesystem arenas and activate the first arena
+ * @param[in] fs_id The filesystem to use for this action
+ * @return 0 if success or error code
+ * @retval -1 if fs_id is not a valid filesystem instance
+ * @retval -2 if failed to start transaction
+ * @retval -3 if failed to erase all arenas
+ * @retval -4 if failed to activate arena 0
+ * @retval -5 if failed to mount arena 0
+ */
+int32_t PIOS_FLASHFS_Format(
+	__attribute__((unused)) uintptr_t fs_id)
+{
+    int retval;
+    pios_trace(PIOS_TRACE_TEST, "PIOS_FLASHFS_Format");
+
+    // Convert fs_id into device name
+    char devicename[DEVICENAME_LEN];
+    getDeviceName(fs_id, devicename);
+
+    retval = pios_format(devicename,
+		       TRUE,  // unmount flag
+		       TRUE,  // force unmount flag
+		       TRUE);  // remount
+
+    pios_trace(PIOS_TRACE_TEST, "pios_format (%s) retval=%d.", devicename, retval);
+    return retval; 
+}
+
+/**
+ * @brief Returs stats for the filesystems
+ * @param[in] fs_id The filesystem to use for this action
+ * @return 0 if success or error code
+ * @retval -1 if fs_id is not a valid filesystem instance
+ */
+int32_t PIOS_FLASHFS_GetStats(
+	__attribute__((unused)) uintptr_t fs_id, 
+	__attribute__((unused)) struct PIOS_FLASHFS_Stats *stats)
+{
+    // pios_trace(PIOS_TRACE_TEST, "PIOS_FLASHFS_GetStats");
+
+    // Convert fs_id into device name
+    char devicename[DEVICENAME_LEN];
+    getDeviceName(fs_id, devicename);
+
+    // Get yaffs statistics for that device
+    stats->num_free_slots = yaffs_freespace(devicename);
+    stats->num_active_slots = yaffs_totalspace(devicename) - stats->num_free_slots;
+
+    // Return device usage statistics
+    return 0;
+}
+
+
+/**
+ * @}
+ * @}
+ */

flight/pios/common/pios_trace.c

@@ -0,0 +1,45 @@
+/**
+ ******************************************************************************
+ *
+ * @file       pios_trace.c
+ * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2014.
+ * @addtogroup PiOS
+ * @{
+ * @addtogroup PiOS
+ * @{
+ * @brief PiOS trace debug function
+ *****************************************************************************/
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+
+#include "pios_trace.h"
+
+unsigned pios_trace_mask = 0;
+
+
+unsigned pios_set_trace(unsigned tm)
+{
+	pios_trace_mask = tm;
+	return pios_trace_mask;
+}
+
+unsigned pios_get_trace(void)
+{
+	return pios_trace_mask;
+}
+

flight/pios/inc/pios_flashfs.h

@@ -34,6 +34,9 @@ struct PIOS_FLASHFS_Stats {
     uint16_t num_active_slots; /* slots in active state */
 };
 
+// define logfs subdirectory of a yaffs flash device
+#define PIOS_LOGFS_DIR "logfs"
+
 int32_t PIOS_FLASHFS_Format(uintptr_t fs_id);
 int32_t PIOS_FLASHFS_ObjSave(uintptr_t fs_id, uint32_t obj_id, uint16_t obj_inst_id, uint8_t *obj_data, uint16_t obj_size);
 int32_t PIOS_FLASHFS_ObjLoad(uintptr_t fs_id, uint32_t obj_id, uint16_t obj_inst_id, uint8_t *obj_data, uint16_t obj_size);

flight/pios/inc/pios_stdio.h

@@ -0,0 +1,93 @@
+/**
+ ******************************************************************************
+ *
+ * @file       pios_stdio.h
+ * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2014.
+ * @addtogroup PiOS
+ * @{
+ * @addtogroup PiOS
+ * @{
+ * @brief PiOS stdio posix file functions
+ *****************************************************************************/
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef PIOS_STDIO_H
+#define PIOS_STDIO_H
+
+#include "yaffsfs.h"
+
+#define pios_open(path, oflag, mode)	yaffs_open(path, oflag, mode)
+#define pios_close(fd)			yaffs_close(fd)
+#define pios_fsync(fd)			yaffs_fsync(fd)
+#define pios_flush(fd)			yaffs_flush(fd)
+#define pios_read(fd, buf, nbyte)	yaffs_read(fd, buf, nbyte)
+#define pios_write(fd, buf, nbyte)	yaffs_write(fd, buf, nbyte)
+#define pios_fdatasync(fd)		yaffs_fdatasync(fd)
+#define pios_access(path, amode) 	yaffs_access(path, amode)
+#define pios_dup(fd) 			yaffs_dup(fd)
+#define pios_pread(fd, buf, nbyte, offset) yaffs_pread(fd, buf, nbyte, offset)
+#define pios_pwrite(fd, buf, nbyte, offset) yaffs_pwrite(fd, buf, nbyte, offset)
+#define pios_lseek(fd, offset, whence)  yaffs_lseek(fd, offset, whence)
+#define pios_truncate(path, new_size)	yaffs_truncate(path, new_size)
+#define pios_ftruncate(fd, new_size) 	yaffs_ftruncate(fd, new_size)
+#define pios_unlink(path)		yaffs_unlink(path)
+#define pios_rename(oldPath, newPath) 	yaffs_rename(oldPath, newPath) 
+#define pios_stat(path, buf) 		yaffs_stat(path, buf) 
+#define pios_lstat(path, buf) 		yaffs_lstat(path, buf) 
+#define pios_fstat(fd, buf) 		yaffs_fstat(fd, buf) 
+#define pios_utime(path, buf) 		yaffs_utime(path, buf)
+#define pios_futime(fd, buf) 		yaffs_futime(fd, buf)
+#define pios_setxattr(path, name, data, size, flags) 	yaffs_setxattr(path, name, data, size, flags)
+#define pios_lsetxattr(path, name, data, size, flags) yaffs_lsetxattr(path, name, data, size, flags)
+#define pios_fsetxattr(fd, name, data, size, flags) 	yaffs_fsetxattr(path, name, data, size, flags)
+
+#define pios_getxattr(path, name, data, size) yaffs_getxattr(path, name, data, size)
+#define pios_lgetxattr(path, name, data, size) yaffs_lgetxattr(path, name, data, size)
+#define pios_fgetxattr(fd, name, data, size) yaffs_fgetxattr(fd, name, data, size)
+#define pios_removexattr(path, name) 	yaffs_removexattr(path, name)
+#define pios_lremoveattr(path, name) 	yaffs_lremovexattr(path, name)
+#define pios_fremovexattr(fd, name) 	yaffs_fremovexattr(fd, name)
+#define pios_listxattr(path, list, size) yaffs_listxattr(path, list, size)
+#define pios_llistxattr(path, list,size) yaffs_llistxattr(path, list, size)
+#define pios_flistxattr(fd, list, size) yaffs_flistxattr(fd, list, size)
+#define pios_chmod(path, mode) 		yaffs_chmod(path, mode)
+#define pios_fchmod(fd, mode) 		yaffs_fchmod(fd, mode)
+#define pios_mkdir(path, mode) 		yaffs_mkdir(path, mode) 
+#define pios_rmdir(path) 		yaffs_rmdir(path) 
+#define pios_opendir(dirname) 		yaffs_opendir(dirname) 
+#define pios_readdir(dirp) 		yaffs_readdir(dirp)
+#define pios_rewinddir(dirp) 		yaffs_rewinddir(dirp) 
+#define pios_closedir(dirp) 		yaffs_closedir(dirp) 
+#define pios_mount(path) 		yaffs_mount(path) 
+#define pios_mount2(path, read_only) 	yaffs_mount2(path, read_only)
+#define pios_mount3(path, read_only, skip_checkpt) yaffs_mount3(path, read_only, skip_checkpt)
+#define pios_umount(path) 		yaffs_unmount(path) 
+#define pios_umount2(path, force) 	yaffs_unmount2(path, force)
+#define pios_remount(path, force, read_only) yaffs_remount(path, force,read_only)
+#define pios_format(path, unmount_flag, force_unmount_flag, remount_flag)  yaffs_format(path, unmount_flag, force_unmount_flag, remount_flag)
+#define pios_sync(path) 		yaffs_sync(path) 
+#define pios_symlink(oldpath, newpath) 	yaffs_symlink(oldpath, newpath)
+#define pios_readlink(path, buf, bufsize) yaffs_readlink(path, buf, bufsiz)
+#define pios_link(oldpath, newpath) 	yaffs_link(oldpath, newpath)
+#define pios_mknod(pathname, mode, dev) yaffs_mknod(pathname, mode, dev)
+#define pios_freespace(path) 		yaffs_freespace(path)
+#define pios_totalspace(path) 		yaffs_totalspace(path)
+
+#define pios_DIR			yaffs_DIR
+#define pios_dirent			yaffs_dirent
+
+
+#endif /* PIOS_STDIO_H */

flight/pios/inc/pios_trace.h

@@ -0,0 +1,83 @@
+/**
+ ******************************************************************************
+ *
+ * @file       pios_trace.h
+ * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2014.
+ * @addtogroup PiOS
+ * @{
+ * @addtogroup PiOS
+ * @{
+ * @brief PiOS debug trace printing interface
+ *****************************************************************************/
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef PIOS_TRACE_H
+#define PIOS_TRACE_H
+
+extern unsigned int pios_trace_mask;
+
+/*
+ * Tracing flags.
+ * The flags masked in PIOS_TRACE_ALWAYS are always traced.
+ */
+
+#define PIOS_TRACE_OS			0x00000002
+#define PIOS_TRACE_ALLOCATE		0x00000004
+#define PIOS_TRACE_TEST			0x00000008
+#define PIOS_TRACE_BAD_BLOCKS	0x00000010
+#define PIOS_TRACE_ERASE		0x00000020
+#define PIOS_TRACE_GC			0x00000040
+#define PIOS_TRACE_WRITE		0x00000080
+#define PIOS_TRACE_TRACING		0x00000100
+#define PIOS_TRACE_DELETION		0x00000200
+#define PIOS_TRACE_BUFFERS		0x00000400
+#define PIOS_TRACE_NANDACCESS	0x00000800
+#define PIOS_TRACE_GC_DETAIL	0x00001000
+#define PIOS_TRACE_SCAN_DEBUG	0x00002000
+#define PIOS_TRACE_MTD			0x00004000
+#define PIOS_TRACE_CHECKPOINT	0x00008000
+
+#define PIOS_TRACE_VERIFY		0x00010000
+#define PIOS_TRACE_VERIFY_NAND	0x00020000
+#define PIOS_TRACE_VERIFY_FULL	0x00040000
+#define PIOS_TRACE_VERIFY_ALL	0x000f0000
+
+#define PIOS_TRACE_SYNC			0x00100000
+#define PIOS_TRACE_BACKGROUND	0x00200000
+#define PIOS_TRACE_LOCK			0x00400000
+#define PIOS_TRACE_MOUNT		0x00800000
+
+#define PIOS_TRACE_ERROR		0x40000000
+#define PIOS_TRACE_BUG			0x80000000
+#define PIOS_TRACE_ALWAYS		0xf0000000
+
+
+
+#ifdef PIOS_TRACE
+#define pios_trace(msk, fmt, ...) do { \
+	if (pios_trace_mask & (msk)) \
+		printf("pios_trace: " fmt "\n", ##__VA_ARGS__); \
+} while (0)
+#else
+#define pios_trace(msk, fmt, ...) 
+#endif
+
+/* Trace control functions */
+unsigned  pios_set_trace(unsigned tm);
+unsigned  pios_get_trace(void);
+
+
+#endif

flight/pios/posix/libraries/yaffs2/yaffs_impl.mk

@@ -0,0 +1,27 @@
+#
+# Rules to add yaffs2 to the PiOS target
+#
+#
+# Note that the PIOS target-specific makefile will detect that YAFFS2_DIR
+# has been defined and add in the target-specific pieces separately.
+#
+
+
+#
+# Directory containing this makefile
+#
+YAFFS2_SIMPOSIX_DIR			:=	$(dir $(lastword $(MAKEFILE_LIST)))
+
+# Compiler options 
+#
+CDEFS				+= -DCONFIG_YAFFS_DIRECT
+CDEFS				+= -DCONFIG_YAFFS_DEFINES_TYPES
+CDEFS				+= -DCONFIG_YAFFS_PROVIDE_DEFS
+CDEFS				+= -DCONFIG_YAFFSFS_PROVIDE_VALUES
+#ARCHFLAGS			+= -DARCH_POSIX
+
+#
+# Yaffs2 device library source and includes
+#
+SRC				+=	$(sort $(wildcard $(YAFFS2_SIMPOSIX_DIR)*.c))
+#EXTRAINCDIRS			+=	$(YAFFS2_DIR)/inc

flight/pios/posix/libraries/yaffs2/yaffs_nor_drv.c

@@ -0,0 +1,347 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This is an interface module for handling NOR in yaffs1 mode.
+ */
+
+/* This code is intended to be used with "regular" NOR that is bit-modifyable.
+ *
+ * Each "chunk" is a contguous area of 512 + 16 bytes.
+ * This makes 248 such chunks with some space left over where a format markerr
+ * is stored.
+ */
+
+#include "yaffs_nor_drv.h"
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_flashif.h"
+#include "yaffs_guts.h"
+
+/* Tunable data */
+#define DATA_BYTES_PER_CHUNK	512
+#define SPARE_BYTES_PER_CHUNK	16
+#define BLOCK_SIZE_IN_BYTES 	(128*1024)
+#define BYTES_IN_DEVICE		(4*1024*1024)
+
+#define BYTES_PER_CHUNK		(DATA_BYTES_PER_CHUNK + SPARE_BYTES_PER_CHUNK)
+#define SPARE_AREA_OFFSET	DATA_BYTES_PER_CHUNK
+#define CHUNKS_PER_BLOCK (BLOCK_SIZE_IN_BYTES/BYTES_PER_CHUNK)
+
+#define BLOCKS_IN_DEVICE	(BYTES_IN_DEVICE/BLOCK_SIZE_IN_BYTES)
+
+#define YNOR_PREMARKER          (0xF6)
+#define YNOR_POSTMARKER         (0xF0)
+
+#define FORMAT_OFFSET		(CHUNKS_PER_BLOCK * BYTES_PER_CHUNK)
+#define FORMAT_VALUE		0x1234
+
+#if 1
+
+/* Compile this for a simulation */
+#include "ynorsim.h"
+
+static struct nor_sim *nor_sim;
+
+#define nor_drv_FlashInit() do {nor_sim = ynorsim_initialise("emfile-nor", BLOCKS_IN_DEVICE, BLOCK_SIZE_IN_BYTES); } while(0)
+#define nor_drv_FlashDeinit() ynorsim_shutdown(nor_sim)
+#define nor_drv_FlashWrite32(addr,buf,nwords) ynorsim_wr32(nor_sim,addr,buf,nwords)
+#define nor_drv_FlashRead32(addr,buf,nwords) ynorsim_rd32(nor_sim,addr,buf,nwords)
+#define nor_drv_FlashEraseBlock(addr) ynorsim_erase(nor_sim,addr)
+#define DEVICE_BASE     ynorsim_get_base(nor_sim)
+
+#else
+
+/* Compile this to hook up to read hardware */
+#include "../blob/yflashrw.h"
+#define nor_drv_FlashInit()  do{} while(0)
+#define nor_drv_FlashDeinit() do {} while(0)
+#define nor_drv_FlashWrite32(addr,buf,nwords) Y_FlashWrite(addr,buf,nwords)
+#define nor_drv_FlashRead32(addr,buf,nwords)  Y_FlashRead(addr,buf,nwords)
+#define nor_drv_FlashEraseBlock(addr)         Y_FlashErase(addr,BLOCK_SIZE_IN_BYTES)
+#define DEVICE_BASE     (32 * 1024 * 1024)
+#endif
+
+
+static u32 *Block2Addr(struct yaffs_dev *dev, int blockNumber)
+{
+	u8 *addr;
+
+	dev=dev;
+
+	addr = (u8*)DEVICE_BASE;
+	addr += blockNumber * BLOCK_SIZE_IN_BYTES;
+
+	return (u32 *) addr;
+}
+
+static u32 *Block2FormatAddr(struct yaffs_dev *dev, int blockNumber)
+{
+	u8 *addr;
+
+	addr = (u8*) Block2Addr(dev,blockNumber);
+	addr += FORMAT_OFFSET;
+
+	return (u32 *)addr;
+}
+
+static u32 *Chunk2DataAddr(struct yaffs_dev *dev, int chunk_id)
+{
+	unsigned block;
+	unsigned chunkInBlock;
+	u8 *addr;
+
+	block = chunk_id/dev->param.chunks_per_block;
+	chunkInBlock = chunk_id % dev->param.chunks_per_block;
+
+	addr = (u8*) Block2Addr(dev,block);
+	addr += chunkInBlock * BYTES_PER_CHUNK;
+
+	return (u32 *)addr;
+}
+
+static u32 *Chunk2SpareAddr(struct yaffs_dev *dev, int chunk_id)
+{
+	u8 *addr;
+
+	addr = (u8*) Chunk2DataAddr(dev, chunk_id);
+	addr += SPARE_AREA_OFFSET;
+	return (u32 *)addr;
+}
+
+
+static void nor_drv_AndBytes(u8*target, const u8 *src, int nbytes)
+{
+	while(nbytes > 0){
+		*target &= *src;
+		target++;
+		src++;
+		nbytes--;
+	}
+}
+
+static int nor_drv_WriteChunkToNAND(struct yaffs_dev *dev,int nand_chunk,
+				    const u8 *data, int data_len,
+				    const u8 *oob, int oob_len)
+{
+	u32 *dataAddr = Chunk2DataAddr(dev,nand_chunk);
+	u32 *spareAddr = Chunk2SpareAddr(dev,nand_chunk);
+
+	struct yaffs_spare *spare = (struct yaffs_spare *)oob;
+	struct yaffs_spare tmpSpare;
+
+	(void) oob_len;
+
+	/* We should only be getting called for one of 3 reasons:
+         * Writing a chunk: data and spare will not be NULL
+         * Writing a deletion marker: data will be NULL, spare not NULL
+         * Writing a bad block marker: data will be NULL, spare not NULL
+         */
+
+	if(sizeof(struct yaffs_spare) != SPARE_BYTES_PER_CHUNK)
+		BUG();
+
+	if(data && oob) {
+		if(spare->page_status != 0xff)
+			BUG();
+		/* Write a pre-marker */
+		memset(&tmpSpare,0xff,sizeof(tmpSpare));
+		tmpSpare.page_status = YNOR_PREMARKER;
+		nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+
+		/* Write the data */
+		nor_drv_FlashWrite32(dataAddr,(u32 *)data, data_len/ sizeof(u32));
+
+		memcpy(&tmpSpare,spare,sizeof(struct yaffs_spare));
+
+		/* Write the real tags, but override the premarker*/
+		tmpSpare.page_status = YNOR_PREMARKER;
+		nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+
+		/* Write a post-marker */
+		tmpSpare.page_status = YNOR_POSTMARKER;
+		nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(tmpSpare)/sizeof(u32));
+
+	} else if(spare){
+		/* This has to be a read-modify-write operation to handle NOR-ness */
+
+		nor_drv_FlashRead32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+
+		nor_drv_AndBytes((u8 *)&tmpSpare,(u8 *)spare,sizeof(struct yaffs_spare));
+
+		nor_drv_FlashWrite32(spareAddr,(u32 *)&tmpSpare,sizeof(struct yaffs_spare)/sizeof(u32));
+	} else {
+		BUG();
+	}
+
+	return YAFFS_OK;
+}
+
+static int nor_drv_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk,
+					u8 *data, int data_len,
+					u8 *oob, int oob_len,
+					enum yaffs_ecc_result *ecc_result)
+{
+	struct yaffs_spare *spare = (struct yaffs_spare *)oob;
+
+	u32 *dataAddr = Chunk2DataAddr(dev,nand_chunk);
+	u32 *spareAddr = Chunk2SpareAddr(dev,nand_chunk);
+
+	if (data) {
+		nor_drv_FlashRead32(dataAddr,(u32 *)data,dev->param.total_bytes_per_chunk / sizeof(u32));
+	}
+
+	if (oob) {
+		nor_drv_FlashRead32(spareAddr,(u32 *)spare, oob_len/ sizeof(u32));
+
+		/* If the page status is YNOR_POSTMARKER then it was written properly
+                 * so change that to 0xFF so that the rest of yaffs is happy.
+                 */
+		if(spare->page_status == YNOR_POSTMARKER)
+			spare->page_status = 0xff;
+		else if(spare->page_status != 0xff &&
+			(spare->page_status | YNOR_PREMARKER) != 0xff)
+			spare->page_status = YNOR_PREMARKER;
+	}
+
+	if(ecc_result)
+		*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+	return YAFFS_OK;
+
+}
+
+
+static int nor_drv_FormatBlock(struct yaffs_dev *dev, int blockNumber)
+{
+	u32 *blockAddr = Block2Addr(dev,blockNumber);
+	u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+	u32 formatValue = FORMAT_VALUE;
+
+	nor_drv_FlashEraseBlock(blockAddr);
+	nor_drv_FlashWrite32(formatAddr,&formatValue,1);
+
+	return YAFFS_OK;
+}
+
+static int nor_drv_UnformatBlock(struct yaffs_dev *dev, int blockNumber)
+{
+	u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+	u32 formatValue = 0;
+
+	nor_drv_FlashWrite32(formatAddr,&formatValue,1);
+
+	return YAFFS_OK;
+}
+
+static int nor_drv_IsBlockFormatted(struct yaffs_dev *dev, int blockNumber)
+{
+	u32 *formatAddr = Block2FormatAddr(dev,blockNumber);
+	u32 formatValue;
+
+
+	nor_drv_FlashRead32(formatAddr,&formatValue,1);
+
+	return (formatValue == FORMAT_VALUE);
+}
+
+static int nor_drv_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
+{
+
+	if(blockNumber < 0 || blockNumber >= BLOCKS_IN_DEVICE)
+	{
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Attempt to erase non-existant block %d\n",
+			blockNumber);
+		return YAFFS_FAIL;
+	}
+	else
+	{
+		nor_drv_UnformatBlock(dev,blockNumber);
+		nor_drv_FormatBlock(dev,blockNumber);
+		return YAFFS_OK;
+	}
+
+}
+
+static int nor_drv_InitialiseNAND(struct yaffs_dev *dev)
+{
+	int i;
+
+	nor_drv_FlashInit();
+	/* Go through the blocks formatting them if they are not formatted */
+	for(i = dev->param.start_block; i <= dev->param.end_block; i++){
+		if(!nor_drv_IsBlockFormatted(dev,i)){
+			nor_drv_FormatBlock(dev,i);
+		}
+	}
+	return YAFFS_OK;
+}
+
+static int nor_drv_Deinitialise_flash_fn(struct yaffs_dev *dev)
+{
+	dev=dev;
+
+	nor_drv_FlashDeinit();
+
+	return YAFFS_OK;
+}
+
+
+struct yaffs_dev *yaffs_nor_install_drv(const char *name)
+{
+
+	struct yaffs_dev *dev = malloc(sizeof(struct yaffs_dev));
+	char *name_copy = strdup(name);
+	struct yaffs_param *param;
+	struct yaffs_driver *drv;
+
+
+	if(!dev || !name_copy) {
+		free(name_copy);
+		free(dev);
+		return NULL;
+	}
+
+	param = &dev->param;
+	drv = &dev->drv;
+
+	memset(dev, 0, sizeof(*dev));
+
+	param->name = name_copy;
+
+	param->total_bytes_per_chunk = DATA_BYTES_PER_CHUNK;
+	param->chunks_per_block = CHUNKS_PER_BLOCK;
+	param->n_reserved_blocks = 2;
+	param->start_block = 0; // Can use block 0
+	param->end_block = BLOCKS_IN_DEVICE - 1; // Last block
+	param->use_nand_ecc = 0; // use YAFFS's ECC
+	param->disable_soft_del = 1;
+
+	drv->drv_write_chunk_fn = nor_drv_WriteChunkToNAND;
+	drv->drv_read_chunk_fn = nor_drv_ReadChunkFromNAND;
+	drv->drv_erase_fn = nor_drv_EraseBlockInNAND;
+	drv->drv_initialise_fn = nor_drv_InitialiseNAND;
+	drv->drv_deinitialise_fn = nor_drv_Deinitialise_flash_fn;
+
+	param->n_caches = 10;
+	param->disable_soft_del = 1;
+
+	dev->driver_context = (void *) nor_sim;
+
+	yaffs_add_device(dev);
+
+	return NULL;
+}

flight/pios/posix/libraries/yaffs2/yaffs_nor_drv.h

@@ -0,0 +1,25 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YAFFS_NOR_DRV_H__
+#define __YAFFS_NOR_DRV_H__
+
+struct yaffs_dev;
+struct yaffs_dev *yaffs_nor_install_drv(const char *name);
+
+#endif
+
+

flight/pios/posix/libraries/yaffs2/yaffs_osglue.c

@@ -0,0 +1,217 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Example OS glue functions for running on a Linux/POSIX system.
+ */
+
+#include "yaffscfg.h"
+#include "yaffs_guts.h"
+#include "yaffsfs.h"
+#include "yaffs_trace.h"
+#include <assert.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "pios_trace.h"
+#include "yaffsfs.h"
+
+/*
+ * yaffsfs_SetError() and yaffsfs_GetError()
+ * Do whatever to set the system error.
+ * yaffsfs_GetError() just fetches the last error.
+ */
+
+static int yaffsfs_lastError;
+
+void yaffsfs_SetError(int err)
+{
+	//Do whatever to set error
+	yaffsfs_lastError = err;
+	errno = err;
+	pios_trace(PIOS_TRACE_ERROR, "yaffsfs_SetError(%d) %s", err, yaffs_error_to_str(err) );
+}
+
+int yaffsfs_GetLastError(void)
+{
+	return yaffsfs_lastError;
+}
+
+/*
+ * yaffsfs_CheckMemRegion()
+ * Check that access to an address is valid.
+ * This can check memory is in bounds and is writable etc.
+ *
+ * Returns 0 if ok, negative if not.
+ */
+int yaffsfs_CheckMemRegion(const void *addr, size_t size, int write_request)
+{
+	if(!addr)
+		return -1;
+	return 0;
+}
+
+/*
+ * yaffsfs_Lock()
+ * yaffsfs_Unlock()
+ * A single mechanism to lock and unlock yaffs. Hook up to a mutex or whatever.
+ * Here are two examples, one using POSIX pthreads, the other doing nothing.
+ *
+ * If we use pthreads then we also start a background gc thread.
+ */
+
+#if 1
+
+#include <pthread.h>
+
+static pthread_mutex_t mutex1;
+static pthread_t bc_gc_thread;
+
+void yaffsfs_Lock(void)
+{
+	pthread_mutex_lock( &mutex1 );
+}
+
+void yaffsfs_Unlock(void)
+{
+	pthread_mutex_unlock( &mutex1 );
+}
+
+static void *bg_gc_func(void *dummy)
+{
+	struct yaffs_dev *dev;
+	int urgent = 0;
+	int result;
+	int next_urgent;
+
+	/* Sleep for a bit to allow start up */
+	sleep(2);
+
+
+	while (1) {
+		/* Iterate through devices, do bg gc updating ungency */
+		yaffs_dev_rewind();
+		next_urgent = 0;
+
+		while ((dev = yaffs_next_dev()) != NULL) {
+			result = yaffs_do_background_gc_reldev(dev, urgent);
+			if (result > 0)
+				next_urgent = 1;
+		}
+
+		urgent = next_urgent;
+
+		if (next_urgent)
+			sleep(1);
+		else
+			sleep(5);
+	}
+
+	/* Don't ever return. */
+	return NULL;
+}
+
+void yaffsfs_LockInit(void)
+{
+	/* Initialise lock */
+	pthread_mutex_init(&mutex1, NULL);
+
+	/* Sneak in starting a background gc thread too */
+	// pthread_create(&bc_gc_thread, NULL, bg_gc_func, NULL);
+}
+
+#else
+
+void yaffsfs_Lock(void)
+{
+}
+
+void yaffsfs_Unlock(void)
+{
+}
+
+void yaffsfs_LockInit(void)
+{
+}
+#endif
+
+/*
+ * yaffsfs_CurrentTime() retrns a 32-bit timestamp.
+ *
+ * Can return 0 if your system does not care about time.
+ */
+
+u32 yaffsfs_CurrentTime(void)
+{
+	return time(NULL);
+}
+
+
+/*
+ * yaffsfs_malloc()
+ * yaffsfs_free()
+ *
+ * Functions to allocate and free memory.
+ */
+
+#ifdef CONFIG_YAFFS_TEST_MALLOC
+
+static int yaffs_kill_alloc = 0;
+static size_t total_malloced = 0;
+static size_t malloc_limit = 0 & 6000000;
+
+void *yaffsfs_malloc(size_t size)
+{
+	void * this;
+	if(yaffs_kill_alloc)
+		return NULL;
+	if(malloc_limit && malloc_limit <(total_malloced + size) )
+		return NULL;
+
+	this = malloc(size);
+	if(this)
+		total_malloced += size;
+	return this;
+}
+
+#else
+
+void *yaffsfs_malloc(size_t size)
+{
+	return malloc(size);
+}
+
+#endif
+
+void yaffsfs_free(void *ptr)
+{
+	free(ptr);
+}
+
+void yaffsfs_OSInitialisation(void)
+{
+	yaffsfs_LockInit();
+}
+
+/*
+ * yaffs_bug_fn()
+ * Function to report a bug.
+ */
+
+void yaffs_bug_fn(const char *file_name, int line_no)
+{
+	printf("yaffs bug detected %s:%d\n",
+		file_name, line_no);
+	assert(0);
+}

flight/pios/posix/libraries/yaffs2/yaffscfg2k.c

@@ -0,0 +1,194 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * yaffscfg2k.c  The configuration for the "direct" use of yaffs.
+ *
+ * This file is intended to be modified to your requirements.
+ * There is no need to redistribute this file.
+ */
+
+#include "yaffscfg.h"
+#include "yaffs_guts.h"
+#include "yaffsfs.h"
+#include "yaffs_trace.h"
+#include "yaffs_osglue.h"
+
+
+#include <errno.h>
+#include <signal.h>
+
+
+#include "pios.h"
+#include "pios_trace.h"
+#include "pios_stdio.h"
+
+#include <openpilot.h>
+#include "pios_flashfs.h" /* API for flash filesystem */
+#include "pios_flashfs_logfs_priv.h"
+
+#include <pios_stdio.h>
+
+
+unsigned yaffs_trace_mask = 0;
+	//YAFFS_TRACE_ERROR |
+	//YAFFS_TRACE_BUG			 |
+	//YAFFS_TRACE_ALWAYS |
+	//0;
+
+int random_seed;
+int simulate_power_failure = 0;
+static unsigned int pios_flash_device_count=0;
+
+
+/* Configure the devices that will be used */
+
+#include "yaffs_nor_drv.h"
+
+// called first before device device driver setup so need to change
+int yaffs_start_up(void)
+{
+	static int start_up_called = 0;
+
+	if(start_up_called)
+		return 0;
+	start_up_called = 1;
+
+	/* Call the OS initialisation (eg. set up lock semaphore */
+	yaffsfs_OSInitialisation();
+
+	return 0;
+}
+
+
+
+void yaffsSigHandler ( int sig)
+{
+    char devicename[8];
+    int fs_id;
+
+	    pios_trace(PIOS_TRACE_TEST, "yaffsSigHandler sig=%d", sig);
+        switch (sig)
+        {
+          case SIGQUIT:
+          case SIGTERM:
+          case SIGKILL:
+          case SIGINT:
+
+			   for (fs_id =0; fs_id < pios_flash_device_count; fs_id++)
+			   {
+			     snprintf(devicename,6, "/dev%01u", (unsigned) fs_id);
+
+			     pios_umount((const char *)devicename);
+
+			   }
+			   pios_flash_device_count=0;
+			   exit(1);
+               break;
+          default:
+		break;
+
+        }
+}
+
+static void yaffsSigSetup
+(
+void (*sighandler)(int sig)
+)
+{
+    //sigset_t block_sigusr;
+    struct sigaction sa;
+
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sa.sa_handler = sighandler;
+    if (sigaction(SIGQUIT, &sa, NULL))  return;
+
+
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sa.sa_handler = sighandler;
+    if (sigaction(SIGINT , &sa, NULL))  return;
+
+
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sa.sa_handler = sighandler;
+    if (sigaction(SIGTERM, &sa, NULL))  return;
+
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sa.sa_handler = sighandler;
+    if (sigaction(SIGKILL, &sa, NULL))  return;
+
+    return;
+}
+
+
+
+
+/**
+ * @brief Initialize the flash object setting FS.  Each call creates a yaffs device
+ * @return 0 if success, -1 if failure
+ */
+int32_t PIOS_FLASHFS_Logfs_Init(
+	__attribute__((unused)) uintptr_t *fs_id, // return identifier for fs device
+	__attribute__((unused)) const struct flashfs_logfs_cfg *cfg,     //optional - if flash
+	__attribute__((unused)) const struct pios_flash_driver *driver,  //optional - if flash
+	__attribute__((unused)) uintptr_t flash_id)						 //optional - if flash
+{
+    int retval;
+    pios_trace(PIOS_TRACE_TEST, "PIOS_FLASHFS_Logfs_Init");
+    char devicename[8];
+    char logfs_path[12];
+
+    // Initialise the yaffs OS subsystem
+    if (yaffs_start_up()) {
+        PIOS_Assert(0);
+    }
+
+    // Allocate the next device id
+    *fs_id = pios_flash_device_count;
+    pios_flash_device_count++;
+
+    snprintf(devicename,6, "/dev%01u", (unsigned) *fs_id);
+
+	// Simposix implementation uses a ram nor simulation which can be installed
+    // as multiple instances
+	yaffs_nor_install_drv(devicename);
+
+
+	sigset_t sigset;
+	sigemptyset(&sigset);
+	yaffsSigSetup(yaffsSigHandler);
+
+	// Attempt to mount the device
+    retval = pios_mount(devicename);
+    if (retval < 0) {
+        pios_trace(PIOS_TRACE_ERROR, "Couldn't mount %s", devicename);
+    }
+    else {
+
+    	//Create a "logfs" directory on each yaffs device for use by the
+    	// pios_logfs API.
+    	snprintf(logfs_path, 12, "%s/%s", devicename, PIOS_LOGFS_DIR);
+
+        // Create the logfs directory if it does not already exist
+    	retval = pios_mkdir(logfs_path, O_CREAT);
+        if (retval < 0) pios_trace(PIOS_TRACE_ERROR, "Couldn't mkdir %s", logfs_path);
+    }
+
+
+    return retval;
+}
+

flight/pios/posix/libraries/yaffs2/ynorsim.c

@@ -0,0 +1,210 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "ynorsim.h"
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <time.h>
+
+#include "pios_trace.h"
+
+#define YNORSIM_FNAME "emfile-nor"
+
+/* Set YNORSIM_BIT_CHANGES to a a value from 1..30 to
+ *simulate bit flipping as the programming happens.
+ * A low value results in faster simulation with less chance of encountering a partially programmed
+ * word.
+ */
+
+//#define YNORSIM_BIT_CHANGES 15
+#define YNORSIM_BIT_CHANGES 2
+
+#if 0
+/* Simulate 32MB of flash in 256k byte blocks.
+ * This stuff is x32.
+ */
+
+#define YNORSIM_BLOCK_SIZE_U32  (256*1024/4)
+#define YNORSIM_DEV_SIZE_U32	(32*1024 * 1024/4)
+#else
+/* Simulate 8MB of flash in 256k byte blocks.
+ * This stuff is x32.
+ */
+
+#define YNORSIM_BLOCK_SIZE_U32  (256*1024/4)
+#define YNORSIM_DEV_SIZE_U32	(8*1024 * 1024/4)
+#endif
+
+struct nor_sim {
+	int n_blocks;
+	int block_size_bytes;
+	int file_size;
+	u32 *word;
+	int initialised;
+	char *fname;
+	int remaining_ops;
+	int nops_so_far;
+};
+
+int ops_multiplier = 500;
+extern int random_seed;
+extern int simulate_power_failure;
+
+static void NorError(struct nor_sim *sim)
+{
+	printf("Nor error on device %s\n", sim->fname);
+	while (1) {
+	}
+}
+
+static void ynorsim_save_image(struct nor_sim *sim)
+{
+	int h;
+	pios_trace(PIOS_TRACE_TEST, "ynorsim_save_image");
+	h = open(sim->fname, O_RDWR | O_CREAT | O_TRUNC, S_IREAD | S_IWRITE);
+	write(h, sim->word, sim->file_size);
+	close(h);
+}
+
+static void ynorsim_restore_image(struct nor_sim *sim)
+{
+	int h;
+	pios_trace(PIOS_TRACE_TEST, "ynorsim_restore_image");
+	h = open(sim->fname, O_RDONLY, S_IREAD | S_IWRITE);
+	memset(sim->word, 0xFF, sim->file_size);
+	read(h, sim->word, sim->file_size);
+	close(h);
+}
+
+static void ynorsim_power_fail(struct nor_sim *sim)
+{
+	ynorsim_save_image(sim);
+	exit(1);
+}
+
+static void ynorsim_maybe_power_fail(struct nor_sim *sim)
+{
+	sim->nops_so_far++;
+	sim->remaining_ops--;
+	if (simulate_power_failure && sim->remaining_ops < 1) {
+		printf("Simulated power failure after %d operations\n",
+		       sim->nops_so_far);
+		ynorsim_power_fail(sim);
+	}
+}
+
+static void ynorsim_ready(struct nor_sim *sim)
+{
+	if (sim->initialised)
+		return;
+	srand(random_seed);
+	sim->remaining_ops = 1000000000;
+	sim->remaining_ops =
+	    (rand() % 10000) * ops_multiplier * YNORSIM_BIT_CHANGES;
+	ynorsim_restore_image(sim);
+	sim->initialised = 1;
+}
+
+/* Public functions. */
+
+void ynorsim_rd32(struct nor_sim *sim, u32 * addr, u32 * buf, int nwords)
+{
+	sim = sim;
+	while (nwords > 0) {
+		*buf = *addr;
+		buf++;
+		addr++;
+		nwords--;
+	}
+}
+
+void ynorsim_wr_one_word32(struct nor_sim *sim, u32 * addr, u32 val)
+{
+	u32 tmp;
+	u32 m;
+	int i;
+
+	tmp = *addr;
+	if (val & ~tmp) {
+		/* Fail due to trying to change a zero into a 1 */
+		printf("attempt to set a zero to one (%x)->(%x)\n", tmp, val);
+		NorError(sim);
+	}
+
+	for (i = 0; i < YNORSIM_BIT_CHANGES; i++) {
+		m = 1 << (rand() & 31);
+		if (!(m & val)) {
+			tmp &= ~m;
+			*addr = tmp;
+			ynorsim_maybe_power_fail(sim);
+		}
+
+	}
+
+	*addr = tmp & val;
+	ynorsim_maybe_power_fail(sim);
+}
+
+void ynorsim_wr32(struct nor_sim *sim, u32 * addr, u32 * buf, int nwords)
+{
+	while (nwords > 0) {
+		ynorsim_wr_one_word32(sim, addr, *buf);
+		addr++;
+		buf++;
+		nwords--;
+	}
+}
+
+void ynorsim_erase(struct nor_sim *sim, u32 * addr)
+{
+	/* Todo... bit flipping */
+	pios_trace(PIOS_TRACE_TEST, "ynorsim_erase");
+	memset(addr, 0xFF, sim->block_size_bytes);
+}
+
+struct nor_sim *ynorsim_initialise(char *name, int n_blocks,
+				   int block_size_bytes)
+{
+	struct nor_sim *sim;
+
+	sim = malloc(sizeof(*sim));
+	if (!sim)
+		return NULL;
+
+	memset(sim, 0, sizeof(*sim));
+	sim->n_blocks = n_blocks;
+	sim->block_size_bytes = block_size_bytes;
+	sim->file_size = n_blocks * block_size_bytes;
+	sim->word = malloc(sim->file_size);
+	sim->fname = strdup(name);
+
+	if(!sim->word)
+		return NULL;
+
+	ynorsim_ready(sim);
+	return sim;
+}
+
+void ynorsim_shutdown(struct nor_sim *sim)
+{
+	ynorsim_save_image(sim);
+	sim->initialised = 0;
+}
+
+u32 *ynorsim_get_base(struct nor_sim *sim)
+{
+	return sim->word;
+}

flight/pios/posix/libraries/yaffs2/ynorsim.h

@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __Y_NORSIM_H__
+#define __Y_NORSIM_H__
+
+#include "yaffs_guts.h"
+
+struct nor_sim;
+
+void ynorsim_rd32(struct nor_sim *sim, u32 *addr, u32 *data, int nwords);
+void ynorsim_wr32(struct nor_sim *sim, u32 *addr, u32 *data, int nwords);
+void ynorsim_erase(struct nor_sim *sim, u32 *addr);
+void ynorsim_shutdown(struct nor_sim *sim);
+struct nor_sim *ynorsim_initialise(char *name, int n_blocks, int block_size_bytes);
+u32 * ynorsim_get_base(struct nor_sim *sim);
+
+#endif

flight/targets/boards/simposix/firmware/Makefile

@@ -70,6 +70,12 @@ UAVOBJSYNTHDIR = $(OUTDIR)/../uavobject-synthetics/flight
 
 # optional component libraries
 include $(PIOS)/common/libraries/FreeRTOS/library.mk
+ifeq ($(USE_YAFFS),YES)
+SRC += $(PIOSCORECOMMON)/pios_logfs.c # Used for yaffs testing
+include $(PIOS)/common/libraries/yaffs2/library.mk  # Only required for yaffs testing
+include $(PIOS)/posix/libraries/yaffs2/yaffs_impl.mk  # Only required for yaffs testing
+endif
+
 #include $(FLIGHTLIB)/PyMite/pymite.mk
 
 # List C source files here. (C dependencies are automatically generated.)
@@ -103,7 +109,12 @@ SRC += $(MATHLIB)/mathmisc.c
 SRC += $(MATHLIB)/butterworth.c
 
 SRC += $(PIOSCORECOMMON)/pios_task_monitor.c
+ifeq ($(USE_YAFFS),YES)
+SRC += $(PIOSCORECOMMON)/pios_logfs.c # Used for yaffs testing
+else
 SRC += $(PIOSCORECOMMON)/pios_dosfs_logfs.c
+endif
+SRC += $(PIOSCORECOMMON)/pios_trace.c
 SRC += $(PIOSCORECOMMON)/pios_debuglog.c
 SRC += $(PIOSCORECOMMON)/pios_callbackscheduler.c
 SRC += $(PIOSCORECOMMON)/pios_deltatime.c
@@ -155,7 +166,10 @@ CFLAGS += -finstrument-functions -ffixed-r10
 else
 CFLAGS += -Os
 endif
-   
+  
+# tracing
+# CFLAGS += -DPIOS_TRACE
+ 
 # common architecture-specific flags from the device-specific library makefile
 CFLAGS += $(ARCHFLAGS)
 

flight/targets/boards/simposix/firmware/pios_board.c

@@ -34,6 +34,7 @@
 #include <manualcontrolsettings.h>
 #include <taskinfo.h>
 
+
 /*
  * Pull in the board-specific static HW definitions.
  * Including .c files is a bit ugly but this allows all of
@@ -119,13 +120,16 @@ void PIOS_Board_Init(void)
     /* Delay system */
     PIOS_DELAY_Init();
 
-    // Initialize dosfs fake flash logfs
+    // Initialize logfs for settings.
+    // If linking in yaffs for testing, this will be /dev0 with settings stored
+    // via the logfs object api in /dev0/logfs/
     if (PIOS_FLASHFS_Logfs_Init(&pios_uavo_settings_fs_id, NULL, NULL, 0)) {
         PIOS_DEBUG_Assert(0);
     }
+    // If linking in yaffs for testing, this will re-use the simposix yaffs /dev0 nor
+    // simulation, which does not support being instanced twice.
     pios_user_fs_id = pios_uavo_settings_fs_id;
 
-
     /* Initialize the task monitor */
     if (PIOS_TASK_MONITOR_Initialize(TASKINFO_RUNNING_NUMELEM)) {
         PIOS_Assert(0);

flight/targets/boards/simposix/firmware/simposix.c

@@ -45,7 +45,6 @@
 #if INCLUDE_TEST_TASKS
 static uint8_t sdcard_available;
 #endif
-FILEINFO File;
 char Buffer[1024];
 uint32_t Cache;
 

flight/targets/boards/simposix/pios_board.h

@@ -29,16 +29,6 @@
 #ifndef PIOS_BOARD_H
 #define PIOS_BOARD_H
 
-/**
- * glue macros for file IO
- **/
-#define FILEINFO FILE *
-#define PIOS_FOPEN_READ(filename, file)                 (file = fopen((char *)filename, "r")) == NULL
-#define PIOS_FOPEN_WRITE(filename, file)                (file = fopen((char *)filename, "w")) == NULL
-#define PIOS_FREAD(file, bufferadr, length, resultadr)  (*resultadr = fread((uint8_t *)bufferadr, 1, length, *file)) != length
-#define PIOS_FWRITE(file, bufferadr, length, resultadr) *resultadr = fwrite((uint8_t *)bufferadr, 1, length, *file)
-#define PIOS_FCLOSE(file)                               fclose(file)
-#define PIOS_FUNLINK(file)                              unlink((char *)filename)
 
 // ------------------------
 // Timers and Channels Used

flight/uavobjects/inc/uavobjectmanager.h

@@ -202,10 +202,6 @@ uint8_t UAVObjUpdateCRC(UAVObjHandle obj_handle, uint16_t instId, uint8_t crc);
 int32_t UAVObjSave(UAVObjHandle obj_handle, uint16_t instId);
 int32_t UAVObjLoad(UAVObjHandle obj_handle, uint16_t instId);
 int32_t UAVObjDelete(UAVObjHandle obj_handle, uint16_t instId);
-#if defined(PIOS_INCLUDE_SDCARD)
-int32_t UAVObjSaveToFile(UAVObjHandle obj_handle, uint16_t instId, FILEINFO *file);
-int32_t UAVObjLoadFromFile(UAVObjHandle obj_handle, FILEINFO *file);
-#endif
 int32_t UAVObjSaveSettings();
 int32_t UAVObjLoadSettings();
 int32_t UAVObjDeleteSettings();