/* * 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 * * 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