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