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7e3644d3cf
Use the latest version of the yaffs code. Fetched from the
yaffs2 git tree and it is based on the following commit:
commit bc76682d93955cfb33051beb503ad9f8a5450578
Merge: 3a8580e ffa781d
Author: Charles Manning <cdhmanning@gmail.com>
Date: Thu Jul 11 17:46:25 2013 +1200
Merge branch 'master' of ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 39084
423 lines
10 KiB
C
423 lines
10 KiB
C
/*
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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_yaffs1.h"
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#include "yportenv.h"
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#include "yaffs_trace.h"
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#include "yaffs_bitmap.h"
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#include "yaffs_getblockinfo.h"
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#include "yaffs_nand.h"
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#include "yaffs_attribs.h"
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int yaffs1_scan(struct yaffs_dev *dev)
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{
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struct yaffs_ext_tags tags;
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int blk;
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int result;
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int chunk;
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int c;
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int deleted;
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enum yaffs_block_state state;
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LIST_HEAD(hard_list);
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struct yaffs_block_info *bi;
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u32 seq_number;
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struct yaffs_obj_hdr *oh;
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struct yaffs_obj *in;
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struct yaffs_obj *parent;
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int alloc_failed = 0;
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struct yaffs_shadow_fixer *shadow_fixers = NULL;
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u8 *chunk_data;
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yaffs_trace(YAFFS_TRACE_SCAN,
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"yaffs1_scan starts intstartblk %d intendblk %d...",
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dev->internal_start_block, dev->internal_end_block);
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chunk_data = yaffs_get_temp_buffer(dev);
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dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
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/* Scan all the blocks to determine their state */
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bi = dev->block_info;
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for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
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blk++) {
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yaffs_clear_chunk_bits(dev, blk);
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bi->pages_in_use = 0;
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bi->soft_del_pages = 0;
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yaffs_query_init_block_state(dev, blk, &state, &seq_number);
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bi->block_state = state;
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bi->seq_number = seq_number;
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if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
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bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
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yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
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"Block scanning block %d state %d seq %d",
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blk, state, seq_number);
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if (state == YAFFS_BLOCK_STATE_DEAD) {
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yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
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"block %d is bad", blk);
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} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
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yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
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dev->n_erased_blocks++;
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dev->n_free_chunks += dev->param.chunks_per_block;
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}
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bi++;
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}
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/* For each block.... */
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for (blk = dev->internal_start_block;
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!alloc_failed && blk <= dev->internal_end_block; blk++) {
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cond_resched();
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bi = yaffs_get_block_info(dev, blk);
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state = bi->block_state;
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deleted = 0;
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/* For each chunk in each block that needs scanning.... */
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for (c = 0;
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!alloc_failed && c < dev->param.chunks_per_block &&
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state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) {
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/* Read the tags and decide what to do */
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chunk = blk * dev->param.chunks_per_block + c;
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result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
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&tags);
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/* Let's have a good look at this chunk... */
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if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED ||
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tags.is_deleted) {
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/* YAFFS1 only...
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* A deleted chunk
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*/
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deleted++;
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dev->n_free_chunks++;
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} else if (!tags.chunk_used) {
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/* An unassigned chunk in the block
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* This means that either the block is empty or
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* this is the one being allocated from
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*/
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if (c == 0) {
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/* We're looking at the first chunk in
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*the block so the block is unused */
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state = YAFFS_BLOCK_STATE_EMPTY;
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dev->n_erased_blocks++;
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} else {
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/* this is the block being allocated */
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yaffs_trace(YAFFS_TRACE_SCAN,
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" Allocating from %d %d",
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blk, c);
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state = YAFFS_BLOCK_STATE_ALLOCATING;
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dev->alloc_block = blk;
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dev->alloc_page = c;
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dev->alloc_block_finder = blk;
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}
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dev->n_free_chunks +=
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(dev->param.chunks_per_block - c);
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} else if (tags.chunk_id > 0) {
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/* chunk_id > 0 so it is a data chunk... */
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unsigned int endpos;
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yaffs_set_chunk_bit(dev, blk, c);
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bi->pages_in_use++;
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in = yaffs_find_or_create_by_number(dev,
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tags.obj_id,
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YAFFS_OBJECT_TYPE_FILE);
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/* PutChunkIntoFile checks for a clash
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* (two data chunks with the same chunk_id).
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*/
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if (!in)
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alloc_failed = 1;
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if (in) {
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if (!yaffs_put_chunk_in_file
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(in, tags.chunk_id, chunk, 1))
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alloc_failed = 1;
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}
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endpos =
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(tags.chunk_id - 1) *
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dev->data_bytes_per_chunk +
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tags.n_bytes;
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if (in &&
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in->variant_type ==
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YAFFS_OBJECT_TYPE_FILE &&
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in->variant.file_variant.scanned_size <
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endpos) {
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in->variant.file_variant.scanned_size =
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endpos;
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if (!dev->param.use_header_file_size) {
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in->variant.
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file_variant.file_size =
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in->variant.
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file_variant.scanned_size;
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}
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}
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} else {
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/* chunk_id == 0, so it is an ObjectHeader.
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* Make the object
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*/
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yaffs_set_chunk_bit(dev, blk, c);
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bi->pages_in_use++;
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result = yaffs_rd_chunk_tags_nand(dev, chunk,
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chunk_data,
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NULL);
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oh = (struct yaffs_obj_hdr *)chunk_data;
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in = yaffs_find_by_number(dev, tags.obj_id);
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if (in && in->variant_type != oh->type) {
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/* This should not happen, but somehow
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* Wev'e ended up with an obj_id that
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* has been reused but not yet deleted,
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* and worse still it has changed type.
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* Delete the old object.
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*/
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yaffs_del_obj(in);
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in = NULL;
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}
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in = yaffs_find_or_create_by_number(dev,
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tags.obj_id,
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oh->type);
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if (!in)
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alloc_failed = 1;
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if (in && oh->shadows_obj > 0) {
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struct yaffs_shadow_fixer *fixer;
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fixer =
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kmalloc(sizeof
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(struct yaffs_shadow_fixer),
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GFP_NOFS);
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if (fixer) {
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fixer->next = shadow_fixers;
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shadow_fixers = fixer;
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fixer->obj_id = tags.obj_id;
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fixer->shadowed_id =
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oh->shadows_obj;
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yaffs_trace(YAFFS_TRACE_SCAN,
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" Shadow fixer: %d shadows %d",
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fixer->obj_id,
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fixer->shadowed_id);
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}
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}
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if (in && in->valid) {
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/* We have already filled this one.
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* We have a duplicate and need to
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* resolve it. */
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unsigned existing_serial = in->serial;
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unsigned new_serial =
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tags.serial_number;
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if (((existing_serial + 1) & 3) ==
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new_serial) {
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/* Use new one - destroy the
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* exisiting one */
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yaffs_chunk_del(dev,
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in->hdr_chunk,
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1, __LINE__);
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in->valid = 0;
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} else {
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/* Use existing - destroy
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* this one. */
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yaffs_chunk_del(dev, chunk, 1,
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__LINE__);
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}
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}
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if (in && !in->valid &&
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(tags.obj_id == YAFFS_OBJECTID_ROOT ||
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tags.obj_id ==
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YAFFS_OBJECTID_LOSTNFOUND)) {
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/* We only load some info, don't fiddle
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* with directory structure */
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in->valid = 1;
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in->variant_type = oh->type;
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in->yst_mode = oh->yst_mode;
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yaffs_load_attribs(in, oh);
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in->hdr_chunk = chunk;
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in->serial = tags.serial_number;
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} else if (in && !in->valid) {
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/* we need to load this info */
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in->valid = 1;
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in->variant_type = oh->type;
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in->yst_mode = oh->yst_mode;
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yaffs_load_attribs(in, oh);
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in->hdr_chunk = chunk;
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in->serial = tags.serial_number;
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yaffs_set_obj_name_from_oh(in, oh);
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in->dirty = 0;
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/* directory stuff...
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* hook up to parent
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*/
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parent =
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yaffs_find_or_create_by_number
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(dev, oh->parent_obj_id,
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YAFFS_OBJECT_TYPE_DIRECTORY);
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if (!parent)
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alloc_failed = 1;
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if (parent && parent->variant_type ==
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YAFFS_OBJECT_TYPE_UNKNOWN) {
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/* Set up as a directory */
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parent->variant_type =
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YAFFS_OBJECT_TYPE_DIRECTORY;
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INIT_LIST_HEAD(&parent->
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variant.dir_variant.
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children);
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} else if (!parent ||
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parent->variant_type !=
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YAFFS_OBJECT_TYPE_DIRECTORY) {
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/* Hoosterman, a problem....
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* We're trying to use a
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* non-directory as a directory
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*/
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yaffs_trace(YAFFS_TRACE_ERROR,
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"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
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);
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parent = dev->lost_n_found;
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}
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yaffs_add_obj_to_dir(parent, in);
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switch (in->variant_type) {
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case YAFFS_OBJECT_TYPE_UNKNOWN:
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/* Todo got a problem */
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break;
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case YAFFS_OBJECT_TYPE_FILE:
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if (dev->param.
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use_header_file_size)
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in->variant.
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file_variant.file_size
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= yaffs_oh_to_size(oh);
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break;
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case YAFFS_OBJECT_TYPE_HARDLINK:
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in->variant.
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hardlink_variant.equiv_id =
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oh->equiv_id;
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list_add(&in->hard_links,
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&hard_list);
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break;
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case YAFFS_OBJECT_TYPE_DIRECTORY:
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/* Do nothing */
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break;
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case YAFFS_OBJECT_TYPE_SPECIAL:
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/* Do nothing */
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break;
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case YAFFS_OBJECT_TYPE_SYMLINK:
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in->variant.symlink_variant.
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alias =
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yaffs_clone_str(oh->alias);
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if (!in->variant.
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symlink_variant.alias)
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alloc_failed = 1;
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break;
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}
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}
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}
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}
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if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
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/* If we got this far while scanning,
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* then the block is fully allocated. */
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state = YAFFS_BLOCK_STATE_FULL;
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}
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if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
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/* If the block was partially allocated then
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* treat it as fully allocated. */
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state = YAFFS_BLOCK_STATE_FULL;
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dev->alloc_block = -1;
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}
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bi->block_state = state;
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/* Now let's see if it was dirty */
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if (bi->pages_in_use == 0 &&
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!bi->has_shrink_hdr &&
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bi->block_state == YAFFS_BLOCK_STATE_FULL)
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yaffs_block_became_dirty(dev, blk);
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}
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/* Ok, we've done all the scanning.
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* Fix up the hard link chains.
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* We should now have scanned all the objects, now it's time to add
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* these hardlinks.
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*/
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yaffs_link_fixup(dev, &hard_list);
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/*
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* Fix up any shadowed objects.
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* There should not be more than one of these.
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*/
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{
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struct yaffs_shadow_fixer *fixer;
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struct yaffs_obj *obj;
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while (shadow_fixers) {
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fixer = shadow_fixers;
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shadow_fixers = fixer->next;
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/* Complete the rename transaction by deleting the
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* shadowed object then setting the object header
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to unshadowed.
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*/
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obj = yaffs_find_by_number(dev, fixer->shadowed_id);
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if (obj)
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yaffs_del_obj(obj);
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obj = yaffs_find_by_number(dev, fixer->obj_id);
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if (obj)
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yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
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kfree(fixer);
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}
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}
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yaffs_release_temp_buffer(dev, chunk_data);
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if (alloc_failed)
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return YAFFS_FAIL;
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yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
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return YAFFS_OK;
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}
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