466 lines
12 KiB
C
466 lines
12 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) 2002-2010 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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int yaffs1_scan(yaffs_dev_t *dev)
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{
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yaffs_ext_tags tags;
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int blk;
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int blockIterator;
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int startIterator;
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int endIterator;
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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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yaffs_block_state_t state;
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yaffs_obj_t *hard_list = NULL;
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yaffs_block_info_t *bi;
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__u32 seq_number;
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yaffs_obj_header *oh;
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yaffs_obj_t *in;
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yaffs_obj_t *parent;
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int alloc_failed = 0;
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struct yaffs_shadow_fixer_s *shadowFixerList = NULL;
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__u8 *chunkData;
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T(YAFFS_TRACE_SCAN,
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(TSTR("yaffs1_scan starts intstartblk %d intendblk %d..." TENDSTR),
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dev->internal_start_block, dev->internal_end_block));
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chunkData = yaffs_get_temp_buffer(dev, __LINE__);
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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; 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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T(YAFFS_TRACE_SCAN_DEBUG,
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(TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
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state, seq_number));
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if (state == YAFFS_BLOCK_STATE_DEAD) {
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T(YAFFS_TRACE_BAD_BLOCKS,
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(TSTR("block %d is bad" TENDSTR), blk));
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} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
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T(YAFFS_TRACE_SCAN_DEBUG,
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(TSTR("Block empty " TENDSTR)));
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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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startIterator = dev->internal_start_block;
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endIterator = dev->internal_end_block;
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/* For each block.... */
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for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
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blockIterator++) {
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YYIELD();
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YYIELD();
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blk = blockIterator;
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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; !alloc_failed && c < dev->param.chunks_per_block &&
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state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; 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 || 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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/*T((" %d %d deleted\n",blk,c)); */
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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 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 from */
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T(YAFFS_TRACE_SCAN,
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(TSTR
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(" Allocating from %d %d" TENDSTR),
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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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/* Set block finder here to encourage the allocator to go forth from here. */
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}
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dev->n_free_chunks += (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.
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obj_id,
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YAFFS_OBJECT_TYPE_FILE);
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/* PutChunkIntoFile checks for a clash (two data chunks with
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* 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(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) * 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 == 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.
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scanned_size = endpos;
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if (!dev->param.use_header_file_size) {
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in->variant.file_variant.
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file_size =
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in->variant.file_variant.
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scanned_size;
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}
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}
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/* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id)); */
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} else {
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/* chunk_id == 0, so it is an ObjectHeader.
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* Thus, we read in the object header and 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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chunkData,
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NULL);
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oh = (yaffs_obj_header *) chunkData;
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in = yaffs_find_by_number(dev,
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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 has been reused but not yet
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* deleted, and worse still it has changed type. Delete the old object.
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*/
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yaffs_del_obj(in);
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in = 0;
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}
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in = yaffs_find_or_create_by_number(dev,
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tags.
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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_s *fixer;
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fixer = YMALLOC(sizeof(struct yaffs_shadow_fixer_s));
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if (fixer) {
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fixer->next = shadowFixerList;
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shadowFixerList = fixer;
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fixer->obj_id = tags.obj_id;
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fixer->shadowed_id = oh->shadows_obj;
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T(YAFFS_TRACE_SCAN,
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(TSTR
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(" Shadow fixer: %d shadows %d" TENDSTR),
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fixer->obj_id, 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. We have a duplicate and need to resolve it. */
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unsigned existingSerial = in->serial;
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unsigned newSerial = tags.serial_number;
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if (((existingSerial + 1) & 3) == newSerial) {
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/* Use new one - destroy the 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 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 == YAFFS_OBJECTID_LOSTNFOUND)) {
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/* We only load some info, don't fiddle 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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#ifdef CONFIG_YAFFS_WINCE
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in->win_atime[0] = oh->win_atime[0];
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in->win_ctime[0] = oh->win_ctime[0];
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in->win_mtime[0] = oh->win_mtime[0];
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in->win_atime[1] = oh->win_atime[1];
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in->win_ctime[1] = oh->win_ctime[1];
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in->win_mtime[1] = oh->win_mtime[1];
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#else
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in->yst_uid = oh->yst_uid;
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in->yst_gid = oh->yst_gid;
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in->yst_atime = oh->yst_atime;
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in->yst_mtime = oh->yst_mtime;
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in->yst_ctime = oh->yst_ctime;
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in->yst_rdev = oh->yst_rdev;
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#endif
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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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#ifdef CONFIG_YAFFS_WINCE
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in->win_atime[0] = oh->win_atime[0];
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in->win_ctime[0] = oh->win_ctime[0];
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in->win_mtime[0] = oh->win_mtime[0];
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in->win_atime[1] = oh->win_atime[1];
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in->win_ctime[1] = oh->win_ctime[1];
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in->win_mtime[1] = oh->win_mtime[1];
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#else
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in->yst_uid = oh->yst_uid;
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in->yst_gid = oh->yst_gid;
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in->yst_atime = oh->yst_atime;
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in->yst_mtime = oh->yst_mtime;
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in->yst_ctime = oh->yst_ctime;
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in->yst_rdev = oh->yst_rdev;
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#endif
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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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YINIT_LIST_HEAD(&parent->variant.
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dir_variant.
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children);
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} else if (!parent || parent->variant_type !=
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YAFFS_OBJECT_TYPE_DIRECTORY) {
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/* Hoosterman, another problem....
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* We're trying to use a non-directory as a directory
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*/
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T(YAFFS_TRACE_ERROR,
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(TSTR
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("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
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TENDSTR)));
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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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if (0 && (parent == dev->del_dir ||
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parent == dev->unlinked_dir)) {
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in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
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dev->n_deleted_files++;
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}
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/* Note re hardlinks.
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* Since we might scan a hardlink before its equivalent object is scanned
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* we put them all in a list.
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* After scanning is complete, we should have all the objects, so we run through this
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* list and fix up all the chains.
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*/
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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.use_header_file_size)
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in->variant.file_variant.
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file_size =
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oh->file_size;
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||
|
|
|
||
|
|
break;
|
||
|
|
case YAFFS_OBJECT_TYPE_HARDLINK:
|
||
|
|
in->variant.hardlink_variant.
|
||
|
|
equiv_id =
|
||
|
|
oh->equiv_id;
|
||
|
|
in->hard_links.next =
|
||
|
|
(struct ylist_head *)
|
||
|
|
hard_list;
|
||
|
|
hard_list = in;
|
||
|
|
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_SCANNING) {
|
||
|
|
/* 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 */
|
||
|
|
{
|
||
|
|
struct yaffs_shadow_fixer_s *fixer;
|
||
|
|
yaffs_obj_t *obj;
|
||
|
|
|
||
|
|
while (shadowFixerList) {
|
||
|
|
fixer = shadowFixerList;
|
||
|
|
shadowFixerList = 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);
|
||
|
|
|
||
|
|
YFREE(fixer);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
yaffs_release_temp_buffer(dev, chunkData, __LINE__);
|
||
|
|
|
||
|
|
if (alloc_failed)
|
||
|
|
return YAFFS_FAIL;
|
||
|
|
|
||
|
|
T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_scan ends" TENDSTR)));
|
||
|
|
|
||
|
|
|
||
|
|
return YAFFS_OK;
|
||
|
|
}
|
||
|
|
|