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55283635a0
The summary already has other verification. This one is not needed. The check caused summaries to be ignored if they were not on the numbered block. This caused problems when a summary was embedded in an image and the image is written to a flash with bad blocks. Signed-off-by: Charles Manning <cdhmanning@gmail.com>
309 lines
8.1 KiB
C
309 lines
8.1 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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/* Summaries write the useful part of the tags for the chunks in a block into an
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* an array which is written to the last n chunks of the block.
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* Reading the summaries gives all the tags for the block in one read. Much
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* faster.
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*
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* Chunks holding summaries are marked with tags making it look like
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* they are part of a fake file.
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*
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* The summary could also be used during gc.
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*
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*/
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#include "yaffs_summary.h"
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#include "yaffs_packedtags2.h"
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#include "yaffs_nand.h"
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#include "yaffs_getblockinfo.h"
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#include "yaffs_bitmap.h"
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/*
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* The summary is built up in an array of summary tags.
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* This gets written to the last one or two (maybe more) chunks in a block.
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* A summary header is written as the first part of each chunk of summary data.
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* The summary header must match or the summary is rejected.
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*/
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/* Summary tags don't need the sequence number because that is redundant. */
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struct yaffs_summary_tags {
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unsigned obj_id;
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unsigned chunk_id;
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unsigned n_bytes;
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};
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/* Summary header */
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struct yaffs_summary_header {
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unsigned version; /* Must match current version */
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unsigned block; /* Must be this block */
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unsigned seq; /* Must be this sequence number */
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unsigned sum; /* Just add up all the bytes in the tags */
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};
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static void yaffs_summary_clear(struct yaffs_dev *dev)
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{
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if (!dev->sum_tags)
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return;
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memset(dev->sum_tags, 0, dev->chunks_per_summary *
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sizeof(struct yaffs_summary_tags));
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}
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void yaffs_summary_deinit(struct yaffs_dev *dev)
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{
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kfree(dev->sum_tags);
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dev->sum_tags = NULL;
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kfree(dev->gc_sum_tags);
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dev->gc_sum_tags = NULL;
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dev->chunks_per_summary = 0;
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}
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int yaffs_summary_init(struct yaffs_dev *dev)
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{
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int sum_bytes;
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int chunks_used; /* Number of chunks used by summary */
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int sum_tags_bytes;
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sum_bytes = dev->param.chunks_per_block *
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sizeof(struct yaffs_summary_tags);
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chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/
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(dev->data_bytes_per_chunk -
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sizeof(struct yaffs_summary_header));
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dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used;
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sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
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dev->chunks_per_summary;
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dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
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dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
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if (!dev->sum_tags || !dev->gc_sum_tags) {
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yaffs_summary_deinit(dev);
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return YAFFS_FAIL;
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}
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yaffs_summary_clear(dev);
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return YAFFS_OK;
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}
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static unsigned yaffs_summary_sum(struct yaffs_dev *dev)
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{
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u8 *sum_buffer = (u8 *)dev->sum_tags;
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int i;
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unsigned sum = 0;
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i = sizeof(struct yaffs_summary_tags) *
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dev->chunks_per_summary;
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while (i > 0) {
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sum += *sum_buffer;
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sum_buffer++;
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i--;
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}
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return sum;
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}
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static int yaffs_summary_write(struct yaffs_dev *dev, int blk)
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{
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struct yaffs_ext_tags tags;
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u8 *buffer;
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u8 *sum_buffer = (u8 *)dev->sum_tags;
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int n_bytes;
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int chunk_in_nand;
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int chunk_in_block;
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int result;
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int this_tx;
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struct yaffs_summary_header hdr;
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int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
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struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
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buffer = yaffs_get_temp_buffer(dev);
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n_bytes = sizeof(struct yaffs_summary_tags) *
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dev->chunks_per_summary;
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memset(&tags, 0, sizeof(struct yaffs_ext_tags));
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tags.obj_id = YAFFS_OBJECTID_SUMMARY;
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tags.chunk_id = 1;
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chunk_in_block = dev->chunks_per_summary;
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chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block +
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dev->chunks_per_summary;
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hdr.version = YAFFS_SUMMARY_VERSION;
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hdr.block = blk;
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hdr.seq = bi->seq_number;
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hdr.sum = yaffs_summary_sum(dev);
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do {
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this_tx = n_bytes;
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if (this_tx > sum_bytes_per_chunk)
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this_tx = sum_bytes_per_chunk;
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memcpy(buffer, &hdr, sizeof(hdr));
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memcpy(buffer + sizeof(hdr), sum_buffer, this_tx);
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tags.n_bytes = this_tx + sizeof(hdr);
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result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand,
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buffer, &tags);
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if (result != YAFFS_OK)
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break;
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yaffs_set_chunk_bit(dev, blk, chunk_in_block);
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bi->pages_in_use++;
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dev->n_free_chunks--;
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n_bytes -= this_tx;
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sum_buffer += this_tx;
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chunk_in_nand++;
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chunk_in_block++;
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tags.chunk_id++;
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} while (result == YAFFS_OK && n_bytes > 0);
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yaffs_release_temp_buffer(dev, buffer);
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if (result == YAFFS_OK)
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bi->has_summary = 1;
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return result;
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}
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int yaffs_summary_read(struct yaffs_dev *dev,
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struct yaffs_summary_tags *st,
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int blk)
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{
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struct yaffs_ext_tags tags;
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u8 *buffer;
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u8 *sum_buffer = (u8 *)st;
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int n_bytes;
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int chunk_id;
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int chunk_in_nand;
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int chunk_in_block;
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int result;
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int this_tx;
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struct yaffs_summary_header hdr;
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struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
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int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
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buffer = yaffs_get_temp_buffer(dev);
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n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary;
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chunk_in_block = dev->chunks_per_summary;
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chunk_in_nand = blk * dev->param.chunks_per_block +
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dev->chunks_per_summary;
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chunk_id = 1;
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do {
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this_tx = n_bytes;
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if (this_tx > sum_bytes_per_chunk)
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this_tx = sum_bytes_per_chunk;
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result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand,
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buffer, &tags);
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if (tags.chunk_id != chunk_id ||
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tags.obj_id != YAFFS_OBJECTID_SUMMARY ||
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tags.chunk_used == 0 ||
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tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
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tags.n_bytes != (this_tx + sizeof(hdr)))
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result = YAFFS_FAIL;
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if (result != YAFFS_OK)
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break;
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if (st == dev->sum_tags) {
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/* If we're scanning then update the block info */
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yaffs_set_chunk_bit(dev, blk, chunk_in_block);
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bi->pages_in_use++;
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}
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memcpy(&hdr, buffer, sizeof(hdr));
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memcpy(sum_buffer, buffer + sizeof(hdr), this_tx);
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n_bytes -= this_tx;
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sum_buffer += this_tx;
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chunk_in_nand++;
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chunk_in_block++;
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chunk_id++;
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} while (result == YAFFS_OK && n_bytes > 0);
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yaffs_release_temp_buffer(dev, buffer);
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if (result == YAFFS_OK) {
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/* Verify header */
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if (hdr.version != YAFFS_SUMMARY_VERSION ||
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hdr.seq != bi->seq_number ||
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hdr.sum != yaffs_summary_sum(dev))
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result = YAFFS_FAIL;
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}
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if (st == dev->sum_tags && result == YAFFS_OK)
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bi->has_summary = 1;
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return result;
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}
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int yaffs_summary_add(struct yaffs_dev *dev,
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struct yaffs_ext_tags *tags,
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int chunk_in_nand)
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{
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struct yaffs_packed_tags2_tags_only tags_only;
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struct yaffs_summary_tags *sum_tags;
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int block_in_nand = chunk_in_nand / dev->param.chunks_per_block;
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int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block;
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if (!dev->sum_tags)
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return YAFFS_OK;
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if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
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yaffs_pack_tags2_tags_only(&tags_only, tags);
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sum_tags = &dev->sum_tags[chunk_in_block];
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sum_tags->chunk_id = tags_only.chunk_id;
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sum_tags->n_bytes = tags_only.n_bytes;
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sum_tags->obj_id = tags_only.obj_id;
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if (chunk_in_block == dev->chunks_per_summary - 1) {
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/* Time to write out the summary */
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yaffs_summary_write(dev, block_in_nand);
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yaffs_summary_clear(dev);
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yaffs_skip_rest_of_block(dev);
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}
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}
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return YAFFS_OK;
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}
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int yaffs_summary_fetch(struct yaffs_dev *dev,
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struct yaffs_ext_tags *tags,
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int chunk_in_block)
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{
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struct yaffs_packed_tags2_tags_only tags_only;
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struct yaffs_summary_tags *sum_tags;
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if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
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sum_tags = &dev->sum_tags[chunk_in_block];
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tags_only.chunk_id = sum_tags->chunk_id;
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tags_only.n_bytes = sum_tags->n_bytes;
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tags_only.obj_id = sum_tags->obj_id;
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yaffs_unpack_tags2_tags_only(tags, &tags_only);
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return YAFFS_OK;
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}
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return YAFFS_FAIL;
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}
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void yaffs_summary_gc(struct yaffs_dev *dev, int blk)
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{
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struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
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int i;
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if (!bi->has_summary)
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return;
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for (i = dev->chunks_per_summary;
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i < dev->param.chunks_per_block;
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i++) {
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if (yaffs_check_chunk_bit(dev, blk, i)) {
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yaffs_clear_chunk_bit(dev, blk, i);
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bi->pages_in_use--;
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dev->n_free_chunks++;
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}
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}
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}
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