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git://projects.qi-hardware.com/openwrt-xburst.git
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34b60fad1a
Signed-off-by: Gabor Juhos <juhosg@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34013 3c298f89-4303-0410-b956-a3cf2f4a3e73
402 lines
10 KiB
C
402 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) 2002-2010 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_checkptrw.h"
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#include "yaffs_getblockinfo.h"
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static int yaffs2_checkpt_space_ok(yaffs_dev_t *dev)
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{
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int blocksAvailable = dev->n_erased_blocks - dev->param.n_reserved_blocks;
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T(YAFFS_TRACE_CHECKPOINT,
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(TSTR("checkpt blocks available = %d" TENDSTR),
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blocksAvailable));
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return (blocksAvailable <= 0) ? 0 : 1;
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}
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static int yaffs_checkpt_erase(yaffs_dev_t *dev)
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{
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int i;
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if (!dev->param.erase_fn)
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return 0;
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR),
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dev->internal_start_block, dev->internal_end_block));
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for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
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yaffs_block_info_t *bi = yaffs_get_block_info(dev, i);
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if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i));
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dev->n_erasures++;
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if (dev->param.erase_fn(dev, i - dev->block_offset /* realign */)) {
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bi->block_state = YAFFS_BLOCK_STATE_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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} else {
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dev->param.bad_block_fn(dev, i);
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bi->block_state = YAFFS_BLOCK_STATE_DEAD;
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}
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}
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}
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dev->blocks_in_checkpt = 0;
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return 1;
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}
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static void yaffs2_checkpt_find_erased_block(yaffs_dev_t *dev)
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{
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int i;
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int blocksAvailable = dev->n_erased_blocks - dev->param.n_reserved_blocks;
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T(YAFFS_TRACE_CHECKPOINT,
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(TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
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dev->n_erased_blocks, dev->param.n_reserved_blocks, blocksAvailable, dev->checkpt_next_block));
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if (dev->checkpt_next_block >= 0 &&
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dev->checkpt_next_block <= dev->internal_end_block &&
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blocksAvailable > 0) {
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for (i = dev->checkpt_next_block; i <= dev->internal_end_block; i++) {
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yaffs_block_info_t *bi = yaffs_get_block_info(dev, i);
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if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
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dev->checkpt_next_block = i + 1;
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dev->checkpt_cur_block = i;
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("allocating checkpt block %d"TENDSTR), i));
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return;
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}
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}
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}
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("out of checkpt blocks"TENDSTR)));
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dev->checkpt_next_block = -1;
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dev->checkpt_cur_block = -1;
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}
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static void yaffs2_checkpt_find_block(yaffs_dev_t *dev)
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{
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int i;
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yaffs_ext_tags tags;
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
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dev->blocks_in_checkpt, dev->checkpt_next_block));
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if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
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for (i = dev->checkpt_next_block; i <= dev->internal_end_block; i++) {
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int chunk = i * dev->param.chunks_per_block;
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int realignedChunk = chunk - dev->chunk_offset;
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dev->param.read_chunk_tags_fn(dev, realignedChunk,
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NULL, &tags);
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
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i, tags.obj_id, tags.seq_number, tags.ecc_result));
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if (tags.seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA) {
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/* Right kind of block */
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dev->checkpt_next_block = tags.obj_id;
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dev->checkpt_cur_block = i;
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dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
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dev->blocks_in_checkpt++;
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("found checkpt block %d"TENDSTR), i));
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return;
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}
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}
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("found no more checkpt blocks"TENDSTR)));
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dev->checkpt_next_block = -1;
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dev->checkpt_cur_block = -1;
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}
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int yaffs2_checkpt_open(yaffs_dev_t *dev, int forWriting)
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{
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dev->checkpt_open_write = forWriting;
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/* Got the functions we need? */
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if (!dev->param.write_chunk_tags_fn ||
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!dev->param.read_chunk_tags_fn ||
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!dev->param.erase_fn ||
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!dev->param.bad_block_fn)
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return 0;
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if (forWriting && !yaffs2_checkpt_space_ok(dev))
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return 0;
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if (!dev->checkpt_buffer)
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dev->checkpt_buffer = YMALLOC_DMA(dev->param.total_bytes_per_chunk);
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if (!dev->checkpt_buffer)
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return 0;
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dev->checkpt_page_seq = 0;
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dev->checkpt_byte_count = 0;
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dev->checkpt_sum = 0;
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dev->checkpt_xor = 0;
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dev->checkpt_cur_block = -1;
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dev->checkpt_cur_chunk = -1;
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dev->checkpt_next_block = dev->internal_start_block;
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/* Erase all the blocks in the checkpoint area */
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if (forWriting) {
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memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
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dev->checkpt_byte_offs = 0;
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return yaffs_checkpt_erase(dev);
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} else {
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int i;
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/* Set to a value that will kick off a read */
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dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
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/* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
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* going to be way more than we need */
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dev->blocks_in_checkpt = 0;
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dev->checkpt_max_blocks = (dev->internal_end_block - dev->internal_start_block)/16 + 2;
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dev->checkpt_block_list = YMALLOC(sizeof(int) * dev->checkpt_max_blocks);
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if(!dev->checkpt_block_list)
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return 0;
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for (i = 0; i < dev->checkpt_max_blocks; i++)
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dev->checkpt_block_list[i] = -1;
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}
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return 1;
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}
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int yaffs2_get_checkpt_sum(yaffs_dev_t *dev, __u32 *sum)
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{
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__u32 compositeSum;
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compositeSum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xFF);
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*sum = compositeSum;
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return 1;
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}
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static int yaffs2_checkpt_flush_buffer(yaffs_dev_t *dev)
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{
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int chunk;
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int realignedChunk;
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yaffs_ext_tags tags;
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if (dev->checkpt_cur_block < 0) {
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yaffs2_checkpt_find_erased_block(dev);
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dev->checkpt_cur_chunk = 0;
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}
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if (dev->checkpt_cur_block < 0)
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return 0;
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tags.is_deleted = 0;
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tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */
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tags.chunk_id = dev->checkpt_page_seq + 1;
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tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
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tags.n_bytes = dev->data_bytes_per_chunk;
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if (dev->checkpt_cur_chunk == 0) {
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/* First chunk we write for the block? Set block state to
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checkpoint */
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yaffs_block_info_t *bi = yaffs_get_block_info(dev, dev->checkpt_cur_block);
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bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
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dev->blocks_in_checkpt++;
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}
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chunk = dev->checkpt_cur_block * dev->param.chunks_per_block + dev->checkpt_cur_chunk;
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
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chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk, tags.obj_id, tags.chunk_id));
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realignedChunk = chunk - dev->chunk_offset;
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dev->n_page_writes++;
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dev->param.write_chunk_tags_fn(dev, realignedChunk,
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dev->checkpt_buffer, &tags);
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dev->checkpt_byte_offs = 0;
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dev->checkpt_page_seq++;
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dev->checkpt_cur_chunk++;
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if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
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dev->checkpt_cur_chunk = 0;
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dev->checkpt_cur_block = -1;
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}
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memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
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return 1;
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}
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int yaffs2_checkpt_wr(yaffs_dev_t *dev, const void *data, int n_bytes)
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{
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int i = 0;
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int ok = 1;
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__u8 * dataBytes = (__u8 *)data;
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if (!dev->checkpt_buffer)
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return 0;
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if (!dev->checkpt_open_write)
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return -1;
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while (i < n_bytes && ok) {
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dev->checkpt_buffer[dev->checkpt_byte_offs] = *dataBytes;
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dev->checkpt_sum += *dataBytes;
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dev->checkpt_xor ^= *dataBytes;
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dev->checkpt_byte_offs++;
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i++;
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dataBytes++;
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dev->checkpt_byte_count++;
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if (dev->checkpt_byte_offs < 0 ||
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dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
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ok = yaffs2_checkpt_flush_buffer(dev);
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}
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return i;
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}
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int yaffs2_checkpt_rd(yaffs_dev_t *dev, void *data, int n_bytes)
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{
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int i = 0;
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int ok = 1;
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yaffs_ext_tags tags;
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int chunk;
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int realignedChunk;
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__u8 *dataBytes = (__u8 *)data;
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if (!dev->checkpt_buffer)
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return 0;
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if (dev->checkpt_open_write)
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return -1;
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while (i < n_bytes && ok) {
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if (dev->checkpt_byte_offs < 0 ||
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dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
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if (dev->checkpt_cur_block < 0) {
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yaffs2_checkpt_find_block(dev);
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dev->checkpt_cur_chunk = 0;
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}
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if (dev->checkpt_cur_block < 0)
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ok = 0;
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else {
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chunk = dev->checkpt_cur_block *
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dev->param.chunks_per_block +
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dev->checkpt_cur_chunk;
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realignedChunk = chunk - dev->chunk_offset;
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dev->n_page_reads++;
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/* read in the next chunk */
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/* printf("read checkpoint page %d\n",dev->checkpointPage); */
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dev->param.read_chunk_tags_fn(dev,
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realignedChunk,
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dev->checkpt_buffer,
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&tags);
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if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||
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tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
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tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
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ok = 0;
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dev->checkpt_byte_offs = 0;
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dev->checkpt_page_seq++;
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dev->checkpt_cur_chunk++;
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if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block)
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dev->checkpt_cur_block = -1;
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}
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}
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if (ok) {
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*dataBytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
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dev->checkpt_sum += *dataBytes;
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dev->checkpt_xor ^= *dataBytes;
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dev->checkpt_byte_offs++;
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i++;
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dataBytes++;
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dev->checkpt_byte_count++;
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}
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}
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return i;
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}
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int yaffs_checkpt_close(yaffs_dev_t *dev)
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{
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if (dev->checkpt_open_write) {
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if (dev->checkpt_byte_offs != 0)
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yaffs2_checkpt_flush_buffer(dev);
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} else if(dev->checkpt_block_list){
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int i;
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for (i = 0; i < dev->blocks_in_checkpt && dev->checkpt_block_list[i] >= 0; i++) {
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int blk = dev->checkpt_block_list[i];
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yaffs_block_info_t *bi = NULL;
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if( dev->internal_start_block <= blk && blk <= dev->internal_end_block)
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bi = yaffs_get_block_info(dev, blk);
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if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
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bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
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else {
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/* Todo this looks odd... */
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}
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}
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YFREE(dev->checkpt_block_list);
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dev->checkpt_block_list = NULL;
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}
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dev->n_free_chunks -= dev->blocks_in_checkpt * dev->param.chunks_per_block;
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dev->n_erased_blocks -= dev->blocks_in_checkpt;
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint byte count %d" TENDSTR),
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dev->checkpt_byte_count));
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if (dev->checkpt_buffer) {
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/* free the buffer */
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YFREE(dev->checkpt_buffer);
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dev->checkpt_buffer = NULL;
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return 1;
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} else
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return 0;
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}
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int yaffs2_checkpt_invalidate_stream(yaffs_dev_t *dev)
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{
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/* Erase the checkpoint data */
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T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
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dev->blocks_in_checkpt));
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return yaffs_checkpt_erase(dev);
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}
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