409 lines
10 KiB
C
409 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_checkptrw.h"
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#include "yaffs_getblockinfo.h"
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static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
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{
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int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"checkpt blocks_avail = %d", blocks_avail);
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return (blocks_avail <= 0) ? 0 : 1;
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}
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static int yaffs_checkpt_erase(struct yaffs_dev *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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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"checking blocks %d to %d",
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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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struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
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if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"erasing checkpt block %d", i);
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dev->n_erasures++;
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if (dev->param.
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erase_fn(dev,
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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 +=
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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(struct yaffs_dev *dev)
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{
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int i;
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int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"allocating checkpt block: erased %d reserved %d avail %d next %d ",
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dev->n_erased_blocks, dev->param.n_reserved_blocks,
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blocks_avail, 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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blocks_avail > 0) {
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for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
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i++) {
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struct yaffs_block_info *bi =
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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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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"allocating checkpt block %d", i);
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return;
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}
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}
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}
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yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
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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(struct yaffs_dev *dev)
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{
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int i;
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struct yaffs_ext_tags tags;
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"find next checkpt block: start: blocks %d next %d",
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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;
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i++) {
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int chunk = i * dev->param.chunks_per_block;
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int realigned_chunk = chunk - dev->chunk_offset;
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dev->param.read_chunk_tags_fn(dev, realigned_chunk,
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NULL, &tags);
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"find next checkpt block: search: block %d oid %d seq %d eccr %d",
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i, tags.obj_id, tags.seq_number,
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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->
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blocks_in_checkpt] = i;
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dev->blocks_in_checkpt++;
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"found checkpt block %d", i);
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return;
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}
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}
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yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
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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(struct yaffs_dev *dev, int writing)
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{
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int i;
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dev->checkpt_open_write = writing;
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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 || !dev->param.bad_block_fn)
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return 0;
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if (writing && !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 =
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kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
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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 (writing) {
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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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}
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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
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* (hopefully) 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 =
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(dev->internal_end_block - dev->internal_start_block) / 16 + 2;
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dev->checkpt_block_list =
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kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
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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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return 1;
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}
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int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
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{
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u32 composite_sum;
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composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);
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*sum = composite_sum;
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return 1;
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}
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static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
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{
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int chunk;
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int realigned_chunk;
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struct 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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struct yaffs_block_info *bi =
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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 =
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dev->checkpt_cur_block * dev->param.chunks_per_block +
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dev->checkpt_cur_chunk;
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
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chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
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tags.obj_id, tags.chunk_id);
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realigned_chunk = chunk - dev->chunk_offset;
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dev->n_page_writes++;
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dev->param.write_chunk_tags_fn(dev, realigned_chunk,
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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(struct yaffs_dev *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 *data_bytes = (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] = *data_bytes;
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dev->checkpt_sum += *data_bytes;
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dev->checkpt_xor ^= *data_bytes;
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dev->checkpt_byte_offs++;
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i++;
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data_bytes++;
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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(struct yaffs_dev *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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struct yaffs_ext_tags tags;
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int chunk;
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int realigned_chunk;
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u8 *data_bytes = (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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break;
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}
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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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realigned_chunk = 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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dev->param.read_chunk_tags_fn(dev,
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realigned_chunk,
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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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break;
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}
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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 >=
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dev->param.chunks_per_block)
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dev->checkpt_cur_block = -1;
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}
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*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
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dev->checkpt_sum += *data_bytes;
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dev->checkpt_xor ^= *data_bytes;
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dev->checkpt_byte_offs++;
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i++;
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data_bytes++;
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dev->checkpt_byte_count++;
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}
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return i;
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}
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int yaffs_checkpt_close(struct yaffs_dev *dev)
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{
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int i;
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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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for (i = 0;
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i < dev->blocks_in_checkpt &&
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dev->checkpt_block_list[i] >= 0; i++) {
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int blk = dev->checkpt_block_list[i];
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struct yaffs_block_info *bi = NULL;
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if (dev->internal_start_block <= blk &&
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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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}
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kfree(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 -=
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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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yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d",
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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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kfree(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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}
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int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
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{
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/* Erase the checkpoint data */
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yaffs_trace(YAFFS_TRACE_CHECKPOINT,
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"checkpoint invalidate of %d blocks",
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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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