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405 lines
10 KiB
C
405 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) 2002-2007 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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const char *yaffs_checkptrw_c_version =
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"$Id: yaffs_checkptrw.c,v 1.14 2007-05-15 20:07:40 charles Exp $";
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#include "yaffs_checkptrw.h"
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static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
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{
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int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
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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_CheckpointErase(yaffs_Device *dev)
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{
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int i;
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if(!dev->eraseBlockInNAND)
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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->internalStartBlock,dev->internalEndBlock));
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for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
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yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
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if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
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T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
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if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
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bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
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dev->nErasedBlocks++;
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dev->nFreeChunks += dev->nChunksPerBlock;
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}
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else {
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dev->markNANDBlockBad(dev,i);
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bi->blockState = YAFFS_BLOCK_STATE_DEAD;
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}
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}
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}
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dev->blocksInCheckpoint = 0;
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return 1;
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}
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static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
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{
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int i;
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int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
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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->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
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if(dev->checkpointNextBlock >= 0 &&
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dev->checkpointNextBlock <= dev->internalEndBlock &&
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blocksAvailable > 0){
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for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
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yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
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if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
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dev->checkpointNextBlock = i + 1;
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dev->checkpointCurrentBlock = 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->checkpointNextBlock = -1;
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dev->checkpointCurrentBlock = -1;
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}
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static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
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{
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int i;
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yaffs_ExtendedTags 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->blocksInCheckpoint, dev->checkpointNextBlock));
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if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
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for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
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int chunk = i * dev->nChunksPerBlock;
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int realignedChunk = chunk - dev->chunkOffset;
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dev->readChunkWithTagsFromNAND(dev,realignedChunk,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.objectId,tags.sequenceNumber,tags.eccResult));
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if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
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/* Right kind of block */
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dev->checkpointNextBlock = tags.objectId;
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dev->checkpointCurrentBlock = i;
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dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
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dev->blocksInCheckpoint++;
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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->checkpointNextBlock = -1;
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dev->checkpointCurrentBlock = -1;
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}
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int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
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{
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/* Got the functions we need? */
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if (!dev->writeChunkWithTagsToNAND ||
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!dev->readChunkWithTagsFromNAND ||
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!dev->eraseBlockInNAND ||
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!dev->markNANDBlockBad)
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return 0;
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if(forWriting && !yaffs_CheckpointSpaceOk(dev))
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return 0;
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if(!dev->checkpointBuffer)
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dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
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if(!dev->checkpointBuffer)
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return 0;
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dev->checkpointPageSequence = 0;
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dev->checkpointOpenForWrite = forWriting;
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dev->checkpointByteCount = 0;
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dev->checkpointSum = 0;
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dev->checkpointXor = 0;
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dev->checkpointCurrentBlock = -1;
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dev->checkpointCurrentChunk = -1;
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dev->checkpointNextBlock = dev->internalStartBlock;
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/* Erase all the blocks in the checkpoint area */
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if(forWriting){
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memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
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dev->checkpointByteOffset = 0;
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return yaffs_CheckpointErase(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->checkpointByteOffset = dev->nDataBytesPerChunk;
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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->blocksInCheckpoint = 0;
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dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
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dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
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for(i = 0; i < dev->checkpointMaxBlocks; i++)
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dev->checkpointBlockList[i] = -1;
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}
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return 1;
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}
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int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
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{
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__u32 compositeSum;
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compositeSum = (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
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*sum = compositeSum;
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return 1;
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}
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static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
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{
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int chunk;
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int realignedChunk;
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yaffs_ExtendedTags tags;
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if(dev->checkpointCurrentBlock < 0){
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yaffs_CheckpointFindNextErasedBlock(dev);
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dev->checkpointCurrentChunk = 0;
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}
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if(dev->checkpointCurrentBlock < 0)
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return 0;
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tags.chunkDeleted = 0;
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tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
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tags.chunkId = dev->checkpointPageSequence + 1;
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tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
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tags.byteCount = dev->nDataBytesPerChunk;
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if(dev->checkpointCurrentChunk == 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_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
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bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
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dev->blocksInCheckpoint++;
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}
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chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
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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->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
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realignedChunk = chunk - dev->chunkOffset;
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dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
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dev->checkpointByteOffset = 0;
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dev->checkpointPageSequence++;
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dev->checkpointCurrentChunk++;
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if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
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dev->checkpointCurrentChunk = 0;
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dev->checkpointCurrentBlock = -1;
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}
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memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
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return 1;
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}
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int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
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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->checkpointBuffer)
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return 0;
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if(!dev->checkpointOpenForWrite)
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return -1;
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while(i < nBytes && ok) {
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dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
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dev->checkpointSum += *dataBytes;
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dev->checkpointXor ^= *dataBytes;
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dev->checkpointByteOffset++;
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i++;
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dataBytes++;
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dev->checkpointByteCount++;
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if(dev->checkpointByteOffset < 0 ||
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dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
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ok = yaffs_CheckpointFlushBuffer(dev);
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}
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return i;
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}
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int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
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{
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int i=0;
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int ok = 1;
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yaffs_ExtendedTags 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->checkpointBuffer)
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return 0;
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if(dev->checkpointOpenForWrite)
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return -1;
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while(i < nBytes && ok) {
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if(dev->checkpointByteOffset < 0 ||
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dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
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if(dev->checkpointCurrentBlock < 0){
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yaffs_CheckpointFindNextCheckpointBlock(dev);
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dev->checkpointCurrentChunk = 0;
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}
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if(dev->checkpointCurrentBlock < 0)
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ok = 0;
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else {
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chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
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dev->checkpointCurrentChunk;
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realignedChunk = chunk - dev->chunkOffset;
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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->readChunkWithTagsFromNAND(dev, realignedChunk,
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dev->checkpointBuffer,
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&tags);
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if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
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tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
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ok = 0;
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dev->checkpointByteOffset = 0;
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dev->checkpointPageSequence++;
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dev->checkpointCurrentChunk++;
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if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
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dev->checkpointCurrentBlock = -1;
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}
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}
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if(ok){
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*dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
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dev->checkpointSum += *dataBytes;
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dev->checkpointXor ^= *dataBytes;
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dev->checkpointByteOffset++;
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i++;
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dataBytes++;
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dev->checkpointByteCount++;
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}
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}
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return i;
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}
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int yaffs_CheckpointClose(yaffs_Device *dev)
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{
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if(dev->checkpointOpenForWrite){
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if(dev->checkpointByteOffset != 0)
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yaffs_CheckpointFlushBuffer(dev);
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} else {
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int i;
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for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
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yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
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if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
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bi->blockState = 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->checkpointBlockList);
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dev->checkpointBlockList = NULL;
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}
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dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
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dev->nErasedBlocks -= dev->blocksInCheckpoint;
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T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
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dev->checkpointByteCount));
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if(dev->checkpointBuffer){
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/* free the buffer */
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YFREE(dev->checkpointBuffer);
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dev->checkpointBuffer = NULL;
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return 1;
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}
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else
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return 0;
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}
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int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
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{
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/* Erase the first checksum block */
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T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
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if(!yaffs_CheckpointSpaceOk(dev))
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return 0;
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return yaffs_CheckpointErase(dev);
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}
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