+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2007 Aleph One Ltd.
- * for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-const char *yaffs_checkptrw_c_version =
- "$Id: yaffs_checkptrw.c,v 1.14 2007-05-15 20:07:40 charles Exp $";
-
-
-#include "yaffs_checkptrw.h"
-
-
-static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
-{
-
- int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
-
- T(YAFFS_TRACE_CHECKPOINT,
- (TSTR("checkpt blocks available = %d" TENDSTR),
- blocksAvailable));
-
-
- return (blocksAvailable <= 0) ? 0 : 1;
-}
-
-
-static int yaffs_CheckpointErase(yaffs_Device *dev)
-{
-
- int i;
-
-
- if(!dev->eraseBlockInNAND)
- return 0;
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
- dev->internalStartBlock,dev->internalEndBlock));
-
- for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
- if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
- if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
- bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
- dev->nErasedBlocks++;
- dev->nFreeChunks += dev->nChunksPerBlock;
- }
- else {
- dev->markNANDBlockBad(dev,i);
- bi->blockState = YAFFS_BLOCK_STATE_DEAD;
- }
- }
- }
-
- dev->blocksInCheckpoint = 0;
-
- return 1;
-}
-
-
-static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
-{
- int i;
- int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
- T(YAFFS_TRACE_CHECKPOINT,
- (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
- dev->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
-
- if(dev->checkpointNextBlock >= 0 &&
- dev->checkpointNextBlock <= dev->internalEndBlock &&
- blocksAvailable > 0){
-
- for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
- if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
- dev->checkpointNextBlock = i + 1;
- dev->checkpointCurrentBlock = i;
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("allocating checkpt block %d"TENDSTR),i));
- return;
- }
- }
- }
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("out of checkpt blocks"TENDSTR)));
-
- dev->checkpointNextBlock = -1;
- dev->checkpointCurrentBlock = -1;
-}
-
-static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
-{
- int i;
- yaffs_ExtendedTags tags;
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
- dev->blocksInCheckpoint, dev->checkpointNextBlock));
-
- if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
- for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
- int chunk = i * dev->nChunksPerBlock;
- int realignedChunk = chunk - dev->chunkOffset;
-
- dev->readChunkWithTagsFromNAND(dev,realignedChunk,NULL,&tags);
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
- i, tags.objectId,tags.sequenceNumber,tags.eccResult));
-
- if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
- /* Right kind of block */
- dev->checkpointNextBlock = tags.objectId;
- dev->checkpointCurrentBlock = i;
- dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
- dev->blocksInCheckpoint++;
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
- return;
- }
- }
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
-
- dev->checkpointNextBlock = -1;
- dev->checkpointCurrentBlock = -1;
-}
-
-
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
-{
-
- /* Got the functions we need? */
- if (!dev->writeChunkWithTagsToNAND ||
- !dev->readChunkWithTagsFromNAND ||
- !dev->eraseBlockInNAND ||
- !dev->markNANDBlockBad)
- return 0;
-
- if(forWriting && !yaffs_CheckpointSpaceOk(dev))
- return 0;
-
- if(!dev->checkpointBuffer)
- dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
- if(!dev->checkpointBuffer)
- return 0;
-
-
- dev->checkpointPageSequence = 0;
-
- dev->checkpointOpenForWrite = forWriting;
-
- dev->checkpointByteCount = 0;
- dev->checkpointSum = 0;
- dev->checkpointXor = 0;
- dev->checkpointCurrentBlock = -1;
- dev->checkpointCurrentChunk = -1;
- dev->checkpointNextBlock = dev->internalStartBlock;
-
- /* Erase all the blocks in the checkpoint area */
- if(forWriting){
- memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
- dev->checkpointByteOffset = 0;
- return yaffs_CheckpointErase(dev);
-
-
- } else {
- int i;
- /* Set to a value that will kick off a read */
- dev->checkpointByteOffset = dev->nDataBytesPerChunk;
- /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
- * going to be way more than we need */
- dev->blocksInCheckpoint = 0;
- dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
- dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
- for(i = 0; i < dev->checkpointMaxBlocks; i++)
- dev->checkpointBlockList[i] = -1;
- }
-
- return 1;
-}
-
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
-{
- __u32 compositeSum;
- compositeSum = (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
- *sum = compositeSum;
- return 1;
-}
-
-static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
-{
-
- int chunk;
- int realignedChunk;
-
- yaffs_ExtendedTags tags;
-
- if(dev->checkpointCurrentBlock < 0){
- yaffs_CheckpointFindNextErasedBlock(dev);
- dev->checkpointCurrentChunk = 0;
- }
-
- if(dev->checkpointCurrentBlock < 0)
- return 0;
-
- tags.chunkDeleted = 0;
- tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
- tags.chunkId = dev->checkpointPageSequence + 1;
- tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
- tags.byteCount = dev->nDataBytesPerChunk;
- if(dev->checkpointCurrentChunk == 0){
- /* First chunk we write for the block? Set block state to
- checkpoint */
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
- bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
- dev->blocksInCheckpoint++;
- }
-
- chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
-
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
- chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
-
- realignedChunk = chunk - dev->chunkOffset;
-
- dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
- dev->checkpointByteOffset = 0;
- dev->checkpointPageSequence++;
- dev->checkpointCurrentChunk++;
- if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
- dev->checkpointCurrentChunk = 0;
- dev->checkpointCurrentBlock = -1;
- }
- memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
-
- return 1;
-}
-
-
-int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
-{
- int i=0;
- int ok = 1;
-
-
- __u8 * dataBytes = (__u8 *)data;
-
-
-
- if(!dev->checkpointBuffer)
- return 0;
-
- if(!dev->checkpointOpenForWrite)
- return -1;
-
- while(i < nBytes && ok) {
-
-
-
- dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
- dev->checkpointSum += *dataBytes;
- dev->checkpointXor ^= *dataBytes;
-
- dev->checkpointByteOffset++;
- i++;
- dataBytes++;
- dev->checkpointByteCount++;
-
-
- if(dev->checkpointByteOffset < 0 ||
- dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
- ok = yaffs_CheckpointFlushBuffer(dev);
-
- }
-
- return i;
-}
-
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
-{
- int i=0;
- int ok = 1;
- yaffs_ExtendedTags tags;
-
-
- int chunk;
- int realignedChunk;
-
- __u8 *dataBytes = (__u8 *)data;
-
- if(!dev->checkpointBuffer)
- return 0;
-
- if(dev->checkpointOpenForWrite)
- return -1;
-
- while(i < nBytes && ok) {
-
-
- if(dev->checkpointByteOffset < 0 ||
- dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
-
- if(dev->checkpointCurrentBlock < 0){
- yaffs_CheckpointFindNextCheckpointBlock(dev);
- dev->checkpointCurrentChunk = 0;
- }
-
- if(dev->checkpointCurrentBlock < 0)
- ok = 0;
- else {
-
- chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
- dev->checkpointCurrentChunk;
-
- realignedChunk = chunk - dev->chunkOffset;
-
- /* read in the next chunk */
- /* printf("read checkpoint page %d\n",dev->checkpointPage); */
- dev->readChunkWithTagsFromNAND(dev, realignedChunk,
- dev->checkpointBuffer,
- &tags);
-
- if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
- tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
- ok = 0;
-
- dev->checkpointByteOffset = 0;
- dev->checkpointPageSequence++;
- dev->checkpointCurrentChunk++;
-
- if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
- dev->checkpointCurrentBlock = -1;
- }
- }
-
- if(ok){
- *dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
- dev->checkpointSum += *dataBytes;
- dev->checkpointXor ^= *dataBytes;
- dev->checkpointByteOffset++;
- i++;
- dataBytes++;
- dev->checkpointByteCount++;
- }
- }
-
- return i;
-}
-
-int yaffs_CheckpointClose(yaffs_Device *dev)
-{
-
- if(dev->checkpointOpenForWrite){
- if(dev->checkpointByteOffset != 0)
- yaffs_CheckpointFlushBuffer(dev);
- } else {
- int i;
- for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
- if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
- bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
- else {
- // Todo this looks odd...
- }
- }
- YFREE(dev->checkpointBlockList);
- dev->checkpointBlockList = NULL;
- }
-
- dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
- dev->nErasedBlocks -= dev->blocksInCheckpoint;
-
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
- dev->checkpointByteCount));
-
- if(dev->checkpointBuffer){
- /* free the buffer */
- YFREE(dev->checkpointBuffer);
- dev->checkpointBuffer = NULL;
- return 1;
- }
- else
- return 0;
-
-}
-
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
-{
- /* Erase the first checksum block */
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
-
- if(!yaffs_CheckpointSpaceOk(dev))
- return 0;
-
- return yaffs_CheckpointErase(dev);
-}
-
-
-
projects / openwrt / openwrt.git / blobdiff