/*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * Copyright (C) 2002 Aleph One Ltd.
+ * 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 1.2 2006-05-17 09:31:07 charles Exp $";
+ "$Id: yaffs_checkptrw.c,v 1.17 2008-08-12 22:51:57 charles Exp $";
#include "yaffs_checkptrw.h"
-
+#include "yaffs_getblockinfo.h"
static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
{
int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
-
- if(blocksAvailable < 0)
- blocksAvailable = 0;
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpt blocks available" TENDSTR)));
-
-
- if(blocksAvailable <= 0)
- return 0;
-
- return 1;
-}
+ 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)
+
+ if(!dev->eraseBlockInNAND)
return 0;
T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
- dev->startBlock,dev->endBlock));
-
- for(i = dev->startBlock; i <= dev->endBlock; i++) {
- yaffs_BlockInfo *bi = &dev->blockInfo[i];
+ 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)){
+ if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
dev->nErasedBlocks++;
dev->nFreeChunks += dev->nChunksPerBlock;
}
}
}
-
+
dev->blocksInCheckpoint = 0;
-
+
return 1;
}
{
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->endBlock &&
+ dev->checkpointNextBlock <= dev->internalEndBlock &&
blocksAvailable > 0){
-
- for(i = dev->checkpointNextBlock; i <= dev->endBlock; i++){
- yaffs_BlockInfo *bi = &dev->blockInfo[i];
+
+ 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->nErasedBlocks--;
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;
}
{
int i;
yaffs_ExtendedTags tags;
-
- if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
- for(i = dev->checkpointNextBlock; i <= dev->endBlock; i++){
+
+ 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));
- dev->readChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
-
if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
/* Right kind of block */
dev->checkpointNextBlock = tags.objectId;
int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
{
-
+
/* Got the functions we need? */
if (!dev->writeChunkWithTagsToNAND ||
!dev->readChunkWithTagsFromNAND ||
if(forWriting && !yaffs_CheckpointSpaceOk(dev))
return 0;
-
+
if(!dev->checkpointBuffer)
- dev->checkpointBuffer = YMALLOC(dev->nBytesPerChunk);
+ dev->checkpointBuffer = YMALLOC_DMA(dev->totalBytesPerChunk);
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->startBlock;
-
+ dev->checkpointNextBlock = dev->internalStartBlock;
+
/* Erase all the blocks in the checkpoint area */
if(forWriting){
- memset(dev->checkpointBuffer,0,dev->nBytesPerChunk);
+ 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->nBytesPerChunk;
+ 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->checkpointMaxBlocks = (dev->endBlock - dev->startBlock)/16 + 2;
+ 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;
}
{
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->nBytesPerChunk;
-
+ 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;
-
- dev->writeChunkWithTagsToNAND(dev,chunk,dev->checkpointBuffer,&tags);
+
+
+ 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->checkpointPageSequence++;
dev->checkpointCurrentChunk++;
if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
dev->checkpointCurrentChunk = 0;
dev->checkpointCurrentBlock = -1;
}
- memset(dev->checkpointBuffer,0,dev->nBytesPerChunk);
-
+ memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
+
return 1;
}
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->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
+ dev->checkpointSum += *dataBytes;
+ dev->checkpointXor ^= *dataBytes;
+
dev->checkpointByteOffset++;
i++;
dataBytes++;
dev->checkpointByteCount++;
-
-
+
+
if(dev->checkpointByteOffset < 0 ||
- dev->checkpointByteOffset >= dev->nBytesPerChunk)
+ dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
ok = yaffs_CheckpointFlushBuffer(dev);
}
-
+
return i;
}
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->nBytesPerChunk) {
-
+ 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 +
+
+ 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, chunk,
+ dev->readChunkWithTagsFromNAND(dev, realignedChunk,
dev->checkpointBuffer,
&tags);
-
+
if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
+ tags.eccResult > YAFFS_ECC_RESULT_FIXED ||
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->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 = &dev->blockInfo[dev->checkpointBlockList[i]];
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
else {
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 */
+ /* free the buffer */
YFREE(dev->checkpointBuffer);
dev->checkpointBuffer = NULL;
return 1;
}
else
return 0;
-
+
}
int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)