/*
- * 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) 2002-2010 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 1.1 2006-05-08 10:13:34 charles Exp $";
+#include "yaffs_checkptrw.h"
+#include "yaffs_getblockinfo.h"
+static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+{
+ int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
-#include "yaffs_checkptrw.h"
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("checkpt blocks available = %d" TENDSTR),
+ blocksAvailable));
+
+ return (blocksAvailable <= 0) ? 0 : 1;
+}
-int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+static int yaffs_CheckpointErase(yaffs_Device *dev)
{
+ int i;
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpt blocks %d %d %d %d" TENDSTR),
- dev->checkpointStartBlock, dev->checkpointEndBlock,
- dev->startBlock,dev->endBlock));
-
- if(dev->checkpointStartBlock >= dev->checkpointEndBlock)
+ if (!dev->param.eraseBlockInNAND)
return 0;
-
- if(dev->checkpointStartBlock >= dev->startBlock &&
- dev->checkpointStartBlock <= dev->endBlock)
- return 0;
-
- if(dev->checkpointEndBlock >= dev->startBlock &&
- dev->checkpointEndBlock <= dev->endBlock)
- 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));
+
+ dev->nBlockErasures++;
+
+ if (dev->param.eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
+ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ dev->nFreeChunks += dev->param.nChunksPerBlock;
+ } else {
+ dev->param.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->param.nReservedBlocks;
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
+ dev->nErasedBlocks, dev->param.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->param.nChunksPerBlock;
+ int realignedChunk = chunk - dev->chunkOffset;
+
+ dev->param.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)
{
- int i;
-
+
+
+ dev->checkpointOpenForWrite = forWriting;
+
/* Got the functions we need? */
- if (!dev->writeChunkWithTagsToNAND ||
- !dev->readChunkWithTagsFromNAND ||
- !dev->eraseBlockInNAND)
+ if (!dev->param.writeChunkWithTagsToNAND ||
+ !dev->param.readChunkWithTagsFromNAND ||
+ !dev->param.eraseBlockInNAND ||
+ !dev->param.markNANDBlockBad)
return 0;
-
- /* Got a valid checkpoint data region? */
- if(!yaffs_CheckpointSpaceOk(dev))
+
+ if (forWriting && !yaffs_CheckpointSpaceOk(dev))
return 0;
-
- if(!dev->checkpointBuffer)
- dev->checkpointBuffer = YMALLOC(dev->nBytesPerChunk);
- if(!dev->checkpointBuffer)
+
+ if (!dev->checkpointBuffer)
+ dev->checkpointBuffer = YMALLOC_DMA(dev->param.totalBytesPerChunk);
+ if (!dev->checkpointBuffer)
return 0;
-
- dev->checkpointPage = dev->checkpointStartBlock * dev->nChunksPerBlock;
-
- dev->checkpointOpenForWrite = forWriting;
-
+
+
+ dev->checkpointPageSequence = 0;
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){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt data"TENDSTR)));
- for( i = dev->checkpointStartBlock; i <= dev->checkpointEndBlock; i++)
- dev->eraseBlockInNAND(dev,i);
-
+ if (forWriting) {
+ memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
dev->checkpointByteOffset = 0;
-
- memset(dev->checkpointBuffer,0,dev->nBytesPerChunk);
-
+ 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->blocksInCheckpoint = 0;
+ dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
+ dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
+ if(!dev->checkpointBlockList)
+ return 0;
+
+ for (i = 0; i < dev->checkpointMaxBlocks; i++)
+ dev->checkpointBlockList[i] = -1;
}
-
+
return 1;
}
-static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
+int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
{
+ __u32 compositeSum;
+ compositeSum = (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
+ *sum = compositeSum;
+ return 1;
+}
- int blockNo;
- int goodBlockFound;
- yaffs_BlockState state;
- __u32 seqenceNumber;
+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 = YAFFS_OBJECTID_CHECKPOINT_DATA;
- tags.chunkId = dev->checkpointPage + 1;
- tags.sequenceNumber = 1;
- tags.byteCount = dev->nBytesPerChunk;
-
- /* printf("write checkpoint page %d\n",dev->checkpointPage); */
-
- if(dev->checkpointPage%dev->nChunksPerBlock == 0){
- /* Start of a new block, do a block validity check */
- blockNo = dev->checkpointPage/dev->nChunksPerBlock;
- goodBlockFound = 0;
- while(blockNo <= dev->checkpointEndBlock && !goodBlockFound){
- dev->queryNANDBlock(dev,blockNo,&state,&tags);
- if(state != YAFFS_BLOCK_STATE_DEAD)
- goodBlockFound = 1;
- else {
- blockNo++;
- dev->checkpointPage += dev->nChunksPerBlock;
- }
- }
-
- if(!goodBlockFound)
- return 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++;
}
-
- dev->writeChunkWithTagsToNAND(dev, dev->checkpointPage,
- dev->checkpointBuffer,&tags);
+
+ chunk = dev->checkpointCurrentBlock * dev->param.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->nPageWrites++;
+
+ dev->param.writeChunkWithTagsToNAND(dev, realignedChunk,
+ dev->checkpointBuffer, &tags);
dev->checkpointByteOffset = 0;
- dev->checkpointPage++;
- memset(dev->checkpointBuffer,0,dev->nBytesPerChunk);
-
+ dev->checkpointPageSequence++;
+ dev->checkpointCurrentChunk++;
+ if (dev->checkpointCurrentChunk >= dev->param.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 yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
{
- int i=0;
+ int i = 0;
int ok = 1;
-
+
__u8 * dataBytes = (__u8 *)data;
-
-
- if(!dev->checkpointBuffer)
+
+
+ if (!dev->checkpointBuffer)
return 0;
- while(i < nBytes && ok) {
-
+ if (!dev->checkpointOpenForWrite)
+ return -1;
+
+ while (i < nBytes && ok) {
+ dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes;
+ dev->checkpointSum += *dataBytes;
+ dev->checkpointXor ^= *dataBytes;
-
- dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
dev->checkpointByteOffset++;
i++;
dataBytes++;
dev->checkpointByteCount++;
-
-
- if(dev->checkpointByteOffset < 0 ||
- dev->checkpointByteOffset >= dev->nBytesPerChunk)
- ok = yaffs_CheckpointFlushBuffer(dev);
+
+ if (dev->checkpointByteOffset < 0 ||
+ dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
+ ok = yaffs_CheckpointFlushBuffer(dev);
}
-
- return i;
+
+ return i;
}
int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
{
- int i=0;
+ int i = 0;
int ok = 1;
yaffs_ExtendedTags tags;
- yaffs_BlockState state;
- int blockNo;
- int goodBlockFound;
+
+
+ int chunk;
+ int realignedChunk;
__u8 *dataBytes = (__u8 *)data;
-
- if(!dev->checkpointBuffer)
+
+ if (!dev->checkpointBuffer)
return 0;
- while(i < nBytes && ok) {
- if(dev->checkpointByteOffset < 0 ||
- dev->checkpointByteOffset >= dev->nBytesPerChunk) {
- if(dev->checkpointPage%dev->nChunksPerBlock == 0){
- /* Start of a new block, do a block validity check */
- blockNo = dev->checkpointPage/dev->nChunksPerBlock;
- goodBlockFound = 0;
- while(blockNo <= dev->checkpointEndBlock && !goodBlockFound){
- dev->queryNANDBlock(dev,blockNo,&state,&tags);
- if(state != YAFFS_BLOCK_STATE_DEAD)
- goodBlockFound = 1;
- else {
- blockNo++;
- dev->checkpointPage += dev->nChunksPerBlock;
- }
- }
-
- if(!goodBlockFound)
- return 0;
- }
+ if (dev->checkpointOpenForWrite)
+ return -1;
+
+ while (i < nBytes && ok) {
- /* read in the next chunk */
- /* printf("read checkpoint page %d\n",dev->checkpointPage); */
- dev->readChunkWithTagsFromNAND(dev, dev->checkpointPage,
- dev->checkpointBuffer,
- &tags);
-
- if(tags.objectId != YAFFS_OBJECTID_CHECKPOINT_DATA ||
- tags.chunkId != (dev->checkpointPage + 1))
- ok = 0;
+ if (dev->checkpointByteOffset < 0 ||
+ dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
- dev->checkpointByteOffset = 0;
- dev->checkpointPage++;
+ if (dev->checkpointCurrentBlock < 0) {
+ yaffs_CheckpointFindNextCheckpointBlock(dev);
+ dev->checkpointCurrentChunk = 0;
+ }
+
+ if (dev->checkpointCurrentBlock < 0)
+ ok = 0;
+ else {
+ chunk = dev->checkpointCurrentBlock *
+ dev->param.nChunksPerBlock +
+ dev->checkpointCurrentChunk;
+
+ realignedChunk = chunk - dev->chunkOffset;
+
+ dev->nPageReads++;
+
+ /* read in the next chunk */
+ /* printf("read checkpoint page %d\n",dev->checkpointPage); */
+ dev->param.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->param.nChunksPerBlock)
+ dev->checkpointCurrentBlock = -1;
+ }
}
-
- if(ok){
+
+ 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)
+ if (dev->checkpointOpenForWrite) {
+ if (dev->checkpointByteOffset != 0)
yaffs_CheckpointFlushBuffer(dev);
+ } else if(dev->checkpointBlockList){
+ int i;
+ for (i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++) {
+ int blk = dev->checkpointBlockList[i];
+ yaffs_BlockInfo *bi = NULL;
+ if( dev->internalStartBlock <= blk && blk <= dev->internalEndBlock)
+ bi = yaffs_GetBlockInfo(dev, blk);
+ if (bi && bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
+ bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
+ else {
+ /* Todo this looks odd... */
+ }
+ }
+ YFREE(dev->checkpointBlockList);
+ dev->checkpointBlockList = NULL;
}
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
+ dev->nFreeChunks -= dev->blocksInCheckpoint * dev->param.nChunksPerBlock;
+ dev->nErasedBlocks -= dev->blocksInCheckpoint;
+
+
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint byte count %d" TENDSTR),
dev->checkpointByteCount));
-
- if(dev->checkpointBuffer){
- /* flush the buffer */
+
+ if (dev->checkpointBuffer) {
+ /* free the buffer */
YFREE(dev->checkpointBuffer);
dev->checkpointBuffer = NULL;
return 1;
- }
- else
+ } 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;
+ /* Erase the checkpoint data */
- if(dev->eraseBlockInNAND){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt data"TENDSTR)));
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
+ dev->blocksInCheckpoint));
- return dev->eraseBlockInNAND(dev, dev->checkpointStartBlock);
- }
- else
- return 0;
+ return yaffs_CheckpointErase(dev);
}
projects / yaffs2.git / blobdiff