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);
}
int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
{
dev->checkpointOpenForWrite = 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->totalBytesPerChunk);
if (!dev->checkpointBuffer)
return 0;
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) {
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);
if(!dev->checkpointBlockList)
return 0;
for (i = 0; i < dev->checkpointMaxBlocks; i++)
dev->checkpointBlockList[i] = -1;
}
return 1;
}
