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_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;
}
