From: Charles Manning <cdhmanning@gmail.com>
Date: Thu, 29 Oct 2009 23:08:15 +0000 (+1300)
Subject: Fix yaffs checkpoint out of space crash
X-Git-Tag: firefly_0821_release~11691
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8ff4860c2778c0be92a63808036de337d13fa864;p=firefly-linux-kernel-4.4.55.git

Fix yaffs checkpoint out of space crash
An ealy return from checkpoint opening caused the writing flag
to be set incorrectly which caused the wrong execution path during
the close.

Also clean up space left behind by aborted checkpoints.

Also jsut neaten up NULL handling.

Signed-off-by: Charles Manning <cdhmanning@gmail.com>
---

diff --git a/fs/yaffs2/yaffs_checkptrw.c b/fs/yaffs2/yaffs_checkptrw.c
index 66a4e7d9f0f9..7b69a640f4b0 100644
--- a/fs/yaffs2/yaffs_checkptrw.c
+++ b/fs/yaffs2/yaffs_checkptrw.c
@@ -130,6 +130,9 @@ static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
 int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
 {
 
+
+	dev->checkpointOpenForWrite = forWriting;
+
 	/* Got the functions we need? */
 	if (!dev->writeChunkWithTagsToNAND ||
 			!dev->readChunkWithTagsFromNAND ||
@@ -147,9 +150,6 @@ int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
 
 
 	dev->checkpointPageSequence = 0;
-
-	dev->checkpointOpenForWrite = forWriting;
-
 	dev->checkpointByteCount = 0;
 	dev->checkpointSum = 0;
 	dev->checkpointXor = 0;
@@ -358,11 +358,14 @@ int yaffs_CheckpointClose(yaffs_Device *dev)
 	if (dev->checkpointOpenForWrite) {
 		if (dev->checkpointByteOffset != 0)
 			yaffs_CheckpointFlushBuffer(dev);
-	} else {
+	} else if(dev->checkpointBlockList){
 		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)
+			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... */
@@ -390,15 +393,10 @@ int yaffs_CheckpointClose(yaffs_Device *dev)
 
 int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
 {
-	/* Erase the first checksum block */
-
-	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate"TENDSTR)));
+	/* Erase the checkpoint data */
 
-	if (!yaffs_CheckpointSpaceOk(dev))
-		return 0;
+	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
+		dev->blocksInCheckpoint));
 
 	return yaffs_CheckpointErase(dev);
 }
-
-
-
diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c
index 155b74643eb8..05ff48d1bc46 100644
--- a/fs/yaffs2/yaffs_guts.c
+++ b/fs/yaffs2/yaffs_guts.c
@@ -7436,6 +7436,9 @@ int yaffs_GutsInitialise(yaffs_Device *dev)
 	yaffs_VerifyFreeChunks(dev);
 	yaffs_VerifyBlocks(dev);
 
+	/* Clean up any aborted checkpoint data */
+	if (!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
+		yaffs_InvalidateCheckpoint(dev);
 
 	T(YAFFS_TRACE_TRACING,
 	  (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));