yaffs: Import yaffs from Wed Sep 9 03:03:01 2009 +0000

Author: charles <charles>
Date:   Wed Sep 9 03:03:01 2009 +0000

    Rationalise stats gathering for nand access. Does not instrument mounting.

Signed-off-by: Arve Hjønnevåg <arve@android.com>

6 files changed, 97 insertions, 34 deletions

diff --git a/fs/yaffs2/yaffs_checkptrw.c b/fs/yaffs2/yaffs_checkptrw.c
index 288b550ae4df..66a4e7d9f0f9 100644
--- a/fs/yaffs2/yaffs_checkptrw.c
+++ b/fs/yaffs2/yaffs_checkptrw.c
@@ -43,6 +43,9 @@ static int yaffs_CheckpointErase(yaffs_Device *dev)
 		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->eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
 				bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
 				dev->nErasedBlocks++;
@@ -168,6 +171,9 @@ int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
 		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;
 	}
@@ -219,6 +225,8 @@ static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
 
 	realignedChunk = chunk - dev->chunkOffset;
 
+	dev->nPageWrites++;
+
 	dev->writeChunkWithTagsToNAND(dev, realignedChunk,
 			dev->checkpointBuffer, &tags);
 	dev->checkpointByteOffset = 0;
@@ -306,6 +314,8 @@ int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
 					dev->checkpointCurrentChunk;
 
 				realignedChunk = chunk - dev->chunkOffset;
+				
+				dev->nPageReads++;
 
 				/* read in the next chunk */
 				/* printf("read checkpoint page %d\n",dev->checkpointPage); */
diff --git a/fs/yaffs2/yaffs_fs.c b/fs/yaffs2/yaffs_fs.c
index 30ae7c7e259a..47cae6f4f92c 100644
--- a/fs/yaffs2/yaffs_fs.c
+++ b/fs/yaffs2/yaffs_fs.c
@@ -163,6 +163,11 @@ static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
 #define yaffs_SuperToDevice(sb)	((yaffs_Device *)sb->u.generic_sbp)
 #endif
 
+
+#define update_dir_time(dir) do {\
+			(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
+		} while(0)
+		
 static void yaffs_put_super(struct super_block *sb);
 
 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
@@ -1075,7 +1080,7 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 
 	}
 	yaffs_GrossUnlock(dev);
-	return nWritten == 0 ? -ENOSPC : nWritten;
+	return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
 }
 
 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
@@ -1286,6 +1291,7 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 	if (obj) {
 		inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 		d_instantiate(dentry, inode);
+		update_dir_time(dir);
 		T(YAFFS_TRACE_OS,
 			("yaffs_mknod created object %d count = %d\n",
 			obj->objectId, atomic_read(&inode->i_count)));
@@ -1339,6 +1345,7 @@ static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
 		dir->i_version++;
 		yaffs_GrossUnlock(dev);
 		mark_inode_dirty(dentry->d_inode);
+		update_dir_time(dir);
 		return 0;
 	}
 	yaffs_GrossUnlock(dev);
@@ -1379,8 +1386,10 @@ static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 
 	yaffs_GrossUnlock(dev);
 
-	if (link)
+	if (link){
+		update_dir_time(dir);
 		return 0;
+	}
 
 	return -EPERM;
 }
@@ -1406,6 +1415,7 @@ static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 
 		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 		d_instantiate(dentry, inode);
+		update_dir_time(dir);
 		T(YAFFS_TRACE_OS, ("symlink created OK\n"));
 		return 0;
 	} else {
@@ -1478,7 +1488,10 @@ static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			new_dentry->d_inode->i_nlink--;
 			mark_inode_dirty(new_dentry->d_inode);
 		}
-
+		
+		update_dir_time(old_dir);
+		if(old_dir != new_dir)
+			update_dir_time(new_dir);
 		return 0;
 	} else {
 		return -ENOTEMPTY;
diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c
index 0de2ad329f92..155b74643eb8 100644
--- a/fs/yaffs2/yaffs_guts.c
+++ b/fs/yaffs2/yaffs_guts.c
@@ -49,6 +49,7 @@ static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
 				const yaffs_ExtendedTags *tags);
 
 /* Other local prototypes */
+static void yaffs_UpdateParent(yaffs_Object *obj);
 static int yaffs_UnlinkObject(yaffs_Object *obj);
 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
 
@@ -759,7 +760,7 @@ static void yaffs_VerifyObject(yaffs_Object *obj)
 	chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
 
 	chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
-	chunkIdOk = chunkInRange || obj->hdrChunk == 0;
+	chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
 	chunkValid = chunkInRange &&
 			yaffs_CheckChunkBit(dev,
 					obj->hdrChunk / dev->nChunksPerBlock,
@@ -1544,11 +1545,16 @@ static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
 	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
 		if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
 				theChunk % dev->nChunksPerBlock)) {
-			yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
-							tags);
-			if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
-				/* found it; */
+			
+			if(dev->chunkGroupSize == 1)
 				return theChunk;
+			else {
+				yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
+								tags);
+				if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
+					/* found it; */
+					return theChunk;
+				}
 			}
 		}
 		theChunk++;
@@ -2345,6 +2351,7 @@ static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
 			in = NULL;
 		}
 
+		yaffs_UpdateParent(parent);
 	}
 
 	return in;
@@ -2499,6 +2506,9 @@ int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
 						existingTarget->objectId);
 			yaffs_UnlinkObject(existingTarget);
 		}
+		yaffs_UpdateParent(oldDir);
+		if(newDir != oldDir)
+			yaffs_UpdateParent(newDir);
 
 		return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
 	}
@@ -2964,7 +2974,6 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 
 	isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
 
-	bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
 
 	T(YAFFS_TRACE_TRACING,
 			(TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
@@ -2975,12 +2984,16 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 
 	/*yaffs_VerifyFreeChunks(dev); */
 
+	if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
+		bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
+	
 	bi->hasShrinkHeader = 0;	/* clear the flag so that the block can erase */
 
 	/* Take off the number of soft deleted entries because
 	 * they're going to get really deleted during GC.
 	 */
-	dev->nFreeChunks -= bi->softDeletions;
+	if(dev->gcChunk == 0) /* first time through for this block */
+		dev->nFreeChunks -= bi->softDeletions;
 
 	dev->isDoingGC = 1;
 
@@ -3624,7 +3637,7 @@ static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
 	newTags.chunkId = chunkInInode;
 	newTags.objectId = in->objectId;
 	newTags.serialNumber =
-	    (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
+	    (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
 	newTags.byteCount = nBytes;
 
 	if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
@@ -3640,7 +3653,7 @@ static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
 	if (newChunkId >= 0) {
 		yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
 
-		if (prevChunkId >= 0)
+		if (prevChunkId > 0)
 			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
 
 		yaffs_CheckFileSanity(in);
@@ -3726,7 +3739,7 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 		if (name && *name) {
 			memset(oh->name, 0, sizeof(oh->name));
 			yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
-		} else if (prevChunkId >= 0)
+		} else if (prevChunkId > 0)
 			memcpy(oh->name, oldName, sizeof(oh->name));
 		else
 			memset(oh->name, 0, sizeof(oh->name));
@@ -3784,13 +3797,13 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 		/* Create new chunk in NAND */
 		newChunkId =
 		    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-						      (prevChunkId >= 0) ? 1 : 0);
+						      (prevChunkId > 0) ? 1 : 0);
 
 		if (newChunkId >= 0) {
 
 			in->hdrChunk = newChunkId;
 
-			if (prevChunkId >= 0) {
+			if (prevChunkId > 0) {
 				yaffs_DeleteChunk(dev, prevChunkId, 1,
 						  __LINE__);
 			}
@@ -5164,14 +5177,19 @@ int yaffs_DeleteFile(yaffs_Object *in)
 	}
 }
 
-static int yaffs_DeleteDirectory(yaffs_Object *in)
+static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
 {
-	/* First check that the directory is empty. */
-	if (ylist_empty(&in->variant.directoryVariant.children))
-		return yaffs_DoGenericObjectDeletion(in);
+	return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+		!(ylist_empty(&obj->variant.directoryVariant.children));
+}
 
-	return YAFFS_FAIL;
+static int yaffs_DeleteDirectory(yaffs_Object *obj)
+{
+	/* First check that the directory is empty. */
+	if (yaffs_IsNonEmptyDirectory(obj))
+		return YAFFS_FAIL;
 
+	return yaffs_DoGenericObjectDeletion(obj);
 }
 
 static int yaffs_DeleteSymLink(yaffs_Object *in)
@@ -5230,6 +5248,9 @@ static int yaffs_UnlinkWorker(yaffs_Object *obj)
 		immediateDeletion = 1;
 #endif
 
+	if(obj)
+		yaffs_UpdateParent(obj->parent);
+
 	if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
 		return yaffs_DeleteHardLink(obj);
 	} else if (!ylist_empty(&obj->hardLinks)) {
@@ -5284,7 +5305,9 @@ static int yaffs_UnlinkWorker(yaffs_Object *obj)
 		default:
 			return YAFFS_FAIL;
 		}
-	} else
+	} else if(yaffs_IsNonEmptyDirectory(obj))
+		return YAFFS_FAIL;
+	else
 		return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
 					   _Y("unlinked"), 0, 0);
 }
@@ -6666,6 +6689,26 @@ static void yaffs_VerifyDirectory(yaffs_Object *directory)
 	}
 }
 
+/*
+ *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ */
+ 
+static void yaffs_UpdateParent(yaffs_Object *obj)
+{
+	if(!obj)
+		return;
+
+	obj->dirty = 1;
+	obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
+
+	yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
+}
 
 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
 {
@@ -6683,11 +6726,10 @@ static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
 
 	ylist_del_init(&obj->siblings);
 	obj->parent = NULL;
-
+	
 	yaffs_VerifyDirectory(parent);
 }
 
-
 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
 					yaffs_Object *obj)
 {
@@ -6781,7 +6823,7 @@ yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
 				 * Do a real check
 				 */
 				yaffs_GetObjectName(l, buffer,
-						    YAFFS_MAX_NAME_LENGTH);
+						    YAFFS_MAX_NAME_LENGTH + 1);
 				if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
 					return l;
 			}
@@ -7030,7 +7072,7 @@ int yaffs_DumpObject(yaffs_Object *obj)
 {
 	YCHAR name[257];
 
-	yaffs_GetObjectName(obj, name, 256);
+	yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
 
 	T(YAFFS_TRACE_ALWAYS,
 	  (TSTR
diff --git a/fs/yaffs2/yaffs_mtdif1.c b/fs/yaffs2/yaffs_mtdif1.c
index 1d9311ae011e..bcac47025ece 100644
--- a/fs/yaffs2/yaffs_mtdif1.c
+++ b/fs/yaffs2/yaffs_mtdif1.c
@@ -102,8 +102,6 @@ int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
 	compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
 	compile_time_assertion(sizeof(yaffs_Tags) == 8);
 
-	dev->nPageWrites++;
-
 	yaffs_PackTags1(&pt1, etags);
 	yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
 
@@ -180,8 +178,6 @@ int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
 	int retval;
 	int deleted;
 
-	dev->nPageReads++;
-
 	memset(&ops, 0, sizeof(ops));
 	ops.mode = MTD_OOB_AUTO;
 	ops.len = (data) ? chunkBytes : 0;
diff --git a/fs/yaffs2/yaffs_nand.c b/fs/yaffs2/yaffs_nand.c
index ec3276107249..f6ba4c794ac4 100644
--- a/fs/yaffs2/yaffs_nand.c
+++ b/fs/yaffs2/yaffs_nand.c
@@ -29,6 +29,8 @@ int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
 
 	int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
 
+	dev->nPageReads++;
+
 	/* If there are no tags provided, use local tags to get prioritised gc working */
 	if (!tags)
 		tags = &localTags;
@@ -56,6 +58,9 @@ int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,
 						   const __u8 *buffer,
 						   yaffs_ExtendedTags *tags)
 {
+
+	dev->nPageWrites++;
+
 	chunkInNAND -= dev->chunkOffset;
 
 
@@ -89,7 +94,7 @@ int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
 {
 	blockNo -= dev->blockOffset;
 
-;
+
 	if (dev->markNANDBlockBad)
 		return dev->markNANDBlockBad(dev, blockNo);
 	else
@@ -119,8 +124,8 @@ int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 
 	blockInNAND -= dev->blockOffset;
 
-
 	dev->nBlockErasures++;
+
 	result = dev->eraseBlockInNAND(dev, blockInNAND);
 
 	return result;
diff --git a/fs/yaffs2/yaffs_tagscompat.c b/fs/yaffs2/yaffs_tagscompat.c
index 402537fb4ee1..e3173cc2e23b 100644
--- a/fs/yaffs2/yaffs_tagscompat.c
+++ b/fs/yaffs2/yaffs_tagscompat.c
@@ -170,7 +170,6 @@ static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,
 		return YAFFS_FAIL;
 	}
 
-	dev->nPageWrites++;
 	return dev->writeChunkToNAND(dev, chunkInNAND, data, spare);
 }
 
@@ -184,8 +183,6 @@ static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
 	int retVal;
 	yaffs_Spare localSpare;
 
-	dev->nPageReads++;
-
 	if (!spare && data) {
 		/* If we don't have a real spare, then we use a local one. */
 		/* Need this for the calculation of the ecc */