Merge branch 'for-2.6.25' of master.kernel.org:/pub/scm/linux/kernel/git/arnd/cell-2.6 into merge

17 files changed, 319 insertions, 124 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 33888bb58144..2c23bade9aa6 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -46,7 +46,7 @@ const struct file_operations ext4_dir_operations = {
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= ext4_compat_ioctl,
 #endif
-	.fsync		= ext4_sync_file,	/* BKL held */
+	.fsync		= ext4_sync_file,
 	.release	= ext4_release_dir,
 };
 
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index bc7081f1fbe8..9ae6e67090cd 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -148,6 +148,7 @@ static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
 {
 	struct ext4_inode_info *ei = EXT4_I(inode);
 	ext4_fsblk_t bg_start;
+	ext4_fsblk_t last_block;
 	ext4_grpblk_t colour;
 	int depth;
 
@@ -169,8 +170,13 @@ static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
 	/* OK. use inode's group */
 	bg_start = (ei->i_block_group * EXT4_BLOCKS_PER_GROUP(inode->i_sb)) +
 		le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_first_data_block);
-	colour = (current->pid % 16) *
+	last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1;
+
+	if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
+		colour = (current->pid % 16) *
 			(EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
+	else
+		colour = (current->pid % 16) * ((last_block - bg_start) / 16);
 	return bg_start + colour + block;
 }
 
@@ -349,7 +355,7 @@ static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
 #define ext4_ext_show_leaf(inode,path)
 #endif
 
-static void ext4_ext_drop_refs(struct ext4_ext_path *path)
+void ext4_ext_drop_refs(struct ext4_ext_path *path)
 {
 	int depth = path->p_depth;
 	int i;
@@ -2168,6 +2174,10 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
 	newblock = iblock - ee_block + ext_pblock(ex);
 	ex2 = ex;
 
+	err = ext4_ext_get_access(handle, inode, path + depth);
+	if (err)
+		goto out;
+
 	/* ex1: ee_block to iblock - 1 : uninitialized */
 	if (iblock > ee_block) {
 		ex1 = ex;
@@ -2200,16 +2210,20 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
 		newdepth = ext_depth(inode);
 		if (newdepth != depth) {
 			depth = newdepth;
-			path = ext4_ext_find_extent(inode, iblock, NULL);
+			ext4_ext_drop_refs(path);
+			path = ext4_ext_find_extent(inode, iblock, path);
 			if (IS_ERR(path)) {
 				err = PTR_ERR(path);
-				path = NULL;
 				goto out;
 			}
 			eh = path[depth].p_hdr;
 			ex = path[depth].p_ext;
 			if (ex2 != &newex)
 				ex2 = ex;
+
+			err = ext4_ext_get_access(handle, inode, path + depth);
+			if (err)
+				goto out;
 		}
 		allocated = max_blocks;
 	}
@@ -2230,9 +2244,6 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
 	ex2->ee_len = cpu_to_le16(allocated);
 	if (ex2 != ex)
 		goto insert;
-	err = ext4_ext_get_access(handle, inode, path + depth);
-	if (err)
-		goto out;
 	/*
 	 * New (initialized) extent starts from the first block
 	 * in the current extent. i.e., ex2 == ex
@@ -2276,9 +2287,22 @@ out:
 }
 
 /*
+ * Block allocation/map/preallocation routine for extents based files
+ *
+ *
  * Need to be called with
  * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
  * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
+ *
+ * return > 0, number of of blocks already mapped/allocated
+ *          if create == 0 and these are pre-allocated blocks
+ *          	buffer head is unmapped
+ *          otherwise blocks are mapped
+ *
+ * return = 0, if plain look up failed (blocks have not been allocated)
+ *          buffer head is unmapped
+ *
+ * return < 0, error case.
  */
 int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
 			ext4_lblk_t iblock,
@@ -2623,7 +2647,7 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
 	 * modify 1 super block, 1 block bitmap and 1 group descriptor.
 	 */
 	credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + 3;
-	down_write((&EXT4_I(inode)->i_data_sem));
+	mutex_lock(&inode->i_mutex);
 retry:
 	while (ret >= 0 && ret < max_blocks) {
 		block = block + ret;
@@ -2634,16 +2658,17 @@ retry:
 			break;
 		}
 
-		ret = ext4_ext_get_blocks(handle, inode, block,
+		ret = ext4_get_blocks_wrap(handle, inode, block,
 					  max_blocks, &map_bh,
 					  EXT4_CREATE_UNINITIALIZED_EXT, 0);
-		WARN_ON(ret <= 0);
 		if (ret <= 0) {
-			ext4_error(inode->i_sb, "ext4_fallocate",
-				    "ext4_ext_get_blocks returned error: "
-				    "inode#%lu, block=%u, max_blocks=%lu",
+#ifdef EXT4FS_DEBUG
+			WARN_ON(ret <= 0);
+			printk(KERN_ERR "%s: ext4_ext_get_blocks "
+				    "returned error inode#%lu, block=%u, "
+				    "max_blocks=%lu", __func__,
 				    inode->i_ino, block, max_blocks);
-			ret = -EIO;
+#endif
 			ext4_mark_inode_dirty(handle, inode);
 			ret2 = ext4_journal_stop(handle);
 			break;
@@ -2680,7 +2705,6 @@ retry:
 	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 		goto retry;
 
-	up_write((&EXT4_I(inode)->i_data_sem));
 	/*
 	 * Time to update the file size.
 	 * Update only when preallocation was requested beyond the file size.
@@ -2692,21 +2716,18 @@ retry:
 			 * if no error, we assume preallocation succeeded
 			 * completely
 			 */
-			mutex_lock(&inode->i_mutex);
 			i_size_write(inode, offset + len);
 			EXT4_I(inode)->i_disksize = i_size_read(inode);
-			mutex_unlock(&inode->i_mutex);
 		} else if (ret < 0 && nblocks) {
 			/* Handle partial allocation scenario */
 			loff_t newsize;
 
-			mutex_lock(&inode->i_mutex);
 			newsize  = (nblocks << blkbits) + i_size_read(inode);
 			i_size_write(inode, EXT4_BLOCK_ALIGN(newsize, blkbits));
 			EXT4_I(inode)->i_disksize = i_size_read(inode);
-			mutex_unlock(&inode->i_mutex);
 		}
 	}
 
+	mutex_unlock(&inode->i_mutex);
 	return ret > 0 ? ret2 : ret;
 }
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index da18a74b966a..8036b9b5376b 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -702,7 +702,12 @@ got:
 	ei->i_dir_start_lookup = 0;
 	ei->i_disksize = 0;
 
-	ei->i_flags = EXT4_I(dir)->i_flags & ~EXT4_INDEX_FL;
+	/*
+	 * Don't inherit extent flag from directory. We set extent flag on
+	 * newly created directory and file only if -o extent mount option is
+	 * specified
+	 */
+	ei->i_flags = EXT4_I(dir)->i_flags & ~(EXT4_INDEX_FL|EXT4_EXTENTS_FL);
 	if (S_ISLNK(mode))
 		ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL);
 	/* dirsync only applies to directories */
@@ -745,12 +750,15 @@ got:
 		goto fail_free_drop;
 	}
 	if (test_opt(sb, EXTENTS)) {
-		EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
-		ext4_ext_tree_init(handle, inode);
-		err = ext4_update_incompat_feature(handle, sb,
-						EXT4_FEATURE_INCOMPAT_EXTENTS);
-		if (err)
-			goto fail;
+		/* set extent flag only for directory and file */
+		if (S_ISDIR(mode) || S_ISREG(mode)) {
+			EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
+			ext4_ext_tree_init(handle, inode);
+			err = ext4_update_incompat_feature(handle, sb,
+					EXT4_FEATURE_INCOMPAT_EXTENTS);
+			if (err)
+				goto fail;
+		}
 	}
 
 	ext4_debug("allocating inode %lu\n", inode->i_ino);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7dd9b50d5ebc..945cbf6cb1fc 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -403,6 +403,7 @@ static ext4_fsblk_t ext4_find_near(struct inode *inode, Indirect *ind)
 	__le32 *start = ind->bh ? (__le32*) ind->bh->b_data : ei->i_data;
 	__le32 *p;
 	ext4_fsblk_t bg_start;
+	ext4_fsblk_t last_block;
 	ext4_grpblk_t colour;
 
 	/* Try to find previous block */
@@ -420,8 +421,13 @@ static ext4_fsblk_t ext4_find_near(struct inode *inode, Indirect *ind)
 	 * into the same cylinder group then.
 	 */
 	bg_start = ext4_group_first_block_no(inode->i_sb, ei->i_block_group);
-	colour = (current->pid % 16) *
+	last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1;
+
+	if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
+		colour = (current->pid % 16) *
 			(EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
+	else
+		colour = (current->pid % 16) * ((last_block - bg_start) / 16);
 	return bg_start + colour;
 }
 
@@ -768,7 +774,6 @@ err_out:
  *
  * `handle' can be NULL if create == 0.
  *
- * The BKL may not be held on entry here.  Be sure to take it early.
  * return > 0, # of blocks mapped or allocated.
  * return = 0, if plain lookup failed.
  * return < 0, error case.
@@ -903,11 +908,38 @@ out:
  */
 #define DIO_CREDITS 25
 
+
+/*
+ *
+ *
+ * ext4_ext4 get_block() wrapper function
+ * It will do a look up first, and returns if the blocks already mapped.
+ * Otherwise it takes the write lock of the i_data_sem and allocate blocks
+ * and store the allocated blocks in the result buffer head and mark it
+ * mapped.
+ *
+ * If file type is extents based, it will call ext4_ext_get_blocks(),
+ * Otherwise, call with ext4_get_blocks_handle() to handle indirect mapping
+ * based files
+ *
+ * On success, it returns the number of blocks being mapped or allocate.
+ * if create==0 and the blocks are pre-allocated and uninitialized block,
+ * the result buffer head is unmapped. If the create ==1, it will make sure
+ * the buffer head is mapped.
+ *
+ * It returns 0 if plain look up failed (blocks have not been allocated), in
+ * that casem, buffer head is unmapped
+ *
+ * It returns the error in case of allocation failure.
+ */
 int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
 			unsigned long max_blocks, struct buffer_head *bh,
 			int create, int extend_disksize)
 {
 	int retval;
+
+	clear_buffer_mapped(bh);
+
 	/*
 	 * Try to see if we can get  the block without requesting
 	 * for new file system block.
@@ -921,12 +953,26 @@ int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
 				inode, block, max_blocks, bh, 0, 0);
 	}
 	up_read((&EXT4_I(inode)->i_data_sem));
-	if (!create || (retval > 0))
+
+	/* If it is only a block(s) look up */
+	if (!create)
+		return retval;
+
+	/*
+	 * Returns if the blocks have already allocated
+	 *
+	 * Note that if blocks have been preallocated
+	 * ext4_ext_get_block() returns th create = 0
+	 * with buffer head unmapped.
+	 */
+	if (retval > 0 && buffer_mapped(bh))
 		return retval;
 
 	/*
-	 * We need to allocate new blocks which will result
-	 * in i_data update
+	 * New blocks allocate and/or writing to uninitialized extent
+	 * will possibly result in updating i_data, so we take
+	 * the write lock of i_data_sem, and call get_blocks()
+	 * with create == 1 flag.
 	 */
 	down_write((&EXT4_I(inode)->i_data_sem));
 	/*
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index dd0fcfcb35ce..ef97f19c2f9d 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -627,21 +627,19 @@ static ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
 	return block;
 }
 
+static inline void *mb_correct_addr_and_bit(int *bit, void *addr)
+{
 #if BITS_PER_LONG == 64
-#define mb_correct_addr_and_bit(bit, addr)		\
-{							\
-	bit += ((unsigned long) addr & 7UL) << 3;	\
-	addr = (void *) ((unsigned long) addr & ~7UL);	\
-}
+	*bit += ((unsigned long) addr & 7UL) << 3;
+	addr = (void *) ((unsigned long) addr & ~7UL);
 #elif BITS_PER_LONG == 32
-#define mb_correct_addr_and_bit(bit, addr)		\
-{							\
-	bit += ((unsigned long) addr & 3UL) << 3;	\
-	addr = (void *) ((unsigned long) addr & ~3UL);	\
-}
+	*bit += ((unsigned long) addr & 3UL) << 3;
+	addr = (void *) ((unsigned long) addr & ~3UL);
 #else
 #error "how many bits you are?!"
 #endif
+	return addr;
+}
 
 static inline int mb_test_bit(int bit, void *addr)
 {
@@ -649,34 +647,54 @@ static inline int mb_test_bit(int bit, void *addr)
 	 * ext4_test_bit on architecture like powerpc
 	 * needs unsigned long aligned address
 	 */
-	mb_correct_addr_and_bit(bit, addr);
+	addr = mb_correct_addr_and_bit(&bit, addr);
 	return ext4_test_bit(bit, addr);
 }
 
 static inline void mb_set_bit(int bit, void *addr)
 {
-	mb_correct_addr_and_bit(bit, addr);
+	addr = mb_correct_addr_and_bit(&bit, addr);
 	ext4_set_bit(bit, addr);
 }
 
 static inline void mb_set_bit_atomic(spinlock_t *lock, int bit, void *addr)
 {
-	mb_correct_addr_and_bit(bit, addr);
+	addr = mb_correct_addr_and_bit(&bit, addr);
 	ext4_set_bit_atomic(lock, bit, addr);
 }
 
 static inline void mb_clear_bit(int bit, void *addr)
 {
-	mb_correct_addr_and_bit(bit, addr);
+	addr = mb_correct_addr_and_bit(&bit, addr);
 	ext4_clear_bit(bit, addr);
 }
 
 static inline void mb_clear_bit_atomic(spinlock_t *lock, int bit, void *addr)
 {
-	mb_correct_addr_and_bit(bit, addr);
+	addr = mb_correct_addr_and_bit(&bit, addr);
 	ext4_clear_bit_atomic(lock, bit, addr);
 }
 
+static inline int mb_find_next_zero_bit(void *addr, int max, int start)
+{
+	int fix = 0;
+	addr = mb_correct_addr_and_bit(&fix, addr);
+	max += fix;
+	start += fix;
+
+	return ext4_find_next_zero_bit(addr, max, start) - fix;
+}
+
+static inline int mb_find_next_bit(void *addr, int max, int start)
+{
+	int fix = 0;
+	addr = mb_correct_addr_and_bit(&fix, addr);
+	max += fix;
+	start += fix;
+
+	return ext4_find_next_bit(addr, max, start) - fix;
+}
+
 static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
 {
 	char *bb;
@@ -906,7 +924,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb,
 	unsigned short chunk;
 	unsigned short border;
 
-	BUG_ON(len >= EXT4_BLOCKS_PER_GROUP(sb));
+	BUG_ON(len > EXT4_BLOCKS_PER_GROUP(sb));
 
 	border = 2 << sb->s_blocksize_bits;
 
@@ -946,12 +964,12 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
 
 	/* initialize buddy from bitmap which is aggregation
 	 * of on-disk bitmap and preallocations */
-	i = ext4_find_next_zero_bit(bitmap, max, 0);
+	i = mb_find_next_zero_bit(bitmap, max, 0);
 	grp->bb_first_free = i;
 	while (i < max) {
 		fragments++;
 		first = i;
-		i = ext4_find_next_bit(bitmap, max, i);
+		i = mb_find_next_bit(bitmap, max, i);
 		len = i - first;
 		free += len;
 		if (len > 1)
@@ -959,7 +977,7 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
 		else
 			grp->bb_counters[0]++;
 		if (i < max)
-			i = ext4_find_next_zero_bit(bitmap, max, i);
+			i = mb_find_next_zero_bit(bitmap, max, i);
 	}
 	grp->bb_fragments = fragments;
 
@@ -967,6 +985,10 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
 		ext4_error(sb, __FUNCTION__,
 			"EXT4-fs: group %lu: %u blocks in bitmap, %u in gd\n",
 			group, free, grp->bb_free);
+		/*
+		 * If we intent to continue, we consider group descritor
+		 * corrupt and update bb_free using bitmap value
+		 */
 		grp->bb_free = free;
 	}
 
@@ -1778,7 +1800,7 @@ static void ext4_mb_simple_scan_group(struct ext4_allocation_context *ac,
 		buddy = mb_find_buddy(e4b, i, &max);
 		BUG_ON(buddy == NULL);
 
-		k = ext4_find_next_zero_bit(buddy, max, 0);
+		k = mb_find_next_zero_bit(buddy, max, 0);
 		BUG_ON(k >= max);
 
 		ac->ac_found++;
@@ -1818,11 +1840,11 @@ static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
 	i = e4b->bd_info->bb_first_free;
 
 	while (free && ac->ac_status == AC_STATUS_CONTINUE) {
-		i = ext4_find_next_zero_bit(bitmap,
+		i = mb_find_next_zero_bit(bitmap,
 						EXT4_BLOCKS_PER_GROUP(sb), i);
 		if (i >= EXT4_BLOCKS_PER_GROUP(sb)) {
 			/*
-			 * IF we corrupt the bitmap  we won't find any
+			 * IF we have corrupt bitmap, we won't find any
 			 * free blocks even though group info says we
 			 * we have free blocks
 			 */
@@ -1838,6 +1860,12 @@ static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
 			ext4_error(sb, __FUNCTION__, "%d free blocks as per "
 					"group info. But got %d blocks\n",
 					free, ex.fe_len);
+			/*
+			 * The number of free blocks differs. This mostly
+			 * indicate that the bitmap is corrupt. So exit
+			 * without claiming the space.
+			 */
+			break;
 		}
 
 		ext4_mb_measure_extent(ac, &ex, e4b);
@@ -3740,10 +3768,10 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
 	}
 
 	while (bit < end) {
-		bit = ext4_find_next_zero_bit(bitmap_bh->b_data, end, bit);
+		bit = mb_find_next_zero_bit(bitmap_bh->b_data, end, bit);
 		if (bit >= end)
 			break;
-		next = ext4_find_next_bit(bitmap_bh->b_data, end, bit);
+		next = mb_find_next_bit(bitmap_bh->b_data, end, bit);
 		if (next > end)
 			next = end;
 		start = group * EXT4_BLOCKS_PER_GROUP(sb) + bit +
@@ -3771,6 +3799,10 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
 			(unsigned long) pa->pa_len);
 		ext4_error(sb, __FUNCTION__, "free %u, pa_free %u\n",
 						free, pa->pa_free);
+		/*
+		 * pa is already deleted so we use the value obtained
+		 * from the bitmap and continue.
+		 */
 	}
 	atomic_add(free, &sbi->s_mb_discarded);
 	if (ac)
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index 8c6c685b9d22..5c1e27de7755 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -43,6 +43,7 @@ static int finish_range(handle_t *handle, struct inode *inode,
 
 	if (IS_ERR(path)) {
 		retval = PTR_ERR(path);
+		path = NULL;
 		goto err_out;
 	}
 
@@ -74,6 +75,10 @@ static int finish_range(handle_t *handle, struct inode *inode,
 	}
 	retval = ext4_ext_insert_extent(handle, inode, path, &newext);
 err_out:
+	if (path) {
+		ext4_ext_drop_refs(path);
+		kfree(path);
+	}
 	lb->first_pblock = 0;
 	return retval;
 }
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index a9347fb43bcc..28aa2ed4297e 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1804,12 +1804,8 @@ retry:
 	inode->i_fop = &ext4_dir_operations;
 	inode->i_size = EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
 	dir_block = ext4_bread (handle, inode, 0, 1, &err);
-	if (!dir_block) {
-		ext4_dec_count(handle, inode); /* is this nlink == 0? */
-		ext4_mark_inode_dirty(handle, inode);
-		iput (inode);
-		goto out_stop;
-	}
+	if (!dir_block)
+		goto out_clear_inode;
 	BUFFER_TRACE(dir_block, "get_write_access");
 	ext4_journal_get_write_access(handle, dir_block);
 	de = (struct ext4_dir_entry_2 *) dir_block->b_data;
@@ -1832,7 +1828,8 @@ retry:
 	ext4_mark_inode_dirty(handle, inode);
 	err = ext4_add_entry (handle, dentry, inode);
 	if (err) {
-		inode->i_nlink = 0;
+out_clear_inode:
+		clear_nlink(inode);
 		ext4_mark_inode_dirty(handle, inode);
 		iput (inode);
 		goto out_stop;
@@ -2164,7 +2161,7 @@ static int ext4_unlink(struct inode * dir, struct dentry *dentry)
 	dir->i_ctime = dir->i_mtime = ext4_current_time(dir);
 	ext4_update_dx_flag(dir);
 	ext4_mark_inode_dirty(handle, dir);
-	ext4_dec_count(handle, inode);
+	drop_nlink(inode);
 	if (!inode->i_nlink)
 		ext4_orphan_add(handle, inode);
 	inode->i_ctime = ext4_current_time(inode);
@@ -2214,7 +2211,7 @@ retry:
 		err = __page_symlink(inode, symname, l,
 				mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
 		if (err) {
-			ext4_dec_count(handle, inode);
+			clear_nlink(inode);
 			ext4_mark_inode_dirty(handle, inode);
 			iput (inode);
 			goto out_stop;
@@ -2223,7 +2220,6 @@ retry:
 		inode->i_op = &ext4_fast_symlink_inode_operations;
 		memcpy((char*)&EXT4_I(inode)->i_data,symname,l);
 		inode->i_size = l-1;
-		EXT4_I(inode)->i_flags &= ~EXT4_EXTENTS_FL;
 	}
 	EXT4_I(inode)->i_disksize = inode->i_size;
 	err = ext4_add_nondir(handle, dentry, inode);
@@ -2407,7 +2403,7 @@ static int ext4_rename (struct inode * old_dir, struct dentry *old_dentry,
 		ext4_dec_count(handle, old_dir);
 		if (new_inode) {
 			/* checked empty_dir above, can't have another parent,
-			 * ext3_dec_count() won't work for many-linked dirs */
+			 * ext4_dec_count() won't work for many-linked dirs */
 			new_inode->i_nlink = 0;
 		} else {
 			ext4_inc_count(handle, new_dir);
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 9477a2bd6ff2..e29efa0f9d62 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1037,6 +1037,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
 		ext4_warning(sb, __FUNCTION__,
 			     "multiple resizers run on filesystem!");
 		unlock_super(sb);
+		ext4_journal_stop(handle);
 		err = -EBUSY;
 		goto exit_put;
 	}
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 96ee899d6502..91a1bd67ac1d 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -314,9 +314,12 @@ static int proc_pid_schedstat(struct task_struct *task, char *buffer)
 static int lstats_show_proc(struct seq_file *m, void *v)
 {
 	int i;
-	struct task_struct *task = m->private;
-	seq_puts(m, "Latency Top version : v0.1\n");
+	struct inode *inode = m->private;
+	struct task_struct *task = get_proc_task(inode);
 
+	if (!task)
+		return -ESRCH;
+	seq_puts(m, "Latency Top version : v0.1\n");
 	for (i = 0; i < 32; i++) {
 		if (task->latency_record[i].backtrace[0]) {
 			int q;
@@ -341,32 +344,24 @@ static int lstats_show_proc(struct seq_file *m, void *v)
 		}
 
 	}
+	put_task_struct(task);
 	return 0;
 }
 
 static int lstats_open(struct inode *inode, struct file *file)
 {
-	int ret;
-	struct seq_file *m;
-	struct task_struct *task = get_proc_task(inode);
-
-	ret = single_open(file, lstats_show_proc, NULL);
-	if (!ret) {
-		m = file->private_data;
-		m->private = task;
-	}
-	return ret;
+	return single_open(file, lstats_show_proc, inode);
 }
 
 static ssize_t lstats_write(struct file *file, const char __user *buf,
 			    size_t count, loff_t *offs)
 {
-	struct seq_file *m;
-	struct task_struct *task;
+	struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
 
-	m = file->private_data;
-	task = m->private;
+	if (!task)
+		return -ESRCH;
 	clear_all_latency_tracing(task);
+	put_task_struct(task);
 
 	return count;
 }
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 21dfc9da235e..8831d9518790 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -171,7 +171,7 @@ xfs_parseargs(
 	char			*this_char, *value, *eov;
 	int			dsunit, dswidth, vol_dsunit, vol_dswidth;
 	int			iosize;
-	int			ikeep = 0;
+	int			dmapi_implies_ikeep = 1;
 
 	args->flags |= XFSMNT_BARRIER;
 	args->flags2 |= XFSMNT2_COMPAT_IOSIZE;
@@ -302,10 +302,10 @@ xfs_parseargs(
 		} else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
 			args->flags &= ~XFSMNT_BARRIER;
 		} else if (!strcmp(this_char, MNTOPT_IKEEP)) {
-			ikeep = 1;
-			args->flags &= ~XFSMNT_IDELETE;
+			args->flags |= XFSMNT_IKEEP;
 		} else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
-			args->flags |= XFSMNT_IDELETE;
+			dmapi_implies_ikeep = 0;
+			args->flags &= ~XFSMNT_IKEEP;
 		} else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
 			args->flags2 &= ~XFSMNT2_COMPAT_IOSIZE;
 		} else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
@@ -410,8 +410,8 @@ xfs_parseargs(
 	 * Note that if "ikeep" or "noikeep" mount options are
 	 * supplied, then they are honored.
 	 */
-	if (!(args->flags & XFSMNT_DMAPI) && !ikeep)
-		args->flags |= XFSMNT_IDELETE;
+	if ((args->flags & XFSMNT_DMAPI) && dmapi_implies_ikeep)
+		args->flags |= XFSMNT_IKEEP;
 
 	if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
 		if (dsunit) {
@@ -446,6 +446,7 @@ xfs_showargs(
 {
 	static struct proc_xfs_info xfs_info_set[] = {
 		/* the few simple ones we can get from the mount struct */
+		{ XFS_MOUNT_IKEEP,		"," MNTOPT_IKEEP },
 		{ XFS_MOUNT_WSYNC,		"," MNTOPT_WSYNC },
 		{ XFS_MOUNT_INO64,		"," MNTOPT_INO64 },
 		{ XFS_MOUNT_NOALIGN,		"," MNTOPT_NOALIGN },
@@ -461,7 +462,6 @@ xfs_showargs(
 	};
 	static struct proc_xfs_info xfs_info_unset[] = {
 		/* the few simple ones we can get from the mount struct */
-		{ XFS_MOUNT_IDELETE,		"," MNTOPT_IKEEP },
 		{ XFS_MOUNT_COMPAT_IOSIZE,	"," MNTOPT_LARGEIO },
 		{ XFS_MOUNT_BARRIER,		"," MNTOPT_NOBARRIER },
 		{ XFS_MOUNT_SMALL_INUMS,	"," MNTOPT_64BITINODE },
diff --git a/fs/xfs/xfs_bit.c b/fs/xfs/xfs_bit.c
index 48228848f5ae..fab0b6d5a41b 100644
--- a/fs/xfs/xfs_bit.c
+++ b/fs/xfs/xfs_bit.c
@@ -25,6 +25,109 @@
  * XFS bit manipulation routines, used in non-realtime code.
  */
 
+#ifndef HAVE_ARCH_HIGHBIT
+/*
+ * Index of high bit number in byte, -1 for none set, 0..7 otherwise.
+ */
+static const char xfs_highbit[256] = {
+       -1, 0, 1, 1, 2, 2, 2, 2,			/* 00 .. 07 */
+	3, 3, 3, 3, 3, 3, 3, 3,			/* 08 .. 0f */
+	4, 4, 4, 4, 4, 4, 4, 4,			/* 10 .. 17 */
+	4, 4, 4, 4, 4, 4, 4, 4,			/* 18 .. 1f */
+	5, 5, 5, 5, 5, 5, 5, 5,			/* 20 .. 27 */
+	5, 5, 5, 5, 5, 5, 5, 5,			/* 28 .. 2f */
+	5, 5, 5, 5, 5, 5, 5, 5,			/* 30 .. 37 */
+	5, 5, 5, 5, 5, 5, 5, 5,			/* 38 .. 3f */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 40 .. 47 */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 48 .. 4f */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 50 .. 57 */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 58 .. 5f */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 60 .. 67 */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 68 .. 6f */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 70 .. 77 */
+	6, 6, 6, 6, 6, 6, 6, 6,			/* 78 .. 7f */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* 80 .. 87 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* 88 .. 8f */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* 90 .. 97 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* 98 .. 9f */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* a0 .. a7 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* a8 .. af */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* b0 .. b7 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* b8 .. bf */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* c0 .. c7 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* c8 .. cf */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* d0 .. d7 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* d8 .. df */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* e0 .. e7 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* e8 .. ef */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* f0 .. f7 */
+	7, 7, 7, 7, 7, 7, 7, 7,			/* f8 .. ff */
+};
+#endif
+
+/*
+ * xfs_highbit32: get high bit set out of 32-bit argument, -1 if none set.
+ */
+inline int
+xfs_highbit32(
+	__uint32_t	v)
+{
+#ifdef HAVE_ARCH_HIGHBIT
+	return highbit32(v);
+#else
+	int		i;
+
+	if (v & 0xffff0000)
+		if (v & 0xff000000)
+			i = 24;
+		else
+			i = 16;
+	else if (v & 0x0000ffff)
+		if (v & 0x0000ff00)
+			i = 8;
+		else
+			i = 0;
+	else
+		return -1;
+	return i + xfs_highbit[(v >> i) & 0xff];
+#endif
+}
+
+/*
+ * xfs_lowbit64: get low bit set out of 64-bit argument, -1 if none set.
+ */
+int
+xfs_lowbit64(
+	__uint64_t	v)
+{
+	__uint32_t	w = (__uint32_t)v;
+	int		n = 0;
+
+	if (w) {	/* lower bits */
+		n = ffs(w);
+	} else {	/* upper bits */
+		w = (__uint32_t)(v >> 32);
+		if (w && (n = ffs(w)))
+			n += 32;
+	}
+	return n - 1;
+}
+
+/*
+ * xfs_highbit64: get high bit set out of 64-bit argument, -1 if none set.
+ */
+int
+xfs_highbit64(
+	__uint64_t	v)
+{
+	__uint32_t	h = (__uint32_t)(v >> 32);
+
+	if (h)
+		return xfs_highbit32(h) + 32;
+	return xfs_highbit32((__uint32_t)v);
+}
+
+
 /*
  * Return whether bitmap is empty.
  * Size is number of words in the bitmap, which is padded to word boundary
diff --git a/fs/xfs/xfs_bit.h b/fs/xfs/xfs_bit.h
index 325a007dec91..082641a9782c 100644
--- a/fs/xfs/xfs_bit.h
+++ b/fs/xfs/xfs_bit.h
@@ -47,30 +47,13 @@ static inline __uint64_t xfs_mask64lo(int n)
 }
 
 /* Get high bit set out of 32-bit argument, -1 if none set */
-static inline int xfs_highbit32(__uint32_t v)
-{
-	return fls(v) - 1;
-}
-
-/* Get high bit set out of 64-bit argument, -1 if none set */
-static inline int xfs_highbit64(__uint64_t v)
-{
-	return fls64(v) - 1;
-}
-
-/* Get low bit set out of 32-bit argument, -1 if none set */
-static inline int xfs_lowbit32(__uint32_t v)
-{
-	__uint32_t t = v;
-	return (t) ? find_first_bit((unsigned long *)&t, 32) : -1;
-}
+extern int xfs_highbit32(__uint32_t v);
 
 /* Get low bit set out of 64-bit argument, -1 if none set */
-static inline int xfs_lowbit64(__uint64_t v)
-{
-	__uint64_t t = v;
-	return (t) ? find_first_bit((unsigned long *)&t, 64) : -1;
-}
+extern int xfs_lowbit64(__uint64_t v);
+
+/* Get high bit set out of 64-bit argument, -1 if none set */
+extern int xfs_highbit64(__uint64_t);
 
 /* Return whether bitmap is empty (1 == empty) */
 extern int xfs_bitmap_empty(uint *map, uint size);
diff --git a/fs/xfs/xfs_clnt.h b/fs/xfs/xfs_clnt.h
index d16c1b971074..d5d1e60ee224 100644
--- a/fs/xfs/xfs_clnt.h
+++ b/fs/xfs/xfs_clnt.h
@@ -86,7 +86,7 @@ struct xfs_mount_args {
 #define XFSMNT_NOUUID		0x01000000	/* Ignore fs uuid */
 #define XFSMNT_DMAPI		0x02000000	/* enable dmapi/xdsm */
 #define XFSMNT_BARRIER		0x04000000	/* use write barriers */
-#define XFSMNT_IDELETE		0x08000000	/* inode cluster delete */
+#define XFSMNT_IKEEP		0x08000000	/* inode cluster delete */
 #define XFSMNT_SWALLOC		0x10000000	/* turn on stripe width
 						 * allocation */
 #define XFSMNT_DIRSYNC		0x40000000	/* sync creat,link,unlink,rename
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index c5836b951d0c..db9d5fa600af 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -1053,7 +1053,7 @@ xfs_difree(
 	/*
 	 * When an inode cluster is free, it becomes eligible for removal
 	 */
-	if ((mp->m_flags & XFS_MOUNT_IDELETE) &&
+	if (!(mp->m_flags & XFS_MOUNT_IKEEP) &&
 	    (rec.ir_freecount == XFS_IALLOC_INODES(mp))) {
 
 		*delete = 1;
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index f7c620ec6e69..1d8a4728d847 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -366,7 +366,7 @@ typedef struct xfs_mount {
 #define XFS_MOUNT_SMALL_INUMS	(1ULL << 15)	/* users wants 32bit inodes */
 #define XFS_MOUNT_NOUUID	(1ULL << 16)	/* ignore uuid during mount */
 #define XFS_MOUNT_BARRIER	(1ULL << 17)
-#define XFS_MOUNT_IDELETE	(1ULL << 18)	/* delete empty inode clusters*/
+#define XFS_MOUNT_IKEEP		(1ULL << 18)	/* keep empty inode clusters*/
 #define XFS_MOUNT_SWALLOC	(1ULL << 19)	/* turn on stripe width
 						 * allocation */
 #define XFS_MOUNT_RDONLY	(1ULL << 20)	/* read-only fs */
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index ca83ddf72af4..47082c01872d 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -73,6 +73,18 @@ STATIC int xfs_rtmodify_summary(xfs_mount_t *, xfs_trans_t *, int,
  */
 
 /*
+ * xfs_lowbit32: get low bit set out of 32-bit argument, -1 if none set.
+ */
+STATIC int
+xfs_lowbit32(
+	__uint32_t	v)
+{
+	if (v)
+		return ffs(v) - 1;
+	return -1;
+}
+
+/*
  * Allocate space to the bitmap or summary file, and zero it, for growfs.
  */
 STATIC int				/* error */
@@ -432,7 +444,6 @@ xfs_rtallocate_extent_near(
 	}
 	bbno = XFS_BITTOBLOCK(mp, bno);
 	i = 0;
-	ASSERT(minlen != 0);
 	log2len = xfs_highbit32(minlen);
 	/*
 	 * Loop over all bitmap blocks (bbno + i is current block).
@@ -601,8 +612,6 @@ xfs_rtallocate_extent_size(
 	xfs_suminfo_t	sum;		/* summary information for extents */
 
 	ASSERT(minlen % prod == 0 && maxlen % prod == 0);
-	ASSERT(maxlen != 0);
-
 	/*
 	 * Loop over all the levels starting with maxlen.
 	 * At each level, look at all the bitmap blocks, to see if there
@@ -660,9 +669,6 @@ xfs_rtallocate_extent_size(
 		*rtblock = NULLRTBLOCK;
 		return 0;
 	}
-	ASSERT(minlen != 0);
-	ASSERT(maxlen != 0);
-
 	/*
 	 * Loop over sizes, from maxlen down to minlen.
 	 * This time, when we do the allocations, allow smaller ones
@@ -1948,7 +1954,6 @@ xfs_growfs_rt(
 				  nsbp->sb_blocksize * nsbp->sb_rextsize);
 		nsbp->sb_rextents = nsbp->sb_rblocks;
 		do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
-		ASSERT(nsbp->sb_rextents != 0);
 		nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
 		nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
 		nrsumsize =
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c
index 413587f02155..7321304a69cc 100644
--- a/fs/xfs/xfs_vfsops.c
+++ b/fs/xfs/xfs_vfsops.c
@@ -281,8 +281,8 @@ xfs_start_flags(
 		mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
 	}
 
-	if (ap->flags & XFSMNT_IDELETE)
-		mp->m_flags |= XFS_MOUNT_IDELETE;
+	if (ap->flags & XFSMNT_IKEEP)
+		mp->m_flags |= XFS_MOUNT_IKEEP;
 	if (ap->flags & XFSMNT_DIRSYNC)
 		mp->m_flags |= XFS_MOUNT_DIRSYNC;
 	if (ap->flags & XFSMNT_ATTR2)