ext4: Don't add the inode to journal handle until after the block is allocated
    
Make sure we don't add the inode to the journal handle until after the
block allocation, so that a journal commit will not include the inode in
case of block allocation failure.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index ae26c37..cca7fd5 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -2063,7 +2063,7 @@
 	/*
 	 * Account for the allocated meta blocks
 	 */
-	if (!(*errp)) {
+	if (!(*errp) && EXT4_I(inode)->i_delalloc_reserved_flag) {
 		spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
 		EXT4_I(inode)->i_allocated_meta_blocks += *count;
 		spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);