When ext4_ext_insert_extent() fails to insert new blocks

we should free just the allocated blocks.

Signed-off-by: Alex Tomas <alex@clusterfs.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/extents.c

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 03c777a..b9ce2412 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2099,8 +2099,12 @@
 	ext4_ext_store_pblock(&newex, newblock);
 	newex.ee_len = cpu_to_le16(allocated);
 	err = ext4_ext_insert_extent(handle, inode, path, &newex);
-	if (err)
+	if (err) {
+		/* free data blocks we just allocated */
+		ext4_free_blocks(handle, inode, ext_pblock(&newex),
+					le16_to_cpu(newex.ee_len));
 		goto out2;
+	}
 
 	if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
 		EXT4_I(inode)->i_disksize = inode->i_size;