ext4: free allocated and pre-allocated blocks when check_eofblocks_fl fails

Upon corrupted inode or disk failures, we may fail after we already
allocate some blocks from the inode or take some blocks from the
inode's preallocation list, but before we successfully insert the
corresponding extent to the extent tree. In this case, we should free
any allocated blocks and discard the inode's preallocated blocks
because the entries in the inode's preallocation list may be in an
inconsistent state.

Signed-off-by: Jiaying Zhang <jiayingz@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index a862138826555f8a7d832ce7baf189351fa7f44c..c969ae23a535d686ea037694d374b299dab783f6 100644 (file)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3560,10 +3560,9 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
        }
 
        err = check_eofblocks_fl(handle, inode, map->m_lblk, path, ar.len);
-       if (err)
-               goto out2;
-
-       err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
+       if (!err)
+               err = ext4_ext_insert_extent(handle, inode, path,
+                                            &newex, flags);
        if (err) {
                int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ?
                        EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0;