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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
This commit is contained in:
Jiaying Zhang 2011-07-10 20:07:25 -04:00 committed by Theodore Ts'o
parent 7132de744b
commit 575a1d4bdf
1 changed files with 3 additions and 4 deletions
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7
fs/ext4/extents.c
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@ -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;