Files
linux/fs
Liu Bo 4be89529c0 Btrfs: fix unexpected cow in run_delalloc_nocow
commit 5811375325 upstream.

Fstests generic/475 provides a way to fail metadata reads while
checking if checksum exists for the inode inside run_delalloc_nocow(),
and csum_exist_in_range() interprets error (-EIO) as inode having
checksum and makes its caller enter the cow path.

In case of free space inode, this ends up with a warning in
cow_file_range().

The same problem applies to btrfs_cross_ref_exist() since it may also
read metadata in between.

With this, run_delalloc_nocow() bails out when errors occur at the two
places.

cc: <stable@vger.kernel.org> v2.6.28+
Fixes: 17d217fe97 ("Btrfs: fix nodatasum handling in balancing code")
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-08 14:26:32 +02:00
..
2017-12-14 09:53:14 +01:00
2017-11-30 08:40:45 +00:00
2017-09-04 19:05:15 -04:00
2017-11-30 08:40:53 +00:00
2018-02-03 17:38:53 +01:00