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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2014-10-14 02:35:49 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-10-14 02:35:49 -0400 |
| commit | 813d32f91333e4c33d5a19b67167c4bae42dae75 (patch) | |
| tree | 09e1183d369c6b42a6fc3edcb73017ff54aa8a36 /fs/buffer.c | |
| parent | aef4885ae14f1df75b58395c5314d71f613d26d9 (diff) | |
| download | linux-813d32f91333e4c33d5a19b67167c4bae42dae75.tar.bz2 | |
ext4: check s_chksum_driver when looking for bg csum presence
Convert the ext4_has_group_desc_csum predicate to look for a checksum
driver instead of the metadata_csum flag and change the bg checksum
calculation function to look for GDT_CSUM before taking the crc16
path.
Without this patch, if we mount with ^uninit_bg,^metadata_csum and
later metadata_csum gets turned on by accident, the block group
checksum functions will incorrectly assume that checksumming is
enabled (metadata_csum) but that crc16 should be used
(!s_chksum_driver). This is totally wrong, so fix the predicate
and the checksum formula selection.
(Granted, if the metadata_csum feature bit gets enabled on a live FS
then something underhanded is going on, but we could at least avoid
writing garbage into the on-disk fields.)
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Dmitry Monakhov <dmonakhov@openvz.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/buffer.c')
0 files changed, 0 insertions, 0 deletions