Messages in this thread Patch in this message | | | Date | Wed, 03 Aug 2011 15:02:00 -0700 | From | Greg KH <> | Subject | [100/102] dm snapshot: flush disk cache when merging |
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3.0-stable review patch. If anyone has any objections, please let us know.
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From: Mikulas Patocka <mpatocka@redhat.com>
commit 762a80d9fc9f690a3a35983f3b4619a220650808 upstream.
This patch makes dm-snapshot flush disk cache when writing metadata for merging snapshot.
Without cache flushing the disk may reorder metadata write and other data writes and there is a possibility of data corruption in case of power fault.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/md/dm-snap-persistent.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -753,7 +753,7 @@ static int persistent_commit_merge(struc for (i = 0; i < nr_merged; i++) clear_exception(ps, ps->current_committed - 1 - i); - r = area_io(ps, WRITE); + r = area_io(ps, WRITE_FLUSH_FUA); if (r < 0) return r;
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