| From 762a80d9fc9f690a3a35983f3b4619a220650808 Mon Sep 17 00:00:00 2001 |
| From: Mikulas Patocka <mpatocka@redhat.com> |
| Date: Tue, 2 Aug 2011 12:32:00 +0100 |
| Subject: dm snapshot: flush disk cache when merging |
| |
| 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; |
| |
