From: Mikulas Patocka Date: Tue, 2 Aug 2011 11:32:00 +0000 (+0100) Subject: dm snapshot: flush disk cache when merging X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=762a80d9fc9f690a3a35983f3b4619a220650808;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git dm snapshot: flush disk cache when merging 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. Cc: stable@kernel.org Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index 135c2f1fdbfc..e4ecadf0548a 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -753,7 +753,7 @@ static int persistent_commit_merge(struct dm_exception_store *store, 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;