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. Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> --- drivers/md/dm-snap-persistent.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.39-fast/drivers/md/dm-snap-persistent.c =================================================================== --- linux-2.6.39-fast.orig/drivers/md/dm-snap-persistent.c 2011-06-08 23:56:49.000000000 +0200 +++ linux-2.6.39-fast/drivers/md/dm-snap-persistent.c 2011-06-08 23:59:05.000000000 +0200 @@ -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; -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
