[dm-devel] [PATCH] dm-snapshot: flush disk cache when merging
Mikulas Patocka
mpatocka at redhat.com
Wed Jun 8 22:02:12 UTC 2011
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 at redhat.com>
---
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;
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