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dm snapshot: use barrier when writing exception store
authorMikulas Patocka <mpatocka@redhat.com>
Mon, 22 Jun 2009 09:12:26 +0000 (10:12 +0100)
committerAlasdair G Kergon <agk@redhat.com>
Mon, 22 Jun 2009 09:12:26 +0000 (10:12 +0100)
Send barrier requests when updating the exception area.

Exception area updates need to be ordered w.r.t. data writes, so that
the writes are not reordered in hardware disk cache.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
drivers/md/dm-snap-persistent.c patch | blob | blame | history

diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 2662a41337e7813b370df2d61dbfc70e964e066a..6e3fe4f14934811ddd0f9bba845ebdd4bb504036 100644 (file)
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -636,7 +636,7 @@ static void persistent_commit_exception(struct dm_exception_store *store,
        /*
         * Commit exceptions to disk.
         */
-       if (ps->valid && area_io(ps, WRITE))
+       if (ps->valid && area_io(ps, WRITE_BARRIER))
                ps->valid = 0;
 
        /*