drbd: we should write meta data updates with FLUSH FUA
We used to write these with BIO_RW_BARRIER aka REQ_HARDBARRIER (unless
disabled in the configuration). The correct semantic now would be to
write with FLUSH/FUA.
For example, with activity log transactions, FUA alone is not enough, we
need the corresponding bitmap update (and all related application
updates) on stable storage as well.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 09ef9a8..cf0e63d 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -79,7 +79,7 @@
md_io.error = 0;
if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))
- rw |= REQ_FUA;
+ rw |= REQ_FUA | REQ_FLUSH;
rw |= REQ_SYNC;
bio = bio_alloc(GFP_NOIO, 1);