drbd: respect no-md-barriers setting also when changed online via disk-options

We need to propagate the configuration into the flag bits,
or it won't be effective.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 76bb3a684b86..536f94a1ba5d 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1230,6 +1230,11 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
         else
                 mdev->ldev->md.flags |= MDF_AL_DISABLED;
 
+        if (new_disk_conf->md_flushes)
+                clear_bit(MD_NO_FUA, &mdev->flags);
+        else
+                set_bit(MD_NO_FUA, &mdev->flags);
+
         drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush);
 
         drbd_md_sync(mdev);