drbd: Disallow the peer_disk_state to be D_OUTDATED while connected

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index fd308864833f..ce6a764e905b 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -745,6 +745,9 @@ is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
                   mdev->agreed_pro_version < 88)
                 rv = SS_NOT_SUPPORTED;
 
+        else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN)
+                rv = SS_CONNECTED_OUTDATES;
+
         return rv;
 }