drbd: fix regression: attach while connected failed

commit e4f925e12ea5daaa9baf2dd5af9c4951721dae95
Author: Philipp Reisner <philipp.reisner@linbit.com>
Date:   Wed Mar 17 14:18:41 2010 +0100

    drbd: Do not upgrade state to Outdated if already Inconsistent

prevented the necessary state transition for attaching while connected
(Diskless -> Consistent respectively Outdated).
This is the fix for the fix.

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

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 8f84a9f58c99..b1ce5dc7c603 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -840,7 +840,12 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state
                         break;
                 case C_WF_BITMAP_S:
                 case C_PAUSED_SYNC_S:
-                        ns.pdsk = os.pdsk > D_OUTDATED ? D_OUTDATED : os.pdsk;
+                        /* remap any consistent state to D_OUTDATED,
+                         * but disallow "upgrade" of not even consistent states.
+                         */
+                        ns.pdsk =
+                                (D_DISKLESS < os.pdsk && os.pdsk < D_OUTDATED)
+                                ? os.pdsk : D_OUTDATED;
                         break;
                 case C_SYNC_SOURCE:
                         ns.pdsk = D_INCONSISTENT;