drbd: Delayed creation of current-UUID

When a fencing policy of "resource-and-stonith" is configured,
and DRBD looses connection to it's peer, we can delay the
creation of a new current-UUID until IO gets thawed.

That allows one to deploy fence-peer handlers that actually
commit suicide on the machine they get started.

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 32d00720470b..d764f3cd5866 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1810,6 +1810,11 @@ static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nl
 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
                              struct drbd_nl_cfg_reply *reply)
 {
+        if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
+                drbd_uuid_new_current(mdev);
+                clear_bit(NEW_CUR_UUID, &mdev->flags);
+                drbd_md_sync(mdev);
+        }
         drbd_suspend_io(mdev);
         reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
         if (reply->ret_code == SS_SUCCESS) {