drbd: Ensure to not trigger late-new-UUID creation multiple times

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 7e057b0..a949fc4 100644 (file)
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1217,7 +1217,8 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
                mdev->p_uuid = NULL;
                if (get_ldev(mdev)) {
                        if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
-                           mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE)
+                           mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE &&
+                           !atomic_read(&mdev->new_c_uuid))
                                atomic_set(&mdev->new_c_uuid, 2);
                        put_ldev(mdev);
                }
@@ -1225,7 +1226,8 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
 
        if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
                /* Diskless peer becomes primary or got connected do diskless, primary peer. */
-               if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0)
+               if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0 &&
+                   !atomic_read(&mdev->new_c_uuid))
                        atomic_set(&mdev->new_c_uuid, 2);
 
                /* D_DISKLESS Peer becomes secondary */
@@ -1353,12 +1355,14 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
 static int w_new_current_uuid(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
 {
        if (get_ldev(mdev)) {
-               drbd_uuid_new_current(mdev);
-               if (get_net_conf(mdev)) {
-                       drbd_send_uuids(mdev);
-                       put_net_conf(mdev);
+               if (mdev->ldev->md.uuid[UI_BITMAP] == 0) {
+                       drbd_uuid_new_current(mdev);
+                       if (get_net_conf(mdev)) {
+                               drbd_send_uuids(mdev);
+                               put_net_conf(mdev);
+                       }
+                       drbd_md_sync(mdev);
                }
-               drbd_md_sync(mdev);
                put_ldev(mdev);
        }
        atomic_dec(&mdev->new_c_uuid);