drbd: Reduce the time an empty resync takes usually

This mitigates changes introduced with commit:
http://git.drbd.org/?p=drbd-8.3.git;a=commit;h=4b6803a3276652da3737

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

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index d97a811ad0d..4672f2f37b5 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1289,6 +1289,14 @@ int drbd_alter_sa(struct drbd_conf *mdev, int na)
         return retcode;
 }
 
+static void ping_peer(struct drbd_conf *mdev)
+{
+        clear_bit(GOT_PING_ACK, &mdev->flags);
+        request_ping(mdev);
+        wait_event(mdev->misc_wait,
+                   test_bit(GOT_PING_ACK, &mdev->flags) || mdev->state.conn < C_CONNECTED);
+}
+
 /**
  * drbd_start_resync() - Start the resync process
  * @mdev:       DRBD device.
@@ -1383,9 +1391,7 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
 
                 if (mdev->rs_total == 0) {
                         /* Peer still reachable? Beware of failing before-resync-target handlers! */
-                        request_ping(mdev);
-                        __set_current_state(TASK_INTERRUPTIBLE);
-                        schedule_timeout(mdev->net_conf->ping_timeo*HZ/9); /* 9 instead 10 */
+                        ping_peer(mdev);
                         drbd_resync_finished(mdev);
                         return;
                 }