drbd: only reset online-verify start sector if verify completed

For network hickups during online-verify, on the next verify
triggered, we by default want to resume where it left off.

After any replication link interruption, there will be a (possibly
empty) resync.  Do not reset online-verify start sector if some resync
completed, that would defeats the purpose.

Only reset the start sector once a verify run is completed.

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

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index e027446590d3..6cfc5417da8e 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -782,6 +782,7 @@ int drbd_resync_finished(struct drbd_conf *mdev)
         union drbd_state os, ns;
         struct drbd_work *w;
         char *khelper_cmd = NULL;
+        int verify_done = 0;
 
         /* Remove all elements from the resync LRU. Since future actions
          * might set bits in the (main) bitmap, then the entries in the
@@ -818,6 +819,8 @@ int drbd_resync_finished(struct drbd_conf *mdev)
         spin_lock_irq(&mdev->req_lock);
         os = mdev->state;
 
+        verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T);
+
         /* This protects us against multiple calls (that can happen in the presence
            of application IO), and against connectivity loss just before we arrive here. */
         if (os.conn <= C_CONNECTED)
@@ -827,8 +830,7 @@ int drbd_resync_finished(struct drbd_conf *mdev)
         ns.conn = C_CONNECTED;
 
         dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n",
-             (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) ?
-             "Online verify " : "Resync",
+             verify_done ? "Online verify " : "Resync",
              dt + mdev->rs_paused, mdev->rs_paused, dbdt);
 
         n_oos = drbd_bm_total_weight(mdev);
@@ -905,7 +907,8 @@ out:
         mdev->rs_total  = 0;
         mdev->rs_failed = 0;
         mdev->rs_paused = 0;
-        mdev->ov_start_sector = 0;
+        if (verify_done)
+                mdev->ov_start_sector = 0;
 
         drbd_md_sync(mdev);