drbd: introduce stop-sector to online verify

We now can schedule only a specific range of sectors for online verify,
or interrupt a running verify without interrupting the connection.

Had to bump the protocol version differently, we are now 101.
Added verify_can_do_stop_sector() { protocol >= 97 && protocol != 100; }

Also, the return value convention for worker callbacks has changed,
we returned "true/false" for "keep the connection up" in 8.3,
we return 0 for success and <= for failure in 8.4.
Affected: receive_state()

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

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 7fe6b01618d4..8fddec96dfbe 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3843,7 +3843,7 @@ static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi)
          * already decided to close the connection again,
          * we must not "re-establish" it here. */
         if (os.conn <= C_TEAR_DOWN)
-                return false;
+                return -ECONNRESET;
 
         /* If this is the "end of sync" confirmation, usually the peer disk
          * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits
@@ -3875,6 +3875,14 @@ static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi)
                 }
         }
 
+        /* explicit verify finished notification, stop sector reached. */
+        if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE &&
+            peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) {
+                ov_out_of_sync_print(mdev);
+                drbd_resync_finished(mdev);
+                return 0;
+        }
+
         /* peer says his disk is inconsistent, while we think it is uptodate,
          * and this happens while the peer still thinks we have a sync going on,
          * but we think we are already done with the sync.