drbd: Implemented the before-resync-source handler

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

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index ab5cff502f5b569fe7f1462b03805289d63e072f..e201f6f82c0eee4ba27595653e3a740263370e32 100644 (file)
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1499,6 +1499,20 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
                        drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
                        return;
                }
+       } else /* C_SYNC_SOURCE */ {
+               r = drbd_khelper(mdev, "before-resync-source");
+               r = (r >> 8) & 0xff;
+               if (r > 0) {
+                       if (r == 3) {
+                               dev_info(DEV, "before-resync-source handler returned %d, "
+                                        "ignoring. Old userland tools?", r);
+                       } else {
+                               dev_info(DEV, "before-resync-source handler returned %d, "
+                                        "dropping connection.\n", r);
+                               drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
+                               return;
+                       }
+               }
        }
 
        drbd_state_lock(mdev);