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>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index ab5cff502f5b..e201f6f82c0e 100644
--- 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);