drbd: New handler: initial-split-brain

Some wish to be notified of all instances of split brain, not just those that
go unresolved.  The initial-split-brain handler is called to notify someone
upon  detection of all split brain conditions even if auto-recovery policies
are configured.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 3a36bc814e77..6876041fc3d8 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2487,6 +2487,9 @@ static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_rol
                      hg > 0 ? "source" : "target");
         }
 
+        if (abs(hg) == 100)
+                drbd_khelper(mdev, "initial-split-brain");
+
         if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) {
                 int pcount = (mdev->state.role == R_PRIMARY)
                            + (peer_role == R_PRIMARY);
@@ -2532,7 +2535,7 @@ static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_rol
                  * after an attempted attach on a diskless node.
                  * We just refuse to attach -- well, we drop the "connection"
                  * to that disk, in a way... */
-                dev_alert(DEV, "Split-Brain detected, dropping connection!\n");
+                dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n");
                 drbd_khelper(mdev, "split-brain");
                 return C_MASK;
         }