libceph: un-backoff on tick when we have a authenticated session

This means that if we do some backoff, then authenticate, and are
healthy for an extended period of time, a subsequent failure won't
leave us starting our hunting sequence with a large backoff.

Mirrors ceph.git commit d466bc6e66abba9b464b0b69687cf45c9dccf383.

Cc: stable@vger.kernel.org # 4.7+
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>

diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c
index b3dac24..02c441c 100644 (file)
--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -209,6 +209,14 @@ static void reopen_session(struct ceph_mon_client *monc)
        __open_session(monc);
 }
 
+static void un_backoff(struct ceph_mon_client *monc)
+{
+       monc->hunt_mult /= 2; /* reduce by 50% */
+       if (monc->hunt_mult < 1)
+               monc->hunt_mult = 1;
+       dout("%s hunt_mult now %d\n", __func__, monc->hunt_mult);
+}
+
 /*
  * Reschedule delayed work timer.
  */
@@ -963,6 +971,7 @@ static void delayed_work(struct work_struct *work)
                if (!monc->hunting) {
                        ceph_con_keepalive(&monc->con);
                        __validate_auth(monc);
+                       un_backoff(monc);
                }
 
                if (is_auth &&
@@ -1123,9 +1132,7 @@ static void finish_hunting(struct ceph_mon_client *monc)
                dout("%s found mon%d\n", __func__, monc->cur_mon);
                monc->hunting = false;
                monc->had_a_connection = true;
-               monc->hunt_mult /= 2; /* reduce by 50% */
-               if (monc->hunt_mult < 1)
-                       monc->hunt_mult = 1;
+               un_backoff(monc);
        }
 }