lockd: Try to reconnect if statd has moved

commit 173b3afceebe76fa2205b2c8808682d5b541fe3c upstream.

If rpc.statd is restarted, upcalls to monitor hosts can fail with
ECONNREFUSED.  In that case force a lookup of statd's new port and retry the
upcall.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
[bwh: Backported to 3.2: not using RPC_TASK_SOFTCONN]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit 3aabe891f32c209a2be7cd5581d2634020e801c1)

Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index f956651d0f651a66a00d4bb9a1d05febf761d524..48de6a5c0004875196e4406f9ad1bf6a08d7533d 100644 (file)
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -109,6 +109,12 @@ static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
 
        msg.rpc_proc = &clnt->cl_procinfo[proc];
        status = rpc_call_sync(clnt, &msg, 0);
+       if (status == -ECONNREFUSED) {
+               dprintk("lockd: NSM upcall RPC failed, status=%d, forcing rebind\n",
+                               status);
+               rpc_force_rebind(clnt);
+               status = rpc_call_sync(clnt, &msg, 0);
+       }
        if (status < 0)
                dprintk("lockd: NSM upcall RPC failed, status=%d\n",
                                status);