linux-kernel - [ 44/48] lockd: Try to reconnect if statd has moved

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Date:	Fri, 15 May 2015 10:06:14 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Benjamin Coddington <bcodding@...hat.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [ 44/48] lockd: Try to reconnect if statd has moved

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin Coddington <bcodding@...hat.com>

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

Signed-off-by: Willy Tarreau <w@....eu>
---
 fs/lockd/mon.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index f956651..48de6a5 100644
--- 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);
-- 
1.7.12.2.21.g234cd45.dirty



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