lockd: ratelimit "lockd: cannot monitor" messages

When lockd can't talk to a remote statd, it'll spew a warning message
to the ring buffer. If the application is really hammering on locks
however, it's possible for that message to spam the logs. Ratelimit it
to minimize the potential for harm.

Reported-by: Ian Collier <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>

fs/lockd/mon.c

@@ -214,7 +214,7 @@ int nsm_monitor(const struct nlm_host *host)
 	if (unlikely(res.status != 0))
 		status = -EIO;
 	if (unlikely(status < 0)) {
-		printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
+		pr_notice_ratelimited("lockd: cannot monitor %s\n", nsm->sm_name);
 		return status;
 	}