rbd: release client list lock sooner

In rbd_get_client(), if a client is reused, a number of things
get done while still holding the list lock unnecessarily.

This just moves a few things that need no lock protection outside
the lock.
Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>

drivers/block/rbd.c

@@ -383,13 +383,15 @@ static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr,
 	spin_lock(&node_lock);
 	rbdc = __rbd_client_find(opt);
 	if (rbdc) {
-		ceph_destroy_options(opt);
-		kfree(rbd_opts);
-
 		/* using an existing client */
 		kref_get(&rbdc->kref);
-		rbd_dev->rbd_client = rbdc;
 		spin_unlock(&node_lock);
+
+		rbd_dev->rbd_client = rbdc;
+
+		ceph_destroy_options(opt);
+		kfree(rbd_opts);
+
 		return 0;
 	}
 	spin_unlock(&node_lock);