+__maybe_unused static struct rpc_clnt *nsm_client_get(struct net *net)
+{
+ static DEFINE_MUTEX(nsm_create_mutex);
+ struct rpc_clnt *clnt;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ spin_lock(&ln->nsm_clnt_lock);
+ if (ln->nsm_users) {
+ ln->nsm_users++;
+ clnt = ln->nsm_clnt;
+ spin_unlock(&ln->nsm_clnt_lock);
+ goto out;
+ }
+ spin_unlock(&ln->nsm_clnt_lock);
+
+ mutex_lock(&nsm_create_mutex);
+ clnt = nsm_create(net);
+ if (!IS_ERR(clnt)) {
+ ln->nsm_clnt = clnt;
+ smp_wmb();
+ ln->nsm_users = 1;
+ }
+ mutex_unlock(&nsm_create_mutex);
+out:
+ return clnt;
+}
+
+__maybe_unused static void nsm_client_put(struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+ struct rpc_clnt *clnt = ln->nsm_clnt;
+ int shutdown = 0;
+
+ spin_lock(&ln->nsm_clnt_lock);
+ if (ln->nsm_users) {
+ if (--ln->nsm_users)
+ ln->nsm_clnt = NULL;
+ shutdown = !ln->nsm_users;
+ }
+ spin_unlock(&ln->nsm_clnt_lock);
+
+ if (shutdown)
+ rpc_shutdown_client(clnt);
+}
+