SUNRPC: unregister service on creation in current network namespace

On service shutdown we can be sure, that no more users of it left except
current. Thus it looks like using current network namespace context is safe in
this case.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfsd/nfssvc.c

@@ -251,13 +251,13 @@ static void nfsd_shutdown(void)
 	nfsd_up = false;
 }
 
-static void nfsd_last_thread(struct svc_serv *serv)
+static void nfsd_last_thread(struct svc_serv *serv, struct net *net)
 {
 	/* When last nfsd thread exits we need to do some clean-up */
 	nfsd_serv = NULL;
 	nfsd_shutdown();
 
-	svc_rpcb_cleanup(serv);
+	svc_rpcb_cleanup(serv, net);
 
 	printk(KERN_WARNING "nfsd: last server has exited, flushing export "
 			    "cache\n");

include/linux/sunrpc/svc.h

@@ -84,7 +84,8 @@ struct svc_serv {
 	unsigned int		sv_nrpools;	/* number of thread pools */
 	struct svc_pool *	sv_pools;	/* array of thread pools */
 
-	void			(*sv_shutdown)(struct svc_serv *serv);
+	void			(*sv_shutdown)(struct svc_serv *serv,
+					       struct net *net);
 						/* Callback to use when last thread
 						 * exits.
 						 */
@@ -413,14 +414,14 @@ struct svc_procedure {
 /*
  * Function prototypes.
  */
-void svc_rpcb_cleanup(struct svc_serv *serv);
+void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
 struct svc_serv *svc_create(struct svc_program *, unsigned int,
-			    void (*shutdown)(struct svc_serv *));
+			    void (*shutdown)(struct svc_serv *, struct net *net));
 struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
 					struct svc_pool *pool, int node);
 void		   svc_exit_thread(struct svc_rqst *);
 struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
-			void (*shutdown)(struct svc_serv *),
+			void (*shutdown)(struct svc_serv *, struct net *net),
 			svc_thread_fn, struct module *);
 int		   svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
 int		   svc_pool_stats_open(struct svc_serv *serv, struct file *file);

net/sunrpc/svc.c

@@ -382,10 +382,10 @@ static int svc_rpcb_setup(struct svc_serv *serv, struct net *net)
 	return 0;
 }
 
-void svc_rpcb_cleanup(struct svc_serv *serv)
+void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net)
 {
-	svc_unregister(serv, &init_net);
-	rpcb_put_local(&init_net);
+	svc_unregister(serv, net);
+	rpcb_put_local(net);
 }
 EXPORT_SYMBOL_GPL(svc_rpcb_cleanup);
 
@@ -411,7 +411,7 @@ static int svc_uses_rpcbind(struct svc_serv *serv)
  */
 static struct svc_serv *
 __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
-	     void (*shutdown)(struct svc_serv *serv))
+	     void (*shutdown)(struct svc_serv *serv, struct net *net))
 {
 	struct svc_serv	*serv;
 	unsigned int vers;
@@ -485,7 +485,7 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
 
 struct svc_serv *
 svc_create(struct svc_program *prog, unsigned int bufsize,
-	   void (*shutdown)(struct svc_serv *serv))
+	   void (*shutdown)(struct svc_serv *serv, struct net *net))
 {
 	return __svc_create(prog, bufsize, /*npools*/1, shutdown);
 }
@@ -493,7 +493,7 @@ EXPORT_SYMBOL_GPL(svc_create);
 
 struct svc_serv *
 svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
-		  void (*shutdown)(struct svc_serv *serv),
+		  void (*shutdown)(struct svc_serv *serv, struct net *net),
 		  svc_thread_fn func, struct module *mod)
 {
 	struct svc_serv *serv;
@@ -542,7 +542,7 @@ svc_destroy(struct svc_serv *serv)
 	svc_close_all(serv);
 
 	if (serv->sv_shutdown)
-		serv->sv_shutdown(serv);
+		serv->sv_shutdown(serv, current->nsproxy->net_ns);
 
 	cache_clean_deferred(serv);