nfsd/sunrpc: add a new svc_serv_ops struct and move sv_shutdown into it

In later patches we'll need to abstract out more operations on a
per-service level, besides sv_shutdown and sv_function.

Declare a new svc_serv_ops struct to hold these operations, and move
sv_shutdown into this struct.

Signed-off-by: Shirley Ma <shirley.ma@oracle.com>
Acked-by: Jeff Layton <jlayton@primarydata.com>
Tested-by: Shirley Ma <shirley.ma@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index fae6fb9..2e682f6 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -54,6 +54,13 @@
 	unsigned long		sp_flags;
 } ____cacheline_aligned_in_smp;
 
+struct svc_serv;
+
+struct svc_serv_ops {
+	/* Callback to use when last thread exits. */
+	void	(*svo_shutdown)(struct svc_serv *serv, struct net *net);
+};
+
 /*
  * RPC service.
  *
@@ -85,13 +92,7 @@
 
 	unsigned int		sv_nrpools;	/* number of thread pools */
 	struct svc_pool *	sv_pools;	/* array of thread pools */
-
-	void			(*sv_shutdown)(struct svc_serv *serv,
-					       struct net *net);
-						/* Callback to use when last thread
-						 * exits.
-						 */
-
+	struct svc_serv_ops	*sv_ops;	/* server operations */
 	struct module *		sv_module;	/* optional module to count when
 						 * adding threads */
 	svc_thread_fn		sv_function;	/* main function for threads */
@@ -429,13 +430,12 @@
 void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
 int svc_bind(struct svc_serv *serv, struct net *net);
 struct svc_serv *svc_create(struct svc_program *, unsigned int,
-			    void (*shutdown)(struct svc_serv *, struct net *net));
+			    struct svc_serv_ops *);
 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 *, struct net *net),
-			svc_thread_fn, struct module *);
+			struct svc_serv_ops *, 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);
 void		   svc_destroy(struct svc_serv *);