svc: Move create logic to common code

Move the svc transport list logic into common transport creation code.
Refactor this code path to make the flow of control easier to read.

Move the setting and clearing of the BUSY_BIT during transport creation
to common code.
Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

net/sunrpc/svc_xprt.c

@@ -105,6 +105,7 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt,
 	INIT_LIST_HEAD(&xprt->xpt_deferred);
 	mutex_init(&xprt->xpt_mutex);
 	spin_lock_init(&xprt->xpt_lock);
+	set_bit(XPT_BUSY, &xprt->xpt_flags);
 }
 EXPORT_SYMBOL_GPL(svc_xprt_init);
 
@@ -112,7 +113,6 @@ int svc_create_xprt(struct svc_serv *serv, char *xprt_name, unsigned short port,
 		    int flags)
 {
 	struct svc_xprt_class *xcl;
-	int ret = -ENOENT;
 	struct sockaddr_in sin = {
 		.sin_family		= AF_INET,
 		.sin_addr.s_addr	= INADDR_ANY,
@@ -121,27 +121,34 @@ int svc_create_xprt(struct svc_serv *serv, char *xprt_name, unsigned short port,
 	dprintk("svc: creating transport %s[%d]\n", xprt_name, port);
 	spin_lock(&svc_xprt_class_lock);
 	list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
-		if (strcmp(xprt_name, xcl->xcl_name) == 0) {
-			spin_unlock(&svc_xprt_class_lock);
-			if (try_module_get(xcl->xcl_owner)) {
-				struct svc_xprt *newxprt;
-				newxprt = xcl->xcl_ops->xpo_create
-					(serv,
-					 (struct sockaddr *)&sin, sizeof(sin),
-					 flags);
-				if (IS_ERR(newxprt)) {
-					module_put(xcl->xcl_owner);
-					ret = PTR_ERR(newxprt);
-				} else
-					ret = svc_xprt_local_port(newxprt);
-			}
-			goto out;
+		struct svc_xprt *newxprt;
+
+		if (strcmp(xprt_name, xcl->xcl_name))
+			continue;
+
+		if (!try_module_get(xcl->xcl_owner))
+			goto err;
+
+		spin_unlock(&svc_xprt_class_lock);
+		newxprt = xcl->xcl_ops->
+			xpo_create(serv, (struct sockaddr *)&sin, sizeof(sin),
+				   flags);
+		if (IS_ERR(newxprt)) {
+			module_put(xcl->xcl_owner);
+			return PTR_ERR(newxprt);
 		}
+
+		clear_bit(XPT_TEMP, &newxprt->xpt_flags);
+		spin_lock_bh(&serv->sv_lock);
+		list_add(&newxprt->xpt_list, &serv->sv_permsocks);
+		spin_unlock_bh(&serv->sv_lock);
+		clear_bit(XPT_BUSY, &newxprt->xpt_flags);
+		return svc_xprt_local_port(newxprt);
 	}
+ err:
 	spin_unlock(&svc_xprt_class_lock);
 	dprintk("svc: transport %s not found\n", xprt_name);
- out:
-	return ret;
+	return -ENOENT;
 }
 EXPORT_SYMBOL_GPL(svc_create_xprt);
 

net/sunrpc/svcsock.c

@@ -94,6 +94,7 @@ static int svc_deferred_recv(struct svc_rqst *rqstp);
 static struct cache_deferred_req *svc_defer(struct cache_req *req);
 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
 					  struct sockaddr *, int, int);
+static void svc_age_temp_xprts(unsigned long closure);
 
 /* apparently the "standard" is that clients close
  * idle connections after 5 minutes, servers after
@@ -1573,6 +1574,19 @@ svc_recv(struct svc_rqst *rqstp, long timeout)
 			 */
 			__module_get(newxpt->xpt_class->xcl_owner);
 			svc_check_conn_limits(xprt->xpt_server);
+			spin_lock_bh(&serv->sv_lock);
+			set_bit(XPT_TEMP, &newxpt->xpt_flags);
+			list_add(&newxpt->xpt_list, &serv->sv_tempsocks);
+			serv->sv_tmpcnt++;
+			if (serv->sv_temptimer.function == NULL) {
+				/* setup timer to age temp sockets */
+				setup_timer(&serv->sv_temptimer,
+					    svc_age_temp_xprts,
+					    (unsigned long)serv);
+				mod_timer(&serv->sv_temptimer,
+					  jiffies + svc_conn_age_period * HZ);
+			}
+			spin_unlock_bh(&serv->sv_lock);
 			svc_xprt_received(newxpt);
 		}
 		svc_xprt_received(xprt);
@@ -1716,7 +1730,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 	struct svc_sock	*svsk;
 	struct sock	*inet;
 	int		pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
-	int		is_temporary = flags & SVC_SOCK_TEMPORARY;
 
 	dprintk("svc: svc_setup_socket %p\n", sock);
 	if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
@@ -1736,7 +1749,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 		return NULL;
 	}
 
-	set_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags);
 	inet->sk_user_data = svsk;
 	svsk->sk_sock = sock;
 	svsk->sk_sk = inet;
@@ -1750,24 +1762,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 	else
 		svc_tcp_init(svsk, serv);
 
-	spin_lock_bh(&serv->sv_lock);
-	if (is_temporary) {
-		set_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
-		list_add(&svsk->sk_xprt.xpt_list, &serv->sv_tempsocks);
-		serv->sv_tmpcnt++;
-		if (serv->sv_temptimer.function == NULL) {
-			/* setup timer to age temp sockets */
-			setup_timer(&serv->sv_temptimer, svc_age_temp_xprts,
-					(unsigned long)serv);
-			mod_timer(&serv->sv_temptimer,
-					jiffies + svc_conn_age_period * HZ);
-		}
-	} else {
-		clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
-		list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
-	}
-	spin_unlock_bh(&serv->sv_lock);
-
 	dprintk("svc: svc_setup_socket created %p (inet %p)\n",
 				svsk, svsk->sk_sk);
 
@@ -1800,6 +1794,10 @@ int svc_addsock(struct svc_serv *serv,
 			int salen;
 			if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
 				svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
+			clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
+			spin_lock_bh(&serv->sv_lock);
+			list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
+			spin_unlock_bh(&serv->sv_lock);
 			svc_xprt_received(&svsk->sk_xprt);
 			err = 0;
 		}
@@ -1865,7 +1863,6 @@ static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
 
 	if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
 		svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
-		svc_xprt_received(&svsk->sk_xprt);
 		return (struct svc_xprt *)svsk;
 	}