[SOCK][NETNS]: Register sockstat(6) files in each net.

Currently they live in init_net only, but now almost all the info
they can provide is available per-net.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/proc.c

@@ -426,25 +426,42 @@ static const struct file_operations netstat_seq_fops = {
 	.release = single_release,
 };
 
+static __net_init int ip_proc_init_net(struct net *net)
+{
+	if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
+		return -ENOMEM;
+	return 0;
+}
+
+static __net_exit void ip_proc_exit_net(struct net *net)
+{
+	proc_net_remove(net, "sockstat");
+}
+
+static __net_initdata struct pernet_operations ip_proc_ops = {
+	.init = ip_proc_init_net,
+	.exit = ip_proc_exit_net,
+};
+
 int __init ip_misc_proc_init(void)
 {
 	int rc = 0;
 
+	if (register_pernet_subsys(&ip_proc_ops))
+		goto out_pernet;
+
 	if (!proc_net_fops_create(&init_net, "netstat", S_IRUGO, &netstat_seq_fops))
 		goto out_netstat;
 
 	if (!proc_net_fops_create(&init_net, "snmp", S_IRUGO, &snmp_seq_fops))
 		goto out_snmp;
-
-	if (!proc_net_fops_create(&init_net, "sockstat", S_IRUGO, &sockstat_seq_fops))
-		goto out_sockstat;
 out:
 	return rc;
-out_sockstat:
-	proc_net_remove(&init_net, "snmp");
 out_snmp:
 	proc_net_remove(&init_net, "netstat");
 out_netstat:
+	unregister_pernet_subsys(&ip_proc_ops);
+out_pernet:
 	rc = -ENOMEM;
 	goto out;
 }

net/ipv6/proc.c

@@ -243,27 +243,45 @@ int snmp6_unregister_dev(struct inet6_dev *idev)
 	return 0;
 }
 
+static int ipv6_proc_init_net(struct net *net)
+{
+	if (!proc_net_fops_create(net, "sockstat6", S_IRUGO,
+			&sockstat6_seq_fops))
+		return -ENOMEM;
+	return 0;
+}
+
+static void ipv6_proc_exit_net(struct net *net)
+{
+	proc_net_remove(net, "sockstat6");
+}
+
+static struct pernet_operations ipv6_proc_ops = {
+	.init = ipv6_proc_init_net,
+	.exit = ipv6_proc_exit_net,
+};
+
 int __init ipv6_misc_proc_init(void)
 {
 	int rc = 0;
 
+	if (register_pernet_subsys(&ipv6_proc_ops))
+		goto proc_net_fail;
+
 	if (!proc_net_fops_create(&init_net, "snmp6", S_IRUGO, &snmp6_seq_fops))
 		goto proc_snmp6_fail;
 
 	proc_net_devsnmp6 = proc_mkdir("dev_snmp6", init_net.proc_net);
 	if (!proc_net_devsnmp6)
 		goto proc_dev_snmp6_fail;
-
-	if (!proc_net_fops_create(&init_net, "sockstat6", S_IRUGO, &sockstat6_seq_fops))
-		goto proc_sockstat6_fail;
 out:
 	return rc;
 
-proc_sockstat6_fail:
-	proc_net_remove(&init_net, "dev_snmp6");
 proc_dev_snmp6_fail:
 	proc_net_remove(&init_net, "snmp6");
 proc_snmp6_fail:
+	unregister_pernet_subsys(&ipv6_proc_ops);
+proc_net_fail:
 	rc = -ENOMEM;
 	goto out;
 }
@@ -273,5 +291,6 @@ void ipv6_misc_proc_exit(void)
 	proc_net_remove(&init_net, "sockstat6");
 	proc_net_remove(&init_net, "dev_snmp6");
 	proc_net_remove(&init_net, "snmp6");
+	unregister_pernet_subsys(&ipv6_proc_ops);
 }