[TCP]: Move seq_ops from tcp_iter_state to tcp_seq_afinfo.

No need to create seq_operations for each instance of 'netstat'.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -1328,8 +1328,8 @@ struct tcp_seq_afinfo {
 	struct module		*owner;
 	char			*name;
 	sa_family_t		family;
-	int			(*seq_show) (struct seq_file *m, void *v);
 	struct file_operations	*seq_fops;
+	struct seq_operations	seq_ops;
 };
 
 struct tcp_iter_state {
@@ -1338,7 +1338,6 @@ struct tcp_iter_state {
 	enum tcp_seq_states	state;
 	struct sock		*syn_wait_sk;
 	int			bucket, sbucket, num, uid;
-	struct seq_operations	seq_ops;
 };
 
 extern int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo);

net/ipv4/tcp_ipv4.c

@@ -2229,13 +2229,9 @@ static int tcp_seq_open(struct inode *inode, struct file *file)
 		goto out_kfree;
 
 	s->family		= afinfo->family;
-	s->seq_ops.start	= tcp_seq_start;
-	s->seq_ops.next		= tcp_seq_next;
-	s->seq_ops.show		= afinfo->seq_show;
-	s->seq_ops.stop		= tcp_seq_stop;
 	s->p.net                = net;
 
-	rc = seq_open(file, &s->seq_ops);
+	rc = seq_open(file, &afinfo->seq_ops);
 	if (rc)
 		goto out_put_net;
 	seq = file->private_data;
@@ -2269,6 +2265,10 @@ int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo)
 	afinfo->seq_fops->llseek	= seq_lseek;
 	afinfo->seq_fops->release	= tcp_seq_release;
 
+	afinfo->seq_ops.start		= tcp_seq_start;
+	afinfo->seq_ops.next		= tcp_seq_next;
+	afinfo->seq_ops.stop		= tcp_seq_stop;
+
 	p = proc_net_fops_create(net, afinfo->name, S_IRUGO, afinfo->seq_fops);
 	if (p)
 		p->data = afinfo;
@@ -2414,8 +2414,10 @@ static struct tcp_seq_afinfo tcp4_seq_afinfo = {
 	.owner		= THIS_MODULE,
 	.name		= "tcp",
 	.family		= AF_INET,
-	.seq_show	= tcp4_seq_show,
 	.seq_fops	= &tcp4_seq_fops,
+	.seq_ops	= {
+		.show		= tcp4_seq_show,
+	},
 };
 
 static int tcp4_proc_init_net(struct net *net)

net/ipv6/tcp_ipv6.c

@@ -2125,8 +2125,10 @@ static struct tcp_seq_afinfo tcp6_seq_afinfo = {
 	.owner		= THIS_MODULE,
 	.name		= "tcp6",
 	.family		= AF_INET6,
-	.seq_show	= tcp6_seq_show,
 	.seq_fops	= &tcp6_seq_fops,
+	.seq_ops	= {
+		.show		= tcp6_seq_show,
+	},
 };
 
 int tcp6_proc_init(struct net *net)