net: make the tcp and udp file_operations for the /proc stuff const

the tcp and udp code creates a set of struct file_operations at runtime
while it can also be done at compile time, with the added benefit of then
having these file operations be const.

the trickiest part was to get the "THIS_MODULE" reference right; the naive
method of declaring a struct in the place of registration would not work
for this reason.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 34 insertions, 23 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 0ea10ee..939c55e 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2339,7 +2339,7 @@ static void tcp_seq_stop(struct seq_file *seq, void *v)
 	}
 }
 
-static int tcp_seq_open(struct inode *inode, struct file *file)
+int tcp_seq_open(struct inode *inode, struct file *file)
 {
 	struct tcp_seq_afinfo *afinfo = PDE(inode)->data;
 	struct tcp_iter_state *s;
@@ -2355,23 +2355,19 @@ static int tcp_seq_open(struct inode *inode, struct file *file)
 	s->last_pos 		= 0;
 	return 0;
 }
+EXPORT_SYMBOL(tcp_seq_open);
 
 int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo)
 {
 	int rc = 0;
 	struct proc_dir_entry *p;
 
-	afinfo->seq_fops.open		= tcp_seq_open;
-	afinfo->seq_fops.read		= seq_read;
-	afinfo->seq_fops.llseek		= seq_lseek;
-	afinfo->seq_fops.release	= seq_release_net;
-
 	afinfo->seq_ops.start		= tcp_seq_start;
 	afinfo->seq_ops.next		= tcp_seq_next;
 	afinfo->seq_ops.stop		= tcp_seq_stop;
 
 	p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
-			     &afinfo->seq_fops, afinfo);
+			     afinfo->seq_fops, afinfo);
 	if (!p)
 		rc = -ENOMEM;
 	return rc;
@@ -2520,12 +2516,18 @@ out:
 	return 0;
 }
 
+static const struct file_operations tcp_afinfo_seq_fops = {
+	.owner   = THIS_MODULE,
+	.open    = tcp_seq_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release_net
+};
+
 static struct tcp_seq_afinfo tcp4_seq_afinfo = {
 	.name		= "tcp",
 	.family		= AF_INET,
-	.seq_fops	= {
-		.owner		= THIS_MODULE,
-	},
+	.seq_fops	= &tcp_afinfo_seq_fops,
 	.seq_ops	= {
 		.show		= tcp4_seq_show,
 	},
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ebaa96b..131d8a7 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2037,7 +2037,7 @@ static void udp_seq_stop(struct seq_file *seq, void *v)
 		spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
 }
 
-static int udp_seq_open(struct inode *inode, struct file *file)
+int udp_seq_open(struct inode *inode, struct file *file)
 {
 	struct udp_seq_afinfo *afinfo = PDE(inode)->data;
 	struct udp_iter_state *s;
@@ -2053,6 +2053,7 @@ static int udp_seq_open(struct inode *inode, struct file *file)
 	s->udp_table		= afinfo->udp_table;
 	return err;
 }
+EXPORT_SYMBOL(udp_seq_open);
 
 /* ------------------------------------------------------------------------ */
 int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo)
@@ -2060,17 +2061,12 @@ int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo)
 	struct proc_dir_entry *p;
 	int rc = 0;
 
-	afinfo->seq_fops.open		= udp_seq_open;
-	afinfo->seq_fops.read		= seq_read;
-	afinfo->seq_fops.llseek		= seq_lseek;
-	afinfo->seq_fops.release	= seq_release_net;
-
 	afinfo->seq_ops.start		= udp_seq_start;
 	afinfo->seq_ops.next		= udp_seq_next;
 	afinfo->seq_ops.stop		= udp_seq_stop;
 
 	p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
-			     &afinfo->seq_fops, afinfo);
+			     afinfo->seq_fops, afinfo);
 	if (!p)
 		rc = -ENOMEM;
 	return rc;
@@ -2120,14 +2116,20 @@ int udp4_seq_show(struct seq_file *seq, void *v)
 	return 0;
 }
 
+static const struct file_operations udp_afinfo_seq_fops = {
+	.owner    = THIS_MODULE,
+	.open     = udp_seq_open,
+	.read     = seq_read,
+	.llseek   = seq_lseek,
+	.release  = seq_release_net
+};
+
 /* ------------------------------------------------------------------------ */
 static struct udp_seq_afinfo udp4_seq_afinfo = {
 	.name		= "udp",
 	.family		= AF_INET,
 	.udp_table	= &udp_table,
-	.seq_fops	= {
-		.owner	=	THIS_MODULE,
-	},
+	.seq_fops	= &udp_afinfo_seq_fops,
 	.seq_ops	= {
 		.show		= udp4_seq_show,
 	},
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
index aee9963..08383eb 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite.c
@@ -71,13 +71,20 @@ static struct inet_protosw udplite4_protosw = {
 };
 
 #ifdef CONFIG_PROC_FS
+
+static const struct file_operations udplite_afinfo_seq_fops = {
+	.owner    = THIS_MODULE,
+	.open     = udp_seq_open,
+	.read     = seq_read,
+	.llseek   = seq_lseek,
+	.release  = seq_release_net
+};
+
 static struct udp_seq_afinfo udplite4_seq_afinfo = {
 	.name		= "udplite",
 	.family		= AF_INET,
 	.udp_table 	= &udplite_table,
-	.seq_fops	= {
-		.owner	=	THIS_MODULE,
-	},
+	.seq_fops	= &udplite_afinfo_seq_fops,
 	.seq_ops	= {
 		.show		= udp4_seq_show,
 	},