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>

8 files changed, 75 insertions, 41 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index e147f42d643d..bb18c4d69aba 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1403,11 +1403,13 @@ enum tcp_seq_states {
         TCP_SEQ_STATE_TIME_WAIT,
 };
 
+int tcp_seq_open(struct inode *inode, struct file *file);
+
 struct tcp_seq_afinfo {
-        char                    *name;
-        sa_family_t             family;
-        struct file_operations  seq_fops;
-        struct seq_operations   seq_ops;
+        char                            *name;
+        sa_family_t                     family;
+        const struct file_operations    *seq_fops;
+        struct seq_operations           seq_ops;
 };
 
 struct tcp_iter_state {
diff --git a/include/net/udp.h b/include/net/udp.h
index 67ea6fcb3ec0..3b285f402f48 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -230,12 +230,14 @@ extern struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *sadd
 #endif
 
 /* /proc */
+int udp_seq_open(struct inode *inode, struct file *file);
+
 struct udp_seq_afinfo {
-        char                    *name;
-        sa_family_t             family;
-        struct udp_table        *udp_table;
-        struct file_operations  seq_fops;
-        struct seq_operations   seq_ops;
+        char                            *name;
+        sa_family_t                     family;
+        struct udp_table                *udp_table;
+        const struct file_operations    *seq_fops;
+        struct seq_operations           seq_ops;
 };
 
 struct udp_iter_state {
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 0ea10eefa60f..939c55eceb5b 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 ebaa96bd3464..131d8a720086 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 aee9963f7f5a..08383eb54208 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,
         },
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 10b2b3165a1a..36131d122a6f 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2161,12 +2161,18 @@ out:
         return 0;
 }
 
+static const struct file_operations tcp6_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 tcp6_seq_afinfo = {
         .name           = "tcp6",
         .family         = AF_INET6,
-        .seq_fops       = {
-                .owner          = THIS_MODULE,
-        },
+        .seq_fops       = &tcp6_afinfo_seq_fops,
         .seq_ops        = {
                 .show           = tcp6_seq_show,
         },
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index f4ca0a5b3457..846f4757eb8d 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1424,13 +1424,19 @@ int udp6_seq_show(struct seq_file *seq, void *v)
         return 0;
 }
 
+static const struct file_operations udp6_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 udp6_seq_afinfo = {
         .name           = "udp6",
         .family         = AF_INET6,
         .udp_table      = &udp_table,
-        .seq_fops       = {
-                .owner  =       THIS_MODULE,
-        },
+        .seq_fops       = &udp6_afinfo_seq_fops,
         .seq_ops        = {
                 .show           = udp6_seq_show,
         },
diff --git a/net/ipv6/udplite.c b/net/ipv6/udplite.c
index 986c4de5292e..8889aa22ed47 100644
--- a/net/ipv6/udplite.c
+++ b/net/ipv6/udplite.c
@@ -93,13 +93,20 @@ void udplitev6_exit(void)
 }
 
 #ifdef CONFIG_PROC_FS
+
+static const struct file_operations udplite6_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 udplite6_seq_afinfo = {
         .name           = "udplite6",
         .family         = AF_INET6,
         .udp_table      = &udplite_table,
-        .seq_fops       = {
-                .owner  =       THIS_MODULE,
-        },
+        .seq_fops       = &udplite6_afinfo_seq_fops,
         .seq_ops        = {
                 .show           = udp6_seq_show,
         },