netns: struct net content re-work (v2)

Recently David Miller and Herbert Xu pointed out that struct net becomes overbloated and un-maintainable. There are two solutions:
- provide a pointer to a network subsystem definition from struct net. This costs an additional dereferrence
- place sub-system definition into the structure itself. This will speedup run-time access at the cost of recompilation time

The second approach looks better for us. Other sub-systems will be converted to this approach if this will be accepted :)

Changes from v1:
- renamed fields according to Daniel Lezcano suggestion

Signed-off-by Denis V. Lunev <[email protected]>

---
 include/net/net_namespace.h |    5 +++--
 net/unix/af_unix.c          |    4 ++--
 net/unix/sysctl_net_unix.c  |   12 ++++++------
 3 files changed, 11 insertions(+), 10 deletions(-)

include/net/net_namespace.h +2 -0

@@ -8,6 +8,8 @@
 #include <linux/workqueue.h>
 #include <linux/list.h>
 
+#include <net/netns/unix.h>
+
 struct proc_dir_entry;
 struct net_device;
 struct sock;

include/net/net_namespace.h +0 -0

 #ifdef CONFIG_NET

net/unix/af_unix.c +2 -2

@@ -592,7 +592,7 @@ static struct sock * unix_create1(struct net *net, struct socket *sock)
 				&af_unix_sk_receive_queue_lock_key);
 
 	sk->sk_write_space	= unix_write_space;
-	sk->sk_max_ack_backlog	= net->sysctl_unix_max_dgram_qlen;
+	sk->sk_max_ack_backlog	= net->unx.sysctl_max_dgram_qlen;
 	sk->sk_destruct		= unix_sock_destructor;
 	u	  = unix_sk(sk);
 	u->dentry = NULL;

@@ -2138,7 +2138,7 @@ static int unix_net_init(struct net *net)
 {
 	int error = -ENOMEM;
 
-	net->sysctl_unix_max_dgram_qlen = 10;
+	net->unx.sysctl_max_dgram_qlen = 10;
 	if (unix_sysctl_register(net))
 		goto out;
 

net/unix/sysctl_net_unix.c +6 -6

@@ -18,7 +18,7 @@ static ctl_table unix_table[] = {
 	{
 		.ctl_name	= NET_UNIX_MAX_DGRAM_QLEN,
 		.procname	= "max_dgram_qlen",
-		.data		= &init_net.sysctl_unix_max_dgram_qlen,
+		.data		= &init_net.unx.sysctl_max_dgram_qlen,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec

@@ -40,9 +40,9 @@ int unix_sysctl_register(struct net *net)
 	if (table == NULL)
 		goto err_alloc;
 
-	table[0].data = &net->sysctl_unix_max_dgram_qlen;
-	net->unix_ctl = register_net_sysctl_table(net, unix_path, table);
-	if (net->unix_ctl == NULL)
+	table[0].data = &net->unx.sysctl_max_dgram_qlen;
+	net->unx.ctl = register_net_sysctl_table(net, unix_path, table);
+	if (net->unx.ctl == NULL)
 		goto err_reg;
 
 	return 0;

@@ -57,8 +57,8 @@ void unix_sysctl_unregister(struct net *net)
 {
 	struct ctl_table *table;
 
-	table = net->unix_ctl->ctl_table_arg;
-	unregister_sysctl_table(net->unix_ctl);
+	table = net->unx.ctl->ctl_table_arg;
+	unregister_sysctl_table(net->unx.ctl);
 	kfree(table);
 }
 

Changes from v1:
- renamed fields according to Daniel Lezcano suggestion