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 <den@openvz.org>
---
 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(-)

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -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;
@@ -46,8 +48,7 @@ struct net {
 	struct hlist_head	packet_sklist;
 
 	/* unix sockets */
-	int			sysctl_unix_max_dgram_qlen;
-	struct ctl_table_header	*unix_ctl;
+	struct netns_unix	unx;
 };
 
 #ifdef CONFIG_NET
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -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;
 
diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
--- a/net/unix/sysctl_net_unix.c
+++ b/net/unix/sysctl_net_unix.c
@@ -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);
 }
 
-- 
1.5.3.rc5

Denis V. Lunev wrote:
> 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 <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>

> ---
>  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(-)
> 
> diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
> --- a/include/net/net_namespace.h
> +++ b/include/net/net_namespace.h
> @@ -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;
> @@ -46,8 +48,7 @@ struct net {
>  	struct hlist_head	packet_sklist;
> 
>  	/* unix sockets */
> -	int			sysctl_unix_max_dgram_qlen;
> -	struct ctl_table_header	*unix_ctl;
> +	struct netns_unix	unx;
>  };

"unx" looks really weird for me. But anyway it is a cosmetic issue, not 
very important. Just in case you change your mind, two suggestions for 
the name :)

struct netns_unix netns_unix;
struct netns_unix af_unix;

>  #ifdef CONFIG_NET
> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> --- a/net/unix/af_unix.c
> +++ b/net/unix/af_unix.c
> @@ -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;
> 
> diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
> --- a/net/unix/sysctl_net_unix.c
> +++ b/net/unix/sysctl_net_unix.c
> @@ -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);
>  }
> 

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From: "Denis V. Lunev" <den@openvz.org>
Date: Tue, 11 Dec 2007 10:45:04 +0300

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

More changes from v1:
- Forgot to include net/netns/unix.h in the patch

Please fix this :-)