[NETNS]: struct net content re-work (v3)

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 follow.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 16 insertions, 3 deletions

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index b62e31fca474..d943fd4eaba5 100644
--- 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;
@@ -45,9 +47,7 @@ struct net {
         rwlock_t                packet_sklist_lock;
         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/include/net/netns/unix.h b/include/net/netns/unix.h
new file mode 100644
index 000000000000..284649d4dfb4
--- /dev/null
+++ b/include/net/netns/unix.h
@@ -0,0 +1,13 @@
+/*
+ * Unix network namespace
+ */
+#ifndef __NETNS_UNIX_H__
+#define __NETNS_UNIX_H__
+
+struct ctl_table_header;
+struct netns_unix {
+        int                     sysctl_max_dgram_qlen;
+        struct ctl_table_header *ctl;
+};
+
+#endif /* __NETNS_UNIX_H__ */