mib: add netns/mib.h file

The only structure declared within is the netns_mib, which will
carry all our mibs within. I didn't put the mibs in the existing
netns_xxx structures to make it possible to mark this one as
properly aligned and get in a separate "read-mostly" cache-line.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/net_namespace.h

@@ -9,6 +9,7 @@
 #include <linux/list.h>
 
 #include <net/netns/core.h>
+#include <net/netns/mib.h>
 #include <net/netns/unix.h>
 #include <net/netns/packet.h>
 #include <net/netns/ipv4.h>
@@ -52,6 +53,7 @@ struct net {
 	struct sock 		*rtnl;			/* rtnetlink socket */
 
 	struct netns_core	core;
+	struct netns_mib	mib;
 	struct netns_packet	packet;
 	struct netns_unix	unx;
 	struct netns_ipv4	ipv4;

include/net/netns/mib.h

+#ifndef __NETNS_MIB_H__
+#define __NETNS_MIB_H__
+
+#include <net/snmp.h>
+
+struct netns_mib {
+};
+
+#endif