[NET]: Add a network namespace tag to struct net_device

Please note that network devices do not increase the count
count on the network namespace.  The are inside the network
namespace and so the network namespace tag is in the nature
of a back pointer and so getting and putting the network namespace
is unnecessary.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 8f00bdf95ef4360807eed2c30ecd580c499e69d1..dc3c15b726bcafe5d0fbe0a3a0944c2ba661df6e 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -41,6 +41,7 @@
 #include <linux/dmaengine.h>
 #include <linux/workqueue.h>
 
+struct net;
 struct vlan_group;
 struct ethtool_ops;
 struct netpoll_info;
@@ -663,6 +664,9 @@ struct net_device
        void                    (*poll_controller)(struct net_device *dev);
 #endif
 
+       /* Network namespace this network device is inside */
+       struct net              *nd_net;
+
        /* bridge stuff */
        struct net_bridge_port  *br_port;
        /* macvlan */