[PATCH 14/23] net: Add net namespaces into ns_idr

[Kirill Tkhai]

Now they are exposed in /proc/namespace/ directory.

We already wait RCU grace period in cleanup_net()
before pernet_operations exit, so ns_idr_unregister()
works as expected.

Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 net/core/net_namespace.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 5f658cbedd34..f78655a670e5 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -701,14 +701,24 @@ EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
 
 static __net_init int net_ns_net_init(struct net *net)
 {
+       int ret;
 #ifdef CONFIG_NET_NS
        net->ns.ops = &netns_operations;
 #endif
-       return ns_alloc_inum(&net->ns);
+       ret = ns_alloc_inum(&net->ns);
+       if (ret)
+               return ret;
+
+       ret = ns_idr_register(&net->ns);
+       if (ret < 0)
+               ns_free_inum(&net->ns);
+
+       return ret;
 }
 
 static __net_exit void net_ns_net_exit(struct net *net)
 {
+       ns_idr_unregister(&net->ns);
        ns_free_inum(&net->ns);
 }