nfsd: make unconf_id_hashtbl allocated per net

This hash holds nfs4_clients info, which are network namespace aware.
So let's make it allocated per network namespace.

Note: this hash can be allocated in per-net operations. But it looks
better to allocate it on nfsd state start and thus don't waste resources
if server is not running.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index afd9116..1ff781f 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -55,6 +55,7 @@
 	int reclaim_str_hashtbl_size;
 	struct list_head *conf_id_hashtbl;
 	struct rb_root conf_name_tree;
+	struct list_head *unconf_id_hashtbl;
 };
 
 extern int nfsd_net_id;