nfsd: make name-to-id cache allocated per network namespace context

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 948a718..3936563 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -33,7 +33,7 @@
 	struct cache_detail *svc_export_cache;
 
 	struct cache_detail *idtoname_cache;
-
+	struct cache_detail *nametoid_cache;
 };
 
 extern int nfsd_net_id;