From a7306ed8d94af729ecef8b6e37506a1c6fc14788 Mon Sep 17 00:00:00 2001
From: Andrey Vagin <avagin@openvz.org>
Date: Tue, 6 Sep 2016 00:47:15 -0700
Subject: nsfs: add ioctl to get a parent namespace

Pid and user namepaces are hierarchical. There is no way to discover
parent-child relationships.

In a future we will use this interface to dump and restore nested
namespaces.

Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 kernel/user_namespace.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'kernel/user_namespace.c')

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 0ef683a03c20..a58a219b99c6 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -1034,6 +1034,7 @@ const struct proc_ns_operations userns_operations = {
 	.put		= userns_put,
 	.install	= userns_install,
 	.owner		= userns_owner,
+	.get_parent	= ns_get_owner,
 };
 
 static __init int user_namespaces_init(void)
-- 
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