tree 3db9772ea99c931914bec7ded51f896f1d2e24ec
parent 0093ccb68f3753c0ba4d74c89d7e0f444b8d6123
author Eric W. Biederman <ebiederm@xmission.com> 1321509583 -0800
committer Eric W. Biederman <ebiederm@xmission.com> 1333842952 -0700

userns: Add an explicit reference to the parent user namespace

I am about to remove the struct user_namespace reference from struct user_struct.
So keep an explicit track of the parent user namespace.

Take advantage of this new reference and replace instances of user_ns->creator->user_ns
with user_ns->parent.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>