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nsfs: add ioctl to get a parent namespace

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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>
This commit is contained in:
Andrey Vagin 2016-09-06 00:47:15 -07:00 • committed by Eric W. Biederman
parent 6786741dbf
commit a7306ed8d9
5 changed files with 27 additions and 0 deletions
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1
kernel/user_namespace.c
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@ -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)