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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 <[email protected]>
Signed-off-by: Andrei Vagin <[email protected]>
Signed-off-by: Eric W. Biederman <[email protected]>
This commit is contained in:
Andrey Vagin 2016-09-06 00:47:15 -07:00 • committed by Eric W. Biederman
commit a7306ed8d9
5 changed files with 27 additions and 0 deletions
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4
fs/nsfs.c
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@ -171,6 +171,10 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl,
switch (ioctl) {
case NS_GET_USERNS:
return open_related_ns(ns, ns_get_owner);
case NS_GET_PARENT:
if (!ns->ops->get_parent)
return -EINVAL;
return open_related_ns(ns, ns->ops->get_parent);
default:
return -ENOTTY;
}