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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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include/linux/proc_ns.h
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@ -19,6 +19,7 @@ struct proc_ns_operations {
void (*put)(struct ns_common *ns);
int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
struct user_namespace *(*owner)(struct ns_common *ns);
struct ns_common *(*get_parent)(struct ns_common *ns);
};
extern const struct proc_ns_operations netns_operations;