diff options
| author | Andrey Vagin <avagin@openvz.org> | 2016-09-06 09:47:15 +0200 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2016-09-23 02:59:41 +0200 |
| commit | a7306ed8d94af729ecef8b6e37506a1c6fc14788 (patch) | |
| tree | 0d45320911d2a339bc0abd6bacd5703c7308c08c /fs/nsfs.c | |
| parent | nsfs: add ioctl to get an owning user namespace for ns file descriptor (diff) | |
| download | linux-a7306ed8d94af729ecef8b6e37506a1c6fc14788.tar.xz linux-a7306ed8d94af729ecef8b6e37506a1c6fc14788.zip | |
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>
Diffstat (limited to 'fs/nsfs.c')
| -rw-r--r-- | fs/nsfs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nsfs.c b/fs/nsfs.c index 3887da470f7e..fb7b397a1297 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -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; } |