Re: [PATCH 7/8] cgroup: mount cgroupns-root when inside non-init cgroupns

Hey, Serge.

On Mon, Nov 30, 2015 at 10:07:04PM -0600, Serge E. Hallyn wrote:

So actually the way the code is now, the first mount cannot
be done from a non-init user namespace; and kernfs_obtain_root()
is only called from non-init user namespace.  So can we assume
that the root dentry will be instantiated?  (or can it get
evicted?)

If we can assume that then most of that fn can go away.

The v2 hierarchy is always mounted and non-init ns shouldn't be able
to create new v1 hierarchies, so the root dentry should always be
there.

Thanks.

-- 
tejun