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

[Tejun Heo]

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