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

[Serge E. Hallyn]

On Wed, Dec 02, 2015 at 11:53:12AM -0500, Tejun Heo wrote:
> Hello, Serge.
> 
> On Tue, Dec 01, 2015 at 03:58:53PM -0600, Serge E. Hallyn wrote:
> > I mispoke before though - it's not the hierarchy's root dentry,
> > but rather a dentry for a descendent cgroup which will become the
> > root dentry for the new superblock.  We do know that there must be
> > a css_set with a cgroup.  I'm still trying to track down whether
> > that cgrou's inode's dentry can ever be flushed.  I would think
> > not but am not sure.
> 
> Hmmm... I'm not really following.  The inode can be flushed and that's
> why it needs to be walked down from root.  What am I missing here?

Can it be flushed when we know that the cgroup is being pinned by
a css_set?  (There's either a task or a cgroup_namespace pinning it
or we wouldn't get here)

-serge
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