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

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Message-ID: <20151202165312.GB19878@mtj.duckdns.org>
Date:	Wed, 2 Dec 2015 11:53:12 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
Cc:	serge@...lyn.com, linux-kernel@...r.kernel.org,
	adityakali@...gle.com, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	lxc-devel@...ts.linuxcontainers.org, akpm@...ux-foundation.org,
	ebiederm@...ssion.com
Subject: Re: [PATCH 7/8] cgroup: mount cgroupns-root when inside non-init
 cgroupns

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?

Thanks.

-- 
tejun
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