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

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Message-ID: <20151201164649.GD12922@mtj.duckdns.org>
Date:	Tue, 1 Dec 2015 11:46:49 -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

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
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