linux-kernel - Re: [RFC/RFT PATCH] cgroup: enable write permission for the group of users

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Date:	Wed, 02 Feb 2011 12:13:03 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Paul Menage <menage@...gle.com>,
	Jordi Pujol <jordipujolp@...il.com>,
	linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>
Subject: Re: [RFC/RFT PATCH] cgroup: enable write permission for the group
 of users

On Wed, 2011-02-02 at 02:27 +0100, Ingo Molnar wrote:
> * Paul Menage <menage@...gle.com> wrote:
> 
> > On Tue, Feb 1, 2011 at 1:02 AM, Jordi Pujol <jordipujolp@...il.com> wrote:
> > > Hello,
> > >
> > > Working in a development that uses control groups and libcgroup, I have found
> > > that the files in control groups directories need write permission for the
> > > group of users also.
> > 
> > This can be configured from userspace - chmod() works just fine on
> > control files in cgroupfs.
> 
> Sure, many things can be worked around in user-space, but the question is, does the 
> +g make sense as default cgroupfs permissions?

I don't think this is anything the kernel can guess, the cgroup
filesystem is root only on initial mount time for a good reason.
Anything thereafter is purely up to userspace.
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