linux-kernel - Re: [PATCH RESEND] cgroup: remove subsystem files when remounting cgroup

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Message-ID: <20121203163423.GC19802@htj.dyndns.org>
Date:	Mon, 3 Dec 2012 08:34:23 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, lizefan@...wei.com
Subject: Re: [PATCH RESEND] cgroup: remove subsystem files when remounting
 cgroup

On Mon, Dec 03, 2012 at 09:28:18AM +0800, Gao feng wrote:
> cgroup_clear_directroy is called by cgroup_d_remove_dir
> and cgroup_remount.
> 
> when we call cgroup_remount to remount the cgroup,the subsystem
> may be unlinked from cgroupfs_root->subsys_list in rebind_subsystem,this
> subsystem's files will not be removed in cgroup_clear_directroy.
> And the system will panic when we try to access these files.
> 
> this patch removes subsystems's files before rebind_subsystems,
> if rebind_subsystems failed, repopulate these removed files.
> 
> With help from Tejun.
> 
> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>

Applied to cgroup/for-3.8 with spaces added after commas.

Thanks!

-- 
tejun
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