linux-kernel - Re: [PATCH] cgroup: fix dentry still in use bug when dropping css refs after umount

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Message-ID: <20120708063536.GB19021@dhcp-172-17-108-109.mtv.corp.google.com>
Date:	Sat, 7 Jul 2012 23:35:36 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	shyju pv <shyju.pv@...wei.com>,
	Sanil kumar <sanil.kumar@...wei.com>,
	Masanari Iida <standby24x7@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, viro@...iv.linux.org.uk,
	levinsasha928@...il.com
Subject: Re: [PATCH] cgroup: fix dentry still in use bug when dropping css
 refs after umount

Hello, Li.

On Wed, Jul 04, 2012 at 02:19:15PM +0800, Li Zefan wrote:
> > I think we're horridly broken for
> > root cgroup tho - and it has been broken for very long time.  I think
> > it's mostly hidden because most (all?) controllers short-circuit root
> > cgroup.  Eh, well....
> > 
> 
> Could you elaborate a bit on what's broken for root cgroup?

If someone holds css ref of a root cgroup, AFAICS nothing is
preventing the cgroup hierarchy from being unmounted and root cgroup
destroyed.

Thanks.

-- 
tejun
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