linux-kernel - Re: [PATCH v3] sysfs: fix namespace refcnt leak

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Date:	Wed, 26 Feb 2014 09:12:27 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH v3] sysfs: fix namespace refcnt leak

On 2014/2/25 23:17, Tejun Heo wrote:
> On Tue, Feb 25, 2014 at 07:19:55AM -0800, Greg Kroah-Hartman wrote:
>> On Tue, Feb 25, 2014 at 09:42:56AM -0500, Tejun Heo wrote:
>>> On Tue, Feb 25, 2014 at 07:28:44PM +0800, Li Zefan wrote:
>>>> As mount() and kill_sb() is not a one-to-one match, we shoudn't get
>>>> ns refcnt unconditionally in sysfs_mount(), and instead we should
>>>> get the refcnt only when kernfs_mount() allocated a new superblock.
>>>>
>>>> v2:
>>>> - Changed the name of the new argument, suggested by Tejun.
>>>> - Made the argument optional, suggested by Tejun.
>>>>
>>>> v3:
>>>> - Make the new argument as second-to-last arg, suggested by Tejun.
>>>>
>>>> Reviewed-by: Tejun Heo <tj@...nel.org>
>>>> Signed-off-by: Li Zefan <lizefan@...wei.com>
>>>
>>>  Acked-by: Tejun Heo <tj@...nel.org>
>>
>> Is this needed for 3.14-final or 3.15?
> 
> It also fixes sysfs refcnting, so should also be applied to 3.14, I
> think.
> 

Actually it fixes sysfs refcnting only, but the change to kernfs is
necessary for fixing cgroupfs.

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