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Message-ID: <4A66DA2E.90601@redhat.com>
Date: Wed, 22 Jul 2009 17:21:50 +0800
From: Amerigo Wang <amwang@...hat.com>
To: Miklos Szeredi <mszeredi@...e.cz>
CC: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, heiko.carstens@...ibm.com,
linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [Patch] pipe: use file_update_time() when hold i_mutex
Miklos Szeredi wrote:
> On Tue, 2009-07-21 at 18:07 +0800, Amerigo Wang wrote:
>
>> Andrew Morton wrote:
>>
>>> On Mon, 6 Jul 2009 01:35:30 -0400
>>> Amerigo Wang <amwang@...hat.com> wrote:
>>>
>>>
>>>
>>>> file_update_time() should be called with i_mutex held,
>>>> move it before mutex_unlock().
>>>>
>>>>
>>>>
>>> Why do you believe that file_update_time() needs i_mutex?
>>>
>>>
>> file_update_time() modifies inode, no? :)
>>
>
> So does touch_atime(), yet neither needs i_mutex.
>
Yes?
Then how the inode is protected when file_update_time() modifies
it?
Thanks.
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