linux-kernel - Re: [PATCH] procfs: fix numbering in /proc/locks

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Date:	Wed, 29 Sep 2010 14:00:19 +0200
From:	Jerome Marchand <jmarchan@...hat.com>
To:	Pavel Emelyanov <xemul@...allels.com>
CC:	Matthew Wilcox <matthew@....cx>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] procfs: fix numbering in /proc/locks

On 09/29/2010 01:56 PM, Pavel Emelyanov wrote:
> On 09/29/2010 03:52 PM, Jerome Marchand wrote:
>> On 09/29/2010 01:43 PM, Pavel Emelyanov wrote:
>>>> Good point. My implementation is definitely wrong. But I'm afraid that
>>>> moving the increment in locks_next() won't help either. It will fail when
>>>> a program do something more than just read the file sequentially (use
>>>> of lseek() for instance). We need a better way to keep track of the
>>>> current position in the list.
>>>
>>> The seq files core implementation knows about the lseek and
>>> calls the seq_ops callbacks properly.
>>>
>>
>> Yes, but if read a few lines and then lseek() back. I'm afraid it will call
>> a few more locks_next() function and thus increase the counter again.
> 
> No. If you lseek back it calls the locks_start which should reset the
> counter, and then will call locks_next.
> 
> Can you try out my proposal and check whether it really works as expected?
> 

OK. I didn't understand you meant to keep the reset in locks_start(). I'll
try that.

Jerome
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