linux-ext4 - Re: [PATCH 5 2/4] Return 32/64-bit dir name hash according to usage type

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Message-ID: <4F981458.1010708@itwm.fraunhofer.de>
Date:	Wed, 25 Apr 2012 17:12:24 +0200
From:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	Andreas Dilger <adilger@...mcloud.com>, linux-ext4@...r.kernel.org,
	Fan Yong <yong.fan@...mcloud.com>, bfields@...hat.com
Subject: Re: [PATCH 5 2/4] Return 32/64-bit dir name hash according to usage
 type

On 04/25/2012 05:05 PM, Eric Sandeen wrote:
> On 4/24/12 5:24 PM, Andreas Dilger wrote:
>> On 2012-04-24, at 4:07 PM, Bernd Schubert wrote:
>>>> 1) For SEEK_END, we now return -EINVAL for a positive offset (i.e. past EOF)
>>>
>>> I definitely introduces that one, as I cannot see how an application
>>> might ever run into it. Especially as ext4 directories cannot shrink. So
>>> if an application tries to exceed the directory size limit, it looks to
>>> me as some of attempt to break something or as an error in the
>>> application. However, if there should be the slightest chance to break
>>> existing applications relying on that, we need to remove that.
>>
>> I think the other reason to avoid SEEK_END + n is that since SEEK_END
>> for a hash offset is (signed) MAX_LONG, so if one seeks beyond that
>> it will wrap to a negative offset.
>
> Makes sense.
>
> Wishing this had been done as a separate patch, though, since it's really addressing a separate issue from the $SUBJECT, and could have used specific documentation of the change.  Nitpicky I know, but it helps.

Sorry, my fault. Maybe we should simply document it in the code?
And how do we proceed in general. Shall I write a patch to use 
generic_file_llseek() and update that function to take more arguments? I 
don't think that would go into 3.4.

Thanks,
Bernd
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