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

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Message-ID: <4F9812C7.3020300@redhat.com>
Date:	Wed, 25 Apr 2012 10:05:43 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Andreas Dilger <adilger@...mcloud.com>
CC:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>,
	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 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.

-Eric

> Cheers, Andreas
> --
> Andreas Dilger                       Whamcloud, Inc.
> Principal Lustre Engineer            http://www.whamcloud.com/
> 
> 
> 
> 

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