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From: Edward Shishkin <edward.shishkin@gmail.com>
To: Michael Raskin <7c6f434c@mail.ru>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [BUG] fallocate behavior when crossing end-of-file
Date: Wed, 06 May 2009 17:36:14 +0200	[thread overview]
Message-ID: <4A01AE6E.1050400@gmail.com> (raw)
In-Reply-To: <4A01A8C4.20205@mail.ru>

Michael Raskin wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Edward Shishkin wrote:
>   
>>> Desired: something (probably, one block) is allocated/reserved for the
>>> file. File length is set to 1 byte.
>>>       
>>              
>> Where is it documented?
>>
>> IMHO we should only guarantee that writes
>> to [0, 1] won't fail because of lack of disk space.
>> Other things (including file size) are up to implementation.
>>     
>
> POSIX, SUS.
>
> http://www.opengroup.org/onlinepubs/009695399/functions/posix_fallocate.html
>
> <<<
> If the offset+ len is beyond the current file size, then
> posix_fallocate() shall adjust the file size to offset+ len. Otherwise,
> the file size shall not be changed.
>   

fallocate (2) is something different from posix_fallocate:

"...This default behavior closely resembles the behavior
of the posix_fallocate(3) library function, and is intended
as a method of optimally implementing that function."

  reply	other threads:[~2009-05-06 15:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-06 13:03 [BUG] fallocate behavior when crossing end-of-file Raskin Michael
2009-05-06 14:59 ` Edward Shishkin
2009-05-06 15:10   ` Chris Mason
2009-05-06 15:12   ` Michael Raskin
2009-05-06 15:36     ` Edward Shishkin [this message]
2009-05-06 21:07       ` Michael Raskin

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