GNU bug report logs - #9500
cp: use posix_fallocate where supported

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From: Goswin von Brederlow <goswin-v-b <at> web.de>
To: Padraig Brady <P <at> draigBrady.com>
Cc: 9500 <at> debbugs.gnu.org, Kelly Anderson <kelly <at> silka.with-linux.com>, Goswin von Brederlow <goswin-v-b <at> web.de>
Subject: bug#9500: [PATCH]: use posix_fallocate where supported
Date: Sat, 26 Nov 2011 04:48:36 +0100

Pádraig Brady <P <at> draigBrady.com> writes:

> Hmm, one of your points above got me thinking.
> Might fallocate() fail to allocate an extent with ENOSPC,
> but there could be fragmented space available to write()?
> That would scupper benefit (2) above :(
> I'll ask linux-fsdevel <at> vger.kernel.org
>
> cheers,
> Pádraig.

fallocate() in no way garanties that the space is continious. Any
filesystem that is halfway smart will use a continious chunk if
possible. But it should only fail if there is really no space, no matter
how fragmented, left.

MfG
        Goswin

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