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

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Message #29 received at 9500 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: 9500 <at> debbugs.gnu.org
Cc: Kelly Anderson <kelly <at> silka.with-linux.com>,
	Goswin von Brederlow <goswin-v-b <at> web.de>
Subject: Re: bug#9500: [PATCH]: use posix_fallocate where supported
Date: Fri, 25 Nov 2011 10:59:09 +0000

On 11/25/2011 10:13 AM, Pádraig Brady wrote:

> 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

And the response from there is that fallocate() will
check the free blocks first, and then try to allocate
as a contiguous extent, but that part is not guaranteed.
So we still get benefit (2).

cheers,
Pádraig.

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