linux-kernel - Re: [V2 PATCH] tmpfs: add fallocate support

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Date:	Mon, 21 Nov 2011 05:06:22 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Cong Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Pekka Enberg <penberg@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Lennart Poettering <lennart@...ttering.net>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: [V2 PATCH] tmpfs: add fallocate support

On Sat, Nov 19, 2011 at 03:14:48PM +0100, Kay Sievers wrote:
> On Sat, Nov 19, 2011 at 11:03, Christoph Hellwig <hch@...radead.org> wrote:
> > On Fri, Nov 18, 2011 at 06:39:50PM +0800, Cong Wang wrote:
> >> It seems that systemd needs tmpfs to support fallocate,
> >> see http://lkml.org/lkml/2011/10/20/275. This patch adds
> >> fallocate support to tmpfs.
> >
> > What for exactly? ??Please explain why preallocating on tmpfs would
> > make any sense.
> 
> To be able to safely use mmap(), regarding SIGBUS, on files on the
> /dev/shm filesystem. The glibc fallback loop for -ENOSYS on fallocate
> is just ugly.

That is the kind of information which needs to be in the changelog.

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