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

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Date:	Tue, 22 Nov 2011 13:39:51 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Kay Sievers <kay.sievers@...y.org>, 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

于 2011年11月21日 18:06, Christoph Hellwig 写道:
> 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.
>

I will fix the changelog.

Thanks, Christoph and Kay.
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