From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id DEBBB6B006C for ; Tue, 22 Nov 2011 00:40:08 -0500 (EST) Message-ID: <4ECB35A7.9050709@redhat.com> Date: Tue, 22 Nov 2011 13:39:51 +0800 From: Cong Wang MIME-Version: 1.0 Subject: Re: [V2 PATCH] tmpfs: add fallocate support References: <1321612791-4764-1-git-send-email-amwang@redhat.com> <20111119100326.GA27967@infradead.org> <20111121100622.GA17887@infradead.org> In-Reply-To: <20111121100622.GA17887@infradead.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Hellwig Cc: Kay Sievers , linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Pekka Enberg , Hugh Dickins , Dave Hansen , Lennart Poettering , KOSAKI Motohiro , linux-mm@kvack.org ao? 2011a1'11ae??21ae?JPY 18:06, Christoph Hellwig a??e??: > On Sat, Nov 19, 2011 at 03:14:48PM +0100, Kay Sievers wrote: >> On Sat, Nov 19, 2011 at 11:03, Christoph Hellwig 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org