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Message-ID: <20111121100622.GA17887@infradead.org> 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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