Re: [V2 PATCH] tmpfs: add fallocate support

[Christoph Hellwig]

On Sat, Nov 19, 2011 at 03:14:48PM +0100, Kay Sievers wrote:
> On Sat, Nov 19, 2011 at 11:03, Christoph Hellwig <hch@xxxxxxxxxxxxx> 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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