Re: [V2 PATCH] tmpfs: add fallocate support

[Cong Wang]

ä 2011å11æ21æ 18:06, Christoph Hellwig åé:
> 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.

I will fix the changelog.

Thanks, Christoph and Kay.
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