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SubjectRe: [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@infradead.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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