linux-kernel - Re: Metadata in sys_sync_file

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Date:	Wed, 5 Nov 2008 17:27:08 -0800
From:	Chad Talbott <ctalbott@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, mrubin@...gle.com
Subject: Re: Metadata in sys_sync_file_range and fadvise(DONTNEED)

On Wed, Nov 5, 2008 at 5:07 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Wed, 5 Nov 2008 16:56:54 -0800
> Chad Talbott <ctalbott@...gle.com> wrote:
>> So in the new world, an application should call sync_file_range
>> (solving my problem by including metadata) to initiate writeout, and
>> then call posix_fadvise(DONTNEED) to drop the pages from page cache?
>> I think this would work for me.
>
> That would work.
>
> Although Nick is threatening to make
> sync_file_range(SYNC_FILE_RANGE_WRITE) all slow by using WB_SYNC_ALL,
> probably unnecessarily, ho hum.

Boo!  That will drive users (me at least) running back to
posix_fadvise(DONTNEED) for the non-blocking-writeback-inducing side
effect.

Chad
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