linux-ext4 - Re: [PATCH RFC] Insure direct IO writes do not use the page cache

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Date:	Wed, 29 Jul 2009 14:48:11 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Curt Wohlgemuth <curtw@...gle.com>
CC:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH RFC] Insure direct IO writes do not use the page cache

Eric Sandeen wrote:
...

> Also, IIRC xfs does the conversion to written (vs. unwritten) extents in
> an IO completion handler, just FWIW.

After talking w/ Jeff Moyer, realized that w/o using the io completion,
there's a race with AIO.

Userspace will get notified that the write is done before the extents
get flipped to initialized ....

-Eric
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