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

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Message-ID: <532480950907311103s422a70acx25c0ab9c56d1ae31@mail.gmail.com>
Date:	Fri, 31 Jul 2009 11:03:07 -0700
From:	Michael Rubin <mrubin@...gle.com>
To:	Mingming <cmm@...ibm.com>
Cc:	Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>,
	Curt Wohlgemuth <curtw@...gle.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH RFC] Insure direct IO writes do not use the page cache

On Fri, Jul 31, 2009 at 10:58 AM, Mingming<cmm@...ibm.com> wrote:
> Eric and I looked at xfs code together the other day, xfs code did not
> ensure DIO sync metadata (conversion) before return back to userspace.
> It does ensure the workqueue kickoff the conversion and journal commit,
> but it seems not waiting for it to complete. This seems confirmed by xfs
> expert on IRC, who expressed DIO means only bypass page cache, but not
> necessarily means sync on data and metadata unless file is opened with
> SYNC mode.

This will our expectations for DIO on ext4 also.

mrubin
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