linux-kernel - Re: [PATCH] dio: falling through to buffered I/O when invalidation of a page fails

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Date:	Fri, 14 Dec 2007 10:59:56 -0800
From:	Badari Pulavarty <pbadari@...ibm.com>
To:	Zach Brown <zach.brown@...cle.com>
Cc:	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [PATCH] dio: falling through to buffered I/O when invalidation
	of a page fails

On Tue, 2007-12-11 at 17:00 -0800, Zach Brown wrote:
> Hisashi Hifumi wrote:
> > Hi.
> > 
> > Current dio has some problems:
> > 1, In ext3 ordered, dio write can return with EIO because of the race
> > between invalidation of
> > a page and jbd. jbd pins the bhs while committing journal so
> > try_to_release_page fails when jbd
> > is committing the transaction.
> 
> Yeah.  It sure would be fantastic if some ext3 expert could stop this
> from happening somehow.  But that hasn't happened in.. uh.. Badari, for
> how many years has this been on the radar? :)

I used to have a test case that would reproduce the problem some what
consistently. But with invalidate_range() introduction and Jan Kara's
re-write of journal commit handling, I can't reproduce the problem
anymore. So I gave up fixing the problem which I can't reproduce.

If anyone has a testcase - I can take a look at the problem again.

Thanks,
Badari



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