linux-kernel - Re: [PATCH] Fix bad data from non-direct-io read after direct-io write

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Message-ID: <alpine.LFD.0.999.0710261611511.30120@woody.linux-foundation.org>
Date:	Fri, 26 Oct 2007 16:14:10 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Zach Brown <zach.brown@...cle.com>
cc:	Karl Schendel <kschendel@...allegro.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Leonid Ananiev <leonid.i.ananiev@...ux.intel.com>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [PATCH] Fix bad data from non-direct-io read after direct-io
 write

On Fri, 26 Oct 2007, Zach Brown wrote:
> 
> I can throw together a patch if you haven't already committed one by the
> time you read this ;).

I'm not touching that code except to send out possible patches for others 
to test and comment on. I have no test-cases, nor any real interest in it. 
So yeah, please send me a tested and thought-through patch.

It sounded like Karl actually had a test-case to trigger this, but maybe 
I'm confused (and it sounds a bit unlikely, since it should be hard to 
trigger.. Although maybe you can trigger it by doing a direct_IO write 
with the *source* being an mmap() of the file you're writing to, and 
depending on the write itself re-populating the destination in the page 
cache?)

Karl?

		Linus
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