linux-kernel - Re: 2.6.19 file content corruption on ext3

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Date:	Mon, 18 Dec 2006 12:41:56 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Andrei Popa <andrei.popa@...eo.ro>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hugh@...itas.com>,
	Florian Weimer <fw@...eb.enyo.de>,
	Marc Haber <mh+linux-kernel@...schlus.de>,
	Martin Michlmayr <tbm@...ius.com>
Subject: Re: 2.6.19 file content corruption on ext3

On Mon, 18 Dec 2006, Linus Torvalds wrote:
> 
> But at the same time, it's interesting that it still happens when we try 
> to re-add the dirty bit. That would tell me that it's one of two cases:

Forget that. There's a third case, which is much more likely:

 - Andrew's patch had a ", 1" where it _should_ have had a ", 0".

This should be fairly easy to test: just change every single ", 1" case in 
the patch to ", 0".

The only case that _definitely_ would want ",1" is actually the case that 
already calls page_mkclean() directly: clear_page_dirty_for_io(). So no 
other ", 1" is valid, and that one that needed it already avoided even 
calling the "test_clear_page_dirty()" function, because it did it all by 
hand.

What happens for you in that case?

		Linus
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