linux-kernel - Re: [PATCH] mm: fix page_mkclean_one (was: 2.6.19 file content corruption on ext3)

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Date:	Wed, 20 Dec 2006 14:25:42 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
cc:	Martin Michlmayr <tbm@...ius.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hugh Dickins <hugh@...itas.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrei Popa <andrei.popa@...eo.ro>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Florian Weimer <fw@...eb.enyo.de>,
	Marc Haber <mh+linux-kernel@...schlus.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Arnd Bergmann <arnd.bergmann@...ibm.com>,
	gordonfarquharson@...il.com
Subject: Re: [PATCH] mm: fix page_mkclean_one (was: 2.6.19 file content
 corruption on ext3)



On Wed, 20 Dec 2006, Dave Kleikamp wrote:
> 
> This patch removes some questionable code that attempted to make a
> no-longer-used page easier to reclaim.

If so, "cancel_dirty_page()" may actually be the right thing to use, but 
only if you can guarantee that the page isn't mapped anywhere (and from 
the name of the function I guess it's not something that you'll ever map?)

So the JFS code _looks_ like you could just replace the

	clear_page_dirty(page);

with

	cancel_dirty_page(page, PAGE_CACHE_SIZE);

(where that second parameter is just used for statistics - it updates the 
"cancelled IO" byte-counts if CONFIG_TASK_IO_ACCOUNTING is set - so the 
number doesn't really matter, you could make it zero if you never want the 
thing to show up in the IO accounting).

			Linus
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