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

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Date:	Mon, 18 Dec 2006 16:04:45 -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 Tue, 19 Dec 2006, Andrei Popa wrote:
> > 
> > There's exactly two call sites that call "page_mkclean()" (an dthat is the 
> > only thing in turn that calls "page_mkclean_one()", which we already 
> > determined will cause the corruption). 
> >
> > Can you just TOTALLY DISABLE that case for the test_clear_page_dirty() 
> > case? Just do an "#if 0 .. #endif" around that whole if-statement, leaving 
> > the _only_ thing that actually calls "page_mkclean()" to be the 
> > "clear_page_dirty_for_io()" call.
> > 
> > Do you still see corruption?
> 
> nope, no file corruption at all.

Ok. That's interesting, but I think you actually #ifdef'ed out too 
much:

> +
> +#if 0
>  	if (TestClearPageDirty(page)) {
>  		radix_tree_tag_clear(&mapping->page_tree,
>  				page_index(page), PAGECACHE_TAG_DIRTY);
> @@ -866,11 +868,19 @@ int test_clear_page_dirty(struct page *p
>  		 * page is locked, which pins the address_space
>  		 */
>  		if (mapping_cap_account_dirty(mapping)) {
> -			page_mkclean(page);
> +			int cleaned = page_mkclean(page);
> +			if (!must_clean_ptes && cleaned){
> +			WARN_ON(1);
> +			set_page_dirty(page);
> +			}
> +
>  			dec_zone_page_state(page, NR_FILE_DIRTY);
>  		}
>  		return 1;
>  	}
> +
> +#endif
> +

It was really just the _inner_ "if (mapping_cap_account_dirty(.." 
statement that I meant you should remove.

Can you try that too?

		Linus
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