linux-kernel - Re: linux-next: manual merge of the cleancache tree with Linus' tree

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Date:	Wed, 23 Mar 2011 20:56:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Dan Magenheimer <dan.magenheimer@...cle.com>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Minchan Kim <minchan.kim@...il.com>,
	Linus <torvalds@...ux-foundation.org>
Subject: Re: linux-next: manual merge of the cleancache tree with Linus'
 tree

On Thu, 24 Mar 2011 13:55:24 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi Dan,
> 
> Today's linux-next merge of the cleancache tree got a conflict in
> mm/truncate.c between commit 5adc7b518b54 ("mm: truncate: change
> remove_from_page_cache") from Linus' tree and commit 03e838947c8a
> ("mm/fs: add hooks to support cleancache") from the cleancache tree.
> 
> I fixed it up (see below) but am really not sure of the fix.  I can carry
> this fix as necessary.
> 
> Is this stuff going to be merged into Linus' tree this time round?
> -- 
> Cheers,
> Stephen Rothwell                    sfr@...b.auug.org.au
> 
> diff --cc mm/truncate.c
> index a956675,cd94607..0000000
> --- a/mm/truncate.c
> +++ b/mm/truncate.c
> @@@ -106,8 -108,13 +108,12 @@@ truncate_complete_page(struct address_s
>   	cancel_dirty_page(page, PAGE_CACHE_SIZE);
>   
>   	clear_page_mlock(page);
>  -	remove_from_page_cache(page);
>   	ClearPageMappedToDisk(page);
>  +	delete_from_page_cache(page);
> + 	/* this must be after the remove_from_page_cache which
> + 	 * calls cleancache_put_page (and note page->mapping is now NULL)
> + 	 */
> + 	cleancache_flush_page(mapping, page);
>  -	page_cache_release(page);	/* pagecache ref */
>   	return 0;
>   }

I did the cleancache_flush_page() before the delete_from_page_cache(),
in case the delete_from_page_cache() freed the page.  I didn't actually
check whether that makes sense though.

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