linux-kernel - Re: [PATCH 03/12] mm: Methods for teaching filesystems about PG

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Message-ID: <4FE1F109.1060200@redhat.com>
Date:	Wed, 20 Jun 2012 11:49:29 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	Linux-NFS <linux-nfs@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Neil Brown <neilb@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Christie <michaelc@...wisc.edu>,
	Eric B Munson <emunson@...bm.net>
Subject: Re: [PATCH 03/12] mm: Methods for teaching filesystems about PG_swapcache
 pages

On 06/20/2012 05:37 AM, Mel Gorman wrote:
> In order to teach filesystems to handle swap cache pages, three new
> page functions are introduced:
>
>    pgoff_t page_file_index(struct page *);
>    loff_t page_file_offset(struct page *);
>    struct address_space *page_file_mapping(struct page *);
>
> page_file_index() - gives the offset of this page in the file in
> PAGE_CACHE_SIZE blocks. Like page->index is for mapped pages, this
> function also gives the correct index for PG_swapcache pages.
>
> page_file_offset() - uses page_file_index(), so that it will give
> the expected result, even for PG_swapcache pages.
>
> page_file_mapping() - gives the mapping backing the actual page;
> that is for swap cache pages it will give swap_file->f_mapping.
>
> Signed-off-by: Peter Zijlstra<a.p.zijlstra@...llo.nl>
> Signed-off-by: Mel Gorman<mgorman@...e.de>

Reviewed-by: Rik van Riel<riel@...hat.com>

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