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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> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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