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mm: methods for teaching filesystems about PG_swapcache pages
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 <[email protected]> Signed-off-by: Mel Gorman <[email protected]> Reviewed-by: Rik van Riel <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: David S. Miller <[email protected]> Cc: Eric B Munson <[email protected]> Cc: Eric Paris <[email protected]> Cc: James Morris <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Mike Christie <[email protected]> Cc: Neil Brown <[email protected]> Cc: Sebastian Andrzej Siewior <[email protected]> Cc: Trond Myklebust <[email protected]> Cc: Xiaotian Feng <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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