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It's slightly more efficient to go directly from the mapping to the superblock than to go from the page. Now that these routines have the mapping passed to them, there's no reason not to use it. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: Al Viro <viro@zeniv.linux.org.uk>