filemap: Convert filemap_fault to folio
Instead of converting back-and-forth between the actual page and the head page, just convert once at the end of the function where we set the vmf->page. Saves 241 bytes of text, or 15% of the size of filemap_fault(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
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