truncate: Convert invalidate_inode_pages2_range to folios

If we're going to unmap a folio, we have to be sure to unmap the entire
folio, not just the part of it which lies after the search index.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>

mm/truncate.c

@@ -599,13 +599,13 @@ static int invalidate_complete_folio2(struct address_space *mapping,
 	return 0;
 }
 
-static int do_launder_page(struct address_space *mapping, struct page *page)
+static int do_launder_folio(struct address_space *mapping, struct folio *folio)
 {
-	if (!PageDirty(page))
+	if (!folio_test_dirty(folio))
 		return 0;
-	if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
+	if (folio->mapping != mapping || mapping->a_ops->launder_page == NULL)
 		return 0;
-	return mapping->a_ops->launder_page(page);
+	return mapping->a_ops->launder_page(&folio->page);
 }
 
 /**
@@ -671,7 +671,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 				unmap_mapping_folio(folio);
 			BUG_ON(folio_mapped(folio));
 
-			ret2 = do_launder_page(mapping, &folio->page);
+			ret2 = do_launder_folio(mapping, folio);
 			if (ret2 == 0) {
 				if (!invalidate_complete_folio2(mapping, folio))
 					ret2 = -EBUSY;