Index: linux-2.6.17-rc5-mm2/mm/migrate.c
===================================================================
--- linux-2.6.17-rc5-mm2.orig/mm/migrate.c	2006-06-01 09:52:22.302988094 -0700
+++ linux-2.6.17-rc5-mm2/mm/migrate.c	2006-06-01 09:52:58.071282111 -0700
@@ -315,6 +315,17 @@ static int migrate_page_move_mapping(str
 	}
 
 	/*
+	 * Make sure that we do not dirty pages for pages without
+	 * migration functions.
+	 */
+	if (mapping->a_ops && !mapping->a_ops->migratepage) {
+		smp_rmb();
+		if (PageDirty(page)) {
+			write_unlock_irq(&mapping->tree_lock);
+			return -EAGAIN;
+		}
+	}
+	/*
 	 * Now we know that no one else is looking at the page.
 	 */
 	get_page(newpage);