diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 5131530..252d55d 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -326,9 +326,9 @@
 		}
 	}
 
-	ret = page->mapping->a_ops->prepare_write(NULL, page, 0, PAGE_SIZE);
+	ret = page->mapping->a_ops->prepare_write(bitmap->file, page, 0, PAGE_SIZE);
 	if (!ret)
-		ret = page->mapping->a_ops->commit_write(NULL, page, 0,
+		ret = page->mapping->a_ops->commit_write(bitmap->file, page, 0,
 			PAGE_SIZE);
 	if (ret) {
 		unlock_page(page);