diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 811e534..044467e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -691,6 +691,7 @@
 	int page_order;
 	int nr_entries;
 	unsigned long offset;
+	int null_mapped;
 };
 
 struct req_iterator {