diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7a54244..fbe8ba2 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -358,6 +358,11 @@
 	unsigned int		max_sectors;	/* per-device max sectors */
 	unsigned int		cdb_len;
 
+	/* per-dev xfer mask */
+	unsigned int		pio_mask;
+	unsigned int		mwdma_mask;
+	unsigned int		udma_mask;
+
 	/* for CHS addressing */
 	u16			cylinders;	/* Number of cylinders */
 	u16			heads;		/* Number of heads */