--- old/usr/src/uts/common/fs/zfs/vdev_disk.c	Mon Apr  7 00:45:26 2008
+++ new/usr/src/uts/common/fs/zfs/vdev_disk.c	Mon Apr  7 00:45:26 2008
@@ -555,6 +555,7 @@
 	vdev_disk_io_start,
 	vdev_disk_io_done,
 	NULL,
+	NULL,
 	VDEV_TYPE_DISK,		/* name of this vdev type */
 	B_TRUE			/* leaf vdev */
 };