--- old/usr/src/uts/common/fs/zfs/vdev_mirror.c	Mon Apr  7 00:45:27 2008
+++ new/usr/src/uts/common/fs/zfs/vdev_mirror.c	Mon Apr  7 00:45:27 2008
@@ -467,6 +467,7 @@
 	vdev_mirror_io_start,
 	vdev_mirror_io_done,
 	vdev_mirror_state_change,
+	NULL,
 	VDEV_TYPE_MIRROR,	/* name of this vdev type */
 	B_FALSE			/* not a leaf vdev */
 };
@@ -479,6 +480,7 @@
 	vdev_mirror_io_start,
 	vdev_mirror_io_done,
 	vdev_mirror_state_change,
+	NULL,
 	VDEV_TYPE_REPLACING,	/* name of this vdev type */
 	B_FALSE			/* not a leaf vdev */
 };
@@ -491,6 +493,7 @@
 	vdev_mirror_io_start,
 	vdev_mirror_io_done,
 	vdev_mirror_state_change,
+	NULL,
 	VDEV_TYPE_SPARE,	/* name of this vdev type */
 	B_FALSE			/* not a leaf vdev */
 };