l2arc_rebuild_vdev
void l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen);
l2arc_rebuild_vdev(adddev->l2ad_vdev, B_FALSE);
void l2arc_rebuild_vdev(vdev_t *vd, boolean_t reopen);
l2arc_rebuild_vdev(vd, B_TRUE);