abd_zero
extern inline void abd_zero(abd_t *abd, size_t size);
abd_zero(ub_abd, VDEV_UBERBLOCK_SIZE(vd));
abd_zero(ic->ic_data, ic->ic_data->abd_size);
abd_zero(vp_abd, sizeof (vdev_phys_t));
abd_zero(ub_abd, VDEV_UBERBLOCK_RING);
abd_zero(bootenv, VDEV_PAD_SIZE);
abd_zero(abd, VDEV_PAD_SIZE);
abd_zero(ub_abd, VDEV_UBERBLOCK_SIZE(vd));
abd_zero(vp_abd, sizeof (vdev_phys_t));