VDEV_UBERBLOCK_COUNT
for (int n = 0; n < VDEV_UBERBLOCK_COUNT(vd); n++) {
for (int i = 0; i < VDEV_UBERBLOCK_COUNT(&vd); i++) {
for (int i = 0; i < VDEV_UBERBLOCK_COUNT(&vd); i++) {
for (i = 0; i < VDEV_UBERBLOCK_COUNT(ashift); i++) {
offset = VDEV_UBERBLOCK_OFFSET(vd, VDEV_UBERBLOCK_COUNT(vd) -
for (int n = 0; n < VDEV_UBERBLOCK_COUNT(vd); n++) {
int n = ub->ub_txg % (VDEV_UBERBLOCK_COUNT(vd) - m);