TXG_CLEAN
for (ms = txg_list_head(tl, TXG_CLEAN(txg)); ms;
ms = txg_list_next(tl, ms, TXG_CLEAN(txg))) {
ASSERT0(range_tree_space(msp->ms_allocating[TXG_CLEAN(txg)
while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg)))
boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg));
while ((msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg)))
(void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg));
(void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg));
txg_list_head(&spa->spa_vdev_txg_list, TXG_CLEAN(txg)); vd != NULL;
vd = txg_list_next(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)))
ASSERT3P(txg_list_head(&vd->vdev_ms_list, TXG_CLEAN(txg)), ==, NULL);
ASSERT0(svr->svr_max_offset_to_sync[TXG_CLEAN(txg) & TXG_MASK]);