TXG
nvlist_add_uint64(poolnv, ZPOOL_CONFIG_POOL_TXG, TXG);
nvlist_add_uint64(diskvdevnv, ZPOOL_CONFIG_CREATE_TXG, TXG);
nvlist_add_uint64(rootvdevnv, ZPOOL_CONFIG_CREATE_TXG, TXG);
ub->ub_txg = TXG;
ds->phys->ds_creation_txg = TXG - 1;
ds->phys->ds_prev_snap_txg = TXG - 1;
BP_SET_BIRTH(bp, TXG, TXG);