spa_vdev_detach
error = spa_vdev_detach(spa, oldguid, pguid, B_FALSE);
if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0)
if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0)
extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
error = spa_vdev_detach(spa, zc->zc_guid, 0, B_FALSE);