ZFS_LOGBIAS_LATENCY
{ "latency", ZFS_LOGBIAS_LATENCY },
zprop_register_index(ZFS_PROP_LOGBIAS, "logbias", ZFS_LOGBIAS_LATENCY,
ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
os->os_logbias = ZFS_LOGBIAS_LATENCY;