sbp2_lun
struct sbp2_lun *s_lun; /* unit we belong to */
_NOTE(MUTEX_PROTECTS_DATA(sbp2_tgt::t_mutex, sbp2_lun))
_NOTE(SCHEME_PROTECTS_DATA("stable data", sbp2_lun::{
_NOTE(SCHEME_PROTECTS_DATA("t_mgt_agent_cv", sbp2_lun::l_login_resp))