SBD_MFLAG_RESERVED
mp->sbm_flags |= SBD_MFLAG_RESERVED;
ASSERT(mp->sbm_flags & SBD_MFLAG_RESERVED);
ASSERT(t_mp->sbm_flags & SBD_MFLAG_RESERVED);
ASSERT(s_mp->sbm_flags & SBD_MFLAG_RESERVED);
t_mp->sbm_flags &= ~SBD_MFLAG_RESERVED;
if (t_mp->sbm_flags & SBD_MFLAG_RESERVED)
s_mp->sbm_flags |= SBD_MFLAG_RESERVED;
t_mp->sbm_flags |= SBD_MFLAG_RESERVED;
s_mp->sbm_flags &= ~SBD_MFLAG_RESERVED;
if (mp->sbm_flags & SBD_MFLAG_RESERVED) {