IMNT_CAN_RWTORO
mp->mnt_iflag |= IMNT_MPSAFE | IMNT_CAN_RWTORO | IMNT_SHRLOOKUP |
(mp->mnt_iflag & IMNT_CAN_RWTORO) == 0) {
mp->mnt_iflag |= IMNT_MPSAFE | IMNT_CAN_RWTORO;
mp->mnt_iflag |= IMNT_MPSAFE | IMNT_CAN_RWTORO | IMNT_SHRLOOKUP |
mp->mnt_iflag |= IMNT_CAN_RWTORO;