RFS_OPEN_SHIFT
if ((rf_sc->sc_state & 1 << (DISKPART(dev) + RFS_OPEN_SHIFT)) == 0)
rf_sc->sc_state &= ~(1 << (DISKPART(dev) + RFS_OPEN_SHIFT));
if ((rf_sc->sc_state & 1 << (DISKPART(dev) + RFS_OPEN_SHIFT)) == 0)
if ((rf_sc->sc_state & (1 << (DISKPART(buf->b_dev) + RFS_OPEN_SHIFT)))