static int
mtclose(dev_t dev, int flag, int fmt, struct lwp *l)
{
struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev));
if (sc->sc_flags & MTF_WRT) {
(void) mtcommand(dev, MTWEOF, 2);
(void) mtcommand(dev, MTBSF, 0);
}
if ((minor(dev) & T_NOREWIND) == 0)
(void) mtcommand(dev, MTREW, 0);
sc->sc_flags &= ~MTF_OPEN;
tprintf_close(sc->sc_ttyp);
return 0;
}
int
mtopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct mt_softc *sc;
int req_den;
int error;
sc = device_lookup_private(&mt_cd, MTUNIT(dev));
if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0)
return (ENXIO);
if (sc->sc_flags & MTF_OPEN)
return (EBUSY);
DPRINTF(MDB_ANY, ("%s open: flags 0x%x", device_xname(sc->sc_dev),
sc->sc_flags));
sc->sc_flags |= MTF_OPEN;
sc->sc_ttyp = tprintf_open(l->l_proc);
if ((sc->sc_flags & MTF_ALIVE) == 0) {
error = mtcommand(dev, MTRESET, 0);
if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0)
goto errout;
if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE)
(void) mtcommand(dev, MTREW, 0);
}
for (;;) {
if ((error = mtcommand(dev, MTNOP, 0)) != 0)
goto errout;
if (!(sc->sc_flags & MTF_REW))
break;
error = kpause("mt", true, hz, NULL);
if (error != 0 && error != EWOULDBLOCK) {
error = EINTR;
goto errout;
}
}
if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) {
error = EROFS;
goto errout;
}
if (!(sc->sc_stat1 & SR1_ONLINE)) {
uprintf("%s: not online\n", device_xname(sc->sc_dev));
error = EIO;
goto errout;
}
/*
* Select density:
* - find out what density the drive is set to
* (i.e. the density of the current tape)
* - if we are going to write
* - if we're not at the beginning of the tape
* - complain if we want to change densities
* - otherwise, select the mtcommand to set the density
*
* If the drive doesn't support it then don't change the recorded
* density.
*
* The original MOREbsd code had these additional conditions
* for the mid-tape change
*
* req_den != T_BADBPI &&
* sc->sc_density != T_6250BPI
*
* which suggests that it would be possible to write multiple
* densities if req_den == T_BAD_BPI or the current tape
* density was 6250. Testing of our 7980 suggests that the
* device cannot change densities mid-tape.
*
* [email protected]
*/
sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : (
(sc->sc_stat3 & SR3_1600) ? T_1600BPI : (
(sc->sc_stat3 & SR3_800) ? T_800BPI : -1));
req_den = (dev & T_DENSEL);
if (flag & FWRITE) {
if (!(sc->sc_stat1 & SR1_BOT)) {
if (sc->sc_density != req_den) {
uprintf("%s: can't change density mid-tape\n",
device_xname(sc->sc_dev));
error = EIO;
goto errout;
}
}
else {
int mtset_density =
(req_den == T_800BPI ? MTSET800BPI : (
req_den == T_1600BPI ? MTSET1600BPI : (
req_den == T_6250BPI ? MTSET6250BPI : (
sc->sc_type == MT7980ID
? MTSET6250DC
: MTSET6250BPI))));
if (mtcommand(dev, mtset_density, 0) == 0)
sc->sc_density = req_den;
}
}
return (0);
errout:
sc->sc_flags &= ~MTF_OPEN;
return (error);
}
