Awatmath.1259
net.bugs.4bsd
utzoo!decvax!watmath!dmmartindale
Sun Dec 13 04:46:38 1981
Tape UNSAFE error
I suspect the problem with the TM11 UNSAFE is identical to the
same bug in the ht driver. What happens is that the first open
attempt causes a SENSE operation to be done; this sets UNSAFE if
the drive is offline. When the second open attempt is made, the
error bit is still sitting there but gets cleared in the process
of checking. I fixed it by making sure a drive clear is done if
necessary. Below are the changes I made in ht.c; it shouldn't be
too difficult to find the corresponding places in tm.c.
(this code may be more conservative than it needs to be)
htustart(mi)
register struct mba_device *mi;
{
register struct htdevice *htaddr =
(struct htdevice *)mi->mi_drv;
register struct buf *bp = mi->mi_tab.b_actf;
register struct tu_softc *sc = &tu_softc[TUUNIT(bp->b_dev)];
daddr_t blkno;
#ifdef FIX
int sense = 0;
#endif FIX
htaddr->httc = sc->sc_dens;
if (bp == &chtbuf[HTUNIT(bp->b_dev)] && bp->b_command == HT_SENSE) {
htaddr->htcs1 = HT_SENSE|HT_GO;
mbclrattn(mi);
#ifdef FIX
sense++;
#endif FIX
}
sc->sc_dsreg = htaddr->htds;
sc->sc_erreg = htaddr->hter;
sc->sc_resid = htaddr->htfc;
sc->sc_flags &= ~(H_WRITTEN|H_REWIND);
if ((htaddr->htdt & HTDT_SPR) == 0 || (htaddr->htds & HTDS_MOL) == 0)
if (sc->sc_openf > 0)
sc->sc_openf = -1;
#ifdef FIX
if (sense && (htaddr->htds&HTDS_ERR)!=0)
htaddr->htcs1 = HT_DCLR|HT_GO;
#endif FIX
if (sc->sc_openf b_flags |= B_ERROR;
return (MBU_NEXT);
}
-----------------------------------------------------------------
gopher://quux.org/ conversion by John Goerzen <
[email protected]>
of
http://communication.ucsd.edu/A-News/
This Usenet Oldnews Archive
article may be copied and distributed freely, provided:
1. There is no money collected for the text(s) of the articles.
2. The following notice remains appended to each copy:
The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996
Bruce Jones, Henry Spencer, David Wiseman.
