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* st_touch_tape(): start probing at the block size from the sense data if 

we have it.

* st_unmount(): reset density to the device default. This prevents using
  stale density values after changing to a medium with different density.

  Section 9.3.3 of the SCSI specs states that a device shall return the
  density value specified in the last succesfull MODE SELECT after an
  unload operation, in case it is not able to automatically determine
  the density of the new medium.
This commit is contained in:
pk 2000-11-03 10:46:18 +00:00
parent e3aaa6c1ab
commit 4c7351ec7d
1 changed files with 39 additions and 13 deletions
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28
sys/dev/scsipi/st.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: st.c,v 1.130 2000/11/03 10:22:02 pk Exp $ */
/* $NetBSD: st.c,v 1.131 2000/11/03 10:46:18 pk Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -969,6 +969,23 @@ st_unmount(st, eject)
SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n"));
st_check_eod(st, FALSE, &nmarks, XS_CTL_IGNORE_NOT_READY);
st_rewind(st, 0, XS_CTL_IGNORE_NOT_READY);
/*
* Section 9.3.3 of the SCSI specs states that a device shall return
* the density value specified in the last succesfull MODE SELECT
* after an unload operation, in case it is not able to
* automatically determine the density of the new medium.
*
* So we instruct the device to use the default density, which will
* prevent the use of stale density values (in particular,
* in st_touch_tape().
*/
st->density = 0;
if (st_mode_select(st, 0) != 0) {
printf("%s: WARNING: cannot revert to default density\n",
st->sc_dev.dv_xname);
}
scsipi_prevent(sc_link, PR_ALLOW,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY);
if (eject)
@ -2545,7 +2562,16 @@ st_touch_tape(st)
if ((error = st_mode_sense(st, 0)) != 0)
goto bad;
/*
* If the block size is already known from the
* sense data, use it. Else start probing at 1024.
*/
if (st->media_blksize > 0)
st->blksize = st->media_blksize;
else
st->blksize = 1024;
do {
switch (st->blksize) {
case 512: