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NetBSD/sys/dev/scsipi/st.c

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/* $NetBSD: st.c,v 1.137 2001/05/06 11:31:08 hannken Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Originally written by Julian Elischer (julian@tfs.com)
* for TRW Financial Systems for use under the MACH(2.5) operating system.
*
* TRW Financial Systems, in accordance with their agreement with Carnegie
* Mellon University, makes this software available to CMU to distribute
* or use in any manner that they see fit as long as this message is kept with
* the software. For this reason TFS also grants any other persons or
* organisations permission to use or modify this software.
*
* TFS supplies this software to be publicly redistributed
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
* major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993
*
* A lot of rewhacking done by mjacob (mjacob@nas.nasa.gov).
*/
#include "opt_scsi.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/mtio.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsi_tape.h>
#include <dev/scsipi/stvar.h>
/* Defines for device specific stuff */
#define DEF_FIXED_BSIZE 512
#define ST_RETRIES 4 /* only on non IO commands */
#define STMODE(z) ( minor(z) & 0x03)
#define STDSTY(z) ((minor(z) >> 2) & 0x03)
#define STUNIT(z) ((minor(z) >> 4) )
#define NORMAL_MODE 0
#define NOREW_MODE 1
#define EJECT_MODE 2
#define CTRL_MODE 3
#define FALSE 0
#define TRUE 1
#define ST_IO_TIME (3 * 60 * 1000) /* 3 minutes */
#define ST_CTL_TIME (30 * 1000) /* 30 seconds */
#define ST_SPC_TIME (4 * 60 * 60 * 1000) /* 4 hours */
#ifndef ST_MOUNT_DELAY
#define ST_MOUNT_DELAY 0
#endif
/*
* Define various devices that we know mis-behave in some way,
* and note how they are bad, so we can correct for them
*/
const struct st_quirk_inquiry_pattern st_quirk_patterns[] = {
{{T_SEQUENTIAL, T_REMOV,
" ", " ", " "}, {0, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */
{ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */
{ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"TANDBERG", " TDC 3600 ", ""}, {0, 12, {
{0, 0, 0}, /* minor 0-3 */
{ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */
{0, 0, QIC_150}, /* minor 8-11 */
{0, 0, QIC_120} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"TANDBERG", " TDC 3800 ", ""}, {0, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{0, 0, QIC_525}, /* minor 4-7 */
{0, 0, QIC_150}, /* minor 8-11 */
{0, 0, QIC_120} /* minor 12-15 */
}}},
/*
* lacking a manual for the 4200, it's not clear what the
* specific density codes should be- the device is a 2.5GB
* capable QIC drive, those density codes aren't readily
* availabel. The 'default' will just have to do.
*/
{{T_SEQUENTIAL, T_REMOV,
"TANDBERG", " TDC 4200 ", ""}, {0, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{0, 0, QIC_525}, /* minor 4-7 */
{0, 0, QIC_150}, /* minor 8-11 */
{0, 0, QIC_120} /* minor 12-15 */
}}},
/*
* At least -005 and -007 need this. I'll assume they all do unless I
* hear otherwise. - mycroft, 31MAR1994
*/
{{T_SEQUENTIAL, T_REMOV,
"ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, {
{ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */
{ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */
{0, 0, QIC_150}, /* minor 8-11 */
{0, 0, QIC_120} /* minor 12-15 */
}}},
/*
* One user reports that this works for his tape drive. It probably
* needs more work. - mycroft, 09APR1994
*/
{{T_SEQUENTIAL, T_REMOV,
"SANKYO ", "CP525 ", ""}, {0, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */
{0, 0, QIC_150}, /* minor 8-11 */
{0, 0, QIC_120} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"ANRITSU ", "DMT780 ", ""}, {0, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */
{0, 0, QIC_150}, /* minor 8-11 */
{0, 0, QIC_120} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"ARCHIVE ", "VIPER 150 21247", ""}, {ST_Q_ERASE_NOIMM, 12, {
{ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */
{0, 0, QIC_150}, /* minor 4-7 */
{0, 0, QIC_120}, /* minor 8-11 */
{0, 0, QIC_24} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"ARCHIVE ", "VIPER 150 21531", ""}, {ST_Q_ERASE_NOIMM, 12, {
{ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */
{0, 0, QIC_150}, /* minor 4-7 */
{0, 0, QIC_120}, /* minor 8-11 */
{0, 0, QIC_24} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"WANGTEK ", "5099ES SCSI", ""}, {0, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{0, 0, QIC_11}, /* minor 4-7 */
{0, 0, QIC_24}, /* minor 8-11 */
{0, 0, QIC_24} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"WANGTEK ", "5150ES SCSI", ""}, {0, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{0, 0, QIC_24}, /* minor 4-7 */
{0, 0, QIC_120}, /* minor 8-11 */
{0, 0, QIC_150} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, {
{0, 0, 0}, /* minor 0-3 */
{ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */
{0, 0, QIC_150}, /* minor 8-11 */
{0, 0, QIC_120} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"WangDAT ", "Model 1300 ", ""}, {0, 0, {
{0, 0, 0}, /* minor 0-3 */
{ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */
{ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */
{ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"EXABYTE ", "EXB-8200 ", "263H"}, {0, 5, {
{0, 0, 0}, /* minor 0-3 */
{0, 0, 0}, /* minor 4-7 */
{0, 0, 0}, /* minor 8-11 */
{0, 0, 0} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"STK", "9490", ""},
{ST_Q_FORCE_BLKSIZE, 0, {
{0, 0, 0}, /* minor 0-3 */
{0, 0, 0}, /* minor 4-7 */
{0, 0, 0}, /* minor 8-11 */
{0, 0, 0} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"STK", "SD-3", ""},
{ST_Q_FORCE_BLKSIZE, 0, {
{0, 0, 0}, /* minor 0-3 */
{0, 0, 0}, /* minor 4-7 */
{0, 0, 0}, /* minor 8-11 */
{0, 0, 0} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"IBM", "03590", ""}, {ST_Q_IGNORE_LOADS, 0, {
{0, 0, 0}, /* minor 0-3 */
{0, 0, 0}, /* minor 4-7 */
{0, 0, 0}, /* minor 8-11 */
{0, 0, 0} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, 0, {
{0, 0, QIC_3095}, /* minor 0-3 */
{0, 0, QIC_3095}, /* minor 4-7 */
{0, 0, QIC_3095}, /* minor 8-11 */
{0, 0, QIC_3095}, /* minor 12-15 */
}}},
#if 0
{{T_SEQUENTIAL, T_REMOV,
"EXABYTE ", "EXB-8200 ", ""}, {0, 12, {
{0, 0, 0}, /* minor 0-3 */
{0, 0, 0}, /* minor 4-7 */
{0, 0, 0}, /* minor 8-11 */
{0, 0, 0} /* minor 12-15 */
}}},
#endif
{{T_SEQUENTIAL, T_REMOV,
"TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, 0, {
{0, 0, 0}, /* minor 0-3 */
{0, 0, 0}, /* minor 4-7 */
{0, 0, 0}, /* minor 8-11 */
{0, 0, 0} /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"OnStream", "ADR50 Drive", ""}, {ST_Q_UNIMODAL, 0, {
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 4-7 */
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */
{ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 12-15 */
}}},
{{T_SEQUENTIAL, T_REMOV,
"NCR H621", "0-STD-03-46F880 ", ""}, {ST_Q_NOPREVENT, 0, {
{0, 0, 0}, /* minor 0-3 */
{0, 0, 0}, /* minor 4-7 */
{0, 0, 0}, /* minor 8-11 */
{0, 0, 0} /* minor 12-15 */
}}},
};
#define NOEJECT 0
#define EJECT 1
void st_identify_drive __P((struct st_softc *,
struct scsipi_inquiry_pattern *));
void st_loadquirks __P((struct st_softc *));
int st_mount_tape __P((dev_t, int));
void st_unmount __P((struct st_softc *, boolean));
int st_decide_mode __P((struct st_softc *, boolean));
void ststart __P((struct scsipi_periph *));
void stdone __P((struct scsipi_xfer *));
int st_read __P((struct st_softc *, char *, int, int));
int st_read_block_limits __P((struct st_softc *, int));
int st_mode_sense __P((struct st_softc *, int));
int st_mode_select __P((struct st_softc *, int));
int st_cmprss __P((struct st_softc *, int));
int st_space __P((struct st_softc *, int, u_int, int));
int st_write_filemarks __P((struct st_softc *, int, int));
int st_check_eod __P((struct st_softc *, boolean, int *, int));
int st_load __P((struct st_softc *, u_int, int));
int st_rewind __P((struct st_softc *, u_int, int));
int st_interpret_sense __P((struct scsipi_xfer *));
int st_touch_tape __P((struct st_softc *));
int st_erase __P((struct st_softc *, int full, int flags));
int st_rdpos __P((struct st_softc *, int, u_int32_t *));
int st_setpos __P((struct st_softc *, int, u_int32_t *));
const struct scsipi_periphsw st_switch = {
st_interpret_sense,
ststart,
NULL,
stdone
};
#define ST_INFO_VALID 0x0001
#define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */
#define ST_WRITTEN 0x0004 /* data has been written, EOD needed */
#define ST_FIXEDBLOCKS 0x0008
#define ST_AT_FILEMARK 0x0010
#define ST_EIO_PENDING 0x0020 /* error reporting deferred until next op */
#define ST_NEW_MOUNT 0x0040 /* still need to decide mode */
#define ST_READONLY 0x0080 /* st_mode_sense says write protected */
#define ST_FM_WRITTEN 0x0100 /*
* EOF file mark written -- used with
* ~ST_WRITTEN to indicate that multiple file
* marks have been written
*/
#define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */
#define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */
#define ST_MOUNTED 0x0800 /* Device is presently mounted */
#define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */
#define ST_EARLYWARN 0x2000 /* Do (deferred) EOM for variable mode */
#define ST_EOM_PENDING 0x4000 /* EOM reporting deferred until next op */
#define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_EOM_PENDING | \
ST_BLANK_READ)
#define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \
ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \
ST_2FM_AT_EOD | ST_PER_ACTION)
#if defined(ST_ENABLE_EARLYWARN)
#define ST_INIT_FLAGS ST_EARLYWARN
#else
#define ST_INIT_FLAGS 0
#endif
/*
* The routine called by the low level scsi routine when it discovers
* A device suitable for this driver
*/
void
stattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct st_softc *st = (void *)self;
struct scsipibus_attach_args *sa = aux;
struct scsipi_periph *periph = sa->sa_periph;
SC_DEBUG(periph, SCSIPI_DB2, ("stattach: "));
/*
* Store information needed to contact our base driver
*/
st->sc_periph = periph;
periph->periph_dev = &st->sc_dev;
periph->periph_switch = &st_switch;
/*
* Set initial flags
*/
st->flags = ST_INIT_FLAGS;
/*
* Check if the drive is a known criminal and take
* Any steps needed to bring it into line
*/
st_identify_drive(st, &sa->sa_inqbuf);
/*
* Use the subdriver to request information regarding the drive.
*/
printf("\n");
printf("%s: %s", st->sc_dev.dv_xname, st->quirkdata ? "rogue, " : "");
if (scsipi_test_unit_ready(periph,
XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE) ||
st_mode_sense(st,
XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE))
printf("drive empty\n");
else {
printf("density code %d, ", st->media_density);
if (st->media_blksize > 0)
printf("%d-byte", st->media_blksize);
else
printf("variable");
printf(" blocks, write-%s\n",
(st->flags & ST_READONLY) ? "protected" : "enabled");
}
/*
* Set up the buf queue for this device
*/
BUFQ_INIT(&st->buf_queue);
#if NRND > 0
rnd_attach_source(&st->rnd_source, st->sc_dev.dv_xname,
RND_TYPE_TAPE, 0);
#endif
}
/*
* Use the inquiry routine in 'scsi_base' to get drive info so we can
* Further tailor our behaviour.
*/
void
st_identify_drive(st, inqbuf)
struct st_softc *st;
struct scsipi_inquiry_pattern *inqbuf;
{
struct st_quirk_inquiry_pattern *finger;
int priority;
finger = (struct st_quirk_inquiry_pattern *)scsipi_inqmatch(inqbuf,
(caddr_t)st_quirk_patterns,
sizeof(st_quirk_patterns) / sizeof(st_quirk_patterns[0]),
sizeof(st_quirk_patterns[0]), &priority);
if (priority != 0) {
st->quirkdata = &finger->quirkdata;
st->drive_quirks = finger->quirkdata.quirks;
st->quirks = finger->quirkdata.quirks; /* start value */
st->page_0_size = finger->quirkdata.page_0_size;
st_loadquirks(st);
}
}
/*
* initialise the subdevices to the default (QUIRK) state.
* this will remove any setting made by the system operator or previous
* operations.
*/
void
st_loadquirks(st)
struct st_softc *st;
{
int i;
struct modes *mode;
struct modes *mode2;
mode = st->quirkdata->modes;
mode2 = st->modes;
for (i = 0; i < 4; i++) {
bzero(mode2, sizeof(struct modes));
st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK |
DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER |
DENSITY_SET_BY_USER);
if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) {
mode2->blksize = mode->blksize;
st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK;
}
if (mode->density) {
mode2->density = mode->density;
st->modeflags[i] |= DENSITY_SET_BY_QUIRK;
}
mode2->quirks |= mode->quirks;
mode++;
mode2++;
}
}
/*
* open the device.
*/
int
stopen(dev, flags, mode, p)
dev_t dev;
int flags;
int mode;
struct proc *p;
{
u_int stmode, dsty;
int error, sflags, unit, tries, ntries;
struct st_softc *st;
struct scsipi_periph *periph;
struct scsipi_adapter *adapt;
unit = STUNIT(dev);
if (unit >= st_cd.cd_ndevs)
return (ENXIO);
st = st_cd.cd_devs[unit];
if (st == NULL)
return (ENXIO);
stmode = STMODE(dev);
dsty = STDSTY(dev);
periph = st->sc_periph;
adapt = periph->periph_channel->chan_adapter;
SC_DEBUG(periph, SCSIPI_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev,
unit, st_cd.cd_ndevs));
/*
* Only allow one at a time
*/
if (periph->periph_flags & PERIPH_OPEN) {
printf("%s: already open\n", st->sc_dev.dv_xname);
return (EBUSY);
}
if ((error = scsipi_adapter_addref(adapt)) != 0)
return (error);
/*
* clear any latched errors.
*/
st->mt_resid = 0;
st->mt_erreg = 0;
st->asc = 0;
st->ascq = 0;
/*
* Catch any unit attention errors. Be silent about this
* unless we're already mounted. We ignore media change
* if we're in control mode or not mounted yet.
*/
if ((st->flags & ST_MOUNTED) == 0 || stmode == CTRL_MODE) {
#ifdef SCSIDEBUG
sflags = XS_CTL_IGNORE_MEDIA_CHANGE;
#else
sflags = XS_CTL_SILENT|XS_CTL_IGNORE_MEDIA_CHANGE;
#endif
} else
sflags = 0;
/*
* If we're already mounted or we aren't configured for
* a mount delay, only try a test unit ready once. Otherwise,
* try up to ST_MOUNT_DELAY times with a rest interval of
* one second between each try.
*/
if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0) {
ntries = 1;
} else {
ntries = ST_MOUNT_DELAY;
}
for (error = tries = 0; tries < ntries; tries++) {
int slpintr, oflags;
/*
* If we had no error, or we're opening the control mode
* device, we jump out right away.
*/
error = scsipi_test_unit_ready(periph, sflags);
if (error == 0 || stmode == CTRL_MODE) {
break;
}
/*
* We had an error.
*
* If we're already mounted or we aren't configured for
* a mount delay, or the error isn't a NOT READY error,
* skip to the error exit now.
*/
if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0 ||
(st->mt_key != SKEY_NOT_READY)) {
goto bad;
}
/*
* clear any latched errors.
*/
st->mt_resid = 0;
st->mt_erreg = 0;
st->asc = 0;
st->ascq = 0;
/*
* Fake that we have the device open so
* we block other apps from getting in.
*/
oflags = periph->periph_flags;
periph->periph_flags |= PERIPH_OPEN;
slpintr = tsleep(&lbolt, PUSER|PCATCH, "stload", 0);
periph->periph_flags = oflags; /* restore flags */
if (slpintr) {
goto bad;
}
}
/*
* If the mode is 3 (e.g. minor = 3,7,11,15) then the device has
* been opened to set defaults and perform other, usually non-I/O
* related, operations. In this case, do a quick check to see
* whether the unit actually had a tape loaded (this will be known
* as to whether or not we got a NOT READY for the above
* unit attention). If a tape is there, go do a mount sequence.
*/
if (stmode == CTRL_MODE && st->mt_key == SKEY_NOT_READY) {
periph->periph_flags |= PERIPH_OPEN;
return (0);
}
/*
* If we get this far and had an error set, that means we failed
* to pass the 'test unit ready' test for the non-controlmode device,
* so we bounce the open.
*/
if (error)
return (error);
/*
* Else, we're now committed to saying we're open.
*/
periph->periph_flags |= PERIPH_OPEN; /* unit attn are now errors */
/*
* If it's a different mode, or if the media has been
* invalidated, unmount the tape from the previous
* session but continue with open processing
*/
if (st->last_dsty != dsty ||
(periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)
st_unmount(st, NOEJECT);
/*
* If we are not mounted, then we should start a new
* mount session.
*/
if (!(st->flags & ST_MOUNTED)) {
if ((error = st_mount_tape(dev, flags)) != 0)
goto bad;
st->last_dsty = dsty;
}
SC_DEBUG(periph, SCSIPI_DB2, ("open complete\n"));
return (0);
bad:
st_unmount(st, NOEJECT);
scsipi_adapter_delref(adapt);
periph->periph_flags &= ~PERIPH_OPEN;
return (error);
}
/*
* close the device.. only called if we are the LAST
* occurence of an open device
*/
int
stclose(dev, flags, mode, p)
dev_t dev;
int flags;
int mode;
struct proc *p;
{
int stxx, error = 0;
struct st_softc *st = st_cd.cd_devs[STUNIT(dev)];
struct scsipi_periph *periph = st->sc_periph;
struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter;
SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("closing\n"));
/*
* Make sure that a tape opened in write-only mode will have
* file marks written on it when closed, even if not written to.
*
* This is for SUN compatibility. Actually, the Sun way of
* things is to:
*
* only write filemarks if there are fmks to be written and
* - open for write (possibly read/write)
* - the last operation was a write
* or:
* - opened for wronly
* - no data was written (including filemarks)
*/
stxx = st->flags & (ST_WRITTEN | ST_FM_WRITTEN);
if (((flags & FWRITE) && stxx == ST_WRITTEN) ||
((flags & O_ACCMODE) == FWRITE && stxx == 0)) {
int nm;
error = st_check_eod(st, FALSE, &nm, 0);
}
switch (STMODE(dev)) {
case NORMAL_MODE:
st_unmount(st, NOEJECT);
break;
case NOREW_MODE:
case CTRL_MODE:
/*
* Leave mounted unless media seems to have been removed.
*
* Otherwise, if we're to terminate a tape with more than one
* filemark [ and because we're not rewinding here ], backspace
* one filemark so that later appends will see an unbroken
* sequence of:
*
* file - FMK - file - FMK ... file - FMK FMK (EOM)
*/
if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
st_unmount(st, NOEJECT);
} else if (error == 0) {
/*
* ST_WRITTEN was preserved from above.
*
* All we need to know here is:
*
* Were we writing this tape and was the last
* operation a write?
*
* Are there supposed to be 2FM at EOD?
*
* If both statements are true, then we backspace
* one filemark.
*/
stxx |= (st->flags & ST_2FM_AT_EOD);
if ((flags & FWRITE) != 0 &&
(stxx == (ST_2FM_AT_EOD|ST_WRITTEN))) {
error = st_space(st, -1, SP_FILEMARKS, 0);
}
}
break;
case EJECT_MODE:
st_unmount(st, EJECT);
break;
}
scsipi_wait_drain(periph);
scsipi_adapter_delref(adapt);
periph->periph_flags &= ~PERIPH_OPEN;
return (error);
}
/*
* Start a new mount session.
* Copy in all the default parameters from the selected device mode.
* and try guess any that seem to be defaulted.
*/
int
st_mount_tape(dev, flags)
dev_t dev;
int flags;
{
int unit;
u_int dsty;
struct st_softc *st;
struct scsipi_periph *periph;
int error = 0;
unit = STUNIT(dev);
dsty = STDSTY(dev);
st = st_cd.cd_devs[unit];
periph = st->sc_periph;
if (st->flags & ST_MOUNTED)
return (0);
SC_DEBUG(periph, SCSIPI_DB1, ("mounting\n "));
st->flags |= ST_NEW_MOUNT;
st->quirks = st->drive_quirks | st->modes[dsty].quirks;
/*
* If the media is new, then make sure we give it a chance to
* to do a 'load' instruction. (We assume it is new.)
*/
if ((error = st_load(st, LD_LOAD, XS_CTL_SILENT)) != 0)
return (error);
/*
* Throw another dummy instruction to catch
* 'Unit attention' errors. Many drives give
* these after doing a Load instruction (with
* the MEDIUM MAY HAVE CHANGED asc/ascq).
*/
scsipi_test_unit_ready(periph, XS_CTL_SILENT); /* XXX */
/*
* Some devices can't tell you much until they have been
* asked to look at the media. This quirk does this.
*/
if (st->quirks & ST_Q_SENSE_HELP)
if ((error = st_touch_tape(st)) != 0)
return (error);
/*
* Load the physical device parameters
* loads: blkmin, blkmax
*/
if ((error = st_read_block_limits(st, 0)) != 0)
return (error);
/*
* Load the media dependent parameters
* includes: media_blksize,media_density,numblks
* As we have a tape in, it should be reflected here.
* If not you may need the "quirk" above.
*/
if ((error = st_mode_sense(st, 0)) != 0)
return (error);
/*
* If we have gained a permanent density from somewhere,
* then use it in preference to the one supplied by
* default by the driver.
*/
if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER))
st->density = st->modes[dsty].density;
else
st->density = st->media_density;
/*
* If we have gained a permanent blocksize
* then use it in preference to the one supplied by
* default by the driver.
*/
st->flags &= ~ST_FIXEDBLOCKS;
if (st->modeflags[dsty] &
(BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) {
st->blksize = st->modes[dsty].blksize;
if (st->blksize)
st->flags |= ST_FIXEDBLOCKS;
} else {
if ((error = st_decide_mode(st, FALSE)) != 0)
return (error);
}
if ((error = st_mode_select(st, 0)) != 0) {
printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname);
return (error);
}
if (!(st->quirks & ST_Q_NOPREVENT)) {
scsipi_prevent(periph, PR_PREVENT,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY);
}
st->flags &= ~ST_NEW_MOUNT;
st->flags |= ST_MOUNTED;
periph->periph_flags |= PERIPH_MEDIA_LOADED; /* move earlier? */
return (0);
}
/*
* End the present mount session.
* Rewind, and optionally eject the tape.
* Reset various flags to indicate that all new
* operations require another mount operation
*/
void
st_unmount(st, eject)
struct st_softc *st;
boolean eject;
{
struct scsipi_periph *periph = st->sc_periph;
int nmarks;
if ((st->flags & ST_MOUNTED) == 0)
return;
SC_DEBUG(periph, SCSIPI_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(periph, PR_ALLOW,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY);
if (eject)
st_load(st, LD_UNLOAD, XS_CTL_IGNORE_NOT_READY);
st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT);
periph->periph_flags &= ~PERIPH_MEDIA_LOADED;
}
/*
* Given all we know about the device, media, mode, 'quirks' and
* initial operation, make a decision as to how we should be set
* to run (regarding blocking and EOD marks)
*/
int
st_decide_mode(st, first_read)
struct st_softc *st;
boolean first_read;
{
SC_DEBUG(st->sc_periph, SCSIPI_DB2, ("starting block mode decision\n"));
/*
* If the drive can only handle fixed-length blocks and only at
* one size, perhaps we should just do that.
*/
if (st->blkmin && (st->blkmin == st->blkmax)) {
st->flags |= ST_FIXEDBLOCKS;
st->blksize = st->blkmin;
SC_DEBUG(st->sc_periph, SCSIPI_DB3,
("blkmin == blkmax of %d\n", st->blkmin));
goto done;
}
/*
* If the tape density mandates (or even suggests) use of fixed
* or variable-length blocks, comply.
*/
switch (st->density) {
case HALFINCH_800:
case HALFINCH_1600:
case HALFINCH_6250:
case DDS:
st->flags &= ~ST_FIXEDBLOCKS;
st->blksize = 0;
SC_DEBUG(st->sc_periph, SCSIPI_DB3,
("density specified variable\n"));
goto done;
case QIC_11:
case QIC_24:
case QIC_120:
case QIC_150:
case QIC_525:
case QIC_1320:
case QIC_3095:
case QIC_3220:
st->flags |= ST_FIXEDBLOCKS;
if (st->media_blksize > 0)
st->blksize = st->media_blksize;
else
st->blksize = DEF_FIXED_BSIZE;
SC_DEBUG(st->sc_periph, SCSIPI_DB3,
("density specified fixed\n"));
goto done;
}
/*
* If we're about to read the tape, perhaps we should choose
* fixed or variable-length blocks and block size according to
* what the drive found on the tape.
*/
if (first_read &&
(!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) ||
(st->media_blksize == DEF_FIXED_BSIZE) ||
(st->media_blksize == 1024))) {
if (st->media_blksize > 0)
st->flags |= ST_FIXEDBLOCKS;
else
st->flags &= ~ST_FIXEDBLOCKS;
st->blksize = st->media_blksize;
SC_DEBUG(st->sc_periph, SCSIPI_DB3,
("Used media_blksize of %d\n", st->media_blksize));
goto done;
}
/*
* We're getting no hints from any direction. Choose variable-
* length blocks arbitrarily.
*/
st->flags &= ~ST_FIXEDBLOCKS;
st->blksize = 0;
SC_DEBUG(st->sc_periph, SCSIPI_DB3,
("Give up and default to variable mode\n"));
done:
/*
* Decide whether or not to write two file marks to signify end-
* of-data. Make the decision as a function of density. If
* the decision is not to use a second file mark, the SCSI BLANK
* CHECK condition code will be recognized as end-of-data when
* first read.
* (I think this should be a by-product of fixed/variable..julian)
*/
switch (st->density) {
/* case 8 mm: What is the SCSI density code for 8 mm, anyway? */
case QIC_11:
case QIC_24:
case QIC_120:
case QIC_150:
case QIC_525:
case QIC_1320:
case QIC_3095:
case QIC_3220:
st->flags &= ~ST_2FM_AT_EOD;
break;
default:
st->flags |= ST_2FM_AT_EOD;
}
return (0);
}
/*
* Actually translate the requested transfer into
* one the physical driver can understand
* The transfer is described by a buf and will include
* only one physical transfer.
*/
void
ststrategy(bp)
struct buf *bp;
{
struct st_softc *st = st_cd.cd_devs[STUNIT(bp->b_dev)];
int s;
SC_DEBUG(st->sc_periph, SCSIPI_DB1,
("ststrategy %ld bytes @ blk %d\n", bp->b_bcount, bp->b_blkno));
/*
* If it's a null transfer, return immediatly
*/
if (bp->b_bcount == 0)
goto done;
/* If offset is negative, error */
if (bp->b_blkno < 0) {
bp->b_error = EINVAL;
goto bad;
}
/*
* Odd sized request on fixed drives are verboten
*/
if (st->flags & ST_FIXEDBLOCKS) {
if (bp->b_bcount % st->blksize) {
printf("%s: bad request, must be multiple of %d\n",
st->sc_dev.dv_xname, st->blksize);
bp->b_error = EIO;
goto bad;
}
}
/*
* as are out-of-range requests on variable drives.
*/
else if (bp->b_bcount < st->blkmin ||
(st->blkmax && bp->b_bcount > st->blkmax)) {
printf("%s: bad request, must be between %d and %d\n",
st->sc_dev.dv_xname, st->blkmin, st->blkmax);
bp->b_error = EIO;
goto bad;
}
s = splbio();
/*
* Place it in the queue of activities for this tape
* at the end (a bit silly because we only have on user..
* (but it could fork()))
*/
BUFQ_INSERT_TAIL(&st->buf_queue, bp);
/*
* Tell the device to get going on the transfer if it's
* not doing anything, otherwise just wait for completion
* (All a bit silly if we're only allowing 1 open but..)
*/
ststart(st->sc_periph);
splx(s);
return;
bad:
bp->b_flags |= B_ERROR;
done:
/*
* Correctly set the buf to indicate a completed xfer
*/
bp->b_resid = bp->b_bcount;
biodone(bp);
return;
}
/*
* ststart looks to see if there is a buf waiting for the device
* and that the device is not already busy. If both are true,
* It dequeues the buf and creates a scsi command to perform the
* transfer required. The transfer request will call scsipi_done
* on completion, which will in turn call this routine again
* so that the next queued transfer is performed.
* The bufs are queued by the strategy routine (ststrategy)
*
* This routine is also called after other non-queued requests
* have been made of the scsi driver, to ensure that the queue
* continues to be drained.
* ststart() is called at splbio
*/
void
ststart(periph)
struct scsipi_periph *periph;
{
struct st_softc *st = (void *)periph->periph_dev;
struct buf *bp;
struct scsi_rw_tape cmd;
int flags, error;
SC_DEBUG(periph, SCSIPI_DB2, ("ststart "));
/*
* See if there is a buf to do and we are not already
* doing one
*/
while (periph->periph_active < periph->periph_openings) {
/* if a special awaits, let it proceed first */
if (periph->periph_flags & PERIPH_WAITING) {
periph->periph_flags &= ~PERIPH_WAITING;
wakeup((caddr_t)periph);
return;
}
if ((bp = BUFQ_FIRST(&st->buf_queue)) == NULL)
return;
BUFQ_REMOVE(&st->buf_queue, bp);
/*
* If the device has been unmounted by the user
* then throw away all requests until done.
*/
if ((st->flags & ST_MOUNTED) == 0 ||
(periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
/* make sure that one implies the other.. */
periph->periph_flags &= ~PERIPH_MEDIA_LOADED;
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
bp->b_resid = bp->b_bcount;
biodone(bp);
continue;
}
/*
* only FIXEDBLOCK devices have pending I/O or space operations.
*/
if (st->flags & ST_FIXEDBLOCKS) {
/*
* If we are at a filemark but have not reported it yet
* then we should report it now
*/
if (st->flags & ST_AT_FILEMARK) {
if ((bp->b_flags & B_READ) == B_WRITE) {
/*
* Handling of ST_AT_FILEMARK in
* st_space will fill in the right file
* mark count.
* Back up over filemark
*/
if (st_space(st, 0, SP_FILEMARKS, 0)) {
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
biodone(bp);
continue;
}
} else {
bp->b_resid = bp->b_bcount;
bp->b_error = 0;
bp->b_flags &= ~B_ERROR;
st->flags &= ~ST_AT_FILEMARK;
biodone(bp);
continue; /* seek more work */
}
}
}
/*
* If we are at EOM but have not reported it
* yet then we should report it now.
*/
if (st->flags & (ST_EOM_PENDING|ST_EIO_PENDING)) {
bp->b_resid = bp->b_bcount;
if (st->flags & ST_EIO_PENDING) {
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
}
st->flags &= ~(ST_EOM_PENDING|ST_EIO_PENDING);
biodone(bp);
continue; /* seek more work */
}
/*
* Fill out the scsi command
*/
bzero(&cmd, sizeof(cmd));
flags = XS_CTL_NOSLEEP | XS_CTL_ASYNC;
if ((bp->b_flags & B_READ) == B_WRITE) {
cmd.opcode = WRITE;
st->flags &= ~ST_FM_WRITTEN;
flags |= XS_CTL_DATA_OUT;
} else {
cmd.opcode = READ;
flags |= XS_CTL_DATA_IN;
}
/*
* Handle "fixed-block-mode" tape drives by using the
* block count instead of the length.
*/
if (st->flags & ST_FIXEDBLOCKS) {
cmd.byte2 |= SRW_FIXED;
_lto3b(bp->b_bcount / st->blksize, cmd.len);
} else
_lto3b(bp->b_bcount, cmd.len);
/*
* go ask the adapter to do all this for us
*/
error = scsipi_command(periph,
(struct scsipi_generic *)&cmd, sizeof(cmd),
(u_char *)bp->b_data, bp->b_bcount,
0, ST_IO_TIME, bp, flags);
if (error) {
printf("%s: not queued, error %d\n",
st->sc_dev.dv_xname, error);
}
} /* go back and see if we can cram more work in.. */
}
void
stdone(xs)
struct scsipi_xfer *xs;
{
struct st_softc *st = (void *)xs->xs_periph->periph_dev;
if (xs->bp != NULL) {
if ((xs->bp->b_flags & B_READ) == B_WRITE) {
st->flags |= ST_WRITTEN;
} else {
st->flags &= ~ST_WRITTEN;
}
#if NRND > 0
rnd_add_uint32(&st->rnd_source, xs->bp->b_blkno);
#endif
}
}
int
stread(dev, uio, iomode)
dev_t dev;
struct uio *uio;
int iomode;
{
struct st_softc *st = st_cd.cd_devs[STUNIT(dev)];
return (physio(ststrategy, NULL, dev, B_READ,
st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio));
}
int
stwrite(dev, uio, iomode)
dev_t dev;
struct uio *uio;
int iomode;
{
struct st_softc *st = st_cd.cd_devs[STUNIT(dev)];
return (physio(ststrategy, NULL, dev, B_WRITE,
st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio));
}
/*
* Perform special action on behalf of the user;
* knows about the internals of this device
*/
int
stioctl(dev, cmd, arg, flag, p)
dev_t dev;
u_long cmd;
caddr_t arg;
int flag;
struct proc *p;
{
int error = 0;
int unit;
int number, nmarks, dsty;
int flags;
struct st_softc *st;
int hold_blksize;
u_int8_t hold_density;
struct mtop *mt = (struct mtop *) arg;
/*
* Find the device that the user is talking about
*/
flags = 0; /* give error messages, act on errors etc. */
unit = STUNIT(dev);
dsty = STDSTY(dev);
st = st_cd.cd_devs[unit];
hold_blksize = st->blksize;
hold_density = st->density;
switch ((u_int) cmd) {
case MTIOCGET: {
struct mtget *g = (struct mtget *) arg;
/*
* (to get the current state of READONLY)
*/
error = st_mode_sense(st, XS_CTL_SILENT);
if (error) {
/*
* Ignore the error if in control mode;
* this is mandated by st(4).
*/
if (STMODE(dev) != CTRL_MODE)
break;
error = 0;
}
SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[ioctl: get status]\n"));
bzero(g, sizeof(struct mtget));
g->mt_type = 0x7; /* Ultrix compat *//*? */
g->mt_blksiz = st->blksize;
g->mt_density = st->density;
g->mt_mblksiz[0] = st->modes[0].blksize;
g->mt_mblksiz[1] = st->modes[1].blksize;
g->mt_mblksiz[2] = st->modes[2].blksize;
g->mt_mblksiz[3] = st->modes[3].blksize;
g->mt_mdensity[0] = st->modes[0].density;
g->mt_mdensity[1] = st->modes[1].density;
g->mt_mdensity[2] = st->modes[2].density;
g->mt_mdensity[3] = st->modes[3].density;
if (st->flags & ST_READONLY)
g->mt_dsreg |= MT_DS_RDONLY;
if (st->flags & ST_MOUNTED)
g->mt_dsreg |= MT_DS_MOUNTED;
g->mt_resid = st->mt_resid;
g->mt_erreg = st->mt_erreg;
/*
* clear latched errors.
*/
st->mt_resid = 0;
st->mt_erreg = 0;
st->asc = 0;
st->ascq = 0;
break;
}
case MTIOCTOP: {
SC_DEBUG(st->sc_periph, SCSIPI_DB1,
("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op,
mt->mt_count));
/* compat: in U*x it is a short */
number = mt->mt_count;
switch ((short) (mt->mt_op)) {
case MTWEOF: /* write an end-of-file record */
error = st_write_filemarks(st, number, flags);
break;
case MTBSF: /* backward space file */
number = -number;
case MTFSF: /* forward space file */
error = st_check_eod(st, FALSE, &nmarks, flags);
if (!error)
error = st_space(st, number - nmarks,
SP_FILEMARKS, flags);
break;
case MTBSR: /* backward space record */
number = -number;
case MTFSR: /* forward space record */
error = st_check_eod(st, TRUE, &nmarks, flags);
if (!error)
error = st_space(st, number, SP_BLKS, flags);
break;
case MTREW: /* rewind */
error = st_rewind(st, 0, flags);
break;
case MTOFFL: /* rewind and put the drive offline */
st_unmount(st, EJECT);
break;
case MTNOP: /* no operation, sets status only */
break;
case MTRETEN: /* retension the tape */
error = st_load(st, LD_RETENSION, flags);
if (!error)
error = st_load(st, LD_LOAD, flags);
break;
case MTEOM: /* forward space to end of media */
error = st_check_eod(st, FALSE, &nmarks, flags);
if (!error)
error = st_space(st, 1, SP_EOM, flags);
break;
case MTCACHE: /* enable controller cache */
st->flags &= ~ST_DONTBUFFER;
goto try_new_value;
case MTNOCACHE: /* disable controller cache */
st->flags |= ST_DONTBUFFER;
goto try_new_value;
case MTERASE: /* erase volume */
error = st_erase(st, number, flags);
break;
case MTSETBSIZ: /* Set block size for device */
#ifdef NOTYET
if (!(st->flags & ST_NEW_MOUNT)) {
uprintf("re-mount tape before changing blocksize");
error = EINVAL;
break;
}
#endif
if (number == 0)
st->flags &= ~ST_FIXEDBLOCKS;
else {
if ((st->blkmin || st->blkmax) &&
(number < st->blkmin ||
number > st->blkmax)) {
error = EINVAL;
break;
}
st->flags |= ST_FIXEDBLOCKS;
}
st->blksize = number;
st->flags |= ST_BLOCK_SET; /*XXX */
goto try_new_value;
case MTSETDNSTY: /* Set density for device and mode */
/*
* Any number >= 0 and <= 0xff is legal. Numbers
* above 0x80 are 'vendor unique'.
*/
if (number < 0 || number > 255) {
error = EINVAL;
break;
} else
st->density = number;
goto try_new_value;
case MTCMPRESS:
error = st_cmprss(st, number);
break;
case MTEWARN:
if (number)
st->flags |= ST_EARLYWARN;
else
st->flags &= ~ST_EARLYWARN;
break;
default:
error = EINVAL;
}
break;
}
case MTIOCIEOT:
case MTIOCEEOT:
break;
case MTIOCRDSPOS:
error = st_rdpos(st, 0, (u_int32_t *) arg);
break;
case MTIOCRDHPOS:
error = st_rdpos(st, 1, (u_int32_t *) arg);
break;
case MTIOCSLOCATE:
error = st_setpos(st, 0, (u_int32_t *) arg);
break;
case MTIOCHLOCATE:
error = st_setpos(st, 1, (u_int32_t *) arg);
break;
default:
error = scsipi_do_ioctl(st->sc_periph, dev, cmd, arg,
flag, p);
break;
}
return (error);
/*-----------------------------*/
try_new_value:
/*
* Check that the mode being asked for is aggreeable to the
* drive. If not, put it back the way it was.
*
* If in control mode, we can make (persistent) mode changes
* even if no medium is loaded (see st(4)).
*/
if ((STMODE(dev) != CTRL_MODE || (st->flags & ST_MOUNTED) != 0) &&
(error = st_mode_select(st, 0)) != 0) {
/* put it back as it was */
printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname);
st->density = hold_density;
st->blksize = hold_blksize;
if (st->blksize)
st->flags |= ST_FIXEDBLOCKS;
else
st->flags &= ~ST_FIXEDBLOCKS;
return (error);
}
/*
* As the drive liked it, if we are setting a new default,
* set it into the structures as such.
*
* The means for deciding this are not finalised yet- but
* if the device was opened in Control Mode, the values
* are persistent now across mounts.
*/
if (STMODE(dev) == CTRL_MODE) {
switch ((short) (mt->mt_op)) {
case MTSETBSIZ:
st->modes[dsty].blksize = st->blksize;
st->modeflags[dsty] |= BLKSIZE_SET_BY_USER;
break;
case MTSETDNSTY:
st->modes[dsty].density = st->density;
st->modeflags[dsty] |= DENSITY_SET_BY_USER;
break;
}
}
return (0);
}
/*
* Do a synchronous read.
*/
int
st_read(st, buf, size, flags)
struct st_softc *st;
int size;
int flags;
char *buf;
{
struct scsi_rw_tape cmd;
/*
* If it's a null transfer, return immediatly
*/
if (size == 0)
return (0);
bzero(&cmd, sizeof(cmd));
cmd.opcode = READ;
if (st->flags & ST_FIXEDBLOCKS) {
cmd.byte2 |= SRW_FIXED;
_lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE),
cmd.len);
} else
_lto3b(size, cmd.len);
return (scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd),
(u_char *)buf, size, 0, ST_IO_TIME, NULL, flags | XS_CTL_DATA_IN));
}
/*
* Ask the drive what it's min and max blk sizes are.
*/
int
st_read_block_limits(st, flags)
struct st_softc *st;
int flags;
{
struct scsi_block_limits cmd;
struct scsi_block_limits_data block_limits;
struct scsipi_periph *periph = st->sc_periph;
int error;
/*
* do a 'Read Block Limits'
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = READ_BLOCK_LIMITS;
/*
* do the command, update the global values
*/
error = scsipi_command(periph, (struct scsipi_generic *)&cmd,
sizeof(cmd), (u_char *)&block_limits, sizeof(block_limits),
ST_RETRIES, ST_CTL_TIME, NULL,
flags | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK);
if (error)
return (error);
st->blkmin = _2btol(block_limits.min_length);
st->blkmax = _3btol(block_limits.max_length);
SC_DEBUG(periph, SCSIPI_DB3,
("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax));
return (0);
}
/*
* Get the scsi driver to send a full inquiry to the
* device and use the results to fill out the global
* parameter structure.
*
* called from:
* attach
* open
* ioctl (to reset original blksize)
*/
int
st_mode_sense(st, flags)
struct st_softc *st;
int flags;
{
u_int scsipi_sense_len;
int error;
struct scsi_mode_sense cmd;
struct scsipi_sense {
struct scsi_mode_header header;
struct scsi_blk_desc blk_desc;
u_char sense_data[MAX_PAGE_0_SIZE];
} scsipi_sense;
struct scsipi_periph *periph = st->sc_periph;
scsipi_sense_len = 12 + st->page_0_size;
/*
* Set up a mode sense
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = SCSI_MODE_SENSE;
cmd.length = scsipi_sense_len;
/*
* do the command, but we don't need the results
* just print them for our interest's sake, if asked,
* or if we need it as a template for the mode select
* store it away.
*/
error = scsipi_command(periph, (struct scsipi_generic *)&cmd,
sizeof(cmd), (u_char *)&scsipi_sense, scsipi_sense_len,
ST_RETRIES, ST_CTL_TIME, NULL,
flags | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK);
if (error)
return (error);
st->numblks = _3btol(scsipi_sense.blk_desc.nblocks);
st->media_blksize = _3btol(scsipi_sense.blk_desc.blklen);
st->media_density = scsipi_sense.blk_desc.density;
if (scsipi_sense.header.dev_spec & SMH_DSP_WRITE_PROT)
st->flags |= ST_READONLY;
else
st->flags &= ~ST_READONLY;
SC_DEBUG(periph, SCSIPI_DB3,
("density code %d, %d-byte blocks, write-%s, ",
st->media_density, st->media_blksize,
st->flags & ST_READONLY ? "protected" : "enabled"));
SC_DEBUG(periph, SCSIPI_DB3,
("%sbuffered\n",
scsipi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un"));
if (st->page_0_size)
bcopy(scsipi_sense.sense_data, st->sense_data,
st->page_0_size);
periph->periph_flags |= PERIPH_MEDIA_LOADED;
return (0);
}
/*
* Send a filled out parameter structure to the drive to
* set it into the desire modes etc.
*/
int
st_mode_select(st, flags)
struct st_softc *st;
int flags;
{
u_int scsi_select_len;
struct scsi_mode_select cmd;
struct scsi_select {
struct scsi_mode_header header;
struct scsi_blk_desc blk_desc;
u_char sense_data[MAX_PAGE_0_SIZE];
} scsi_select;
struct scsipi_periph *periph = st->sc_periph;
scsi_select_len = 12 + st->page_0_size;
/*
* This quirk deals with drives that have only one valid mode
* and think this gives them license to reject all mode selects,
* even if the selected mode is the one that is supported.
*/
if (st->quirks & ST_Q_UNIMODAL) {
SC_DEBUG(periph, SCSIPI_DB3,
("not setting density 0x%x blksize 0x%x\n",
st->density, st->blksize));
return (0);
}
/*
* Set up for a mode select
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = SCSI_MODE_SELECT;
cmd.length = scsi_select_len;
bzero(&scsi_select, scsi_select_len);
scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc);
scsi_select.header.dev_spec &= ~SMH_DSP_BUFF_MODE;
scsi_select.blk_desc.density = st->density;
if (st->flags & ST_DONTBUFFER)
scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF;
else
scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON;
if (st->flags & ST_FIXEDBLOCKS)
_lto3b(st->blksize, scsi_select.blk_desc.blklen);
if (st->page_0_size)
bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size);
/*
* do the command
*/
return (scsipi_command(periph, (struct scsipi_generic *)&cmd,
sizeof(cmd), (u_char *)&scsi_select, scsi_select_len,
ST_RETRIES, ST_CTL_TIME, NULL,
flags | XS_CTL_DATA_OUT | XS_CTL_DATA_ONSTACK));
}
int
st_cmprss(st, onoff)
struct st_softc *st;
int onoff;
{
u_int scsi_dlen;
struct scsi_mode_select mcmd;
struct scsi_mode_sense scmd;
struct scsi_select {
struct scsi_mode_header header;
struct scsi_blk_desc blk_desc;
u_char pdata[max(sizeof(struct scsi_tape_dev_conf_page),
sizeof(struct scsi_tape_dev_compression_page))];
} scsi_pdata;
struct scsi_tape_dev_conf_page *ptr;
struct scsi_tape_dev_compression_page *cptr;
struct scsipi_periph *periph = st->sc_periph;
int error, ison, flags;
scsi_dlen = sizeof(scsi_pdata);
bzero(&scsi_pdata, scsi_dlen);
/*
* Set up for a mode sense.
* Do DATA COMPRESSION page first.
*/
bzero(&scmd, sizeof(scmd));
scmd.opcode = SCSI_MODE_SENSE;
scmd.page = SMS_PAGE_CTRL_CURRENT | 0xf;
scmd.length = scsi_dlen;
flags = XS_CTL_SILENT;
/*
* Do the MODE SENSE command...
*/
again:
bzero(&scsi_pdata, scsi_dlen);
error = scsipi_command(periph,
(struct scsipi_generic *)&scmd, sizeof(scmd),
(u_char *)&scsi_pdata, scsi_dlen,
ST_RETRIES, ST_CTL_TIME, NULL,
flags | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK);
if (error) {
if (scmd.byte2 != SMS_DBD) {
scmd.byte2 = SMS_DBD;
goto again;
}
/*
* Try a different page?
*/
if (scmd.page == (SMS_PAGE_CTRL_CURRENT | 0xf)) {
scmd.page = SMS_PAGE_CTRL_CURRENT | 0x10;
scmd.byte2 = 0;
goto again;
}
return (error);
}
if (scsi_pdata.header.blk_desc_len)
ptr = (struct scsi_tape_dev_conf_page *) scsi_pdata.pdata;
else
ptr = (struct scsi_tape_dev_conf_page *) &scsi_pdata.blk_desc;
if ((scmd.page & SMS_PAGE_CODE) == 0xf) {
cptr = (struct scsi_tape_dev_compression_page *) ptr;
ison = (cptr->dce_dcc & DCP_DCE) != 0;
if (onoff)
cptr->dce_dcc |= DCP_DCE;
else
cptr->dce_dcc &= ~DCP_DCE;
cptr->pagecode &= ~0x80;
} else {
ison = (ptr->sel_comp_alg != 0);
if (onoff)
ptr->sel_comp_alg = 1;
else
ptr->sel_comp_alg = 0;
ptr->pagecode &= ~0x80;
ptr->byte2 = 0;
ptr->active_partition = 0;
ptr->wb_full_ratio = 0;
ptr->rb_empty_ratio = 0;
ptr->byte8 &= ~0x30;
ptr->gap_size = 0;
ptr->byte10 &= ~0xe7;
ptr->ew_bufsize[0] = 0;
ptr->ew_bufsize[1] = 0;
ptr->ew_bufsize[2] = 0;
ptr->reserved = 0;
}
onoff = onoff ? 1 : 0;
/*
* There might be a virtue in actually doing the MODE SELECTS,
* but let's not clog the bus over it.
*/
if (onoff == ison)
return (0);
/*
* Set up for a mode select
*/
scsi_pdata.header.data_length = 0;
scsi_pdata.header.medium_type = 0;
if ((st->flags & ST_DONTBUFFER) == 0)
scsi_pdata.header.dev_spec = SMH_DSP_BUFF_MODE_ON;
else
scsi_pdata.header.dev_spec = 0;
bzero(&mcmd, sizeof(mcmd));
mcmd.opcode = SCSI_MODE_SELECT;
mcmd.byte2 = SMS_PF;
mcmd.length = scsi_dlen;
if (scsi_pdata.header.blk_desc_len) {
scsi_pdata.blk_desc.density = 0;
scsi_pdata.blk_desc.nblocks[0] = 0;
scsi_pdata.blk_desc.nblocks[1] = 0;
scsi_pdata.blk_desc.nblocks[2] = 0;
}
/*
* Do the command
*/
error = scsipi_command(periph,
(struct scsipi_generic *)&mcmd, sizeof(mcmd),
(u_char *)&scsi_pdata, scsi_dlen,
ST_RETRIES, ST_CTL_TIME, NULL,
flags | XS_CTL_DATA_OUT | XS_CTL_DATA_ONSTACK);
if (error && (scmd.page & SMS_PAGE_CODE) == 0xf) {
/*
* Try DEVICE CONFIGURATION page.
*/
scmd.page = SMS_PAGE_CTRL_CURRENT | 0x10;
goto again;
}
return (error);
}
/*
* issue an erase command
*/
int
st_erase(st, full, flags)
struct st_softc *st;
int full, flags;
{
int tmo;
struct scsi_erase cmd;
/*
* Full erase means set LONG bit in erase command, which asks
* the drive to erase the entire unit. Without this bit, we're
* asking the drive to write an erase gap.
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = ERASE;
if (full) {
cmd.byte2 = SE_LONG;
tmo = ST_SPC_TIME;
} else {
tmo = ST_IO_TIME;
}
/*
* XXX We always do this asynchronously, for now, unless the device
* has the ST_Q_ERASE_NOIMM quirk. How long should we wait if we
* want to (eventually) to it synchronously?
*/
if ((st->quirks & ST_Q_ERASE_NOIMM) == 0)
cmd.byte2 |= SE_IMMED;
return (scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd),
0, 0, ST_RETRIES, tmo, NULL, flags));
}
/*
* skip N blocks/filemarks/seq filemarks/eom
*/
int
st_space(st, number, what, flags)
struct st_softc *st;
u_int what;
int flags;
int number;
{
struct scsi_space cmd;
int error;
switch (what) {
case SP_BLKS:
if (st->flags & ST_PER_ACTION) {
if (number > 0) {
st->flags &= ~ST_PER_ACTION;
return (EIO);
} else if (number < 0) {
if (st->flags & ST_AT_FILEMARK) {
/*
* Handling of ST_AT_FILEMARK
* in st_space will fill in the
* right file mark count.
*/
error = st_space(st, 0, SP_FILEMARKS,
flags);
if (error)
return (error);
}
if (st->flags & ST_BLANK_READ) {
st->flags &= ~ST_BLANK_READ;
return (EIO);
}
st->flags &= ~(ST_EIO_PENDING|ST_EOM_PENDING);
}
}
break;
case SP_FILEMARKS:
if (st->flags & ST_EIO_PENDING) {
if (number > 0) {
/* pretend we just discovered the error */
st->flags &= ~ST_EIO_PENDING;
return (EIO);
} else if (number < 0) {
/* back away from the error */
st->flags &= ~ST_EIO_PENDING;
}
}
if (st->flags & ST_AT_FILEMARK) {
st->flags &= ~ST_AT_FILEMARK;
number--;
}
if ((st->flags & ST_BLANK_READ) && (number < 0)) {
/* back away from unwritten tape */
st->flags &= ~ST_BLANK_READ;
number++; /* XXX dubious */
}
break;
case SP_EOM:
if (st->flags & ST_EOM_PENDING) {
/* we're already there */
st->flags &= ~ST_EOM_PENDING;
return (0);
}
if (st->flags & ST_EIO_PENDING) {
/* pretend we just discovered the error */
st->flags &= ~ST_EIO_PENDING;
return (EIO);
}
if (st->flags & ST_AT_FILEMARK)
st->flags &= ~ST_AT_FILEMARK;
break;
}
if (number == 0)
return (0);
bzero(&cmd, sizeof(cmd));
cmd.opcode = SPACE;
cmd.byte2 = what;
_lto3b(number, cmd.number);
return (scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd),
0, 0, 0, ST_SPC_TIME, NULL, flags));
}
/*
* write N filemarks
*/
int
st_write_filemarks(st, number, flags)
struct st_softc *st;
int flags;
int number;
{
struct scsi_write_filemarks cmd;
/*
* It's hard to write a negative number of file marks.
* Don't try.
*/
if (number < 0)
return (EINVAL);
switch (number) {
case 0: /* really a command to sync the drive's buffers */
break;
case 1:
if (st->flags & ST_FM_WRITTEN) /* already have one down */
st->flags &= ~ST_WRITTEN;
else
st->flags |= ST_FM_WRITTEN;
st->flags &= ~ST_PER_ACTION;
break;
default:
st->flags &= ~(ST_PER_ACTION | ST_WRITTEN);
}
bzero(&cmd, sizeof(cmd));
cmd.opcode = WRITE_FILEMARKS;
_lto3b(number, cmd.number);
return (scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd),
0, 0, 0, ST_IO_TIME * 4, NULL, flags));
}
/*
* Make sure the right number of file marks is on tape if the
* tape has been written. If the position argument is true,
* leave the tape positioned where it was originally.
*
* nmarks returns the number of marks to skip (or, if position
* true, which were skipped) to get back original position.
*/
int
st_check_eod(st, position, nmarks, flags)
struct st_softc *st;
boolean position;
int *nmarks;
int flags;
{
int error;
switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) {
default:
*nmarks = 0;
return (0);
case ST_WRITTEN:
case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD:
*nmarks = 1;
break;
case ST_WRITTEN | ST_2FM_AT_EOD:
*nmarks = 2;
}
error = st_write_filemarks(st, *nmarks, flags);
if (position && !error)
error = st_space(st, -*nmarks, SP_FILEMARKS, flags);
return (error);
}
/*
* load/unload/retension
*/
int
st_load(st, type, flags)
struct st_softc *st;
u_int type;
int flags;
{
int error;
struct scsi_load cmd;
if (type != LD_LOAD) {
int nmarks;
error = st_check_eod(st, FALSE, &nmarks, flags);
if (error) {
printf("%s: failed to write closing filemarks at "
"unload, errno=%d\n", st->sc_dev.dv_xname, error);
return (error);
}
}
if (st->quirks & ST_Q_IGNORE_LOADS) {
if (type == LD_LOAD) {
/*
* If we ignore loads, at least we should try a rewind.
*/
return st_rewind(st, 0, flags);
}
/* otherwise, we should do what's asked of us */
}
bzero(&cmd, sizeof(cmd));
cmd.opcode = LOAD;
cmd.how = type;
error = scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd),
0, 0, ST_RETRIES, ST_SPC_TIME, NULL, flags);
if (error) {
printf("%s: error %d in st_load (op %d)\n",
st->sc_dev.dv_xname, error, type);
}
return (error);
}
/*
* Rewind the device
*/
int
st_rewind(st, immediate, flags)
struct st_softc *st;
u_int immediate;
int flags;
{
struct scsi_rewind cmd;
int error;
int nmarks;
error = st_check_eod(st, FALSE, &nmarks, flags);
if (error) {
printf("%s: failed to write closing filemarks at "
"rewind, errno=%d\n", st->sc_dev.dv_xname, error);
return (error);
}
st->flags &= ~ST_PER_ACTION;
bzero(&cmd, sizeof(cmd));
cmd.opcode = REWIND;
cmd.byte2 = immediate;
error = scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd), 0, 0, ST_RETRIES,
immediate ? ST_CTL_TIME: ST_SPC_TIME, NULL, flags);
if (error) {
printf("%s: error %d trying to rewind\n",
st->sc_dev.dv_xname, error);
}
return (error);
}
int
st_rdpos(st, hard, blkptr)
struct st_softc *st;
int hard;
u_int32_t *blkptr;
{
int error;
u_int8_t posdata[20];
struct scsi_tape_read_position cmd;
/*
* First flush any pending writes...
*/
error = st_write_filemarks(st, 0, XS_CTL_SILENT);
/*
* The latter case is for 'write protected' tapes
* which are too stupid to recognize a zero count
* for writing filemarks as a no-op.
*/
if (error != 0 && error != EACCES && error != EROFS)
return (error);
bzero(&cmd, sizeof(cmd));
bzero(&posdata, sizeof(posdata));
cmd.opcode = READ_POSITION;
if (hard)
cmd.byte1 = 1;
error = scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd), (u_char *)&posdata,
sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL,
XS_CTL_SILENT | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK);
if (error == 0) {
#if 0
printf("posdata:");
for (hard = 0; hard < sizeof(posdata); hard++)
printf("%02x ", posdata[hard] & 0xff);
printf("\n");
#endif
if (posdata[0] & 0x4) /* Block Position Unknown */
error = EINVAL;
else
*blkptr = _4btol(&posdata[4]);
}
return (error);
}
int
st_setpos(st, hard, blkptr)
struct st_softc *st;
int hard;
u_int32_t *blkptr;
{
int error;
struct scsi_tape_locate cmd;
/*
* First flush any pending writes. Strictly speaking,
* we're not supposed to have to worry about this,
* but let's be untrusting.
*/
error = st_write_filemarks(st, 0, XS_CTL_SILENT);
/*
* The latter case is for 'write protected' tapes
* which are too stupid to recognize a zero count
* for writing filemarks as a no-op.
*/
if (error != 0 && error != EACCES && error != EROFS)
return (error);
bzero(&cmd, sizeof(cmd));
cmd.opcode = LOCATE;
if (hard)
cmd.byte2 = 1 << 2;
_lto4b(*blkptr, cmd.blkaddr);
error = scsipi_command(st->sc_periph,
(struct scsipi_generic *)&cmd, sizeof(cmd),
NULL, 0, ST_RETRIES, ST_SPC_TIME, NULL, 0);
/*
* XXX: Note file && block number position now unknown (if
* XXX: these things ever start being maintained in this driver)
*/
return (error);
}
/*
* Look at the returned sense and act on the error and determine
* the unix error number to pass back..., 0 (== report no error),
* -1 = retry the operation, -2 continue error processing.
*/
int
st_interpret_sense(xs)
struct scsipi_xfer *xs;
{
struct scsipi_periph *periph = xs->xs_periph;
struct scsipi_sense_data *sense = &xs->sense.scsi_sense;
struct buf *bp = xs->bp;
struct st_softc *st = (void *)periph->periph_dev;
int retval = EJUSTRETURN;
int doprint = ((xs->xs_control & XS_CTL_SILENT) == 0);
u_int8_t key;
int32_t info;
/*
* If it isn't a extended or extended/deferred error, let
* the generic code handle it.
*/
if ((sense->error_code & SSD_ERRCODE) != 0x70 &&
(sense->error_code & SSD_ERRCODE) != 0x71) { /* DEFFERRED */
return (retval);
}
if (sense->error_code & SSD_ERRCODE_VALID)
info = _4btol(sense->info);
else
info = xs->datalen; /* bad choice if fixed blocks */
key = sense->flags & SSD_KEY;
st->mt_erreg = key;
st->asc = sense->add_sense_code;
st->ascq = sense->add_sense_code_qual;
st->mt_resid = (short) info;
/*
* If the device is not open yet, let generic handle
*/
if ((periph->periph_flags & PERIPH_OPEN) == 0) {
return (retval);
}
if (st->flags & ST_FIXEDBLOCKS) {
xs->resid = info * st->blksize;
if (sense->flags & SSD_EOM) {
if ((st->flags & ST_EARLYWARN) == 0)
st->flags |= ST_EIO_PENDING;
st->flags |= ST_EOM_PENDING;
if (bp)
bp->b_resid = xs->resid;
}
if (sense->flags & SSD_FILEMARK) {
st->flags |= ST_AT_FILEMARK;
if (bp)
bp->b_resid = xs->resid;
}
if (sense->flags & SSD_ILI) {
st->flags |= ST_EIO_PENDING;
if (bp)
bp->b_resid = xs->resid;
if (sense->error_code & SSD_ERRCODE_VALID &&
(xs->xs_control & XS_CTL_SILENT) == 0)
printf("%s: block wrong size, %d blocks "
"residual\n", st->sc_dev.dv_xname, info);
/*
* This quirk code helps the drive read
* the first tape block, regardless of
* format. That is required for these
* drives to return proper MODE SENSE
* information.
*/
if ((st->quirks & ST_Q_SENSE_HELP) &&
(periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)
st->blksize -= 512;
}
/*
* If data wanted and no data was tranfered, do it immediatly
*/
if (xs->datalen && xs->resid >= xs->datalen) {
if (st->flags & ST_EIO_PENDING)
return (EIO);
if (st->flags & ST_AT_FILEMARK) {
if (bp)
bp->b_resid = xs->resid;
return (0);
}
}
} else { /* must be variable mode */
if (sense->flags & SSD_EOM) {
/*
* The current semantics of this
* driver requires EOM detection
* to return EIO unless early
* warning detection is enabled
* for variable mode (this is always
* on for fixed block mode).
*/
if (st->flags & ST_EARLYWARN) {
st->flags |= ST_EOM_PENDING;
retval = 0;
} else {
retval = EIO;
}
/*
* If it's an unadorned EOM detection,
* suppress printing an error.
*/
if (key == SKEY_NO_SENSE) {
doprint = 0;
}
} else if (sense->flags & SSD_FILEMARK) {
retval = 0;
} else if (sense->flags & SSD_ILI) {
if (info < 0) {
/*
* The tape record was bigger than the read
* we issued.
*/
if ((xs->xs_control & XS_CTL_SILENT) == 0) {
printf("%s: %d-byte tape record too big"
" for %d-byte user buffer\n",
st->sc_dev.dv_xname,
xs->datalen - info, xs->datalen);
}
retval = EIO;
} else {
retval = 0;
}
}
xs->resid = info;
if (bp)
bp->b_resid = info;
}
#ifndef SCSIPI_DEBUG
if (retval == 0 && key == SKEY_NO_SENSE)
doprint = 0;
#endif
if (key == SKEY_BLANK_CHECK) {
/*
* This quirk code helps the drive read the
* first tape block, regardless of format. That
* is required for these drives to return proper
* MODE SENSE information.
*/
if ((st->quirks & ST_Q_SENSE_HELP) &&
(periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
/* still starting */
st->blksize -= 512;
} else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) {
st->flags |= ST_BLANK_READ;
xs->resid = xs->datalen;
if (bp) {
bp->b_resid = xs->resid;
/* return an EOF */
}
retval = 0;
}
}
/*
* If generic sense processing will continue, we should not
* print sense info here.
*/
if (retval == EJUSTRETURN)
doprint = 0;
if (doprint) {
#ifdef SCSIVERBOSE
scsipi_print_sense(xs, 0);
#else
scsipi_printaddr(periph);
printf("Sense Key 0x%02x", key);
if ((sense->error_code & SSD_ERRCODE_VALID) != 0) {
switch (key) {
case SKEY_NOT_READY:
case SKEY_ILLEGAL_REQUEST:
case SKEY_UNIT_ATTENTION:
case SKEY_WRITE_PROTECT:
break;
case SKEY_BLANK_CHECK:
printf(", requested size: %d (decimal)", info);
break;
case SKEY_ABORTED_COMMAND:
if (xs->xs_retries)
printf(", retrying");
printf(", cmd 0x%x, info 0x%x",
xs->cmd->opcode, info);
break;
default:
printf(", info = %d (decimal)", info);
}
}
if (sense->extra_len != 0) {
int n;
printf(", data =");
for (n = 0; n < sense->extra_len; n++)
printf(" %02x", sense->cmd_spec_info[n]);
}
printf("\n");
#endif
}
return (retval);
}
/*
* The quirk here is that the drive returns some value to st_mode_sense
* incorrectly until the tape has actually passed by the head.
*
* The method is to set the drive to large fixed-block state (user-specified
* density and 1024-byte blocks), then read and rewind to get it to sense the
* tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't
* work, as a last resort, try variable- length blocks. The result will be
* the ability to do an accurate st_mode_sense.
*
* We know we can do a rewind because we just did a load, which implies rewind.
* Rewind seems preferable to space backward if we have a virgin tape.
*
* The rest of the code for this quirk is in ILI processing and BLANK CHECK
* error processing, both part of st_interpret_sense.
*/
int
st_touch_tape(st)
struct st_softc *st;
{
char *buf;
int readsize;
int error;
buf = malloc(1024, M_TEMP, M_NOWAIT);
if (buf == NULL)
return (ENOMEM);
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:
case 1024:
readsize = st->blksize;
st->flags |= ST_FIXEDBLOCKS;
break;
default:
readsize = 1;
st->flags &= ~ST_FIXEDBLOCKS;
}
if ((error = st_mode_select(st, XS_CTL_SILENT)) != 0) {
/*
* The device did not agree with the proposed
* block size. If we exhausted our options,
* return failure, else try another.
*/
if (readsize == 1)
goto bad;
st->blksize -= 512;
continue;
}
st_read(st, buf, readsize, XS_CTL_SILENT); /* XXX */
if ((error = st_rewind(st, 0, 0)) != 0) {
bad: free(buf, M_TEMP);
return (error);
}
} while (readsize != 1 && readsize > st->blksize);
free(buf, M_TEMP);
return (0);
}
int
stdump(dev, blkno, va, size)
dev_t dev;
daddr_t blkno;
caddr_t va;
size_t size;
{
/* Not implemented. */
return (ENXIO);
}
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