File: [local] / src / sys / scsi / st.c (download)
Revision 1.190, Thu Apr 27 18:21:44 2023 UTC (13 months, 2 weeks ago) by robert
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, HEAD
Changes since 1.189: +27 -1 lines
add support for I/O statistics so that tape speeds can be observed with
iostat(8)
|
/* $OpenBSD: st.c,v 1.190 2023/04/27 18:21:44 robert Exp $ */
/* $NetBSD: st.c,v 1.71 1997/02/21 23:03:49 thorpej Exp $ */
/*
* Copyright (c) 1994 Charles Hannum. All rights reserved.
*
* 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 Charles Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
*/
/*
* To do:
* work out some better way of guessing what a good timeout is going
* to be depending on whether we expect to retension or not.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <sys/fcntl.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/pool.h>
#include <sys/buf.h>
#include <sys/mtio.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_debug.h>
#include <scsi/scsi_tape.h>
#include <scsi/scsiconf.h>
/* Defines for device specific stuff */
#define DEF_FIXED_BSIZE 512
#define STMODE(z) ( minor(z) & 0x03)
#define STUNIT(z) ((minor(z) >> 4) )
#define STMINOR(unit, mode) (((unit) << 4) + (mode))
#define MAXSTMODES 16 /* Old max retained so minor's don't change. */
#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 */
/*
* Maximum density code allowed in SCSI spec (SSC2R08f, Section 8.3).
*/
#define SCSI_MAX_DENSITY_CODE 0xff
/*
* Define various devices that we know mis-behave in some way,
* and note how they are bad, so we can correct for them
*/
struct mode {
int blksize;
u_int8_t density;
};
struct quirkdata {
u_int quirks;
#define ST_Q_SENSE_HELP 0x0001 /* must do READ for good MODE SENSE */
#define ST_Q_IGNORE_LOADS 0x0002
#define ST_Q_UNIMODAL 0x0004 /* unimode drive rejects mode select */
struct mode mode;
};
struct st_quirk_inquiry_pattern {
struct scsi_inquiry_pattern pattern;
struct quirkdata quirkdata;
};
const struct st_quirk_inquiry_pattern st_quirk_patterns[] = {
{{T_SEQUENTIAL, T_REMOV,
" ", " ", " "}, {0,
{512, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"TANDBERG", " TDC 3800 ", ""}, {0,
{512, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"ARCHIVE ", "VIPER 2525 25462", ""}, {ST_Q_SENSE_HELP,
{0, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"SANKYO ", "CP525 ", ""}, {0,
{512, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"ANRITSU ", "DMT780 ", ""}, {0,
{512, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"ARCHIVE ", "VIPER 150 21531", ""}, {ST_Q_SENSE_HELP,
{0, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"WANGTEK ", "5099ES SCSI", ""}, {0,
{512, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"WANGTEK ", "5150ES SCSI", ""}, {0,
{512, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"HP ", "T4000s ", ""}, {ST_Q_UNIMODAL,
{0, QIC_3095}}},
{{T_SEQUENTIAL, T_REMOV,
"WANGTEK ", "5150ES SCSI FA15", "01 A"}, {ST_Q_IGNORE_LOADS,
{0, 0}}},
{{T_SEQUENTIAL, T_REMOV,
"TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS,
{0, 0}}},
};
#define NOEJECT 0
#define EJECT 1
#define NOREWIND 0
#define DOREWIND 1
struct st_softc {
struct device sc_dev;
struct disk sc_dk;
int flags;
#define ST_INFO_VALID 0x00000001
#define ST_WRITTEN 0x00000004
#define ST_FIXEDBLOCKS 0x00000008
#define ST_AT_FILEMARK 0x00000010
#define ST_EIO_PENDING 0x00000020
#define ST_EOM_PENDING 0x00000040
#define ST_EOD_DETECTED 0x00000080
#define ST_FM_WRITTEN 0x00000100
#define ST_BLANK_READ 0x00000200
#define ST_2FM_AT_EOD 0x00000400
#define ST_MOUNTED 0x00000800
#define ST_DONTBUFFER 0x00001000
#define ST_DYING 0x00004000
#define ST_BOD_DETECTED 0x00008000
#define ST_MODE_DENSITY 0x00010000
#define ST_MODE_BLKSIZE 0x00040000
u_int quirks; /* quirks for the open mode */
int blksize; /* blksize we are using */
u_int8_t density; /* present density */
short mt_resid; /* last (short) resid */
short mt_erreg; /* last error (sense key) seen */
struct scsi_link *sc_link; /* our link to the adapter etc. */
int blkmin; /* min blk size */
int blkmax; /* max blk size */
u_int32_t media_blksize; /* 0 if not ST_FIXEDBLOCKS */
u_int32_t media_density; /* this is what it said when asked */
int media_fileno; /* relative to BOT. -1 means unknown. */
int media_blkno; /* relative to BOF. -1 means unknown. */
int media_eom; /* relative to BOT. -1 means unknown. */
struct mode mode;
struct bufq sc_bufq;
struct scsi_xshandler sc_xsh;
};
int stmatch(struct device *, void *, void *);
void stattach(struct device *, struct device *, void *);
int stactivate(struct device *, int);
int stdetach(struct device *, int);
void stminphys(struct buf *);
void ststart(struct scsi_xfer *);
int st_mount_tape(struct st_softc *, int);
void st_unmount(struct st_softc *, int, int);
int st_decide_mode(struct st_softc *, int);
void st_buf_done(struct scsi_xfer *);
int st_read(struct st_softc *, char *, int, int);
int st_read_block_limits(struct st_softc *, int);
int st_mode_sense(struct st_softc *, int);
int st_mode_select(struct st_softc *, int);
int st_space(struct st_softc *, int, u_int, int);
int st_write_filemarks(struct st_softc *, int, int);
int st_check_eod(struct st_softc *, int, int *, int);
int st_load(struct st_softc *, u_int, int);
int st_rewind(struct st_softc *, u_int, int);
int st_interpret_sense(struct scsi_xfer *);
int st_touch_tape(struct st_softc *);
int st_erase(struct st_softc *, int, int);
const struct cfattach st_ca = {
sizeof(struct st_softc), stmatch, stattach,
stdetach, stactivate
};
struct cfdriver st_cd = {
NULL, "st", DV_TAPE
};
#define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_EOM_PENDING | \
ST_BLANK_READ)
#define stlookup(unit) (struct st_softc *)device_lookup(&st_cd, (unit))
const struct scsi_inquiry_pattern st_patterns[] = {
{T_SEQUENTIAL, T_REMOV,
"", "", ""},
};
int
stmatch(struct device *parent, void *match, void *aux)
{
struct scsi_attach_args *sa = aux;
struct scsi_inquiry_data *inq = &sa->sa_sc_link->inqdata;
int priority;
(void)scsi_inqmatch(inq, st_patterns, nitems(st_patterns),
sizeof(st_patterns[0]), &priority);
return priority;
}
/*
* The routine called by the low level scsi routine when it discovers
* a device suitable for this driver.
*/
void
stattach(struct device *parent, struct device *self, void *aux)
{
const struct st_quirk_inquiry_pattern *finger;
struct st_softc *st = (void *)self;
struct scsi_attach_args *sa = aux;
struct scsi_link *link = sa->sa_sc_link;
int priority;
SC_DEBUG(link, SDEV_DB2, ("stattach:\n"));
/*
* Store information needed to contact our base driver
*/
st->sc_link = link;
link->interpret_sense = st_interpret_sense;
link->device_softc = st;
/* Get any quirks and mode information. */
finger = (const struct st_quirk_inquiry_pattern *)scsi_inqmatch(
&link->inqdata,
st_quirk_patterns,
nitems(st_quirk_patterns),
sizeof(st_quirk_patterns[0]), &priority);
if (finger != NULL) {
st->quirks = finger->quirkdata.quirks;
st->mode = finger->quirkdata.mode;
CLR(st->flags, ST_MODE_BLKSIZE | ST_MODE_DENSITY);
if (st->mode.blksize != 0)
SET(st->flags, ST_MODE_BLKSIZE);
if (st->mode.density != 0)
SET(st->flags, ST_MODE_DENSITY);
}
printf("\n");
scsi_xsh_set(&st->sc_xsh, link, ststart);
st->sc_dk.dk_name = st->sc_dev.dv_xname;
/* Set up the buf queue for this device. */
bufq_init(&st->sc_bufq, BUFQ_FIFO);
/* Start up with media position unknown. */
st->media_fileno = -1;
st->media_blkno = -1;
st->media_eom = -1;
/*
* Reset the media loaded flag, sometimes the data
* acquired at boot time is not quite accurate. This
* will be checked again at the first open.
*/
CLR(link->flags, SDEV_MEDIA_LOADED);
st->sc_dk.dk_flags = DKF_NOLABELREAD;
disk_attach(&st->sc_dev, &st->sc_dk);
}
int
stactivate(struct device *self, int act)
{
struct st_softc *st = (struct st_softc *)self;
switch (act) {
case DVACT_DEACTIVATE:
SET(st->flags, ST_DYING);
scsi_xsh_del(&st->sc_xsh);
break;
}
return 0;
}
int
stdetach(struct device *self, int flags)
{
struct st_softc *st = (struct st_softc *)self;
int cmaj, mn;
bufq_drain(&st->sc_bufq);
/* Locate the lowest minor number to be detached. */
mn = STMINOR(self->dv_unit, 0);
for (cmaj = 0; cmaj < nchrdev; cmaj++)
if (cdevsw[cmaj].d_open == stopen)
vdevgone(cmaj, mn, mn + MAXSTMODES - 1, VCHR);
bufq_destroy(&st->sc_bufq);
disk_detach(&st->sc_dk);
return 0;
}
/*
* open the device.
*/
int
stopen(dev_t dev, int flags, int fmt, struct proc *p)
{
struct scsi_link *link;
struct st_softc *st;
int error = 0;
st = stlookup(STUNIT(dev));
if (st == NULL)
return ENXIO;
if (ISSET(st->flags, ST_DYING)) {
device_unref(&st->sc_dev);
return ENXIO;
}
link = st->sc_link;
if ((error = disk_lock(&st->sc_dk)) != 0) {
device_unref(&st->sc_dev);
return error;
}
if (ISSET(flags, FWRITE) && ISSET(link->flags, SDEV_READONLY)) {
error = EACCES;
goto done;
}
SC_DEBUG(link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev,
STUNIT(dev), st_cd.cd_ndevs));
/*
* Tape is an exclusive media. Only one open at a time.
*/
if (ISSET(link->flags, SDEV_OPEN)) {
SC_DEBUG(link, SDEV_DB4, ("already open\n"));
error = EBUSY;
goto done;
}
/* Use st_interpret_sense() now. */
SET(link->flags, SDEV_OPEN);
/*
* Check the unit status. This clears any outstanding errors and
* will ensure that media is present.
*/
error = scsi_test_unit_ready(link, TEST_READY_RETRIES,
SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE |
SCSI_IGNORE_ILLEGAL_REQUEST);
/*
* Terminate any existing mount session if there is no media.
*/
if (!ISSET(link->flags, SDEV_MEDIA_LOADED))
st_unmount(st, NOEJECT, DOREWIND);
if (error != 0) {
CLR(link->flags, SDEV_OPEN);
goto done;
}
error = st_mount_tape(st, flags);
if (error != 0) {
CLR(link->flags, SDEV_OPEN);
goto done;
}
/*
* 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
*/
if ((flags & O_ACCMODE) == FWRITE)
SET(st->flags, ST_WRITTEN);
done:
SC_DEBUG(link, SDEV_DB2, ("open complete\n"));
disk_unlock(&st->sc_dk);
device_unref(&st->sc_dev);
return error;
}
/*
* close the device.. only called if we are the LAST
* occurrence of an open device
*/
int
stclose(dev_t dev, int flags, int mode, struct proc *p)
{
struct scsi_link *link;
struct st_softc *st;
int error = 0;
st = stlookup(STUNIT(dev));
if (st == NULL)
return ENXIO;
if (ISSET(st->flags, ST_DYING)) {
error = ENXIO;
goto done;
}
link = st->sc_link;
disk_lock_nointr(&st->sc_dk);
SC_DEBUG(link, SDEV_DB1, ("closing\n"));
if (ISSET(st->flags, ST_WRITTEN) && !ISSET(st->flags, ST_FM_WRITTEN))
st_write_filemarks(st, 1, 0);
switch (STMODE(dev)) {
case 0: /* /dev/rstN */
st_unmount(st, NOEJECT, DOREWIND);
break;
case 1: /* /dev/nrstN */
st_unmount(st, NOEJECT, NOREWIND);
break;
case 2: /* /dev/erstN */
st_unmount(st, EJECT, DOREWIND);
break;
case 3: /* /dev/enrstN */
st_unmount(st, EJECT, NOREWIND);
break;
}
CLR(link->flags, SDEV_OPEN);
scsi_xsh_del(&st->sc_xsh);
disk_unlock(&st->sc_dk);
done:
device_unref(&st->sc_dev);
return error;
}
/*
* Start a new mount session if needed.
*/
int
st_mount_tape(struct st_softc *st, int flags)
{
struct scsi_link *link = st->sc_link;
int error = 0;
if (ISSET(st->flags, ST_MOUNTED))
return 0;
SC_DEBUG(link, SDEV_DB1, ("mounting\n"));
/*
* Assume the media is new and give it a chance to
* to do a 'load' instruction.
*/
if ((error = st_load(st, LD_LOAD, 0)) != 0)
goto done;
/*
* Throw another dummy instruction to catch
* 'Unit attention' errors. Some drives appear to give
* these after doing a Load instruction.
* (notably some DAT drives)
*/
/* XXX */
scsi_test_unit_ready(link, TEST_READY_RETRIES, SCSI_SILENT);
/*
* Some devices can't tell you much until they have been
* asked to look at the media. This quirk does this.
*/
if (ISSET(st->quirks, ST_Q_SENSE_HELP))
if ((error = st_touch_tape(st)) != 0)
return error;
/*
* Load the physical device parameters
* loads: blkmin, blkmax
*/
if (!ISSET(link->flags, SDEV_ATAPI) &&
(error = st_read_block_limits(st, 0)) != 0)
goto done;
/*
* Load the media dependent parameters
* includes: media_blksize,media_density
* 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)
goto done;
/*
* If we have gained a permanent density from somewhere,
* then use it in preference to the one supplied by
* default by the driver.
*/
if (ISSET(st->flags, ST_MODE_DENSITY))
st->density = st->mode.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.
*/
CLR(st->flags, ST_FIXEDBLOCKS);
if (ISSET(st->flags, ST_MODE_BLKSIZE)) {
st->blksize = st->mode.blksize;
if (st->blksize)
SET(st->flags, ST_FIXEDBLOCKS);
} else {
if ((error = st_decide_mode(st, 0)) != 0)
goto done;
}
if ((error = st_mode_select(st, 0)) != 0) {
printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname);
goto done;
}
scsi_prevent(link, PR_PREVENT,
SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY);
SET(st->flags, ST_MOUNTED);
SET(link->flags, SDEV_MEDIA_LOADED); /* move earlier? */
st->media_fileno = 0;
st->media_blkno = 0;
st->media_eom = -1;
done:
return error;
}
/*
* 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(struct st_softc *st, int eject, int rewind)
{
struct scsi_link *link = st->sc_link;
int nmarks;
if (eject == NOEJECT && rewind == NOREWIND) {
if (ISSET(link->flags, SDEV_MEDIA_LOADED))
return;
}
st->media_fileno = -1;
st->media_blkno = -1;
if (!ISSET(st->flags, ST_MOUNTED))
return;
SC_DEBUG(link, SDEV_DB1, ("unmounting\n"));
st_check_eod(st, 0, &nmarks, SCSI_IGNORE_NOT_READY);
if (rewind == DOREWIND)
st_rewind(st, 0, SCSI_IGNORE_NOT_READY);
scsi_prevent(link, PR_ALLOW,
SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY);
if (eject == EJECT)
st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY);
CLR(st->flags, ST_MOUNTED);
CLR(link->flags, SDEV_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(struct st_softc *st, int first_read)
{
struct scsi_link *link = st->sc_link;
SC_DEBUG(link, SDEV_DB2, ("starting block mode decision\n"));
/* ATAPI tapes are always fixed blocksize. */
if (ISSET(link->flags, SDEV_ATAPI)) {
SET(st->flags, ST_FIXEDBLOCKS);
if (st->media_blksize > 0)
st->blksize = st->media_blksize;
else
st->blksize = DEF_FIXED_BSIZE;
goto done;
}
/*
* 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)) {
SET(st->flags, ST_FIXEDBLOCKS);
st->blksize = st->blkmin;
SC_DEBUG(link, SDEV_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:
CLR(st->flags, ST_FIXEDBLOCKS);
st->blksize = 0;
SC_DEBUG(link, SDEV_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:
SET(st->flags, ST_FIXEDBLOCKS);
if (st->media_blksize > 0)
st->blksize = st->media_blksize;
else
st->blksize = DEF_FIXED_BSIZE;
SC_DEBUG(link, SDEV_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) {
if (st->media_blksize > 0)
SET(st->flags, ST_FIXEDBLOCKS);
else
CLR(st->flags, ST_FIXEDBLOCKS);
st->blksize = st->media_blksize;
SC_DEBUG(link, SDEV_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.
*/
CLR(st->flags, ST_FIXEDBLOCKS);
st->blksize = 0;
SC_DEBUG(link, SDEV_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:
CLR(st->flags, ST_2FM_AT_EOD);
break;
default:
SET(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(struct buf *bp)
{
struct scsi_link *link;
struct st_softc *st;
int s;
st = stlookup(STUNIT(bp->b_dev));
if (st == NULL) {
bp->b_error = ENXIO;
goto bad;
}
if (ISSET(st->flags, ST_DYING)) {
bp->b_error = ENXIO;
goto bad;
}
link = st->sc_link;
SC_DEBUG(link, SDEV_DB2, ("ststrategy: %ld bytes @ blk %lld\n",
bp->b_bcount, (long long)bp->b_blkno));
/*
* If it's a null transfer, return immediately.
*/
if (bp->b_bcount == 0)
goto done;
/*
* Odd sized request on fixed drives are verboten
*/
if (ISSET(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;
}
/*
* 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_queue(&st->sc_bufq, 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..)
*/
scsi_xsh_add(&st->sc_xsh);
device_unref(&st->sc_dev);
return;
bad:
SET(bp->b_flags, B_ERROR);
done:
/* Set b_resid to indicate no xfer was done. */
bp->b_resid = bp->b_bcount;
s = splbio();
biodone(bp);
splx(s);
if (st)
device_unref(&st->sc_dev);
}
void
ststart(struct scsi_xfer *xs)
{
struct scsi_link *link = xs->sc_link;
struct st_softc *st = link->device_softc;
struct buf *bp;
struct scsi_rw_tape *cmd;
int s;
SC_DEBUG(link, SDEV_DB2, ("ststart\n"));
if (ISSET(st->flags, ST_DYING)) {
scsi_xs_put(xs);
return;
}
/*
* if the device has been unmounted by the user
* then throw away all requests until done
*/
if (!ISSET(st->flags, ST_MOUNTED) ||
!ISSET(link->flags, SDEV_MEDIA_LOADED)) {
/* make sure that one implies the other.. */
CLR(link->flags, SDEV_MEDIA_LOADED);
bufq_drain(&st->sc_bufq);
scsi_xs_put(xs);
return;
}
for (;;) {
bp = bufq_dequeue(&st->sc_bufq);
if (bp == NULL) {
scsi_xs_put(xs);
return;
}
/*
* Only FIXEDBLOCK devices have pending I/O or space
* operations.
*/
if (ISSET(st->flags, ST_FIXEDBLOCKS)) {
/*
* If we are at a filemark but have not reported it yet
* then we should report it now
*/
if (ISSET(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)) {
SET(bp->b_flags, B_ERROR);
bp->b_resid = bp->b_bcount;
bp->b_error = EIO;
s = splbio();
biodone(bp);
splx(s);
continue;
}
} else {
bp->b_resid = bp->b_bcount;
bp->b_error = 0;
CLR(bp->b_flags, B_ERROR);
CLR(st->flags, ST_AT_FILEMARK);
s = splbio();
biodone(bp);
splx(s);
continue; /* seek more work */
}
}
}
/*
* If we are at EIO or EOM but have not reported it
* yet then we should report it now.
*/
if (ISSET(st->flags, ST_EOM_PENDING | ST_EIO_PENDING)) {
bp->b_resid = bp->b_bcount;
if (ISSET(st->flags, ST_EIO_PENDING)) {
bp->b_error = EIO;
SET(bp->b_flags, B_ERROR);
}
CLR(st->flags, ST_EOM_PENDING | ST_EIO_PENDING);
s = splbio();
biodone(bp);
splx(s);
continue; /* seek more work */
}
break;
}
/*
* Fill out the scsi command
*/
cmd = (struct scsi_rw_tape *)&xs->cmd;
bzero(cmd, sizeof(*cmd));
if ((bp->b_flags & B_READ) == B_WRITE) {
cmd->opcode = WRITE;
CLR(st->flags, ST_FM_WRITTEN);
SET(st->flags, ST_WRITTEN);
SET(xs->flags, SCSI_DATA_OUT);
} else {
cmd->opcode = READ;
SET(xs->flags, SCSI_DATA_IN);
}
/*
* Handle "fixed-block-mode" tape drives by using the
* block count instead of the length.
*/
if (ISSET(st->flags, ST_FIXEDBLOCKS)) {
SET(cmd->byte2, SRW_FIXED);
_lto3b(bp->b_bcount / st->blksize, cmd->len);
} else
_lto3b(bp->b_bcount, cmd->len);
if (st->media_blkno != -1) {
/* Update block count now, errors will set it to -1. */
if (ISSET(st->flags, ST_FIXEDBLOCKS))
st->media_blkno += _3btol(cmd->len);
else if (_3btol(cmd->len) != 0)
st->media_blkno++;
}
xs->cmdlen = sizeof(*cmd);
xs->timeout = ST_IO_TIME;
xs->data = bp->b_data;
xs->datalen = bp->b_bcount;
xs->done = st_buf_done;
xs->cookie = bp;
xs->bp = bp;
/* Instrumentation. */
disk_busy(&st->sc_dk);
/*
* go ask the adapter to do all this for us
*/
scsi_xs_exec(xs);
/*
* should we try do more work now?
*/
if (bufq_peek(&st->sc_bufq))
scsi_xsh_add(&st->sc_xsh);
}
void
st_buf_done(struct scsi_xfer *xs)
{
struct st_softc *st = xs->sc_link->device_softc;
struct buf *bp = xs->cookie;
int error, s;
switch (xs->error) {
case XS_NOERROR:
bp->b_error = 0;
CLR(bp->b_flags, B_ERROR);
bp->b_resid = xs->resid;
break;
case XS_SENSE:
case XS_SHORTSENSE:
SC_DEBUG_SENSE(xs);
error = st_interpret_sense(xs);
if (error == 0) {
bp->b_error = 0;
CLR(bp->b_flags, B_ERROR);
bp->b_resid = xs->resid;
break;
}
if (error != ERESTART)
xs->retries = 0;
goto retry;
case XS_BUSY:
if (xs->retries) {
if (scsi_delay(xs, 1) != ERESTART)
xs->retries = 0;
}
goto retry;
case XS_TIMEOUT:
retry:
if (xs->retries--) {
scsi_xs_exec(xs);
return;
}
/* FALLTHROUGH */
default:
bp->b_error = EIO;
SET(bp->b_flags, B_ERROR);
bp->b_resid = bp->b_bcount;
break;
}
disk_unbusy(&st->sc_dk, bp->b_bcount - xs->resid, bp->b_blkno,
bp->b_flags & B_READ);
s = splbio();
biodone(bp);
splx(s);
scsi_xs_put(xs);
}
void
stminphys(struct buf *bp)
{
struct scsi_link *link;
struct st_softc *sc;
sc = stlookup(STUNIT(bp->b_dev));
if (sc == NULL)
return;
link = sc->sc_link;
if (link->bus->sb_adapter->dev_minphys != NULL)
(*link->bus->sb_adapter->dev_minphys)(bp, link);
else
minphys(bp);
device_unref(&sc->sc_dev);
}
int
stread(dev_t dev, struct uio *uio, int iomode)
{
return physio(ststrategy, dev, B_READ, stminphys, uio);
}
int
stwrite(dev_t dev, struct uio *uio, int iomode)
{
return physio(ststrategy, dev, B_WRITE, stminphys, uio);
}
/*
* Perform special action on behalf of the user;
* knows about the internals of this device
*/
int
stioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct proc *p)
{
int error = 0;
int nmarks;
int flags = 0;
struct st_softc *st;
int hold_blksize;
u_int8_t hold_density;
struct mtop *mt = (struct mtop *) arg;
int number;
/*
* Find the device that the user is talking about
*/
st = stlookup(STUNIT(dev));
if (st == NULL)
return ENXIO;
if (ISSET(st->flags, ST_DYING)) {
error = ENXIO;
goto done;
}
hold_blksize = st->blksize;
hold_density = st->density;
switch (cmd) {
case MTIOCGET: {
struct mtget *g = (struct mtget *) arg;
/*
* (to get the current state of READONLY)
*/
error = st_mode_sense(st, SCSI_SILENT);
if (error != 0)
break;
SC_DEBUG(st->sc_link, SDEV_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 = st->mode.blksize;
g->mt_mdensity = st->mode.density;
if (ISSET(st->sc_link->flags, SDEV_READONLY))
SET(g->mt_dsreg, MT_DS_RDONLY);
if (ISSET(st->flags, ST_MOUNTED))
SET(g->mt_dsreg, MT_DS_MOUNTED);
g->mt_resid = st->mt_resid;
g->mt_erreg = st->mt_erreg;
g->mt_fileno = st->media_fileno;
g->mt_blkno = st->media_blkno;
/*
* clear latched errors.
*/
st->mt_resid = 0;
st->mt_erreg = 0;
break;
}
case MTIOCTOP: {
SC_DEBUG(st->sc_link, SDEV_DB1,
("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count));
number = mt->mt_count;
switch (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, 0, &nmarks, flags);
if (error == 0)
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, 1, &nmarks, flags);
if (error == 0)
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, DOREWIND);
break;
case MTNOP: /* no operation, sets status only */
break;
case MTRETEN: /* retension the tape */
error = st_load(st, LD_RETENSION, flags);
if (error == 0)
error = st_load(st, LD_LOAD, flags);
break;
case MTEOM: /* forward space to end of media */
error = st_check_eod(st, 0, &nmarks, flags);
if (error == 0)
error = st_space(st, 1, SP_EOM, flags);
break;
case MTCACHE: /* enable controller cache */
CLR(st->flags, ST_DONTBUFFER);
goto try_new_value;
case MTNOCACHE: /* disable controller cache */
SET(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 and mode. */
if (number == 0) {
CLR(st->flags, ST_FIXEDBLOCKS);
} else {
if ((st->blkmin || st->blkmax) &&
(number < st->blkmin ||
number > st->blkmax)) {
error = EINVAL;
break;
}
SET(st->flags, ST_FIXEDBLOCKS);
}
st->blksize = number;
goto try_new_value;
case MTSETDNSTY: /* Set density for device and mode. */
if (number < 0 || number > SCSI_MAX_DENSITY_CODE) {
error = EINVAL;
break;
}
st->density = number;
goto try_new_value;
default:
error = EINVAL;
}
break;
}
case MTIOCIEOT:
case MTIOCEEOT:
break;
#if 0
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;
#endif /* 0 */
default:
error = scsi_do_ioctl(st->sc_link, cmd, arg, flag);
break;
}
goto done;
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 ((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)
SET(st->flags, ST_FIXEDBLOCKS);
else
CLR(st->flags, ST_FIXEDBLOCKS);
goto done;
}
/*
* As the drive liked it, if we are setting a new default,
* set it into the structures as such.
*/
switch (mt->mt_op) {
case MTSETBSIZ:
st->mode.blksize = st->blksize;
SET(st->flags, ST_MODE_BLKSIZE);
break;
case MTSETDNSTY:
st->mode.density = st->density;
SET(st->flags, ST_MODE_DENSITY);
break;
}
done:
device_unref(&st->sc_dev);
return error;
}
/*
* Do a synchronous read.
*/
int
st_read(struct st_softc *st, char *buf, int size, int flags)
{
struct scsi_rw_tape *cmd;
struct scsi_xfer *xs;
int error;
if (size == 0)
return 0;
xs = scsi_xs_get(st->sc_link, flags | SCSI_DATA_IN);
if (xs == NULL)
return ENOMEM;
xs->cmdlen = sizeof(*cmd);
xs->data = buf;
xs->datalen = size;
xs->retries = 0;
xs->timeout = ST_IO_TIME;
cmd = (struct scsi_rw_tape *)&xs->cmd;
cmd->opcode = READ;
if (ISSET(st->flags, ST_FIXEDBLOCKS)) {
SET(cmd->byte2, SRW_FIXED);
_lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE),
cmd->len);
} else
_lto3b(size, cmd->len);
error = scsi_xs_sync(xs);
scsi_xs_put(xs);
return error;
}
/*
* Ask the drive what its min and max blk sizes are.
*/
int
st_read_block_limits(struct st_softc *st, int flags)
{
struct scsi_block_limits_data *block_limits = NULL;
struct scsi_block_limits *cmd;
struct scsi_link *link = st->sc_link;
struct scsi_xfer *xs;
int error = 0;
if (ISSET(link->flags, SDEV_MEDIA_LOADED))
return 0;
block_limits = dma_alloc(sizeof(*block_limits), PR_NOWAIT);
if (block_limits == NULL)
return ENOMEM;
xs = scsi_xs_get(link, flags | SCSI_DATA_IN);
if (xs == NULL) {
error = ENOMEM;
goto done;
}
xs->cmdlen = sizeof(*cmd);
xs->data = (void *)block_limits;
xs->datalen = sizeof(*block_limits);
xs->timeout = ST_CTL_TIME;
cmd = (struct scsi_block_limits *)&xs->cmd;
cmd->opcode = READ_BLOCK_LIMITS;
error = scsi_xs_sync(xs);
scsi_xs_put(xs);
if (error == 0) {
st->blkmin = _2btol(block_limits->min_length);
st->blkmax = _3btol(block_limits->max_length);
SC_DEBUG(link, SDEV_DB3,
("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax));
}
done:
if (block_limits)
dma_free(block_limits, sizeof(*block_limits));
return error;
}
/*
* 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(struct st_softc *st, int flags)
{
union scsi_mode_sense_buf *data = NULL;
struct scsi_link *link = st->sc_link;
u_int64_t block_count;
u_int32_t density, block_size;
u_char *page0 = NULL;
u_int8_t dev_spec;
int error = 0, big;
data = dma_alloc(sizeof(*data), PR_NOWAIT);
if (data == NULL)
return ENOMEM;
/*
* Ask for page 0 (vendor specific) mode sense data.
*/
density = 0;
block_count = 0;
block_size = 0;
error = scsi_do_mode_sense(link, 0, data, (void **)&page0, 1,
flags | SCSI_SILENT, &big);
if (error != 0)
goto done;
scsi_parse_blkdesc(link, data, big, &density, &block_count,
&block_size);
/* It is valid for no page0 to be available. */
if (big)
dev_spec = data->hdr_big.dev_spec;
else
dev_spec = data->hdr.dev_spec;
if (ISSET(dev_spec, SMH_DSP_WRITE_PROT))
SET(link->flags, SDEV_READONLY);
else
CLR(link->flags, SDEV_READONLY);
st->media_blksize = block_size;
st->media_density = density;
SC_DEBUG(link, SDEV_DB3,
("density code 0x%x, %d-byte blocks, write-%s, %sbuffered\n",
st->media_density, st->media_blksize,
ISSET(link->flags, SDEV_READONLY) ? "protected" : "enabled",
ISSET(dev_spec, SMH_DSP_BUFF_MODE) ? "" : "un"));
SET(link->flags, SDEV_MEDIA_LOADED);
done:
if (data)
dma_free(data, sizeof(*data));
return error;
}
/*
* Send a filled out parameter structure to the drive to
* set it into the desire mode etc.
*/
int
st_mode_select(struct st_softc *st, int flags)
{
union scsi_mode_sense_buf *inbuf = NULL, *outbuf = NULL;
struct scsi_blk_desc general;
struct scsi_link *link = st->sc_link;
u_int8_t *page0 = NULL;
int error = 0, big, page0_size;
inbuf = dma_alloc(sizeof(*inbuf), PR_NOWAIT);
if (inbuf == NULL) {
error = ENOMEM;
goto done;
}
outbuf = dma_alloc(sizeof(*outbuf), PR_NOWAIT | PR_ZERO);
if (outbuf == NULL) {
error = ENOMEM;
goto done;
}
/*
* 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 (ISSET(st->quirks, ST_Q_UNIMODAL)) {
SC_DEBUG(link, SDEV_DB3,
("not setting density 0x%x blksize 0x%x\n",
st->density, st->blksize));
error = 0;
goto done;
}
if (ISSET(link->flags, SDEV_ATAPI)) {
error = 0;
goto done;
}
bzero(&general, sizeof(general));
general.density = st->density;
if (ISSET(st->flags, ST_FIXEDBLOCKS))
_lto3b(st->blksize, general.blklen);
/*
* Ask for page 0 (vendor specific) mode sense data.
*
* page0 == NULL is a valid situation.
*/
error = scsi_do_mode_sense(link, 0, inbuf, (void **)&page0, 1,
flags | SCSI_SILENT, &big);
if (error != 0)
goto done;
if (page0 == NULL) {
page0_size = 0;
} else if (big == 0) {
page0_size = inbuf->hdr.data_length +
sizeof(inbuf->hdr.data_length) - sizeof(inbuf->hdr) -
inbuf->hdr.blk_desc_len;
memcpy(&outbuf->buf[sizeof(outbuf->hdr)+ sizeof(general)],
page0, page0_size);
} else {
page0_size = _2btol(inbuf->hdr_big.data_length) +
sizeof(inbuf->hdr_big.data_length) -
sizeof(inbuf->hdr_big) -
_2btol(inbuf->hdr_big.blk_desc_len);
memcpy(&outbuf->buf[sizeof(outbuf->hdr_big) + sizeof(general)],
page0, page0_size);
}
/*
* Set up for a mode select.
*/
if (big == 0) {
outbuf->hdr.data_length = sizeof(outbuf->hdr) +
sizeof(general) + page0_size -
sizeof(outbuf->hdr.data_length);
if (!ISSET(st->flags, ST_DONTBUFFER))
outbuf->hdr.dev_spec = SMH_DSP_BUFF_MODE_ON;
outbuf->hdr.blk_desc_len = sizeof(general);
memcpy(&outbuf->buf[sizeof(outbuf->hdr)],
&general, sizeof(general));
error = scsi_mode_select(st->sc_link, 0, &outbuf->hdr,
flags, ST_CTL_TIME);
goto done;
}
/* MODE SENSE (10) header was returned, so use MODE SELECT (10). */
_lto2b((sizeof(outbuf->hdr_big) + sizeof(general) + page0_size -
sizeof(outbuf->hdr_big.data_length)), outbuf->hdr_big.data_length);
if (!ISSET(st->flags, ST_DONTBUFFER))
outbuf->hdr_big.dev_spec = SMH_DSP_BUFF_MODE_ON;
_lto2b(sizeof(general), outbuf->hdr_big.blk_desc_len);
memcpy(&outbuf->buf[sizeof(outbuf->hdr_big)], &general,
sizeof(general));
error = scsi_mode_select_big(st->sc_link, 0, &outbuf->hdr_big,
flags, ST_CTL_TIME);
done:
if (inbuf)
dma_free(inbuf, sizeof(*inbuf));
if (outbuf)
dma_free(outbuf, sizeof(*outbuf));
return error;
}
/*
* issue an erase command
*/
int
st_erase(struct st_softc *st, int full, int flags)
{
struct scsi_erase *cmd;
struct scsi_xfer *xs;
int error;
xs = scsi_xs_get(st->sc_link, flags);
if (xs == NULL)
return ENOMEM;
xs->cmdlen = sizeof(*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.
*/
cmd = (struct scsi_erase *)&xs->cmd;
cmd->opcode = ERASE;
if (full) {
cmd->byte2 = SE_IMMED|SE_LONG;
xs->timeout = ST_SPC_TIME;
} else {
cmd->byte2 = SE_IMMED;
xs->timeout = ST_IO_TIME;
}
/*
* XXX We always do this asynchronously, for now. How long should
* we wait if we want to (eventually) to it synchronously?
*/
error = scsi_xs_sync(xs);
scsi_xs_put(xs);
return error;
}
/*
* skip N blocks/filemarks/seq filemarks/eom
*/
int
st_space(struct st_softc *st, int number, u_int what, int flags)
{
struct scsi_space *cmd;
struct scsi_xfer *xs;
int error;
switch (what) {
case SP_BLKS:
if (ISSET(st->flags, ST_PER_ACTION)) {
if (number > 0) {
CLR(st->flags, ST_PER_ACTION);
return EIO;
} else if (number < 0) {
if (ISSET(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 != 0)
return error;
}
if (ISSET(st->flags, ST_BLANK_READ)) {
CLR(st->flags, ST_BLANK_READ);
return EIO;
}
CLR(st->flags, ST_EIO_PENDING | ST_EOM_PENDING);
}
}
break;
case SP_FILEMARKS:
if (ISSET(st->flags, ST_EIO_PENDING)) {
if (number > 0) {
/* pretend we just discovered the error */
CLR(st->flags, ST_EIO_PENDING);
return EIO;
} else if (number < 0) {
/* back away from the error */
CLR(st->flags, ST_EIO_PENDING);
}
}
if (ISSET(st->flags, ST_AT_FILEMARK)) {
CLR(st->flags, ST_AT_FILEMARK);
number--;
}
if (ISSET(st->flags, ST_BLANK_READ) && (number < 0)) {
/* back away from unwritten tape */
CLR(st->flags, ST_BLANK_READ);
number++; /* XXX dubious */
}
break;
case SP_EOM:
if (ISSET(st->flags, ST_EOM_PENDING)) {
/* We are already there. */
CLR(st->flags, ST_EOM_PENDING);
return 0;
}
if (ISSET(st->flags, ST_EIO_PENDING)) {
/* pretend we just discovered the error */
CLR(st->flags, ST_EIO_PENDING);
return EIO;
}
if (ISSET(st->flags, ST_AT_FILEMARK))
CLR(st->flags, ST_AT_FILEMARK);
break;
}
if (number == 0)
return 0;
xs = scsi_xs_get(st->sc_link, flags);
if (xs == NULL)
return ENOMEM;
cmd = (struct scsi_space *)&xs->cmd;
cmd->opcode = SPACE;
cmd->byte2 = what;
_lto3b(number, cmd->number);
xs->cmdlen = sizeof(*cmd);
xs->timeout = ST_SPC_TIME;
CLR(st->flags, ST_EOD_DETECTED);
error = scsi_xs_sync(xs);
scsi_xs_put(xs);
if (error != 0) {
st->media_fileno = -1;
st->media_blkno = -1;
} else {
switch (what) {
case SP_BLKS:
if (st->media_blkno != -1) {
st->media_blkno += number;
if (st->media_blkno < 0)
st->media_blkno = -1;
}
break;
case SP_FILEMARKS:
if (st->media_fileno != -1) {
if (!ISSET(st->flags, ST_EOD_DETECTED))
st->media_fileno += number;
if (st->media_fileno > st->media_eom)
st->media_eom = st->media_fileno;
st->media_blkno = 0;
}
break;
case SP_EOM:
if (st->media_eom != -1) {
st->media_fileno = st->media_eom;
st->media_blkno = 0;
} else {
st->media_fileno = -1;
st->media_blkno = -1;
}
break;
default:
st->media_fileno = -1;
st->media_blkno = -1;
break;
}
}
return error;
}
/*
* write N filemarks
*/
int
st_write_filemarks(struct st_softc *st, int number, int flags)
{
struct scsi_write_filemarks *cmd;
struct scsi_xfer *xs;
int error;
if (number < 0)
return EINVAL;
xs = scsi_xs_get(st->sc_link, flags);
if (xs == NULL)
return ENOMEM;
xs->cmdlen = sizeof(*cmd);
xs->timeout = ST_IO_TIME * 4;
switch (number) {
case 0: /* really a command to sync the drive's buffers */
break;
case 1:
if (ISSET(st->flags, ST_FM_WRITTEN)) /* already have one down */
CLR(st->flags, ST_WRITTEN);
else
SET(st->flags, ST_FM_WRITTEN);
CLR(st->flags, ST_PER_ACTION);
break;
default:
CLR(st->flags, ST_PER_ACTION | ST_WRITTEN);
break;
}
cmd = (struct scsi_write_filemarks *)&xs->cmd;
cmd->opcode = WRITE_FILEMARKS;
_lto3b(number, cmd->number);
error = scsi_xs_sync(xs);
scsi_xs_put(xs);
if (error != 0) {
st->media_fileno = -1;
st->media_blkno = -1;
st->media_eom = -1;
} else if (st->media_fileno != -1) {
st->media_fileno += number;
st->media_eom = st->media_fileno;
st->media_blkno = 0;
}
return error;
}
/*
* 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(struct st_softc *st, int 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 (error == 0 && position != 0)
error = st_space(st, -*nmarks, SP_FILEMARKS, flags);
return error;
}
/*
* load/unload/retension
*/
int
st_load(struct st_softc *st, u_int type, int flags)
{
struct scsi_load *cmd;
struct scsi_xfer *xs;
int error, nmarks;
st->media_fileno = -1;
st->media_blkno = -1;
st->media_eom = -1;
if (type != LD_LOAD) {
error = st_check_eod(st, 0, &nmarks, flags);
if (error != 0)
return error;
}
if (ISSET(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);
}
return 0;
}
xs = scsi_xs_get(st->sc_link, flags);
if (xs == NULL)
return ENOMEM;
xs->cmdlen = sizeof(*cmd);
xs->timeout = ST_SPC_TIME;
cmd = (struct scsi_load *)&xs->cmd;
cmd->opcode = LOAD;
cmd->how = type;
error = scsi_xs_sync(xs);
scsi_xs_put(xs);
return error;
}
/*
* Rewind the device
*/
int
st_rewind(struct st_softc *st, u_int immediate, int flags)
{
struct scsi_rewind *cmd;
struct scsi_xfer *xs;
int error, nmarks;
error = st_check_eod(st, 0, &nmarks, flags);
if (error != 0)
return error;
CLR(st->flags, ST_PER_ACTION);
xs = scsi_xs_get(st->sc_link, flags);
if (xs == NULL)
return ENOMEM;
xs->cmdlen = sizeof(*cmd);
xs->timeout = immediate ? ST_CTL_TIME : ST_SPC_TIME;
cmd = (struct scsi_rewind *)&xs->cmd;
cmd->opcode = REWIND;
cmd->byte2 = immediate;
error = scsi_xs_sync(xs);
scsi_xs_put(xs);
if (error == 0) {
st->media_fileno = 0;
st->media_blkno = 0;
}
return error;
}
/*
* Look at the returned sense and act on the error to determine
* the unix error number to pass back... (0 = report no error)
* (-1 = continue processing)
*/
int
st_interpret_sense(struct scsi_xfer *xs)
{
struct scsi_sense_data *sense = &xs->sense;
struct scsi_link *link = xs->sc_link;
struct scsi_space *space;
struct st_softc *st = link->device_softc;
u_int8_t serr = sense->error_code & SSD_ERRCODE;
u_int8_t skey = sense->flags & SSD_KEY;
int32_t resid, info, number;
int datalen;
if (!ISSET(link->flags, SDEV_OPEN) ||
(serr != SSD_ERRCODE_CURRENT && serr != SSD_ERRCODE_DEFERRED))
return scsi_interpret_sense(xs);
info = (int32_t)_4btol(sense->info);
switch (skey) {
/*
* We do custom processing in st for the unit becoming ready case.
* in this case we do not allow xs->retries to be decremented
* only on the "Unit Becoming Ready" case. This is because tape
* drives report "Unit Becoming Ready" when loading media, etc.
* and can take a long time. Rather than having a massive timeout
* for all operations (which would cause other problems) we allow
* operations to wait (but be interruptible with Ctrl-C) forever
* as long as the drive is reporting that it is becoming ready.
* all other cases are handled as per the default.
*/
case SKEY_NOT_READY:
if (ISSET(xs->flags, SCSI_IGNORE_NOT_READY))
return 0;
switch (ASC_ASCQ(sense)) {
case SENSE_NOT_READY_BECOMING_READY:
SC_DEBUG(link, SDEV_DB1, ("not ready: busy (%#x)\n",
sense->add_sense_code_qual));
/* don't count this as a retry */
xs->retries++;
return scsi_delay(xs, 1);
default:
return scsi_interpret_sense(xs);
}
break;
case SKEY_BLANK_CHECK:
if (sense->error_code & SSD_ERRCODE_VALID &&
xs->cmd.opcode == SPACE) {
switch (ASC_ASCQ(sense)) {
case SENSE_END_OF_DATA_DETECTED:
SET(st->flags, ST_EOD_DETECTED);
space = (struct scsi_space *)&xs->cmd;
number = _3btol(space->number);
st->media_fileno = number - info;
st->media_eom = st->media_fileno;
return 0;
case SENSE_BEGINNING_OF_MEDIUM_DETECTED:
/* Standard says: Position is undefined! */
SET(st->flags, ST_BOD_DETECTED);
st->media_fileno = -1;
st->media_blkno = -1;
return 0;
}
}
break;
case SKEY_NO_SENSE:
case SKEY_RECOVERED_ERROR:
case SKEY_MEDIUM_ERROR:
case SKEY_VOLUME_OVERFLOW:
break;
default:
return scsi_interpret_sense(xs);
}
/*
* 'resid' can be in units of st->blksize or bytes. xs->resid and
* xs->datalen are always in units of bytes. So we need a variable
* to store datalen in the same units as resid and to adjust
* xs->resid to be in bytes.
*/
if (ISSET(sense->error_code, SSD_ERRCODE_VALID)) {
if (ISSET(st->flags, ST_FIXEDBLOCKS))
resid = info * st->blksize; /* XXXX overflow? */
else
resid = info;
} else {
resid = xs->datalen;
}
if (resid < 0 || resid > xs->datalen)
xs->resid = xs->datalen;
else
xs->resid = resid;
datalen = xs->datalen;
if (ISSET(st->flags, ST_FIXEDBLOCKS)) {
resid /= st->blksize;
datalen /= st->blksize;
}
if (ISSET(sense->flags, SSD_FILEMARK)) {
if (st->media_fileno != -1) {
st->media_fileno++;
if (st->media_fileno > st->media_eom)
st->media_eom = st->media_fileno;
st->media_blkno = 0;
}
if (!ISSET(st->flags, ST_FIXEDBLOCKS))
return 0;
SET(st->flags, ST_AT_FILEMARK);
}
if (ISSET(sense->flags, SSD_EOM)) {
SET(st->flags, ST_EOM_PENDING);
xs->resid = 0;
if (ISSET(st->flags, ST_FIXEDBLOCKS))
return 0;
}
if (ISSET(sense->flags, SSD_ILI)) {
if (!ISSET(st->flags, ST_FIXEDBLOCKS)) {
if (resid >= 0 && resid <= datalen)
return 0;
if (!ISSET(xs->flags, SCSI_SILENT))
printf( "%s: bad residual %d out of "
"%d\n", st->sc_dev.dv_xname, resid,
datalen);
return EIO;
}
/* Fixed size blocks. */
if (ISSET(sense->error_code, SSD_ERRCODE_VALID))
if (!ISSET(xs->flags, SCSI_SILENT))
printf("%s: block wrong size, %d blocks "
"residual\n", st->sc_dev.dv_xname, resid);
SET(st->flags, ST_EIO_PENDING);
/*
* 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 (ISSET(st->quirks, ST_Q_SENSE_HELP) &&
!ISSET(link->flags, SDEV_MEDIA_LOADED))
st->blksize -= 512;
}
if (ISSET(st->flags, ST_FIXEDBLOCKS) && xs->resid == xs->datalen) {
if (ISSET(st->flags, ST_EIO_PENDING))
return EIO;
if (ISSET(st->flags, ST_AT_FILEMARK))
return 0;
}
if (skey == 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 (ISSET(st->quirks, ST_Q_SENSE_HELP) &&
!ISSET(link->flags, SDEV_MEDIA_LOADED)) {
/* still starting */
st->blksize -= 512;
} else if (!ISSET(st->flags, ST_2FM_AT_EOD | ST_BLANK_READ)) {
SET(st->flags, ST_BLANK_READ);
SET(st->flags, ST_EOM_PENDING);
xs->resid = xs->datalen;
return 0;
}
}
return scsi_interpret_sense(xs);
}
/*
* 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(struct st_softc *st)
{
char *buf = NULL;
int readsize, maxblksize = 1024;
int error = 0;
if ((error = st_mode_sense(st, 0)) != 0)
goto done;
buf = dma_alloc(maxblksize, PR_NOWAIT);
if (buf == NULL) {
error = ENOMEM;
goto done;
}
st->blksize = 1024;
do {
switch (st->blksize) {
case 512:
case 1024:
readsize = st->blksize;
SET(st->flags, ST_FIXEDBLOCKS);
break;
default:
readsize = 1;
CLR(st->flags, ST_FIXEDBLOCKS);
}
if ((error = st_mode_select(st, 0)) != 0)
goto done;
st_read(st, buf, readsize, SCSI_SILENT); /* XXX */
if ((error = st_rewind(st, 0, 0)) != 0)
goto done;
} while (readsize != 1 && readsize > st->blksize);
done:
dma_free(buf, maxblksize);
return error;
}
![[BACK]](/icons/back.gif){kind=icon}
Return to st.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / sys / scsi