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freebsd-dev/sys/scsi/st.c
Stefan Eßer 92a25df797 Reviewed by: Julian Elischer / Jordan K. Hubbard 
Changes are only effective, if NEW_SCSICONF is defined:

1) Added u_int16 quirks to struct scsi_link for device quirks.
2) Added void *devmodes to struct scsi_link for tape density modes.
3) Modified selectdev() to return first full match (with wildcard).

With this patch all device dependent configuration is done in one place
(scsiconf.c), while there were some specifications in st.c and some
hardware dependent drivers (ie. ncr.c) before.
1994-09-28 20:16:45 +00:00

1957 lines
49 KiB
C
Raw Blame History

/*
* Written by Julian Elischer (julian@tfs.com)(now julian@DIALix.oz.au)
* 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.
*
* $Id: st.c,v 1.18 1994/08/31 06:17:49 davidg Exp $
*/
/*
* 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/types.h>
#include <st.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <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 <scsi/scsi_all.h>
#include <scsi/scsi_tape.h>
#include <scsi/scsiconf.h>
u_int32 ststrats, stqueues;
/* Defines for device specific stuff */
#define PAGE_0_SENSE_DATA_SIZE 12
#define PAGESIZ 4096
#define DEF_FIXED_BSIZE 512
#define ST_RETRIES 4 /* only on non IO commands */
#define MODE(z) ( (minor(z) & 0x03) )
#define DSTY(z) ( ((minor(z) >> 2) & 0x03) )
#define UNIT(z) ( (minor(z) >> 4) )
#define CTLMODE 3
#define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified
* in SCSI II spec. */
#ifndef NEW_SCSICONF
/*
* Define various devices that we know mis-behave in some way,
* and note how they are bad, so we can correct for them
*/
struct modes {
u_int32 blksiz;
u_int32 quirks; /* same definitions as in rogues */
char density;
char spare[3];
};
struct rogues {
char *name;
char *manu;
char *model;
char *version;
u_int32 quirks; /* valid for all modes */
struct modes modes[4];
};
/* define behaviour codes (quirks) */
#define ST_Q_NEEDS_PAGE_0 0x00001
#define ST_Q_FORCE_FIXED_MODE 0x00002
#define ST_Q_FORCE_VAR_MODE 0x00004
#define ST_Q_SNS_HLP 0x00008 /* must do READ for good MODE SENSE */
#define ST_Q_IGNORE_LOADS 0x00010
#define ST_Q_BLKSIZ 0x00020 /* variable-block media_blksiz > 0 */
static struct rogues gallery[] = /* ends with an all-null entry */
{
{"Such an old device ", "pre-scsi", " unknown model ", "????",
0,
{
{512, ST_Q_FORCE_FIXED_MODE, 0}, /* minor 0,1,2,3 */
{512, ST_Q_FORCE_FIXED_MODE, QIC_24}, /* minor 4,5,6,7 */
{0, ST_Q_FORCE_VAR_MODE, HALFINCH_1600}, /* minor 8,9,10,11 */
{0, ST_Q_FORCE_VAR_MODE, HALFINCH_6250} /* minor 12,13,14,15 */
}
},
{"Tandberg tdc3600", "TANDBERG", " TDC 3600", "????",
ST_Q_NEEDS_PAGE_0,
{
{0, 0, 0}, /* minor 0,1,2,3 */
{0, ST_Q_FORCE_VAR_MODE, QIC_525}, /* minor 4,5,6,7 */
{0, 0, QIC_150}, /* minor 8,9,10,11 */
{0, 0, QIC_120} /* minor 12,13,14,15 */
}
},
{"Rev 5 of the Archive 2525", "ARCHIVE ", "VIPER 2525 25462", "-005",
0,
{
{0, ST_Q_SNS_HLP, 0}, /* minor 0,1,2,3 */
{0, ST_Q_SNS_HLP, QIC_525}, /* minor 4,5,6,7 */
{0, 0, QIC_150}, /* minor 8,9,10,11 */
{0, 0, QIC_120} /* minor 12,13,14,15 */
}
},
{"Archive Viper 150", "ARCHIVE ", "VIPER 150", "????",
ST_Q_NEEDS_PAGE_0,
{
{0, 0, 0}, /* minor 0,1,2,3 */
{0, 0, QIC_150}, /* minor 4,5,6,7 */
{0, 0, QIC_120}, /* minor 8,9,10,11 */
{0, 0, QIC_24} /* minor 12,13,14,15 */
}
},
{"Wangtek 5525ES", "WANGTEK ", "5525ES SCSI REV7", "????",
0,
{
{0, 0, 0}, /* minor 0,1,2,3 */
{0, ST_Q_BLKSIZ, QIC_525}, /* minor 4,5,6,7 */
{0, 0, QIC_150}, /* minor 8,9,10,11 */
{0, 0, QIC_120} /* minor 12,13,14,15 */
}
},
{"WangDAT model 1300", "WangDAT ", "Model 1300", "????",
0,
{
{0, 0, 0}, /* minor 0,1,2,3 */
{512, ST_Q_FORCE_FIXED_MODE, 0x13}, /* minor 4,5,6,7 */
{1024, ST_Q_FORCE_FIXED_MODE, 0x13}, /* minor 8,9,10,11 */
{0, ST_Q_FORCE_VAR_MODE, 0x13} /* minor 12,13,14,15 */
}
},
{(char *) 0}
};
#endif /* NEW_SCSICONF */
errval st_space __P((u_int32 unit, int32 number, u_int32 what, u_int32 flags));
errval st_rewind __P((u_int32 unit, boolean immed, u_int32 flags));
errval st_mode_sense __P((u_int32 unit, u_int32 flags));
errval st_decide_mode __P((u_int32 unit, boolean first_read));
errval st_rd_blk_lim __P((u_int32 unit, u_int32 flags));
errval st_touch_tape __P((u_int32 unit));
errval st_write_filemarks __P((u_int32 unit, int32 number, u_int32 flags));
errval st_load __P((u_int32 unit, u_int32 type, u_int32 flags));
errval st_mode_select __P((u_int32 unit, u_int32 flags));
void ststrategy();
void stminphys();
int32 st_chkeod();
errval stattach();
void ststart();
void st_unmount();
errval st_mount_tape();
void st_loadquirks();
#ifndef NEW_SCSICONF
void st_identify_drive();
#endif
errval st_interpret_sense();
#define ESUCCESS 0
#define NOEJECT 0
#define EJECT 1
struct scsi_device st_switch =
{
st_interpret_sense, /* check errors with us first */
ststart, /* we have a queue, and this is how we service it */
NULL,
NULL, /* use the default 'done' routine */
"st",
0,
{ 0, 0 }
};
struct st_data {
/*--------------------present operating parameters, flags etc.----------------*/
u_int32 flags; /* see below */
u_int32 blksiz; /* blksiz we are using */
u_int32 density; /* present density */
u_int32 quirks; /* quirks for the open mode */
u_int32 last_dsty; /* last density openned */
/*--------------------device/scsi parameters----------------------------------*/
struct scsi_link *sc_link; /* our link to the adpter etc. */
/*--------------------parameters reported by the device ----------------------*/
u_int32 blkmin; /* min blk size */
u_int32 blkmax; /* max blk size */
#ifndef NEW_SCSICONF
struct rogues *rogues; /* if we have a rogue entry */
#endif
/*--------------------parameters reported by the device for this media--------*/
u_int32 numblks; /* nominal blocks capacity */
u_int32 media_blksiz; /* 0 if not ST_FIXEDBLOCKS */
u_int32 media_density; /* this is what it said when asked */
/*--------------------quirks for the whole drive------------------------------*/
u_int32 drive_quirks; /* quirks of this drive */
/*--------------------How we should set up when openning each minor device----*/
#ifdef NEW_SCSICONF
st_modes modes; /* plus more for each mode */
#else
struct modes modes[4]; /* plus more for each mode */
#endif
u_int8 modeflags[4]; /* flags for the modes */
#define DENSITY_SET_BY_USER 0x01
#define DENSITY_SET_BY_QUIRK 0x02
#define BLKSIZE_SET_BY_USER 0x04
#define BLKSIZE_SET_BY_QUIRK 0x08
/*--------------------storage for sense data returned by the drive------------*/
unsigned char sense_data[12]; /*
* additional sense data needed
* for mode sense/select.
*/
struct buf *buf_queue; /* the queue of pending IO operations */
struct scsi_xfer scsi_xfer; /* scsi xfer struct for this drive */
u_int32 xfer_block_wait; /* is a process waiting? */
} *st_data[NST];
#define ST_INITIALIZED 0x01
#define ST_INFO_VALID 0x02
#define ST_OPEN 0x04
#define ST_BLOCK_SET 0x08 /* block size, mode set by ioctl */
#define ST_WRITTEN 0x10 /* data have been written, EOD needed */
#define ST_FIXEDBLOCKS 0x20
#define ST_AT_FILEMARK 0x40
#define ST_EIO_PENDING 0x80 /* we couldn't report it then (had data) */
#define ST_NEW_MOUNT 0x100 /* still need to decide mode */
#define ST_READONLY 0x200 /* st_mode_sense says write protected */
#define ST_FM_WRITTEN 0x400 /*
* EOF file mark written -- used with
* ~ST_WRITTEN to indicate that multiple file
* marks have been written
*/
#define ST_BLANK_READ 0x800 /* BLANK CHECK encountered already */
#define ST_2FM_AT_EOD 0x1000 /* write 2 file marks at EOD */
#define ST_MOUNTED 0x2000 /* Device is presently mounted */
#define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_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)
static u_int32 next_st_unit = 0;
/*
* The routine called by the low level scsi routine when it discovers
* A device suitable for this driver
*/
errval
stattach(sc_link)
struct scsi_link *sc_link;
{
u_int32 unit;
struct st_data *st;
SC_DEBUG(sc_link, SDEV_DB2, ("stattach: "));
/*
* Check we have the resources for another drive
*/
unit = next_st_unit++;
if (unit >= NST) {
printf("Too many scsi tapes..(%d > %d) reconfigure kernel\n",
(unit + 1), NST);
return 0;
}
if (st_data[unit]) {
printf("st%d: Already has storage!\n", unit);
return 0;
}
sc_link->device = &st_switch;
sc_link->dev_unit = unit;
st = st_data[unit] = malloc(sizeof(struct st_data), M_DEVBUF, M_NOWAIT);
if (!st) {
printf("st%d: malloc failed in st.c\n", unit);
return 0;
}
bzero(st, sizeof(struct st_data));
/*
* Store information needed to contact our base driver
*/
st->sc_link = sc_link;
/*
* Check if the drive is a known criminal and take
* Any steps needed to bring it into line
*/
#ifdef NEW_SCSICONF
st_loadquirks(st);
#else
st_identify_drive(unit);
#endif
/*
* Use the subdriver to request information regarding
* the drive. We cannot use interrupts yet, so the
* request must specify this.
*/
if (st_mode_sense(unit, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) {
printf("st%d: drive offline\n", unit);
} else {
printf("st%d: density code 0x%x, ", unit, st->media_density);
if (!scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) {
if (st->media_blksiz) {
printf("%d-byte", st->media_blksiz);
} else {
printf("variable");
}
printf(" blocks, write-%s\n",
(st->flags & ST_READONLY) ? "protected" : "enabled");
} else {
printf(" drive empty\n");
}
}
/*
* Set up the buf queue for this device
*/
st->buf_queue = 0;
st->flags |= ST_INITIALIZED;
return 0;
}
#ifndef NEW_SCSICONF
/*
* Use the inquiry routine in 'scsi_base' to get drive info so we can
* Further tailor our behaviour.
*/
void
st_identify_drive(unit)
u_int32 unit;
{
struct st_data *st = st_data[unit];
struct scsi_inquiry_data inqbuf;
struct rogues *finger;
char manu[32];
char model[32];
char model2[32];
char version[32];
u_int32 model_len;
/*
* Get the device type information
*/
if (scsi_inquire(st->sc_link, &inqbuf,
SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT) != 0) {
printf("st%d: couldn't get device type, using default\n", unit);
return;
}
if ((inqbuf.version & SID_ANSII) == 0) {
/*
* If not advanced enough, use default values
*/
strncpy(manu, "pre-scsi", 8);
manu[8] = 0;
strncpy(model, " unknown model ", 16);
model[16] = 0;
strncpy(version, "????", 4);
version[4] = 0;
} else {
strncpy(manu, inqbuf.vendor, 8);
manu[8] = 0;
strncpy(model, inqbuf.product, 16);
model[16] = 0;
strncpy(version, inqbuf.revision, 4);
version[4] = 0;
}
/*
* Load the parameters for this kind of device, so we
* treat it as appropriate for each operating mode.
* Only check the number of characters in the array's
* model entry, not the entire model string returned.
*/
finger = gallery;
while (finger->name) {
model_len = 0;
while (finger->model[model_len] && (model_len < 32)) {
model2[model_len] = model[model_len];
model_len++;
}
model2[model_len] = 0;
if ((strcmp(manu, finger->manu) == 0)
&& (strcmp(model2, finger->model) == 0 ||
strcmp("????????????????", finger->model) == 0)
&& (strcmp(version, finger->version) == 0 ||
strcmp("????", finger->version) == 0)) {
printf("st%d: %s is a known rogue\n", unit, finger->name);
st->rogues = finger;
st->drive_quirks = finger->quirks;
st->quirks = finger->quirks; /*start value */
st_loadquirks(st);
break;
} else {
finger++; /* go to next suspect */
}
}
}
#endif /* NEW_SCSICONF */
/*
* 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_data *st;
{
int i;
#ifdef NEW_SCSICONF
struct st_mode *mode;
struct st_mode *mode2;
mode = (struct st_mode*) st->sc_link->devmodes;
if (!mode)
return;
st->quirks = st->drive_quirks = st->sc_link->quirks;
#else
struct modes *mode;
struct modes *mode2;
if (!st->rogues)
return;
mode = st->rogues->modes;
#endif
mode2 = st->modes;
for (i = 0; i < 4; i++) {
bzero(mode2, sizeof(*mode2));
st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK
| DENSITY_SET_BY_QUIRK
| BLKSIZE_SET_BY_USER
| DENSITY_SET_BY_USER);
if (mode->blksiz && ((mode->quirks | st->drive_quirks)
& (ST_Q_FORCE_FIXED_MODE))) {
mode2->blksiz = mode->blksiz;
st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK;
} else {
if ((mode->quirks | st->drive_quirks)
& ST_Q_FORCE_VAR_MODE) {
mode2->blksiz = 0;
st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK;
}
}
if (mode->density) {
mode2->density = mode->density;
st->modeflags[i] |= DENSITY_SET_BY_QUIRK;
}
mode++;
mode2++;
}
}
/*
* open the device.
*/
errval
stopen(dev, flags)
dev_t dev;
u_int32 flags;
{
u_int32 unit, mode, dsty;
errval errno = 0;
struct st_data *st;
struct scsi_link *sc_link;
unit = UNIT(dev);
mode = MODE(dev);
dsty = DSTY(dev);
/*
* Check the unit is legal
*/
if (unit >= NST) {
return (ENXIO);
}
st = st_data[unit];
/*
* Make sure the device has been initialised
*/
if ((st == NULL) || (!(st->flags & ST_INITIALIZED)))
return (ENXIO);
sc_link = st->sc_link;
SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n"
,dev, unit, NST));
/*
* Only allow one at a time
*/
if (st->flags & ST_OPEN) {
return (EBUSY);
}
/*
* Throw out a dummy instruction to catch 'Unit attention
* errors (the error handling will invalidate all our
* device info if we get one, but otherwise, ignore it)
*/
scsi_test_unit_ready(sc_link, SCSI_SILENT);
sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */
/*
* If the mode is 3 (e.g. minor = 3,7,11,15)
* then the device has been openned to set defaults
* This mode does NOT ALLOW I/O, only ioctls
*/
if (mode == CTLMODE)
return 0;
/*
* Check that the device is ready to use (media loaded?)
* This time take notice of the return result
*/
if (errno = (scsi_test_unit_ready(sc_link, 0))) {
printf("st%d: not ready\n", unit);
st_unmount(unit, NOEJECT);
return (errno);
}
/*
* 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)
|| (!(sc_link->flags & SDEV_MEDIA_LOADED))) {
st_unmount(unit, NOEJECT);
}
/*
* If we are not mounted, then we should start a new
* mount session.
*/
if (!(st->flags & ST_MOUNTED)) {
st_mount_tape(dev, flags);
st->last_dsty = dsty;
}
/*
* 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)
st->flags |= ST_WRITTEN;
SC_DEBUG(sc_link, SDEV_DB2, ("Open complete\n"));
st->flags |= ST_OPEN;
return (0);
}
/*
* close the device.. only called if we are the LAST
* occurence of an open device
*/
errval
stclose(dev)
dev_t dev;
{
unsigned char unit, mode;
struct st_data *st;
struct scsi_link *sc_link;
unit = UNIT(dev);
mode = MODE(dev);
st = st_data[unit];
sc_link = st->sc_link;
SC_DEBUG(sc_link, SDEV_DB1, ("closing\n"));
if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN)
st_write_filemarks(unit, 1, 0);
switch (mode & 0x3) {
case 0:
case 3: /* for now */
st_unmount(unit, NOEJECT);
break;
case 1: /*leave mounted unless media seems to have been removed */
if (!(sc_link->flags & SDEV_MEDIA_LOADED)) {
st_unmount(unit, NOEJECT);
}
break;
case 2:
st_unmount(unit, EJECT);
break;
}
sc_link->flags &= ~SDEV_OPEN;
st->flags &= ~ST_OPEN;
return (0);
}
/*
* 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.
*/
errval
st_mount_tape(dev, flags)
dev_t dev;
u_int32 flags;
{
u_int32 unit, mode, dsty;
struct st_data *st;
struct scsi_link *sc_link;
errval errno = 0;
unit = UNIT(dev);
mode = MODE(dev);
dsty = DSTY(dev);
st = st_data[unit];
sc_link = st->sc_link;
if (st->flags & ST_MOUNTED)
return 0;
SC_DEBUG(sc_link, SDEV_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 (errno = st_load(unit, LD_LOAD, 0)) {
return (errno);
}
/*
* Throw another dummy instruction to catch
* 'Unit attention' errors. Some drives appear to give
* these after doing a Load instruction.
* (noteably some DAT drives)
*/
scsi_test_unit_ready(sc_link, SCSI_SILENT);
/*
* 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_SNS_HLP) {
if (errno = st_touch_tape(unit))
return errno;
}
/*
* Load the physical device parameters
* loads: blkmin, blkmax
*/
if (errno = st_rd_blk_lim(unit, 0)) {
return errno;
}
/*
* Load the media dependent parameters
* includes: media_blksiz,media_density,numblks
* As we have a tape in, it should be reflected here.
* If not you may need the "quirk" above.
*/
if (errno = st_mode_sense(unit, 0)) {
return errno;
}
/*
* 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->blksiz = st->modes[dsty].blksiz;
if (st->blksiz) {
st->flags |= ST_FIXEDBLOCKS;
}
} else {
if (errno = st_decide_mode(unit, FALSE)) {
return errno;
}
}
if (errno = st_mode_select(unit, 0)) {
printf("st%d: Cannot set selected mode", unit);
return errno;
}
scsi_prevent(sc_link, PR_PREVENT, 0); /* who cares if it fails? */
st->flags &= ~ST_NEW_MOUNT;
st->flags |= ST_MOUNTED;
sc_link->flags |= SDEV_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(int unit, boolean eject)
{
struct st_data *st = st_data[unit];
struct scsi_link *sc_link = st->sc_link;
int32 nmarks;
if (!(st->flags & ST_MOUNTED))
return;
SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n"));
st_chkeod(unit, FALSE, &nmarks, SCSI_SILENT);
st_rewind(unit, FALSE, SCSI_SILENT);
scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT);
if (eject) {
st_load(unit, LD_UNLOAD, SCSI_SILENT);
}
st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT);
sc_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)
*/
errval
st_decide_mode(unit, first_read)
u_int32 unit;
boolean first_read;
{
struct st_data *st = st_data[unit];
#ifdef SCSIDEBUG
struct scsi_link *sc_link = st->sc_link;
#endif
SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n"));
/*
* If the user hasn't already specified fixed or variable-length
* blocks and the block size (zero if variable-length), we'll
* have to try to figure them out ourselves.
*
* Our first shot at a method is, "The quirks made me do it!"
*/
switch ((int)(st->quirks & (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE))) {
case (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE):
printf("st%d: bad quirks\n", unit);
return (EINVAL);
case ST_Q_FORCE_FIXED_MODE: /*specified fixed, but not what size */
st->flags |= ST_FIXEDBLOCKS;
if (st->blkmin && (st->blkmin == st->blkmax))
st->blksiz = st->blkmin;
else if (st->media_blksiz > 0)
st->blksiz = st->media_blksiz;
else
st->blksiz = DEF_FIXED_BSIZE;
SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force fixed mode(%d)\n",
st->blksiz));
goto done;
case ST_Q_FORCE_VAR_MODE:
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force variable mode\n"));
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)) {
st->flags |= ST_FIXEDBLOCKS;
st->blksiz = st->blkmin;
SC_DEBUG(sc_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 ((int)st->density) {
case HALFINCH_800:
case HALFINCH_1600:
case HALFINCH_6250:
case DDS:
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
SC_DEBUG(sc_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:
st->flags |= ST_FIXEDBLOCKS;
if (st->media_blksiz > 0) {
st->blksiz = st->media_blksiz;
} else {
st->blksiz = DEF_FIXED_BSIZE;
}
SC_DEBUG(sc_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
&& (!(st->quirks & ST_Q_BLKSIZ)
|| (st->media_blksiz == 0)
|| (st->media_blksiz == DEF_FIXED_BSIZE)
|| (st->media_blksiz == 1024))) {
if (st->media_blksiz == 0) {
st->flags &= ~ST_FIXEDBLOCKS;
} else {
st->flags |= ST_FIXEDBLOCKS;
}
st->blksiz = st->media_blksiz;
SC_DEBUG(sc_link, SDEV_DB3,
("Used media_blksiz of %d\n", st->media_blksiz));
goto done;
}
/*
* We're getting no hints from any direction. Choose variable-
* length blocks arbitrarily.
*/
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
SC_DEBUG(sc_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 ((int)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:
st->flags &= ~ST_2FM_AT_EOD;
break;
default:
st->flags |= ST_2FM_AT_EOD;
}
return 0;
}
/*
* trim the size of the transfer if needed,
* called by physio
* basically the smaller of our min and the scsi driver's
* minphys
*/
void
stminphys(bp)
struct buf *bp;
{
(*(st_data[UNIT(bp->b_dev)]->sc_link->adapter->scsi_minphys)) (bp);
}
/*
* 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 buf **dp;
unsigned char unit;
u_int32 opri;
struct st_data *st;
ststrats++;
unit = UNIT((bp->b_dev));
st = st_data[unit];
SC_DEBUG(st->sc_link, SDEV_DB1,
(" strategy: %d 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;
}
/*
* Odd sized request on fixed drives are verboten
*/
if (st->flags & ST_FIXEDBLOCKS) {
if (bp->b_bcount % st->blksiz) {
printf("st%d: bad request, must be multiple of %d\n",
unit, st->blksiz);
bp->b_error = EIO;
goto bad;
}
}
/*
* as are out-of-range requests on variable drives.
*/
else if (bp->b_bcount < st->blkmin || bp->b_bcount > st->blkmax) {
printf("st%d: bad request, must be between %d and %d\n",
unit, st->blkmin, st->blkmax);
bp->b_error = EIO;
goto bad;
}
stminphys(bp);
opri = splbio();
/*
* Use a bounce buffer if necessary
*/
#ifdef BOUNCE_BUFFERS
if (st->sc_link->flags & SDEV_BOUNCE)
vm_bounce_alloc(bp);
#endif
/*
* 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() ))
*/
dp = &(st->buf_queue);
while (*dp) {
dp = &((*dp)->b_actf);
}
*dp = bp;
bp->b_actf = NULL;
/*
* 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(unit);
splx(opri);
return;
bad:
bp->b_flags |= B_ERROR;
done:
/*
* Correctly set the buf to indicate a completed xfer
*/
iodone(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 scsi_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(unit)
u_int32 unit;
{
struct st_data *st = st_data[unit];
struct scsi_link *sc_link = st->sc_link;
register struct buf *bp = 0;
struct scsi_rw_tape cmd;
u_int32 flags;
SC_DEBUG(sc_link, SDEV_DB2, ("ststart "));
/*
* See if there is a buf to do and we are not already
* doing one
*/
while (sc_link->opennings != 0) {
/* if a special awaits, let it proceed first */
if (sc_link->flags & SDEV_WAITING) {
sc_link->flags &= ~SDEV_WAITING;
wakeup((caddr_t)sc_link);
return;
}
if ((bp = st->buf_queue) == NULL) {
return; /* no work to bother with */
}
st->buf_queue = bp->b_actf;
/*
* if the device has been unmounted byt the user
* then throw away all requests until done
*/
if ((!(st->flags & ST_MOUNTED))
|| (!(sc_link->flags & SDEV_MEDIA_LOADED))) {
/* make sure that one implies the other.. */
sc_link->flags &= ~SDEV_MEDIA_LOADED;
goto badnews;
}
/*
* only FIXEDBLOCK devices have pending 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(unit, 0, SP_FILEMARKS, 0) !=
ESUCCESS)
goto badnews;
} 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 EIO (e.g. EOM) but have not reported it
* yet then we should report it now
*/
if (st->flags & ST_EIO_PENDING) {
bp->b_resid = bp->b_bcount;
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
st->flags &= ~ST_EIO_PENDING;
biodone(bp);
continue; /* seek more work */
}
}
/*
* Fill out the scsi command
*/
bzero(&cmd, sizeof(cmd));
if ((bp->b_flags & B_READ) == B_WRITE) {
cmd.op_code = WRITE_COMMAND_TAPE;
st->flags &= ~ST_FM_WRITTEN;
st->flags |= ST_WRITTEN;
flags = SCSI_DATA_OUT;
} else {
cmd.op_code = READ_COMMAND_TAPE;
flags = SCSI_DATA_IN;
}
/*
* Handle "fixed-block-mode" tape drives by using the
* block count instead of the length.
*/
if (st->flags & ST_FIXEDBLOCKS) {
cmd.byte2 |= SRWT_FIXED;
lto3b(bp->b_bcount / st->blksiz, cmd.len);
} else {
lto3b(bp->b_bcount, cmd.len);
}
/*
* go ask the adapter to do all this for us
*/
if (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &cmd,
sizeof(cmd),
(u_char *) bp->b_un.b_addr,
bp->b_bcount,
0, /* can't retry a read on a tape really */
100000,
bp,
flags | SCSI_NOSLEEP) == SUCCESSFULLY_QUEUED) {
stqueues++;
} else {
badnews:
printf("st%d: oops not queued\n", unit);
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
biodone(bp);
}
} /* go back and see if we can cram more work in.. */
}
/*
* Perform special action on behalf of the user;
* knows about the internals of this device
*/
errval
stioctl(dev, cmd, arg, flag)
dev_t dev;
int cmd;
caddr_t arg;
int flag;
{
errval errcode = 0;
unsigned char unit;
u_int32 number, flags, dsty;
struct st_data *st;
u_int32 hold_blksiz;
u_int32 hold_density;
int32 nmarks;
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 = UNIT(dev);
dsty = DSTY(dev);
st = st_data[unit];
hold_blksiz = st->blksiz;
hold_density = st->density;
switch (cmd) {
case MTIOCGET:
{
struct mtget *g = (struct mtget *) arg;
SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n"));
bzero(g, sizeof(struct mtget));
g->mt_type = 0x7; /* Ultrix compat *//*? */
g->mt_density = st->density;
g->mt_blksiz = st->blksiz;
g->mt_density0 = st->modes[0].density;
g->mt_density1 = st->modes[1].density;
g->mt_density2 = st->modes[2].density;
g->mt_density3 = st->modes[3].density;
g->mt_blksiz0 = st->modes[0].blksiz;
g->mt_blksiz1 = st->modes[1].blksiz;
g->mt_blksiz2 = st->modes[2].blksiz;
g->mt_blksiz3 = st->modes[3].blksiz;
break;
}
case MTIOCTOP:
{
SC_DEBUG(st->sc_link, SDEV_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 */
errcode = st_write_filemarks(unit, number, flags);
break;
case MTBSF: /* backward space file */
number = -number;
case MTFSF: /* forward space file */
errcode = st_chkeod(unit, FALSE, &nmarks, flags);
if (errcode == ESUCCESS)
errcode = st_space(unit, number - nmarks,
SP_FILEMARKS, flags);
break;
case MTBSR: /* backward space record */
number = -number;
case MTFSR: /* forward space record */
errcode = st_chkeod(unit, TRUE, &nmarks, flags);
if (errcode == ESUCCESS)
errcode = st_space(unit, number, SP_BLKS, flags);
break;
case MTREW: /* rewind */
errcode = st_rewind(unit, FALSE, flags);
break;
case MTOFFL: /* rewind and put the drive offline */
st_unmount(unit, EJECT);
break;
case MTNOP: /* no operation, sets status only */
case MTCACHE: /* enable controller cache */
case MTNOCACHE: /* disable controller cache */
break;
case MTSETBSIZ: /* Set block size for device */
#ifdef NOTYET
if (!(st->flags & ST_NEW_MOUNT)) {
uprintf("re-mount tape before changing blocksize");
errcode = EINVAL;
break;
}
#endif
if (number == 0) {
st->flags &= ~ST_FIXEDBLOCKS;
} else {
if ((st->blkmin || st->blkmax) /* they exist */
&&((number < st->blkmin
|| number > st->blkmax))) {
errcode = EINVAL;
break;
}
st->flags |= ST_FIXEDBLOCKS;
}
st->blksiz = number;
st->flags |= ST_BLOCK_SET; /*XXX */
goto try_new_value;
case MTSETDNSTY: /* Set density for device and mode */
if (number > SCSI_2_MAX_DENSITY_CODE) {
errcode = EINVAL;
} else {
st->density = number;
}
goto try_new_value;
default:
errcode = EINVAL;
}
break;
}
case MTIOCIEOT:
case MTIOCEEOT:
break;
default:
if(MODE(dev) == CTLMODE)
errcode = scsi_do_ioctl(st->sc_link,cmd,arg,flag);
else
errcode = ENOTTY;
break;
}
return errcode;
/*-----------------------------*/
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 (errcode = st_mode_select(unit, 0)) { /* put it back as it was */
printf("st%d: Cannot set selected mode", unit);
st->density = hold_density;
st->blksiz = hold_blksiz;
if (st->blksiz) {
st->flags |= ST_FIXEDBLOCKS;
} else {
st->flags &= ~ST_FIXEDBLOCKS;
}
return (errcode);
}
/*
* 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
*/
if (MODE(dev) == 0x03) {
/* special mode */
/* XXX */
switch ((short) (mt->mt_op)) {
case MTSETBSIZ:
st->modes[dsty].blksiz = st->blksiz;
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.
*/
errval
st_read(unit, buf, size, flags)
u_int32 unit, size, flags;
char *buf;
{
struct scsi_rw_tape scsi_cmd;
struct st_data *st = st_data[unit];
/*
* If it's a null transfer, return immediatly
*/
if (size == 0) {
return (ESUCCESS);
}
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = READ_COMMAND_TAPE;
if (st->flags & ST_FIXEDBLOCKS) {
scsi_cmd.byte2 |= SRWT_FIXED;
lto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE),
scsi_cmd.len);
} else {
lto3b(size, scsi_cmd.len);
}
return (scsi_scsi_cmd(st->sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) buf,
size,
0, /* not on io commands */
100000,
NULL,
flags | SCSI_DATA_IN));
}
#ifdef __STDC__
#define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 )
#else
#define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0 )
#endif
/*
* Ask the drive what it's min and max blk sizes are.
*/
errval
st_rd_blk_lim(unit, flags)
u_int32 unit, flags;
{
struct scsi_blk_limits scsi_cmd;
struct scsi_blk_limits_data scsi_blkl;
struct st_data *st = st_data[unit];
errval errno;
struct scsi_link *sc_link = st->sc_link;
/*
* First check if we have it all loaded
*/
if ((sc_link->flags & SDEV_MEDIA_LOADED))
return 0;
/*
* do a 'Read Block Limits'
*/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = READ_BLK_LIMITS;
/*
* do the command, update the global values
*/
if (errno = scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) & scsi_blkl,
sizeof(scsi_blkl),
ST_RETRIES,
5000,
NULL,
flags | SCSI_DATA_IN)) {
return errno;
}
st->blkmin = b2tol(scsi_blkl.min_length);
st->blkmax = _3btol(&scsi_blkl.max_length_2);
SC_DEBUG(sc_link, SDEV_DB3,
("(%d <= blksiz <= %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)
*/
errval
st_mode_sense(unit, flags)
u_int32 unit, flags;
{
u_int32 scsi_sense_len;
errval errno;
char *scsi_sense_ptr;
struct scsi_mode_sense scsi_cmd;
struct scsi_sense {
struct scsi_mode_header header;
struct blk_desc blk_desc;
} scsi_sense;
struct scsi_sense_page_0 {
struct scsi_mode_header header;
struct blk_desc blk_desc;
unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE];
/* Tandberg tape drives returns page 00
* with the sense data, whether or not
* you want it( ie the don't like you
* saying you want anything less!!!!!
* They also expect page 00
* back when you issue a mode select
*/
} scsi_sense_page_0;
struct st_data *st = st_data[unit];
struct scsi_link *sc_link = st->sc_link;
/*
* Define what sort of structure we're working with
*/
if (st->quirks & ST_Q_NEEDS_PAGE_0) {
scsi_sense_len = sizeof(scsi_sense_page_0);
scsi_sense_ptr = (char *) &scsi_sense_page_0;
} else {
scsi_sense_len = sizeof(scsi_sense);
scsi_sense_ptr = (char *) &scsi_sense;
}
/*
* Set up a mode sense
*/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SENSE;
scsi_cmd.length = scsi_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.
*/
if (errno = scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) scsi_sense_ptr,
scsi_sense_len,
ST_RETRIES,
5000,
NULL,
flags | SCSI_DATA_IN)) {
return errno;
}
st->numblks = _3btol(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.nblocks);
st->media_blksiz = _3btol(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.blklen);
st->media_density = ((struct scsi_sense *) scsi_sense_ptr)->blk_desc.density;
if (((struct scsi_sense *) scsi_sense_ptr)->header.dev_spec &
SMH_DSP_WRITE_PROT) {
st->flags |= ST_READONLY;
}
SC_DEBUG(sc_link, SDEV_DB3,
("density code 0x%x, %d-byte blocks, write-%s, ",
st->media_density, st->media_blksiz,
st->flags & ST_READONLY ? "protected" : "enabled"));
SC_DEBUG(sc_link, SDEV_DB3,
("%sbuffered\n",
((struct scsi_sense *) scsi_sense_ptr)->header.dev_spec
& SMH_DSP_BUFF_MODE ? "" : "un"));
if (st->quirks & ST_Q_NEEDS_PAGE_0) {
bcopy(((struct scsi_sense_page_0 *) scsi_sense_ptr)->sense_data,
st->sense_data,
sizeof(((struct scsi_sense_page_0 *) scsi_sense_ptr)->sense_data));
}
sc_link->flags |= SDEV_MEDIA_LOADED;
return 0;
}
/*
* Send a filled out parameter structure to the drive to
* set it into the desire modes etc.
*/
errval
st_mode_select(unit, flags)
u_int32 unit, flags;
{
u_int32 dat_len;
char *dat_ptr;
struct scsi_mode_select scsi_cmd;
struct dat {
struct scsi_mode_header header;
struct blk_desc blk_desc;
} dat;
struct dat_page_0 {
struct scsi_mode_header header;
struct blk_desc blk_desc;
unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE];
} dat_page_0;
struct st_data *st = st_data[unit];
/*
* Define what sort of structure we're working with
*/
if (st->quirks & ST_Q_NEEDS_PAGE_0) {
dat_len = sizeof(dat_page_0);
dat_ptr = (char *) &dat_page_0;
} else {
dat_len = sizeof(dat);
dat_ptr = (char *) &dat;
}
/*
* Set up for a mode select
*/
bzero(dat_ptr, dat_len);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SELECT;
scsi_cmd.length = dat_len;
((struct dat *) dat_ptr)->header.blk_desc_len = sizeof(struct blk_desc);
((struct dat *) dat_ptr)->header.dev_spec |= SMH_DSP_BUFF_MODE_ON;
((struct dat *) dat_ptr)->blk_desc.density = st->density;
if (st->flags & ST_FIXEDBLOCKS) {
lto3b(st->blksiz, ((struct dat *) dat_ptr)->blk_desc.blklen);
}
if (st->quirks & ST_Q_NEEDS_PAGE_0) {
bcopy(st->sense_data, ((struct dat_page_0 *) dat_ptr)->sense_data,
sizeof(((struct dat_page_0 *) dat_ptr)->sense_data));
/* the Tandberg tapes need the block size to */
/* be set on each mode sense/select. */
}
/*
* do the command
*/
return (scsi_scsi_cmd(st->sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) dat_ptr,
dat_len,
ST_RETRIES,
5000,
NULL,
flags | SCSI_DATA_OUT));
}
/*
* skip N blocks/filemarks/seq filemarks/eom
*/
errval
st_space(unit, number, what, flags)
u_int32 unit, what, flags;
int32 number;
{
errval error;
struct scsi_space scsi_cmd;
struct st_data *st = st_data[unit];
switch ((int)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(unit, 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;
}
}
break;
case SP_FILEMARKS:
if (st->flags & ST_EIO_PENDING) {
if (number > 0) { /* pretend we just discover 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++; /* dubious */
}
}
if (number == 0) {
return (ESUCCESS);
}
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = SPACE;
scsi_cmd.byte2 = what & SS_CODE;
lto3b(number, scsi_cmd.number);
return (scsi_scsi_cmd(st->sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
0, /* no retries please , just fail */
600000, /* 10 mins enough? */
NULL,
flags));
}
/*
* write N filemarks
*/
errval
st_write_filemarks(unit, number, flags)
u_int32 unit, flags;
int32 number;
{
struct scsi_write_filemarks scsi_cmd;
struct st_data *st = st_data[unit];
/*
* It's hard to write a negative number of file marks.
* Don't try.
*/
if (number < 0) {
return EINVAL;
}
switch ((int)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(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = WRITE_FILEMARKS;
lto3b(number, scsi_cmd.number);
return scsi_scsi_cmd(st->sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
0, /* no retries, just fail */
100000, /* 10 secs.. (may need to repos head ) */
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.
*/
int32
st_chkeod(unit, position, nmarks, flags)
u_int32 unit;
boolean position;
int32 *nmarks;
u_int32 flags;
{
errval error;
struct st_data *st = st_data[unit];
switch ((int)(st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD))) {
default:
*nmarks = 0;
return (ESUCCESS);
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(unit, *nmarks, flags);
if (position && (error == ESUCCESS))
error = st_space(unit, -*nmarks, SP_FILEMARKS, flags);
return (error);
}
/*
* load/unload (with retension if true)
*/
errval
st_load(unit, type, flags)
u_int32 unit, type, flags;
{
struct scsi_load scsi_cmd;
struct st_data *st = st_data[unit];
struct scsi_link *sc_link = st->sc_link;
bzero(&scsi_cmd, sizeof(scsi_cmd));
if (type != LD_LOAD) {
errval error;
int32 nmarks;
error = st_chkeod(unit, FALSE, &nmarks, flags);
if (error != ESUCCESS)
return (error);
sc_link->flags &= ~SDEV_MEDIA_LOADED;
}
if (st->quirks & ST_Q_IGNORE_LOADS)
return (0);
scsi_cmd.op_code = LOAD_UNLOAD;
scsi_cmd.how |= type;
return (scsi_scsi_cmd(st->sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
ST_RETRIES,
300000, /* 5 min */
NULL,
flags));
}
/*
* Rewind the device
*/
errval
st_rewind(unit, immed, flags)
u_int32 unit, flags;
boolean immed;
{
struct scsi_rewind scsi_cmd;
struct st_data *st = st_data[unit];
errval error;
int32 nmarks;
error = st_chkeod(unit, FALSE, &nmarks, flags);
if (error != ESUCCESS)
return (error);
st->flags &= ~ST_PER_ACTION;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = REWIND;
scsi_cmd.byte2 = immed ? SR_IMMED : 0;
return (scsi_scsi_cmd(st->sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
ST_RETRIES,
immed ? 5000 : 300000, /* 5 sec or 5 min */
NULL,
flags));
}
#ifdef NETBSD
#define SIGNAL_SHORT_READ
#else
#define SIGNAL_SHORT_READ bp->b_flags |= B_ERROR;
#endif
/*
* Look at the returned sense and act on the error and detirmine
* The unix error number to pass back... (0 = report no error)
* (-1 = continue processing)
*/
errval
st_interpret_sense(xs)
struct scsi_xfer *xs;
{
struct scsi_link *sc_link = xs->sc_link;
struct scsi_sense_data *sense = &(xs->sense);
boolean silent = xs->flags & SCSI_SILENT;
struct buf *bp = xs->bp;
u_int32 unit = sc_link->dev_unit;
struct st_data *st = st_data[unit];
u_int32 key;
int32 info;
/*
* Get the sense fields and work out what code
*/
if (sense->error_code & SSD_ERRCODE_VALID) {
info = ntohl(*((int32 *) sense->ext.extended.info));
} else {
info = xs->datalen; /* bad choice if fixed blocks */
}
if ((sense->error_code & SSD_ERRCODE) != 0x70) {
return (-1); /* let the generic code handle it */
}
if (st->flags & ST_FIXEDBLOCKS) {
xs->resid = info * st->blksiz;
if (sense->ext.extended.flags & SSD_EOM) {
st->flags |= ST_EIO_PENDING;
if (bp) {
bp->b_resid = xs->resid;
SIGNAL_SHORT_READ
}
}
if (sense->ext.extended.flags & SSD_FILEMARK) {
st->flags |= ST_AT_FILEMARK;
if (bp) {
bp->b_resid = xs->resid;
SIGNAL_SHORT_READ
}
}
if (sense->ext.extended.flags & SSD_ILI) {
st->flags |= ST_EIO_PENDING;
if (bp) {
bp->b_resid = xs->resid;
SIGNAL_SHORT_READ
}
if (sense->error_code & SSD_ERRCODE_VALID &&
!silent)
printf("st%d: block wrong size"
", %d blocks residual\n", unit
,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_SNS_HLP) &&
!(sc_link->flags & SDEV_MEDIA_LOADED)) {
st->blksiz -= 512;
}
}
/*
* If no data was tranfered, do it immediatly
*/
if (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;
SIGNAL_SHORT_READ
}
return 0;
}
}
} else { /* must be variable mode */
xs->resid = xs->datalen; /* to be sure */
if (sense->ext.extended.flags & SSD_EOM) {
return (EIO);
}
if (sense->ext.extended.flags & SSD_FILEMARK) {
if (bp)
bp->b_resid = bp->b_bcount;
return 0;
}
if (sense->ext.extended.flags & SSD_ILI) {
if (info < 0) {
/*
* the record was bigger than the read
*/
if (!silent)
printf("st%d: %d-byte record "
"too big\n", unit,
xs->datalen - info);
return (EIO);
}
xs->resid = info;
if (bp) {
bp->b_resid = info;
SIGNAL_SHORT_READ
}
}
}
key = sense->ext.extended.flags & SSD_KEY;
if (key == 0x8) {
/*
* 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_SNS_HLP) &&
!(sc_link->flags & SDEV_MEDIA_LOADED)) { /* still starting */
st->blksiz -= 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 */
}
return (ESUCCESS);
}
}
return (-1); /* let the default/generic handler handle it */
}
/*
* 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.
*/
errval
st_touch_tape(unit)
u_int32 unit;
{
struct st_data *st = st_data[unit];
char *buf;
u_int32 readsiz;
errval errno;
buf = malloc(1024, M_TEMP, M_NOWAIT);
if (!buf)
return (ENOMEM);
if (errno = st_mode_sense(unit, 0)) {
goto bad;
}
st->blksiz = 1024;
do {
switch ((int)st->blksiz) {
case 512:
case 1024:
readsiz = st->blksiz;
st->flags |= ST_FIXEDBLOCKS;
break;
default:
readsiz = 1;
st->flags &= ~ST_FIXEDBLOCKS;
} if (errno = st_mode_select(unit, 0)) {
goto bad;
}
st_read(unit, buf, readsiz, SCSI_SILENT);
if (errno = st_rewind(unit, FALSE, 0)) {
bad: free(buf, M_TEMP);
return (errno);
}
} while (readsiz != 1 && readsiz > st->blksiz);
free(buf, M_TEMP);
return 0;
}
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