1 /* $OpenBSD: st.c,v 1.75 2007/06/06 17:15:14 deraadt Exp $ */
2 /* $NetBSD: st.c,v 1.71 1997/02/21 23:03:49 thorpej Exp $ */
3
4 /*
5 * Copyright (c) 1994 Charles Hannum. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Charles Hannum.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * Originally written by Julian Elischer (julian@tfs.com)
35 * for TRW Financial Systems for use under the MACH(2.5) operating system.
36 *
37 * TRW Financial Systems, in accordance with their agreement with Carnegie
38 * Mellon University, makes this software available to CMU to distribute
39 * or use in any manner that they see fit as long as this message is kept with
40 * the software. For this reason TFS also grants any other persons or
41 * organisations permission to use or modify this software.
42 *
43 * TFS supplies this software to be publicly redistributed
44 * on the understanding that TFS is not responsible for the correct
45 * functioning of this software in any circumstances.
46 *
47 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
48 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993
49 */
50
51 /*
52 * To do:
53 * work out some better way of guessing what a good timeout is going
54 * to be depending on whether we expect to retension or not.
55 */
56
57 #include <sys/types.h>
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/timeout.h>
61 #include <sys/fcntl.h>
62 #include <sys/errno.h>
63 #include <sys/ioctl.h>
64 #include <sys/stat.h>
65 #include <sys/malloc.h>
66 #include <sys/buf.h>
67 #include <sys/proc.h>
68 #include <sys/user.h>
69 #include <sys/mtio.h>
70 #include <sys/device.h>
71 #include <sys/conf.h>
72
73 #include <scsi/scsi_all.h>
74 #include <scsi/scsi_tape.h>
75 #include <scsi/scsiconf.h>
76
77 /* Defines for device specific stuff */
78 #define DEF_FIXED_BSIZE 512
79 #define ST_RETRIES 4 /* only on non IO commands */
80
81 #define STMODE(z) ( minor(z) & 0x03)
82 #define STUNIT(z) ((minor(z) >> 4) )
83
84 #define ST_IO_TIME (3 * 60 * 1000) /* 3 minutes */
85 #define ST_CTL_TIME (30 * 1000) /* 30 seconds */
86 #define ST_SPC_TIME (4 * 60 * 60 * 1000) /* 4 hours */
87
88 /*
89 * Maximum density code allowed in SCSI spec (SSC2R08f, Section 8.3).
90 */
91 #define SCSI_MAX_DENSITY_CODE 0xff
92
93 /*
94 * Define various devices that we know mis-behave in some way,
95 * and note how they are bad, so we can correct for them
96 */
97 struct modes {
98 u_int quirks; /* same definitions as in quirkdata */
99 int blksize;
100 u_int8_t density;
101 };
102
103 struct quirkdata {
104 u_int quirks;
105 #define ST_Q_FORCE_BLKSIZE 0x0001
106 #define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */
107 #define ST_Q_IGNORE_LOADS 0x0004
108 #define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */
109 #define ST_Q_UNIMODAL 0x0010 /* unimode drive rejects mode select */
110 struct modes modes;
111 };
112
113 struct st_quirk_inquiry_pattern {
114 struct scsi_inquiry_pattern pattern;
115 struct quirkdata quirkdata;
116 };
117
118 const struct st_quirk_inquiry_pattern st_quirk_patterns[] = {
119 {{T_SEQUENTIAL, T_REMOV,
120 " ", " ", " "}, {0,
121 {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */
122 {{T_SEQUENTIAL, T_REMOV,
123 "TANDBERG", " TDC 3600 ", ""}, {0,
124 {0, 0, 0}}}, /* minor 0-3 */
125 {{T_SEQUENTIAL, T_REMOV,
126 "TANDBERG", " TDC 3800 ", ""}, {0,
127 {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */
128 /*
129 * At least -005 and -007 need this. I'll assume they all do unless I
130 * hear otherwise. - mycroft, 31MAR1994
131 */
132 {{T_SEQUENTIAL, T_REMOV,
133 "ARCHIVE ", "VIPER 2525 25462", ""}, {0,
134 {ST_Q_SENSE_HELP, 0, 0}}}, /* minor 0-3 */
135 /*
136 * One user reports that this works for his tape drive. It probably
137 * needs more work. - mycroft, 09APR1994
138 */
139 {{T_SEQUENTIAL, T_REMOV,
140 "SANKYO ", "CP525 ", ""}, {0,
141 {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */
142 {{T_SEQUENTIAL, T_REMOV,
143 "ANRITSU ", "DMT780 ", ""}, {0,
144 {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */
145 {{T_SEQUENTIAL, T_REMOV,
146 "ARCHIVE ", "VIPER 150 21247", ""}, {0,
147 {0, 0, 0}}}, /* minor 0-3 */
148 {{T_SEQUENTIAL, T_REMOV,
149 "ARCHIVE ", "VIPER 150 21531", ""}, {0,
150 {ST_Q_SENSE_HELP, 0, 0}}}, /* minor 0-3 */
151 {{T_SEQUENTIAL, T_REMOV,
152 "WANGTEK ", "5099ES SCSI", ""}, {0,
153 {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */
154 {{T_SEQUENTIAL, T_REMOV,
155 "WANGTEK ", "5150ES SCSI", ""}, {0,
156 {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */
157 {{T_SEQUENTIAL, T_REMOV,
158 "WANGTEK ", "5525ES SCSI REV7", ""}, {0,
159 {0, 0, 0}}}, /* minor 0-3 */
160 {{T_SEQUENTIAL, T_REMOV,
161 "WangDAT ", "Model 1300 ", ""}, {0,
162 {0, 0, 0}}}, /* minor 0-3 */
163 {{T_SEQUENTIAL, T_REMOV,
164 "EXABYTE ", "EXB-8200 ", "263H"}, {0,
165 {0, 0, 0}}}, /* minor 0-3 */
166 {{T_SEQUENTIAL, T_REMOV,
167 "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL,
168 {0, 0, QIC_3095}}}, /* minor 0-3 */
169 #if 0
170 {{T_SEQUENTIAL, T_REMOV,
171 "EXABYTE ", "EXB-8200 ", ""}, {0,
172 {0, 0, 0}}}, /* minor 0-3 */
173 #endif
174 {{T_SEQUENTIAL, T_REMOV,
175 "WANGTEK ", "5150ES SCSI FA15\0""01 A", "????"}, {0,
176 {ST_Q_IGNORE_LOADS, 0, 0}}}, /* minor 0-3 */
177 {{T_SEQUENTIAL, T_REMOV,
178 "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS,
179 {0, 0, 0}}}, /* minor 0-3 */
180 };
181
182 #define NOEJECT 0
183 #define EJECT 1
184
185 #define NOREWIND 0
186 #define DOREWIND 1
187
188 struct st_softc {
189 struct device sc_dev;
190 /*--------------------present operating parameters, flags etc.----------------*/
191 int flags; /* see below */
192 u_int quirks; /* quirks for the open mode */
193 int blksize; /* blksize we are using */
194 u_int8_t density; /* present density */
195 short mt_resid; /* last (short) resid */
196 short mt_erreg; /* last error (sense key) seen */
197 /*--------------------device/scsi parameters----------------------------------*/
198 struct scsi_link *sc_link; /* our link to the adpter etc. */
199 /*--------------------parameters reported by the device ----------------------*/
200 int blkmin; /* min blk size */
201 int blkmax; /* max blk size */
202 const struct quirkdata *quirkdata; /* if we have a rogue entry */
203 /*--------------------parameters reported by the device for this media--------*/
204 u_int64_t numblks; /* nominal blocks capacity */
205 u_int32_t media_blksize; /* 0 if not ST_FIXEDBLOCKS */
206 u_int32_t media_density; /* this is what it said when asked */
207 int media_fileno; /* relative to BOT. -1 means unknown. */
208 int media_blkno; /* relative to BOF. -1 means unknown. */
209 /*--------------------quirks for the whole drive------------------------------*/
210 u_int drive_quirks; /* quirks of this drive */
211 /*--------------------How we should set up when opening each minor device----*/
212 struct modes modes; /* plus more for each mode */
213 u_int8_t modeflags; /* flags for the modes */
214 #define DENSITY_SET_BY_USER 0x01
215 #define DENSITY_SET_BY_QUIRK 0x02
216 #define BLKSIZE_SET_BY_USER 0x04
217 #define BLKSIZE_SET_BY_QUIRK 0x08
218 /*--------------------storage for sense data returned by the drive------------*/
219 struct buf buf_queue; /* the queue of pending IO operations */
220 struct timeout sc_timeout;
221 };
222
223
224 int stmatch(struct device *, void *, void *);
225 void stattach(struct device *, struct device *, void *);
226 void st_identify_drive(struct st_softc *, struct scsi_inquiry_data *);
227 void st_loadquirks(struct st_softc *);
228 int st_mount_tape(dev_t, int);
229 void st_unmount(struct st_softc *, int, int);
230 int st_decide_mode(struct st_softc *, int);
231 void ststart(void *);
232 void strestart(void *);
233 int st_read(struct st_softc *, char *, int, int);
234 int st_read_block_limits(struct st_softc *, int);
235 int st_mode_sense(struct st_softc *, int);
236 int st_mode_select(struct st_softc *, int);
237 int st_space(struct st_softc *, int, u_int, int);
238 int st_write_filemarks(struct st_softc *, int, int);
239 int st_check_eod(struct st_softc *, int, int *, int);
240 int st_load(struct st_softc *, u_int, int);
241 int st_rewind(struct st_softc *, u_int, int);
242 int st_interpret_sense(struct scsi_xfer *);
243 int st_touch_tape(struct st_softc *);
244 int st_erase(struct st_softc *, int, int);
245
246 struct cfattach st_ca = {
247 sizeof(struct st_softc), stmatch, stattach
248 };
249
250 struct cfdriver st_cd = {
251 NULL, "st", DV_TAPE
252 };
253
254 struct scsi_device st_switch = {
255 st_interpret_sense,
256 ststart,
257 NULL,
258 NULL,
259 };
260
261 #define ST_INFO_VALID 0x0001
262 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */
263 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */
264 #define ST_FIXEDBLOCKS 0x0008
265 #define ST_AT_FILEMARK 0x0010
266 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */
267 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */
268 #define ST_FM_WRITTEN 0x0100 /*
269 * EOF file mark written -- used with
270 * ~ST_WRITTEN to indicate that multiple file
271 * marks have been written
272 */
273 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */
274 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */
275 #define ST_MOUNTED 0x0800 /* Device is presently mounted */
276 #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */
277
278 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ)
279 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \
280 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \
281 ST_2FM_AT_EOD | ST_PER_ACTION)
282
283 const struct scsi_inquiry_pattern st_patterns[] = {
284 {T_SEQUENTIAL, T_REMOV,
285 "", "", ""},
286 };
287
288 int
289 stmatch(parent, match, aux)
290 struct device *parent;
291 void *match, *aux;
292 {
293 struct scsi_attach_args *sa = aux;
294 int priority;
295
296 (void)scsi_inqmatch(sa->sa_inqbuf,
297 st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]),
298 sizeof(st_patterns[0]), &priority);
299 return (priority);
300 }
301
302 /*
303 * The routine called by the low level scsi routine when it discovers
304 * A device suitable for this driver
305 */
306 void
307 stattach(parent, self, aux)
308 struct device *parent, *self;
309 void *aux;
310 {
311 struct st_softc *st = (void *)self;
312 struct scsi_attach_args *sa = aux;
313 struct scsi_link *sc_link = sa->sa_sc_link;
314
315 SC_DEBUG(sc_link, SDEV_DB2, ("stattach:\n"));
316
317 /*
318 * Store information needed to contact our base driver
319 */
320 st->sc_link = sc_link;
321 sc_link->device = &st_switch;
322 sc_link->device_softc = st;
323
324 /*
325 * Check if the drive is a known criminal and take
326 * Any steps needed to bring it into line
327 */
328 st_identify_drive(st, sa->sa_inqbuf);
329 printf("\n");
330
331 timeout_set(&st->sc_timeout, strestart, st);
332
333 /*
334 * Set up the buf queue for this device
335 */
336 st->buf_queue.b_active = 0;
337 st->buf_queue.b_actf = 0;
338 st->buf_queue.b_actb = &st->buf_queue.b_actf;
339
340 /* Start up with media position unknown. */
341 st->media_fileno = -1;
342 st->media_blkno = -1;
343
344 /*
345 * Reset the media loaded flag, sometimes the data
346 * acquired at boot time is not quite accurate. This
347 * will be checked again at the first open.
348 */
349 sc_link->flags &= ~SDEV_MEDIA_LOADED;
350 }
351
352 /*
353 * Use the inquiry routine in 'scsi_base' to get drive info so we can
354 * Further tailor our behaviour.
355 */
356 void
357 st_identify_drive(st, inqbuf)
358 struct st_softc *st;
359 struct scsi_inquiry_data *inqbuf;
360 {
361 const struct st_quirk_inquiry_pattern *finger;
362 int priority;
363
364 finger = (const struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf,
365 st_quirk_patterns,
366 sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]),
367 sizeof(st_quirk_patterns[0]), &priority);
368 if (priority != 0) {
369 st->quirkdata = &finger->quirkdata;
370 st->drive_quirks = finger->quirkdata.quirks;
371 st->quirks = finger->quirkdata.quirks; /* start value */
372 st_loadquirks(st);
373 }
374 }
375
376 /*
377 * initialise the subdevices to the default (QUIRK) state.
378 * this will remove any setting made by the system operator or previous
379 * operations.
380 */
381 void
382 st_loadquirks(st)
383 struct st_softc *st;
384 {
385 const struct modes *mode;
386 struct modes *mode2;
387
388 mode = &st->quirkdata->modes;
389 mode2 = &st->modes;
390 bzero(mode2, sizeof(struct modes));
391 st->modeflags &= ~(BLKSIZE_SET_BY_QUIRK |
392 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER |
393 DENSITY_SET_BY_USER);
394 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) {
395 mode2->blksize = mode->blksize;
396 st->modeflags |= BLKSIZE_SET_BY_QUIRK;
397 }
398 if (mode->density) {
399 mode2->density = mode->density;
400 st->modeflags |= DENSITY_SET_BY_QUIRK;
401 }
402 }
403
404 /*
405 * open the device.
406 */
407 int
408 stopen(dev, flags, fmt, p)
409 dev_t dev;
410 int flags;
411 int fmt;
412 struct proc *p;
413 {
414 struct scsi_link *sc_link;
415 struct st_softc *st;
416 int error = 0, unit;
417
418 unit = STUNIT(dev);
419 if (unit >= st_cd.cd_ndevs)
420 return (ENXIO);
421 st = st_cd.cd_devs[unit];
422 if (!st)
423 return (ENXIO);
424
425 sc_link = st->sc_link;
426
427 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev,
428 unit, st_cd.cd_ndevs));
429
430 /*
431 * Tape is an exclusive media. Only one open at a time.
432 */
433 if (sc_link->flags & SDEV_OPEN) {
434 SC_DEBUG(sc_link, SDEV_DB4, ("already open\n"));
435 return (EBUSY);
436 }
437
438 /* Use st_interpret_sense() now. */
439 sc_link->flags |= SDEV_OPEN;
440
441 /*
442 * Check the unit status. This clears any outstanding errors and
443 * will ensure that media is present.
444 */
445 error = scsi_test_unit_ready(sc_link, TEST_READY_RETRIES,
446 SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE |
447 SCSI_IGNORE_ILLEGAL_REQUEST);
448
449 /*
450 * Terminate any exising mount session if there is no media.
451 */
452 if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0)
453 st_unmount(st, NOEJECT, DOREWIND);
454
455 if (error) {
456 sc_link->flags &= ~SDEV_OPEN;
457 return (error);
458 }
459
460 if ((st->flags & ST_MOUNTED) == 0) {
461 error = st_mount_tape(dev, flags);
462 if (error) {
463 sc_link->flags &= ~SDEV_OPEN;
464 return (error);
465 }
466 }
467
468 /*
469 * Make sure that a tape opened in write-only mode will have
470 * file marks written on it when closed, even if not written to.
471 * This is for SUN compatibility
472 */
473 if ((flags & O_ACCMODE) == FWRITE)
474 st->flags |= ST_WRITTEN;
475
476 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n"));
477 return (0);
478 }
479
480 /*
481 * close the device.. only called if we are the LAST
482 * occurence of an open device
483 */
484 int
485 stclose(dev, flags, mode, p)
486 dev_t dev;
487 int flags;
488 int mode;
489 struct proc *p;
490 {
491 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)];
492
493 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n"));
494 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN)
495 st_write_filemarks(st, 1, 0);
496 switch (STMODE(dev)) {
497 case 0: /* normal */
498 st_unmount(st, NOEJECT, DOREWIND);
499 break;
500 case 3: /* eject, no rewind */
501 st_unmount(st, EJECT, NOREWIND);
502 break;
503 case 1: /* no rewind */
504 /* leave mounted unless media seems to have been removed */
505 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED))
506 st_unmount(st, NOEJECT, NOREWIND);
507 break;
508 case 2: /* rewind, eject */
509 st_unmount(st, EJECT, DOREWIND);
510 break;
511 }
512 st->sc_link->flags &= ~SDEV_OPEN;
513 timeout_del(&st->sc_timeout);
514
515 return 0;
516 }
517
518 /*
519 * Start a new mount session.
520 * Copy in all the default parameters from the selected device mode.
521 * and try guess any that seem to be defaulted.
522 */
523 int
524 st_mount_tape(dev, flags)
525 dev_t dev;
526 int flags;
527 {
528 int unit;
529 u_int mode;
530 struct st_softc *st;
531 struct scsi_link *sc_link;
532 int error = 0;
533
534 unit = STUNIT(dev);
535 mode = STMODE(dev);
536 st = st_cd.cd_devs[unit];
537 sc_link = st->sc_link;
538
539 if (st->flags & ST_MOUNTED)
540 return 0;
541
542 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n"));
543 st->quirks = st->drive_quirks | st->modes.quirks;
544 /*
545 * If the media is new, then make sure we give it a chance to
546 * to do a 'load' instruction. (We assume it is new.)
547 */
548 if ((error = st_load(st, LD_LOAD, 0)) != 0)
549 return error;
550 /*
551 * Throw another dummy instruction to catch
552 * 'Unit attention' errors. Some drives appear to give
553 * these after doing a Load instruction.
554 * (noteably some DAT drives)
555 */
556 /* XXX */
557 scsi_test_unit_ready(sc_link, TEST_READY_RETRIES, SCSI_SILENT);
558
559 /*
560 * Some devices can't tell you much until they have been
561 * asked to look at the media. This quirk does this.
562 */
563 if (st->quirks & ST_Q_SENSE_HELP)
564 if ((error = st_touch_tape(st)) != 0)
565 return error;
566 /*
567 * Load the physical device parameters
568 * loads: blkmin, blkmax
569 */
570 if (!(sc_link->flags & SDEV_ATAPI) &&
571 (error = st_read_block_limits(st, 0)) != 0) {
572 return error;
573 }
574
575 /*
576 * Load the media dependent parameters
577 * includes: media_blksize,media_density,numblks
578 * As we have a tape in, it should be reflected here.
579 * If not you may need the "quirk" above.
580 */
581 if ((error = st_mode_sense(st, 0)) != 0)
582 return error;
583
584 /*
585 * If we have gained a permanent density from somewhere,
586 * then use it in preference to the one supplied by
587 * default by the driver.
588 */
589 if (st->modeflags & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER))
590 st->density = st->modes.density;
591 else
592 st->density = st->media_density;
593 /*
594 * If we have gained a permanent blocksize
595 * then use it in preference to the one supplied by
596 * default by the driver.
597 */
598 st->flags &= ~ST_FIXEDBLOCKS;
599 if (st->modeflags & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) {
600 st->blksize = st->modes.blksize;
601 if (st->blksize)
602 st->flags |= ST_FIXEDBLOCKS;
603 } else {
604 if ((error = st_decide_mode(st, FALSE)) != 0)
605 return error;
606 }
607 if ((error = st_mode_select(st, 0)) != 0) {
608 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname);
609 return error;
610 }
611 scsi_prevent(sc_link, PR_PREVENT,
612 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY);
613 st->flags |= ST_MOUNTED;
614 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */
615
616 return 0;
617 }
618
619 /*
620 * End the present mount session.
621 * Rewind, and optionally eject the tape.
622 * Reset various flags to indicate that all new
623 * operations require another mount operation
624 */
625 void
626 st_unmount(st, eject, rewind)
627 struct st_softc *st;
628 int eject, rewind;
629 {
630 struct scsi_link *sc_link = st->sc_link;
631 int nmarks;
632
633 st->media_fileno = -1;
634 st->media_blkno = -1;
635
636 if (!(st->flags & ST_MOUNTED))
637 return;
638 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n"));
639 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY);
640 if (rewind)
641 st_rewind(st, 0, SCSI_IGNORE_NOT_READY);
642 scsi_prevent(sc_link, PR_ALLOW,
643 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY);
644 if (eject)
645 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY);
646 st->flags &= ~ST_MOUNTED;
647 sc_link->flags &= ~SDEV_MEDIA_LOADED;
648 }
649
650 /*
651 * Given all we know about the device, media, mode, 'quirks' and
652 * initial operation, make a decision as to how we should be set
653 * to run (regarding blocking and EOD marks)
654 */
655 int
656 st_decide_mode(st, first_read)
657 struct st_softc *st;
658 int first_read;
659 {
660 struct scsi_link *sc_link = st->sc_link;
661
662 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n"));
663
664 /* ATAPI tapes are always fixed blocksize. */
665 if (sc_link->flags & SDEV_ATAPI) {
666 st->flags |= ST_FIXEDBLOCKS;
667 if (st->media_blksize > 0)
668 st->blksize = st->media_blksize;
669 else
670 st->blksize = DEF_FIXED_BSIZE;
671 goto done;
672 }
673
674 /*
675 * If the drive can only handle fixed-length blocks and only at
676 * one size, perhaps we should just do that.
677 */
678 if (st->blkmin && (st->blkmin == st->blkmax)) {
679 st->flags |= ST_FIXEDBLOCKS;
680 st->blksize = st->blkmin;
681 SC_DEBUG(sc_link, SDEV_DB3,
682 ("blkmin == blkmax of %d\n", st->blkmin));
683 goto done;
684 }
685 /*
686 * If the tape density mandates (or even suggests) use of fixed
687 * or variable-length blocks, comply.
688 */
689 switch (st->density) {
690 case HALFINCH_800:
691 case HALFINCH_1600:
692 case HALFINCH_6250:
693 case DDS:
694 st->flags &= ~ST_FIXEDBLOCKS;
695 st->blksize = 0;
696 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n"));
697 goto done;
698 case QIC_11:
699 case QIC_24:
700 case QIC_120:
701 case QIC_150:
702 case QIC_525:
703 case QIC_1320:
704 st->flags |= ST_FIXEDBLOCKS;
705 if (st->media_blksize > 0)
706 st->blksize = st->media_blksize;
707 else
708 st->blksize = DEF_FIXED_BSIZE;
709 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n"));
710 goto done;
711 }
712 /*
713 * If we're about to read the tape, perhaps we should choose
714 * fixed or variable-length blocks and block size according to
715 * what the drive found on the tape.
716 */
717 if (first_read &&
718 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) ||
719 (st->media_blksize == DEF_FIXED_BSIZE) ||
720 (st->media_blksize == 1024))) {
721 if (st->media_blksize > 0)
722 st->flags |= ST_FIXEDBLOCKS;
723 else
724 st->flags &= ~ST_FIXEDBLOCKS;
725 st->blksize = st->media_blksize;
726 SC_DEBUG(sc_link, SDEV_DB3,
727 ("Used media_blksize of %d\n", st->media_blksize));
728 goto done;
729 }
730 /*
731 * We're getting no hints from any direction. Choose variable-
732 * length blocks arbitrarily.
733 */
734 st->flags &= ~ST_FIXEDBLOCKS;
735 st->blksize = 0;
736 SC_DEBUG(sc_link, SDEV_DB3,
737 ("Give up and default to variable mode\n"));
738
739 done:
740 /*
741 * Decide whether or not to write two file marks to signify end-
742 * of-data. Make the decision as a function of density. If
743 * the decision is not to use a second file mark, the SCSI BLANK
744 * CHECK condition code will be recognized as end-of-data when
745 * first read.
746 * (I think this should be a by-product of fixed/variable..julian)
747 */
748 switch (st->density) {
749 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */
750 case QIC_11:
751 case QIC_24:
752 case QIC_120:
753 case QIC_150:
754 case QIC_525:
755 case QIC_1320:
756 st->flags &= ~ST_2FM_AT_EOD;
757 break;
758 default:
759 st->flags |= ST_2FM_AT_EOD;
760 }
761 return 0;
762 }
763
764 /*
765 * Actually translate the requested transfer into
766 * one the physical driver can understand
767 * The transfer is described by a buf and will include
768 * only one physical transfer.
769 */
770 void
771 ststrategy(bp)
772 struct buf *bp;
773 {
774 struct st_softc *st = st_cd.cd_devs[STUNIT(bp->b_dev)];
775 struct buf *dp;
776 int s;
777
778 SC_DEBUG(st->sc_link, SDEV_DB2, ("ststrategy: %ld bytes @ blk %d\n",
779 bp->b_bcount, bp->b_blkno));
780 /*
781 * If it's a null transfer, return immediately.
782 */
783 if (bp->b_bcount == 0)
784 goto done;
785 /*
786 * Odd sized request on fixed drives are verboten
787 */
788 if (st->flags & ST_FIXEDBLOCKS) {
789 if (bp->b_bcount % st->blksize) {
790 printf("%s: bad request, must be multiple of %d\n",
791 st->sc_dev.dv_xname, st->blksize);
792 bp->b_error = EIO;
793 goto bad;
794 }
795 }
796 /*
797 * as are out-of-range requests on variable drives.
798 */
799 else if (bp->b_bcount < st->blkmin ||
800 (st->blkmax && bp->b_bcount > st->blkmax)) {
801 printf("%s: bad request, must be between %d and %d\n",
802 st->sc_dev.dv_xname, st->blkmin, st->blkmax);
803 bp->b_error = EIO;
804 goto bad;
805 }
806 s = splbio();
807
808 /*
809 * Place it in the queue of activities for this tape
810 * at the end (a bit silly because we only have on user..
811 * (but it could fork()))
812 */
813 dp = &st->buf_queue;
814 bp->b_actf = NULL;
815 bp->b_actb = dp->b_actb;
816 *dp->b_actb = bp;
817 dp->b_actb = &bp->b_actf;
818
819 /*
820 * Tell the device to get going on the transfer if it's
821 * not doing anything, otherwise just wait for completion
822 * (All a bit silly if we're only allowing 1 open but..)
823 */
824 ststart(st);
825
826 splx(s);
827 return;
828 bad:
829 bp->b_flags |= B_ERROR;
830 done:
831 /*
832 * Correctly set the buf to indicate a completed xfer
833 */
834 bp->b_resid = bp->b_bcount;
835 s = splbio();
836 biodone(bp);
837 splx(s);
838 }
839
840 /*
841 * ststart looks to see if there is a buf waiting for the device
842 * and that the device is not already busy. If both are true,
843 * It dequeues the buf and creates a scsi command to perform the
844 * transfer required. The transfer request will call scsi_done
845 * on completion, which will in turn call this routine again
846 * so that the next queued transfer is performed.
847 * The bufs are queued by the strategy routine (ststrategy)
848 *
849 * This routine is also called after other non-queued requests
850 * have been made of the scsi driver, to ensure that the queue
851 * continues to be drained.
852 * ststart() is called at splbio from ststrategy, strestart and scsi_done()
853 */
854 void
855 ststart(v)
856 void *v;
857 {
858 struct st_softc *st = v;
859 struct scsi_link *sc_link = st->sc_link;
860 struct buf *bp, *dp;
861 struct scsi_rw_tape cmd;
862 int flags, error;
863
864 SC_DEBUG(sc_link, SDEV_DB2, ("ststart\n"));
865
866 splassert(IPL_BIO);
867
868 /*
869 * See if there is a buf to do and we are not already
870 * doing one
871 */
872 while (sc_link->openings > 0) {
873 /* if a special awaits, let it proceed first */
874 if (sc_link->flags & SDEV_WAITING) {
875 sc_link->flags &= ~SDEV_WAITING;
876 wakeup((caddr_t)sc_link);
877 return;
878 }
879
880 dp = &st->buf_queue;
881 if ((bp = dp->b_actf) == NULL)
882 return;
883 if ((dp = bp->b_actf) != NULL)
884 dp->b_actb = bp->b_actb;
885 else
886 st->buf_queue.b_actb = bp->b_actb;
887 *bp->b_actb = dp;
888
889 /*
890 * if the device has been unmounted by the user
891 * then throw away all requests until done
892 */
893 if (!(st->flags & ST_MOUNTED) ||
894 !(sc_link->flags & SDEV_MEDIA_LOADED)) {
895 /* make sure that one implies the other.. */
896 sc_link->flags &= ~SDEV_MEDIA_LOADED;
897 bp->b_flags |= B_ERROR;
898 bp->b_resid = bp->b_bcount;
899 bp->b_error = EIO;
900 biodone(bp);
901 continue;
902 }
903 /*
904 * only FIXEDBLOCK devices have pending operations
905 */
906 if (st->flags & ST_FIXEDBLOCKS) {
907 /*
908 * If we are at a filemark but have not reported it yet
909 * then we should report it now
910 */
911 if (st->flags & ST_AT_FILEMARK) {
912 if ((bp->b_flags & B_READ) == B_WRITE) {
913 /*
914 * Handling of ST_AT_FILEMARK in
915 * st_space will fill in the right file
916 * mark count.
917 * Back up over filemark
918 */
919 if (st_space(st, 0, SP_FILEMARKS, 0)) {
920 bp->b_flags |= B_ERROR;
921 bp->b_resid = bp->b_bcount;
922 bp->b_error = EIO;
923 biodone(bp);
924 continue;
925 }
926 } else {
927 bp->b_resid = bp->b_bcount;
928 bp->b_error = 0;
929 bp->b_flags &= ~B_ERROR;
930 st->flags &= ~ST_AT_FILEMARK;
931 biodone(bp);
932 continue; /* seek more work */
933 }
934 }
935 /*
936 * If we are at EIO (e.g. EOM) but have not reported it
937 * yet then we should report it now
938 */
939 if (st->flags & ST_EIO_PENDING) {
940 bp->b_resid = bp->b_bcount;
941 bp->b_error = EIO;
942 bp->b_flags |= B_ERROR;
943 st->flags &= ~ST_EIO_PENDING;
944 biodone(bp);
945 continue; /* seek more work */
946 }
947 }
948
949 /*
950 * Fill out the scsi command
951 */
952 bzero(&cmd, sizeof(cmd));
953 if ((bp->b_flags & B_READ) == B_WRITE) {
954 cmd.opcode = WRITE;
955 st->flags &= ~ST_FM_WRITTEN;
956 st->flags |= ST_WRITTEN;
957 flags = SCSI_DATA_OUT;
958 } else {
959 cmd.opcode = READ;
960 flags = SCSI_DATA_IN;
961 }
962
963 /*
964 * Handle "fixed-block-mode" tape drives by using the
965 * block count instead of the length.
966 */
967 if (st->flags & ST_FIXEDBLOCKS) {
968 cmd.byte2 |= SRW_FIXED;
969 _lto3b(bp->b_bcount / st->blksize, cmd.len);
970 } else
971 _lto3b(bp->b_bcount, cmd.len);
972
973 if (st->media_blkno != -1) {
974 /* Update block count now, errors will set it to -1. */
975 if (st->flags & ST_FIXEDBLOCKS)
976 st->media_blkno += _3btol(cmd.len);
977 else if (cmd.len != 0)
978 st->media_blkno++;
979 }
980
981 /*
982 * go ask the adapter to do all this for us
983 */
984 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd,
985 sizeof(cmd), (u_char *) bp->b_data, bp->b_bcount, 0,
986 ST_IO_TIME, bp, flags | SCSI_NOSLEEP);
987 switch (error) {
988 case 0:
989 timeout_del(&st->sc_timeout);
990 break;
991 case EAGAIN:
992 /*
993 * The device can't start another i/o. Try again later.
994 */
995 dp->b_actf = bp;
996 timeout_add(&st->sc_timeout, 1);
997 return;
998 default:
999 printf("%s: not queued\n", st->sc_dev.dv_xname);
1000 break;
1001 }
1002 } /* go back and see if we can cram more work in.. */
1003 }
1004
1005 void
1006 strestart(v)
1007 void *v;
1008 {
1009 int s;
1010
1011 s = splbio();
1012 ststart(v);
1013 splx(s);
1014 }
1015
1016 int
1017 stread(dev, uio, iomode)
1018 dev_t dev;
1019 struct uio *uio;
1020 int iomode;
1021 {
1022 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)];
1023
1024 return (physio(ststrategy, NULL, dev, B_READ,
1025 st->sc_link->adapter->scsi_minphys, uio));
1026 }
1027
1028 int
1029 stwrite(dev, uio, iomode)
1030 dev_t dev;
1031 struct uio *uio;
1032 int iomode;
1033 {
1034 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)];
1035
1036 return (physio(ststrategy, NULL, dev, B_WRITE,
1037 st->sc_link->adapter->scsi_minphys, uio));
1038 }
1039
1040 /*
1041 * Perform special action on behalf of the user;
1042 * knows about the internals of this device
1043 */
1044 int
1045 stioctl(dev, cmd, arg, flag, p)
1046 dev_t dev;
1047 u_long cmd;
1048 caddr_t arg;
1049 int flag;
1050 struct proc *p;
1051 {
1052 int error = 0;
1053 int unit;
1054 int nmarks;
1055 int flags;
1056 struct st_softc *st;
1057 int hold_blksize;
1058 u_int8_t hold_density;
1059 struct mtop *mt = (struct mtop *) arg;
1060 int number;
1061
1062 /*
1063 * Find the device that the user is talking about
1064 */
1065 flags = 0; /* give error messages, act on errors etc. */
1066 unit = STUNIT(dev);
1067 st = st_cd.cd_devs[unit];
1068 hold_blksize = st->blksize;
1069 hold_density = st->density;
1070
1071 switch (cmd) {
1072
1073 case MTIOCGET: {
1074 struct mtget *g = (struct mtget *) arg;
1075
1076 /*
1077 * (to get the current state of READONLY)
1078 */
1079 error = st_mode_sense(st, SCSI_SILENT);
1080 if (error)
1081 break;
1082
1083 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n"));
1084 bzero(g, sizeof(struct mtget));
1085 g->mt_type = 0x7; /* Ultrix compat *//*? */
1086 g->mt_blksiz = st->blksize;
1087 g->mt_density = st->density;
1088 g->mt_mblksiz = st->modes.blksize;
1089 g->mt_mdensity = st->modes.density;
1090 if (st->flags & ST_READONLY)
1091 g->mt_dsreg |= MT_DS_RDONLY;
1092 if (st->flags & ST_MOUNTED)
1093 g->mt_dsreg |= MT_DS_MOUNTED;
1094 g->mt_resid = st->mt_resid;
1095 g->mt_erreg = st->mt_erreg;
1096 g->mt_fileno = st->media_fileno;
1097 g->mt_blkno = st->media_blkno;
1098 /*
1099 * clear latched errors.
1100 */
1101 st->mt_resid = 0;
1102 st->mt_erreg = 0;
1103 break;
1104 }
1105 case MTIOCTOP: {
1106
1107 SC_DEBUG(st->sc_link, SDEV_DB1,
1108 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count));
1109
1110 number = mt->mt_count;
1111 switch (mt->mt_op) {
1112 case MTWEOF: /* write an end-of-file record */
1113 error = st_write_filemarks(st, number, flags);
1114 break;
1115 case MTBSF: /* backward space file */
1116 number = -number;
1117 case MTFSF: /* forward space file */
1118 error = st_check_eod(st, FALSE, &nmarks, flags);
1119 if (!error)
1120 error = st_space(st, number - nmarks,
1121 SP_FILEMARKS, flags);
1122 break;
1123 case MTBSR: /* backward space record */
1124 number = -number;
1125 case MTFSR: /* forward space record */
1126 error = st_check_eod(st, TRUE, &nmarks, flags);
1127 if (!error)
1128 error = st_space(st, number, SP_BLKS, flags);
1129 break;
1130 case MTREW: /* rewind */
1131 error = st_rewind(st, 0, flags);
1132 break;
1133 case MTOFFL: /* rewind and put the drive offline */
1134 st_unmount(st, EJECT, DOREWIND);
1135 break;
1136 case MTNOP: /* no operation, sets status only */
1137 break;
1138 case MTRETEN: /* retension the tape */
1139 error = st_load(st, LD_RETENSION, flags);
1140 if (!error)
1141 error = st_load(st, LD_LOAD, flags);
1142 break;
1143 case MTEOM: /* forward space to end of media */
1144 error = st_check_eod(st, FALSE, &nmarks, flags);
1145 if (!error)
1146 error = st_space(st, 1, SP_EOM, flags);
1147 break;
1148 case MTCACHE: /* enable controller cache */
1149 st->flags &= ~ST_DONTBUFFER;
1150 goto try_new_value;
1151 case MTNOCACHE: /* disable controller cache */
1152 st->flags |= ST_DONTBUFFER;
1153 goto try_new_value;
1154 case MTERASE: /* erase volume */
1155 error = st_erase(st, number, flags);
1156 break;
1157 case MTSETBSIZ: /* Set block size for device */
1158 if (number == 0) {
1159 st->flags &= ~ST_FIXEDBLOCKS;
1160 } else {
1161 if ((st->blkmin || st->blkmax) &&
1162 (number < st->blkmin ||
1163 number > st->blkmax)) {
1164 error = EINVAL;
1165 break;
1166 }
1167 st->flags |= ST_FIXEDBLOCKS;
1168 }
1169 st->blksize = number;
1170 st->flags |= ST_BLOCK_SET; /*XXX */
1171 goto try_new_value;
1172
1173 case MTSETDNSTY: /* Set density for device and mode */
1174 if (number < 0 || number > SCSI_MAX_DENSITY_CODE) {
1175 error = EINVAL;
1176 break;
1177 } else
1178 st->density = number;
1179 goto try_new_value;
1180
1181 default:
1182 error = EINVAL;
1183 }
1184 break;
1185 }
1186 case MTIOCIEOT:
1187 case MTIOCEEOT:
1188 break;
1189
1190 #if 0
1191 case MTIOCRDSPOS:
1192 error = st_rdpos(st, 0, (u_int32_t *) arg);
1193 break;
1194
1195 case MTIOCRDHPOS:
1196 error = st_rdpos(st, 1, (u_int32_t *) arg);
1197 break;
1198
1199 case MTIOCSLOCATE:
1200 error = st_setpos(st, 0, (u_int32_t *) arg);
1201 break;
1202
1203 case MTIOCHLOCATE:
1204 error = st_setpos(st, 1, (u_int32_t *) arg);
1205 break;
1206 #endif
1207
1208 default:
1209 error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p);
1210 break;
1211 }
1212 return error;
1213 /*-----------------------------*/
1214 try_new_value:
1215 /*
1216 * Check that the mode being asked for is aggreeable to the
1217 * drive. If not, put it back the way it was.
1218 */
1219 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */
1220 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname);
1221 st->density = hold_density;
1222 st->blksize = hold_blksize;
1223 if (st->blksize)
1224 st->flags |= ST_FIXEDBLOCKS;
1225 else
1226 st->flags &= ~ST_FIXEDBLOCKS;
1227 return error;
1228 }
1229 /*
1230 * As the drive liked it, if we are setting a new default,
1231 * set it into the structures as such.
1232 */
1233 switch (mt->mt_op) {
1234 case MTSETBSIZ:
1235 st->modes.blksize = st->blksize;
1236 st->modeflags |= BLKSIZE_SET_BY_USER;
1237 break;
1238 case MTSETDNSTY:
1239 st->modes.density = st->density;
1240 st->modeflags |= DENSITY_SET_BY_USER;
1241 break;
1242 }
1243
1244 return 0;
1245 }
1246
1247 /*
1248 * Do a synchronous read.
1249 */
1250 int
1251 st_read(st, buf, size, flags)
1252 struct st_softc *st;
1253 int size;
1254 int flags;
1255 char *buf;
1256 {
1257 struct scsi_rw_tape cmd;
1258
1259 /*
1260 * If it's a null transfer, return immediately
1261 */
1262 if (size == 0)
1263 return 0;
1264 bzero(&cmd, sizeof(cmd));
1265 cmd.opcode = READ;
1266 if (st->flags & ST_FIXEDBLOCKS) {
1267 cmd.byte2 |= SRW_FIXED;
1268 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE),
1269 cmd.len);
1270 } else
1271 _lto3b(size, cmd.len);
1272 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd,
1273 sizeof(cmd), (u_char *) buf, size, 0, ST_IO_TIME, NULL,
1274 flags | SCSI_DATA_IN);
1275 }
1276
1277 /*
1278 * Ask the drive what its min and max blk sizes are.
1279 */
1280 int
1281 st_read_block_limits(st, flags)
1282 struct st_softc *st;
1283 int flags;
1284 {
1285 struct scsi_block_limits cmd;
1286 struct scsi_block_limits_data block_limits;
1287 struct scsi_link *sc_link = st->sc_link;
1288 int error;
1289
1290 /*
1291 * First check if we have it all loaded
1292 */
1293 if ((sc_link->flags & SDEV_MEDIA_LOADED))
1294 return 0;
1295
1296 /*
1297 * do a 'Read Block Limits'
1298 */
1299 bzero(&cmd, sizeof(cmd));
1300 cmd.opcode = READ_BLOCK_LIMITS;
1301
1302 /*
1303 * do the command, update the global values
1304 */
1305 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd,
1306 sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits),
1307 ST_RETRIES, ST_CTL_TIME, NULL, flags | SCSI_DATA_IN);
1308 if (error)
1309 return error;
1310
1311 st->blkmin = _2btol(block_limits.min_length);
1312 st->blkmax = _3btol(block_limits.max_length);
1313
1314 SC_DEBUG(sc_link, SDEV_DB3,
1315 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax));
1316 return 0;
1317 }
1318
1319 /*
1320 * Get the scsi driver to send a full inquiry to the
1321 * device and use the results to fill out the global
1322 * parameter structure.
1323 *
1324 * called from:
1325 * attach
1326 * open
1327 * ioctl (to reset original blksize)
1328 */
1329 int
1330 st_mode_sense(st, flags)
1331 struct st_softc *st;
1332 int flags;
1333 {
1334 union scsi_mode_sense_buf *data;
1335 struct scsi_link *sc_link = st->sc_link;
1336 u_int64_t block_count;
1337 u_int32_t density, block_size;
1338 u_char *page0 = NULL;
1339 u_int8_t dev_spec;
1340 int error, big;
1341
1342 data = malloc(sizeof(*data), M_TEMP, M_NOWAIT);
1343 if (data == NULL)
1344 return (ENOMEM);
1345
1346 /*
1347 * Ask for page 0 (vendor specific) mode sense data.
1348 */
1349 error = scsi_do_mode_sense(sc_link, 0, data, (void **)&page0,
1350 &density, &block_count, &block_size, 1, flags | SCSI_SILENT, &big);
1351 if (error != 0) {
1352 free(data, M_TEMP);
1353 return (error);
1354 }
1355
1356 /* It is valid for no page0 to be available. */
1357
1358 if (big)
1359 dev_spec = data->hdr_big.dev_spec;
1360 else
1361 dev_spec = data->hdr.dev_spec;
1362
1363 if (dev_spec & SMH_DSP_WRITE_PROT)
1364 st->flags |= ST_READONLY;
1365 else
1366 st->flags &= ~ST_READONLY;
1367
1368 st->numblks = block_count;
1369 st->media_blksize = block_size;
1370 st->media_density = density;
1371
1372 SC_DEBUG(sc_link, SDEV_DB3,
1373 ("density code 0x%x, %d-byte blocks, write-%s, ",
1374 st->media_density, st->media_blksize,
1375 st->flags & ST_READONLY ? "protected" : "enabled"));
1376 SC_DEBUGN(sc_link, SDEV_DB3,
1377 ("%sbuffered\n", dev_spec & SMH_DSP_BUFF_MODE ? "" : "un"));
1378
1379 sc_link->flags |= SDEV_MEDIA_LOADED;
1380
1381 free(data, M_TEMP);
1382 return (0);
1383 }
1384
1385 /*
1386 * Send a filled out parameter structure to the drive to
1387 * set it into the desire modes etc.
1388 */
1389 int
1390 st_mode_select(st, flags)
1391 struct st_softc *st;
1392 int flags;
1393 {
1394 union scsi_mode_sense_buf *inbuf, *outbuf;
1395 struct scsi_blk_desc general;
1396 struct scsi_link *sc_link = st->sc_link;
1397 u_int8_t *page0 = NULL;
1398 int error, big, page0_size;
1399
1400 inbuf = malloc(sizeof(*inbuf), M_TEMP, M_NOWAIT);
1401 if (inbuf == NULL)
1402 return (ENOMEM);
1403 outbuf = malloc(sizeof(*outbuf), M_TEMP, M_NOWAIT);
1404 if (outbuf == NULL) {
1405 free(inbuf, M_TEMP);
1406 return (ENOMEM);
1407 }
1408
1409 /*
1410 * This quirk deals with drives that have only one valid mode and think
1411 * this gives them license to reject all mode selects, even if the
1412 * selected mode is the one that is supported.
1413 */
1414 if (st->quirks & ST_Q_UNIMODAL) {
1415 SC_DEBUG(sc_link, SDEV_DB3,
1416 ("not setting density 0x%x blksize 0x%x\n",
1417 st->density, st->blksize));
1418 free(inbuf, M_TEMP);
1419 free(outbuf, M_TEMP);
1420 return (0);
1421 }
1422
1423 if (sc_link->flags & SDEV_ATAPI) {
1424 free(inbuf, M_TEMP);
1425 free(outbuf, M_TEMP);
1426 return (0);
1427 }
1428
1429 bzero(outbuf, sizeof(*outbuf));
1430 bzero(&general, sizeof(general));
1431
1432 general.density = st->density;
1433 if (st->flags & ST_FIXEDBLOCKS)
1434 _lto3b(st->blksize, general.blklen);
1435
1436 /*
1437 * Ask for page 0 (vendor specific) mode sense data.
1438 */
1439 error = scsi_do_mode_sense(sc_link, 0, inbuf, (void **)&page0, NULL,
1440 NULL, NULL, 1, flags | SCSI_SILENT, &big);
1441 if (error != 0) {
1442 free(inbuf, M_TEMP);
1443 free(outbuf, M_TEMP);
1444 return (error);
1445 }
1446
1447 if (page0 == NULL) {
1448 page0_size = 0;
1449 } else if (big == 0) {
1450 page0_size = inbuf->hdr.data_length +
1451 sizeof(inbuf->hdr.data_length) - sizeof(inbuf->hdr) -
1452 inbuf->hdr.blk_desc_len;
1453 memcpy(&outbuf->buf[sizeof(outbuf->hdr)+ sizeof(general)],
1454 page0, page0_size);
1455 } else {
1456 page0_size = _2btol(inbuf->hdr_big.data_length) +
1457 sizeof(inbuf->hdr_big.data_length) -
1458 sizeof(inbuf->hdr_big) -
1459 _2btol(inbuf->hdr_big.blk_desc_len);
1460 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big) + sizeof(general)],
1461 page0, page0_size);
1462 }
1463
1464 /*
1465 * Set up for a mode select.
1466 */
1467 if (big == 0) {
1468 outbuf->hdr.data_length = sizeof(outbuf->hdr) +
1469 sizeof(general) + page0_size -
1470 sizeof(outbuf->hdr.data_length);
1471 if ((st->flags & ST_DONTBUFFER) == 0)
1472 outbuf->hdr.dev_spec = SMH_DSP_BUFF_MODE_ON;
1473 outbuf->hdr.blk_desc_len = sizeof(general);
1474 memcpy(&outbuf->buf[sizeof(outbuf->hdr)],
1475 &general, sizeof(general));
1476 error = scsi_mode_select(st->sc_link, 0, &outbuf->hdr,
1477 flags, ST_CTL_TIME);
1478 free(inbuf, M_TEMP);
1479 free(outbuf, M_TEMP);
1480 return (error);
1481 }
1482
1483 /* MODE SENSE (10) header was returned, so use MODE SELECT (10). */
1484 _lto2b((sizeof(outbuf->hdr_big) + sizeof(general) + page0_size -
1485 sizeof(outbuf->hdr_big.data_length)), outbuf->hdr_big.data_length);
1486 if ((st->flags & ST_DONTBUFFER) == 0)
1487 outbuf->hdr_big.dev_spec = SMH_DSP_BUFF_MODE_ON;
1488 _lto2b(sizeof(general), outbuf->hdr_big.blk_desc_len);
1489 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big)], &general,
1490 sizeof(general));
1491
1492 error = scsi_mode_select_big(st->sc_link, 0, &outbuf->hdr_big,
1493 flags, ST_CTL_TIME);
1494 free(inbuf, M_TEMP);
1495 free(outbuf, M_TEMP);
1496 return (error);
1497 }
1498
1499 /*
1500 * issue an erase command
1501 */
1502 int
1503 st_erase(st, full, flags)
1504 struct st_softc *st;
1505 int full, flags;
1506 {
1507 struct scsi_erase cmd;
1508 int tmo;
1509
1510 /*
1511 * Full erase means set LONG bit in erase command, which asks
1512 * the drive to erase the entire unit. Without this bit, we're
1513 * asking the drive to write an erase gap.
1514 */
1515 bzero(&cmd, sizeof(cmd));
1516 cmd.opcode = ERASE;
1517 if (full) {
1518 cmd.byte2 = SE_IMMED|SE_LONG;
1519 tmo = ST_SPC_TIME;
1520 } else {
1521 cmd.byte2 = SE_IMMED;
1522 tmo = ST_IO_TIME;
1523 }
1524
1525 /*
1526 * XXX We always do this asynchronously, for now. How long should
1527 * we wait if we want to (eventually) to it synchronously?
1528 */
1529 return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *)&cmd,
1530 sizeof(cmd), 0, 0, ST_RETRIES, tmo, NULL, flags));
1531 }
1532
1533 /*
1534 * skip N blocks/filemarks/seq filemarks/eom
1535 */
1536 int
1537 st_space(st, number, what, flags)
1538 struct st_softc *st;
1539 u_int what;
1540 int flags;
1541 int number;
1542 {
1543 struct scsi_space cmd;
1544 int error;
1545
1546 switch (what) {
1547 case SP_BLKS:
1548 if (st->flags & ST_PER_ACTION) {
1549 if (number > 0) {
1550 st->flags &= ~ST_PER_ACTION;
1551 return EIO;
1552 } else if (number < 0) {
1553 if (st->flags & ST_AT_FILEMARK) {
1554 /*
1555 * Handling of ST_AT_FILEMARK
1556 * in st_space will fill in the
1557 * right file mark count.
1558 */
1559 error = st_space(st, 0, SP_FILEMARKS,
1560 flags);
1561 if (error)
1562 return error;
1563 }
1564 if (st->flags & ST_BLANK_READ) {
1565 st->flags &= ~ST_BLANK_READ;
1566 return EIO;
1567 }
1568 st->flags &= ~ST_EIO_PENDING;
1569 }
1570 }
1571 break;
1572 case SP_FILEMARKS:
1573 if (st->flags & ST_EIO_PENDING) {
1574 if (number > 0) {
1575 /* pretend we just discovered the error */
1576 st->flags &= ~ST_EIO_PENDING;
1577 return EIO;
1578 } else if (number < 0) {
1579 /* back away from the error */
1580 st->flags &= ~ST_EIO_PENDING;
1581 }
1582 }
1583 if (st->flags & ST_AT_FILEMARK) {
1584 st->flags &= ~ST_AT_FILEMARK;
1585 number--;
1586 }
1587 if ((st->flags & ST_BLANK_READ) && (number < 0)) {
1588 /* back away from unwritten tape */
1589 st->flags &= ~ST_BLANK_READ;
1590 number++; /* XXX dubious */
1591 }
1592 break;
1593 case SP_EOM:
1594 if (st->flags & ST_EIO_PENDING) {
1595 /* pretend we just discovered the error */
1596 st->flags &= ~ST_EIO_PENDING;
1597 return EIO;
1598 }
1599 if (st->flags & ST_AT_FILEMARK)
1600 st->flags &= ~ST_AT_FILEMARK;
1601 break;
1602 }
1603 if (number == 0)
1604 return 0;
1605
1606 bzero(&cmd, sizeof(cmd));
1607 cmd.opcode = SPACE;
1608 cmd.byte2 = what;
1609 _lto3b(number, cmd.number);
1610
1611 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd,
1612 sizeof(cmd), 0, 0, 0, ST_SPC_TIME, NULL, flags);
1613
1614 if (error != 0) {
1615 st->media_fileno = -1;
1616 st->media_blkno = -1;
1617 } else {
1618 switch (what) {
1619 case SP_BLKS:
1620 if (st->media_blkno != -1) {
1621 st->media_blkno += number;
1622 if (st->media_blkno < 0)
1623 st->media_blkno = -1;
1624 }
1625 break;
1626 case SP_FILEMARKS:
1627 if (st->media_fileno != -1) {
1628 st->media_fileno += number;
1629 st->media_blkno = 0;
1630 }
1631 break;
1632 default:
1633 st->media_fileno = -1;
1634 st->media_blkno = -1;
1635 break;
1636 }
1637 }
1638
1639 return (error);
1640 }
1641
1642 /*
1643 * write N filemarks
1644 */
1645 int
1646 st_write_filemarks(st, number, flags)
1647 struct st_softc *st;
1648 int flags;
1649 int number;
1650 {
1651 struct scsi_write_filemarks cmd;
1652 int error;
1653
1654 /*
1655 * It's hard to write a negative number of file marks.
1656 * Don't try.
1657 */
1658 if (number < 0)
1659 return EINVAL;
1660 switch (number) {
1661 case 0: /* really a command to sync the drive's buffers */
1662 break;
1663 case 1:
1664 if (st->flags & ST_FM_WRITTEN) /* already have one down */
1665 st->flags &= ~ST_WRITTEN;
1666 else
1667 st->flags |= ST_FM_WRITTEN;
1668 st->flags &= ~ST_PER_ACTION;
1669 break;
1670 default:
1671 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN);
1672 }
1673
1674 bzero(&cmd, sizeof(cmd));
1675 cmd.opcode = WRITE_FILEMARKS;
1676 _lto3b(number, cmd.number);
1677
1678 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd,
1679 sizeof(cmd), 0, 0, 0, ST_IO_TIME * 4, NULL, flags);
1680
1681 if (error != 0) {
1682 st->media_fileno = -1;
1683 st->media_blkno = -1;
1684 } else if (st->media_fileno != -1) {
1685 st->media_fileno += number;
1686 st->media_blkno = 0;
1687 }
1688
1689 return (error);
1690 }
1691
1692 /*
1693 * Make sure the right number of file marks is on tape if the
1694 * tape has been written. If the position argument is true,
1695 * leave the tape positioned where it was originally.
1696 *
1697 * nmarks returns the number of marks to skip (or, if position
1698 * true, which were skipped) to get back original position.
1699 */
1700 int
1701 st_check_eod(st, position, nmarks, flags)
1702 struct st_softc *st;
1703 int position;
1704 int *nmarks;
1705 int flags;
1706 {
1707 int error;
1708
1709 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) {
1710 default:
1711 *nmarks = 0;
1712 return 0;
1713 case ST_WRITTEN:
1714 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD:
1715 *nmarks = 1;
1716 break;
1717 case ST_WRITTEN | ST_2FM_AT_EOD:
1718 *nmarks = 2;
1719 }
1720 error = st_write_filemarks(st, *nmarks, flags);
1721 if (position && !error)
1722 error = st_space(st, -*nmarks, SP_FILEMARKS, flags);
1723 return error;
1724 }
1725
1726 /*
1727 * load/unload/retension
1728 */
1729 int
1730 st_load(st, type, flags)
1731 struct st_softc *st;
1732 u_int type;
1733 int flags;
1734 {
1735 struct scsi_load cmd;
1736
1737 st->media_fileno = -1;
1738 st->media_blkno = -1;
1739
1740 if (type != LD_LOAD) {
1741 int error;
1742 int nmarks;
1743
1744 error = st_check_eod(st, FALSE, &nmarks, flags);
1745 if (error)
1746 return error;
1747 }
1748 if (st->quirks & ST_Q_IGNORE_LOADS) {
1749 if (type == LD_LOAD) {
1750 /*
1751 * If we ignore loads, at least we should try a rewind.
1752 */
1753 return st_rewind(st, 0, flags);
1754 }
1755 return (0);
1756 }
1757
1758
1759 bzero(&cmd, sizeof(cmd));
1760 cmd.opcode = LOAD;
1761 cmd.how = type;
1762
1763 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd,
1764 sizeof(cmd), 0, 0, ST_RETRIES, ST_SPC_TIME, NULL, flags);
1765 }
1766
1767 /*
1768 * Rewind the device
1769 */
1770 int
1771 st_rewind(st, immediate, flags)
1772 struct st_softc *st;
1773 u_int immediate;
1774 int flags;
1775 {
1776 struct scsi_rewind cmd;
1777 int error;
1778 int nmarks;
1779
1780 error = st_check_eod(st, FALSE, &nmarks, flags);
1781 if (error)
1782 return error;
1783 st->flags &= ~ST_PER_ACTION;
1784
1785 bzero(&cmd, sizeof(cmd));
1786 cmd.opcode = REWIND;
1787 cmd.byte2 = immediate;
1788
1789 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd,
1790 sizeof(cmd), 0, 0, ST_RETRIES,
1791 immediate ? ST_CTL_TIME: ST_SPC_TIME, NULL, flags);
1792
1793 if (error == 0) {
1794 st->media_fileno = 0;
1795 st->media_blkno = 0;
1796 }
1797
1798 return (error);
1799 }
1800
1801 /*
1802 * Look at the returned sense and act on the error and detirmine
1803 * The unix error number to pass back... (0 = report no error)
1804 * (-1 = continue processing)
1805 */
1806 int
1807 st_interpret_sense(xs)
1808 struct scsi_xfer *xs;
1809 {
1810 struct scsi_sense_data *sense = &xs->sense;
1811 struct scsi_link *sc_link = xs->sc_link;
1812 struct st_softc *st = sc_link->device_softc;
1813 struct buf *bp = xs->bp;
1814 u_int8_t serr = sense->error_code & SSD_ERRCODE;
1815 u_int8_t skey = sense->flags & SSD_KEY;
1816 int32_t info;
1817
1818 if (((sc_link->flags & SDEV_OPEN) == 0) ||
1819 (serr != SSD_ERRCODE_CURRENT && serr != SSD_ERRCODE_DEFERRED))
1820 return (EJUSTRETURN); /* let the generic code handle it */
1821
1822 switch (skey) {
1823
1824 /*
1825 * We do custom processing in st for the unit becoming ready case.
1826 * in this case we do not allow xs->retries to be decremented
1827 * only on the "Unit Becoming Ready" case. This is because tape
1828 * drives report "Unit Becoming Ready" when loading media, etc.
1829 * and can take a long time. Rather than having a massive timeout
1830 * for all operations (which would cause other problems) we allow
1831 * operations to wait (but be interruptable with Ctrl-C) forever
1832 * as long as the drive is reporting that it is becoming ready.
1833 * all other cases are handled as per the default.
1834 */
1835
1836 case SKEY_NOT_READY:
1837 if ((xs->flags & SCSI_IGNORE_NOT_READY) != 0)
1838 return (0);
1839 switch (ASC_ASCQ(sense)) {
1840 case SENSE_NOT_READY_BECOMING_READY:
1841 SC_DEBUG(sc_link, SDEV_DB1, ("not ready: busy (%#x)\n",
1842 sense->add_sense_code_qual));
1843 /* don't count this as a retry */
1844 xs->retries++;
1845 return (scsi_delay(xs, 1));
1846 default:
1847 return (EJUSTRETURN);
1848 }
1849 case SKEY_NO_SENSE:
1850 case SKEY_RECOVERED_ERROR:
1851 case SKEY_MEDIUM_ERROR:
1852 case SKEY_VOLUME_OVERFLOW:
1853 case SKEY_BLANK_CHECK:
1854 break;
1855 default:
1856 return (EJUSTRETURN);
1857 }
1858
1859 /*
1860 * Get the sense fields and work out what code
1861 */
1862 if (sense->error_code & SSD_ERRCODE_VALID)
1863 info = _4btol(sense->info);
1864 else
1865 info = xs->datalen; /* bad choice if fixed blocks */
1866 if (st->flags & ST_FIXEDBLOCKS) {
1867 xs->resid = info * st->blksize;
1868 if (sense->flags & SSD_EOM) {
1869 st->flags |= ST_EIO_PENDING;
1870 if (bp)
1871 bp->b_resid = xs->resid;
1872 }
1873 if (sense->flags & SSD_FILEMARK) {
1874 st->flags |= ST_AT_FILEMARK;
1875 if (st->media_fileno != -1) {
1876 st->media_fileno++;
1877 st->media_blkno = 0;
1878 }
1879 if (bp)
1880 bp->b_resid = xs->resid;
1881 }
1882 if (sense->flags & SSD_ILI) {
1883 st->flags |= ST_EIO_PENDING;
1884 if (bp)
1885 bp->b_resid = xs->resid;
1886 if (sense->error_code & SSD_ERRCODE_VALID &&
1887 (xs->flags & SCSI_SILENT) == 0)
1888 printf("%s: block wrong size, %d blocks residual\n",
1889 st->sc_dev.dv_xname, info);
1890
1891 /*
1892 * This quirk code helps the drive read
1893 * the first tape block, regardless of
1894 * format. That is required for these
1895 * drives to return proper MODE SENSE
1896 * information.
1897 */
1898 if ((st->quirks & ST_Q_SENSE_HELP) &&
1899 !(sc_link->flags & SDEV_MEDIA_LOADED))
1900 st->blksize -= 512;
1901 }
1902 /*
1903 * If no data was transferred, return immediately
1904 */
1905 if (xs->resid >= xs->datalen) {
1906 if (st->flags & ST_EIO_PENDING)
1907 return EIO;
1908 if (st->flags & ST_AT_FILEMARK) {
1909 if (bp)
1910 bp->b_resid = xs->resid;
1911 return 0;
1912 }
1913 }
1914 } else { /* must be variable mode */
1915 xs->resid = xs->datalen; /* to be sure */
1916 if (sense->flags & SSD_EOM)
1917 return EIO;
1918 if (sense->flags & SSD_FILEMARK) {
1919 if (st->media_fileno != -1) {
1920 st->media_fileno++;
1921 st->media_blkno = 0;
1922 }
1923 if (bp)
1924 bp->b_resid = bp->b_bcount;
1925 return 0;
1926 }
1927 if (sense->flags & SSD_ILI) {
1928 if (info < 0) {
1929 /*
1930 * the record was bigger than the read
1931 */
1932 if ((xs->flags & SCSI_SILENT) == 0)
1933 printf("%s: %d-byte record too big\n",
1934 st->sc_dev.dv_xname,
1935 xs->datalen - info);
1936 return (EIO);
1937 } else if (info > xs->datalen) {
1938 /*
1939 * huh? the residual is bigger than the request
1940 */
1941 if ((xs->flags & SCSI_SILENT) == 0) {
1942 printf(
1943 "%s: bad residual %d out of %d\n",
1944 st->sc_dev.dv_xname, info,
1945 xs->datalen);
1946 return (EIO);
1947 }
1948 }
1949 xs->resid = info;
1950 if (bp)
1951 bp->b_resid = info;
1952 return (0);
1953 }
1954 }
1955
1956 if (skey == SKEY_BLANK_CHECK) {
1957 /*
1958 * This quirk code helps the drive read the first tape block,
1959 * regardless of format. That is required for these drives to
1960 * return proper MODE SENSE information.
1961 */
1962 if ((st->quirks & ST_Q_SENSE_HELP) &&
1963 !(sc_link->flags & SDEV_MEDIA_LOADED)) {
1964 /* still starting */
1965 st->blksize -= 512;
1966 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) {
1967 st->flags |= ST_BLANK_READ;
1968 xs->resid = xs->datalen;
1969 if (bp) {
1970 bp->b_resid = xs->resid;
1971 /* return an EOF */
1972 }
1973 return (0);
1974 }
1975 }
1976
1977 return (EJUSTRETURN);
1978 }
1979
1980 /*
1981 * The quirk here is that the drive returns some value to st_mode_sense
1982 * incorrectly until the tape has actually passed by the head.
1983 *
1984 * The method is to set the drive to large fixed-block state (user-specified
1985 * density and 1024-byte blocks), then read and rewind to get it to sense the
1986 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't
1987 * work, as a last resort, try variable- length blocks. The result will be
1988 * the ability to do an accurate st_mode_sense.
1989 *
1990 * We know we can do a rewind because we just did a load, which implies rewind.
1991 * Rewind seems preferable to space backward if we have a virgin tape.
1992 *
1993 * The rest of the code for this quirk is in ILI processing and BLANK CHECK
1994 * error processing, both part of st_interpret_sense.
1995 */
1996 int
1997 st_touch_tape(st)
1998 struct st_softc *st;
1999 {
2000 char *buf;
2001 int readsize;
2002 int error;
2003
2004 buf = malloc(1024, M_TEMP, M_NOWAIT);
2005 if (!buf)
2006 return ENOMEM;
2007
2008 if ((error = st_mode_sense(st, 0)) != 0)
2009 goto bad;
2010 st->blksize = 1024;
2011 do {
2012 switch (st->blksize) {
2013 case 512:
2014 case 1024:
2015 readsize = st->blksize;
2016 st->flags |= ST_FIXEDBLOCKS;
2017 break;
2018 default:
2019 readsize = 1;
2020 st->flags &= ~ST_FIXEDBLOCKS;
2021 }
2022 if ((error = st_mode_select(st, 0)) != 0)
2023 goto bad;
2024 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */
2025 if ((error = st_rewind(st, 0, 0)) != 0) {
2026 bad: free(buf, M_TEMP);
2027 return error;
2028 }
2029 } while (readsize != 1 && readsize > st->blksize);
2030
2031 free(buf, M_TEMP);
2032 return 0;
2033 }
2034
2035 int
2036 stdump(dev, blkno, va, size)
2037 dev_t dev;
2038 daddr64_t blkno;
2039 caddr_t va;
2040 size_t size;
2041 {
2042
2043 /* Not implemented. */
2044 return ENXIO;
2045 }