st.c revision 1.92
1/* $OpenBSD: st.c,v 1.92 2010/01/15 05:31:38 krw 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#include <sys/vnode.h> 73 74#include <scsi/scsi_all.h> 75#include <scsi/scsi_tape.h> 76#include <scsi/scsiconf.h> 77 78/* Defines for device specific stuff */ 79#define DEF_FIXED_BSIZE 512 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 */ 97struct modes { 98 u_int quirks; /* same definitions as in quirkdata */ 99 int blksize; 100 u_int8_t density; 101}; 102 103struct 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 113struct st_quirk_inquiry_pattern { 114 struct scsi_inquiry_pattern pattern; 115 struct quirkdata quirkdata; 116}; 117 118const 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 188struct st_softc { 189 struct device sc_dev; 190 191 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 */ 197 198 struct scsi_link *sc_link; /* our link to the adpter etc. */ 199 200 int blkmin; /* min blk size */ 201 int blkmax; /* max blk size */ 202 const struct quirkdata *quirkdata; /* if we have a rogue entry */ 203 204 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. */ 209 210 u_int drive_quirks; /* quirks of this drive */ 211 212 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 218 219 struct buf buf_queue; /* the queue of pending IO operations */ 220 struct timeout sc_timeout; 221 struct mutex sc_buf_mtx; 222 struct mutex sc_start_mtx; 223 u_int sc_start_count; 224}; 225 226 227int stmatch(struct device *, void *, void *); 228void stattach(struct device *, struct device *, void *); 229int stactivate(struct device *, int); 230int stdetach(struct device *, int); 231 232void stminphys(struct buf *); 233void st_kill_buffers(struct st_softc *); 234void st_identify_drive(struct st_softc *, struct scsi_inquiry_data *); 235void st_loadquirks(struct st_softc *); 236int st_mount_tape(dev_t, int); 237void st_unmount(struct st_softc *, int, int); 238int st_decide_mode(struct st_softc *, int); 239void ststart(void *); 240struct buf *st_buf_dequeue(struct st_softc *); 241void st_buf_enqueue(struct st_softc *, struct buf *); 242void st_buf_requeue(struct st_softc *, struct buf *); 243void st_buf_done(struct scsi_xfer *); 244int st_read(struct st_softc *, char *, int, int); 245int st_read_block_limits(struct st_softc *, int); 246int st_mode_sense(struct st_softc *, int); 247int st_mode_select(struct st_softc *, int); 248int st_space(struct st_softc *, int, u_int, int); 249int st_write_filemarks(struct st_softc *, int, int); 250int st_check_eod(struct st_softc *, int, int *, int); 251int st_load(struct st_softc *, u_int, int); 252int st_rewind(struct st_softc *, u_int, int); 253int st_interpret_sense(struct scsi_xfer *); 254int st_touch_tape(struct st_softc *); 255int st_erase(struct st_softc *, int, int); 256 257struct cfattach st_ca = { 258 sizeof(struct st_softc), stmatch, stattach, 259 stdetach, stactivate 260}; 261 262struct cfdriver st_cd = { 263 NULL, "st", DV_TAPE 264}; 265 266struct scsi_device st_switch = { 267 st_interpret_sense, 268 ststart, 269 NULL, 270 NULL, 271}; 272 273#define ST_INFO_VALID 0x0001 274#define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 275#define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 276#define ST_FIXEDBLOCKS 0x0008 277#define ST_AT_FILEMARK 0x0010 278#define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 279#define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 280#define ST_FM_WRITTEN 0x0100 /* 281 * EOF file mark written -- used with 282 * ~ST_WRITTEN to indicate that multiple file 283 * marks have been written 284 */ 285#define ST_DYING 0x40 /* dying, when deactivated */ 286#define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 287#define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 288#define ST_MOUNTED 0x0800 /* Device is presently mounted */ 289#define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 290#define ST_WAITING 0x2000 291 292#define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 293#define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 294 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 295 ST_2FM_AT_EOD | ST_PER_ACTION) 296 297#define stlookup(unit) (struct st_softc *)device_lookup(&st_cd, (unit)) 298 299const struct scsi_inquiry_pattern st_patterns[] = { 300 {T_SEQUENTIAL, T_REMOV, 301 "", "", ""}, 302}; 303 304int 305stmatch(struct device *parent, void *match, void *aux) 306{ 307 struct scsi_attach_args *sa = aux; 308 int priority; 309 310 (void)scsi_inqmatch(sa->sa_inqbuf, 311 st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 312 sizeof(st_patterns[0]), &priority); 313 return (priority); 314} 315 316/* 317 * The routine called by the low level scsi routine when it discovers 318 * A device suitable for this driver 319 */ 320void 321stattach(struct device *parent, struct device *self, void *aux) 322{ 323 struct st_softc *st = (void *)self; 324 struct scsi_attach_args *sa = aux; 325 struct scsi_link *sc_link = sa->sa_sc_link; 326 327 SC_DEBUG(sc_link, SDEV_DB2, ("stattach:\n")); 328 329 /* 330 * Store information needed to contact our base driver 331 */ 332 st->sc_link = sc_link; 333 sc_link->device = &st_switch; 334 sc_link->device_softc = st; 335 336 /* 337 * Check if the drive is a known criminal and take 338 * Any steps needed to bring it into line 339 */ 340 st_identify_drive(st, sa->sa_inqbuf); 341 printf("\n"); 342 343 mtx_init(&st->sc_buf_mtx, IPL_BIO); 344 mtx_init(&st->sc_start_mtx, IPL_BIO); 345 346 timeout_set(&st->sc_timeout, ststart, st); 347 348 /* 349 * Set up the buf queue for this device 350 */ 351 st->buf_queue.b_active = 0; 352 st->buf_queue.b_actf = 0; 353 st->buf_queue.b_actb = &st->buf_queue.b_actf; 354 355 /* Start up with media position unknown. */ 356 st->media_fileno = -1; 357 st->media_blkno = -1; 358 359 /* 360 * Reset the media loaded flag, sometimes the data 361 * acquired at boot time is not quite accurate. This 362 * will be checked again at the first open. 363 */ 364 sc_link->flags &= ~SDEV_MEDIA_LOADED; 365} 366 367int 368stactivate(struct device *self, int act) 369{ 370 struct st_softc *st = (struct st_softc *)self; 371 int rv = 0; 372 373 switch (act) { 374 case DVACT_ACTIVATE: 375 break; 376 377 case DVACT_DEACTIVATE: 378 st->flags |= ST_DYING; 379 st_kill_buffers(st); 380 break; 381 } 382 383 return (rv); 384} 385 386int 387stdetach(struct device *self, int flags) 388{ 389 struct st_softc *st = (struct st_softc *)self; 390 int bmaj, cmaj, mn; 391 392 st_kill_buffers(st); 393 394 /* Locate the lowest minor number to be detached. */ 395 mn = STUNIT(self->dv_unit); 396 397 for (bmaj = 0; bmaj < nblkdev; bmaj++) 398 if (bdevsw[bmaj].d_open == stopen) { 399 vdevgone(bmaj, mn, mn + 0, VBLK); 400 vdevgone(bmaj, mn, mn + 1, VBLK); 401 vdevgone(bmaj, mn, mn + 2, VBLK); 402 vdevgone(bmaj, mn, mn + 3, VBLK); 403 } 404 for (cmaj = 0; cmaj < nchrdev; cmaj++) 405 if (cdevsw[cmaj].d_open == stopen) { 406 vdevgone(cmaj, mn, mn + 0, VCHR); 407 vdevgone(cmaj, mn, mn + 1, VCHR); 408 vdevgone(cmaj, mn, mn + 2, VCHR); 409 vdevgone(cmaj, mn, mn + 3, VCHR); 410 } 411 412 return (0); 413} 414 415/* 416 * Use the inquiry routine in 'scsi_base' to get drive info so we can 417 * Further tailor our behaviour. 418 */ 419void 420st_identify_drive(struct st_softc *st, struct scsi_inquiry_data *inqbuf) 421{ 422 const struct st_quirk_inquiry_pattern *finger; 423 int priority; 424 425 finger = (const struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf, 426 st_quirk_patterns, 427 sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]), 428 sizeof(st_quirk_patterns[0]), &priority); 429 if (priority != 0) { 430 st->quirkdata = &finger->quirkdata; 431 st->drive_quirks = finger->quirkdata.quirks; 432 st->quirks = finger->quirkdata.quirks; /* start value */ 433 st_loadquirks(st); 434 } 435} 436 437/* 438 * initialise the subdevices to the default (QUIRK) state. 439 * this will remove any setting made by the system operator or previous 440 * operations. 441 */ 442void 443st_loadquirks(struct st_softc *st) 444{ 445 const struct modes *mode; 446 struct modes *mode2; 447 448 mode = &st->quirkdata->modes; 449 mode2 = &st->modes; 450 bzero(mode2, sizeof(struct modes)); 451 st->modeflags &= ~(BLKSIZE_SET_BY_QUIRK | 452 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 453 DENSITY_SET_BY_USER); 454 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 455 mode2->blksize = mode->blksize; 456 st->modeflags |= BLKSIZE_SET_BY_QUIRK; 457 } 458 if (mode->density) { 459 mode2->density = mode->density; 460 st->modeflags |= DENSITY_SET_BY_QUIRK; 461 } 462} 463 464/* 465 * open the device. 466 */ 467int 468stopen(dev_t dev, int flags, int fmt, struct proc *p) 469{ 470 struct scsi_link *sc_link; 471 struct st_softc *st; 472 int error = 0; 473 474 st = stlookup(STUNIT(dev)); 475 if (st == NULL) 476 return (ENXIO); 477 if (st->flags & ST_DYING) { 478 error = ENXIO; 479 goto done; 480 } 481 sc_link = st->sc_link; 482 483 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 484 STUNIT(dev), st_cd.cd_ndevs)); 485 486 /* 487 * Tape is an exclusive media. Only one open at a time. 488 */ 489 if (sc_link->flags & SDEV_OPEN) { 490 SC_DEBUG(sc_link, SDEV_DB4, ("already open\n")); 491 error = EBUSY; 492 goto done; 493 } 494 495 /* Use st_interpret_sense() now. */ 496 sc_link->flags |= SDEV_OPEN; 497 498 /* 499 * Check the unit status. This clears any outstanding errors and 500 * will ensure that media is present. 501 */ 502 error = scsi_test_unit_ready(sc_link, TEST_READY_RETRIES, 503 SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE | 504 SCSI_IGNORE_ILLEGAL_REQUEST); 505 506 /* 507 * Terminate any exising mount session if there is no media. 508 */ 509 if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0) 510 st_unmount(st, NOEJECT, DOREWIND); 511 512 if (error) { 513 sc_link->flags &= ~SDEV_OPEN; 514 goto done; 515 } 516 517 if ((st->flags & ST_MOUNTED) == 0) { 518 error = st_mount_tape(dev, flags); 519 if (error) { 520 sc_link->flags &= ~SDEV_OPEN; 521 goto done; 522 } 523 } 524 525 /* 526 * Make sure that a tape opened in write-only mode will have 527 * file marks written on it when closed, even if not written to. 528 * This is for SUN compatibility 529 */ 530 if ((flags & O_ACCMODE) == FWRITE) 531 st->flags |= ST_WRITTEN; 532 533done: 534 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 535 device_unref(&st->sc_dev); 536 return (error); 537} 538 539/* 540 * close the device.. only called if we are the LAST 541 * occurrence of an open device 542 */ 543int 544stclose(dev_t dev, int flags, int mode, struct proc *p) 545{ 546 struct scsi_link *sc_link; 547 struct st_softc *st; 548 int error = 0; 549 550 st = stlookup(STUNIT(dev)); 551 if (st == NULL) 552 return (ENXIO); 553 if (st->flags & ST_DYING) { 554 error = ENXIO; 555 goto done; 556 } 557 sc_link = st->sc_link; 558 559 SC_DEBUG(sc_link, SDEV_DB1, ("closing\n")); 560 561 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 562 st_write_filemarks(st, 1, 0); 563 564 switch (STMODE(dev)) { 565 case 0: /* normal */ 566 st_unmount(st, NOEJECT, DOREWIND); 567 break; 568 case 3: /* eject, no rewind */ 569 st_unmount(st, EJECT, NOREWIND); 570 break; 571 case 1: /* no rewind */ 572 /* leave mounted unless media seems to have been removed */ 573 if (!(sc_link->flags & SDEV_MEDIA_LOADED)) 574 st_unmount(st, NOEJECT, NOREWIND); 575 break; 576 case 2: /* rewind, eject */ 577 st_unmount(st, EJECT, DOREWIND); 578 break; 579 } 580 sc_link->flags &= ~SDEV_OPEN; 581 timeout_del(&st->sc_timeout); 582 583done: 584 device_unref(&st->sc_dev); 585 return (error); 586} 587 588/* 589 * Start a new mount session. 590 * Copy in all the default parameters from the selected device mode. 591 * and try guess any that seem to be defaulted. 592 */ 593int 594st_mount_tape(dev_t dev, int flags) 595{ 596 struct st_softc *st; 597 struct scsi_link *sc_link; 598 int error = 0; 599 600 st = stlookup(STUNIT(dev)); 601 if (st == NULL) 602 return (ENXIO); 603 if (st->flags & ST_DYING) { 604 error = ENXIO; 605 goto done; 606 } 607 sc_link = st->sc_link; 608 609 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n")); 610 611 if (st->flags & ST_MOUNTED) 612 goto done; 613 614 st->quirks = st->drive_quirks | st->modes.quirks; 615 /* 616 * If the media is new, then make sure we give it a chance to 617 * to do a 'load' instruction. (We assume it is new.) 618 */ 619 if ((error = st_load(st, LD_LOAD, 0)) != 0) 620 goto done; 621 622 /* 623 * Throw another dummy instruction to catch 624 * 'Unit attention' errors. Some drives appear to give 625 * these after doing a Load instruction. 626 * (noteably some DAT drives) 627 */ 628 /* XXX */ 629 scsi_test_unit_ready(sc_link, TEST_READY_RETRIES, SCSI_SILENT); 630 631 /* 632 * Some devices can't tell you much until they have been 633 * asked to look at the media. This quirk does this. 634 */ 635 if (st->quirks & ST_Q_SENSE_HELP) 636 if ((error = st_touch_tape(st)) != 0) 637 return error; 638 /* 639 * Load the physical device parameters 640 * loads: blkmin, blkmax 641 */ 642 if (!(sc_link->flags & SDEV_ATAPI) && 643 (error = st_read_block_limits(st, 0)) != 0) 644 goto done; 645 646 /* 647 * Load the media dependent parameters 648 * includes: media_blksize,media_density,numblks 649 * As we have a tape in, it should be reflected here. 650 * If not you may need the "quirk" above. 651 */ 652 if ((error = st_mode_sense(st, 0)) != 0) 653 goto done; 654 655 /* 656 * If we have gained a permanent density from somewhere, 657 * then use it in preference to the one supplied by 658 * default by the driver. 659 */ 660 if (st->modeflags & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 661 st->density = st->modes.density; 662 else 663 st->density = st->media_density; 664 /* 665 * If we have gained a permanent blocksize 666 * then use it in preference to the one supplied by 667 * default by the driver. 668 */ 669 st->flags &= ~ST_FIXEDBLOCKS; 670 if (st->modeflags & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 671 st->blksize = st->modes.blksize; 672 if (st->blksize) 673 st->flags |= ST_FIXEDBLOCKS; 674 } else { 675 if ((error = st_decide_mode(st, FALSE)) != 0) 676 goto done; 677 } 678 if ((error = st_mode_select(st, 0)) != 0) { 679 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 680 goto done; 681 } 682 scsi_prevent(sc_link, PR_PREVENT, 683 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 684 st->flags |= ST_MOUNTED; 685 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 686 687done: 688 device_unref(&st->sc_dev); 689 return (error); 690} 691 692/* 693 * End the present mount session. 694 * Rewind, and optionally eject the tape. 695 * Reset various flags to indicate that all new 696 * operations require another mount operation 697 */ 698void 699st_unmount(struct st_softc *st, int eject, int rewind) 700{ 701 struct scsi_link *sc_link = st->sc_link; 702 int nmarks; 703 704 st->media_fileno = -1; 705 st->media_blkno = -1; 706 707 if (!(st->flags & ST_MOUNTED)) 708 return; 709 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 710 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 711 if (rewind) 712 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 713 scsi_prevent(sc_link, PR_ALLOW, 714 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 715 if (eject) 716 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 717 st->flags &= ~ST_MOUNTED; 718 sc_link->flags &= ~SDEV_MEDIA_LOADED; 719} 720 721/* 722 * Given all we know about the device, media, mode, 'quirks' and 723 * initial operation, make a decision as to how we should be set 724 * to run (regarding blocking and EOD marks) 725 */ 726int 727st_decide_mode(struct st_softc *st, int first_read) 728{ 729 struct scsi_link *sc_link = st->sc_link; 730 731 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 732 733 /* ATAPI tapes are always fixed blocksize. */ 734 if (sc_link->flags & SDEV_ATAPI) { 735 st->flags |= ST_FIXEDBLOCKS; 736 if (st->media_blksize > 0) 737 st->blksize = st->media_blksize; 738 else 739 st->blksize = DEF_FIXED_BSIZE; 740 goto done; 741 } 742 743 /* 744 * If the drive can only handle fixed-length blocks and only at 745 * one size, perhaps we should just do that. 746 */ 747 if (st->blkmin && (st->blkmin == st->blkmax)) { 748 st->flags |= ST_FIXEDBLOCKS; 749 st->blksize = st->blkmin; 750 SC_DEBUG(sc_link, SDEV_DB3, 751 ("blkmin == blkmax of %d\n", st->blkmin)); 752 goto done; 753 } 754 /* 755 * If the tape density mandates (or even suggests) use of fixed 756 * or variable-length blocks, comply. 757 */ 758 switch (st->density) { 759 case HALFINCH_800: 760 case HALFINCH_1600: 761 case HALFINCH_6250: 762 case DDS: 763 st->flags &= ~ST_FIXEDBLOCKS; 764 st->blksize = 0; 765 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 766 goto done; 767 case QIC_11: 768 case QIC_24: 769 case QIC_120: 770 case QIC_150: 771 case QIC_525: 772 case QIC_1320: 773 st->flags |= ST_FIXEDBLOCKS; 774 if (st->media_blksize > 0) 775 st->blksize = st->media_blksize; 776 else 777 st->blksize = DEF_FIXED_BSIZE; 778 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 779 goto done; 780 } 781 /* 782 * If we're about to read the tape, perhaps we should choose 783 * fixed or variable-length blocks and block size according to 784 * what the drive found on the tape. 785 */ 786 if (first_read && 787 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 788 (st->media_blksize == DEF_FIXED_BSIZE) || 789 (st->media_blksize == 1024))) { 790 if (st->media_blksize > 0) 791 st->flags |= ST_FIXEDBLOCKS; 792 else 793 st->flags &= ~ST_FIXEDBLOCKS; 794 st->blksize = st->media_blksize; 795 SC_DEBUG(sc_link, SDEV_DB3, 796 ("Used media_blksize of %d\n", st->media_blksize)); 797 goto done; 798 } 799 /* 800 * We're getting no hints from any direction. Choose variable- 801 * length blocks arbitrarily. 802 */ 803 st->flags &= ~ST_FIXEDBLOCKS; 804 st->blksize = 0; 805 SC_DEBUG(sc_link, SDEV_DB3, 806 ("Give up and default to variable mode\n")); 807 808done: 809 /* 810 * Decide whether or not to write two file marks to signify end- 811 * of-data. Make the decision as a function of density. If 812 * the decision is not to use a second file mark, the SCSI BLANK 813 * CHECK condition code will be recognized as end-of-data when 814 * first read. 815 * (I think this should be a by-product of fixed/variable..julian) 816 */ 817 switch (st->density) { 818/* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 819 case QIC_11: 820 case QIC_24: 821 case QIC_120: 822 case QIC_150: 823 case QIC_525: 824 case QIC_1320: 825 st->flags &= ~ST_2FM_AT_EOD; 826 break; 827 default: 828 st->flags |= ST_2FM_AT_EOD; 829 } 830 return 0; 831} 832 833/* 834 * Actually translate the requested transfer into 835 * one the physical driver can understand 836 * The transfer is described by a buf and will include 837 * only one physical transfer. 838 */ 839void 840ststrategy(struct buf *bp) 841{ 842 struct scsi_link *sc_link; 843 struct st_softc *st; 844 int error, s; 845 846 st = stlookup(STUNIT(bp->b_dev)); 847 if (st == NULL) 848 return; 849 if (st->flags & ST_DYING) { 850 error = ENXIO; 851 goto done; 852 } 853 sc_link = st->sc_link; 854 855 SC_DEBUG(sc_link, SDEV_DB2, ("ststrategy: %ld bytes @ blk %d\n", 856 bp->b_bcount, bp->b_blkno)); 857 858 if (st->flags & ST_DYING) { 859 bp->b_error = ENXIO; 860 goto bad; 861 } 862 /* 863 * If it's a null transfer, return immediately. 864 */ 865 if (bp->b_bcount == 0) 866 goto done; 867 /* 868 * Odd sized request on fixed drives are verboten 869 */ 870 if (st->flags & ST_FIXEDBLOCKS) { 871 if (bp->b_bcount % st->blksize) { 872 printf("%s: bad request, must be multiple of %d\n", 873 st->sc_dev.dv_xname, st->blksize); 874 bp->b_error = EIO; 875 goto bad; 876 } 877 } 878 /* 879 * as are out-of-range requests on variable drives. 880 */ 881 else if (bp->b_bcount < st->blkmin || 882 (st->blkmax && bp->b_bcount > st->blkmax)) { 883 printf("%s: bad request, must be between %d and %d\n", 884 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 885 bp->b_error = EIO; 886 goto bad; 887 } 888 889 /* 890 * Place it in the queue of activities for this tape 891 * at the end (a bit silly because we only have on user.. 892 * (but it could fork())) 893 */ 894 st_buf_enqueue(st, bp); 895 896 /* 897 * Tell the device to get going on the transfer if it's 898 * not doing anything, otherwise just wait for completion 899 * (All a bit silly if we're only allowing 1 open but..) 900 */ 901 ststart(st); 902 903 device_unref(&st->sc_dev); 904 return; 905bad: 906 bp->b_flags |= B_ERROR; 907done: 908 device_unref(&st->sc_dev); 909 /* 910 * Correctly set the buf to indicate a completed xfer 911 */ 912 bp->b_resid = bp->b_bcount; 913 s = splbio(); 914 biodone(bp); 915 splx(s); 916} 917 918void 919st_buf_enqueue(struct st_softc *st, struct buf *bp) 920{ 921 struct buf *dp; 922 923 mtx_enter(&st->sc_buf_mtx); 924 dp = &st->buf_queue; 925 bp->b_actf = NULL; 926 bp->b_actb = dp->b_actb; 927 *dp->b_actb = bp; 928 dp->b_actb = &bp->b_actf; 929 mtx_leave(&st->sc_buf_mtx); 930} 931 932struct buf * 933st_buf_dequeue(struct st_softc *st) 934{ 935 struct buf *bp; 936 937 mtx_enter(&st->sc_buf_mtx); 938 bp = st->buf_queue.b_actf; 939 if (bp != NULL) 940 st->buf_queue.b_actf = bp->b_actf; 941 if (st->buf_queue.b_actf == NULL) 942 st->buf_queue.b_actb = &st->buf_queue.b_actf; 943 mtx_leave(&st->sc_buf_mtx); 944 945 return (bp); 946} 947 948void 949st_buf_requeue(struct st_softc *st, struct buf *bp) 950{ 951 mtx_enter(&st->sc_buf_mtx); 952 bp->b_actf = st->buf_queue.b_actf; 953 st->buf_queue.b_actf = bp; 954 if (bp->b_actf == NULL) 955 st->buf_queue.b_actb = &bp->b_actf; 956 mtx_leave(&st->sc_buf_mtx); 957} 958 959 960/* 961 * ststart looks to see if there is a buf waiting for the device 962 * and that the device is not already busy. If both are true, 963 * It dequeues the buf and creates a scsi command to perform the 964 * transfer required. The transfer request will call scsi_done 965 * on completion, which will in turn call this routine again 966 * so that the next queued transfer is performed. 967 * The bufs are queued by the strategy routine (ststrategy) 968 * 969 * This routine is also called after other non-queued requests 970 * have been made of the scsi driver, to ensure that the queue 971 * continues to be drained. 972 * ststart() is called at splbio from ststrategy and scsi_done() 973 */ 974void 975ststart(void *v) 976{ 977 struct st_softc *st = v; 978 struct scsi_link *sc_link = st->sc_link; 979 struct buf *bp; 980 struct scsi_rw_tape *cmd; 981 struct scsi_xfer *xs; 982 int s; 983 984 SC_DEBUG(sc_link, SDEV_DB2, ("ststart\n")); 985 986 if (st->flags & ST_DYING) 987 return; 988 989 mtx_enter(&st->sc_start_mtx); 990 st->sc_start_count++; 991 if (st->sc_start_count > 1) { 992 mtx_leave(&st->sc_start_mtx); 993 return; 994 } 995 mtx_leave(&st->sc_start_mtx); 996 CLR(st->flags, ST_WAITING); 997restart: 998 while (!ISSET(st->flags, ST_WAITING) && 999 (bp = st_buf_dequeue(st)) != NULL) { 1000 1001 /* 1002 * if the device has been unmounted by the user 1003 * then throw away all requests until done 1004 */ 1005 if (!(st->flags & ST_MOUNTED) || 1006 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 1007 /* make sure that one implies the other.. */ 1008 sc_link->flags &= ~SDEV_MEDIA_LOADED; 1009 bp->b_flags |= B_ERROR; 1010 bp->b_resid = bp->b_bcount; 1011 bp->b_error = EIO; 1012 s = splbio(); 1013 biodone(bp); 1014 splx(s); 1015 continue; 1016 } 1017 1018 xs = scsi_xs_get(sc_link, SCSI_NOSLEEP); 1019 if (xs == NULL) { 1020 st_buf_requeue(st, bp); 1021 break; 1022 } 1023 1024 /* 1025 * only FIXEDBLOCK devices have pending operations 1026 */ 1027 if (st->flags & ST_FIXEDBLOCKS) { 1028 /* 1029 * If we are at a filemark but have not reported it yet 1030 * then we should report it now 1031 */ 1032 if (st->flags & ST_AT_FILEMARK) { 1033 if ((bp->b_flags & B_READ) == B_WRITE) { 1034 /* 1035 * Handling of ST_AT_FILEMARK in 1036 * st_space will fill in the right file 1037 * mark count. 1038 * Back up over filemark 1039 */ 1040 if (st_space(st, 0, SP_FILEMARKS, 0)) { 1041 bp->b_flags |= B_ERROR; 1042 bp->b_resid = bp->b_bcount; 1043 bp->b_error = EIO; 1044 s = splbio(); 1045 biodone(bp); 1046 splx(s); 1047 continue; 1048 } 1049 } else { 1050 bp->b_resid = bp->b_bcount; 1051 bp->b_error = 0; 1052 bp->b_flags &= ~B_ERROR; 1053 st->flags &= ~ST_AT_FILEMARK; 1054 s = splbio(); 1055 biodone(bp); 1056 splx(s); 1057 continue; /* seek more work */ 1058 } 1059 } 1060 /* 1061 * If we are at EIO (e.g. EOM) but have not reported it 1062 * yet then we should report it now 1063 */ 1064 if (st->flags & ST_EIO_PENDING) { 1065 bp->b_resid = bp->b_bcount; 1066 bp->b_error = EIO; 1067 bp->b_flags |= B_ERROR; 1068 st->flags &= ~ST_EIO_PENDING; 1069 s = splbio(); 1070 biodone(bp); 1071 splx(s); 1072 continue; /* seek more work */ 1073 } 1074 } 1075 1076 /* 1077 * Fill out the scsi command 1078 */ 1079 cmd = (struct scsi_rw_tape *)xs->cmd; 1080 bzero(cmd, sizeof(*cmd)); 1081 if ((bp->b_flags & B_READ) == B_WRITE) { 1082 cmd->opcode = WRITE; 1083 st->flags &= ~ST_FM_WRITTEN; 1084 st->flags |= ST_WRITTEN; 1085 xs->flags |= SCSI_DATA_OUT; 1086 } else { 1087 cmd->opcode = READ; 1088 xs->flags |= SCSI_DATA_IN; 1089 } 1090 1091 /* 1092 * Handle "fixed-block-mode" tape drives by using the 1093 * block count instead of the length. 1094 */ 1095 if (st->flags & ST_FIXEDBLOCKS) { 1096 cmd->byte2 |= SRW_FIXED; 1097 _lto3b(bp->b_bcount / st->blksize, cmd->len); 1098 } else 1099 _lto3b(bp->b_bcount, cmd->len); 1100 1101 if (st->media_blkno != -1) { 1102 /* Update block count now, errors will set it to -1. */ 1103 if (st->flags & ST_FIXEDBLOCKS) 1104 st->media_blkno += _3btol(cmd->len); 1105 else if (cmd->len != 0) 1106 st->media_blkno++; 1107 } 1108 1109 xs->cmdlen = sizeof(*cmd); 1110 xs->timeout = ST_IO_TIME; 1111 xs->data = bp->b_data; 1112 xs->datalen = bp->b_bcount; 1113 xs->done = st_buf_done; 1114 xs->cookie = bp; 1115 1116 /* 1117 * go ask the adapter to do all this for us 1118 */ 1119 scsi_xs_exec(xs); 1120 } /* go back and see if we can cram more work in.. */ 1121 1122 mtx_enter(&st->sc_start_mtx); 1123 st->sc_start_count--; 1124 if (st->sc_start_count != 0) { 1125 st->sc_start_count = 1; 1126 mtx_leave(&st->sc_start_mtx); 1127 goto restart; 1128 } 1129 mtx_leave(&st->sc_start_mtx); 1130} 1131 1132void 1133st_buf_done(struct scsi_xfer *xs) 1134{ 1135 struct st_softc *st = xs->sc_link->device_softc; 1136 struct buf *bp = xs->cookie; 1137 1138 splassert(IPL_BIO); 1139 1140 switch (xs->error) { 1141 case XS_NOERROR: 1142 bp->b_error = 0; 1143 bp->b_resid = xs->resid; 1144 break; 1145 1146 case XS_NO_CCB: 1147 /* The adapter is busy, requeue the buf and try it later. */ 1148 st_buf_requeue(st, bp); 1149 scsi_xs_put(xs); 1150 SET(st->flags, ST_WAITING); /* break out of cdstart loop */ 1151 timeout_add(&st->sc_timeout, 1); 1152 return; 1153 1154 case XS_SENSE: 1155 case XS_SHORTSENSE: 1156 if (scsi_interpret_sense(xs) != ERESTART) 1157 xs->retries = 0; 1158 goto retry; 1159 1160 case XS_BUSY: 1161 if (xs->retries) { 1162 if (scsi_delay(xs, 1) != ERESTART) 1163 xs->retries = 0; 1164 } 1165 goto retry; 1166 1167 case XS_TIMEOUT: 1168retry: 1169 if (xs->retries--) { 1170 scsi_xs_exec(xs); 1171 return; 1172 } 1173 /* FALLTHROUGH */ 1174 1175 default: 1176 bp->b_error = EIO; 1177 bp->b_flags |= B_ERROR; 1178 bp->b_resid = bp->b_bcount; 1179 break; 1180 } 1181 1182 biodone(bp); 1183 scsi_xs_put(xs); 1184 ststart(st); /* restart io */ 1185} 1186 1187void 1188stminphys(struct buf *bp) 1189{ 1190 struct st_softc *st; 1191 1192 st = stlookup(STUNIT(bp->b_dev)); 1193 if (st == NULL) 1194 return; /* can't happen */ 1195 1196 (*st->sc_link->adapter->scsi_minphys)(bp, st->sc_link); 1197 1198 device_unref(&st->sc_dev); 1199} 1200 1201int 1202stread(dev_t dev, struct uio *uio, int iomode) 1203{ 1204 struct st_softc *st; 1205 1206 st = stlookup(STUNIT(dev)); 1207 if (st == NULL) 1208 return (ENXIO); 1209 1210 if (st->flags & ST_DYING) { 1211 device_unref(&st->sc_dev); 1212 return (ENXIO); 1213 } 1214 1215 return (physio(ststrategy, NULL, dev, B_READ, stminphys, uio)); 1216} 1217 1218int 1219stwrite(dev_t dev, struct uio *uio, int iomode) 1220{ 1221 struct st_softc *st; 1222 1223 st = stlookup(STUNIT(dev)); 1224 if (st == NULL) 1225 return (ENXIO); 1226 1227 if (st->flags & ST_DYING) { 1228 device_unref(&st->sc_dev); 1229 return (ENXIO); 1230 } 1231 1232 return (physio(ststrategy, NULL, dev, B_WRITE, stminphys, uio)); 1233} 1234 1235/* 1236 * Perform special action on behalf of the user; 1237 * knows about the internals of this device 1238 */ 1239int 1240stioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct proc *p) 1241{ 1242 int error = 0; 1243 int nmarks; 1244 int flags = 0; 1245 struct st_softc *st; 1246 int hold_blksize; 1247 u_int8_t hold_density; 1248 struct mtop *mt = (struct mtop *) arg; 1249 int number; 1250 1251 /* 1252 * Find the device that the user is talking about 1253 */ 1254 st = stlookup(STUNIT(dev)); 1255 if (st == NULL) 1256 return (ENXIO); 1257 1258 if (st->flags & ST_DYING) { 1259 error = ENXIO; 1260 goto done; 1261 } 1262 1263 hold_blksize = st->blksize; 1264 hold_density = st->density; 1265 1266 switch (cmd) { 1267 1268 case MTIOCGET: { 1269 struct mtget *g = (struct mtget *) arg; 1270 1271 /* 1272 * (to get the current state of READONLY) 1273 */ 1274 error = st_mode_sense(st, SCSI_SILENT); 1275 if (error) 1276 break; 1277 1278 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1279 bzero(g, sizeof(struct mtget)); 1280 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1281 g->mt_blksiz = st->blksize; 1282 g->mt_density = st->density; 1283 g->mt_mblksiz = st->modes.blksize; 1284 g->mt_mdensity = st->modes.density; 1285 if (st->flags & ST_READONLY) 1286 g->mt_dsreg |= MT_DS_RDONLY; 1287 if (st->flags & ST_MOUNTED) 1288 g->mt_dsreg |= MT_DS_MOUNTED; 1289 g->mt_resid = st->mt_resid; 1290 g->mt_erreg = st->mt_erreg; 1291 g->mt_fileno = st->media_fileno; 1292 g->mt_blkno = st->media_blkno; 1293 /* 1294 * clear latched errors. 1295 */ 1296 st->mt_resid = 0; 1297 st->mt_erreg = 0; 1298 break; 1299 } 1300 case MTIOCTOP: { 1301 1302 SC_DEBUG(st->sc_link, SDEV_DB1, 1303 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); 1304 1305 number = mt->mt_count; 1306 switch (mt->mt_op) { 1307 case MTWEOF: /* write an end-of-file record */ 1308 error = st_write_filemarks(st, number, flags); 1309 break; 1310 case MTBSF: /* backward space file */ 1311 number = -number; 1312 case MTFSF: /* forward space file */ 1313 error = st_check_eod(st, FALSE, &nmarks, flags); 1314 if (!error) 1315 error = st_space(st, number - nmarks, 1316 SP_FILEMARKS, flags); 1317 break; 1318 case MTBSR: /* backward space record */ 1319 number = -number; 1320 case MTFSR: /* forward space record */ 1321 error = st_check_eod(st, TRUE, &nmarks, flags); 1322 if (!error) 1323 error = st_space(st, number, SP_BLKS, flags); 1324 break; 1325 case MTREW: /* rewind */ 1326 error = st_rewind(st, 0, flags); 1327 break; 1328 case MTOFFL: /* rewind and put the drive offline */ 1329 st_unmount(st, EJECT, DOREWIND); 1330 break; 1331 case MTNOP: /* no operation, sets status only */ 1332 break; 1333 case MTRETEN: /* retension the tape */ 1334 error = st_load(st, LD_RETENSION, flags); 1335 if (!error) 1336 error = st_load(st, LD_LOAD, flags); 1337 break; 1338 case MTEOM: /* forward space to end of media */ 1339 error = st_check_eod(st, FALSE, &nmarks, flags); 1340 if (!error) 1341 error = st_space(st, 1, SP_EOM, flags); 1342 break; 1343 case MTCACHE: /* enable controller cache */ 1344 st->flags &= ~ST_DONTBUFFER; 1345 goto try_new_value; 1346 case MTNOCACHE: /* disable controller cache */ 1347 st->flags |= ST_DONTBUFFER; 1348 goto try_new_value; 1349 case MTERASE: /* erase volume */ 1350 error = st_erase(st, number, flags); 1351 break; 1352 case MTSETBSIZ: /* Set block size for device */ 1353 if (number == 0) { 1354 st->flags &= ~ST_FIXEDBLOCKS; 1355 } else { 1356 if ((st->blkmin || st->blkmax) && 1357 (number < st->blkmin || 1358 number > st->blkmax)) { 1359 error = EINVAL; 1360 break; 1361 } 1362 st->flags |= ST_FIXEDBLOCKS; 1363 } 1364 st->blksize = number; 1365 st->flags |= ST_BLOCK_SET; /*XXX */ 1366 goto try_new_value; 1367 1368 case MTSETDNSTY: /* Set density for device and mode */ 1369 if (number < 0 || number > SCSI_MAX_DENSITY_CODE) { 1370 error = EINVAL; 1371 break; 1372 } else 1373 st->density = number; 1374 goto try_new_value; 1375 1376 default: 1377 error = EINVAL; 1378 } 1379 break; 1380 } 1381 case MTIOCIEOT: 1382 case MTIOCEEOT: 1383 break; 1384 1385#if 0 1386 case MTIOCRDSPOS: 1387 error = st_rdpos(st, 0, (u_int32_t *) arg); 1388 break; 1389 1390 case MTIOCRDHPOS: 1391 error = st_rdpos(st, 1, (u_int32_t *) arg); 1392 break; 1393 1394 case MTIOCSLOCATE: 1395 error = st_setpos(st, 0, (u_int32_t *) arg); 1396 break; 1397 1398 case MTIOCHLOCATE: 1399 error = st_setpos(st, 1, (u_int32_t *) arg); 1400 break; 1401#endif 1402 1403 default: 1404 error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p); 1405 break; 1406 } 1407 goto done; 1408 1409try_new_value: 1410 /* 1411 * Check that the mode being asked for is aggreeable to the 1412 * drive. If not, put it back the way it was. 1413 */ 1414 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */ 1415 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1416 st->density = hold_density; 1417 st->blksize = hold_blksize; 1418 if (st->blksize) 1419 st->flags |= ST_FIXEDBLOCKS; 1420 else 1421 st->flags &= ~ST_FIXEDBLOCKS; 1422 goto done; 1423 } 1424 /* 1425 * As the drive liked it, if we are setting a new default, 1426 * set it into the structures as such. 1427 */ 1428 switch (mt->mt_op) { 1429 case MTSETBSIZ: 1430 st->modes.blksize = st->blksize; 1431 st->modeflags |= BLKSIZE_SET_BY_USER; 1432 break; 1433 case MTSETDNSTY: 1434 st->modes.density = st->density; 1435 st->modeflags |= DENSITY_SET_BY_USER; 1436 break; 1437 } 1438 1439done: 1440 device_unref(&st->sc_dev); 1441 return (error); 1442} 1443 1444/* 1445 * Do a synchronous read. 1446 */ 1447int 1448st_read(struct st_softc *st, char *buf, int size, int flags) 1449{ 1450 struct scsi_rw_tape cmd; 1451 1452 /* 1453 * If it's a null transfer, return immediately 1454 */ 1455 if (size == 0) 1456 return 0; 1457 bzero(&cmd, sizeof(cmd)); 1458 cmd.opcode = READ; 1459 if (st->flags & ST_FIXEDBLOCKS) { 1460 cmd.byte2 |= SRW_FIXED; 1461 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1462 cmd.len); 1463 } else 1464 _lto3b(size, cmd.len); 1465 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1466 sizeof(cmd), (u_char *) buf, size, 0, ST_IO_TIME, NULL, 1467 flags | SCSI_DATA_IN); 1468} 1469 1470/* 1471 * Ask the drive what its min and max blk sizes are. 1472 */ 1473int 1474st_read_block_limits(struct st_softc *st, int flags) 1475{ 1476 struct scsi_block_limits cmd; 1477 struct scsi_block_limits_data block_limits; 1478 struct scsi_link *sc_link = st->sc_link; 1479 int error; 1480 1481 /* 1482 * First check if we have it all loaded 1483 */ 1484 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1485 return 0; 1486 1487 /* 1488 * do a 'Read Block Limits' 1489 */ 1490 bzero(&cmd, sizeof(cmd)); 1491 cmd.opcode = READ_BLOCK_LIMITS; 1492 1493 /* 1494 * do the command, update the global values 1495 */ 1496 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1497 sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), 1498 SCSI_RETRIES, ST_CTL_TIME, NULL, flags | SCSI_DATA_IN); 1499 if (error) 1500 return error; 1501 1502 st->blkmin = _2btol(block_limits.min_length); 1503 st->blkmax = _3btol(block_limits.max_length); 1504 1505 SC_DEBUG(sc_link, SDEV_DB3, 1506 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1507 return 0; 1508} 1509 1510/* 1511 * Get the scsi driver to send a full inquiry to the 1512 * device and use the results to fill out the global 1513 * parameter structure. 1514 * 1515 * called from: 1516 * attach 1517 * open 1518 * ioctl (to reset original blksize) 1519 */ 1520int 1521st_mode_sense(struct st_softc *st, int flags) 1522{ 1523 union scsi_mode_sense_buf *data; 1524 struct scsi_link *sc_link = st->sc_link; 1525 u_int64_t block_count; 1526 u_int32_t density, block_size; 1527 u_char *page0 = NULL; 1528 u_int8_t dev_spec; 1529 int error, big; 1530 1531 data = malloc(sizeof(*data), M_TEMP, M_NOWAIT); 1532 if (data == NULL) 1533 return (ENOMEM); 1534 1535 /* 1536 * Ask for page 0 (vendor specific) mode sense data. 1537 */ 1538 error = scsi_do_mode_sense(sc_link, 0, data, (void **)&page0, 1539 &density, &block_count, &block_size, 1, flags | SCSI_SILENT, &big); 1540 if (error != 0) { 1541 free(data, M_TEMP); 1542 return (error); 1543 } 1544 1545 /* It is valid for no page0 to be available. */ 1546 1547 if (big) 1548 dev_spec = data->hdr_big.dev_spec; 1549 else 1550 dev_spec = data->hdr.dev_spec; 1551 1552 if (dev_spec & SMH_DSP_WRITE_PROT) 1553 st->flags |= ST_READONLY; 1554 else 1555 st->flags &= ~ST_READONLY; 1556 1557 st->numblks = block_count; 1558 st->media_blksize = block_size; 1559 st->media_density = density; 1560 1561 SC_DEBUG(sc_link, SDEV_DB3, 1562 ("density code 0x%x, %d-byte blocks, write-%s, ", 1563 st->media_density, st->media_blksize, 1564 st->flags & ST_READONLY ? "protected" : "enabled")); 1565 SC_DEBUGN(sc_link, SDEV_DB3, 1566 ("%sbuffered\n", dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1567 1568 sc_link->flags |= SDEV_MEDIA_LOADED; 1569 1570 free(data, M_TEMP); 1571 return (0); 1572} 1573 1574/* 1575 * Send a filled out parameter structure to the drive to 1576 * set it into the desire modes etc. 1577 */ 1578int 1579st_mode_select(struct st_softc *st, int flags) 1580{ 1581 union scsi_mode_sense_buf *inbuf, *outbuf; 1582 struct scsi_blk_desc general; 1583 struct scsi_link *sc_link = st->sc_link; 1584 u_int8_t *page0 = NULL; 1585 int error, big, page0_size; 1586 1587 inbuf = malloc(sizeof(*inbuf), M_TEMP, M_NOWAIT); 1588 if (inbuf == NULL) 1589 return (ENOMEM); 1590 outbuf = malloc(sizeof(*outbuf), M_TEMP, M_NOWAIT | M_ZERO); 1591 if (outbuf == NULL) { 1592 free(inbuf, M_TEMP); 1593 return (ENOMEM); 1594 } 1595 1596 /* 1597 * This quirk deals with drives that have only one valid mode and think 1598 * this gives them license to reject all mode selects, even if the 1599 * selected mode is the one that is supported. 1600 */ 1601 if (st->quirks & ST_Q_UNIMODAL) { 1602 SC_DEBUG(sc_link, SDEV_DB3, 1603 ("not setting density 0x%x blksize 0x%x\n", 1604 st->density, st->blksize)); 1605 free(inbuf, M_TEMP); 1606 free(outbuf, M_TEMP); 1607 return (0); 1608 } 1609 1610 if (sc_link->flags & SDEV_ATAPI) { 1611 free(inbuf, M_TEMP); 1612 free(outbuf, M_TEMP); 1613 return (0); 1614 } 1615 1616 bzero(&general, sizeof(general)); 1617 1618 general.density = st->density; 1619 if (st->flags & ST_FIXEDBLOCKS) 1620 _lto3b(st->blksize, general.blklen); 1621 1622 /* 1623 * Ask for page 0 (vendor specific) mode sense data. 1624 */ 1625 error = scsi_do_mode_sense(sc_link, 0, inbuf, (void **)&page0, NULL, 1626 NULL, NULL, 1, flags | SCSI_SILENT, &big); 1627 if (error != 0) { 1628 free(inbuf, M_TEMP); 1629 free(outbuf, M_TEMP); 1630 return (error); 1631 } 1632 1633 if (page0 == NULL) { 1634 page0_size = 0; 1635 } else if (big == 0) { 1636 page0_size = inbuf->hdr.data_length + 1637 sizeof(inbuf->hdr.data_length) - sizeof(inbuf->hdr) - 1638 inbuf->hdr.blk_desc_len; 1639 memcpy(&outbuf->buf[sizeof(outbuf->hdr)+ sizeof(general)], 1640 page0, page0_size); 1641 } else { 1642 page0_size = _2btol(inbuf->hdr_big.data_length) + 1643 sizeof(inbuf->hdr_big.data_length) - 1644 sizeof(inbuf->hdr_big) - 1645 _2btol(inbuf->hdr_big.blk_desc_len); 1646 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big) + sizeof(general)], 1647 page0, page0_size); 1648 } 1649 1650 /* 1651 * Set up for a mode select. 1652 */ 1653 if (big == 0) { 1654 outbuf->hdr.data_length = sizeof(outbuf->hdr) + 1655 sizeof(general) + page0_size - 1656 sizeof(outbuf->hdr.data_length); 1657 if ((st->flags & ST_DONTBUFFER) == 0) 1658 outbuf->hdr.dev_spec = SMH_DSP_BUFF_MODE_ON; 1659 outbuf->hdr.blk_desc_len = sizeof(general); 1660 memcpy(&outbuf->buf[sizeof(outbuf->hdr)], 1661 &general, sizeof(general)); 1662 error = scsi_mode_select(st->sc_link, 0, &outbuf->hdr, 1663 flags, ST_CTL_TIME); 1664 free(inbuf, M_TEMP); 1665 free(outbuf, M_TEMP); 1666 return (error); 1667 } 1668 1669 /* MODE SENSE (10) header was returned, so use MODE SELECT (10). */ 1670 _lto2b((sizeof(outbuf->hdr_big) + sizeof(general) + page0_size - 1671 sizeof(outbuf->hdr_big.data_length)), outbuf->hdr_big.data_length); 1672 if ((st->flags & ST_DONTBUFFER) == 0) 1673 outbuf->hdr_big.dev_spec = SMH_DSP_BUFF_MODE_ON; 1674 _lto2b(sizeof(general), outbuf->hdr_big.blk_desc_len); 1675 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big)], &general, 1676 sizeof(general)); 1677 1678 error = scsi_mode_select_big(st->sc_link, 0, &outbuf->hdr_big, 1679 flags, ST_CTL_TIME); 1680 free(inbuf, M_TEMP); 1681 free(outbuf, M_TEMP); 1682 return (error); 1683} 1684 1685/* 1686 * issue an erase command 1687 */ 1688int 1689st_erase(struct st_softc *st, int full, int flags) 1690{ 1691 struct scsi_erase cmd; 1692 int tmo; 1693 1694 /* 1695 * Full erase means set LONG bit in erase command, which asks 1696 * the drive to erase the entire unit. Without this bit, we're 1697 * asking the drive to write an erase gap. 1698 */ 1699 bzero(&cmd, sizeof(cmd)); 1700 cmd.opcode = ERASE; 1701 if (full) { 1702 cmd.byte2 = SE_IMMED|SE_LONG; 1703 tmo = ST_SPC_TIME; 1704 } else { 1705 cmd.byte2 = SE_IMMED; 1706 tmo = ST_IO_TIME; 1707 } 1708 1709 /* 1710 * XXX We always do this asynchronously, for now. How long should 1711 * we wait if we want to (eventually) to it synchronously? 1712 */ 1713 return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *)&cmd, 1714 sizeof(cmd), 0, 0, SCSI_RETRIES, tmo, NULL, flags)); 1715} 1716 1717/* 1718 * skip N blocks/filemarks/seq filemarks/eom 1719 */ 1720int 1721st_space(struct st_softc *st, int number, u_int what, int flags) 1722{ 1723 struct scsi_space cmd; 1724 int error; 1725 1726 switch (what) { 1727 case SP_BLKS: 1728 if (st->flags & ST_PER_ACTION) { 1729 if (number > 0) { 1730 st->flags &= ~ST_PER_ACTION; 1731 return EIO; 1732 } else if (number < 0) { 1733 if (st->flags & ST_AT_FILEMARK) { 1734 /* 1735 * Handling of ST_AT_FILEMARK 1736 * in st_space will fill in the 1737 * right file mark count. 1738 */ 1739 error = st_space(st, 0, SP_FILEMARKS, 1740 flags); 1741 if (error) 1742 return error; 1743 } 1744 if (st->flags & ST_BLANK_READ) { 1745 st->flags &= ~ST_BLANK_READ; 1746 return EIO; 1747 } 1748 st->flags &= ~ST_EIO_PENDING; 1749 } 1750 } 1751 break; 1752 case SP_FILEMARKS: 1753 if (st->flags & ST_EIO_PENDING) { 1754 if (number > 0) { 1755 /* pretend we just discovered the error */ 1756 st->flags &= ~ST_EIO_PENDING; 1757 return EIO; 1758 } else if (number < 0) { 1759 /* back away from the error */ 1760 st->flags &= ~ST_EIO_PENDING; 1761 } 1762 } 1763 if (st->flags & ST_AT_FILEMARK) { 1764 st->flags &= ~ST_AT_FILEMARK; 1765 number--; 1766 } 1767 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1768 /* back away from unwritten tape */ 1769 st->flags &= ~ST_BLANK_READ; 1770 number++; /* XXX dubious */ 1771 } 1772 break; 1773 case SP_EOM: 1774 if (st->flags & ST_EIO_PENDING) { 1775 /* pretend we just discovered the error */ 1776 st->flags &= ~ST_EIO_PENDING; 1777 return EIO; 1778 } 1779 if (st->flags & ST_AT_FILEMARK) 1780 st->flags &= ~ST_AT_FILEMARK; 1781 break; 1782 } 1783 if (number == 0) 1784 return 0; 1785 1786 bzero(&cmd, sizeof(cmd)); 1787 cmd.opcode = SPACE; 1788 cmd.byte2 = what; 1789 _lto3b(number, cmd.number); 1790 1791 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1792 sizeof(cmd), 0, 0, 0, ST_SPC_TIME, NULL, flags); 1793 1794 if (error != 0) { 1795 st->media_fileno = -1; 1796 st->media_blkno = -1; 1797 } else { 1798 switch (what) { 1799 case SP_BLKS: 1800 if (st->media_blkno != -1) { 1801 st->media_blkno += number; 1802 if (st->media_blkno < 0) 1803 st->media_blkno = -1; 1804 } 1805 break; 1806 case SP_FILEMARKS: 1807 if (st->media_fileno != -1) { 1808 st->media_fileno += number; 1809 st->media_blkno = 0; 1810 } 1811 break; 1812 default: 1813 st->media_fileno = -1; 1814 st->media_blkno = -1; 1815 break; 1816 } 1817 } 1818 1819 return (error); 1820} 1821 1822/* 1823 * write N filemarks 1824 */ 1825int 1826st_write_filemarks(struct st_softc *st, int number, int flags) 1827{ 1828 struct scsi_write_filemarks cmd; 1829 int error; 1830 1831 /* 1832 * It's hard to write a negative number of file marks. 1833 * Don't try. 1834 */ 1835 if (number < 0) 1836 return EINVAL; 1837 switch (number) { 1838 case 0: /* really a command to sync the drive's buffers */ 1839 break; 1840 case 1: 1841 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1842 st->flags &= ~ST_WRITTEN; 1843 else 1844 st->flags |= ST_FM_WRITTEN; 1845 st->flags &= ~ST_PER_ACTION; 1846 break; 1847 default: 1848 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1849 } 1850 1851 bzero(&cmd, sizeof(cmd)); 1852 cmd.opcode = WRITE_FILEMARKS; 1853 _lto3b(number, cmd.number); 1854 1855 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1856 sizeof(cmd), 0, 0, 0, ST_IO_TIME * 4, NULL, flags); 1857 1858 if (error != 0) { 1859 st->media_fileno = -1; 1860 st->media_blkno = -1; 1861 } else if (st->media_fileno != -1) { 1862 st->media_fileno += number; 1863 st->media_blkno = 0; 1864 } 1865 1866 return (error); 1867} 1868 1869/* 1870 * Make sure the right number of file marks is on tape if the 1871 * tape has been written. If the position argument is true, 1872 * leave the tape positioned where it was originally. 1873 * 1874 * nmarks returns the number of marks to skip (or, if position 1875 * true, which were skipped) to get back original position. 1876 */ 1877int 1878st_check_eod(struct st_softc *st, int position, int *nmarks, int flags) 1879{ 1880 int error; 1881 1882 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1883 default: 1884 *nmarks = 0; 1885 return 0; 1886 case ST_WRITTEN: 1887 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1888 *nmarks = 1; 1889 break; 1890 case ST_WRITTEN | ST_2FM_AT_EOD: 1891 *nmarks = 2; 1892 } 1893 error = st_write_filemarks(st, *nmarks, flags); 1894 if (position && !error) 1895 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1896 return error; 1897} 1898 1899/* 1900 * load/unload/retension 1901 */ 1902int 1903st_load(struct st_softc *st, u_int type, int flags) 1904{ 1905 struct scsi_load cmd; 1906 1907 st->media_fileno = -1; 1908 st->media_blkno = -1; 1909 1910 if (type != LD_LOAD) { 1911 int error; 1912 int nmarks; 1913 1914 error = st_check_eod(st, FALSE, &nmarks, flags); 1915 if (error) 1916 return error; 1917 } 1918 if (st->quirks & ST_Q_IGNORE_LOADS) { 1919 if (type == LD_LOAD) { 1920 /* 1921 * If we ignore loads, at least we should try a rewind. 1922 */ 1923 return st_rewind(st, 0, flags); 1924 } 1925 return (0); 1926 } 1927 1928 1929 bzero(&cmd, sizeof(cmd)); 1930 cmd.opcode = LOAD; 1931 cmd.how = type; 1932 1933 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1934 sizeof(cmd), 0, 0, SCSI_RETRIES, ST_SPC_TIME, NULL, flags); 1935} 1936 1937/* 1938 * Rewind the device 1939 */ 1940int 1941st_rewind(struct st_softc *st, u_int immediate, int flags) 1942{ 1943 struct scsi_rewind cmd; 1944 int error; 1945 int nmarks; 1946 1947 error = st_check_eod(st, FALSE, &nmarks, flags); 1948 if (error) 1949 return error; 1950 st->flags &= ~ST_PER_ACTION; 1951 1952 bzero(&cmd, sizeof(cmd)); 1953 cmd.opcode = REWIND; 1954 cmd.byte2 = immediate; 1955 1956 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1957 sizeof(cmd), 0, 0, SCSI_RETRIES, 1958 immediate ? ST_CTL_TIME: ST_SPC_TIME, NULL, flags); 1959 1960 if (error == 0) { 1961 st->media_fileno = 0; 1962 st->media_blkno = 0; 1963 } 1964 1965 return (error); 1966} 1967 1968/* 1969 * Look at the returned sense and act on the error and detirmine 1970 * The unix error number to pass back... (0 = report no error) 1971 * (-1 = continue processing) 1972 */ 1973int 1974st_interpret_sense(struct scsi_xfer *xs) 1975{ 1976 struct scsi_sense_data *sense = &xs->sense; 1977 struct scsi_link *sc_link = xs->sc_link; 1978 struct st_softc *st = sc_link->device_softc; 1979 struct buf *bp = xs->bp; 1980 u_int8_t serr = sense->error_code & SSD_ERRCODE; 1981 u_int8_t skey = sense->flags & SSD_KEY; 1982 int32_t info; 1983 1984 if (((sc_link->flags & SDEV_OPEN) == 0) || 1985 (serr != SSD_ERRCODE_CURRENT && serr != SSD_ERRCODE_DEFERRED)) 1986 return (EJUSTRETURN); /* let the generic code handle it */ 1987 1988 switch (skey) { 1989 1990 /* 1991 * We do custom processing in st for the unit becoming ready case. 1992 * in this case we do not allow xs->retries to be decremented 1993 * only on the "Unit Becoming Ready" case. This is because tape 1994 * drives report "Unit Becoming Ready" when loading media, etc. 1995 * and can take a long time. Rather than having a massive timeout 1996 * for all operations (which would cause other problems) we allow 1997 * operations to wait (but be interruptable with Ctrl-C) forever 1998 * as long as the drive is reporting that it is becoming ready. 1999 * all other cases are handled as per the default. 2000 */ 2001 2002 case SKEY_NOT_READY: 2003 if ((xs->flags & SCSI_IGNORE_NOT_READY) != 0) 2004 return (0); 2005 switch (ASC_ASCQ(sense)) { 2006 case SENSE_NOT_READY_BECOMING_READY: 2007 SC_DEBUG(sc_link, SDEV_DB1, ("not ready: busy (%#x)\n", 2008 sense->add_sense_code_qual)); 2009 /* don't count this as a retry */ 2010 xs->retries++; 2011 return (scsi_delay(xs, 1)); 2012 default: 2013 return (EJUSTRETURN); 2014 } 2015 case SKEY_NO_SENSE: 2016 case SKEY_RECOVERED_ERROR: 2017 case SKEY_MEDIUM_ERROR: 2018 case SKEY_VOLUME_OVERFLOW: 2019 case SKEY_BLANK_CHECK: 2020 break; 2021 default: 2022 return (EJUSTRETURN); 2023 } 2024 2025 /* 2026 * Get the sense fields and work out what code 2027 */ 2028 if (sense->error_code & SSD_ERRCODE_VALID) 2029 info = _4btol(sense->info); 2030 else 2031 info = xs->datalen; /* bad choice if fixed blocks */ 2032 if (st->flags & ST_FIXEDBLOCKS) { 2033 xs->resid = info * st->blksize; 2034 if (sense->flags & SSD_EOM) { 2035 st->flags |= ST_EIO_PENDING; 2036 if (bp) 2037 bp->b_resid = xs->resid; 2038 } 2039 if (sense->flags & SSD_FILEMARK) { 2040 st->flags |= ST_AT_FILEMARK; 2041 if (st->media_fileno != -1) { 2042 st->media_fileno++; 2043 st->media_blkno = 0; 2044 } 2045 if (bp) 2046 bp->b_resid = xs->resid; 2047 } 2048 if (sense->flags & SSD_ILI) { 2049 st->flags |= ST_EIO_PENDING; 2050 if (bp) 2051 bp->b_resid = xs->resid; 2052 if (sense->error_code & SSD_ERRCODE_VALID && 2053 (xs->flags & SCSI_SILENT) == 0) 2054 printf("%s: block wrong size, %d blocks residual\n", 2055 st->sc_dev.dv_xname, info); 2056 2057 /* 2058 * This quirk code helps the drive read 2059 * the first tape block, regardless of 2060 * format. That is required for these 2061 * drives to return proper MODE SENSE 2062 * information. 2063 */ 2064 if ((st->quirks & ST_Q_SENSE_HELP) && 2065 !(sc_link->flags & SDEV_MEDIA_LOADED)) 2066 st->blksize -= 512; 2067 } 2068 /* 2069 * If no data was transferred, return immediately 2070 */ 2071 if (xs->resid >= xs->datalen) { 2072 if (st->flags & ST_EIO_PENDING) 2073 return EIO; 2074 if (st->flags & ST_AT_FILEMARK) { 2075 if (bp) 2076 bp->b_resid = xs->resid; 2077 return 0; 2078 } 2079 } 2080 } else { /* must be variable mode */ 2081 xs->resid = xs->datalen; /* to be sure */ 2082 if (sense->flags & SSD_EOM) 2083 return EIO; 2084 if (sense->flags & SSD_FILEMARK) { 2085 if (st->media_fileno != -1) { 2086 st->media_fileno++; 2087 st->media_blkno = 0; 2088 } 2089 if (bp) 2090 bp->b_resid = bp->b_bcount; 2091 return 0; 2092 } 2093 if (sense->flags & SSD_ILI) { 2094 if (info < 0) { 2095 /* 2096 * the record was bigger than the read 2097 */ 2098 if ((xs->flags & SCSI_SILENT) == 0) 2099 printf("%s: %d-byte record too big\n", 2100 st->sc_dev.dv_xname, 2101 xs->datalen - info); 2102 return (EIO); 2103 } else if (info > xs->datalen) { 2104 /* 2105 * huh? the residual is bigger than the request 2106 */ 2107 if ((xs->flags & SCSI_SILENT) == 0) 2108 printf( 2109 "%s: bad residual %d out of %d\n", 2110 st->sc_dev.dv_xname, info, 2111 xs->datalen); 2112 return (EIO); 2113 } 2114 xs->resid = info; 2115 if (bp) 2116 bp->b_resid = info; 2117 return (0); 2118 } 2119 } 2120 2121 if (skey == SKEY_BLANK_CHECK) { 2122 /* 2123 * This quirk code helps the drive read the first tape block, 2124 * regardless of format. That is required for these drives to 2125 * return proper MODE SENSE information. 2126 */ 2127 if ((st->quirks & ST_Q_SENSE_HELP) && 2128 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 2129 /* still starting */ 2130 st->blksize -= 512; 2131 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 2132 st->flags |= ST_BLANK_READ; 2133 xs->resid = xs->datalen; 2134 if (bp) { 2135 bp->b_resid = xs->resid; 2136 /* return an EOF */ 2137 } 2138 return (0); 2139 } 2140 } 2141 2142 return (EJUSTRETURN); 2143} 2144 2145/* 2146 * The quirk here is that the drive returns some value to st_mode_sense 2147 * incorrectly until the tape has actually passed by the head. 2148 * 2149 * The method is to set the drive to large fixed-block state (user-specified 2150 * density and 1024-byte blocks), then read and rewind to get it to sense the 2151 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 2152 * work, as a last resort, try variable- length blocks. The result will be 2153 * the ability to do an accurate st_mode_sense. 2154 * 2155 * We know we can do a rewind because we just did a load, which implies rewind. 2156 * Rewind seems preferable to space backward if we have a virgin tape. 2157 * 2158 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 2159 * error processing, both part of st_interpret_sense. 2160 */ 2161int 2162st_touch_tape(struct st_softc *st) 2163{ 2164 char *buf; 2165 int readsize; 2166 int error; 2167 2168 buf = malloc(1024, M_TEMP, M_NOWAIT); 2169 if (!buf) 2170 return ENOMEM; 2171 2172 if ((error = st_mode_sense(st, 0)) != 0) 2173 goto bad; 2174 st->blksize = 1024; 2175 do { 2176 switch (st->blksize) { 2177 case 512: 2178 case 1024: 2179 readsize = st->blksize; 2180 st->flags |= ST_FIXEDBLOCKS; 2181 break; 2182 default: 2183 readsize = 1; 2184 st->flags &= ~ST_FIXEDBLOCKS; 2185 } 2186 if ((error = st_mode_select(st, 0)) != 0) 2187 goto bad; 2188 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 2189 if ((error = st_rewind(st, 0, 0)) != 0) { 2190bad: free(buf, M_TEMP); 2191 return error; 2192 } 2193 } while (readsize != 1 && readsize > st->blksize); 2194 2195 free(buf, M_TEMP); 2196 return 0; 2197} 2198 2199int 2200stdump(dev_t dev, daddr64_t blkno, caddr_t va, size_t size) 2201{ 2202 2203 /* Not implemented. */ 2204 return ENXIO; 2205} 2206 2207/* 2208 * Remove unprocessed buffers from queue. 2209 */ 2210void 2211st_kill_buffers(struct st_softc *st) 2212{ 2213 struct buf *bp; 2214 int s; 2215 2216 while ((bp = st_buf_dequeue(st)) != NULL) { 2217 bp->b_error = ENXIO; 2218 bp->b_flags |= B_ERROR; 2219 s = splbio(); 2220 biodone(bp); 2221 splx(s); 2222 } 2223} 2224