1 /* $OpenBSD: st.c,v 1.86 2009/02/16 21:19:07 miod 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 */ 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; 190 191 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 }; 222 223 224 int stmatch(struct device *, void *, void *); 225 void stattach(struct device *, struct device *, void *); 226 int stactivate(struct device *, enum devact); 227 int stdetach(struct device *, int); 228 229 void stminphys(struct buf *); 230 void st_kill_buffers(struct st_softc *); 231 void st_identify_drive(struct st_softc *, struct scsi_inquiry_data *); 232 void st_loadquirks(struct st_softc *); 233 int st_mount_tape(dev_t, int); 234 void st_unmount(struct st_softc *, int, int); 235 int st_decide_mode(struct st_softc *, int); 236 void ststart(void *); 237 void strestart(void *); 238 int st_read(struct st_softc *, char *, int, int); 239 int st_read_block_limits(struct st_softc *, int); 240 int st_mode_sense(struct st_softc *, int); 241 int st_mode_select(struct st_softc *, int); 242 int st_space(struct st_softc *, int, u_int, int); 243 int st_write_filemarks(struct st_softc *, int, int); 244 int st_check_eod(struct st_softc *, int, int *, int); 245 int st_load(struct st_softc *, u_int, int); 246 int st_rewind(struct st_softc *, u_int, int); 247 int st_interpret_sense(struct scsi_xfer *); 248 int st_touch_tape(struct st_softc *); 249 int st_erase(struct st_softc *, int, int); 250 251 struct cfattach st_ca = { 252 sizeof(struct st_softc), stmatch, stattach, 253 stdetach, stactivate 254 }; 255 256 struct cfdriver st_cd = { 257 NULL, "st", DV_TAPE 258 }; 259 260 struct scsi_device st_switch = { 261 st_interpret_sense, 262 ststart, 263 NULL, 264 NULL, 265 }; 266 267 #define ST_INFO_VALID 0x0001 268 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 269 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 270 #define ST_FIXEDBLOCKS 0x0008 271 #define ST_AT_FILEMARK 0x0010 272 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 273 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 274 #define ST_FM_WRITTEN 0x0100 /* 275 * EOF file mark written -- used with 276 * ~ST_WRITTEN to indicate that multiple file 277 * marks have been written 278 */ 279 #define ST_DYING 0x40 /* dying, when deactivated */ 280 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 281 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 282 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 283 #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 284 285 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 286 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 287 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 288 ST_2FM_AT_EOD | ST_PER_ACTION) 289 290 #define stlookup(unit) (struct st_softc *)device_lookup(&st_cd, (unit)) 291 292 const struct scsi_inquiry_pattern st_patterns[] = { 293 {T_SEQUENTIAL, T_REMOV, 294 "", "", ""}, 295 }; 296 297 int 298 stmatch(struct device *parent, void *match, void *aux) 299 { 300 struct scsi_attach_args *sa = aux; 301 int priority; 302 303 (void)scsi_inqmatch(sa->sa_inqbuf, 304 st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 305 sizeof(st_patterns[0]), &priority); 306 return (priority); 307 } 308 309 /* 310 * The routine called by the low level scsi routine when it discovers 311 * A device suitable for this driver 312 */ 313 void 314 stattach(struct device *parent, struct device *self, void *aux) 315 { 316 struct st_softc *st = (void *)self; 317 struct scsi_attach_args *sa = aux; 318 struct scsi_link *sc_link = sa->sa_sc_link; 319 320 SC_DEBUG(sc_link, SDEV_DB2, ("stattach:\n")); 321 322 /* 323 * Store information needed to contact our base driver 324 */ 325 st->sc_link = sc_link; 326 sc_link->device = &st_switch; 327 sc_link->device_softc = st; 328 329 /* 330 * Check if the drive is a known criminal and take 331 * Any steps needed to bring it into line 332 */ 333 st_identify_drive(st, sa->sa_inqbuf); 334 printf("\n"); 335 336 timeout_set(&st->sc_timeout, strestart, st); 337 338 /* 339 * Set up the buf queue for this device 340 */ 341 st->buf_queue.b_active = 0; 342 st->buf_queue.b_actf = 0; 343 st->buf_queue.b_actb = &st->buf_queue.b_actf; 344 345 /* Start up with media position unknown. */ 346 st->media_fileno = -1; 347 st->media_blkno = -1; 348 349 /* 350 * Reset the media loaded flag, sometimes the data 351 * acquired at boot time is not quite accurate. This 352 * will be checked again at the first open. 353 */ 354 sc_link->flags &= ~SDEV_MEDIA_LOADED; 355 } 356 357 int 358 stactivate(struct device *self, enum devact act) 359 { 360 struct st_softc *st = (struct st_softc *)self; 361 int rv = 0; 362 363 switch (act) { 364 case DVACT_ACTIVATE: 365 break; 366 367 case DVACT_DEACTIVATE: 368 st->flags |= ST_DYING; 369 st_kill_buffers(st); 370 break; 371 } 372 373 return (rv); 374 } 375 376 int 377 stdetach(struct device *self, int flags) 378 { 379 struct st_softc *st = (struct st_softc *)self; 380 int bmaj, cmaj, mn; 381 382 st_kill_buffers(st); 383 384 /* Locate the lowest minor number to be detached. */ 385 mn = STUNIT(self->dv_unit); 386 387 for (bmaj = 0; bmaj < nblkdev; bmaj++) 388 if (bdevsw[bmaj].d_open == stopen) { 389 vdevgone(bmaj, mn, mn + 0, VBLK); 390 vdevgone(bmaj, mn, mn + 1, VBLK); 391 vdevgone(bmaj, mn, mn + 2, VBLK); 392 vdevgone(bmaj, mn, mn + 3, VBLK); 393 } 394 for (cmaj = 0; cmaj < nchrdev; cmaj++) 395 if (cdevsw[cmaj].d_open == stopen) { 396 vdevgone(cmaj, mn, mn + 0, VCHR); 397 vdevgone(cmaj, mn, mn + 1, VCHR); 398 vdevgone(cmaj, mn, mn + 2, VCHR); 399 vdevgone(cmaj, mn, mn + 3, VCHR); 400 } 401 402 return (0); 403 } 404 405 /* 406 * Use the inquiry routine in 'scsi_base' to get drive info so we can 407 * Further tailor our behaviour. 408 */ 409 void 410 st_identify_drive(struct st_softc *st, struct scsi_inquiry_data *inqbuf) 411 { 412 const struct st_quirk_inquiry_pattern *finger; 413 int priority; 414 415 finger = (const struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf, 416 st_quirk_patterns, 417 sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]), 418 sizeof(st_quirk_patterns[0]), &priority); 419 if (priority != 0) { 420 st->quirkdata = &finger->quirkdata; 421 st->drive_quirks = finger->quirkdata.quirks; 422 st->quirks = finger->quirkdata.quirks; /* start value */ 423 st_loadquirks(st); 424 } 425 } 426 427 /* 428 * initialise the subdevices to the default (QUIRK) state. 429 * this will remove any setting made by the system operator or previous 430 * operations. 431 */ 432 void 433 st_loadquirks(struct st_softc *st) 434 { 435 const struct modes *mode; 436 struct modes *mode2; 437 438 mode = &st->quirkdata->modes; 439 mode2 = &st->modes; 440 bzero(mode2, sizeof(struct modes)); 441 st->modeflags &= ~(BLKSIZE_SET_BY_QUIRK | 442 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 443 DENSITY_SET_BY_USER); 444 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 445 mode2->blksize = mode->blksize; 446 st->modeflags |= BLKSIZE_SET_BY_QUIRK; 447 } 448 if (mode->density) { 449 mode2->density = mode->density; 450 st->modeflags |= DENSITY_SET_BY_QUIRK; 451 } 452 } 453 454 /* 455 * open the device. 456 */ 457 int 458 stopen(dev_t dev, int flags, int fmt, struct proc *p) 459 { 460 struct scsi_link *sc_link; 461 struct st_softc *st; 462 int error = 0; 463 464 st = stlookup(STUNIT(dev)); 465 if (st == NULL) 466 return (ENXIO); 467 if (st->flags & ST_DYING) { 468 error = ENXIO; 469 goto done; 470 } 471 sc_link = st->sc_link; 472 473 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 474 STUNIT(dev), st_cd.cd_ndevs)); 475 476 /* 477 * Tape is an exclusive media. Only one open at a time. 478 */ 479 if (sc_link->flags & SDEV_OPEN) { 480 SC_DEBUG(sc_link, SDEV_DB4, ("already open\n")); 481 error = EBUSY; 482 goto done; 483 } 484 485 /* Use st_interpret_sense() now. */ 486 sc_link->flags |= SDEV_OPEN; 487 488 /* 489 * Check the unit status. This clears any outstanding errors and 490 * will ensure that media is present. 491 */ 492 error = scsi_test_unit_ready(sc_link, TEST_READY_RETRIES, 493 SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE | 494 SCSI_IGNORE_ILLEGAL_REQUEST); 495 496 /* 497 * Terminate any exising mount session if there is no media. 498 */ 499 if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0) 500 st_unmount(st, NOEJECT, DOREWIND); 501 502 if (error) { 503 sc_link->flags &= ~SDEV_OPEN; 504 goto done; 505 } 506 507 if ((st->flags & ST_MOUNTED) == 0) { 508 error = st_mount_tape(dev, flags); 509 if (error) { 510 sc_link->flags &= ~SDEV_OPEN; 511 goto done; 512 } 513 } 514 515 /* 516 * Make sure that a tape opened in write-only mode will have 517 * file marks written on it when closed, even if not written to. 518 * This is for SUN compatibility 519 */ 520 if ((flags & O_ACCMODE) == FWRITE) 521 st->flags |= ST_WRITTEN; 522 523 done: 524 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 525 device_unref(&st->sc_dev); 526 return (error); 527 } 528 529 /* 530 * close the device.. only called if we are the LAST 531 * occurrence of an open device 532 */ 533 int 534 stclose(dev_t dev, int flags, int mode, struct proc *p) 535 { 536 struct scsi_link *sc_link; 537 struct st_softc *st; 538 int error = 0; 539 540 st = stlookup(STUNIT(dev)); 541 if (st == NULL) 542 return (ENXIO); 543 if (st->flags & ST_DYING) { 544 error = ENXIO; 545 goto done; 546 } 547 sc_link = st->sc_link; 548 549 SC_DEBUG(sc_link, SDEV_DB1, ("closing\n")); 550 551 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 552 st_write_filemarks(st, 1, 0); 553 554 switch (STMODE(dev)) { 555 case 0: /* normal */ 556 st_unmount(st, NOEJECT, DOREWIND); 557 break; 558 case 3: /* eject, no rewind */ 559 st_unmount(st, EJECT, NOREWIND); 560 break; 561 case 1: /* no rewind */ 562 /* leave mounted unless media seems to have been removed */ 563 if (!(sc_link->flags & SDEV_MEDIA_LOADED)) 564 st_unmount(st, NOEJECT, NOREWIND); 565 break; 566 case 2: /* rewind, eject */ 567 st_unmount(st, EJECT, DOREWIND); 568 break; 569 } 570 sc_link->flags &= ~SDEV_OPEN; 571 timeout_del(&st->sc_timeout); 572 573 done: 574 device_unref(&st->sc_dev); 575 return (error); 576 } 577 578 /* 579 * Start a new mount session. 580 * Copy in all the default parameters from the selected device mode. 581 * and try guess any that seem to be defaulted. 582 */ 583 int 584 st_mount_tape(dev_t dev, int flags) 585 { 586 struct st_softc *st; 587 struct scsi_link *sc_link; 588 int error = 0; 589 590 st = stlookup(STUNIT(dev)); 591 if (st == NULL) 592 return (ENXIO); 593 if (st->flags & ST_DYING) { 594 error = ENXIO; 595 goto done; 596 } 597 sc_link = st->sc_link; 598 599 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n")); 600 601 if (st->flags & ST_MOUNTED) 602 goto done; 603 604 st->quirks = st->drive_quirks | st->modes.quirks; 605 /* 606 * If the media is new, then make sure we give it a chance to 607 * to do a 'load' instruction. (We assume it is new.) 608 */ 609 if ((error = st_load(st, LD_LOAD, 0)) != 0) 610 goto done; 611 612 /* 613 * Throw another dummy instruction to catch 614 * 'Unit attention' errors. Some drives appear to give 615 * these after doing a Load instruction. 616 * (noteably some DAT drives) 617 */ 618 /* XXX */ 619 scsi_test_unit_ready(sc_link, TEST_READY_RETRIES, SCSI_SILENT); 620 621 /* 622 * Some devices can't tell you much until they have been 623 * asked to look at the media. This quirk does this. 624 */ 625 if (st->quirks & ST_Q_SENSE_HELP) 626 if ((error = st_touch_tape(st)) != 0) 627 return error; 628 /* 629 * Load the physical device parameters 630 * loads: blkmin, blkmax 631 */ 632 if (!(sc_link->flags & SDEV_ATAPI) && 633 (error = st_read_block_limits(st, 0)) != 0) 634 goto done; 635 636 /* 637 * Load the media dependent parameters 638 * includes: media_blksize,media_density,numblks 639 * As we have a tape in, it should be reflected here. 640 * If not you may need the "quirk" above. 641 */ 642 if ((error = st_mode_sense(st, 0)) != 0) 643 goto done; 644 645 /* 646 * If we have gained a permanent density from somewhere, 647 * then use it in preference to the one supplied by 648 * default by the driver. 649 */ 650 if (st->modeflags & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 651 st->density = st->modes.density; 652 else 653 st->density = st->media_density; 654 /* 655 * If we have gained a permanent blocksize 656 * then use it in preference to the one supplied by 657 * default by the driver. 658 */ 659 st->flags &= ~ST_FIXEDBLOCKS; 660 if (st->modeflags & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 661 st->blksize = st->modes.blksize; 662 if (st->blksize) 663 st->flags |= ST_FIXEDBLOCKS; 664 } else { 665 if ((error = st_decide_mode(st, FALSE)) != 0) 666 goto done; 667 } 668 if ((error = st_mode_select(st, 0)) != 0) { 669 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 670 goto done; 671 } 672 scsi_prevent(sc_link, PR_PREVENT, 673 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 674 st->flags |= ST_MOUNTED; 675 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 676 677 done: 678 device_unref(&st->sc_dev); 679 return (error); 680 } 681 682 /* 683 * End the present mount session. 684 * Rewind, and optionally eject the tape. 685 * Reset various flags to indicate that all new 686 * operations require another mount operation 687 */ 688 void 689 st_unmount(struct st_softc *st, int eject, int rewind) 690 { 691 struct scsi_link *sc_link = st->sc_link; 692 int nmarks; 693 694 st->media_fileno = -1; 695 st->media_blkno = -1; 696 697 if (!(st->flags & ST_MOUNTED)) 698 return; 699 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 700 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 701 if (rewind) 702 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 703 scsi_prevent(sc_link, PR_ALLOW, 704 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 705 if (eject) 706 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 707 st->flags &= ~ST_MOUNTED; 708 sc_link->flags &= ~SDEV_MEDIA_LOADED; 709 } 710 711 /* 712 * Given all we know about the device, media, mode, 'quirks' and 713 * initial operation, make a decision as to how we should be set 714 * to run (regarding blocking and EOD marks) 715 */ 716 int 717 st_decide_mode(struct st_softc *st, int first_read) 718 { 719 struct scsi_link *sc_link = st->sc_link; 720 721 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 722 723 /* ATAPI tapes are always fixed blocksize. */ 724 if (sc_link->flags & SDEV_ATAPI) { 725 st->flags |= ST_FIXEDBLOCKS; 726 if (st->media_blksize > 0) 727 st->blksize = st->media_blksize; 728 else 729 st->blksize = DEF_FIXED_BSIZE; 730 goto done; 731 } 732 733 /* 734 * If the drive can only handle fixed-length blocks and only at 735 * one size, perhaps we should just do that. 736 */ 737 if (st->blkmin && (st->blkmin == st->blkmax)) { 738 st->flags |= ST_FIXEDBLOCKS; 739 st->blksize = st->blkmin; 740 SC_DEBUG(sc_link, SDEV_DB3, 741 ("blkmin == blkmax of %d\n", st->blkmin)); 742 goto done; 743 } 744 /* 745 * If the tape density mandates (or even suggests) use of fixed 746 * or variable-length blocks, comply. 747 */ 748 switch (st->density) { 749 case HALFINCH_800: 750 case HALFINCH_1600: 751 case HALFINCH_6250: 752 case DDS: 753 st->flags &= ~ST_FIXEDBLOCKS; 754 st->blksize = 0; 755 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 756 goto done; 757 case QIC_11: 758 case QIC_24: 759 case QIC_120: 760 case QIC_150: 761 case QIC_525: 762 case QIC_1320: 763 st->flags |= ST_FIXEDBLOCKS; 764 if (st->media_blksize > 0) 765 st->blksize = st->media_blksize; 766 else 767 st->blksize = DEF_FIXED_BSIZE; 768 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 769 goto done; 770 } 771 /* 772 * If we're about to read the tape, perhaps we should choose 773 * fixed or variable-length blocks and block size according to 774 * what the drive found on the tape. 775 */ 776 if (first_read && 777 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 778 (st->media_blksize == DEF_FIXED_BSIZE) || 779 (st->media_blksize == 1024))) { 780 if (st->media_blksize > 0) 781 st->flags |= ST_FIXEDBLOCKS; 782 else 783 st->flags &= ~ST_FIXEDBLOCKS; 784 st->blksize = st->media_blksize; 785 SC_DEBUG(sc_link, SDEV_DB3, 786 ("Used media_blksize of %d\n", st->media_blksize)); 787 goto done; 788 } 789 /* 790 * We're getting no hints from any direction. Choose variable- 791 * length blocks arbitrarily. 792 */ 793 st->flags &= ~ST_FIXEDBLOCKS; 794 st->blksize = 0; 795 SC_DEBUG(sc_link, SDEV_DB3, 796 ("Give up and default to variable mode\n")); 797 798 done: 799 /* 800 * Decide whether or not to write two file marks to signify end- 801 * of-data. Make the decision as a function of density. If 802 * the decision is not to use a second file mark, the SCSI BLANK 803 * CHECK condition code will be recognized as end-of-data when 804 * first read. 805 * (I think this should be a by-product of fixed/variable..julian) 806 */ 807 switch (st->density) { 808 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 809 case QIC_11: 810 case QIC_24: 811 case QIC_120: 812 case QIC_150: 813 case QIC_525: 814 case QIC_1320: 815 st->flags &= ~ST_2FM_AT_EOD; 816 break; 817 default: 818 st->flags |= ST_2FM_AT_EOD; 819 } 820 return 0; 821 } 822 823 /* 824 * Actually translate the requested transfer into 825 * one the physical driver can understand 826 * The transfer is described by a buf and will include 827 * only one physical transfer. 828 */ 829 void 830 ststrategy(struct buf *bp) 831 { 832 struct scsi_link *sc_link; 833 struct st_softc *st; 834 struct buf *dp; 835 int error, s; 836 837 st = stlookup(STUNIT(bp->b_dev)); 838 if (st == NULL) 839 return; 840 if (st->flags & ST_DYING) { 841 error = ENXIO; 842 goto done; 843 } 844 sc_link = st->sc_link; 845 846 SC_DEBUG(sc_link, SDEV_DB2, ("ststrategy: %ld bytes @ blk %d\n", 847 bp->b_bcount, bp->b_blkno)); 848 849 if (st->flags & ST_DYING) { 850 bp->b_error = ENXIO; 851 goto bad; 852 } 853 /* 854 * If it's a null transfer, return immediately. 855 */ 856 if (bp->b_bcount == 0) 857 goto done; 858 /* 859 * Odd sized request on fixed drives are verboten 860 */ 861 if (st->flags & ST_FIXEDBLOCKS) { 862 if (bp->b_bcount % st->blksize) { 863 printf("%s: bad request, must be multiple of %d\n", 864 st->sc_dev.dv_xname, st->blksize); 865 bp->b_error = EIO; 866 goto bad; 867 } 868 } 869 /* 870 * as are out-of-range requests on variable drives. 871 */ 872 else if (bp->b_bcount < st->blkmin || 873 (st->blkmax && bp->b_bcount > st->blkmax)) { 874 printf("%s: bad request, must be between %d and %d\n", 875 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 876 bp->b_error = EIO; 877 goto bad; 878 } 879 s = splbio(); 880 881 /* 882 * Place it in the queue of activities for this tape 883 * at the end (a bit silly because we only have on user.. 884 * (but it could fork())) 885 */ 886 dp = &st->buf_queue; 887 bp->b_actf = NULL; 888 bp->b_actb = dp->b_actb; 889 *dp->b_actb = bp; 890 dp->b_actb = &bp->b_actf; 891 892 /* 893 * Tell the device to get going on the transfer if it's 894 * not doing anything, otherwise just wait for completion 895 * (All a bit silly if we're only allowing 1 open but..) 896 */ 897 ststart(st); 898 899 splx(s); 900 device_unref(&st->sc_dev); 901 return; 902 bad: 903 bp->b_flags |= B_ERROR; 904 done: 905 device_unref(&st->sc_dev); 906 /* 907 * Correctly set the buf to indicate a completed xfer 908 */ 909 bp->b_resid = bp->b_bcount; 910 s = splbio(); 911 biodone(bp); 912 splx(s); 913 } 914 915 /* 916 * ststart looks to see if there is a buf waiting for the device 917 * and that the device is not already busy. If both are true, 918 * It dequeues the buf and creates a scsi command to perform the 919 * transfer required. The transfer request will call scsi_done 920 * on completion, which will in turn call this routine again 921 * so that the next queued transfer is performed. 922 * The bufs are queued by the strategy routine (ststrategy) 923 * 924 * This routine is also called after other non-queued requests 925 * have been made of the scsi driver, to ensure that the queue 926 * continues to be drained. 927 * ststart() is called at splbio from ststrategy, strestart and scsi_done() 928 */ 929 void 930 ststart(void *v) 931 { 932 struct st_softc *st = v; 933 struct scsi_link *sc_link = st->sc_link; 934 struct buf *bp, *dp; 935 struct scsi_rw_tape cmd; 936 int flags, error; 937 938 SC_DEBUG(sc_link, SDEV_DB2, ("ststart\n")); 939 940 if (st->flags & ST_DYING) 941 return; 942 943 splassert(IPL_BIO); 944 945 /* 946 * See if there is a buf to do and we are not already 947 * doing one 948 */ 949 while (sc_link->openings > 0) { 950 /* if a special awaits, let it proceed first */ 951 if (sc_link->flags & SDEV_WAITING) { 952 sc_link->flags &= ~SDEV_WAITING; 953 wakeup((caddr_t)sc_link); 954 return; 955 } 956 957 dp = &st->buf_queue; 958 if ((bp = dp->b_actf) == NULL) 959 return; 960 if ((dp = bp->b_actf) != NULL) 961 dp->b_actb = bp->b_actb; 962 else 963 st->buf_queue.b_actb = bp->b_actb; 964 *bp->b_actb = dp; 965 966 /* 967 * if the device has been unmounted by the user 968 * then throw away all requests until done 969 */ 970 if (!(st->flags & ST_MOUNTED) || 971 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 972 /* make sure that one implies the other.. */ 973 sc_link->flags &= ~SDEV_MEDIA_LOADED; 974 bp->b_flags |= B_ERROR; 975 bp->b_resid = bp->b_bcount; 976 bp->b_error = EIO; 977 biodone(bp); 978 continue; 979 } 980 /* 981 * only FIXEDBLOCK devices have pending operations 982 */ 983 if (st->flags & ST_FIXEDBLOCKS) { 984 /* 985 * If we are at a filemark but have not reported it yet 986 * then we should report it now 987 */ 988 if (st->flags & ST_AT_FILEMARK) { 989 if ((bp->b_flags & B_READ) == B_WRITE) { 990 /* 991 * Handling of ST_AT_FILEMARK in 992 * st_space will fill in the right file 993 * mark count. 994 * Back up over filemark 995 */ 996 if (st_space(st, 0, SP_FILEMARKS, 0)) { 997 bp->b_flags |= B_ERROR; 998 bp->b_resid = bp->b_bcount; 999 bp->b_error = EIO; 1000 biodone(bp); 1001 continue; 1002 } 1003 } else { 1004 bp->b_resid = bp->b_bcount; 1005 bp->b_error = 0; 1006 bp->b_flags &= ~B_ERROR; 1007 st->flags &= ~ST_AT_FILEMARK; 1008 biodone(bp); 1009 continue; /* seek more work */ 1010 } 1011 } 1012 /* 1013 * If we are at EIO (e.g. EOM) but have not reported it 1014 * yet then we should report it now 1015 */ 1016 if (st->flags & ST_EIO_PENDING) { 1017 bp->b_resid = bp->b_bcount; 1018 bp->b_error = EIO; 1019 bp->b_flags |= B_ERROR; 1020 st->flags &= ~ST_EIO_PENDING; 1021 biodone(bp); 1022 continue; /* seek more work */ 1023 } 1024 } 1025 1026 /* 1027 * Fill out the scsi command 1028 */ 1029 bzero(&cmd, sizeof(cmd)); 1030 if ((bp->b_flags & B_READ) == B_WRITE) { 1031 cmd.opcode = WRITE; 1032 st->flags &= ~ST_FM_WRITTEN; 1033 st->flags |= ST_WRITTEN; 1034 flags = SCSI_DATA_OUT; 1035 } else { 1036 cmd.opcode = READ; 1037 flags = SCSI_DATA_IN; 1038 } 1039 1040 /* 1041 * Handle "fixed-block-mode" tape drives by using the 1042 * block count instead of the length. 1043 */ 1044 if (st->flags & ST_FIXEDBLOCKS) { 1045 cmd.byte2 |= SRW_FIXED; 1046 _lto3b(bp->b_bcount / st->blksize, cmd.len); 1047 } else 1048 _lto3b(bp->b_bcount, cmd.len); 1049 1050 if (st->media_blkno != -1) { 1051 /* Update block count now, errors will set it to -1. */ 1052 if (st->flags & ST_FIXEDBLOCKS) 1053 st->media_blkno += _3btol(cmd.len); 1054 else if (cmd.len != 0) 1055 st->media_blkno++; 1056 } 1057 1058 /* 1059 * go ask the adapter to do all this for us 1060 */ 1061 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1062 sizeof(cmd), (u_char *) bp->b_data, bp->b_bcount, 0, 1063 ST_IO_TIME, bp, flags | SCSI_NOSLEEP); 1064 switch (error) { 1065 case 0: 1066 timeout_del(&st->sc_timeout); 1067 break; 1068 case EAGAIN: 1069 /* 1070 * The device can't start another i/o. Try again later. 1071 */ 1072 dp->b_actf = bp; 1073 timeout_add(&st->sc_timeout, 1); 1074 return; 1075 default: 1076 printf("%s: not queued\n", st->sc_dev.dv_xname); 1077 break; 1078 } 1079 } /* go back and see if we can cram more work in.. */ 1080 } 1081 1082 void 1083 strestart(void *v) 1084 { 1085 int s; 1086 1087 s = splbio(); 1088 ststart(v); 1089 splx(s); 1090 } 1091 1092 void 1093 stminphys(struct buf *bp) 1094 { 1095 struct st_softc *st; 1096 1097 st = stlookup(STUNIT(bp->b_dev)); 1098 if (st == NULL) 1099 return; /* can't happen */ 1100 1101 (*st->sc_link->adapter->scsi_minphys)(bp, st->sc_link); 1102 1103 device_unref(&st->sc_dev); 1104 } 1105 1106 int 1107 stread(dev_t dev, struct uio *uio, int iomode) 1108 { 1109 struct st_softc *st; 1110 1111 st = stlookup(STUNIT(dev)); 1112 if (st == NULL) 1113 return (ENXIO); 1114 1115 if (st->flags & ST_DYING) { 1116 device_unref(&st->sc_dev); 1117 return (ENXIO); 1118 } 1119 1120 return (physio(ststrategy, NULL, dev, B_READ, stminphys, uio)); 1121 } 1122 1123 int 1124 stwrite(dev_t dev, struct uio *uio, int iomode) 1125 { 1126 struct st_softc *st; 1127 1128 st = stlookup(STUNIT(dev)); 1129 if (st == NULL) 1130 return (ENXIO); 1131 1132 if (st->flags & ST_DYING) { 1133 device_unref(&st->sc_dev); 1134 return (ENXIO); 1135 } 1136 1137 return (physio(ststrategy, NULL, dev, B_WRITE, stminphys, uio)); 1138 } 1139 1140 /* 1141 * Perform special action on behalf of the user; 1142 * knows about the internals of this device 1143 */ 1144 int 1145 stioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct proc *p) 1146 { 1147 int error = 0; 1148 int nmarks; 1149 int flags = 0; 1150 struct st_softc *st; 1151 int hold_blksize; 1152 u_int8_t hold_density; 1153 struct mtop *mt = (struct mtop *) arg; 1154 int number; 1155 1156 /* 1157 * Find the device that the user is talking about 1158 */ 1159 st = stlookup(STUNIT(dev)); 1160 if (st == NULL) 1161 return (ENXIO); 1162 1163 if (st->flags & ST_DYING) { 1164 error = ENXIO; 1165 goto done; 1166 } 1167 1168 hold_blksize = st->blksize; 1169 hold_density = st->density; 1170 1171 switch (cmd) { 1172 1173 case MTIOCGET: { 1174 struct mtget *g = (struct mtget *) arg; 1175 1176 /* 1177 * (to get the current state of READONLY) 1178 */ 1179 error = st_mode_sense(st, SCSI_SILENT); 1180 if (error) 1181 break; 1182 1183 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1184 bzero(g, sizeof(struct mtget)); 1185 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1186 g->mt_blksiz = st->blksize; 1187 g->mt_density = st->density; 1188 g->mt_mblksiz = st->modes.blksize; 1189 g->mt_mdensity = st->modes.density; 1190 if (st->flags & ST_READONLY) 1191 g->mt_dsreg |= MT_DS_RDONLY; 1192 if (st->flags & ST_MOUNTED) 1193 g->mt_dsreg |= MT_DS_MOUNTED; 1194 g->mt_resid = st->mt_resid; 1195 g->mt_erreg = st->mt_erreg; 1196 g->mt_fileno = st->media_fileno; 1197 g->mt_blkno = st->media_blkno; 1198 /* 1199 * clear latched errors. 1200 */ 1201 st->mt_resid = 0; 1202 st->mt_erreg = 0; 1203 break; 1204 } 1205 case MTIOCTOP: { 1206 1207 SC_DEBUG(st->sc_link, SDEV_DB1, 1208 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); 1209 1210 number = mt->mt_count; 1211 switch (mt->mt_op) { 1212 case MTWEOF: /* write an end-of-file record */ 1213 error = st_write_filemarks(st, number, flags); 1214 break; 1215 case MTBSF: /* backward space file */ 1216 number = -number; 1217 case MTFSF: /* forward space file */ 1218 error = st_check_eod(st, FALSE, &nmarks, flags); 1219 if (!error) 1220 error = st_space(st, number - nmarks, 1221 SP_FILEMARKS, flags); 1222 break; 1223 case MTBSR: /* backward space record */ 1224 number = -number; 1225 case MTFSR: /* forward space record */ 1226 error = st_check_eod(st, TRUE, &nmarks, flags); 1227 if (!error) 1228 error = st_space(st, number, SP_BLKS, flags); 1229 break; 1230 case MTREW: /* rewind */ 1231 error = st_rewind(st, 0, flags); 1232 break; 1233 case MTOFFL: /* rewind and put the drive offline */ 1234 st_unmount(st, EJECT, DOREWIND); 1235 break; 1236 case MTNOP: /* no operation, sets status only */ 1237 break; 1238 case MTRETEN: /* retension the tape */ 1239 error = st_load(st, LD_RETENSION, flags); 1240 if (!error) 1241 error = st_load(st, LD_LOAD, flags); 1242 break; 1243 case MTEOM: /* forward space to end of media */ 1244 error = st_check_eod(st, FALSE, &nmarks, flags); 1245 if (!error) 1246 error = st_space(st, 1, SP_EOM, flags); 1247 break; 1248 case MTCACHE: /* enable controller cache */ 1249 st->flags &= ~ST_DONTBUFFER; 1250 goto try_new_value; 1251 case MTNOCACHE: /* disable controller cache */ 1252 st->flags |= ST_DONTBUFFER; 1253 goto try_new_value; 1254 case MTERASE: /* erase volume */ 1255 error = st_erase(st, number, flags); 1256 break; 1257 case MTSETBSIZ: /* Set block size for device */ 1258 if (number == 0) { 1259 st->flags &= ~ST_FIXEDBLOCKS; 1260 } else { 1261 if ((st->blkmin || st->blkmax) && 1262 (number < st->blkmin || 1263 number > st->blkmax)) { 1264 error = EINVAL; 1265 break; 1266 } 1267 st->flags |= ST_FIXEDBLOCKS; 1268 } 1269 st->blksize = number; 1270 st->flags |= ST_BLOCK_SET; /*XXX */ 1271 goto try_new_value; 1272 1273 case MTSETDNSTY: /* Set density for device and mode */ 1274 if (number < 0 || number > SCSI_MAX_DENSITY_CODE) { 1275 error = EINVAL; 1276 break; 1277 } else 1278 st->density = number; 1279 goto try_new_value; 1280 1281 default: 1282 error = EINVAL; 1283 } 1284 break; 1285 } 1286 case MTIOCIEOT: 1287 case MTIOCEEOT: 1288 break; 1289 1290 #if 0 1291 case MTIOCRDSPOS: 1292 error = st_rdpos(st, 0, (u_int32_t *) arg); 1293 break; 1294 1295 case MTIOCRDHPOS: 1296 error = st_rdpos(st, 1, (u_int32_t *) arg); 1297 break; 1298 1299 case MTIOCSLOCATE: 1300 error = st_setpos(st, 0, (u_int32_t *) arg); 1301 break; 1302 1303 case MTIOCHLOCATE: 1304 error = st_setpos(st, 1, (u_int32_t *) arg); 1305 break; 1306 #endif 1307 1308 default: 1309 error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p); 1310 break; 1311 } 1312 goto done; 1313 1314 try_new_value: 1315 /* 1316 * Check that the mode being asked for is aggreeable to the 1317 * drive. If not, put it back the way it was. 1318 */ 1319 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */ 1320 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1321 st->density = hold_density; 1322 st->blksize = hold_blksize; 1323 if (st->blksize) 1324 st->flags |= ST_FIXEDBLOCKS; 1325 else 1326 st->flags &= ~ST_FIXEDBLOCKS; 1327 goto done; 1328 } 1329 /* 1330 * As the drive liked it, if we are setting a new default, 1331 * set it into the structures as such. 1332 */ 1333 switch (mt->mt_op) { 1334 case MTSETBSIZ: 1335 st->modes.blksize = st->blksize; 1336 st->modeflags |= BLKSIZE_SET_BY_USER; 1337 break; 1338 case MTSETDNSTY: 1339 st->modes.density = st->density; 1340 st->modeflags |= DENSITY_SET_BY_USER; 1341 break; 1342 } 1343 1344 done: 1345 device_unref(&st->sc_dev); 1346 return (error); 1347 } 1348 1349 /* 1350 * Do a synchronous read. 1351 */ 1352 int 1353 st_read(struct st_softc *st, char *buf, int size, int flags) 1354 { 1355 struct scsi_rw_tape cmd; 1356 1357 /* 1358 * If it's a null transfer, return immediately 1359 */ 1360 if (size == 0) 1361 return 0; 1362 bzero(&cmd, sizeof(cmd)); 1363 cmd.opcode = READ; 1364 if (st->flags & ST_FIXEDBLOCKS) { 1365 cmd.byte2 |= SRW_FIXED; 1366 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1367 cmd.len); 1368 } else 1369 _lto3b(size, cmd.len); 1370 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1371 sizeof(cmd), (u_char *) buf, size, 0, ST_IO_TIME, NULL, 1372 flags | SCSI_DATA_IN); 1373 } 1374 1375 /* 1376 * Ask the drive what its min and max blk sizes are. 1377 */ 1378 int 1379 st_read_block_limits(struct st_softc *st, int flags) 1380 { 1381 struct scsi_block_limits cmd; 1382 struct scsi_block_limits_data block_limits; 1383 struct scsi_link *sc_link = st->sc_link; 1384 int error; 1385 1386 /* 1387 * First check if we have it all loaded 1388 */ 1389 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1390 return 0; 1391 1392 /* 1393 * do a 'Read Block Limits' 1394 */ 1395 bzero(&cmd, sizeof(cmd)); 1396 cmd.opcode = READ_BLOCK_LIMITS; 1397 1398 /* 1399 * do the command, update the global values 1400 */ 1401 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1402 sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), 1403 SCSI_RETRIES, ST_CTL_TIME, NULL, flags | SCSI_DATA_IN); 1404 if (error) 1405 return error; 1406 1407 st->blkmin = _2btol(block_limits.min_length); 1408 st->blkmax = _3btol(block_limits.max_length); 1409 1410 SC_DEBUG(sc_link, SDEV_DB3, 1411 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1412 return 0; 1413 } 1414 1415 /* 1416 * Get the scsi driver to send a full inquiry to the 1417 * device and use the results to fill out the global 1418 * parameter structure. 1419 * 1420 * called from: 1421 * attach 1422 * open 1423 * ioctl (to reset original blksize) 1424 */ 1425 int 1426 st_mode_sense(struct st_softc *st, int flags) 1427 { 1428 union scsi_mode_sense_buf *data; 1429 struct scsi_link *sc_link = st->sc_link; 1430 u_int64_t block_count; 1431 u_int32_t density, block_size; 1432 u_char *page0 = NULL; 1433 u_int8_t dev_spec; 1434 int error, big; 1435 1436 data = malloc(sizeof(*data), M_TEMP, M_NOWAIT); 1437 if (data == NULL) 1438 return (ENOMEM); 1439 1440 /* 1441 * Ask for page 0 (vendor specific) mode sense data. 1442 */ 1443 error = scsi_do_mode_sense(sc_link, 0, data, (void **)&page0, 1444 &density, &block_count, &block_size, 1, flags | SCSI_SILENT, &big); 1445 if (error != 0) { 1446 free(data, M_TEMP); 1447 return (error); 1448 } 1449 1450 /* It is valid for no page0 to be available. */ 1451 1452 if (big) 1453 dev_spec = data->hdr_big.dev_spec; 1454 else 1455 dev_spec = data->hdr.dev_spec; 1456 1457 if (dev_spec & SMH_DSP_WRITE_PROT) 1458 st->flags |= ST_READONLY; 1459 else 1460 st->flags &= ~ST_READONLY; 1461 1462 st->numblks = block_count; 1463 st->media_blksize = block_size; 1464 st->media_density = density; 1465 1466 SC_DEBUG(sc_link, SDEV_DB3, 1467 ("density code 0x%x, %d-byte blocks, write-%s, ", 1468 st->media_density, st->media_blksize, 1469 st->flags & ST_READONLY ? "protected" : "enabled")); 1470 SC_DEBUGN(sc_link, SDEV_DB3, 1471 ("%sbuffered\n", dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1472 1473 sc_link->flags |= SDEV_MEDIA_LOADED; 1474 1475 free(data, M_TEMP); 1476 return (0); 1477 } 1478 1479 /* 1480 * Send a filled out parameter structure to the drive to 1481 * set it into the desire modes etc. 1482 */ 1483 int 1484 st_mode_select(struct st_softc *st, int flags) 1485 { 1486 union scsi_mode_sense_buf *inbuf, *outbuf; 1487 struct scsi_blk_desc general; 1488 struct scsi_link *sc_link = st->sc_link; 1489 u_int8_t *page0 = NULL; 1490 int error, big, page0_size; 1491 1492 inbuf = malloc(sizeof(*inbuf), M_TEMP, M_NOWAIT); 1493 if (inbuf == NULL) 1494 return (ENOMEM); 1495 outbuf = malloc(sizeof(*outbuf), M_TEMP, M_NOWAIT | M_ZERO); 1496 if (outbuf == NULL) { 1497 free(inbuf, M_TEMP); 1498 return (ENOMEM); 1499 } 1500 1501 /* 1502 * This quirk deals with drives that have only one valid mode and think 1503 * this gives them license to reject all mode selects, even if the 1504 * selected mode is the one that is supported. 1505 */ 1506 if (st->quirks & ST_Q_UNIMODAL) { 1507 SC_DEBUG(sc_link, SDEV_DB3, 1508 ("not setting density 0x%x blksize 0x%x\n", 1509 st->density, st->blksize)); 1510 free(inbuf, M_TEMP); 1511 free(outbuf, M_TEMP); 1512 return (0); 1513 } 1514 1515 if (sc_link->flags & SDEV_ATAPI) { 1516 free(inbuf, M_TEMP); 1517 free(outbuf, M_TEMP); 1518 return (0); 1519 } 1520 1521 bzero(&general, sizeof(general)); 1522 1523 general.density = st->density; 1524 if (st->flags & ST_FIXEDBLOCKS) 1525 _lto3b(st->blksize, general.blklen); 1526 1527 /* 1528 * Ask for page 0 (vendor specific) mode sense data. 1529 */ 1530 error = scsi_do_mode_sense(sc_link, 0, inbuf, (void **)&page0, NULL, 1531 NULL, NULL, 1, flags | SCSI_SILENT, &big); 1532 if (error != 0) { 1533 free(inbuf, M_TEMP); 1534 free(outbuf, M_TEMP); 1535 return (error); 1536 } 1537 1538 if (page0 == NULL) { 1539 page0_size = 0; 1540 } else if (big == 0) { 1541 page0_size = inbuf->hdr.data_length + 1542 sizeof(inbuf->hdr.data_length) - sizeof(inbuf->hdr) - 1543 inbuf->hdr.blk_desc_len; 1544 memcpy(&outbuf->buf[sizeof(outbuf->hdr)+ sizeof(general)], 1545 page0, page0_size); 1546 } else { 1547 page0_size = _2btol(inbuf->hdr_big.data_length) + 1548 sizeof(inbuf->hdr_big.data_length) - 1549 sizeof(inbuf->hdr_big) - 1550 _2btol(inbuf->hdr_big.blk_desc_len); 1551 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big) + sizeof(general)], 1552 page0, page0_size); 1553 } 1554 1555 /* 1556 * Set up for a mode select. 1557 */ 1558 if (big == 0) { 1559 outbuf->hdr.data_length = sizeof(outbuf->hdr) + 1560 sizeof(general) + page0_size - 1561 sizeof(outbuf->hdr.data_length); 1562 if ((st->flags & ST_DONTBUFFER) == 0) 1563 outbuf->hdr.dev_spec = SMH_DSP_BUFF_MODE_ON; 1564 outbuf->hdr.blk_desc_len = sizeof(general); 1565 memcpy(&outbuf->buf[sizeof(outbuf->hdr)], 1566 &general, sizeof(general)); 1567 error = scsi_mode_select(st->sc_link, 0, &outbuf->hdr, 1568 flags, ST_CTL_TIME); 1569 free(inbuf, M_TEMP); 1570 free(outbuf, M_TEMP); 1571 return (error); 1572 } 1573 1574 /* MODE SENSE (10) header was returned, so use MODE SELECT (10). */ 1575 _lto2b((sizeof(outbuf->hdr_big) + sizeof(general) + page0_size - 1576 sizeof(outbuf->hdr_big.data_length)), outbuf->hdr_big.data_length); 1577 if ((st->flags & ST_DONTBUFFER) == 0) 1578 outbuf->hdr_big.dev_spec = SMH_DSP_BUFF_MODE_ON; 1579 _lto2b(sizeof(general), outbuf->hdr_big.blk_desc_len); 1580 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big)], &general, 1581 sizeof(general)); 1582 1583 error = scsi_mode_select_big(st->sc_link, 0, &outbuf->hdr_big, 1584 flags, ST_CTL_TIME); 1585 free(inbuf, M_TEMP); 1586 free(outbuf, M_TEMP); 1587 return (error); 1588 } 1589 1590 /* 1591 * issue an erase command 1592 */ 1593 int 1594 st_erase(struct st_softc *st, int full, int flags) 1595 { 1596 struct scsi_erase cmd; 1597 int tmo; 1598 1599 /* 1600 * Full erase means set LONG bit in erase command, which asks 1601 * the drive to erase the entire unit. Without this bit, we're 1602 * asking the drive to write an erase gap. 1603 */ 1604 bzero(&cmd, sizeof(cmd)); 1605 cmd.opcode = ERASE; 1606 if (full) { 1607 cmd.byte2 = SE_IMMED|SE_LONG; 1608 tmo = ST_SPC_TIME; 1609 } else { 1610 cmd.byte2 = SE_IMMED; 1611 tmo = ST_IO_TIME; 1612 } 1613 1614 /* 1615 * XXX We always do this asynchronously, for now. How long should 1616 * we wait if we want to (eventually) to it synchronously? 1617 */ 1618 return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *)&cmd, 1619 sizeof(cmd), 0, 0, SCSI_RETRIES, tmo, NULL, flags)); 1620 } 1621 1622 /* 1623 * skip N blocks/filemarks/seq filemarks/eom 1624 */ 1625 int 1626 st_space(struct st_softc *st, int number, u_int what, int flags) 1627 { 1628 struct scsi_space cmd; 1629 int error; 1630 1631 switch (what) { 1632 case SP_BLKS: 1633 if (st->flags & ST_PER_ACTION) { 1634 if (number > 0) { 1635 st->flags &= ~ST_PER_ACTION; 1636 return EIO; 1637 } else if (number < 0) { 1638 if (st->flags & ST_AT_FILEMARK) { 1639 /* 1640 * Handling of ST_AT_FILEMARK 1641 * in st_space will fill in the 1642 * right file mark count. 1643 */ 1644 error = st_space(st, 0, SP_FILEMARKS, 1645 flags); 1646 if (error) 1647 return error; 1648 } 1649 if (st->flags & ST_BLANK_READ) { 1650 st->flags &= ~ST_BLANK_READ; 1651 return EIO; 1652 } 1653 st->flags &= ~ST_EIO_PENDING; 1654 } 1655 } 1656 break; 1657 case SP_FILEMARKS: 1658 if (st->flags & ST_EIO_PENDING) { 1659 if (number > 0) { 1660 /* pretend we just discovered the error */ 1661 st->flags &= ~ST_EIO_PENDING; 1662 return EIO; 1663 } else if (number < 0) { 1664 /* back away from the error */ 1665 st->flags &= ~ST_EIO_PENDING; 1666 } 1667 } 1668 if (st->flags & ST_AT_FILEMARK) { 1669 st->flags &= ~ST_AT_FILEMARK; 1670 number--; 1671 } 1672 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1673 /* back away from unwritten tape */ 1674 st->flags &= ~ST_BLANK_READ; 1675 number++; /* XXX dubious */ 1676 } 1677 break; 1678 case SP_EOM: 1679 if (st->flags & ST_EIO_PENDING) { 1680 /* pretend we just discovered the error */ 1681 st->flags &= ~ST_EIO_PENDING; 1682 return EIO; 1683 } 1684 if (st->flags & ST_AT_FILEMARK) 1685 st->flags &= ~ST_AT_FILEMARK; 1686 break; 1687 } 1688 if (number == 0) 1689 return 0; 1690 1691 bzero(&cmd, sizeof(cmd)); 1692 cmd.opcode = SPACE; 1693 cmd.byte2 = what; 1694 _lto3b(number, cmd.number); 1695 1696 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1697 sizeof(cmd), 0, 0, 0, ST_SPC_TIME, NULL, flags); 1698 1699 if (error != 0) { 1700 st->media_fileno = -1; 1701 st->media_blkno = -1; 1702 } else { 1703 switch (what) { 1704 case SP_BLKS: 1705 if (st->media_blkno != -1) { 1706 st->media_blkno += number; 1707 if (st->media_blkno < 0) 1708 st->media_blkno = -1; 1709 } 1710 break; 1711 case SP_FILEMARKS: 1712 if (st->media_fileno != -1) { 1713 st->media_fileno += number; 1714 st->media_blkno = 0; 1715 } 1716 break; 1717 default: 1718 st->media_fileno = -1; 1719 st->media_blkno = -1; 1720 break; 1721 } 1722 } 1723 1724 return (error); 1725 } 1726 1727 /* 1728 * write N filemarks 1729 */ 1730 int 1731 st_write_filemarks(struct st_softc *st, int number, int flags) 1732 { 1733 struct scsi_write_filemarks cmd; 1734 int error; 1735 1736 /* 1737 * It's hard to write a negative number of file marks. 1738 * Don't try. 1739 */ 1740 if (number < 0) 1741 return EINVAL; 1742 switch (number) { 1743 case 0: /* really a command to sync the drive's buffers */ 1744 break; 1745 case 1: 1746 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1747 st->flags &= ~ST_WRITTEN; 1748 else 1749 st->flags |= ST_FM_WRITTEN; 1750 st->flags &= ~ST_PER_ACTION; 1751 break; 1752 default: 1753 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1754 } 1755 1756 bzero(&cmd, sizeof(cmd)); 1757 cmd.opcode = WRITE_FILEMARKS; 1758 _lto3b(number, cmd.number); 1759 1760 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1761 sizeof(cmd), 0, 0, 0, ST_IO_TIME * 4, NULL, flags); 1762 1763 if (error != 0) { 1764 st->media_fileno = -1; 1765 st->media_blkno = -1; 1766 } else if (st->media_fileno != -1) { 1767 st->media_fileno += number; 1768 st->media_blkno = 0; 1769 } 1770 1771 return (error); 1772 } 1773 1774 /* 1775 * Make sure the right number of file marks is on tape if the 1776 * tape has been written. If the position argument is true, 1777 * leave the tape positioned where it was originally. 1778 * 1779 * nmarks returns the number of marks to skip (or, if position 1780 * true, which were skipped) to get back original position. 1781 */ 1782 int 1783 st_check_eod(struct st_softc *st, int position, int *nmarks, int flags) 1784 { 1785 int error; 1786 1787 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1788 default: 1789 *nmarks = 0; 1790 return 0; 1791 case ST_WRITTEN: 1792 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1793 *nmarks = 1; 1794 break; 1795 case ST_WRITTEN | ST_2FM_AT_EOD: 1796 *nmarks = 2; 1797 } 1798 error = st_write_filemarks(st, *nmarks, flags); 1799 if (position && !error) 1800 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1801 return error; 1802 } 1803 1804 /* 1805 * load/unload/retension 1806 */ 1807 int 1808 st_load(struct st_softc *st, u_int type, int flags) 1809 { 1810 struct scsi_load cmd; 1811 1812 st->media_fileno = -1; 1813 st->media_blkno = -1; 1814 1815 if (type != LD_LOAD) { 1816 int error; 1817 int nmarks; 1818 1819 error = st_check_eod(st, FALSE, &nmarks, flags); 1820 if (error) 1821 return error; 1822 } 1823 if (st->quirks & ST_Q_IGNORE_LOADS) { 1824 if (type == LD_LOAD) { 1825 /* 1826 * If we ignore loads, at least we should try a rewind. 1827 */ 1828 return st_rewind(st, 0, flags); 1829 } 1830 return (0); 1831 } 1832 1833 1834 bzero(&cmd, sizeof(cmd)); 1835 cmd.opcode = LOAD; 1836 cmd.how = type; 1837 1838 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1839 sizeof(cmd), 0, 0, SCSI_RETRIES, ST_SPC_TIME, NULL, flags); 1840 } 1841 1842 /* 1843 * Rewind the device 1844 */ 1845 int 1846 st_rewind(struct st_softc *st, u_int immediate, int flags) 1847 { 1848 struct scsi_rewind cmd; 1849 int error; 1850 int nmarks; 1851 1852 error = st_check_eod(st, FALSE, &nmarks, flags); 1853 if (error) 1854 return error; 1855 st->flags &= ~ST_PER_ACTION; 1856 1857 bzero(&cmd, sizeof(cmd)); 1858 cmd.opcode = REWIND; 1859 cmd.byte2 = immediate; 1860 1861 error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1862 sizeof(cmd), 0, 0, SCSI_RETRIES, 1863 immediate ? ST_CTL_TIME: ST_SPC_TIME, NULL, flags); 1864 1865 if (error == 0) { 1866 st->media_fileno = 0; 1867 st->media_blkno = 0; 1868 } 1869 1870 return (error); 1871 } 1872 1873 /* 1874 * Look at the returned sense and act on the error and detirmine 1875 * The unix error number to pass back... (0 = report no error) 1876 * (-1 = continue processing) 1877 */ 1878 int 1879 st_interpret_sense(struct scsi_xfer *xs) 1880 { 1881 struct scsi_sense_data *sense = &xs->sense; 1882 struct scsi_link *sc_link = xs->sc_link; 1883 struct st_softc *st = sc_link->device_softc; 1884 struct buf *bp = xs->bp; 1885 u_int8_t serr = sense->error_code & SSD_ERRCODE; 1886 u_int8_t skey = sense->flags & SSD_KEY; 1887 int32_t info; 1888 1889 if (((sc_link->flags & SDEV_OPEN) == 0) || 1890 (serr != SSD_ERRCODE_CURRENT && serr != SSD_ERRCODE_DEFERRED)) 1891 return (EJUSTRETURN); /* let the generic code handle it */ 1892 1893 switch (skey) { 1894 1895 /* 1896 * We do custom processing in st for the unit becoming ready case. 1897 * in this case we do not allow xs->retries to be decremented 1898 * only on the "Unit Becoming Ready" case. This is because tape 1899 * drives report "Unit Becoming Ready" when loading media, etc. 1900 * and can take a long time. Rather than having a massive timeout 1901 * for all operations (which would cause other problems) we allow 1902 * operations to wait (but be interruptable with Ctrl-C) forever 1903 * as long as the drive is reporting that it is becoming ready. 1904 * all other cases are handled as per the default. 1905 */ 1906 1907 case SKEY_NOT_READY: 1908 if ((xs->flags & SCSI_IGNORE_NOT_READY) != 0) 1909 return (0); 1910 switch (ASC_ASCQ(sense)) { 1911 case SENSE_NOT_READY_BECOMING_READY: 1912 SC_DEBUG(sc_link, SDEV_DB1, ("not ready: busy (%#x)\n", 1913 sense->add_sense_code_qual)); 1914 /* don't count this as a retry */ 1915 xs->retries++; 1916 return (scsi_delay(xs, 1)); 1917 default: 1918 return (EJUSTRETURN); 1919 } 1920 case SKEY_NO_SENSE: 1921 case SKEY_RECOVERED_ERROR: 1922 case SKEY_MEDIUM_ERROR: 1923 case SKEY_VOLUME_OVERFLOW: 1924 case SKEY_BLANK_CHECK: 1925 break; 1926 default: 1927 return (EJUSTRETURN); 1928 } 1929 1930 /* 1931 * Get the sense fields and work out what code 1932 */ 1933 if (sense->error_code & SSD_ERRCODE_VALID) 1934 info = _4btol(sense->info); 1935 else 1936 info = xs->datalen; /* bad choice if fixed blocks */ 1937 if (st->flags & ST_FIXEDBLOCKS) { 1938 xs->resid = info * st->blksize; 1939 if (sense->flags & SSD_EOM) { 1940 st->flags |= ST_EIO_PENDING; 1941 if (bp) 1942 bp->b_resid = xs->resid; 1943 } 1944 if (sense->flags & SSD_FILEMARK) { 1945 st->flags |= ST_AT_FILEMARK; 1946 if (st->media_fileno != -1) { 1947 st->media_fileno++; 1948 st->media_blkno = 0; 1949 } 1950 if (bp) 1951 bp->b_resid = xs->resid; 1952 } 1953 if (sense->flags & SSD_ILI) { 1954 st->flags |= ST_EIO_PENDING; 1955 if (bp) 1956 bp->b_resid = xs->resid; 1957 if (sense->error_code & SSD_ERRCODE_VALID && 1958 (xs->flags & SCSI_SILENT) == 0) 1959 printf("%s: block wrong size, %d blocks residual\n", 1960 st->sc_dev.dv_xname, info); 1961 1962 /* 1963 * This quirk code helps the drive read 1964 * the first tape block, regardless of 1965 * format. That is required for these 1966 * drives to return proper MODE SENSE 1967 * information. 1968 */ 1969 if ((st->quirks & ST_Q_SENSE_HELP) && 1970 !(sc_link->flags & SDEV_MEDIA_LOADED)) 1971 st->blksize -= 512; 1972 } 1973 /* 1974 * If no data was transferred, return immediately 1975 */ 1976 if (xs->resid >= xs->datalen) { 1977 if (st->flags & ST_EIO_PENDING) 1978 return EIO; 1979 if (st->flags & ST_AT_FILEMARK) { 1980 if (bp) 1981 bp->b_resid = xs->resid; 1982 return 0; 1983 } 1984 } 1985 } else { /* must be variable mode */ 1986 xs->resid = xs->datalen; /* to be sure */ 1987 if (sense->flags & SSD_EOM) 1988 return EIO; 1989 if (sense->flags & SSD_FILEMARK) { 1990 if (st->media_fileno != -1) { 1991 st->media_fileno++; 1992 st->media_blkno = 0; 1993 } 1994 if (bp) 1995 bp->b_resid = bp->b_bcount; 1996 return 0; 1997 } 1998 if (sense->flags & SSD_ILI) { 1999 if (info < 0) { 2000 /* 2001 * the record was bigger than the read 2002 */ 2003 if ((xs->flags & SCSI_SILENT) == 0) 2004 printf("%s: %d-byte record too big\n", 2005 st->sc_dev.dv_xname, 2006 xs->datalen - info); 2007 return (EIO); 2008 } else if (info > xs->datalen) { 2009 /* 2010 * huh? the residual is bigger than the request 2011 */ 2012 if ((xs->flags & SCSI_SILENT) == 0) 2013 printf( 2014 "%s: bad residual %d out of %d\n", 2015 st->sc_dev.dv_xname, info, 2016 xs->datalen); 2017 return (EIO); 2018 } 2019 xs->resid = info; 2020 if (bp) 2021 bp->b_resid = info; 2022 return (0); 2023 } 2024 } 2025 2026 if (skey == SKEY_BLANK_CHECK) { 2027 /* 2028 * This quirk code helps the drive read the first tape block, 2029 * regardless of format. That is required for these drives to 2030 * return proper MODE SENSE information. 2031 */ 2032 if ((st->quirks & ST_Q_SENSE_HELP) && 2033 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 2034 /* still starting */ 2035 st->blksize -= 512; 2036 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 2037 st->flags |= ST_BLANK_READ; 2038 xs->resid = xs->datalen; 2039 if (bp) { 2040 bp->b_resid = xs->resid; 2041 /* return an EOF */ 2042 } 2043 return (0); 2044 } 2045 } 2046 2047 return (EJUSTRETURN); 2048 } 2049 2050 /* 2051 * The quirk here is that the drive returns some value to st_mode_sense 2052 * incorrectly until the tape has actually passed by the head. 2053 * 2054 * The method is to set the drive to large fixed-block state (user-specified 2055 * density and 1024-byte blocks), then read and rewind to get it to sense the 2056 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 2057 * work, as a last resort, try variable- length blocks. The result will be 2058 * the ability to do an accurate st_mode_sense. 2059 * 2060 * We know we can do a rewind because we just did a load, which implies rewind. 2061 * Rewind seems preferable to space backward if we have a virgin tape. 2062 * 2063 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 2064 * error processing, both part of st_interpret_sense. 2065 */ 2066 int 2067 st_touch_tape(struct st_softc *st) 2068 { 2069 char *buf; 2070 int readsize; 2071 int error; 2072 2073 buf = malloc(1024, M_TEMP, M_NOWAIT); 2074 if (!buf) 2075 return ENOMEM; 2076 2077 if ((error = st_mode_sense(st, 0)) != 0) 2078 goto bad; 2079 st->blksize = 1024; 2080 do { 2081 switch (st->blksize) { 2082 case 512: 2083 case 1024: 2084 readsize = st->blksize; 2085 st->flags |= ST_FIXEDBLOCKS; 2086 break; 2087 default: 2088 readsize = 1; 2089 st->flags &= ~ST_FIXEDBLOCKS; 2090 } 2091 if ((error = st_mode_select(st, 0)) != 0) 2092 goto bad; 2093 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 2094 if ((error = st_rewind(st, 0, 0)) != 0) { 2095 bad: free(buf, M_TEMP); 2096 return error; 2097 } 2098 } while (readsize != 1 && readsize > st->blksize); 2099 2100 free(buf, M_TEMP); 2101 return 0; 2102 } 2103 2104 int 2105 stdump(dev_t dev, daddr64_t blkno, caddr_t va, size_t size) 2106 { 2107 2108 /* Not implemented. */ 2109 return ENXIO; 2110 } 2111 2112 /* 2113 * Remove unprocessed buffers from queue. 2114 */ 2115 void 2116 st_kill_buffers(struct st_softc *st) 2117 { 2118 struct buf *dp, *bp; 2119 int s; 2120 2121 s = splbio(); 2122 for (dp = &st->buf_queue; (bp = dp->b_actf) != NULL; ) { 2123 dp->b_actf = bp->b_actf; 2124 2125 bp->b_error = ENXIO; 2126 bp->b_flags |= B_ERROR; 2127 biodone(bp); 2128 } 2129 splx(s); 2130 } 2131