st.c revision 1.50
1/* $OpenBSD: st.c,v 1.50 2005/09/11 17:34:27 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/fcntl.h> 61#include <sys/errno.h> 62#include <sys/ioctl.h> 63#include <sys/malloc.h> 64#include <sys/buf.h> 65#include <sys/proc.h> 66#include <sys/user.h> 67#include <sys/mtio.h> 68#include <sys/device.h> 69#include <sys/conf.h> 70 71#include <scsi/scsi_all.h> 72#include <scsi/scsi_tape.h> 73#include <scsi/scsiconf.h> 74 75/* Defines for device specific stuff */ 76#define DEF_FIXED_BSIZE 512 77#define ST_RETRIES 4 /* only on non IO commands */ 78 79#define STMODE(z) ( minor(z) & 0x03) 80#define STDSTY(z) ((minor(z) >> 2) & 0x03) 81#define STUNIT(z) ((minor(z) >> 4) ) 82#define CTLMODE 3 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[4]; 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 {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */ 123 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */ 124 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */ 125 }}}, 126 {{T_SEQUENTIAL, T_REMOV, 127 "TANDBERG", " TDC 3600 ", ""}, {0, { 128 {0, 0, 0}, /* minor 0-3 */ 129 {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 130 {0, 0, QIC_150}, /* minor 8-11 */ 131 {0, 0, QIC_120} /* minor 12-15 */ 132 }}}, 133 {{T_SEQUENTIAL, T_REMOV, 134 "TANDBERG", " TDC 3800 ", ""}, {0, { 135 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 136 {0, 0, QIC_525}, /* minor 4-7 */ 137 {0, 0, QIC_150}, /* minor 8-11 */ 138 {0, 0, QIC_120} /* minor 12-15 */ 139 }}}, 140 /* 141 * At least -005 and -007 need this. I'll assume they all do unless I 142 * hear otherwise. - mycroft, 31MAR1994 143 */ 144 {{T_SEQUENTIAL, T_REMOV, 145 "ARCHIVE ", "VIPER 2525 25462", ""}, {0, { 146 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 147 {ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */ 148 {0, 0, QIC_150}, /* minor 8-11 */ 149 {0, 0, QIC_120} /* minor 12-15 */ 150 }}}, 151 /* 152 * One user reports that this works for his tape drive. It probably 153 * needs more work. - mycroft, 09APR1994 154 */ 155 {{T_SEQUENTIAL, T_REMOV, 156 "SANKYO ", "CP525 ", ""}, {0, { 157 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 158 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 159 {0, 0, QIC_150}, /* minor 8-11 */ 160 {0, 0, QIC_120} /* minor 12-15 */ 161 }}}, 162 {{T_SEQUENTIAL, T_REMOV, 163 "ANRITSU ", "DMT780 ", ""}, {0, { 164 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 165 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 166 {0, 0, QIC_150}, /* minor 8-11 */ 167 {0, 0, QIC_120} /* minor 12-15 */ 168 }}}, 169 {{T_SEQUENTIAL, T_REMOV, 170 "ARCHIVE ", "VIPER 150 21247", ""}, {0, { 171 {0, 0, 0}, /* minor 0-3 */ 172 {0, 0, QIC_150}, /* minor 4-7 */ 173 {0, 0, QIC_120}, /* minor 8-11 */ 174 {0, 0, QIC_24} /* minor 12-15 */ 175 }}}, 176 {{T_SEQUENTIAL, T_REMOV, 177 "ARCHIVE ", "VIPER 150 21531", ""}, {0, { 178 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 179 {0, 0, QIC_150}, /* minor 4-7 */ 180 {0, 0, QIC_120}, /* minor 8-11 */ 181 {0, 0, QIC_24} /* minor 12-15 */ 182 }}}, 183 {{T_SEQUENTIAL, T_REMOV, 184 "WANGTEK ", "5099ES SCSI", ""}, {0, { 185 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 186 {0, 0, QIC_11}, /* minor 4-7 */ 187 {0, 0, QIC_24}, /* minor 8-11 */ 188 {0, 0, QIC_24} /* minor 12-15 */ 189 }}}, 190 {{T_SEQUENTIAL, T_REMOV, 191 "WANGTEK ", "5150ES SCSI", ""}, {0, { 192 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 193 {0, 0, QIC_24}, /* minor 4-7 */ 194 {0, 0, QIC_120}, /* minor 8-11 */ 195 {0, 0, QIC_150} /* minor 12-15 */ 196 }}}, 197 {{T_SEQUENTIAL, T_REMOV, 198 "WANGTEK ", "5525ES SCSI REV7", ""}, {0, { 199 {0, 0, 0}, /* minor 0-3 */ 200 {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 201 {0, 0, QIC_150}, /* minor 8-11 */ 202 {0, 0, QIC_120} /* minor 12-15 */ 203 }}}, 204 {{T_SEQUENTIAL, T_REMOV, 205 "WangDAT ", "Model 1300 ", ""}, {0, { 206 {0, 0, 0}, /* minor 0-3 */ 207 {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */ 208 {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */ 209 {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */ 210 }}}, 211 {{T_SEQUENTIAL, T_REMOV, 212 "EXABYTE ", "EXB-8200 ", "263H"}, {0, { 213 {0, 0, 0}, /* minor 0-3 */ 214 {0, 0, 0}, /* minor 4-7 */ 215 {0, 0, 0}, /* minor 8-11 */ 216 {0, 0, 0} /* minor 12-15 */ 217 }}}, 218 {{T_SEQUENTIAL, T_REMOV, 219 "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, { 220 {0, 0, QIC_3095}, /* minor 0-3 */ 221 {0, 0, QIC_3095}, /* minor 4-7 */ 222 {0, 0, QIC_3095}, /* minor 8-11 */ 223 {0, 0, QIC_3095}, /* minor 12-15 */ 224 }}}, 225#if 0 226 {{T_SEQUENTIAL, T_REMOV, 227 "EXABYTE ", "EXB-8200 ", ""}, {0, { 228 {0, 0, 0}, /* minor 0-3 */ 229 {0, 0, 0}, /* minor 4-7 */ 230 {0, 0, 0}, /* minor 8-11 */ 231 {0, 0, 0} /* minor 12-15 */ 232 }}}, 233#endif 234 {{T_SEQUENTIAL, T_REMOV, 235 "WANGTEK ", "5150ES SCSI FA15\0""01 A", "????"}, {0, { 236 {0, ST_Q_IGNORE_LOADS, 0}, /* minor 0-3 */ 237 {0, 0, 0}, /* minor 4-7 */ 238 {0, 0, 0}, /* minor 8-11 */ 239 {0, 0, 0} /* minor 12-15 */ 240 }}}, 241 {{T_SEQUENTIAL, T_REMOV, 242 "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, { 243 {0, 0, 0}, /* minor 0-3 */ 244 {0, 0, 0}, /* minor 4-7 */ 245 {0, 0, 0}, /* minor 8-11 */ 246 {0, 0, 0} /* minor 12-15 */ 247 }}}, 248 249}; 250 251#define NOEJECT 0 252#define EJECT 1 253 254#define NOREWIND 0 255#define DOREWIND 1 256 257struct st_softc { 258 struct device sc_dev; 259/*--------------------present operating parameters, flags etc.----------------*/ 260 int flags; /* see below */ 261 u_int quirks; /* quirks for the open mode */ 262 int blksize; /* blksize we are using */ 263 u_int8_t density; /* present density */ 264 u_int last_dsty; /* last density opened */ 265 short mt_resid; /* last (short) resid */ 266 short mt_erreg; /* last error (sense key) seen */ 267/*--------------------device/scsi parameters----------------------------------*/ 268 struct scsi_link *sc_link; /* our link to the adpter etc. */ 269/*--------------------parameters reported by the device ----------------------*/ 270 int blkmin; /* min blk size */ 271 int blkmax; /* max blk size */ 272 const struct quirkdata *quirkdata; /* if we have a rogue entry */ 273/*--------------------parameters reported by the device for this media--------*/ 274 u_int64_t numblks; /* nominal blocks capacity */ 275 u_int32_t media_blksize; /* 0 if not ST_FIXEDBLOCKS */ 276 u_int32_t media_density; /* this is what it said when asked */ 277/*--------------------quirks for the whole drive------------------------------*/ 278 u_int drive_quirks; /* quirks of this drive */ 279/*--------------------How we should set up when opening each minor device----*/ 280 struct modes modes[4]; /* plus more for each mode */ 281 u_int8_t modeflags[4]; /* flags for the modes */ 282#define DENSITY_SET_BY_USER 0x01 283#define DENSITY_SET_BY_QUIRK 0x02 284#define BLKSIZE_SET_BY_USER 0x04 285#define BLKSIZE_SET_BY_QUIRK 0x08 286/*--------------------storage for sense data returned by the drive------------*/ 287 struct buf buf_queue; /* the queue of pending IO operations */ 288}; 289 290 291int stmatch(struct device *, void *, void *); 292void stattach(struct device *, struct device *, void *); 293void st_identify_drive(struct st_softc *, struct scsi_inquiry_data *); 294void st_loadquirks(struct st_softc *); 295int st_mount_tape(dev_t, int); 296void st_unmount(struct st_softc *, boolean, boolean); 297int st_decide_mode(struct st_softc *, boolean); 298void ststart(void *); 299int st_read(struct st_softc *, char *, int, int); 300int st_read_block_limits(struct st_softc *, int); 301int st_mode_sense(struct st_softc *, int); 302int st_mode_select(struct st_softc *, int); 303int st_space(struct st_softc *, daddr_t, u_int, int); 304int st_write_filemarks(struct st_softc *, daddr_t, int); 305int st_check_eod(struct st_softc *, boolean, int *, int); 306int st_load(struct st_softc *, u_int, int); 307int st_rewind(struct st_softc *, u_int, int); 308int st_interpret_sense(struct scsi_xfer *); 309int st_touch_tape(struct st_softc *); 310int st_erase(struct st_softc *, daddr_t, int); 311 312struct cfattach st_ca = { 313 sizeof(struct st_softc), stmatch, stattach 314}; 315 316struct cfdriver st_cd = { 317 NULL, "st", DV_TAPE 318}; 319 320struct scsi_device st_switch = { 321 st_interpret_sense, 322 ststart, 323 NULL, 324 NULL, 325}; 326 327#define ST_INFO_VALID 0x0001 328#define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 329#define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 330#define ST_FIXEDBLOCKS 0x0008 331#define ST_AT_FILEMARK 0x0010 332#define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 333#define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 334#define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 335#define ST_FM_WRITTEN 0x0100 /* 336 * EOF file mark written -- used with 337 * ~ST_WRITTEN to indicate that multiple file 338 * marks have been written 339 */ 340#define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 341#define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 342#define ST_MOUNTED 0x0800 /* Device is presently mounted */ 343#define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 344 345#define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 346#define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 347 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 348 ST_2FM_AT_EOD | ST_PER_ACTION) 349 350const struct scsi_inquiry_pattern st_patterns[] = { 351 {T_SEQUENTIAL, T_REMOV, 352 "", "", ""}, 353}; 354 355int 356stmatch(parent, match, aux) 357 struct device *parent; 358 void *match, *aux; 359{ 360 struct scsibus_attach_args *sa = aux; 361 int priority; 362 363 (void)scsi_inqmatch(sa->sa_inqbuf, 364 st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 365 sizeof(st_patterns[0]), &priority); 366 return (priority); 367} 368 369/* 370 * The routine called by the low level scsi routine when it discovers 371 * A device suitable for this driver 372 */ 373void 374stattach(parent, self, aux) 375 struct device *parent, *self; 376 void *aux; 377{ 378 struct st_softc *st = (void *)self; 379 struct scsibus_attach_args *sa = aux; 380 struct scsi_link *sc_link = sa->sa_sc_link; 381 382 SC_DEBUG(sc_link, SDEV_DB2, ("stattach:\n")); 383 384 /* 385 * Store information needed to contact our base driver 386 */ 387 st->sc_link = sc_link; 388 sc_link->device = &st_switch; 389 sc_link->device_softc = st; 390 391 /* 392 * Check if the drive is a known criminal and take 393 * Any steps needed to bring it into line 394 */ 395 st_identify_drive(st, sa->sa_inqbuf); 396 397 /* 398 * Use the subdriver to request information regarding 399 * the drive. We cannot use interrupts yet, so the 400 * request must specify this. 401 */ 402 printf("\n"); 403 printf("%s: %s", st->sc_dev.dv_xname, st->quirkdata ? "rogue, " : ""); 404 if (scsi_test_unit_ready(sc_link, TEST_READY_RETRIES_TAPE, 405 scsi_autoconf | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE) || 406 st_mode_sense(st, 407 scsi_autoconf | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE)) { 408 printf("drive empty or not ready\n"); 409 } 410 else { 411 printf("density code 0x%x, ", st->media_density); 412 if (st->media_blksize > 0) 413 printf("%d-byte", st->media_blksize); 414 else 415 printf("variable"); 416 printf(" blocks, write-%s\n", 417 (st->flags & ST_READONLY) ? "protected" : "enabled"); 418 } 419 420 /* 421 * Set up the buf queue for this device 422 */ 423 st->buf_queue.b_active = 0; 424 st->buf_queue.b_actf = 0; 425 st->buf_queue.b_actb = &st->buf_queue.b_actf; 426 427 /* 428 * Reset the media loaded flag, sometimes the data 429 * acquired at boot time is not quite accurate. This 430 * will be checked again at the first open. 431 */ 432 sc_link->flags &= ~SDEV_MEDIA_LOADED; 433} 434 435/* 436 * Use the inquiry routine in 'scsi_base' to get drive info so we can 437 * Further tailor our behaviour. 438 */ 439void 440st_identify_drive(st, inqbuf) 441 struct st_softc *st; 442 struct scsi_inquiry_data *inqbuf; 443{ 444 const struct st_quirk_inquiry_pattern *finger; 445 int priority; 446 447 finger = (const struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf, 448 st_quirk_patterns, 449 sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]), 450 sizeof(st_quirk_patterns[0]), &priority); 451 if (priority != 0) { 452 st->quirkdata = &finger->quirkdata; 453 st->drive_quirks = finger->quirkdata.quirks; 454 st->quirks = finger->quirkdata.quirks; /* start value */ 455 st_loadquirks(st); 456 } 457} 458 459/* 460 * initialise the subdevices to the default (QUIRK) state. 461 * this will remove any setting made by the system operator or previous 462 * operations. 463 */ 464void 465st_loadquirks(st) 466 struct st_softc *st; 467{ 468 int i; 469 const struct modes *mode; 470 struct modes *mode2; 471 472 mode = st->quirkdata->modes; 473 mode2 = st->modes; 474 for (i = 0; i < 4; i++) { 475 bzero(mode2, sizeof(struct modes)); 476 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 477 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 478 DENSITY_SET_BY_USER); 479 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 480 mode2->blksize = mode->blksize; 481 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 482 } 483 if (mode->density) { 484 mode2->density = mode->density; 485 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 486 } 487 mode++; 488 mode2++; 489 } 490} 491 492/* 493 * open the device. 494 */ 495int 496stopen(dev, flags, mode, p) 497 dev_t dev; 498 int flags; 499 int mode; 500 struct proc *p; 501{ 502 int unit; 503 u_int stmode, dsty; 504 int error = 0; 505 struct st_softc *st; 506 struct scsi_link *sc_link; 507 508 unit = STUNIT(dev); 509 if (unit >= st_cd.cd_ndevs) 510 return ENXIO; 511 st = st_cd.cd_devs[unit]; 512 if (!st) 513 return ENXIO; 514 515 stmode = STMODE(dev); 516 dsty = STDSTY(dev); 517 sc_link = st->sc_link; 518 519 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 520 unit, st_cd.cd_ndevs)); 521 522 /* 523 * Only allow one at a time 524 */ 525 if (sc_link->flags & SDEV_OPEN) { 526 SC_DEBUG(sc_link, SDEV_DB4, ("already open\n")); 527 return EBUSY; 528 } 529 530 /* 531 * Catch any unit attention errors. 532 */ 533 error = scsi_test_unit_ready(sc_link, TEST_READY_RETRIES_DEFAULT, 534 SCSI_IGNORE_MEDIA_CHANGE | 535 (stmode == CTLMODE ? SCSI_IGNORE_NOT_READY : 0)); 536 if (error) 537 goto bad; 538 539 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 540 541 /* 542 * If the mode is 3 (e.g. minor = 3,7,11,15) 543 * then the device has been opened to set defaults 544 * This mode does NOT ALLOW I/O, only ioctls 545 */ 546 if (stmode == CTLMODE) 547 return 0; 548 549 /* 550 * if it's a different mode, or if the media has been 551 * invalidated, unmount the tape from the previous 552 * session but continue with open processing 553 */ 554 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 555 st_unmount(st, NOEJECT, DOREWIND); 556 557 /* 558 * If we are not mounted, then we should start a new 559 * mount session. 560 */ 561 if (!(st->flags & ST_MOUNTED)) { 562 st_mount_tape(dev, flags); 563 st->last_dsty = dsty; 564 } 565 566 /* 567 * Make sure that a tape opened in write-only mode will have 568 * file marks written on it when closed, even if not written to. 569 * This is for SUN compatibility 570 */ 571 if ((flags & O_ACCMODE) == FWRITE) 572 st->flags |= ST_WRITTEN; 573 574 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 575 return 0; 576 577bad: 578 st_unmount(st, NOEJECT, DOREWIND); 579 sc_link->flags &= ~SDEV_OPEN; 580 return error; 581} 582 583/* 584 * close the device.. only called if we are the LAST 585 * occurence of an open device 586 */ 587int 588stclose(dev, flags, mode, p) 589 dev_t dev; 590 int flags; 591 int mode; 592 struct proc *p; 593{ 594 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 595 596 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 597 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 598 st_write_filemarks(st, 1, 0); 599 switch (STMODE(dev)) { 600 case 0: /* normal */ 601 st_unmount(st, NOEJECT, DOREWIND); 602 break; 603 case 3: /* eject, no rewind */ 604 st_unmount(st, EJECT, NOREWIND); 605 break; 606 case 1: /* no rewind */ 607 /* leave mounted unless media seems to have been removed */ 608 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) 609 st_unmount(st, NOEJECT, NOREWIND); 610 break; 611 case 2: /* rewind, eject */ 612 st_unmount(st, EJECT, DOREWIND); 613 break; 614 } 615 st->sc_link->flags &= ~SDEV_OPEN; 616 617 return 0; 618} 619 620/* 621 * Start a new mount session. 622 * Copy in all the default parameters from the selected device mode. 623 * and try guess any that seem to be defaulted. 624 */ 625int 626st_mount_tape(dev, flags) 627 dev_t dev; 628 int flags; 629{ 630 int unit; 631 u_int mode, dsty; 632 struct st_softc *st; 633 struct scsi_link *sc_link; 634 int error = 0; 635 636 unit = STUNIT(dev); 637 mode = STMODE(dev); 638 dsty = STDSTY(dev); 639 st = st_cd.cd_devs[unit]; 640 sc_link = st->sc_link; 641 642 if (st->flags & ST_MOUNTED) 643 return 0; 644 645 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n")); 646 st->flags |= ST_NEW_MOUNT; 647 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 648 /* 649 * If the media is new, then make sure we give it a chance to 650 * to do a 'load' instruction. (We assume it is new.) 651 */ 652 if ((error = st_load(st, LD_LOAD, 0)) != 0) 653 return error; 654 /* 655 * Throw another dummy instruction to catch 656 * 'Unit attention' errors. Some drives appear to give 657 * these after doing a Load instruction. 658 * (noteably some DAT drives) 659 */ 660 /* XXX */ 661 scsi_test_unit_ready(sc_link, TEST_READY_RETRIES_DEFAULT, SCSI_SILENT); 662 663 /* 664 * Some devices can't tell you much until they have been 665 * asked to look at the media. This quirk does this. 666 */ 667 if (st->quirks & ST_Q_SENSE_HELP) 668 if ((error = st_touch_tape(st)) != 0) 669 return error; 670 /* 671 * Load the physical device parameters 672 * loads: blkmin, blkmax 673 */ 674 if (!(sc_link->flags & SDEV_ATAPI) && 675 (error = st_read_block_limits(st, 0)) != 0) { 676 return error; 677 } 678 679 /* 680 * Load the media dependent parameters 681 * includes: media_blksize,media_density,numblks 682 * As we have a tape in, it should be reflected here. 683 * If not you may need the "quirk" above. 684 */ 685 if ((error = st_mode_sense(st, 0)) != 0) 686 return error; 687 688 /* 689 * If we have gained a permanent density from somewhere, 690 * then use it in preference to the one supplied by 691 * default by the driver. 692 */ 693 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 694 st->density = st->modes[dsty].density; 695 else 696 st->density = st->media_density; 697 /* 698 * If we have gained a permanent blocksize 699 * then use it in preference to the one supplied by 700 * default by the driver. 701 */ 702 st->flags &= ~ST_FIXEDBLOCKS; 703 if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 704 st->blksize = st->modes[dsty].blksize; 705 if (st->blksize) 706 st->flags |= ST_FIXEDBLOCKS; 707 } else { 708 if ((error = st_decide_mode(st, FALSE)) != 0) 709 return error; 710 } 711 if ((error = st_mode_select(st, 0)) != 0) { 712 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 713 return error; 714 } 715 scsi_prevent(sc_link, PR_PREVENT, 716 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 717 st->flags &= ~ST_NEW_MOUNT; 718 st->flags |= ST_MOUNTED; 719 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 720 721 return 0; 722} 723 724/* 725 * End the present mount session. 726 * Rewind, and optionally eject the tape. 727 * Reset various flags to indicate that all new 728 * operations require another mount operation 729 */ 730void 731st_unmount(st, eject, rewind) 732 struct st_softc *st; 733 boolean eject, rewind; 734{ 735 struct scsi_link *sc_link = st->sc_link; 736 int nmarks; 737 738 if (!(st->flags & ST_MOUNTED)) 739 return; 740 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 741 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 742 if (rewind) 743 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 744 scsi_prevent(sc_link, PR_ALLOW, 745 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 746 if (eject) 747 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 748 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 749 sc_link->flags &= ~SDEV_MEDIA_LOADED; 750} 751 752/* 753 * Given all we know about the device, media, mode, 'quirks' and 754 * initial operation, make a decision as to how we should be set 755 * to run (regarding blocking and EOD marks) 756 */ 757int 758st_decide_mode(st, first_read) 759 struct st_softc *st; 760 boolean first_read; 761{ 762 struct scsi_link *sc_link = st->sc_link; 763 764 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 765 766 /* ATAPI tapes are always fixed blocksize. */ 767 if (sc_link->flags & SDEV_ATAPI) { 768 st->flags |= ST_FIXEDBLOCKS; 769 if (st->media_blksize > 0) 770 st->blksize = st->media_blksize; 771 else 772 st->blksize = DEF_FIXED_BSIZE; 773 goto done; 774 } 775 776 /* 777 * If the drive can only handle fixed-length blocks and only at 778 * one size, perhaps we should just do that. 779 */ 780 if (st->blkmin && (st->blkmin == st->blkmax)) { 781 st->flags |= ST_FIXEDBLOCKS; 782 st->blksize = st->blkmin; 783 SC_DEBUG(sc_link, SDEV_DB3, 784 ("blkmin == blkmax of %d\n", st->blkmin)); 785 goto done; 786 } 787 /* 788 * If the tape density mandates (or even suggests) use of fixed 789 * or variable-length blocks, comply. 790 */ 791 switch (st->density) { 792 case HALFINCH_800: 793 case HALFINCH_1600: 794 case HALFINCH_6250: 795 case DDS: 796 st->flags &= ~ST_FIXEDBLOCKS; 797 st->blksize = 0; 798 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 799 goto done; 800 case QIC_11: 801 case QIC_24: 802 case QIC_120: 803 case QIC_150: 804 case QIC_525: 805 case QIC_1320: 806 st->flags |= ST_FIXEDBLOCKS; 807 if (st->media_blksize > 0) 808 st->blksize = st->media_blksize; 809 else 810 st->blksize = DEF_FIXED_BSIZE; 811 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 812 goto done; 813 } 814 /* 815 * If we're about to read the tape, perhaps we should choose 816 * fixed or variable-length blocks and block size according to 817 * what the drive found on the tape. 818 */ 819 if (first_read && 820 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 821 (st->media_blksize == DEF_FIXED_BSIZE) || 822 (st->media_blksize == 1024))) { 823 if (st->media_blksize > 0) 824 st->flags |= ST_FIXEDBLOCKS; 825 else 826 st->flags &= ~ST_FIXEDBLOCKS; 827 st->blksize = st->media_blksize; 828 SC_DEBUG(sc_link, SDEV_DB3, 829 ("Used media_blksize of %d\n", st->media_blksize)); 830 goto done; 831 } 832 /* 833 * We're getting no hints from any direction. Choose variable- 834 * length blocks arbitrarily. 835 */ 836 st->flags &= ~ST_FIXEDBLOCKS; 837 st->blksize = 0; 838 SC_DEBUG(sc_link, SDEV_DB3, 839 ("Give up and default to variable mode\n")); 840 841done: 842 /* 843 * Decide whether or not to write two file marks to signify end- 844 * of-data. Make the decision as a function of density. If 845 * the decision is not to use a second file mark, the SCSI BLANK 846 * CHECK condition code will be recognized as end-of-data when 847 * first read. 848 * (I think this should be a by-product of fixed/variable..julian) 849 */ 850 switch (st->density) { 851/* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 852 case QIC_11: 853 case QIC_24: 854 case QIC_120: 855 case QIC_150: 856 case QIC_525: 857 case QIC_1320: 858 st->flags &= ~ST_2FM_AT_EOD; 859 break; 860 default: 861 st->flags |= ST_2FM_AT_EOD; 862 } 863 return 0; 864} 865 866/* 867 * Actually translate the requested transfer into 868 * one the physical driver can understand 869 * The transfer is described by a buf and will include 870 * only one physical transfer. 871 */ 872void 873ststrategy(bp) 874 struct buf *bp; 875{ 876 struct st_softc *st = st_cd.cd_devs[STUNIT(bp->b_dev)]; 877 struct buf *dp; 878 int s; 879 880 SC_DEBUG(st->sc_link, SDEV_DB2, ("ststrategy: %ld bytes @ blk %d\n", 881 bp->b_bcount, bp->b_blkno)); 882 /* 883 * If it's a null transfer, return immediately. 884 */ 885 if (bp->b_bcount == 0) 886 goto done; 887 /* 888 * Odd sized request on fixed drives are verboten 889 */ 890 if (st->flags & ST_FIXEDBLOCKS) { 891 if (bp->b_bcount % st->blksize) { 892 printf("%s: bad request, must be multiple of %d\n", 893 st->sc_dev.dv_xname, st->blksize); 894 bp->b_error = EIO; 895 goto bad; 896 } 897 } 898 /* 899 * as are out-of-range requests on variable drives. 900 */ 901 else if (bp->b_bcount < st->blkmin || 902 (st->blkmax && bp->b_bcount > st->blkmax)) { 903 printf("%s: bad request, must be between %d and %d\n", 904 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 905 bp->b_error = EIO; 906 goto bad; 907 } 908 s = splbio(); 909 910 /* 911 * Place it in the queue of activities for this tape 912 * at the end (a bit silly because we only have on user.. 913 * (but it could fork())) 914 */ 915 dp = &st->buf_queue; 916 bp->b_actf = NULL; 917 bp->b_actb = dp->b_actb; 918 *dp->b_actb = bp; 919 dp->b_actb = &bp->b_actf; 920 921 /* 922 * Tell the device to get going on the transfer if it's 923 * not doing anything, otherwise just wait for completion 924 * (All a bit silly if we're only allowing 1 open but..) 925 */ 926 ststart(st); 927 928 splx(s); 929 return; 930bad: 931 bp->b_flags |= B_ERROR; 932done: 933 /* 934 * Correctly set the buf to indicate a completed xfer 935 */ 936 bp->b_resid = bp->b_bcount; 937 s = splbio(); 938 biodone(bp); 939 splx(s); 940} 941 942/* 943 * ststart looks to see if there is a buf waiting for the device 944 * and that the device is not already busy. If both are true, 945 * It dequeues the buf and creates a scsi command to perform the 946 * transfer required. The transfer request will call scsi_done 947 * on completion, which will in turn call this routine again 948 * so that the next queued transfer is performed. 949 * The bufs are queued by the strategy routine (ststrategy) 950 * 951 * This routine is also called after other non-queued requests 952 * have been made of the scsi driver, to ensure that the queue 953 * continues to be drained. 954 * ststart() is called at splbio 955 */ 956void 957ststart(v) 958 void *v; 959{ 960 struct st_softc *st = v; 961 struct scsi_link *sc_link = st->sc_link; 962 struct buf *bp, *dp; 963 struct scsi_rw_tape cmd; 964 int flags; 965 966 SC_DEBUG(sc_link, SDEV_DB2, ("ststart\n")); 967 968 splassert(IPL_BIO); 969 970 /* 971 * See if there is a buf to do and we are not already 972 * doing one 973 */ 974 while (sc_link->openings > 0) { 975 /* if a special awaits, let it proceed first */ 976 if (sc_link->flags & SDEV_WAITING) { 977 sc_link->flags &= ~SDEV_WAITING; 978 wakeup((caddr_t)sc_link); 979 return; 980 } 981 982 dp = &st->buf_queue; 983 if ((bp = dp->b_actf) == NULL) 984 return; 985 if ((dp = bp->b_actf) != NULL) 986 dp->b_actb = bp->b_actb; 987 else 988 st->buf_queue.b_actb = bp->b_actb; 989 *bp->b_actb = dp; 990 991 /* 992 * if the device has been unmounted by the user 993 * then throw away all requests until done 994 */ 995 if (!(st->flags & ST_MOUNTED) || 996 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 997 /* make sure that one implies the other.. */ 998 sc_link->flags &= ~SDEV_MEDIA_LOADED; 999 bp->b_flags |= B_ERROR; 1000 bp->b_resid = bp->b_bcount; 1001 bp->b_error = EIO; 1002 biodone(bp); 1003 continue; 1004 } 1005 /* 1006 * only FIXEDBLOCK devices have pending operations 1007 */ 1008 if (st->flags & ST_FIXEDBLOCKS) { 1009 /* 1010 * If we are at a filemark but have not reported it yet 1011 * then we should report it now 1012 */ 1013 if (st->flags & ST_AT_FILEMARK) { 1014 if ((bp->b_flags & B_READ) == B_WRITE) { 1015 /* 1016 * Handling of ST_AT_FILEMARK in 1017 * st_space will fill in the right file 1018 * mark count. 1019 * Back up over filemark 1020 */ 1021 if (st_space(st, 0, SP_FILEMARKS, 0)) { 1022 bp->b_flags |= B_ERROR; 1023 bp->b_resid = bp->b_bcount; 1024 bp->b_error = EIO; 1025 biodone(bp); 1026 continue; 1027 } 1028 } else { 1029 bp->b_resid = bp->b_bcount; 1030 bp->b_error = 0; 1031 bp->b_flags &= ~B_ERROR; 1032 st->flags &= ~ST_AT_FILEMARK; 1033 biodone(bp); 1034 continue; /* seek more work */ 1035 } 1036 } 1037 /* 1038 * If we are at EIO (e.g. EOM) but have not reported it 1039 * yet then we should report it now 1040 */ 1041 if (st->flags & ST_EIO_PENDING) { 1042 bp->b_resid = bp->b_bcount; 1043 bp->b_error = EIO; 1044 bp->b_flags |= B_ERROR; 1045 st->flags &= ~ST_EIO_PENDING; 1046 biodone(bp); 1047 continue; /* seek more work */ 1048 } 1049 } 1050 1051 /* 1052 * Fill out the scsi command 1053 */ 1054 bzero(&cmd, sizeof(cmd)); 1055 if ((bp->b_flags & B_READ) == B_WRITE) { 1056 cmd.opcode = WRITE; 1057 st->flags &= ~ST_FM_WRITTEN; 1058 st->flags |= ST_WRITTEN; 1059 flags = SCSI_DATA_OUT; 1060 } else { 1061 cmd.opcode = READ; 1062 flags = SCSI_DATA_IN; 1063 } 1064 1065 /* 1066 * Handle "fixed-block-mode" tape drives by using the 1067 * block count instead of the length. 1068 */ 1069 if (st->flags & ST_FIXEDBLOCKS) { 1070 cmd.byte2 |= SRW_FIXED; 1071 _lto3b(bp->b_bcount / st->blksize, cmd.len); 1072 } else 1073 _lto3b(bp->b_bcount, cmd.len); 1074 1075 /* 1076 * go ask the adapter to do all this for us 1077 */ 1078 if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1079 sizeof(cmd), (u_char *) bp->b_data, bp->b_bcount, 0, 1080 ST_IO_TIME, bp, flags | SCSI_NOSLEEP)) 1081 printf("%s: not queued\n", st->sc_dev.dv_xname); 1082 } /* go back and see if we can cram more work in.. */ 1083} 1084 1085int 1086stread(dev, uio, iomode) 1087 dev_t dev; 1088 struct uio *uio; 1089 int iomode; 1090{ 1091 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1092 1093 return (physio(ststrategy, NULL, dev, B_READ, 1094 st->sc_link->adapter->scsi_minphys, uio)); 1095} 1096 1097int 1098stwrite(dev, uio, iomode) 1099 dev_t dev; 1100 struct uio *uio; 1101 int iomode; 1102{ 1103 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1104 1105 return (physio(ststrategy, NULL, dev, B_WRITE, 1106 st->sc_link->adapter->scsi_minphys, uio)); 1107} 1108 1109/* 1110 * Perform special action on behalf of the user; 1111 * knows about the internals of this device 1112 */ 1113int 1114stioctl(dev, cmd, arg, flag, p) 1115 dev_t dev; 1116 u_long cmd; 1117 caddr_t arg; 1118 int flag; 1119 struct proc *p; 1120{ 1121 int error = 0; 1122 int unit; 1123 int nmarks, dsty; 1124 int flags; 1125 struct st_softc *st; 1126 int hold_blksize; 1127 u_int8_t hold_density; 1128 struct mtop *mt = (struct mtop *) arg; 1129 daddr_t number; 1130 1131 /* 1132 * Find the device that the user is talking about 1133 */ 1134 flags = 0; /* give error messages, act on errors etc. */ 1135 unit = STUNIT(dev); 1136 dsty = STDSTY(dev); 1137 st = st_cd.cd_devs[unit]; 1138 hold_blksize = st->blksize; 1139 hold_density = st->density; 1140 1141 switch (cmd) { 1142 1143 case MTIOCGET: { 1144 struct mtget *g = (struct mtget *) arg; 1145 1146 /* 1147 * (to get the current state of READONLY) 1148 */ 1149 error = st_mode_sense(st, SCSI_SILENT); 1150 if (error) 1151 break; 1152 1153 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1154 bzero(g, sizeof(struct mtget)); 1155 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1156 g->mt_blksiz = st->blksize; 1157 g->mt_density = st->density; 1158 g->mt_mblksiz[0] = st->modes[0].blksize; 1159 g->mt_mblksiz[1] = st->modes[1].blksize; 1160 g->mt_mblksiz[2] = st->modes[2].blksize; 1161 g->mt_mblksiz[3] = st->modes[3].blksize; 1162 g->mt_mdensity[0] = st->modes[0].density; 1163 g->mt_mdensity[1] = st->modes[1].density; 1164 g->mt_mdensity[2] = st->modes[2].density; 1165 g->mt_mdensity[3] = st->modes[3].density; 1166 if (st->flags & ST_READONLY) 1167 g->mt_dsreg |= MT_DS_RDONLY; 1168 if (st->flags & ST_MOUNTED) 1169 g->mt_dsreg |= MT_DS_MOUNTED; 1170 g->mt_resid = st->mt_resid; 1171 g->mt_erreg = st->mt_erreg; 1172 /* 1173 * clear latched errors. 1174 */ 1175 st->mt_resid = 0; 1176 st->mt_erreg = 0; 1177 break; 1178 } 1179 case MTIOCTOP: { 1180 1181 SC_DEBUG(st->sc_link, SDEV_DB1, 1182 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); 1183 1184 number = mt->mt_count; 1185 switch (mt->mt_op) { 1186 case MTWEOF: /* write an end-of-file record */ 1187 error = st_write_filemarks(st, number, flags); 1188 break; 1189 case MTBSF: /* backward space file */ 1190 number = -number; 1191 case MTFSF: /* forward space file */ 1192 error = st_check_eod(st, FALSE, &nmarks, flags); 1193 if (!error) 1194 error = st_space(st, number - nmarks, 1195 SP_FILEMARKS, flags); 1196 break; 1197 case MTBSR: /* backward space record */ 1198 number = -number; 1199 case MTFSR: /* forward space record */ 1200 error = st_check_eod(st, TRUE, &nmarks, flags); 1201 if (!error) 1202 error = st_space(st, number, SP_BLKS, flags); 1203 break; 1204 case MTREW: /* rewind */ 1205 error = st_rewind(st, 0, flags); 1206 break; 1207 case MTOFFL: /* rewind and put the drive offline */ 1208 st_unmount(st, EJECT, DOREWIND); 1209 break; 1210 case MTNOP: /* no operation, sets status only */ 1211 break; 1212 case MTRETEN: /* retension the tape */ 1213 error = st_load(st, LD_RETENSION, flags); 1214 if (!error) 1215 error = st_load(st, LD_LOAD, flags); 1216 break; 1217 case MTEOM: /* forward space to end of media */ 1218 error = st_check_eod(st, FALSE, &nmarks, flags); 1219 if (!error) 1220 error = st_space(st, 1, SP_EOM, flags); 1221 break; 1222 case MTCACHE: /* enable controller cache */ 1223 st->flags &= ~ST_DONTBUFFER; 1224 goto try_new_value; 1225 case MTNOCACHE: /* disable controller cache */ 1226 st->flags |= ST_DONTBUFFER; 1227 goto try_new_value; 1228 case MTERASE: /* erase volume */ 1229 error = st_erase(st, number, flags); 1230 break; 1231 case MTSETBSIZ: /* Set block size for device */ 1232#ifdef NOTYET 1233 if (!(st->flags & ST_NEW_MOUNT)) { 1234 uprintf("re-mount tape before changing blocksize"); 1235 error = EINVAL; 1236 break; 1237 } 1238#endif 1239 if (number == 0) { 1240 st->flags &= ~ST_FIXEDBLOCKS; 1241 } else { 1242 if ((st->blkmin || st->blkmax) && 1243 (number < st->blkmin || 1244 number > st->blkmax)) { 1245 error = EINVAL; 1246 break; 1247 } 1248 st->flags |= ST_FIXEDBLOCKS; 1249 } 1250 st->blksize = number; 1251 st->flags |= ST_BLOCK_SET; /*XXX */ 1252 goto try_new_value; 1253 1254 case MTSETDNSTY: /* Set density for device and mode */ 1255 if (number < 0 || number > SCSI_MAX_DENSITY_CODE) { 1256 error = EINVAL; 1257 break; 1258 } else 1259 st->density = number; 1260 goto try_new_value; 1261 1262 default: 1263 error = EINVAL; 1264 } 1265 break; 1266 } 1267 case MTIOCIEOT: 1268 case MTIOCEEOT: 1269 break; 1270 1271#if 0 1272 case MTIOCRDSPOS: 1273 error = st_rdpos(st, 0, (u_int32_t *) arg); 1274 break; 1275 1276 case MTIOCRDHPOS: 1277 error = st_rdpos(st, 1, (u_int32_t *) arg); 1278 break; 1279 1280 case MTIOCSLOCATE: 1281 error = st_setpos(st, 0, (u_int32_t *) arg); 1282 break; 1283 1284 case MTIOCHLOCATE: 1285 error = st_setpos(st, 1, (u_int32_t *) arg); 1286 break; 1287#endif 1288 1289 default: 1290 if (STMODE(dev) == CTLMODE) 1291 error = scsi_do_ioctl(st->sc_link, dev, 1292 cmd, arg, flag, p); 1293 else 1294 error = ENOTTY; 1295 break; 1296 } 1297 return error; 1298/*-----------------------------*/ 1299try_new_value: 1300 /* 1301 * Check that the mode being asked for is aggreeable to the 1302 * drive. If not, put it back the way it was. 1303 */ 1304 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */ 1305 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1306 st->density = hold_density; 1307 st->blksize = hold_blksize; 1308 if (st->blksize) 1309 st->flags |= ST_FIXEDBLOCKS; 1310 else 1311 st->flags &= ~ST_FIXEDBLOCKS; 1312 return error; 1313 } 1314 /* 1315 * As the drive liked it, if we are setting a new default, 1316 * set it into the structures as such. 1317 * 1318 * The means for deciding this are not finalised yet 1319 */ 1320 if (STMODE(dev) == 0x03) { 1321 /* special mode */ 1322 /* XXX */ 1323 switch ((short) (mt->mt_op)) { 1324 case MTSETBSIZ: 1325 st->modes[dsty].blksize = st->blksize; 1326 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1327 break; 1328 case MTSETDNSTY: 1329 st->modes[dsty].density = st->density; 1330 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1331 break; 1332 } 1333 } 1334 return 0; 1335} 1336 1337/* 1338 * Do a synchronous read. 1339 */ 1340int 1341st_read(st, buf, size, flags) 1342 struct st_softc *st; 1343 int size; 1344 int flags; 1345 char *buf; 1346{ 1347 struct scsi_rw_tape cmd; 1348 1349 /* 1350 * If it's a null transfer, return immediatly 1351 */ 1352 if (size == 0) 1353 return 0; 1354 bzero(&cmd, sizeof(cmd)); 1355 cmd.opcode = READ; 1356 if (st->flags & ST_FIXEDBLOCKS) { 1357 cmd.byte2 |= SRW_FIXED; 1358 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1359 cmd.len); 1360 } else 1361 _lto3b(size, cmd.len); 1362 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1363 sizeof(cmd), (u_char *) buf, size, 0, ST_IO_TIME, NULL, 1364 flags | SCSI_DATA_IN); 1365} 1366 1367/* 1368 * Ask the drive what it's min and max blk sizes are. 1369 */ 1370int 1371st_read_block_limits(st, flags) 1372 struct st_softc *st; 1373 int flags; 1374{ 1375 struct scsi_block_limits cmd; 1376 struct scsi_block_limits_data block_limits; 1377 struct scsi_link *sc_link = st->sc_link; 1378 int error; 1379 1380 /* 1381 * First check if we have it all loaded 1382 */ 1383 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1384 return 0; 1385 1386 /* 1387 * do a 'Read Block Limits' 1388 */ 1389 bzero(&cmd, sizeof(cmd)); 1390 cmd.opcode = READ_BLOCK_LIMITS; 1391 1392 /* 1393 * do the command, update the global values 1394 */ 1395 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1396 sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), 1397 ST_RETRIES, ST_CTL_TIME, NULL, flags | SCSI_DATA_IN); 1398 if (error) 1399 return error; 1400 1401 st->blkmin = _2btol(block_limits.min_length); 1402 st->blkmax = _3btol(block_limits.max_length); 1403 1404 SC_DEBUG(sc_link, SDEV_DB3, 1405 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1406 return 0; 1407} 1408 1409/* 1410 * Get the scsi driver to send a full inquiry to the 1411 * device and use the results to fill out the global 1412 * parameter structure. 1413 * 1414 * called from: 1415 * attach 1416 * open 1417 * ioctl (to reset original blksize) 1418 */ 1419int 1420st_mode_sense(st, flags) 1421 struct st_softc *st; 1422 int flags; 1423{ 1424 union scsi_mode_sense_buf *data; 1425 struct scsi_link *sc_link = st->sc_link; 1426 u_int64_t block_count; 1427 u_int32_t density, block_size; 1428 u_char *page0 = NULL; 1429 u_int8_t dev_spec; 1430 int error, big; 1431 1432 data = malloc(sizeof(*data), M_TEMP, M_NOWAIT); 1433 if (data == NULL) 1434 return (ENOMEM); 1435 1436 /* 1437 * Ask for page 0 (vendor specific) mode sense data. 1438 */ 1439 error = scsi_do_mode_sense(sc_link, 0, data, (void **)&page0, 1440 &density, &block_count, &block_size, 1, flags | SCSI_SILENT, &big); 1441 if (error != 0) { 1442 free(data, M_TEMP); 1443 return (error); 1444 } 1445 1446 /* It is valid for no page0 to be available. */ 1447 1448 if (big) 1449 dev_spec = data->hdr_big.dev_spec; 1450 else 1451 dev_spec = data->hdr.dev_spec; 1452 1453 if (dev_spec & SMH_DSP_WRITE_PROT) 1454 st->flags |= ST_READONLY; 1455 else 1456 st->flags &= ~ST_READONLY; 1457 1458 st->numblks = block_count; 1459 st->media_blksize = block_size; 1460 st->media_density = density; 1461 1462 SC_DEBUG(sc_link, SDEV_DB3, 1463 ("density code 0x%x, %d-byte blocks, write-%s, ", 1464 st->media_density, st->media_blksize, 1465 st->flags & ST_READONLY ? "protected" : "enabled")); 1466 SC_DEBUGN(sc_link, SDEV_DB3, 1467 ("%sbuffered\n", dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1468 1469 sc_link->flags |= SDEV_MEDIA_LOADED; 1470 1471 free(data, M_TEMP); 1472 return (0); 1473} 1474 1475/* 1476 * Send a filled out parameter structure to the drive to 1477 * set it into the desire modes etc. 1478 */ 1479int 1480st_mode_select(st, flags) 1481 struct st_softc *st; 1482 int flags; 1483{ 1484 union scsi_mode_sense_buf *inbuf, *outbuf; 1485 struct scsi_blk_desc general; 1486 struct scsi_link *sc_link = st->sc_link; 1487 u_int8_t *page0 = NULL; 1488 int error, big, page0_size; 1489 1490 inbuf = malloc(sizeof(*inbuf), M_TEMP, M_NOWAIT); 1491 if (inbuf == NULL) 1492 return (ENOMEM); 1493 outbuf = malloc(sizeof(*outbuf), M_TEMP, M_NOWAIT); 1494 if (outbuf == NULL) { 1495 free(inbuf, M_TEMP); 1496 return (ENOMEM); 1497 } 1498 1499 /* 1500 * This quirk deals with drives that have only one valid mode and think 1501 * this gives them license to reject all mode selects, even if the 1502 * selected mode is the one that is supported. 1503 */ 1504 if (st->quirks & ST_Q_UNIMODAL) { 1505 SC_DEBUG(sc_link, SDEV_DB3, 1506 ("not setting density 0x%x blksize 0x%x\n", 1507 st->density, st->blksize)); 1508 free(inbuf, M_TEMP); 1509 free(outbuf, M_TEMP); 1510 return (0); 1511 } 1512 1513 if (sc_link->flags & SDEV_ATAPI) { 1514 free(inbuf, M_TEMP); 1515 free(outbuf, M_TEMP); 1516 return (0); 1517 } 1518 1519 bzero(outbuf, sizeof(*outbuf)); 1520 bzero(&general, sizeof(general)); 1521 1522 general.density = st->density; 1523 if (st->flags & ST_FIXEDBLOCKS) 1524 _lto3b(st->blksize, general.blklen); 1525 1526 /* 1527 * Ask for page 0 (vendor specific) mode sense data. 1528 */ 1529 error = scsi_do_mode_sense(sc_link, 0, inbuf, (void **)&page0, NULL, 1530 NULL, NULL, 1, flags | SCSI_SILENT, &big); 1531 if (error != 0) { 1532 free(inbuf, M_TEMP); 1533 free(outbuf, M_TEMP); 1534 return (error); 1535 } 1536 1537 if (page0 == NULL) { 1538 page0_size = 0; 1539 } else if (big == 0) { 1540 page0_size = inbuf->hdr.data_length + 1541 sizeof(inbuf->hdr.data_length) - sizeof(inbuf->hdr) - 1542 inbuf->hdr.blk_desc_len; 1543 memcpy(&outbuf->buf[sizeof(outbuf->hdr)+ sizeof(general)], 1544 page0, page0_size); 1545 } else { 1546 page0_size = _2btol(inbuf->hdr_big.data_length) + 1547 sizeof(inbuf->hdr_big.data_length) - 1548 sizeof(inbuf->hdr_big) - 1549 _2btol(inbuf->hdr_big.blk_desc_len); 1550 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big) + sizeof(general)], 1551 page0, page0_size); 1552 } 1553 1554 /* 1555 * Set up for a mode select. 1556 */ 1557 if (big == 0) { 1558 outbuf->hdr.data_length = sizeof(outbuf->hdr) + 1559 sizeof(general) + page0_size - 1560 sizeof(outbuf->hdr.data_length); 1561 if ((st->flags & ST_DONTBUFFER) == 0) 1562 outbuf->hdr.dev_spec = SMH_DSP_BUFF_MODE_ON; 1563 outbuf->hdr.blk_desc_len = sizeof(general); 1564 memcpy(&outbuf->buf[sizeof(outbuf->hdr)], 1565 &general, sizeof(general)); 1566 error = scsi_mode_select(st->sc_link, 0, &outbuf->hdr, 1567 flags, ST_CTL_TIME); 1568 free(inbuf, M_TEMP); 1569 free(outbuf, M_TEMP); 1570 return (error); 1571 } 1572 1573 /* MODE SENSE (10) header was returned, so use MODE SELECT (10). */ 1574 _lto2b((sizeof(outbuf->hdr_big) + sizeof(general) + page0_size - 1575 sizeof(outbuf->hdr_big.data_length)), outbuf->hdr_big.data_length); 1576 if ((st->flags & ST_DONTBUFFER) == 0) 1577 outbuf->hdr_big.dev_spec = SMH_DSP_BUFF_MODE_ON; 1578 _lto2b(sizeof(general), outbuf->hdr_big.blk_desc_len); 1579 memcpy(&outbuf->buf[sizeof(outbuf->hdr_big)], &general, 1580 sizeof(general)); 1581 1582 error = scsi_mode_select_big(st->sc_link, 0, &outbuf->hdr_big, 1583 flags, ST_CTL_TIME); 1584 free(inbuf, M_TEMP); 1585 free(outbuf, M_TEMP); 1586 return (error); 1587} 1588 1589/* 1590 * issue an erase command 1591 */ 1592int 1593st_erase(st, full, flags) 1594 struct st_softc *st; 1595 daddr_t full; 1596 int flags; 1597{ 1598 struct scsi_erase cmd; 1599 int tmo; 1600 1601 /* 1602 * Full erase means set LONG bit in erase command, which asks 1603 * the drive to erase the entire unit. Without this bit, we're 1604 * asking the drive to write an erase gap. 1605 */ 1606 bzero(&cmd, sizeof(cmd)); 1607 cmd.opcode = ERASE; 1608 if (full) { 1609 cmd.byte2 = SE_IMMED|SE_LONG; 1610 tmo = ST_SPC_TIME; 1611 } else { 1612 cmd.byte2 = SE_IMMED; 1613 tmo = ST_IO_TIME; 1614 } 1615 1616 /* 1617 * XXX We always do this asynchronously, for now. How long should 1618 * we wait if we want to (eventually) to it synchronously? 1619 */ 1620 return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *)&cmd, 1621 sizeof(cmd), 0, 0, ST_RETRIES, tmo, NULL, flags)); 1622} 1623 1624/* 1625 * skip N blocks/filemarks/seq filemarks/eom 1626 */ 1627int 1628st_space(st, number, what, flags) 1629 struct st_softc *st; 1630 u_int what; 1631 int flags; 1632 daddr_t number; 1633{ 1634 struct scsi_space cmd; 1635 int error; 1636 1637 switch (what) { 1638 case SP_BLKS: 1639 if (st->flags & ST_PER_ACTION) { 1640 if (number > 0) { 1641 st->flags &= ~ST_PER_ACTION; 1642 return EIO; 1643 } else if (number < 0) { 1644 if (st->flags & ST_AT_FILEMARK) { 1645 /* 1646 * Handling of ST_AT_FILEMARK 1647 * in st_space will fill in the 1648 * right file mark count. 1649 */ 1650 error = st_space(st, 0, SP_FILEMARKS, 1651 flags); 1652 if (error) 1653 return error; 1654 } 1655 if (st->flags & ST_BLANK_READ) { 1656 st->flags &= ~ST_BLANK_READ; 1657 return EIO; 1658 } 1659 st->flags &= ~ST_EIO_PENDING; 1660 } 1661 } 1662 break; 1663 case SP_FILEMARKS: 1664 if (st->flags & ST_EIO_PENDING) { 1665 if (number > 0) { 1666 /* pretend we just discovered the error */ 1667 st->flags &= ~ST_EIO_PENDING; 1668 return EIO; 1669 } else if (number < 0) { 1670 /* back away from the error */ 1671 st->flags &= ~ST_EIO_PENDING; 1672 } 1673 } 1674 if (st->flags & ST_AT_FILEMARK) { 1675 st->flags &= ~ST_AT_FILEMARK; 1676 number--; 1677 } 1678 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1679 /* back away from unwritten tape */ 1680 st->flags &= ~ST_BLANK_READ; 1681 number++; /* XXX dubious */ 1682 } 1683 break; 1684 case SP_EOM: 1685 if (st->flags & ST_EIO_PENDING) { 1686 /* pretend we just discovered the error */ 1687 st->flags &= ~ST_EIO_PENDING; 1688 return EIO; 1689 } 1690 if (st->flags & ST_AT_FILEMARK) 1691 st->flags &= ~ST_AT_FILEMARK; 1692 break; 1693 } 1694 if (number == 0) 1695 return 0; 1696 1697 bzero(&cmd, sizeof(cmd)); 1698 cmd.opcode = SPACE; 1699 cmd.byte2 = what; 1700 _lto3b(number, cmd.number); 1701 1702 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1703 sizeof(cmd), 0, 0, 0, ST_SPC_TIME, NULL, flags); 1704} 1705 1706/* 1707 * write N filemarks 1708 */ 1709int 1710st_write_filemarks(st, number, flags) 1711 struct st_softc *st; 1712 int flags; 1713 daddr_t number; 1714{ 1715 struct scsi_write_filemarks cmd; 1716 1717 /* 1718 * It's hard to write a negative number of file marks. 1719 * Don't try. 1720 */ 1721 if (number < 0) 1722 return EINVAL; 1723 switch (number) { 1724 case 0: /* really a command to sync the drive's buffers */ 1725 break; 1726 case 1: 1727 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1728 st->flags &= ~ST_WRITTEN; 1729 else 1730 st->flags |= ST_FM_WRITTEN; 1731 st->flags &= ~ST_PER_ACTION; 1732 break; 1733 default: 1734 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1735 } 1736 1737 bzero(&cmd, sizeof(cmd)); 1738 cmd.opcode = WRITE_FILEMARKS; 1739 _lto3b(number, cmd.number); 1740 1741 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1742 sizeof(cmd), 0, 0, 0, ST_IO_TIME * 4, NULL, flags); 1743} 1744 1745/* 1746 * Make sure the right number of file marks is on tape if the 1747 * tape has been written. If the position argument is true, 1748 * leave the tape positioned where it was originally. 1749 * 1750 * nmarks returns the number of marks to skip (or, if position 1751 * true, which were skipped) to get back original position. 1752 */ 1753int 1754st_check_eod(st, position, nmarks, flags) 1755 struct st_softc *st; 1756 boolean position; 1757 int *nmarks; 1758 int flags; 1759{ 1760 int error; 1761 1762 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1763 default: 1764 *nmarks = 0; 1765 return 0; 1766 case ST_WRITTEN: 1767 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1768 *nmarks = 1; 1769 break; 1770 case ST_WRITTEN | ST_2FM_AT_EOD: 1771 *nmarks = 2; 1772 } 1773 error = st_write_filemarks(st, *nmarks, flags); 1774 if (position && !error) 1775 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1776 return error; 1777} 1778 1779/* 1780 * load/unload/retension 1781 */ 1782int 1783st_load(st, type, flags) 1784 struct st_softc *st; 1785 u_int type; 1786 int flags; 1787{ 1788 struct scsi_load cmd; 1789 1790 if (type != LD_LOAD) { 1791 int error; 1792 int nmarks; 1793 1794 error = st_check_eod(st, FALSE, &nmarks, flags); 1795 if (error) 1796 return error; 1797 } 1798 if (st->quirks & ST_Q_IGNORE_LOADS) { 1799 if (type == LD_LOAD) { 1800 /* 1801 * If we ignore loads, at least we should try a rewind. 1802 */ 1803 return st_rewind(st, 0, flags); 1804 } 1805 return (0); 1806 } 1807 1808 1809 bzero(&cmd, sizeof(cmd)); 1810 cmd.opcode = LOAD; 1811 cmd.how = type; 1812 1813 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1814 sizeof(cmd), 0, 0, ST_RETRIES, ST_SPC_TIME, NULL, flags); 1815} 1816 1817/* 1818 * Rewind the device 1819 */ 1820int 1821st_rewind(st, immediate, flags) 1822 struct st_softc *st; 1823 u_int immediate; 1824 int flags; 1825{ 1826 struct scsi_rewind cmd; 1827 int error; 1828 int nmarks; 1829 1830 error = st_check_eod(st, FALSE, &nmarks, flags); 1831 if (error) 1832 return error; 1833 st->flags &= ~ST_PER_ACTION; 1834 1835 bzero(&cmd, sizeof(cmd)); 1836 cmd.opcode = REWIND; 1837 cmd.byte2 = immediate; 1838 1839 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1840 sizeof(cmd), 0, 0, ST_RETRIES, 1841 immediate ? ST_CTL_TIME: ST_SPC_TIME, NULL, flags); 1842} 1843 1844/* 1845 * Look at the returned sense and act on the error and detirmine 1846 * The unix error number to pass back... (0 = report no error) 1847 * (-1 = continue processing) 1848 */ 1849int 1850st_interpret_sense(xs) 1851 struct scsi_xfer *xs; 1852{ 1853 struct scsi_sense_data *sense = &xs->sense; 1854 struct scsi_link *sc_link = xs->sc_link; 1855 struct st_softc *st = sc_link->device_softc; 1856 struct buf *bp = xs->bp; 1857 u_int8_t serr = sense->error_code & SSD_ERRCODE; 1858 u_int8_t skey = sense->flags & SSD_KEY; 1859 int32_t info; 1860 1861 if (((sc_link->flags & SDEV_OPEN) == 0) || 1862 (serr != 0x70 && serr != 0x71)) 1863 return (EJUSTRETURN); /* let the generic code handle it */ 1864 1865 switch (skey) { 1866 case SKEY_NO_SENSE: 1867 case SKEY_RECOVERED_ERROR: 1868 case SKEY_MEDIUM_ERROR: 1869 case SKEY_VOLUME_OVERFLOW: 1870 case SKEY_BLANK_CHECK: 1871 break; 1872 default: 1873 return (EJUSTRETURN); 1874 } 1875 1876 /* 1877 * Get the sense fields and work out what code 1878 */ 1879 if (sense->error_code & SSD_ERRCODE_VALID) 1880 info = _4btol(sense->info); 1881 else 1882 info = xs->datalen; /* bad choice if fixed blocks */ 1883 if (st->flags & ST_FIXEDBLOCKS) { 1884 xs->resid = info * st->blksize; 1885 if (sense->flags & SSD_EOM) { 1886 st->flags |= ST_EIO_PENDING; 1887 if (bp) 1888 bp->b_resid = xs->resid; 1889 } 1890 if (sense->flags & SSD_FILEMARK) { 1891 st->flags |= ST_AT_FILEMARK; 1892 if (bp) 1893 bp->b_resid = xs->resid; 1894 } 1895 if (sense->flags & SSD_ILI) { 1896 st->flags |= ST_EIO_PENDING; 1897 if (bp) 1898 bp->b_resid = xs->resid; 1899 if (sense->error_code & SSD_ERRCODE_VALID && 1900 (xs->flags & SCSI_SILENT) == 0) 1901 printf("%s: block wrong size, %d blocks residual\n", 1902 st->sc_dev.dv_xname, info); 1903 1904 /* 1905 * This quirk code helps the drive read 1906 * the first tape block, regardless of 1907 * format. That is required for these 1908 * drives to return proper MODE SENSE 1909 * information. 1910 */ 1911 if ((st->quirks & ST_Q_SENSE_HELP) && 1912 !(sc_link->flags & SDEV_MEDIA_LOADED)) 1913 st->blksize -= 512; 1914 } 1915 /* 1916 * If no data was tranfered, do it immediatly 1917 */ 1918 if (xs->resid >= xs->datalen) { 1919 if (st->flags & ST_EIO_PENDING) 1920 return EIO; 1921 if (st->flags & ST_AT_FILEMARK) { 1922 if (bp) 1923 bp->b_resid = xs->resid; 1924 return 0; 1925 } 1926 } 1927 } else { /* must be variable mode */ 1928 xs->resid = xs->datalen; /* to be sure */ 1929 if (sense->flags & SSD_EOM) 1930 return EIO; 1931 if (sense->flags & SSD_FILEMARK) { 1932 if (bp) 1933 bp->b_resid = bp->b_bcount; 1934 return 0; 1935 } 1936 if (sense->flags & SSD_ILI) { 1937 if (info < 0) { 1938 /* 1939 * the record was bigger than the read 1940 */ 1941 if ((xs->flags & SCSI_SILENT) == 0) 1942 printf("%s: %d-byte record too big\n", 1943 st->sc_dev.dv_xname, 1944 xs->datalen - info); 1945 return (EIO); 1946 } else if (info > xs->datalen) { 1947 /* 1948 * huh? the residual is bigger than the request 1949 */ 1950 if ((xs->flags & SCSI_SILENT) == 0) { 1951 printf( 1952 "%s: bad residual %d out of %d\n", 1953 st->sc_dev.dv_xname, info, 1954 xs->datalen); 1955 return (EIO); 1956 } 1957 } 1958 xs->resid = info; 1959 if (bp) 1960 bp->b_resid = info; 1961 return (0); 1962 } 1963 } 1964 1965 if (skey == SKEY_BLANK_CHECK) { 1966 /* 1967 * This quirk code helps the drive read the first tape block, 1968 * regardless of format. That is required for these drives to 1969 * return proper MODE SENSE information. 1970 */ 1971 if ((st->quirks & ST_Q_SENSE_HELP) && 1972 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 1973 /* still starting */ 1974 st->blksize -= 512; 1975 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 1976 st->flags |= ST_BLANK_READ; 1977 xs->resid = xs->datalen; 1978 if (bp) { 1979 bp->b_resid = xs->resid; 1980 /* return an EOF */ 1981 } 1982 return (0); 1983 } 1984 } 1985 1986 return (EJUSTRETURN); 1987} 1988 1989/* 1990 * The quirk here is that the drive returns some value to st_mode_sense 1991 * incorrectly until the tape has actually passed by the head. 1992 * 1993 * The method is to set the drive to large fixed-block state (user-specified 1994 * density and 1024-byte blocks), then read and rewind to get it to sense the 1995 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 1996 * work, as a last resort, try variable- length blocks. The result will be 1997 * the ability to do an accurate st_mode_sense. 1998 * 1999 * We know we can do a rewind because we just did a load, which implies rewind. 2000 * Rewind seems preferable to space backward if we have a virgin tape. 2001 * 2002 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 2003 * error processing, both part of st_interpret_sense. 2004 */ 2005int 2006st_touch_tape(st) 2007 struct st_softc *st; 2008{ 2009 char *buf; 2010 int readsize; 2011 int error; 2012 2013 buf = malloc(1024, M_TEMP, M_NOWAIT); 2014 if (!buf) 2015 return ENOMEM; 2016 2017 if ((error = st_mode_sense(st, 0)) != 0) 2018 goto bad; 2019 st->blksize = 1024; 2020 do { 2021 switch (st->blksize) { 2022 case 512: 2023 case 1024: 2024 readsize = st->blksize; 2025 st->flags |= ST_FIXEDBLOCKS; 2026 break; 2027 default: 2028 readsize = 1; 2029 st->flags &= ~ST_FIXEDBLOCKS; 2030 } 2031 if ((error = st_mode_select(st, 0)) != 0) 2032 goto bad; 2033 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 2034 if ((error = st_rewind(st, 0, 0)) != 0) { 2035bad: free(buf, M_TEMP); 2036 return error; 2037 } 2038 } while (readsize != 1 && readsize > st->blksize); 2039 2040 free(buf, M_TEMP); 2041 return 0; 2042} 2043 2044int 2045stdump(dev, blkno, va, size) 2046 dev_t dev; 2047 daddr_t blkno; 2048 caddr_t va; 2049 size_t size; 2050{ 2051 2052 /* Not implemented. */ 2053 return ENXIO; 2054} 2055