st.c revision 1.78
1 /* $NetBSD: st.c,v 1.78 1997/10/09 00:43:26 mjacob Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Charles Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Originally written by Julian Elischer (julian (at) tfs.com) 34 * for TRW Financial Systems for use under the MACH(2.5) operating system. 35 * 36 * TRW Financial Systems, in accordance with their agreement with Carnegie 37 * Mellon University, makes this software available to CMU to distribute 38 * or use in any manner that they see fit as long as this message is kept with 39 * the software. For this reason TFS also grants any other persons or 40 * organisations permission to use or modify this software. 41 * 42 * TFS supplies this software to be publicly redistributed 43 * on the understanding that TFS is not responsible for the correct 44 * functioning of this software in any circumstances. 45 * 46 * Ported to run under 386BSD by Julian Elischer (julian (at) tfs.com) Sept 1992 47 * major changes by Julian Elischer (julian (at) jules.dialix.oz.au) May 1993 48 */ 49 50 /* 51 * To do: 52 * work out some better way of guessing what a good timeout is going 53 * to be depending on whether we expect to retension or not. 54 */ 55 56 #include "opt_scsiverbose.h" 57 58 #include <sys/types.h> 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/fcntl.h> 62 #include <sys/errno.h> 63 #include <sys/ioctl.h> 64 #include <sys/malloc.h> 65 #include <sys/buf.h> 66 #include <sys/proc.h> 67 #include <sys/user.h> 68 #include <sys/mtio.h> 69 #include <sys/device.h> 70 #include <sys/conf.h> 71 72 #include <dev/scsipi/scsi_all.h> 73 #include <dev/scsipi/scsipi_all.h> 74 #include <dev/scsipi/scsi_all.h> 75 #include <dev/scsipi/scsi_tape.h> 76 #include <dev/scsipi/scsiconf.h> 77 78 /* Defines for device specific stuff */ 79 #define DEF_FIXED_BSIZE 512 80 #define ST_RETRIES 4 /* only on non IO commands */ 81 82 #define STMODE(z) ( minor(z) & 0x03) 83 #define STDSTY(z) ((minor(z) >> 2) & 0x03) 84 #define STUNIT(z) ((minor(z) >> 4) ) 85 #define CTLMODE 3 86 87 /* 88 * Maximum density code known. 89 */ 90 #define SCSI_2_MAX_DENSITY_CODE 0x45 91 92 /* 93 * Define various devices that we know mis-behave in some way, 94 * and note how they are bad, so we can correct for them 95 */ 96 struct modes { 97 u_int quirks; /* same definitions as in quirkdata */ 98 int blksize; 99 u_int8_t density; 100 }; 101 102 struct quirkdata { 103 u_int quirks; 104 #define ST_Q_FORCE_BLKSIZE 0x0001 105 #define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */ 106 #define ST_Q_IGNORE_LOADS 0x0004 107 #define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */ 108 #define ST_Q_UNIMODAL 0x0010 /* unimode drive rejects mode select */ 109 u_int page_0_size; 110 #define MAX_PAGE_0_SIZE 64 111 struct modes modes[4]; 112 }; 113 114 struct st_quirk_inquiry_pattern { 115 struct scsipi_inquiry_pattern pattern; 116 struct quirkdata quirkdata; 117 }; 118 119 struct st_quirk_inquiry_pattern st_quirk_patterns[] = { 120 {{T_SEQUENTIAL, T_REMOV, 121 " ", " ", " "}, {0, 0, { 122 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 123 {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */ 124 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */ 125 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */ 126 }}}, 127 {{T_SEQUENTIAL, T_REMOV, 128 "TANDBERG", " TDC 3600 ", ""}, {0, 12, { 129 {0, 0, 0}, /* minor 0-3 */ 130 {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 131 {0, 0, QIC_150}, /* minor 8-11 */ 132 {0, 0, QIC_120} /* minor 12-15 */ 133 }}}, 134 {{T_SEQUENTIAL, T_REMOV, 135 "TANDBERG", " TDC 3800 ", ""}, {0, 0, { 136 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 137 {0, 0, QIC_525}, /* minor 4-7 */ 138 {0, 0, QIC_150}, /* minor 8-11 */ 139 {0, 0, QIC_120} /* minor 12-15 */ 140 }}}, 141 /* 142 * At least -005 and -007 need this. I'll assume they all do unless I 143 * hear otherwise. - mycroft, 31MAR1994 144 */ 145 {{T_SEQUENTIAL, T_REMOV, 146 "ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, { 147 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 148 {ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */ 149 {0, 0, QIC_150}, /* minor 8-11 */ 150 {0, 0, QIC_120} /* minor 12-15 */ 151 }}}, 152 /* 153 * One user reports that this works for his tape drive. It probably 154 * needs more work. - mycroft, 09APR1994 155 */ 156 {{T_SEQUENTIAL, T_REMOV, 157 "SANKYO ", "CP525 ", ""}, {0, 0, { 158 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 159 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 160 {0, 0, QIC_150}, /* minor 8-11 */ 161 {0, 0, QIC_120} /* minor 12-15 */ 162 }}}, 163 {{T_SEQUENTIAL, T_REMOV, 164 "ANRITSU ", "DMT780 ", ""}, {0, 0, { 165 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 166 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 167 {0, 0, QIC_150}, /* minor 8-11 */ 168 {0, 0, QIC_120} /* minor 12-15 */ 169 }}}, 170 {{T_SEQUENTIAL, T_REMOV, 171 "ARCHIVE ", "VIPER 150 21247", ""}, {0, 12, { 172 {0, 0, 0}, /* minor 0-3 */ 173 {0, 0, QIC_150}, /* minor 4-7 */ 174 {0, 0, QIC_120}, /* minor 8-11 */ 175 {0, 0, QIC_24} /* minor 12-15 */ 176 }}}, 177 {{T_SEQUENTIAL, T_REMOV, 178 "WANGTEK ", "5099ES SCSI", ""}, {0, 0, { 179 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 180 {0, 0, QIC_11}, /* minor 4-7 */ 181 {0, 0, QIC_24}, /* minor 8-11 */ 182 {0, 0, QIC_24} /* minor 12-15 */ 183 }}}, 184 {{T_SEQUENTIAL, T_REMOV, 185 "WANGTEK ", "5150ES SCSI", ""}, {0, 0, { 186 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 187 {0, 0, QIC_24}, /* minor 4-7 */ 188 {0, 0, QIC_120}, /* minor 8-11 */ 189 {0, 0, QIC_150} /* minor 12-15 */ 190 }}}, 191 {{T_SEQUENTIAL, T_REMOV, 192 "WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, { 193 {0, 0, 0}, /* minor 0-3 */ 194 {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 195 {0, 0, QIC_150}, /* minor 8-11 */ 196 {0, 0, QIC_120} /* minor 12-15 */ 197 }}}, 198 {{T_SEQUENTIAL, T_REMOV, 199 "WangDAT ", "Model 1300 ", ""}, {0, 0, { 200 {0, 0, 0}, /* minor 0-3 */ 201 {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */ 202 {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */ 203 {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */ 204 }}}, 205 {{T_SEQUENTIAL, T_REMOV, 206 "EXABYTE ", "EXB-8200 ", "263H"}, {0, 5, { 207 {0, 0, 0}, /* minor 0-3 */ 208 {0, 0, 0}, /* minor 4-7 */ 209 {0, 0, 0}, /* minor 8-11 */ 210 {0, 0, 0} /* minor 12-15 */ 211 }}}, 212 {{T_SEQUENTIAL, T_REMOV, 213 "IBM", "03590", ""}, {ST_Q_IGNORE_LOADS, 0, { 214 {0, 0, 0}, /* minor 0-3 */ 215 {0, 0, 0}, /* minor 4-7 */ 216 {0, 0, 0}, /* minor 8-11 */ 217 {0, 0, 0} /* minor 12-15 */ 218 }}}, 219 {{T_SEQUENTIAL, T_REMOV, 220 "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, 0, { 221 {0, 0, QIC_3095}, /* minor 0-3 */ 222 {0, 0, QIC_3095}, /* minor 4-7 */ 223 {0, 0, QIC_3095}, /* minor 8-11 */ 224 {0, 0, QIC_3095}, /* minor 12-15 */ 225 }}}, 226 #if 0 227 {{T_SEQUENTIAL, T_REMOV, 228 "EXABYTE ", "EXB-8200 ", ""}, {0, 12, { 229 {0, 0, 0}, /* minor 0-3 */ 230 {0, 0, 0}, /* minor 4-7 */ 231 {0, 0, 0}, /* minor 8-11 */ 232 {0, 0, 0} /* minor 12-15 */ 233 }}}, 234 #endif 235 }; 236 237 #define NOEJECT 0 238 #define EJECT 1 239 240 struct st_softc { 241 struct device sc_dev; 242 /*--------------------present operating parameters, flags etc.---------------*/ 243 int flags; /* see below */ 244 u_int quirks; /* quirks for the open mode */ 245 int blksize; /* blksize we are using */ 246 u_int8_t density; /* present density */ 247 u_int page_0_size; /* size of page 0 data */ 248 u_int last_dsty; /* last density opened */ 249 /*--------------------device/scsi parameters---------------------------------*/ 250 struct scsipi_link *sc_link; /* our link to the adpter etc. */ 251 /*--------------------parameters reported by the device ---------------------*/ 252 int blkmin; /* min blk size */ 253 int blkmax; /* max blk size */ 254 struct quirkdata *quirkdata; /* if we have a rogue entry */ 255 /*--------------------parameters reported by the device for this media-------*/ 256 u_long numblks; /* nominal blocks capacity */ 257 int media_blksize; /* 0 if not ST_FIXEDBLOCKS */ 258 u_int8_t media_density; /* this is what it said when asked */ 259 /*--------------------quirks for the whole drive-----------------------------*/ 260 u_int drive_quirks; /* quirks of this drive */ 261 /*--------------------How we should set up when opening each minor device----*/ 262 struct modes modes[4]; /* plus more for each mode */ 263 u_int8_t modeflags[4]; /* flags for the modes */ 264 #define DENSITY_SET_BY_USER 0x01 265 #define DENSITY_SET_BY_QUIRK 0x02 266 #define BLKSIZE_SET_BY_USER 0x04 267 #define BLKSIZE_SET_BY_QUIRK 0x08 268 /*--------------------storage for sense data returned by the drive-----------*/ 269 u_char sense_data[MAX_PAGE_0_SIZE]; /* 270 * additional sense data needed 271 * for mode sense/select. 272 */ 273 struct buf buf_queue; /* the queue of pending IO */ 274 /* operations */ 275 }; 276 277 278 #ifdef __BROKEN_INDIRECT_CONFIG 279 int stmatch __P((struct device *, void *, void *)); 280 #else 281 int stmatch __P((struct device *, struct cfdata *, void *)); 282 #endif 283 void stattach __P((struct device *, struct device *, void *)); 284 void st_identify_drive __P((struct st_softc *, 285 struct scsipi_inquiry_pattern *)); 286 void st_loadquirks __P((struct st_softc *)); 287 int st_mount_tape __P((dev_t, int)); 288 void st_unmount __P((struct st_softc *, boolean)); 289 int st_decide_mode __P((struct st_softc *, boolean)); 290 void ststart __P((void *)); 291 int st_read __P((struct st_softc *, char *, int, int)); 292 int st_read_block_limits __P((struct st_softc *, int)); 293 int st_mode_sense __P((struct st_softc *, int)); 294 int st_mode_select __P((struct st_softc *, int)); 295 int st_cmprss __P((struct st_softc *, int)); 296 int st_space __P((struct st_softc *, int, u_int, int)); 297 int st_write_filemarks __P((struct st_softc *, int, int)); 298 int st_check_eod __P((struct st_softc *, boolean, int *, int)); 299 int st_load __P((struct st_softc *, u_int, int)); 300 int st_rewind __P((struct st_softc *, u_int, int)); 301 int st_interpret_sense __P((struct scsipi_xfer *)); 302 int st_touch_tape __P((struct st_softc *)); 303 int st_erase __P((struct st_softc *, int full, int flags)); 304 int st_rdpos __P((struct st_softc *, int, u_int32_t *)); 305 int st_setpos __P((struct st_softc *, int, u_int32_t *)); 306 307 struct cfattach st_ca = { 308 sizeof(struct st_softc), stmatch, stattach 309 }; 310 311 struct cfdriver st_cd = { 312 NULL, "st", DV_TAPE 313 }; 314 315 struct scsipi_device st_switch = { 316 st_interpret_sense, 317 ststart, 318 NULL, 319 NULL, 320 }; 321 322 #define ST_INFO_VALID 0x0001 323 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 324 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 325 #define ST_FIXEDBLOCKS 0x0008 326 #define ST_AT_FILEMARK 0x0010 327 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 328 #define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 329 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 330 #define ST_FM_WRITTEN 0x0100 /* 331 * EOF file mark written -- used with 332 * ~ST_WRITTEN to indicate that multiple file 333 * marks have been written 334 */ 335 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 336 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 337 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 338 #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 339 340 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 341 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 342 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 343 ST_2FM_AT_EOD | ST_PER_ACTION) 344 345 struct scsipi_inquiry_pattern st_patterns[] = { 346 {T_SEQUENTIAL, T_REMOV, 347 "", "", ""}, 348 }; 349 350 int 351 stmatch(parent, match, aux) 352 struct device *parent; 353 #ifdef __BROKEN_INDIRECT_CONFIG 354 void *match; 355 #else 356 struct cfdata *match; 357 #endif 358 void *aux; 359 { 360 struct scsipibus_attach_args *sa = aux; 361 int priority; 362 363 (void)scsipi_inqmatch(&sa->sa_inqbuf, 364 (caddr_t)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 */ 373 void 374 stattach(parent, self, aux) 375 struct device *parent, *self; 376 void *aux; 377 { 378 struct st_softc *st = (void *)self; 379 struct scsipibus_attach_args *sa = aux; 380 struct scsipi_link *sc_link = sa->sa_sc_link; 381 382 SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); 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 sc_link->openings = 1; 391 392 /* 393 * Check if the drive is a known criminal and take 394 * Any steps needed to bring it into line 395 */ 396 st_identify_drive(st, &sa->sa_inqbuf); 397 398 /* 399 * Use the subdriver to request information regarding 400 * the drive. We cannot use interrupts yet, so the 401 * request must specify this. 402 */ 403 printf("\n"); 404 printf("%s: %s", st->sc_dev.dv_xname, st->quirkdata ? "rogue, " : ""); 405 if (scsipi_test_unit_ready(sc_link, 406 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE) || 407 st_mode_sense(st, 408 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE)) 409 printf("drive empty\n"); 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 /* 429 * Use the inquiry routine in 'scsi_base' to get drive info so we can 430 * Further tailor our behaviour. 431 */ 432 void 433 st_identify_drive(st, inqbuf) 434 struct st_softc *st; 435 struct scsipi_inquiry_pattern *inqbuf; 436 { 437 struct st_quirk_inquiry_pattern *finger; 438 int priority; 439 440 finger = (struct st_quirk_inquiry_pattern *)scsipi_inqmatch(inqbuf, 441 (caddr_t)st_quirk_patterns, 442 sizeof(st_quirk_patterns) / sizeof(st_quirk_patterns[0]), 443 sizeof(st_quirk_patterns[0]), &priority); 444 if (priority != 0) { 445 st->quirkdata = &finger->quirkdata; 446 st->drive_quirks = finger->quirkdata.quirks; 447 st->quirks = finger->quirkdata.quirks; /* start value */ 448 st->page_0_size = finger->quirkdata.page_0_size; 449 st_loadquirks(st); 450 } 451 } 452 453 /* 454 * initialise the subdevices to the default (QUIRK) state. 455 * this will remove any setting made by the system operator or previous 456 * operations. 457 */ 458 void 459 st_loadquirks(st) 460 struct st_softc *st; 461 { 462 int i; 463 struct modes *mode; 464 struct modes *mode2; 465 466 mode = st->quirkdata->modes; 467 mode2 = st->modes; 468 for (i = 0; i < 4; i++) { 469 bzero(mode2, sizeof(struct modes)); 470 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 471 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 472 DENSITY_SET_BY_USER); 473 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 474 mode2->blksize = mode->blksize; 475 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 476 } 477 if (mode->density) { 478 mode2->density = mode->density; 479 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 480 } 481 mode++; 482 mode2++; 483 } 484 } 485 486 /* 487 * open the device. 488 */ 489 int 490 stopen(dev, flags, mode, p) 491 dev_t dev; 492 int flags; 493 int mode; 494 struct proc *p; 495 { 496 int unit; 497 u_int stmode, dsty; 498 int error = 0; 499 struct st_softc *st; 500 struct scsipi_link *sc_link; 501 502 unit = STUNIT(dev); 503 if (unit >= st_cd.cd_ndevs) 504 return (ENXIO); 505 st = st_cd.cd_devs[unit]; 506 if (st == NULL) 507 return (ENXIO); 508 509 stmode = STMODE(dev); 510 dsty = STDSTY(dev); 511 sc_link = st->sc_link; 512 513 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 514 unit, st_cd.cd_ndevs)); 515 516 /* 517 * Only allow one at a time 518 */ 519 if (sc_link->flags & SDEV_OPEN) { 520 printf("%s: already open\n", st->sc_dev.dv_xname); 521 return (EBUSY); 522 } 523 524 /* 525 * Catch any unit attention errors. 526 */ 527 error = scsipi_test_unit_ready(sc_link, SCSI_IGNORE_MEDIA_CHANGE | 528 (stmode == CTLMODE ? SCSI_IGNORE_NOT_READY : 0)); 529 if (error) 530 goto bad; 531 532 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 533 534 /* 535 * If the mode is 3 (e.g. minor = 3,7,11,15) 536 * then the device has been opened to set defaults 537 * This mode does NOT ALLOW I/O, only ioctls 538 */ 539 if (stmode == CTLMODE) 540 return (0); 541 542 /* 543 * if it's a different mode, or if the media has been 544 * invalidated, unmount the tape from the previous 545 * session but continue with open processing 546 */ 547 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 548 st_unmount(st, NOEJECT); 549 550 /* 551 * If we are not mounted, then we should start a new 552 * mount session. 553 */ 554 if (!(st->flags & ST_MOUNTED)) { 555 st_mount_tape(dev, flags); 556 st->last_dsty = dsty; 557 } 558 559 /* 560 * Make sure that a tape opened in write-only mode will have 561 * file marks written on it when closed, even if not written to. 562 * This is for SUN compatibility 563 */ 564 if ((flags & O_ACCMODE) == FWRITE) 565 st->flags |= ST_WRITTEN; 566 567 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 568 return (0); 569 570 bad: 571 st_unmount(st, NOEJECT); 572 sc_link->flags &= ~SDEV_OPEN; 573 return (error); 574 } 575 576 /* 577 * close the device.. only called if we are the LAST 578 * occurence of an open device 579 */ 580 int 581 stclose(dev, flags, mode, p) 582 dev_t dev; 583 int flags; 584 int mode; 585 struct proc *p; 586 { 587 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 588 589 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 590 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 591 st_write_filemarks(st, 1, 0); 592 switch (STMODE(dev)) { 593 case 0: 594 case 3: /* for now */ 595 st_unmount(st, NOEJECT); 596 break; 597 case 1: 598 /* leave mounted unless media seems to have been removed */ 599 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) 600 st_unmount(st, NOEJECT); 601 break; 602 case 2: 603 st_unmount(st, EJECT); 604 break; 605 } 606 st->sc_link->flags &= ~SDEV_OPEN; 607 608 return (0); 609 } 610 611 /* 612 * Start a new mount session. 613 * Copy in all the default parameters from the selected device mode. 614 * and try guess any that seem to be defaulted. 615 */ 616 int 617 st_mount_tape(dev, flags) 618 dev_t dev; 619 int flags; 620 { 621 int unit; 622 u_int mode, dsty; 623 struct st_softc *st; 624 struct scsipi_link *sc_link; 625 int error = 0; 626 627 unit = STUNIT(dev); 628 mode = STMODE(dev); 629 dsty = STDSTY(dev); 630 st = st_cd.cd_devs[unit]; 631 sc_link = st->sc_link; 632 633 if (st->flags & ST_MOUNTED) 634 return (0); 635 636 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 637 st->flags |= ST_NEW_MOUNT; 638 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 639 /* 640 * If the media is new, then make sure we give it a chance to 641 * to do a 'load' instruction. (We assume it is new.) 642 */ 643 if ((error = st_load(st, LD_LOAD, 0)) != 0) 644 return (error); 645 /* 646 * Throw another dummy instruction to catch 647 * 'Unit attention' errors. Some drives appear to give 648 * these after doing a Load instruction. 649 * (noteably some DAT drives) 650 */ 651 scsipi_test_unit_ready(sc_link, SCSI_SILENT); /* XXX */ 652 653 /* 654 * Some devices can't tell you much until they have been 655 * asked to look at the media. This quirk does this. 656 */ 657 if (st->quirks & ST_Q_SENSE_HELP) 658 if ((error = st_touch_tape(st)) != 0) 659 return (error); 660 /* 661 * Load the physical device parameters 662 * loads: blkmin, blkmax 663 */ 664 if ((error = st_read_block_limits(st, 0)) != 0) 665 return (error); 666 /* 667 * Load the media dependent parameters 668 * includes: media_blksize,media_density,numblks 669 * As we have a tape in, it should be reflected here. 670 * If not you may need the "quirk" above. 671 */ 672 if ((error = st_mode_sense(st, 0)) != 0) 673 return (error); 674 /* 675 * If we have gained a permanent density from somewhere, 676 * then use it in preference to the one supplied by 677 * default by the driver. 678 */ 679 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 680 st->density = st->modes[dsty].density; 681 else 682 st->density = st->media_density; 683 /* 684 * If we have gained a permanent blocksize 685 * then use it in preference to the one supplied by 686 * default by the driver. 687 */ 688 st->flags &= ~ST_FIXEDBLOCKS; 689 if (st->modeflags[dsty] & 690 (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 691 st->blksize = st->modes[dsty].blksize; 692 if (st->blksize) 693 st->flags |= ST_FIXEDBLOCKS; 694 } else { 695 if ((error = st_decide_mode(st, FALSE)) != 0) 696 return (error); 697 } 698 if ((error = st_mode_select(st, 0)) != 0) { 699 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 700 return (error); 701 } 702 scsipi_prevent(sc_link, PR_PREVENT, 703 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 704 st->flags &= ~ST_NEW_MOUNT; 705 st->flags |= ST_MOUNTED; 706 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 707 708 return (0); 709 } 710 711 /* 712 * End the present mount session. 713 * Rewind, and optionally eject the tape. 714 * Reset various flags to indicate that all new 715 * operations require another mount operation 716 */ 717 void 718 st_unmount(st, eject) 719 struct st_softc *st; 720 boolean eject; 721 { 722 struct scsipi_link *sc_link = st->sc_link; 723 int nmarks; 724 725 if (!(st->flags & ST_MOUNTED)) 726 return; 727 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 728 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 729 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 730 scsipi_prevent(sc_link, PR_ALLOW, 731 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 732 if (eject) 733 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 734 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 735 sc_link->flags &= ~SDEV_MEDIA_LOADED; 736 } 737 738 /* 739 * Given all we know about the device, media, mode, 'quirks' and 740 * initial operation, make a decision as to how we should be set 741 * to run (regarding blocking and EOD marks) 742 */ 743 int 744 st_decide_mode(st, first_read) 745 struct st_softc *st; 746 boolean first_read; 747 { 748 #ifdef SCSIDEBUG 749 struct scsipi_link *sc_link = st->sc_link; 750 #endif 751 752 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 753 754 /* 755 * If the drive can only handle fixed-length blocks and only at 756 * one size, perhaps we should just do that. 757 */ 758 if (st->blkmin && (st->blkmin == st->blkmax)) { 759 st->flags |= ST_FIXEDBLOCKS; 760 st->blksize = st->blkmin; 761 SC_DEBUG(sc_link, SDEV_DB3, 762 ("blkmin == blkmax of %d\n", st->blkmin)); 763 goto done; 764 } 765 /* 766 * If the tape density mandates (or even suggests) use of fixed 767 * or variable-length blocks, comply. 768 */ 769 switch (st->density) { 770 case HALFINCH_800: 771 case HALFINCH_1600: 772 case HALFINCH_6250: 773 case DDS: 774 st->flags &= ~ST_FIXEDBLOCKS; 775 st->blksize = 0; 776 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 777 goto done; 778 case QIC_11: 779 case QIC_24: 780 case QIC_120: 781 case QIC_150: 782 case QIC_525: 783 case QIC_1320: 784 st->flags |= ST_FIXEDBLOCKS; 785 if (st->media_blksize > 0) 786 st->blksize = st->media_blksize; 787 else 788 st->blksize = DEF_FIXED_BSIZE; 789 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 790 goto done; 791 } 792 /* 793 * If we're about to read the tape, perhaps we should choose 794 * fixed or variable-length blocks and block size according to 795 * what the drive found on the tape. 796 */ 797 if (first_read && 798 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 799 (st->media_blksize == DEF_FIXED_BSIZE) || 800 (st->media_blksize == 1024))) { 801 if (st->media_blksize > 0) 802 st->flags |= ST_FIXEDBLOCKS; 803 else 804 st->flags &= ~ST_FIXEDBLOCKS; 805 st->blksize = st->media_blksize; 806 SC_DEBUG(sc_link, SDEV_DB3, 807 ("Used media_blksize of %d\n", st->media_blksize)); 808 goto done; 809 } 810 /* 811 * We're getting no hints from any direction. Choose variable- 812 * length blocks arbitrarily. 813 */ 814 st->flags &= ~ST_FIXEDBLOCKS; 815 st->blksize = 0; 816 SC_DEBUG(sc_link, SDEV_DB3, 817 ("Give up and default to variable mode\n")); 818 819 done: 820 /* 821 * Decide whether or not to write two file marks to signify end- 822 * of-data. Make the decision as a function of density. If 823 * the decision is not to use a second file mark, the SCSI BLANK 824 * CHECK condition code will be recognized as end-of-data when 825 * first read. 826 * (I think this should be a by-product of fixed/variable..julian) 827 */ 828 switch (st->density) { 829 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 830 case QIC_11: 831 case QIC_24: 832 case QIC_120: 833 case QIC_150: 834 case QIC_525: 835 case QIC_1320: 836 st->flags &= ~ST_2FM_AT_EOD; 837 break; 838 default: 839 st->flags |= ST_2FM_AT_EOD; 840 } 841 return (0); 842 } 843 844 /* 845 * Actually translate the requested transfer into 846 * one the physical driver can understand 847 * The transfer is described by a buf and will include 848 * only one physical transfer. 849 */ 850 void 851 ststrategy(bp) 852 struct buf *bp; 853 { 854 struct st_softc *st = st_cd.cd_devs[STUNIT(bp->b_dev)]; 855 struct buf *dp; 856 int s; 857 858 SC_DEBUG(st->sc_link, SDEV_DB1, 859 ("ststrategy %ld bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); 860 /* 861 * If it's a null transfer, return immediatly 862 */ 863 if (bp->b_bcount == 0) 864 goto done; 865 /* 866 * Odd sized request on fixed drives are verboten 867 */ 868 if (st->flags & ST_FIXEDBLOCKS) { 869 if (bp->b_bcount % st->blksize) { 870 printf("%s: bad request, must be multiple of %d\n", 871 st->sc_dev.dv_xname, st->blksize); 872 bp->b_error = EIO; 873 goto bad; 874 } 875 } 876 /* 877 * as are out-of-range requests on variable drives. 878 */ 879 else if (bp->b_bcount < st->blkmin || 880 (st->blkmax && bp->b_bcount > st->blkmax)) { 881 printf("%s: bad request, must be between %d and %d\n", 882 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 883 bp->b_error = EIO; 884 goto bad; 885 } 886 s = splbio(); 887 888 /* 889 * Place it in the queue of activities for this tape 890 * at the end (a bit silly because we only have on user.. 891 * (but it could fork())) 892 */ 893 dp = &st->buf_queue; 894 bp->b_actf = NULL; 895 bp->b_actb = dp->b_actb; 896 *dp->b_actb = bp; 897 dp->b_actb = &bp->b_actf; 898 899 /* 900 * Tell the device to get going on the transfer if it's 901 * not doing anything, otherwise just wait for completion 902 * (All a bit silly if we're only allowing 1 open but..) 903 */ 904 ststart(st); 905 906 splx(s); 907 return; 908 bad: 909 bp->b_flags |= B_ERROR; 910 done: 911 /* 912 * Correctly set the buf to indicate a completed xfer 913 */ 914 bp->b_resid = bp->b_bcount; 915 biodone(bp); 916 return; 917 } 918 919 /* 920 * ststart looks to see if there is a buf waiting for the device 921 * and that the device is not already busy. If both are true, 922 * It dequeues the buf and creates a scsi command to perform the 923 * transfer required. The transfer request will call scsipi_done 924 * on completion, which will in turn call this routine again 925 * so that the next queued transfer is performed. 926 * The bufs are queued by the strategy routine (ststrategy) 927 * 928 * This routine is also called after other non-queued requests 929 * have been made of the scsi driver, to ensure that the queue 930 * continues to be drained. 931 * ststart() is called at splbio 932 */ 933 void 934 ststart(v) 935 void *v; 936 { 937 struct st_softc *st = v; 938 struct scsipi_link *sc_link = st->sc_link; 939 register struct buf *bp, *dp; 940 struct scsi_rw_tape cmd; 941 int flags; 942 943 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 944 /* 945 * See if there is a buf to do and we are not already 946 * doing one 947 */ 948 while (sc_link->openings > 0) { 949 /* if a special awaits, let it proceed first */ 950 if (sc_link->flags & SDEV_WAITING) { 951 sc_link->flags &= ~SDEV_WAITING; 952 wakeup((caddr_t)sc_link); 953 return; 954 } 955 956 dp = &st->buf_queue; 957 if ((bp = dp->b_actf) == NULL) 958 return; 959 if ((dp = bp->b_actf) != NULL) 960 dp->b_actb = bp->b_actb; 961 else 962 st->buf_queue.b_actb = bp->b_actb; 963 *bp->b_actb = dp; 964 965 /* 966 * if the device has been unmounted byt the user 967 * then throw away all requests until done 968 */ 969 if (!(st->flags & ST_MOUNTED) || 970 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 971 /* make sure that one implies the other.. */ 972 sc_link->flags &= ~SDEV_MEDIA_LOADED; 973 bp->b_flags |= B_ERROR; 974 bp->b_error = EIO; 975 bp->b_resid = bp->b_bcount; 976 biodone(bp); 977 continue; 978 } 979 /* 980 * only FIXEDBLOCK devices have pending operations 981 */ 982 if (st->flags & ST_FIXEDBLOCKS) { 983 /* 984 * If we are at a filemark but have not reported it yet 985 * then we should report it now 986 */ 987 if (st->flags & ST_AT_FILEMARK) { 988 if ((bp->b_flags & B_READ) == B_WRITE) { 989 /* 990 * Handling of ST_AT_FILEMARK in 991 * st_space will fill in the right file 992 * mark count. 993 * Back up over filemark 994 */ 995 if (st_space(st, 0, SP_FILEMARKS, 0)) { 996 bp->b_flags |= B_ERROR; 997 bp->b_error = EIO; 998 biodone(bp); 999 continue; 1000 } 1001 } else { 1002 bp->b_resid = bp->b_bcount; 1003 bp->b_error = 0; 1004 bp->b_flags &= ~B_ERROR; 1005 st->flags &= ~ST_AT_FILEMARK; 1006 biodone(bp); 1007 continue; /* seek more work */ 1008 } 1009 } 1010 /* 1011 * If we are at EIO (e.g. EOM) but have not reported it 1012 * yet then we should report it now 1013 */ 1014 if (st->flags & ST_EIO_PENDING) { 1015 bp->b_resid = bp->b_bcount; 1016 bp->b_error = EIO; 1017 bp->b_flags |= B_ERROR; 1018 st->flags &= ~ST_EIO_PENDING; 1019 biodone(bp); 1020 continue; /* seek more work */ 1021 } 1022 } 1023 1024 /* 1025 * Fill out the scsi command 1026 */ 1027 bzero(&cmd, sizeof(cmd)); 1028 if ((bp->b_flags & B_READ) == B_WRITE) { 1029 cmd.opcode = WRITE; 1030 st->flags &= ~ST_FM_WRITTEN; 1031 st->flags |= ST_WRITTEN; 1032 flags = SCSI_DATA_OUT; 1033 } else { 1034 cmd.opcode = READ; 1035 flags = SCSI_DATA_IN; 1036 } 1037 1038 /* 1039 * Handle "fixed-block-mode" tape drives by using the 1040 * block count instead of the length. 1041 */ 1042 if (st->flags & ST_FIXEDBLOCKS) { 1043 cmd.byte2 |= SRW_FIXED; 1044 _lto3b(bp->b_bcount / st->blksize, cmd.len); 1045 } else 1046 _lto3b(bp->b_bcount, cmd.len); 1047 1048 /* 1049 * go ask the adapter to do all this for us 1050 */ 1051 if ((*sc_link->scsipi_cmd)(sc_link, 1052 (struct scsipi_generic *)&cmd, sizeof(cmd), 1053 (u_char *)bp->b_data, bp->b_bcount, 1054 0, 100000, bp, flags | SCSI_NOSLEEP)) 1055 printf("%s: not queued\n", st->sc_dev.dv_xname); 1056 } /* go back and see if we can cram more work in.. */ 1057 } 1058 1059 int 1060 stread(dev, uio, iomode) 1061 dev_t dev; 1062 struct uio *uio; 1063 int iomode; 1064 { 1065 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1066 1067 return (physio(ststrategy, NULL, dev, B_READ, 1068 st->sc_link->adapter->scsipi_minphys, uio)); 1069 } 1070 1071 int 1072 stwrite(dev, uio, iomode) 1073 dev_t dev; 1074 struct uio *uio; 1075 int iomode; 1076 { 1077 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1078 1079 return (physio(ststrategy, NULL, dev, B_WRITE, 1080 st->sc_link->adapter->scsipi_minphys, uio)); 1081 } 1082 1083 /* 1084 * Perform special action on behalf of the user; 1085 * knows about the internals of this device 1086 */ 1087 int 1088 stioctl(dev, cmd, arg, flag, p) 1089 dev_t dev; 1090 u_long cmd; 1091 caddr_t arg; 1092 int flag; 1093 struct proc *p; 1094 { 1095 int error = 0; 1096 int unit; 1097 int number, nmarks, dsty; 1098 int flags; 1099 struct st_softc *st; 1100 int hold_blksize; 1101 u_int8_t hold_density; 1102 struct mtop *mt = (struct mtop *) arg; 1103 1104 /* 1105 * Find the device that the user is talking about 1106 */ 1107 flags = 0; /* give error messages, act on errors etc. */ 1108 unit = STUNIT(dev); 1109 dsty = STDSTY(dev); 1110 st = st_cd.cd_devs[unit]; 1111 hold_blksize = st->blksize; 1112 hold_density = st->density; 1113 1114 switch ((u_int) cmd) { 1115 1116 case MTIOCGET: { 1117 struct mtget *g = (struct mtget *) arg; 1118 1119 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1120 bzero(g, sizeof(struct mtget)); 1121 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1122 g->mt_blksiz = st->blksize; 1123 g->mt_density = st->density; 1124 g->mt_mblksiz[0] = st->modes[0].blksize; 1125 g->mt_mblksiz[1] = st->modes[1].blksize; 1126 g->mt_mblksiz[2] = st->modes[2].blksize; 1127 g->mt_mblksiz[3] = st->modes[3].blksize; 1128 g->mt_mdensity[0] = st->modes[0].density; 1129 g->mt_mdensity[1] = st->modes[1].density; 1130 g->mt_mdensity[2] = st->modes[2].density; 1131 g->mt_mdensity[3] = st->modes[3].density; 1132 break; 1133 } 1134 case MTIOCTOP: { 1135 1136 SC_DEBUG(st->sc_link, SDEV_DB1, 1137 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, 1138 mt->mt_count)); 1139 1140 /* compat: in U*x it is a short */ 1141 number = mt->mt_count; 1142 switch ((short) (mt->mt_op)) { 1143 case MTWEOF: /* write an end-of-file record */ 1144 error = st_write_filemarks(st, number, flags); 1145 break; 1146 case MTBSF: /* backward space file */ 1147 number = -number; 1148 case MTFSF: /* forward space file */ 1149 error = st_check_eod(st, FALSE, &nmarks, flags); 1150 if (!error) 1151 error = st_space(st, number - nmarks, 1152 SP_FILEMARKS, flags); 1153 break; 1154 case MTBSR: /* backward space record */ 1155 number = -number; 1156 case MTFSR: /* forward space record */ 1157 error = st_check_eod(st, TRUE, &nmarks, flags); 1158 if (!error) 1159 error = st_space(st, number, SP_BLKS, flags); 1160 break; 1161 case MTREW: /* rewind */ 1162 error = st_rewind(st, 0, flags); 1163 break; 1164 case MTOFFL: /* rewind and put the drive offline */ 1165 st_unmount(st, EJECT); 1166 break; 1167 case MTNOP: /* no operation, sets status only */ 1168 break; 1169 case MTRETEN: /* retension the tape */ 1170 error = st_load(st, LD_RETENSION, flags); 1171 if (!error) 1172 error = st_load(st, LD_LOAD, flags); 1173 break; 1174 case MTEOM: /* forward space to end of media */ 1175 error = st_check_eod(st, FALSE, &nmarks, flags); 1176 if (!error) 1177 error = st_space(st, 1, SP_EOM, flags); 1178 break; 1179 case MTCACHE: /* enable controller cache */ 1180 st->flags &= ~ST_DONTBUFFER; 1181 goto try_new_value; 1182 case MTNOCACHE: /* disable controller cache */ 1183 st->flags |= ST_DONTBUFFER; 1184 goto try_new_value; 1185 case MTERASE: /* erase volume */ 1186 error = st_erase(st, number, flags); 1187 break; 1188 case MTSETBSIZ: /* Set block size for device */ 1189 #ifdef NOTYET 1190 if (!(st->flags & ST_NEW_MOUNT)) { 1191 uprintf("re-mount tape before changing blocksize"); 1192 error = EINVAL; 1193 break; 1194 } 1195 #endif 1196 if (number == 0) 1197 st->flags &= ~ST_FIXEDBLOCKS; 1198 else { 1199 if ((st->blkmin || st->blkmax) && 1200 (number < st->blkmin || 1201 number > st->blkmax)) { 1202 error = EINVAL; 1203 break; 1204 } 1205 st->flags |= ST_FIXEDBLOCKS; 1206 } 1207 st->blksize = number; 1208 st->flags |= ST_BLOCK_SET; /*XXX */ 1209 goto try_new_value; 1210 1211 case MTSETDNSTY: /* Set density for device and mode */ 1212 if (number > SCSI_2_MAX_DENSITY_CODE) { 1213 error = EINVAL; 1214 break; 1215 } else 1216 st->density = number; 1217 goto try_new_value; 1218 1219 case MTCMPRESS: 1220 error = st_cmprss(st, number); 1221 break; 1222 1223 default: 1224 error = EINVAL; 1225 } 1226 break; 1227 } 1228 case MTIOCIEOT: 1229 case MTIOCEEOT: 1230 break; 1231 1232 case MTIOCRDSPOS: 1233 error = st_rdpos(st, 0, (u_int32_t *) arg); 1234 break; 1235 1236 case MTIOCRDHPOS: 1237 error = st_rdpos(st, 1, (u_int32_t *) arg); 1238 break; 1239 1240 case MTIOCSLOCATE: 1241 error = st_setpos(st, 0, (u_int32_t *) arg); 1242 break; 1243 1244 case MTIOCHLOCATE: 1245 error = st_setpos(st, 1, (u_int32_t *) arg); 1246 break; 1247 1248 default: 1249 if (STMODE(dev) == CTLMODE) 1250 error = scsipi_do_ioctl(st->sc_link, dev, cmd, arg, 1251 flag, p); 1252 else 1253 error = ENOTTY; 1254 break; 1255 } 1256 return (error); 1257 /*-----------------------------*/ 1258 try_new_value: 1259 /* 1260 * Check that the mode being asked for is aggreeable to the 1261 * drive. If not, put it back the way it was. 1262 */ 1263 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */ 1264 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1265 st->density = hold_density; 1266 st->blksize = hold_blksize; 1267 if (st->blksize) 1268 st->flags |= ST_FIXEDBLOCKS; 1269 else 1270 st->flags &= ~ST_FIXEDBLOCKS; 1271 return (error); 1272 } 1273 /* 1274 * As the drive liked it, if we are setting a new default, 1275 * set it into the structures as such. 1276 * 1277 * The means for deciding this are not finalised yet 1278 */ 1279 if (STMODE(dev) == 0x03) { 1280 /* special mode */ 1281 /* XXX */ 1282 switch ((short) (mt->mt_op)) { 1283 case MTSETBSIZ: 1284 st->modes[dsty].blksize = st->blksize; 1285 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1286 break; 1287 case MTSETDNSTY: 1288 st->modes[dsty].density = st->density; 1289 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1290 break; 1291 } 1292 } 1293 return (0); 1294 } 1295 1296 /* 1297 * Do a synchronous read. 1298 */ 1299 int 1300 st_read(st, buf, size, flags) 1301 struct st_softc *st; 1302 int size; 1303 int flags; 1304 char *buf; 1305 { 1306 struct scsi_rw_tape cmd; 1307 1308 /* 1309 * If it's a null transfer, return immediatly 1310 */ 1311 if (size == 0) 1312 return (0); 1313 bzero(&cmd, sizeof(cmd)); 1314 cmd.opcode = READ; 1315 if (st->flags & ST_FIXEDBLOCKS) { 1316 cmd.byte2 |= SRW_FIXED; 1317 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1318 cmd.len); 1319 } else 1320 _lto3b(size, cmd.len); 1321 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1322 (struct scsipi_generic *)&cmd, sizeof(cmd), 1323 (u_char *)buf, size, 0, 100000, NULL, flags | SCSI_DATA_IN)); 1324 } 1325 1326 /* 1327 * Ask the drive what it's min and max blk sizes are. 1328 */ 1329 int 1330 st_read_block_limits(st, flags) 1331 struct st_softc *st; 1332 int flags; 1333 { 1334 struct scsi_block_limits cmd; 1335 struct scsi_block_limits_data block_limits; 1336 struct scsipi_link *sc_link = st->sc_link; 1337 int error; 1338 1339 /* 1340 * First check if we have it all loaded 1341 */ 1342 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1343 return (0); 1344 1345 /* 1346 * do a 'Read Block Limits' 1347 */ 1348 bzero(&cmd, sizeof(cmd)); 1349 cmd.opcode = READ_BLOCK_LIMITS; 1350 1351 /* 1352 * do the command, update the global values 1353 */ 1354 error = (*sc_link->scsipi_cmd)(sc_link, (struct scsipi_generic *)&cmd, 1355 sizeof(cmd), (u_char *)&block_limits, sizeof(block_limits), 1356 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN); 1357 if (error) 1358 return (error); 1359 1360 st->blkmin = _2btol(block_limits.min_length); 1361 st->blkmax = _3btol(block_limits.max_length); 1362 1363 SC_DEBUG(sc_link, SDEV_DB3, 1364 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1365 return (0); 1366 } 1367 1368 /* 1369 * Get the scsi driver to send a full inquiry to the 1370 * device and use the results to fill out the global 1371 * parameter structure. 1372 * 1373 * called from: 1374 * attach 1375 * open 1376 * ioctl (to reset original blksize) 1377 */ 1378 int 1379 st_mode_sense(st, flags) 1380 struct st_softc *st; 1381 int flags; 1382 { 1383 u_int scsipi_sense_len; 1384 int error; 1385 struct scsi_mode_sense cmd; 1386 struct scsipi_sense { 1387 struct scsi_mode_header header; 1388 struct scsi_blk_desc blk_desc; 1389 u_char sense_data[MAX_PAGE_0_SIZE]; 1390 } scsipi_sense; 1391 struct scsipi_link *sc_link = st->sc_link; 1392 1393 scsipi_sense_len = 12 + st->page_0_size; 1394 1395 /* 1396 * Set up a mode sense 1397 */ 1398 bzero(&cmd, sizeof(cmd)); 1399 cmd.opcode = SCSI_MODE_SENSE; 1400 cmd.length = scsipi_sense_len; 1401 1402 /* 1403 * do the command, but we don't need the results 1404 * just print them for our interest's sake, if asked, 1405 * or if we need it as a template for the mode select 1406 * store it away. 1407 */ 1408 error = (*sc_link->scsipi_cmd)(sc_link, (struct scsipi_generic *)&cmd, 1409 sizeof(cmd), (u_char *)&scsipi_sense, scsipi_sense_len, 1410 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN); 1411 if (error) 1412 return (error); 1413 1414 st->numblks = _3btol(scsipi_sense.blk_desc.nblocks); 1415 st->media_blksize = _3btol(scsipi_sense.blk_desc.blklen); 1416 st->media_density = scsipi_sense.blk_desc.density; 1417 if (scsipi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) 1418 st->flags |= ST_READONLY; 1419 SC_DEBUG(sc_link, SDEV_DB3, 1420 ("density code 0x%x, %d-byte blocks, write-%s, ", 1421 st->media_density, st->media_blksize, 1422 st->flags & ST_READONLY ? "protected" : "enabled")); 1423 SC_DEBUG(sc_link, SDEV_DB3, 1424 ("%sbuffered\n", 1425 scsipi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1426 if (st->page_0_size) 1427 bcopy(scsipi_sense.sense_data, st->sense_data, 1428 st->page_0_size); 1429 sc_link->flags |= SDEV_MEDIA_LOADED; 1430 return (0); 1431 } 1432 1433 /* 1434 * Send a filled out parameter structure to the drive to 1435 * set it into the desire modes etc. 1436 */ 1437 int 1438 st_mode_select(st, flags) 1439 struct st_softc *st; 1440 int flags; 1441 { 1442 u_int scsi_select_len; 1443 struct scsi_mode_select cmd; 1444 struct scsi_select { 1445 struct scsi_mode_header header; 1446 struct scsi_blk_desc blk_desc; 1447 u_char sense_data[MAX_PAGE_0_SIZE]; 1448 } scsi_select; 1449 struct scsipi_link *sc_link = st->sc_link; 1450 1451 scsi_select_len = 12 + st->page_0_size; 1452 1453 /* 1454 * This quirk deals with drives that have only one valid mode 1455 * and think this gives them license to reject all mode selects, 1456 * even if the selected mode is the one that is supported. 1457 */ 1458 if (st->quirks & ST_Q_UNIMODAL) { 1459 SC_DEBUG(sc_link, SDEV_DB3, 1460 ("not setting density 0x%x blksize 0x%x\n", 1461 st->density, st->blksize)); 1462 return (0); 1463 } 1464 1465 /* 1466 * Set up for a mode select 1467 */ 1468 bzero(&cmd, sizeof(cmd)); 1469 cmd.opcode = SCSI_MODE_SELECT; 1470 cmd.length = scsi_select_len; 1471 1472 bzero(&scsi_select, scsi_select_len); 1473 scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc); 1474 scsi_select.header.dev_spec &= ~SMH_DSP_BUFF_MODE; 1475 scsi_select.blk_desc.density = st->density; 1476 if (st->flags & ST_DONTBUFFER) 1477 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF; 1478 else 1479 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1480 if (st->flags & ST_FIXEDBLOCKS) 1481 _lto3b(st->blksize, scsi_select.blk_desc.blklen); 1482 if (st->page_0_size) 1483 bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); 1484 1485 /* 1486 * do the command 1487 */ 1488 return ((*sc_link->scsipi_cmd)(sc_link, (struct scsipi_generic *)&cmd, 1489 sizeof(cmd), (u_char *)&scsi_select, scsi_select_len, 1490 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT)); 1491 } 1492 1493 int 1494 st_cmprss(st, onoff) 1495 struct st_softc *st; 1496 int onoff; 1497 { 1498 u_int scsi_dlen; 1499 struct scsi_mode_select mcmd; 1500 struct scsi_mode_sense scmd; 1501 struct scsi_select { 1502 struct scsi_mode_header header; 1503 struct scsi_blk_desc blk_desc; 1504 u_char pdata[max(sizeof(struct scsi_tape_dev_conf_page), 1505 sizeof(struct scsi_tape_dev_compression_page))]; 1506 } scsi_pdata; 1507 struct scsi_tape_dev_conf_page *ptr; 1508 struct scsi_tape_dev_compression_page *cptr; 1509 struct scsipi_link *sc_link = st->sc_link; 1510 int error, ison, flags; 1511 1512 scsi_dlen = sizeof(scsi_pdata); 1513 bzero(&scsi_pdata, scsi_dlen); 1514 1515 /* 1516 * Set up for a mode sense. 1517 * Do DATA COMPRESSION page first. 1518 */ 1519 bzero(&scmd, sizeof(scmd)); 1520 scmd.opcode = SCSI_MODE_SENSE; 1521 scmd.page = SMS_PAGE_CTRL_CURRENT | 0xf; 1522 scmd.length = scsi_dlen; 1523 1524 flags = SCSI_SILENT; 1525 1526 /* 1527 * Do the MODE SENSE command... 1528 */ 1529 again: 1530 error = (*sc_link->scsipi_cmd)(sc_link, 1531 (struct scsipi_generic *)&scmd, sizeof(scmd), 1532 (u_char *)&scsi_pdata, scsi_dlen, 1533 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN); 1534 1535 if (error) { 1536 if (scmd.byte2 != SMS_DBD) { 1537 scmd.byte2 = SMS_DBD; 1538 goto again; 1539 } 1540 return (error); 1541 } 1542 1543 if (scsi_pdata.header.blk_desc_len) 1544 ptr = (struct scsi_tape_dev_conf_page *) scsi_pdata.pdata; 1545 else 1546 ptr = (struct scsi_tape_dev_conf_page *) &scsi_pdata.blk_desc; 1547 1548 if ((scmd.page & SMS_PAGE_CODE) == 0xf) { 1549 cptr = (struct scsi_tape_dev_compression_page *) ptr; 1550 ison = (cptr->dce_dcc & DCP_DCE) != 0; 1551 if (onoff) 1552 cptr->dce_dcc |= DCP_DCE; 1553 else 1554 cptr->dce_dcc &= ~DCP_DCE; 1555 cptr->pagecode &= ~0x80; 1556 } else { 1557 ison = (ptr->sel_comp_alg != 0); 1558 if (onoff) 1559 ptr->sel_comp_alg = 1; 1560 else 1561 ptr->sel_comp_alg = 0; 1562 ptr->pagecode &= ~0x80; 1563 } 1564 onoff = onoff ? 1 : 0; 1565 /* 1566 * There might be a virtue in actually doing the MODE SELECTS, 1567 * but let's not clog the bus over it. 1568 */ 1569 if (onoff == ison) 1570 return (0); 1571 1572 /* 1573 * Set up for a mode select 1574 */ 1575 1576 scsi_pdata.header.data_length = 0; 1577 scsi_pdata.header.medium_type = 0; 1578 if ((st->flags & ST_DONTBUFFER) == 0) 1579 scsi_pdata.header.dev_spec = SMH_DSP_BUFF_MODE_ON; 1580 else 1581 scsi_pdata.header.dev_spec = 0; 1582 1583 bzero(&mcmd, sizeof(mcmd)); 1584 mcmd.opcode = SCSI_MODE_SELECT; 1585 mcmd.byte2 = SMS_PF; 1586 mcmd.length = scsi_dlen; 1587 if (scsi_pdata.header.blk_desc_len) { 1588 scsi_pdata.blk_desc.density = 0; 1589 scsi_pdata.blk_desc.nblocks[0] = 0; 1590 scsi_pdata.blk_desc.nblocks[1] = 0; 1591 scsi_pdata.blk_desc.nblocks[2] = 0; 1592 } 1593 1594 /* 1595 * Do the command 1596 */ 1597 error = (*sc_link->scsipi_cmd)(sc_link, 1598 (struct scsipi_generic *)&mcmd, sizeof(mcmd), 1599 (u_char *)&scsi_pdata, scsi_dlen, 1600 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); 1601 1602 if (error && (scmd.page & SMS_PAGE_CODE) == 0xf) { 1603 /* 1604 * Try DEVICE CONFIGURATION page. 1605 */ 1606 scmd.page = SMS_PAGE_CTRL_CURRENT | 0x10; 1607 goto again; 1608 } 1609 return (error); 1610 } 1611 /* 1612 * issue an erase command 1613 */ 1614 int 1615 st_erase(st, full, flags) 1616 struct st_softc *st; 1617 int full, flags; 1618 { 1619 struct scsi_erase cmd; 1620 1621 /* 1622 * Full erase means set LONG bit in erase command, which asks 1623 * the drive to erase the entire unit. Without this bit, we're 1624 * asking the drive to write an erase gap. 1625 */ 1626 bzero(&cmd, sizeof(cmd)); 1627 cmd.opcode = ERASE; 1628 if (full) 1629 cmd.byte2 = SE_IMMED|SE_LONG; 1630 else 1631 cmd.byte2 = SE_IMMED; 1632 1633 /* 1634 * XXX We always do this asynchronously, for now. How long should 1635 * we wait if we want to (eventually) to it synchronously? 1636 */ 1637 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1638 (struct scsipi_generic *)&cmd, sizeof(cmd), 1639 0, 0, ST_RETRIES, 5000, NULL, flags)); 1640 } 1641 1642 /* 1643 * skip N blocks/filemarks/seq filemarks/eom 1644 */ 1645 int 1646 st_space(st, number, what, flags) 1647 struct st_softc *st; 1648 u_int what; 1649 int flags; 1650 int number; 1651 { 1652 struct scsi_space cmd; 1653 int error; 1654 1655 switch (what) { 1656 case SP_BLKS: 1657 if (st->flags & ST_PER_ACTION) { 1658 if (number > 0) { 1659 st->flags &= ~ST_PER_ACTION; 1660 return (EIO); 1661 } else if (number < 0) { 1662 if (st->flags & ST_AT_FILEMARK) { 1663 /* 1664 * Handling of ST_AT_FILEMARK 1665 * in st_space will fill in the 1666 * right file mark count. 1667 */ 1668 error = st_space(st, 0, SP_FILEMARKS, 1669 flags); 1670 if (error) 1671 return (error); 1672 } 1673 if (st->flags & ST_BLANK_READ) { 1674 st->flags &= ~ST_BLANK_READ; 1675 return (EIO); 1676 } 1677 st->flags &= ~ST_EIO_PENDING; 1678 } 1679 } 1680 break; 1681 case SP_FILEMARKS: 1682 if (st->flags & ST_EIO_PENDING) { 1683 if (number > 0) { 1684 /* pretend we just discovered the error */ 1685 st->flags &= ~ST_EIO_PENDING; 1686 return (EIO); 1687 } else if (number < 0) { 1688 /* back away from the error */ 1689 st->flags &= ~ST_EIO_PENDING; 1690 } 1691 } 1692 if (st->flags & ST_AT_FILEMARK) { 1693 st->flags &= ~ST_AT_FILEMARK; 1694 number--; 1695 } 1696 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1697 /* back away from unwritten tape */ 1698 st->flags &= ~ST_BLANK_READ; 1699 number++; /* XXX dubious */ 1700 } 1701 break; 1702 case SP_EOM: 1703 if (st->flags & ST_EIO_PENDING) { 1704 /* pretend we just discovered the error */ 1705 st->flags &= ~ST_EIO_PENDING; 1706 return (EIO); 1707 } 1708 if (st->flags & ST_AT_FILEMARK) 1709 st->flags &= ~ST_AT_FILEMARK; 1710 break; 1711 } 1712 if (number == 0) 1713 return (0); 1714 1715 bzero(&cmd, sizeof(cmd)); 1716 cmd.opcode = SPACE; 1717 cmd.byte2 = what; 1718 _lto3b(number, cmd.number); 1719 1720 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1721 (struct scsipi_generic *)&cmd, sizeof(cmd), 1722 0, 0, 0, 900000, NULL, flags)); 1723 } 1724 1725 /* 1726 * write N filemarks 1727 */ 1728 int 1729 st_write_filemarks(st, number, flags) 1730 struct st_softc *st; 1731 int flags; 1732 int number; 1733 { 1734 struct scsi_write_filemarks cmd; 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 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1761 (struct scsipi_generic *)&cmd, sizeof(cmd), 1762 0, 0, 0, 100000, NULL, flags)); 1763 } 1764 1765 /* 1766 * Make sure the right number of file marks is on tape if the 1767 * tape has been written. If the position argument is true, 1768 * leave the tape positioned where it was originally. 1769 * 1770 * nmarks returns the number of marks to skip (or, if position 1771 * true, which were skipped) to get back original position. 1772 */ 1773 int 1774 st_check_eod(st, position, nmarks, flags) 1775 struct st_softc *st; 1776 boolean position; 1777 int *nmarks; 1778 int flags; 1779 { 1780 int error; 1781 1782 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1783 default: 1784 *nmarks = 0; 1785 return (0); 1786 case ST_WRITTEN: 1787 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1788 *nmarks = 1; 1789 break; 1790 case ST_WRITTEN | ST_2FM_AT_EOD: 1791 *nmarks = 2; 1792 } 1793 error = st_write_filemarks(st, *nmarks, flags); 1794 if (position && !error) 1795 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1796 return (error); 1797 } 1798 1799 /* 1800 * load/unload/retension 1801 */ 1802 int 1803 st_load(st, type, flags) 1804 struct st_softc *st; 1805 u_int type; 1806 int flags; 1807 { 1808 struct scsi_load cmd; 1809 1810 if (type != LD_LOAD) { 1811 int error; 1812 int nmarks; 1813 1814 error = st_check_eod(st, FALSE, &nmarks, flags); 1815 if (error) 1816 return (error); 1817 } 1818 if (st->quirks & ST_Q_IGNORE_LOADS) 1819 return (0); 1820 1821 bzero(&cmd, sizeof(cmd)); 1822 cmd.opcode = LOAD; 1823 cmd.how = type; 1824 1825 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1826 (struct scsipi_generic *)&cmd, sizeof(cmd), 1827 0, 0, ST_RETRIES, 300000, NULL, flags)); 1828 } 1829 1830 /* 1831 * Rewind the device 1832 */ 1833 int 1834 st_rewind(st, immediate, flags) 1835 struct st_softc *st; 1836 u_int immediate; 1837 int flags; 1838 { 1839 struct scsi_rewind cmd; 1840 int error; 1841 int nmarks; 1842 1843 error = st_check_eod(st, FALSE, &nmarks, flags); 1844 if (error) 1845 return (error); 1846 st->flags &= ~ST_PER_ACTION; 1847 1848 bzero(&cmd, sizeof(cmd)); 1849 cmd.opcode = REWIND; 1850 cmd.byte2 = immediate; 1851 1852 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1853 (struct scsipi_generic *)&cmd, sizeof(cmd), 1854 0, 0, ST_RETRIES, immediate ? 5000 : 300000, NULL, flags)); 1855 } 1856 1857 int 1858 st_rdpos(st, hard, blkptr) 1859 struct st_softc *st; 1860 int hard; 1861 u_int32_t *blkptr; 1862 { 1863 int error; 1864 u_int8_t posdata[20]; 1865 struct scsi_tape_read_position cmd; 1866 1867 /* 1868 * First flush any pending writes... 1869 */ 1870 error = st_write_filemarks(st, 0, SCSI_SILENT); 1871 1872 /* 1873 * The latter case is for 'write protected' tapes 1874 * which are too stupid to recognize a zero count 1875 * for writing filemarks as a no-op. 1876 */ 1877 if (error != 0 && error != EACCES) 1878 return (error); 1879 1880 bzero(&cmd, sizeof(cmd)); 1881 bzero(&posdata, sizeof(posdata)); 1882 cmd.opcode = READ_POSITION; 1883 if (hard) 1884 cmd.byte1 = 1; 1885 1886 error = st->sc_link->scsipi_cmd(st->sc_link, 1887 (struct scsipi_generic *)&cmd, sizeof(cmd), (u_char *)&posdata, 1888 sizeof(posdata), ST_RETRIES, 30000, NULL, SCSI_SILENT|SCSI_DATA_IN); 1889 1890 if (error == 0) { 1891 #if 0 1892 printf("posdata:"); 1893 for (hard = 0; hard < sizeof(posdata); hard++) 1894 printf("%02x ", posdata[hard] & 0xff); 1895 printf("\n"); 1896 #endif 1897 if (posdata[0] & 0x4) /* Block Position Unknown */ 1898 error = EINVAL; 1899 else { 1900 *blkptr = _4btol(&posdata[4]); 1901 } 1902 } 1903 return (error); 1904 } 1905 1906 int 1907 st_setpos(st, hard, blkptr) 1908 struct st_softc *st; 1909 int hard; 1910 u_int32_t *blkptr; 1911 { 1912 int error; 1913 struct scsipi_generic cmd; 1914 1915 /* 1916 * First flush any pending writes. Strictly speaking, 1917 * we're not supposed to have to worry about this, 1918 * but let's be untrusting. 1919 */ 1920 error = st_write_filemarks(st, 0, SCSI_SILENT); 1921 1922 /* 1923 * The latter case is for 'write protected' tapes 1924 * which are too stupid to recognize a zero count 1925 * for writing filemarks as a no-op. 1926 */ 1927 if (error != 0 && error != EACCES) 1928 return (error); 1929 1930 bzero(&cmd, sizeof(cmd)); 1931 cmd.opcode = LOCATE; 1932 if (hard) 1933 cmd.bytes[0] = 1 << 2; 1934 _lto4b(*blkptr, &cmd.bytes[2]); 1935 error = (*st->sc_link->scsipi_cmd)(st->sc_link, &cmd, sizeof(cmd), 1936 NULL, 0, ST_RETRIES, 5000, NULL, 0); 1937 /* 1938 * XXX: Note file && block number position now unknown (if 1939 * XXX: these things ever start being maintained in this driver) 1940 */ 1941 return (error); 1942 } 1943 1944 1945 /* 1946 * Look at the returned sense and act on the error and detirmine 1947 * The unix error number to pass back... (0 = report no error) 1948 * (-1 = continue processing) 1949 */ 1950 int 1951 st_interpret_sense(xs) 1952 struct scsipi_xfer *xs; 1953 { 1954 struct scsipi_link *sc_link = xs->sc_link; 1955 struct scsipi_sense_data *sense = &xs->sense.scsi_sense; 1956 struct buf *bp = xs->bp; 1957 struct st_softc *st = sc_link->device_softc; 1958 u_int8_t key; 1959 int32_t info; 1960 1961 /* 1962 * Get the sense fields and work out what code 1963 */ 1964 if (sense->error_code & SSD_ERRCODE_VALID) 1965 info = _4btol(sense->info); 1966 else 1967 info = xs->datalen; /* bad choice if fixed blocks */ 1968 if ((sense->error_code & SSD_ERRCODE) != 0x70) 1969 return (-1); /* let the generic code handle it */ 1970 #ifdef SCSIVERBOSE 1971 else if ((xs->flags & SCSI_SILENT) == 0) 1972 scsi_print_sense(xs, 0); /* tell folks what happened */ 1973 #endif 1974 if (st->flags & ST_FIXEDBLOCKS) { 1975 xs->resid = info * st->blksize; 1976 if (sense->flags & SSD_EOM) { 1977 st->flags |= ST_EIO_PENDING; 1978 if (bp) 1979 bp->b_resid = xs->resid; 1980 } 1981 if (sense->flags & SSD_FILEMARK) { 1982 st->flags |= ST_AT_FILEMARK; 1983 if (bp) 1984 bp->b_resid = xs->resid; 1985 } 1986 if (sense->flags & SSD_ILI) { 1987 st->flags |= ST_EIO_PENDING; 1988 if (bp) 1989 bp->b_resid = xs->resid; 1990 if (sense->error_code & SSD_ERRCODE_VALID && 1991 (xs->flags & SCSI_SILENT) == 0) 1992 printf("%s: block wrong size, %d blocks residual\n", 1993 st->sc_dev.dv_xname, info); 1994 1995 /* 1996 * This quirk code helps the drive read 1997 * the first tape block, regardless of 1998 * format. That is required for these 1999 * drives to return proper MODE SENSE 2000 * information. 2001 */ 2002 if ((st->quirks & ST_Q_SENSE_HELP) && 2003 !(sc_link->flags & SDEV_MEDIA_LOADED)) 2004 st->blksize -= 512; 2005 } 2006 /* 2007 * If no data was tranfered, do it immediatly 2008 */ 2009 if (xs->resid >= xs->datalen) { 2010 if (st->flags & ST_EIO_PENDING) 2011 return (EIO); 2012 if (st->flags & ST_AT_FILEMARK) { 2013 if (bp) 2014 bp->b_resid = xs->resid; 2015 return (0); 2016 } 2017 } 2018 } else { /* must be variable mode */ 2019 xs->resid = xs->datalen; /* to be sure */ 2020 if (sense->flags & SSD_EOM) 2021 return (EIO); 2022 if (sense->flags & SSD_FILEMARK) { 2023 if (bp) 2024 bp->b_resid = bp->b_bcount; 2025 return (0); 2026 } 2027 if (sense->flags & SSD_ILI) { 2028 if (info < 0) { 2029 /* 2030 * the record was bigger than the read 2031 */ 2032 if ((xs->flags & SCSI_SILENT) == 0) 2033 printf("%s: %d-byte record too big\n", 2034 st->sc_dev.dv_xname, 2035 xs->datalen - info); 2036 return (EIO); 2037 } 2038 xs->resid = info; 2039 if (bp) 2040 bp->b_resid = info; 2041 } 2042 } 2043 key = sense->flags & SSD_KEY; 2044 2045 if (key == 0x8) { 2046 /* 2047 * This quirk code helps the drive read the 2048 * first tape block, regardless of format. That 2049 * is required for these drives to return proper 2050 * MODE SENSE information. 2051 */ 2052 if ((st->quirks & ST_Q_SENSE_HELP) && 2053 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 2054 /* still starting */ 2055 st->blksize -= 512; 2056 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 2057 st->flags |= ST_BLANK_READ; 2058 xs->resid = xs->datalen; 2059 if (bp) { 2060 bp->b_resid = xs->resid; 2061 /* return an EOF */ 2062 } 2063 return (0); 2064 } 2065 } 2066 return (-1); /* let the default/generic handler handle it */ 2067 } 2068 2069 /* 2070 * The quirk here is that the drive returns some value to st_mode_sense 2071 * incorrectly until the tape has actually passed by the head. 2072 * 2073 * The method is to set the drive to large fixed-block state (user-specified 2074 * density and 1024-byte blocks), then read and rewind to get it to sense the 2075 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 2076 * work, as a last resort, try variable- length blocks. The result will be 2077 * the ability to do an accurate st_mode_sense. 2078 * 2079 * We know we can do a rewind because we just did a load, which implies rewind. 2080 * Rewind seems preferable to space backward if we have a virgin tape. 2081 * 2082 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 2083 * error processing, both part of st_interpret_sense. 2084 */ 2085 int 2086 st_touch_tape(st) 2087 struct st_softc *st; 2088 { 2089 char *buf; 2090 int readsize; 2091 int error; 2092 2093 buf = malloc(1024, M_TEMP, M_NOWAIT); 2094 if (buf == NULL) 2095 return (ENOMEM); 2096 2097 if ((error = st_mode_sense(st, 0)) != 0) 2098 goto bad; 2099 st->blksize = 1024; 2100 do { 2101 switch (st->blksize) { 2102 case 512: 2103 case 1024: 2104 readsize = st->blksize; 2105 st->flags |= ST_FIXEDBLOCKS; 2106 break; 2107 default: 2108 readsize = 1; 2109 st->flags &= ~ST_FIXEDBLOCKS; 2110 } 2111 if ((error = st_mode_select(st, 0)) != 0) 2112 goto bad; 2113 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 2114 if ((error = st_rewind(st, 0, 0)) != 0) { 2115 bad: free(buf, M_TEMP); 2116 return (error); 2117 } 2118 } while (readsize != 1 && readsize > st->blksize); 2119 2120 free(buf, M_TEMP); 2121 return (0); 2122 } 2123 2124 int 2125 stdump(dev, blkno, va, size) 2126 dev_t dev; 2127 daddr_t blkno; 2128 caddr_t va; 2129 size_t size; 2130 { 2131 2132 /* Not implemented. */ 2133 return (ENXIO); 2134 } 2135
Indexes created Sun Sep 21 20:09:37 GMT 2025