1/* $NetBSD: st.c,v 1.243 2022/02/23 21:54:41 andvar Exp $ */ 2 3/*- 4 * Copyright (c) 1998, 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/* 33 * Originally written by Julian Elischer (julian@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@tfs.com) Sept 1992 47 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993 48 * 49 * A lot of rewhacking done by mjacob (mjacob@nas.nasa.gov). 50 */ 51 52#include <sys/cdefs.h> 53__KERNEL_RCSID(0, "$NetBSD: st.c,v 1.243 2022/02/23 21:54:41 andvar Exp $"); 54 55#ifdef _KERNEL_OPT 56#include "opt_scsi.h" 57#endif 58 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/bufq.h> 67#include <sys/proc.h> 68#include <sys/mtio.h> 69#include <sys/device.h> 70#include <sys/conf.h> 71#include <sys/kernel.h> 72#include <sys/vnode.h> 73#include <sys/iostat.h> 74#include <sys/sysctl.h> 75 76#include <dev/scsipi/scsi_spc.h> 77#include <dev/scsipi/scsipi_all.h> 78#include <dev/scsipi/scsi_all.h> 79#include <dev/scsipi/scsi_tape.h> 80#include <dev/scsipi/scsipiconf.h> 81#include <dev/scsipi/scsipi_base.h> 82#include <dev/scsipi/stvar.h> 83 84/* Defines for device specific stuff */ 85#define DEF_FIXED_BSIZE 512 86 87#define STMODE(z) ( minor(z) & 0x03) 88#define STDSTY(z) ((minor(z) >> 2) & 0x03) 89#define STUNIT(z) ((minor(z) >> 4) ) 90#define STNMINOR 16 91 92#define NORMAL_MODE 0 93#define NOREW_MODE 1 94#define EJECT_MODE 2 95#define CTRL_MODE 3 96 97#ifndef ST_MOUNT_DELAY 98#define ST_MOUNT_DELAY 0 99#endif 100 101static dev_type_open(stopen); 102static dev_type_close(stclose); 103static dev_type_read(stread); 104static dev_type_write(stwrite); 105static dev_type_ioctl(stioctl); 106static dev_type_strategy(ststrategy); 107static dev_type_dump(stdump); 108 109const struct bdevsw st_bdevsw = { 110 .d_open = stopen, 111 .d_close = stclose, 112 .d_strategy = ststrategy, 113 .d_ioctl = stioctl, 114 .d_dump = stdump, 115 .d_psize = nosize, 116 .d_discard = nodiscard, 117 .d_flag = D_TAPE | D_MPSAFE 118}; 119 120const struct cdevsw st_cdevsw = { 121 .d_open = stopen, 122 .d_close = stclose, 123 .d_read = stread, 124 .d_write = stwrite, 125 .d_ioctl = stioctl, 126 .d_stop = nostop, 127 .d_tty = notty, 128 .d_poll = nopoll, 129 .d_mmap = nommap, 130 .d_kqfilter = nokqfilter, 131 .d_discard = nodiscard, 132 .d_flag = D_TAPE | D_MPSAFE 133}; 134 135/* 136 * Define various devices that we know mis-behave in some way, 137 * and note how they are bad, so we can correct for them 138 */ 139 140static const struct st_quirk_inquiry_pattern st_quirk_patterns[] = { 141 {{T_SEQUENTIAL, T_REMOV, 142 " ", " ", " "}, {0, 0, { 143 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 144 {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */ 145 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */ 146 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */ 147 }}}, 148 {{T_SEQUENTIAL, T_REMOV, 149 "TANDBERG", " TDC 3600 ", ""}, {0, 12, { 150 {0, 0, 0}, /* minor 0-3 */ 151 {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 152 {0, 0, QIC_150}, /* minor 8-11 */ 153 {0, 0, QIC_120} /* minor 12-15 */ 154 }}}, 155 {{T_SEQUENTIAL, T_REMOV, 156 "TANDBERG", " TDC 3800 ", ""}, {0, 0, { 157 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 158 {0, 0, 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 "TANDBERG", " SLR5 4/8GB ", ""}, {0, 0, { 164 {ST_Q_FORCE_BLKSIZE, 1024, 0}, /* minor 0-3 */ 165 {0, 0, 0}, /* minor 4-7 */ 166 {0, 0, 0}, /* minor 8-11 */ 167 {0, 0, 0} /* minor 12-15 */ 168 }}}, 169 /* 170 * lacking a manual for the 4200, it's not clear what the 171 * specific density codes should be- the device is a 2.5GB 172 * capable QIC drive, those density codes aren't readily 173 * available. The 'default' will just have to do. 174 */ 175 {{T_SEQUENTIAL, T_REMOV, 176 "TANDBERG", " TDC 4200 ", ""}, {0, 0, { 177 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 178 {0, 0, QIC_525}, /* minor 4-7 */ 179 {0, 0, QIC_150}, /* minor 8-11 */ 180 {0, 0, QIC_120} /* minor 12-15 */ 181 }}}, 182 /* 183 * At least -005 and -007 need this. I'll assume they all do unless I 184 * hear otherwise. - mycroft, 31MAR1994 185 */ 186 {{T_SEQUENTIAL, T_REMOV, 187 "ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, { 188 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 189 {ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */ 190 {0, 0, QIC_150}, /* minor 8-11 */ 191 {0, 0, QIC_120} /* minor 12-15 */ 192 }}}, 193 /* 194 * One user reports that this works for his tape drive. It probably 195 * needs more work. - mycroft, 09APR1994 196 */ 197 {{T_SEQUENTIAL, T_REMOV, 198 "SANKYO ", "CP525 ", ""}, {0, 0, { 199 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 200 {ST_Q_FORCE_BLKSIZE, 512, 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 "ANRITSU ", "DMT780 ", ""}, {0, 0, { 206 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 207 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 208 {0, 0, QIC_150}, /* minor 8-11 */ 209 {0, 0, QIC_120} /* minor 12-15 */ 210 }}}, 211 {{T_SEQUENTIAL, T_REMOV, 212 "ARCHIVE ", "VIPER 150 21247", ""}, {ST_Q_ERASE_NOIMM, 12, { 213 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 214 {0, 0, QIC_150}, /* minor 4-7 */ 215 {0, 0, QIC_120}, /* minor 8-11 */ 216 {0, 0, QIC_24} /* minor 12-15 */ 217 }}}, 218 {{T_SEQUENTIAL, T_REMOV, 219 "ARCHIVE ", "VIPER 150 21531", ""}, {ST_Q_ERASE_NOIMM, 12, { 220 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 221 {0, 0, QIC_150}, /* minor 4-7 */ 222 {0, 0, QIC_120}, /* minor 8-11 */ 223 {0, 0, QIC_24} /* minor 12-15 */ 224 }}}, 225 {{T_SEQUENTIAL, T_REMOV, 226 "WANGTEK ", "5099ES SCSI", ""}, {0, 0, { 227 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 228 {0, 0, QIC_11}, /* minor 4-7 */ 229 {0, 0, QIC_24}, /* minor 8-11 */ 230 {0, 0, QIC_24} /* minor 12-15 */ 231 }}}, 232 {{T_SEQUENTIAL, T_REMOV, 233 "WANGTEK ", "5150ES SCSI", ""}, {0, 0, { 234 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 235 {0, 0, QIC_24}, /* minor 4-7 */ 236 {0, 0, QIC_120}, /* minor 8-11 */ 237 {0, 0, QIC_150} /* minor 12-15 */ 238 }}}, 239 {{T_SEQUENTIAL, T_REMOV, 240 "WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, { 241 {0, 0, 0}, /* minor 0-3 */ 242 {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 243 {0, 0, QIC_150}, /* minor 8-11 */ 244 {0, 0, QIC_120} /* minor 12-15 */ 245 }}}, 246 {{T_SEQUENTIAL, T_REMOV, 247 "WangDAT ", "Model 1300 ", ""}, {0, 0, { 248 {0, 0, 0}, /* minor 0-3 */ 249 {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */ 250 {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */ 251 {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */ 252 }}}, 253 {{T_SEQUENTIAL, T_REMOV, 254 "EXABYTE ", "EXB-8200 ", "263H"}, {0, 5, { 255 {0, 0, 0}, /* minor 0-3 */ 256 {0, 0, 0}, /* minor 4-7 */ 257 {0, 0, 0}, /* minor 8-11 */ 258 {0, 0, 0} /* minor 12-15 */ 259 }}}, 260 {{T_SEQUENTIAL, T_REMOV, 261 "STK", "9490", ""}, 262 {ST_Q_FORCE_BLKSIZE, 0, { 263 {0, 0, 0}, /* minor 0-3 */ 264 {0, 0, 0}, /* minor 4-7 */ 265 {0, 0, 0}, /* minor 8-11 */ 266 {0, 0, 0} /* minor 12-15 */ 267 }}}, 268 {{T_SEQUENTIAL, T_REMOV, 269 "STK", "SD-3", ""}, 270 {ST_Q_FORCE_BLKSIZE, 0, { 271 {0, 0, 0}, /* minor 0-3 */ 272 {0, 0, 0}, /* minor 4-7 */ 273 {0, 0, 0}, /* minor 8-11 */ 274 {0, 0, 0} /* minor 12-15 */ 275 }}}, 276 {{T_SEQUENTIAL, T_REMOV, 277 "IBM", "03590", ""}, {ST_Q_IGNORE_LOADS, 0, { 278 {0, 0, 0}, /* minor 0-3 */ 279 {0, 0, 0}, /* minor 4-7 */ 280 {0, 0, 0}, /* minor 8-11 */ 281 {0, 0, 0} /* minor 12-15 */ 282 }}}, 283 {{T_SEQUENTIAL, T_REMOV, 284 "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, 0, { 285 {0, 0, QIC_3095}, /* minor 0-3 */ 286 {0, 0, QIC_3095}, /* minor 4-7 */ 287 {0, 0, QIC_3095}, /* minor 8-11 */ 288 {0, 0, QIC_3095}, /* minor 12-15 */ 289 }}}, 290#if 0 291 {{T_SEQUENTIAL, T_REMOV, 292 "EXABYTE ", "EXB-8200 ", ""}, {0, 12, { 293 {0, 0, 0}, /* minor 0-3 */ 294 {0, 0, 0}, /* minor 4-7 */ 295 {0, 0, 0}, /* minor 8-11 */ 296 {0, 0, 0} /* minor 12-15 */ 297 }}}, 298#endif 299 {{T_SEQUENTIAL, T_REMOV, 300 "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, 0, { 301 {0, 0, 0}, /* minor 0-3 */ 302 {0, 0, 0}, /* minor 4-7 */ 303 {0, 0, 0}, /* minor 8-11 */ 304 {0, 0, 0} /* minor 12-15 */ 305 }}}, 306 {{T_SEQUENTIAL, T_REMOV, 307 "OnStream", "ADR50 Drive", ""}, {ST_Q_UNIMODAL, 0, { 308 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 309 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 4-7 */ 310 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */ 311 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 12-15 */ 312 }}}, 313 {{T_SEQUENTIAL, T_REMOV, 314 "OnStream DI-30", "", "1.0"}, {ST_Q_NOFILEMARKS, 0, { 315 {0, 0, 0}, /* minor 0-3 */ 316 {0, 0, 0}, /* minor 4-7 */ 317 {0, 0, 0}, /* minor 8-11 */ 318 {0, 0, 0} /* minor 12-15 */ 319 }}}, 320 {{T_SEQUENTIAL, T_REMOV, 321 "NCR H621", "0-STD-03-46F880 ", ""}, {ST_Q_NOPREVENT, 0, { 322 {0, 0, 0}, /* minor 0-3 */ 323 {0, 0, 0}, /* minor 4-7 */ 324 {0, 0, 0}, /* minor 8-11 */ 325 {0, 0, 0} /* minor 12-15 */ 326 }}}, 327 {{T_SEQUENTIAL, T_REMOV, 328 "Seagate STT3401A", "hp0atxa", ""}, {0, 0, { 329 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 330 {ST_Q_FORCE_BLKSIZE, 1024, 0}, /* minor 4-7 */ 331 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */ 332 {ST_Q_FORCE_BLKSIZE, 512, 0} /* minor 12-15 */ 333 }}}, 334}; 335 336#define NOEJECT 0 337#define EJECT 1 338 339static void st_identify_drive(struct st_softc *, 340 struct scsipi_inquiry_pattern *); 341static void st_loadquirks(struct st_softc *); 342static int st_mount_tape(dev_t, int); 343static void st_unmount(struct st_softc *, boolean); 344static int st_decide_mode(struct st_softc *, boolean); 345static void ststart(struct scsipi_periph *); 346static int ststart1(struct scsipi_periph *, struct buf *, int *); 347static void strestart(void *); 348static void stdone(struct scsipi_xfer *, int); 349static int st_read(struct st_softc *, char *, int, int); 350static int st_space(struct st_softc *, int, u_int, int); 351static int st_write_filemarks(struct st_softc *, int, int); 352static int st_check_eod(struct st_softc *, boolean, int *, int); 353static int st_load(struct st_softc *, u_int, int); 354static int st_rewind(struct st_softc *, u_int, int); 355static int st_interpret_sense(struct scsipi_xfer *); 356static int st_touch_tape(struct st_softc *); 357static int st_erase(struct st_softc *, int full, int flags); 358static void st_updatefilepos(struct st_softc *); 359static int st_rdpos(struct st_softc *, int, uint32_t *); 360static int st_setpos(struct st_softc *, int, uint32_t *); 361 362static const struct scsipi_periphsw st_switch = { 363 st_interpret_sense, 364 ststart, 365 NULL, 366 stdone 367}; 368 369#if defined(ST_ENABLE_EARLYWARN) 370#define ST_INIT_FLAGS ST_EARLYWARN 371#else 372#define ST_INIT_FLAGS 0 373#endif 374 375/* 376 * The routine called by the low level scsi routine when it discovers 377 * A device suitable for this driver 378 */ 379void 380stattach(device_t parent, device_t self, void *aux) 381{ 382 struct st_softc *st = device_private(self); 383 struct scsipibus_attach_args *sa = aux; 384 struct scsipi_periph *periph = sa->sa_periph; 385 386 SC_DEBUG(periph, SCSIPI_DB2, ("stattach: ")); 387 st->sc_dev = self; 388 389 /* Store information needed to contact our base driver */ 390 st->sc_periph = periph; 391 periph->periph_dev = st->sc_dev; 392 periph->periph_switch = &st_switch; 393 394 /* Set initial flags */ 395 st->flags = ST_INIT_FLAGS; 396 397 /* Set up the buf queues for this device */ 398 bufq_alloc(&st->buf_queue, "fcfs", 0); 399 bufq_alloc(&st->buf_defer, "fcfs", 0); 400 callout_init(&st->sc_callout, 0); 401 mutex_init(&st->sc_iolock, MUTEX_DEFAULT, IPL_VM); 402 403 /* 404 * Check if the drive is a known criminal and take 405 * Any steps needed to bring it into line 406 */ 407 st_identify_drive(st, &sa->sa_inqbuf); 408 aprint_naive("\n"); 409 aprint_normal("\n"); 410 /* Use the subdriver to request information regarding the drive. */ 411 aprint_normal_dev(self, "%s", st->quirkdata ? "quirks apply, " : ""); 412 if (scsipi_test_unit_ready(periph, 413 XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE) || 414 st->ops(st, ST_OPS_MODESENSE, 415 XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE)) 416 aprint_normal("drive empty\n"); 417 else { 418 aprint_normal("density code %d, ", st->media_density); 419 if (st->media_blksize > 0) 420 aprint_normal("%d-byte", st->media_blksize); 421 else 422 aprint_normal("variable"); 423 aprint_normal(" blocks, write-%s\n", 424 (st->flags & ST_READONLY) ? "protected" : "enabled"); 425 } 426 427 st->stats = iostat_alloc(IOSTAT_TAPE, parent, 428 device_xname(st->sc_dev)); 429 430 rnd_attach_source(&st->rnd_source, device_xname(st->sc_dev), 431 RND_TYPE_TAPE, RND_FLAG_DEFAULT); 432} 433 434int 435stdetach(device_t self, int flags) 436{ 437 struct st_softc *st = device_private(self); 438 struct scsipi_periph *periph = st->sc_periph; 439 struct scsipi_channel *chan = periph->periph_channel; 440 int bmaj, cmaj, mn; 441 442 /* locate the major number */ 443 bmaj = bdevsw_lookup_major(&st_bdevsw); 444 cmaj = cdevsw_lookup_major(&st_cdevsw); 445 446 /* kill any pending restart */ 447 callout_halt(&st->sc_callout, NULL); 448 449 mutex_enter(chan_mtx(chan)); 450 451 /* Kill off any queued buffers. */ 452 bufq_drain(st->buf_defer); 453 bufq_drain(st->buf_queue); 454 455 /* Kill off any pending commands. */ 456 scsipi_kill_pending(st->sc_periph); 457 458 mutex_exit(chan_mtx(chan)); 459 460 bufq_free(st->buf_defer); 461 bufq_free(st->buf_queue); 462 mutex_destroy(&st->sc_iolock); 463 464 /* Nuke the vnodes for any open instances */ 465 mn = STUNIT(device_unit(self)); 466 vdevgone(bmaj, mn, mn+STNMINOR-1, VBLK); 467 vdevgone(cmaj, mn, mn+STNMINOR-1, VCHR); 468 469 iostat_free(st->stats); 470 471 /* Unhook the entropy source. */ 472 rnd_detach_source(&st->rnd_source); 473 474 return 0; 475} 476 477/* 478 * Use the inquiry routine in 'scsi_base' to get drive info so we can 479 * Further tailor our behaviour. 480 */ 481static void 482st_identify_drive(struct st_softc *st, struct scsipi_inquiry_pattern *inqbuf) 483{ 484 const struct st_quirk_inquiry_pattern *finger; 485 int priority; 486 487 finger = scsipi_inqmatch(inqbuf, 488 st_quirk_patterns, 489 sizeof(st_quirk_patterns) / sizeof(st_quirk_patterns[0]), 490 sizeof(st_quirk_patterns[0]), &priority); 491 if (priority != 0) { 492 st->quirkdata = &finger->quirkdata; 493 st->drive_quirks = finger->quirkdata.quirks; 494 st->quirks = finger->quirkdata.quirks; /* start value */ 495 st->page_0_size = finger->quirkdata.page_0_size; 496 KASSERT(st->page_0_size <= MAX_PAGE_0_SIZE); 497 st_loadquirks(st); 498 } 499} 500 501/* 502 * initialise the subdevices to the default (QUIRK) state. 503 * this will remove any setting made by the system operator or previous 504 * operations. 505 */ 506static void 507st_loadquirks(struct st_softc *st) 508{ 509 const struct modes *mode; 510 struct modes *mode2; 511 int i; 512 513 mode = st->quirkdata->modes; 514 mode2 = st->modes; 515 for (i = 0; i < 4; i++) { 516 memset(mode2, 0, sizeof(struct modes)); 517 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 518 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 519 DENSITY_SET_BY_USER); 520 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 521 mode2->blksize = mode->blksize; 522 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 523 } 524 if (mode->density) { 525 mode2->density = mode->density; 526 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 527 } 528 mode2->quirks |= mode->quirks; 529 mode++; 530 mode2++; 531 } 532} 533 534/* open the device. */ 535static int 536stopen(dev_t dev, int flags, int mode, struct lwp *l) 537{ 538 u_int stmode, dsty; 539 int error, sflags, unit, tries, ntries; 540 struct st_softc *st; 541 struct scsipi_periph *periph; 542 struct scsipi_adapter *adapt; 543 544 unit = STUNIT(dev); 545 st = device_lookup_private(&st_cd, unit); 546 if (st == NULL) 547 return ENXIO; 548 549 stmode = STMODE(dev); 550 dsty = STDSTY(dev); 551 552 periph = st->sc_periph; 553 adapt = periph->periph_channel->chan_adapter; 554 555 SC_DEBUG(periph, SCSIPI_DB1, 556 ("open: dev=0x%"PRIx64" (unit %d (of %d))\n", dev, unit, 557 st_cd.cd_ndevs)); 558 559 /* Only allow one at a time */ 560 if (periph->periph_flags & PERIPH_OPEN) { 561 aprint_error_dev(st->sc_dev, "already open\n"); 562 return EBUSY; 563 } 564 565 if ((error = scsipi_adapter_addref(adapt)) != 0) 566 return error; 567 568 /* clear any latched errors. */ 569 st->mt_resid = 0; 570 st->mt_erreg = 0; 571 st->asc = 0; 572 st->ascq = 0; 573 574 /* 575 * Catch any unit attention errors. Be silent about this 576 * unless we're already mounted. We ignore media change 577 * if we're in control mode or not mounted yet. 578 */ 579 if ((st->flags & ST_MOUNTED) == 0 || stmode == CTRL_MODE) { 580#ifdef SCSIDEBUG 581 sflags = XS_CTL_IGNORE_MEDIA_CHANGE; 582#else 583 sflags = XS_CTL_SILENT|XS_CTL_IGNORE_MEDIA_CHANGE; 584#endif 585 } else 586 sflags = 0; 587 588 /* 589 * If we're already mounted or we aren't configured for 590 * a mount delay, only try a test unit ready once. Otherwise, 591 * try up to ST_MOUNT_DELAY times with a rest interval of 592 * one second between each try. 593 */ 594 if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0) 595 ntries = 1; 596 else 597 ntries = ST_MOUNT_DELAY; 598 599 for (error = tries = 0; tries < ntries; tries++) { 600 int slpintr, oflags; 601 602 /* 603 * If we had no error, or we're opening the control mode 604 * device, we jump out right away. 605 */ 606 error = scsipi_test_unit_ready(periph, sflags); 607 if (error == 0 || stmode == CTRL_MODE) 608 break; 609 610 /* 611 * We had an error. 612 * 613 * If we're already mounted or we aren't configured for 614 * a mount delay, or the error isn't a NOT READY error, 615 * skip to the error exit now. 616 */ 617 if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0 || 618 (st->mt_key != SKEY_NOT_READY)) { 619 device_printf(st->sc_dev, 620 "mount error (sense key=%d) - " 621 "terminating mount session\n", 622 st->mt_key); 623 /* 624 * the following should not trigger unless 625 * something serious happened while the device 626 * was open (PREVENT MEDIUM REMOVAL in effect) 627 */ 628 if (st->flags & ST_WRITTEN && 629 st->mt_key == SKEY_UNIT_ATTENTION) { 630 /* 631 * device / media state may have changed 632 * refrain from writing missing file marks 633 * onto potentially newly inserted/formatted 634 * media (e. g. emergency EJECT/RESET/etc.) 635 */ 636 st->flags &= ~(ST_WRITTEN|ST_FM_WRITTEN); 637 638 device_printf(st->sc_dev, 639 "CAUTION: file marks/data may be missing" 640 " - ASC = 0x%02x, ASCQ = 0x%02x\n", 641 st->asc, st->ascq); 642 } 643 goto bad; 644 } 645 646 /* clear any latched errors. */ 647 st->mt_resid = 0; 648 st->mt_erreg = 0; 649 st->asc = 0; 650 st->ascq = 0; 651 652 /* 653 * Fake that we have the device open so 654 * we block other apps from getting in. 655 */ 656 oflags = periph->periph_flags; 657 periph->periph_flags |= PERIPH_OPEN; 658 659 slpintr = kpause("stload", true, hz, NULL); 660 661 periph->periph_flags = oflags; /* restore flags */ 662 if (slpintr != 0 && slpintr != EWOULDBLOCK) { 663 device_printf(st->sc_dev, "load interrupted\n"); 664 goto bad; 665 } 666 } 667 668 /* 669 * If the mode is 3 (e.g. minor = 3,7,11,15) then the device has 670 * been opened to set defaults and perform other, usually non-I/O 671 * related, operations. In this case, do a quick check to see 672 * whether the unit actually had a tape loaded (this will be known 673 * as to whether or not we got a NOT READY for the above 674 * unit attention). If a tape is there, go do a mount sequence. 675 */ 676 if (stmode == CTRL_MODE && 677 st->mt_key != SKEY_NO_SENSE && 678 st->mt_key != SKEY_UNIT_ATTENTION) { 679 periph->periph_flags |= PERIPH_OPEN; 680 return 0; 681 } 682 683 /* 684 * If we get this far and had an error set, that means we failed 685 * to pass the 'test unit ready' test for the non-controlmode device, 686 * so we bounce the open. 687 */ 688 if (error) 689 return error; 690 691 /* Else, we're now committed to saying we're open. */ 692 periph->periph_flags |= PERIPH_OPEN; /* unit attn are now errors */ 693 694 /* 695 * If it's a different mode, or if the media has been 696 * invalidated, unmount the tape from the previous 697 * session but continue with open processing 698 */ 699 if (st->last_dsty != dsty || 700 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) 701 st_unmount(st, NOEJECT); 702 703 /* 704 * If we are not mounted, then we should start a new 705 * mount session. 706 */ 707 if (!(st->flags & ST_MOUNTED)) { 708 if ((error = st_mount_tape(dev, flags)) != 0) 709 goto bad; 710 st->last_dsty = dsty; 711 } 712 if (!(st->quirks & ST_Q_NOPREVENT)) { 713 scsipi_prevent(periph, SPAMR_PREVENT_DT, 714 XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY); 715 } 716 717 SC_DEBUG(periph, SCSIPI_DB2, ("open complete\n")); 718 return 0; 719 720bad: 721 st_unmount(st, NOEJECT); 722 scsipi_adapter_delref(adapt); 723 periph->periph_flags &= ~PERIPH_OPEN; 724 return error; 725} 726 727static int 728stclose(dev_t dev, int flags, int mode, struct lwp *l) 729{ 730 int stxx, error = 0; 731 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev)); 732 struct scsipi_periph *periph = st->sc_periph; 733 struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter; 734 735 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("closing\n")); 736 737 /* 738 * Make sure that a tape opened in write-only mode will have 739 * file marks written on it when closed, even if not written to. 740 * 741 * This is for SUN compatibility. Actually, the Sun way of 742 * things is to: 743 * 744 * only write filemarks if there are fmks to be written and 745 * - open for write (possibly read/write) 746 * - the last operation was a write 747 * or: 748 * - opened for wronly 749 * - no data was written (including filemarks) 750 */ 751 752 stxx = st->flags & (ST_WRITTEN | ST_FM_WRITTEN); 753 if ((flags & FWRITE) != 0) { 754 int nm = 0; 755#ifdef ST_SUNCOMPAT 756 /* 757 * on request only 758 * original compat code has not been working 759 * since ~1998 760 */ 761 if ((flags & O_ACCMODE) == FWRITE && (stxx == 0)) { 762 st->flags |= ST_WRITTEN; 763 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 764 ("SUN compatibility: write FM(s) at close\n")); 765 } 766#endif 767 error = st_check_eod(st, FALSE, &nm, 0); 768 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 769 ("wrote %d FM(s) at close error=%d\n", nm, error)); 770 } 771 772 /* Allow robots to eject tape if needed. */ 773 if (!(st->quirks & ST_Q_NOPREVENT)) { 774 scsipi_prevent(periph, SPAMR_ALLOW, 775 XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY); 776 } 777 778 switch (STMODE(dev)) { 779 case NORMAL_MODE: 780 st_unmount(st, NOEJECT); 781 break; 782 case NOREW_MODE: 783 case CTRL_MODE: 784 /* 785 * Leave mounted unless media seems to have been removed. 786 * 787 * Otherwise, if we're to terminate a tape with more than one 788 * filemark [ and because we're not rewinding here ], backspace 789 * one filemark so that later appends will see an unbroken 790 * sequence of: 791 * 792 * file - FMK - file - FMK ... file - FMK FMK (EOM) 793 */ 794 if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) { 795 st_unmount(st, NOEJECT); 796 } else if (error == 0) { 797 /* 798 * ST_WRITTEN was preserved from above. 799 * 800 * All we need to know here is: 801 * 802 * Were we writing this tape and was the last 803 * operation a write? 804 * 805 * Are there supposed to be 2FM at EOD? 806 * 807 * If both statements are true, then we backspace 808 * one filemark. 809 */ 810 stxx &= ~ST_FM_WRITTEN; 811 stxx |= (st->flags & ST_2FM_AT_EOD); 812 if ((flags & FWRITE) != 0 && 813 (stxx == (ST_2FM_AT_EOD|ST_WRITTEN))) { 814 error = st_space(st, -1, SP_FILEMARKS, 0); 815 SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("st_space(-1) error=%d\n", error)); 816 } else { 817 SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("no backspacing - flags = 0x%x, stxx=0x%x, st->flags=0x%x\n", flags, stxx, st->flags)); 818 } 819 } else { 820 SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("error %d from st_check_eod\n", error)); 821 } 822 823 break; 824 case EJECT_MODE: 825 st_unmount(st, EJECT); 826 break; 827 } 828 829 KASSERTMSG((st->flags & ST_WRITTEN) == 0, 830 "pending ST_WRITTEN flag NOT cleared (flags=0x%x)", st->flags); 831 832 scsipi_wait_drain(periph); 833 834 scsipi_adapter_delref(adapt); 835 periph->periph_flags &= ~PERIPH_OPEN; 836 837 return error; 838} 839 840/* 841 * Start a new mount session. 842 * Copy in all the default parameters from the selected device mode. 843 * and try guess any that seem to be defaulted. 844 */ 845static int 846st_mount_tape(dev_t dev, int flags) 847{ 848 int unit; 849 u_int dsty; 850 struct st_softc *st; 851 struct scsipi_periph *periph; 852 int error = 0; 853 854 unit = STUNIT(dev); 855 dsty = STDSTY(dev); 856 st = device_lookup_private(&st_cd, unit); 857 periph = st->sc_periph; 858 859 if (st->flags & ST_MOUNTED) 860 return 0; 861 862 SC_DEBUG(periph, SCSIPI_DB1, ("mounting\n ")); 863 st->flags |= ST_NEW_MOUNT; 864 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 865 /* 866 * If the media is new, then make sure we give it a chance to 867 * to do a 'load' instruction. (We assume it is new.) 868 */ 869 if ((error = st_load(st, LD_LOAD, XS_CTL_SILENT)) != 0) 870 return error; 871 /* 872 * Throw another dummy instruction to catch 873 * 'Unit attention' errors. Many drives give 874 * these after doing a Load instruction (with 875 * the MEDIUM MAY HAVE CHANGED asc/ascq). 876 */ 877 scsipi_test_unit_ready(periph, XS_CTL_SILENT); /* XXX */ 878 879 /* 880 * Some devices can't tell you much until they have been 881 * asked to look at the media. This quirk does this. 882 */ 883 if (st->quirks & ST_Q_SENSE_HELP) 884 if ((error = st_touch_tape(st)) != 0) 885 return error; 886 /* 887 * Load the physical device parameters 888 * loads: blkmin, blkmax 889 */ 890 if ((error = st->ops(st, ST_OPS_RBL, 0)) != 0) 891 return error; 892 /* 893 * Load the media dependent parameters 894 * includes: media_blksize,media_density,numblks 895 * As we have a tape in, it should be reflected here. 896 * If not you may need the "quirk" above. 897 */ 898 if ((error = st->ops(st, ST_OPS_MODESENSE, 0)) != 0) 899 return error; 900 /* 901 * If we have gained a permanent density from somewhere, 902 * then use it in preference to the one supplied by 903 * default by the driver. 904 */ 905 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 906 st->density = st->modes[dsty].density; 907 else 908 st->density = st->media_density; 909 /* 910 * If we have gained a permanent blocksize 911 * then use it in preference to the one supplied by 912 * default by the driver. 913 */ 914 st->flags &= ~ST_FIXEDBLOCKS; 915 if (st->modeflags[dsty] & 916 (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 917 st->blksize = st->modes[dsty].blksize; 918 if (st->blksize) 919 st->flags |= ST_FIXEDBLOCKS; 920 } else { 921 if ((error = st_decide_mode(st, FALSE)) != 0) 922 return error; 923 } 924 if ((error = st->ops(st, ST_OPS_MODESELECT, 0)) != 0) { 925 /* ATAPI will return ENODEV for this, and this may be OK */ 926 if (error != ENODEV) { 927 aprint_error_dev(st->sc_dev, 928 "cannot set selected mode\n"); 929 return error; 930 } 931 } 932 st->flags &= ~ST_NEW_MOUNT; 933 st->flags |= ST_MOUNTED; 934 periph->periph_flags |= PERIPH_MEDIA_LOADED; /* move earlier? */ 935 st->blkno = st->fileno = (daddr_t) 0; 936 return 0; 937} 938 939/* 940 * End the present mount session. 941 * Rewind, and optionally eject the tape. 942 * Reset various flags to indicate that all new 943 * operations require another mount operation 944 */ 945static void 946st_unmount(struct st_softc *st, boolean eject) 947{ 948 struct scsipi_periph *periph = st->sc_periph; 949 int nmarks; 950 951 if ((st->flags & ST_MOUNTED) == 0) 952 return; 953 SC_DEBUG(periph, SCSIPI_DB1, ("unmounting\n")); 954 st_check_eod(st, FALSE, &nmarks, XS_CTL_IGNORE_NOT_READY); 955 st_rewind(st, 0, XS_CTL_IGNORE_NOT_READY); 956 957 /* 958 * Section 9.3.3 of the SCSI specs states that a device shall return 959 * the density value specified in the last successful MODE SELECT 960 * after an unload operation, in case it is not able to 961 * automatically determine the density of the new medium. 962 * 963 * So we instruct the device to use the default density, which will 964 * prevent the use of stale density values (in particular, 965 * in st_touch_tape(). 966 */ 967 st->density = 0; 968 if (st->ops(st, ST_OPS_MODESELECT, 0) != 0) { 969 aprint_error_dev(st->sc_dev, 970 "WARNING: cannot revert to default density\n"); 971 } 972 973 if (eject) { 974 if (!(st->quirks & ST_Q_NOPREVENT)) { 975 scsipi_prevent(periph, SPAMR_ALLOW, 976 XS_CTL_IGNORE_ILLEGAL_REQUEST | 977 XS_CTL_IGNORE_NOT_READY); 978 } 979 st_load(st, LD_UNLOAD, XS_CTL_IGNORE_NOT_READY); 980 st->blkno = st->fileno = (daddr_t) -1; 981 } else { 982 st->blkno = st->fileno = (daddr_t) 0; 983 } 984 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 985 periph->periph_flags &= ~PERIPH_MEDIA_LOADED; 986} 987 988/* 989 * Given all we know about the device, media, mode, 'quirks' and 990 * initial operation, make a decision as to how we should be set 991 * to run (regarding blocking and EOD marks) 992 */ 993int 994st_decide_mode(struct st_softc *st, boolean first_read) 995{ 996 997 SC_DEBUG(st->sc_periph, SCSIPI_DB2, ("starting block mode decision\n")); 998 999 /* 1000 * If the drive can only handle fixed-length blocks and only at 1001 * one size, perhaps we should just do that. 1002 */ 1003 if (st->blkmin && (st->blkmin == st->blkmax)) { 1004 st->flags |= ST_FIXEDBLOCKS; 1005 st->blksize = st->blkmin; 1006 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 1007 ("blkmin == blkmax of %d\n", st->blkmin)); 1008 goto done; 1009 } 1010 /* 1011 * If the tape density mandates (or even suggests) use of fixed 1012 * or variable-length blocks, comply. 1013 */ 1014 switch (st->density) { 1015 case HALFINCH_800: 1016 case HALFINCH_1600: 1017 case HALFINCH_6250: 1018 case DDS: 1019 st->flags &= ~ST_FIXEDBLOCKS; 1020 st->blksize = 0; 1021 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 1022 ("density specified variable\n")); 1023 goto done; 1024 case QIC_11: 1025 case QIC_24: 1026 case QIC_120: 1027 case QIC_150: 1028 case QIC_525: 1029 case QIC_1320: 1030 case QIC_3095: 1031 case QIC_3220: 1032 st->flags |= ST_FIXEDBLOCKS; 1033 if (st->media_blksize > 0) 1034 st->blksize = st->media_blksize; 1035 else 1036 st->blksize = DEF_FIXED_BSIZE; 1037 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 1038 ("density specified fixed\n")); 1039 goto done; 1040 } 1041 /* 1042 * If we're about to read the tape, perhaps we should choose 1043 * fixed or variable-length blocks and block size according to 1044 * what the drive found on the tape. 1045 */ 1046 if (first_read && 1047 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 1048 (st->media_blksize == DEF_FIXED_BSIZE) || 1049 (st->media_blksize == 1024))) { 1050 if (st->media_blksize > 0) 1051 st->flags |= ST_FIXEDBLOCKS; 1052 else 1053 st->flags &= ~ST_FIXEDBLOCKS; 1054 st->blksize = st->media_blksize; 1055 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 1056 ("Used media_blksize of %d\n", st->media_blksize)); 1057 goto done; 1058 } 1059 /* 1060 * We're getting no hints from any direction. Choose variable- 1061 * length blocks arbitrarily. 1062 */ 1063 st->flags &= ~ST_FIXEDBLOCKS; 1064 st->blksize = 0; 1065 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 1066 ("Give up and default to variable mode\n")); 1067 1068done: 1069 /* 1070 * Decide whether or not to write two file marks to signify end- 1071 * of-data. Make the decision as a function of density. If 1072 * the decision is not to use a second file mark, the SCSI BLANK 1073 * CHECK condition code will be recognized as end-of-data when 1074 * first read. 1075 * (I think this should be a by-product of fixed/variable..julian) 1076 */ 1077 switch (st->density) { 1078/* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 1079 case QIC_11: 1080 case QIC_24: 1081 case QIC_120: 1082 case QIC_150: 1083 case QIC_525: 1084 case QIC_1320: 1085 case QIC_3095: 1086 case QIC_3220: 1087 st->flags &= ~ST_2FM_AT_EOD; 1088 break; 1089 default: 1090 st->flags |= ST_2FM_AT_EOD; 1091 } 1092 return 0; 1093} 1094 1095/* 1096 * Actually translate the requested transfer into 1097 * one the physical driver can understand 1098 * The transfer is described by a buf and will include 1099 * only one physical transfer. 1100 */ 1101static void 1102ststrategy(struct buf *bp) 1103{ 1104 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(bp->b_dev)); 1105 struct scsipi_periph *periph = st->sc_periph; 1106 struct scsipi_channel *chan = periph->periph_channel; 1107 1108 SC_DEBUG(periph, SCSIPI_DB1, 1109 ("ststrategy %d bytes @ blk %" PRId64 "\n", bp->b_bcount, 1110 bp->b_blkno)); 1111 /* If it's a null transfer, return immediately */ 1112 if (bp->b_bcount == 0) 1113 goto abort; 1114 1115 /* If offset is negative, error */ 1116 if (bp->b_blkno < 0) { 1117 SC_DEBUG(periph, SCSIPI_DB3, 1118 ("EINVAL: ststrategy negative blockcount %" PRId64 "\n", bp->b_blkno)); 1119 bp->b_error = EINVAL; 1120 goto abort; 1121 } 1122 1123 /* Odd sized request on fixed drives are verboten */ 1124 if (st->flags & ST_FIXEDBLOCKS) { 1125 if (bp->b_bcount % st->blksize) { 1126 aprint_error_dev(st->sc_dev, "bad request, must be multiple of %d\n", 1127 st->blksize); 1128 bp->b_error = EIO; 1129 goto abort; 1130 } 1131 } 1132 /* as are out-of-range requests on variable drives. */ 1133 else if (bp->b_bcount < st->blkmin || 1134 (st->blkmax && bp->b_bcount > st->blkmax)) { 1135 aprint_error_dev(st->sc_dev, "bad request, must be between %d and %d\n", 1136 st->blkmin, st->blkmax); 1137 bp->b_error = EIO; 1138 goto abort; 1139 } 1140 mutex_enter(chan_mtx(chan)); 1141 1142 /* 1143 * Place it in the queue of activities for this tape 1144 * at the end (a bit silly because we only have on user.. 1145 * (but it could fork())) 1146 */ 1147 bufq_put(st->buf_queue, bp); 1148 1149 /* 1150 * Tell the device to get going on the transfer if it's 1151 * not doing anything, otherwise just wait for completion 1152 * (All a bit silly if we're only allowing 1 open but..) 1153 */ 1154 ststart(periph); 1155 1156 mutex_exit(chan_mtx(chan)); 1157 return; 1158abort: 1159 /* 1160 * Reset the residue because we didn't do anything, 1161 * and send the buffer back as done. 1162 */ 1163 bp->b_resid = bp->b_bcount; 1164 biodone(bp); 1165 return; 1166} 1167 1168/* 1169 * ststart looks to see if there is a buf waiting for the device 1170 * and that the device is not already busy. If the device is busy, 1171 * the request is deferred and retried on the next attempt. 1172 * If both are true, ststart creates a scsi command to perform 1173 * the transfer required. 1174 * 1175 * The transfer request will call scsipi_done on completion, 1176 * which will in turn call this routine again so that the next 1177 * queued transfer is performed. The bufs are queued by the 1178 * strategy routine (ststrategy) 1179 * 1180 * This routine is also called after other non-queued requests 1181 * have been made of the scsi driver, to ensure that the queue 1182 * continues to be drained. 1183 * ststart() is called with channel lock held 1184 */ 1185static int 1186ststart1(struct scsipi_periph *periph, struct buf *bp, int *errnop) 1187{ 1188 struct st_softc *st = device_private(periph->periph_dev); 1189 struct scsipi_channel *chan = periph->periph_channel; 1190 struct scsi_rw_tape cmd; 1191 struct scsipi_xfer *xs; 1192 int flags, error, complete = 1; 1193 1194 SC_DEBUG(periph, SCSIPI_DB2, ("ststart1 ")); 1195 1196 mutex_enter(chan_mtx(chan)); 1197 1198 if (periph->periph_active >= periph->periph_openings) { 1199 error = EAGAIN; 1200 goto out; 1201 } 1202 1203 /* if a special awaits, let it proceed first */ 1204 if (periph->periph_flags & PERIPH_WAITING) { 1205 periph->periph_flags &= ~PERIPH_WAITING; 1206 cv_broadcast(periph_cv_periph(periph)); 1207 error = EAGAIN; 1208 goto out; 1209 } 1210 1211 /* 1212 * If the device has been unmounted by the user 1213 * then throw away all requests until done. 1214 */ 1215 if (__predict_false((st->flags & ST_MOUNTED) == 0 || 1216 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)) { 1217 error = EIO; 1218 goto out; 1219 } 1220 1221 /* 1222 * only FIXEDBLOCK devices have pending I/O or space operations. 1223 */ 1224 if (st->flags & ST_FIXEDBLOCKS) { 1225 /* 1226 * If we are at a filemark but have not reported it yet 1227 * then we should report it now 1228 */ 1229 if (st->flags & ST_AT_FILEMARK) { 1230 if ((bp->b_flags & B_READ) == B_WRITE) { 1231 /* 1232 * Handling of ST_AT_FILEMARK in 1233 * st_space will fill in the right file 1234 * mark count. 1235 * Back up over filemark 1236 */ 1237 if (st_space(st, 0, SP_FILEMARKS, 0)) { 1238 error = EIO; 1239 goto out; 1240 } 1241 } else { 1242 error = 0; 1243 st->flags &= ~ST_AT_FILEMARK; 1244 goto out; 1245 } 1246 } 1247 } 1248 /* 1249 * If we are at EOM but have not reported it 1250 * yet then we should report it now. 1251 */ 1252 if (st->flags & (ST_EOM_PENDING|ST_EIO_PENDING)) { 1253 error = 0; 1254 if (st->flags & ST_EIO_PENDING) 1255 error = EIO; 1256 st->flags &= ~(ST_EOM_PENDING|ST_EIO_PENDING); 1257 goto out; 1258 } 1259 1260 /* Fill out the scsi command */ 1261 memset(&cmd, 0, sizeof(cmd)); 1262 flags = XS_CTL_NOSLEEP | XS_CTL_ASYNC; 1263 if ((bp->b_flags & B_READ) == B_WRITE) { 1264 cmd.opcode = WRITE; 1265 st->flags &= ~ST_FM_WRITTEN; 1266 flags |= XS_CTL_DATA_OUT; 1267 } else { 1268 cmd.opcode = READ; 1269 flags |= XS_CTL_DATA_IN; 1270 } 1271 1272 /* 1273 * Handle "fixed-block-mode" tape drives by using the 1274 * block count instead of the length. 1275 */ 1276 if (st->flags & ST_FIXEDBLOCKS) { 1277 cmd.byte2 |= SRW_FIXED; 1278 _lto3b(bp->b_bcount / st->blksize, cmd.len); 1279 } else 1280 _lto3b(bp->b_bcount, cmd.len); 1281 1282 /* Clear 'position updated' indicator */ 1283 st->flags &= ~ST_POSUPDATED; 1284 1285 /* go ask the adapter to do all this for us */ 1286 xs = scsipi_make_xs_locked(periph, 1287 (struct scsipi_generic *)&cmd, sizeof(cmd), 1288 (u_char *)bp->b_data, bp->b_bcount, 1289 0, ST_IO_TIME, bp, flags); 1290 if (__predict_false(xs == NULL)) { 1291 /* 1292 * out of memory. Keep this buffer in the queue, and 1293 * retry later. 1294 */ 1295 callout_reset(&st->sc_callout, hz / 2, strestart, 1296 periph); 1297 error = EAGAIN; 1298 goto out; 1299 } 1300 1301 error = scsipi_execute_xs(xs); 1302 /* with a scsipi_xfer preallocated, scsipi_command can't fail */ 1303 KASSERT(error == 0); 1304 if (error == 0) 1305 complete = 0; 1306 1307out: 1308 mutex_exit(chan_mtx(chan)); 1309 1310 *errnop = error; 1311 return complete; 1312} 1313 1314static void 1315ststart(struct scsipi_periph *periph) 1316{ 1317 struct st_softc *st = device_private(periph->periph_dev); 1318 struct scsipi_channel *chan = periph->periph_channel; 1319 struct buf *bp; 1320 int error, complete; 1321 1322 SC_DEBUG(periph, SCSIPI_DB2, ("ststart ")); 1323 1324 mutex_exit(chan_mtx(chan)); 1325 mutex_enter(&st->sc_iolock); 1326 1327 while ((bp = bufq_get(st->buf_defer)) != NULL 1328 || (bp = bufq_get(st->buf_queue)) != NULL) { 1329 1330 iostat_busy(st->stats); 1331 mutex_exit(&st->sc_iolock); 1332 1333 complete = ststart1(periph, bp, &error); 1334 1335 mutex_enter(&st->sc_iolock); 1336 if (complete) { 1337 iostat_unbusy(st->stats, 0, 1338 ((bp->b_flags & B_READ) == B_READ)); 1339 if (error == EAGAIN) { 1340 bufq_put(st->buf_defer, bp); 1341 break; 1342 } 1343 } 1344 mutex_exit(&st->sc_iolock); 1345 1346 if (complete) { 1347 bp->b_error = error; 1348 bp->b_resid = bp->b_bcount; 1349 biodone(bp); 1350 } 1351 1352 mutex_enter(&st->sc_iolock); 1353 } 1354 1355 mutex_exit(&st->sc_iolock); 1356 mutex_enter(chan_mtx(chan)); 1357} 1358 1359static void 1360strestart(void *v) 1361{ 1362 struct scsipi_periph *periph = (struct scsipi_periph *)v; 1363 struct scsipi_channel *chan = periph->periph_channel; 1364 1365 mutex_enter(chan_mtx(chan)); 1366 ststart((struct scsipi_periph *)v); 1367 mutex_exit(chan_mtx(chan)); 1368} 1369 1370static void 1371stdone(struct scsipi_xfer *xs, int error) 1372{ 1373 struct st_softc *st = device_private(xs->xs_periph->periph_dev); 1374 struct buf *bp = xs->bp; 1375 1376 if (bp) { 1377 bp->b_error = error; 1378 bp->b_resid = xs->resid; 1379 /* 1380 * buggy device ? A SDLT320 can report an info 1381 * field of 0x3de8000 on a Media Error/Write Error 1382 * for this CBD: 0x0a 00 00 80 00 00 1383 */ 1384 if (bp->b_resid > bp->b_bcount || bp->b_resid < 0) 1385 bp->b_resid = bp->b_bcount; 1386 1387 mutex_enter(&st->sc_iolock); 1388 1389 if ((bp->b_flags & B_READ) == B_WRITE) 1390 st->flags |= ST_WRITTEN; 1391 else 1392 st->flags &= ~ST_WRITTEN; 1393 1394 iostat_unbusy(st->stats, bp->b_bcount, 1395 ((bp->b_flags & B_READ) == B_READ)); 1396 1397 if ((st->flags & ST_POSUPDATED) == 0) { 1398 if (error) { 1399 st->fileno = st->blkno = -1; 1400 } else if (st->blkno != -1) { 1401 if (st->flags & ST_FIXEDBLOCKS) 1402 st->blkno += 1403 (bp->b_bcount / st->blksize); 1404 else 1405 st->blkno++; 1406 } 1407 } 1408 1409 mutex_exit(&st->sc_iolock); 1410 1411 rnd_add_uint32(&st->rnd_source, bp->b_blkno); 1412 1413 biodone(bp); 1414 } 1415} 1416 1417static int 1418stread(dev_t dev, struct uio *uio, int iomode) 1419{ 1420 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev)); 1421 1422 int r = physio(ststrategy, NULL, dev, B_READ, 1423 st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio); 1424 1425 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[stread: result=%d]\n", r)); 1426 1427 return r; 1428} 1429 1430static int 1431stwrite(dev_t dev, struct uio *uio, int iomode) 1432{ 1433 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev)); 1434 1435 int r = physio(ststrategy, NULL, dev, B_WRITE, 1436 st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio); 1437 1438 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[stwrite: result=%d]\n", r)); 1439 1440 return r; 1441} 1442 1443/* 1444 * Perform special action on behalf of the user; 1445 * knows about the internals of this device 1446 */ 1447static int 1448stioctl(dev_t dev, u_long cmd, void *arg, int flag, struct lwp *l) 1449{ 1450 int error = 0; 1451 int unit; 1452 int number, nmarks, dsty; 1453 int flags; 1454 struct st_softc *st; 1455 int hold_blksize; 1456 uint8_t hold_density; 1457 struct mtop *mt = (struct mtop *) arg; 1458 1459 /* Find the device that the user is talking about */ 1460 flags = 0; /* give error messages, act on errors etc. */ 1461 unit = STUNIT(dev); 1462 dsty = STDSTY(dev); 1463 st = device_lookup_private(&st_cd, unit); 1464 hold_blksize = st->blksize; 1465 hold_density = st->density; 1466 1467 switch ((u_int)cmd) { 1468 case MTIOCGET: { 1469 struct mtget *g = (struct mtget *) arg; 1470 /* 1471 * (to get the current state of READONLY) 1472 */ 1473 error = st->ops(st, ST_OPS_MODESENSE, XS_CTL_SILENT); 1474 if (error) { 1475 /* 1476 * Ignore the error if in control mode; 1477 * this is mandated by st(4). 1478 */ 1479 if (STMODE(dev) != CTRL_MODE) 1480 break; 1481 error = 0; 1482 } 1483 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[ioctl: get status]\n")); 1484 memset(g, 0, sizeof(struct mtget)); 1485 g->mt_type = MT_ISAR; /* Ultrix compat *//*? */ 1486 g->mt_blksiz = st->blksize; 1487 g->mt_density = st->density; 1488 g->mt_mblksiz[0] = st->modes[0].blksize; 1489 g->mt_mblksiz[1] = st->modes[1].blksize; 1490 g->mt_mblksiz[2] = st->modes[2].blksize; 1491 g->mt_mblksiz[3] = st->modes[3].blksize; 1492 g->mt_mdensity[0] = st->modes[0].density; 1493 g->mt_mdensity[1] = st->modes[1].density; 1494 g->mt_mdensity[2] = st->modes[2].density; 1495 g->mt_mdensity[3] = st->modes[3].density; 1496 g->mt_fileno = st->fileno; 1497 g->mt_blkno = st->blkno; 1498 if (st->flags & ST_READONLY) 1499 g->mt_dsreg |= MT_DS_RDONLY; 1500 if (st->flags & ST_MOUNTED) 1501 g->mt_dsreg |= MT_DS_MOUNTED; 1502 g->mt_resid = st->mt_resid; 1503 g->mt_erreg = st->mt_erreg; 1504 /* 1505 * clear latched errors. 1506 */ 1507 st->mt_resid = 0; 1508 st->mt_erreg = 0; 1509 st->asc = 0; 1510 st->ascq = 0; 1511 break; 1512 } 1513 case MTIOCTOP: { 1514 SC_DEBUG(st->sc_periph, SCSIPI_DB1, 1515 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, 1516 mt->mt_count)); 1517 1518 /* compat: in U*x it is a short */ 1519 number = mt->mt_count; 1520 switch ((short) (mt->mt_op)) { 1521 case MTWEOF: /* write an end-of-file record */ 1522 error = st_write_filemarks(st, number, flags); 1523 break; 1524 case MTBSF: /* backward space file */ 1525 number = -number; 1526 /* FALLTHROUGH */ 1527 case MTFSF: /* forward space file */ 1528 error = st_check_eod(st, FALSE, &nmarks, flags); 1529 if (!error) 1530 error = st_space(st, number - nmarks, 1531 SP_FILEMARKS, flags); 1532 break; 1533 case MTBSR: /* backward space record */ 1534 number = -number; 1535 /* FALLTHROUGH */ 1536 case MTFSR: /* forward space record */ 1537 error = st_check_eod(st, true, &nmarks, flags); 1538 if (!error) 1539 error = st_space(st, number, SP_BLKS, flags); 1540 break; 1541 case MTREW: /* rewind */ 1542 error = st_rewind(st, 0, flags); 1543 break; 1544 case MTOFFL: /* rewind and put the drive offline */ 1545 st_unmount(st, EJECT); 1546 break; 1547 case MTNOP: /* no operation, sets status only */ 1548 break; 1549 case MTRETEN: /* retension the tape */ 1550 error = st_load(st, LD_RETENSION, flags); 1551 if (!error) 1552 error = st_load(st, LD_LOAD, flags); 1553 break; 1554 case MTEOM: /* forward space to end of media */ 1555 error = st_check_eod(st, FALSE, &nmarks, flags); 1556 if (!error) 1557 error = st_space(st, 1, SP_EOM, flags); 1558 break; 1559 case MTCACHE: /* enable controller cache */ 1560 st->flags &= ~ST_DONTBUFFER; 1561 goto try_new_value; 1562 case MTNOCACHE: /* disable controller cache */ 1563 st->flags |= ST_DONTBUFFER; 1564 goto try_new_value; 1565 case MTERASE: /* erase volume */ 1566 error = st_erase(st, number, flags); 1567 break; 1568 case MTSETBSIZ: /* Set block size for device */ 1569#ifdef NOTYET 1570 if (!(st->flags & ST_NEW_MOUNT)) { 1571 uprintf("re-mount tape before changing " 1572 "blocksize"); 1573 error = EINVAL; 1574 break; 1575 } 1576#endif 1577 if (number == 0) 1578 st->flags &= ~ST_FIXEDBLOCKS; 1579 else { 1580 if ((st->blkmin || st->blkmax) && 1581 (number < st->blkmin || 1582 number > st->blkmax)) { 1583 error = EINVAL; 1584 break; 1585 } 1586 st->flags |= ST_FIXEDBLOCKS; 1587 } 1588 st->blksize = number; 1589 st->flags |= ST_BLOCK_SET; /*XXX */ 1590 goto try_new_value; 1591 case MTSETDNSTY: /* Set density for device and mode */ 1592 /* 1593 * Any number >= 0 and <= 0xff is legal. Numbers 1594 * above 0x80 are 'vendor unique'. 1595 */ 1596 if (number < 0 || number > 255) { 1597 error = EINVAL; 1598 break; 1599 } else 1600 st->density = number; 1601 goto try_new_value; 1602 case MTCMPRESS: 1603 error = st->ops(st, (number == 0) ? 1604 ST_OPS_CMPRSS_OFF : ST_OPS_CMPRSS_ON, 1605 XS_CTL_SILENT); 1606 break; 1607 case MTEWARN: 1608 if (number) 1609 st->flags |= ST_EARLYWARN; 1610 else 1611 st->flags &= ~ST_EARLYWARN; 1612 break; 1613 1614 default: 1615 error = EINVAL; 1616 } 1617 break; 1618 } 1619 case MTIOCIEOT: 1620 case MTIOCEEOT: 1621 break; 1622 case MTIOCRDSPOS: 1623 error = st_rdpos(st, 0, (uint32_t *)arg); 1624 break; 1625 case MTIOCRDHPOS: 1626 error = st_rdpos(st, 1, (uint32_t *)arg); 1627 break; 1628 case MTIOCSLOCATE: 1629 error = st_setpos(st, 0, (uint32_t *)arg); 1630 break; 1631 case MTIOCHLOCATE: 1632 error = st_setpos(st, 1, (uint32_t *)arg); 1633 break; 1634 default: 1635 error = scsipi_do_ioctl(st->sc_periph, dev, cmd, arg, flag, l); 1636 break; 1637 } 1638 return error; 1639 1640try_new_value: 1641 /* 1642 * Check that the mode being asked for is aggreeable to the 1643 * drive. If not, put it back the way it was. 1644 * 1645 * If in control mode, we can make (persistent) mode changes 1646 * even if no medium is loaded (see st(4)). 1647 */ 1648 if ((STMODE(dev) != CTRL_MODE || (st->flags & ST_MOUNTED) != 0) && 1649 (error = st->ops(st, ST_OPS_MODESELECT, 0)) != 0) { 1650 /* put it back as it was */ 1651 aprint_error_dev(st->sc_dev, "cannot set selected mode\n"); 1652 st->density = hold_density; 1653 st->blksize = hold_blksize; 1654 if (st->blksize) 1655 st->flags |= ST_FIXEDBLOCKS; 1656 else 1657 st->flags &= ~ST_FIXEDBLOCKS; 1658 return error; 1659 } 1660 /* 1661 * As the drive liked it, if we are setting a new default, 1662 * set it into the structures as such. 1663 * 1664 * The means for deciding this are not finalised yet- but 1665 * if the device was opened in Control Mode, the values 1666 * are persistent now across mounts. 1667 */ 1668 if (STMODE(dev) == CTRL_MODE) { 1669 switch ((short) (mt->mt_op)) { 1670 case MTSETBSIZ: 1671 st->modes[dsty].blksize = st->blksize; 1672 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1673 break; 1674 case MTSETDNSTY: 1675 st->modes[dsty].density = st->density; 1676 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1677 break; 1678 } 1679 } 1680 return 0; 1681} 1682 1683/* Do a synchronous read. */ 1684static int 1685st_read(struct st_softc *st, char *bf, int size, int flags) 1686{ 1687 struct scsi_rw_tape cmd; 1688 1689 /* If it's a null transfer, return immediately */ 1690 if (size == 0) 1691 return 0; 1692 memset(&cmd, 0, sizeof(cmd)); 1693 cmd.opcode = READ; 1694 if (st->flags & ST_FIXEDBLOCKS) { 1695 cmd.byte2 |= SRW_FIXED; 1696 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1697 cmd.len); 1698 } else 1699 _lto3b(size, cmd.len); 1700 return scsipi_command(st->sc_periph, 1701 (void *)&cmd, sizeof(cmd), (void *)bf, size, 0, ST_IO_TIME, NULL, 1702 flags | XS_CTL_DATA_IN); 1703} 1704 1705/* issue an erase command */ 1706static int 1707st_erase(struct st_softc *st, int full, int flags) 1708{ 1709 int tmo; 1710 struct scsi_erase cmd; 1711 1712 /* 1713 * Full erase means set LONG bit in erase command, which asks 1714 * the drive to erase the entire unit. Without this bit, we're 1715 * asking the drive to write an erase gap. 1716 */ 1717 memset(&cmd, 0, sizeof(cmd)); 1718 cmd.opcode = ERASE; 1719 if (full) { 1720 cmd.byte2 = SE_LONG; 1721 tmo = ST_SPC_TIME; 1722 } else 1723 tmo = ST_IO_TIME; 1724 1725 /* 1726 * XXX We always do this asynchronously, for now, unless the device 1727 * has the ST_Q_ERASE_NOIMM quirk. How long should we wait if we 1728 * want to (eventually) to it synchronously? 1729 */ 1730 if ((st->quirks & ST_Q_ERASE_NOIMM) == 0) 1731 cmd.byte2 |= SE_IMMED; 1732 1733 return scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 1734 ST_RETRIES, tmo, NULL, flags); 1735} 1736 1737/* skip N blocks/filemarks/seq filemarks/eom */ 1738static int 1739st_space(struct st_softc *st, int number, u_int what, int flags) 1740{ 1741 struct scsi_space cmd; 1742 int error; 1743 1744 switch (what) { 1745 case SP_BLKS: 1746 if (st->flags & ST_PER_ACTION) { 1747 if (number > 0) { 1748 st->flags &= ~ST_PER_ACTION; 1749 return EIO; 1750 } else if (number < 0) { 1751 if (st->flags & ST_AT_FILEMARK) { 1752 /* 1753 * Handling of ST_AT_FILEMARK 1754 * in st_space will fill in the 1755 * right file mark count. 1756 */ 1757 error = st_space(st, 0, SP_FILEMARKS, 1758 flags); 1759 if (error) 1760 return error; 1761 } 1762 if (st->flags & ST_BLANK_READ) { 1763 st->flags &= ~ST_BLANK_READ; 1764 return EIO; 1765 } 1766 st->flags &= ~(ST_EIO_PENDING|ST_EOM_PENDING); 1767 } 1768 } 1769 break; 1770 case SP_FILEMARKS: 1771 if (st->flags & ST_EIO_PENDING) { 1772 if (number > 0) { 1773 /* pretend we just discovered the error */ 1774 st->flags &= ~ST_EIO_PENDING; 1775 return EIO; 1776 } else if (number < 0) { 1777 /* back away from the error */ 1778 st->flags &= ~ST_EIO_PENDING; 1779 } 1780 } 1781 if (st->flags & ST_AT_FILEMARK) { 1782 st->flags &= ~ST_AT_FILEMARK; 1783 number--; 1784 } 1785 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1786 /* back away from unwritten tape */ 1787 st->flags &= ~ST_BLANK_READ; 1788 number++; /* XXX dubious */ 1789 } 1790 break; 1791 case SP_EOM: 1792 if (st->flags & ST_EOM_PENDING) { 1793 /* we're already there */ 1794 st->flags &= ~ST_EOM_PENDING; 1795 return 0; 1796 } 1797 if (st->flags & ST_EIO_PENDING) { 1798 /* pretend we just discovered the error */ 1799 st->flags &= ~ST_EIO_PENDING; 1800 return EIO; 1801 } 1802 if (st->flags & ST_AT_FILEMARK) 1803 st->flags &= ~ST_AT_FILEMARK; 1804 break; 1805 } 1806 if (number == 0) 1807 return 0; 1808 1809 memset(&cmd, 0, sizeof(cmd)); 1810 cmd.opcode = SPACE; 1811 cmd.byte2 = what; 1812 _lto3b(number, cmd.number); 1813 1814 st->flags &= ~ST_POSUPDATED; 1815 st->last_ctl_resid = 0; 1816 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 1817 0, ST_SPC_TIME, NULL, flags); 1818 1819 if (error == 0 && (st->flags & ST_POSUPDATED) == 0) { 1820 number = number - st->last_ctl_resid; 1821 if (what == SP_BLKS) { 1822 if (st->blkno != -1) 1823 st->blkno += number; 1824 } else if (what == SP_FILEMARKS) { 1825 if (st->fileno != -1) { 1826 st->fileno += number; 1827 if (number > 0) 1828 st->blkno = 0; 1829 else if (number < 0) 1830 st->blkno = -1; 1831 } 1832 } else if (what == SP_EOM) { 1833 st_updatefilepos(st); 1834 } 1835 } 1836 return error; 1837} 1838 1839/* 1840 * write N filemarks 1841 */ 1842static int 1843st_write_filemarks(struct st_softc *st, int number, int flags) 1844{ 1845 int error; 1846 struct scsi_write_filemarks cmd; 1847 1848 /* 1849 * It's hard to write a negative number of file marks. 1850 * Don't try. 1851 */ 1852 if (number < 0) { 1853 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 1854 ("EINVAL: st_write_filemarks not writing %d file marks\n", number)); 1855 return EINVAL; 1856 } 1857 1858 switch (number) { 1859 case 0: /* really a command to sync the drive's buffers */ 1860 break; 1861 case 1: 1862 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1863 st->flags &= ~ST_WRITTEN; 1864 else 1865 st->flags |= ST_FM_WRITTEN; 1866 st->flags &= ~ST_PER_ACTION; 1867 break; 1868 default: 1869 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1870 } 1871 1872 memset(&cmd, 0, sizeof(cmd)); 1873 cmd.opcode = WRITE_FILEMARKS; 1874 if (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(st->sc_periph)) == 1875 SCSIPI_BUSTYPE_ATAPI) 1876 cmd.byte2 = SR_IMMED; 1877 /* 1878 * The ATAPI Onstream DI-30 doesn't support writing filemarks, but 1879 * WRITE_FILEMARKS is still used to flush the buffer 1880 */ 1881 if ((st->quirks & ST_Q_NOFILEMARKS) == 0) 1882 _lto3b(number, cmd.number); 1883 1884 /* XXX WE NEED TO BE ABLE TO GET A RESIDIUAL XXX */ 1885 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 1886 0, ST_IO_TIME * 4, NULL, flags); 1887 if (error == 0 && st->fileno != -1) 1888 st->fileno += number; 1889 return error; 1890} 1891 1892/* 1893 * Make sure the right number of file marks is on tape if the 1894 * tape has been written. If the position argument is true, 1895 * leave the tape positioned where it was originally. 1896 * 1897 * nmarks returns the number of marks to skip (or, if position 1898 * true, which were skipped) to get back original position. 1899 */ 1900static int 1901st_check_eod(struct st_softc *st, boolean position, int *nmarks, int flags) 1902{ 1903 int error; 1904 1905 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1906 default: 1907 *nmarks = 0; 1908 return 0; 1909 case ST_WRITTEN: 1910 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1911 *nmarks = 1; 1912 break; 1913 case ST_WRITTEN | ST_2FM_AT_EOD: 1914 *nmarks = 2; 1915 } 1916 error = st_write_filemarks(st, *nmarks, flags); 1917 if (position && !error) 1918 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1919 return error; 1920} 1921 1922/* load/unload/retension */ 1923static int 1924st_load(struct st_softc *st, u_int type, int flags) 1925{ 1926 int error; 1927 struct scsi_load cmd; 1928 1929 if (type != LD_LOAD) { 1930 int nmarks; 1931 1932 error = st_check_eod(st, FALSE, &nmarks, flags); 1933 if (error) { 1934 aprint_error_dev(st->sc_dev, 1935 "failed to write closing filemarks at " 1936 "unload, errno=%d\n", error); 1937 return error; 1938 } 1939 } 1940 if (st->quirks & ST_Q_IGNORE_LOADS) { 1941 if (type == LD_LOAD) 1942 /* 1943 * If we ignore loads, at least we should try a rewind. 1944 */ 1945 return st_rewind(st, 0, flags); 1946 /* otherwise, we should do what's asked of us */ 1947 } 1948 1949 memset(&cmd, 0, sizeof(cmd)); 1950 cmd.opcode = LOAD; 1951 if (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(st->sc_periph)) == 1952 SCSIPI_BUSTYPE_ATAPI) 1953 cmd.byte2 = SR_IMMED; 1954 cmd.how = type; 1955 1956 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 1957 ST_RETRIES, ST_SPC_TIME, NULL, flags); 1958 if (error) { 1959 aprint_error_dev(st->sc_dev, "error %d in st_load (op %d)\n", 1960 error, type); 1961 } 1962 return error; 1963} 1964 1965/* Rewind the device */ 1966static int 1967st_rewind(struct st_softc *st, u_int immediate, int flags) 1968{ 1969 struct scsi_rewind cmd; 1970 int error; 1971 int nmarks; 1972 int timeout; 1973 1974 error = st_check_eod(st, FALSE, &nmarks, flags); 1975 if (error) { 1976 aprint_error_dev(st->sc_dev, 1977 "failed to write closing filemarks at " 1978 "rewind, errno=%d\n", error); 1979 return error; 1980 } 1981 st->flags &= ~ST_PER_ACTION; 1982 1983 /* If requestor asked for immediate response, set a short timeout */ 1984 timeout = immediate ? ST_CTL_TIME : ST_SPC_TIME; 1985 1986 /* ATAPI tapes always need immediate to be set */ 1987 if (scsipi_periph_bustype(st->sc_periph) == SCSIPI_BUSTYPE_ATAPI) 1988 immediate = SR_IMMED; 1989 1990 memset(&cmd, 0, sizeof(cmd)); 1991 cmd.opcode = REWIND; 1992 cmd.byte2 = immediate; 1993 1994 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 1995 ST_RETRIES, timeout, NULL, flags); 1996 if (error) { 1997 aprint_error_dev(st->sc_dev, "error %d trying to rewind\n", 1998 error); 1999 /* lost position */ 2000 st->fileno = st->blkno = -1; 2001 } else 2002 st->fileno = st->blkno = 0; 2003 return error; 2004} 2005 2006static void 2007st_updatefilepos(struct st_softc *st) 2008{ 2009 int error; 2010 uint8_t posdata[32]; 2011 struct scsi_tape_read_position cmd; 2012 2013 memset(&cmd, 0, sizeof(cmd)); 2014 memset(&posdata, 0, sizeof(posdata)); 2015 cmd.opcode = READ_POSITION; 2016 cmd.byte1 = 6; /* service action: LONG FORM */ 2017 2018 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 2019 (void *)&posdata, sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL, 2020 XS_CTL_SILENT | XS_CTL_DATA_IN); 2021 2022 if (error == 0) { 2023#ifdef SCSIPI_DEBUG 2024 if (st->sc_periph->periph_dbflags & SCSIPI_DB3) { 2025 int hard; 2026 2027 printf("posdata: "); 2028 for (hard = 0; hard < sizeof(posdata); hard++) 2029 printf("%02x ", posdata[hard] & 0xff); 2030 printf("\n"); 2031 } 2032#endif 2033 if (posdata[0] & 0xC) { /* Block|Mark Position Unknown */ 2034 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 2035 ("st_updatefilepos block/mark position unknown (0x%02x)\n", 2036 posdata[0])); 2037 } else { 2038 st->fileno = _8btol(&posdata[16]); 2039 st->blkno = 0; 2040 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 2041 ("st_updatefilepos file position %"PRId64"\n", 2042 st->fileno)); 2043 return; 2044 } 2045 } else { 2046 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 2047 ("st_updatefilepos READ POSITION(LONG_FORM) failed (error=%d)\n", 2048 error)); 2049 } 2050 st->fileno = -1; 2051 st->blkno = -1; 2052} 2053 2054static int 2055st_rdpos(struct st_softc *st, int hard, uint32_t *blkptr) 2056{ 2057 int error; 2058 uint8_t posdata[20]; 2059 struct scsi_tape_read_position cmd; 2060 2061 /* 2062 * We try and flush any buffered writes here if we were writing 2063 * and we're trying to get hardware block position. It eats 2064 * up performance substantially, but I'm wary of drive firmware. 2065 * 2066 * I think that *logical* block position is probably okay- 2067 * but hardware block position might have to wait for data 2068 * to hit media to be valid. Caveat Emptor. 2069 */ 2070 2071 if (hard && (st->flags & ST_WRITTEN)) { 2072 /* First flush any pending writes... */ 2073 error = st_write_filemarks(st, 0, XS_CTL_SILENT); 2074 /* 2075 * The latter case is for 'write protected' tapes 2076 * which are too stupid to recognize a zero count 2077 * for writing filemarks as a no-op. 2078 */ 2079 if (error != 0 && error != EACCES && error != EROFS) 2080 return error; 2081 } 2082 2083 memset(&cmd, 0, sizeof(cmd)); 2084 memset(&posdata, 0, sizeof(posdata)); 2085 cmd.opcode = READ_POSITION; 2086 if (hard) 2087 cmd.byte1 = 1; 2088 2089 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 2090 (void *)&posdata, sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL, 2091 XS_CTL_SILENT | XS_CTL_DATA_IN); 2092 2093 if (error == 0) { 2094#if 0 2095 printf("posdata:"); 2096 for (hard = 0; hard < sizeof(posdata); hard++) 2097 printf("%02x ", posdata[hard] & 0xff); 2098 printf("\n"); 2099#endif 2100 if (posdata[0] & 0x4) { /* Block Position Unknown */ 2101 SC_DEBUG(st->sc_periph, SCSIPI_DB3, 2102 ("EINVAL: strdpos block position unknown\n")); 2103 error = EINVAL; 2104 } 2105 else 2106 *blkptr = _4btol(&posdata[4]); 2107 } 2108 return error; 2109} 2110 2111static int 2112st_setpos(struct st_softc *st, int hard, uint32_t *blkptr) 2113{ 2114 int error; 2115 struct scsi_tape_locate cmd; 2116 2117 /* 2118 * We used to try and flush any buffered writes here. 2119 * Now we push this onto user applications to either 2120 * flush the pending writes themselves (via a zero count 2121 * WRITE FILEMARKS command) or they can trust their tape 2122 * drive to do this correctly for them. 2123 * 2124 * There are very ugly performance limitations otherwise. 2125 */ 2126 2127 memset(&cmd, 0, sizeof(cmd)); 2128 cmd.opcode = LOCATE; 2129 if (hard) 2130 cmd.byte2 = 1 << 2; 2131 _lto4b(*blkptr, cmd.blkaddr); 2132 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 2133 ST_RETRIES, ST_SPC_TIME, NULL, 0); 2134 /* 2135 * Note file && block number position now unknown (if 2136 * these things ever start being maintained in this driver) 2137 */ 2138 st->fileno = st->blkno = -1; 2139 return error; 2140} 2141 2142 2143/* 2144 * Look at the returned sense and act on the error and determine 2145 * the unix error number to pass back..., 0 (== report no error), 2146 * -1 = retry the operation, -2 continue error processing. 2147 */ 2148static int 2149st_interpret_sense(struct scsipi_xfer *xs) 2150{ 2151 struct scsipi_periph *periph = xs->xs_periph; 2152 struct scsi_sense_data *sense = &xs->sense.scsi_sense; 2153 struct buf *bp = xs->bp; 2154 struct st_softc *st = device_private(periph->periph_dev); 2155 int retval = EJUSTRETURN; 2156 int doprint = ((xs->xs_control & XS_CTL_SILENT) == 0); 2157 uint8_t key; 2158 int32_t info; 2159 2160 /* 2161 * If it isn't a extended or extended/deferred error, let 2162 * the generic code handle it. 2163 */ 2164 if (SSD_RCODE(sense->response_code) != SSD_RCODE_CURRENT && 2165 SSD_RCODE(sense->response_code) != SSD_RCODE_DEFERRED) 2166 return retval; 2167 2168 if (sense->response_code & SSD_RCODE_VALID) 2169 info = _4btol(sense->info); 2170 else 2171 info = (st->flags & ST_FIXEDBLOCKS) ? 2172 xs->datalen / st->blksize : xs->datalen; 2173 key = SSD_SENSE_KEY(sense->flags); 2174 st->mt_erreg = key; 2175 st->asc = sense->asc; 2176 st->ascq = sense->ascq; 2177 st->mt_resid = (short) info; 2178 2179 if (key == SKEY_NOT_READY && st->asc == 0x4 && st->ascq == 0x1) { 2180 /* Not Ready, Logical Unit Is in Process Of Becoming Ready */ 2181 if (!callout_pending(&periph->periph_callout)) 2182 scsipi_periph_freeze(periph, 1); 2183 callout_reset(&periph->periph_callout, 2184 hz, scsipi_periph_timed_thaw, periph); 2185 return ERESTART; 2186 } 2187 2188 /* If the device is not open yet, let generic handle */ 2189 if ((periph->periph_flags & PERIPH_OPEN) == 0) 2190 return retval; 2191 2192 xs->resid = info; 2193 if (st->flags & ST_FIXEDBLOCKS) { 2194 if (bp) { 2195 xs->resid *= st->blksize; 2196 st->last_io_resid = xs->resid; 2197 } else 2198 st->last_ctl_resid = xs->resid; 2199 if (key == SKEY_VOLUME_OVERFLOW) { 2200 st->flags |= ST_EIO_PENDING; 2201 if (bp) 2202 bp->b_resid = xs->resid; 2203 } else if (sense->flags & SSD_EOM) { 2204 if ((st->flags & ST_EARLYWARN) == 0) 2205 st->flags |= ST_EIO_PENDING; 2206 st->flags |= ST_EOM_PENDING; 2207 if (bp) { 2208#if 0 2209 bp->b_resid = xs->resid; 2210#else 2211 /* 2212 * Grotesque as it seems, the few times 2213 * I've actually seen a non-zero resid, 2214 * the tape drive actually lied and had 2215 * written all the data! 2216 */ 2217 bp->b_resid = 0; 2218#endif 2219 } 2220 } 2221 if (sense->flags & SSD_FILEMARK) { 2222 st->flags |= ST_AT_FILEMARK; 2223 if (bp) 2224 bp->b_resid = xs->resid; 2225 if (st->fileno != (daddr_t) -1) { 2226 st->fileno++; 2227 st->blkno = 0; 2228 st->flags |= ST_POSUPDATED; 2229 } 2230 } 2231 if (sense->flags & SSD_ILI) { 2232 st->flags |= ST_EIO_PENDING; 2233 if (bp) 2234 bp->b_resid = xs->resid; 2235 if (sense->response_code & SSD_RCODE_VALID && 2236 (xs->xs_control & XS_CTL_SILENT) == 0) 2237 aprint_error_dev(st->sc_dev, 2238 "block wrong size, %d blocks residual\n", 2239 info); 2240 2241 /* 2242 * This quirk code helps the drive read 2243 * the first tape block, regardless of 2244 * format. That is required for these 2245 * drives to return proper MODE SENSE 2246 * information. 2247 */ 2248 if ((st->quirks & ST_Q_SENSE_HELP) && 2249 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) 2250 st->blksize -= 512; 2251 else if ((st->flags & ST_POSUPDATED) == 0) { 2252 if (st->blkno != (daddr_t) -1) { 2253 st->blkno += 2254 (xs->datalen / st->blksize); 2255 st->flags |= ST_POSUPDATED; 2256 } 2257 } 2258 } 2259 /* 2260 * If data wanted and no data was transferred, do it immediately 2261 */ 2262 if (xs->datalen && xs->resid >= xs->datalen) { 2263 if (st->flags & ST_EIO_PENDING) 2264 return EIO; 2265 if (st->flags & ST_AT_FILEMARK) { 2266 if (bp) 2267 bp->b_resid = xs->resid; 2268 return 0; 2269 } 2270 } 2271 } else { /* must be variable mode */ 2272 if (bp) 2273 st->last_io_resid = xs->resid; 2274 else 2275 st->last_ctl_resid = xs->resid; 2276 if (sense->flags & SSD_EOM) { 2277 /* 2278 * The current semantics of this 2279 * driver requires EOM detection 2280 * to return EIO unless early 2281 * warning detection is enabled 2282 * for variable mode (this is always 2283 * on for fixed block mode). 2284 */ 2285 if (st->flags & ST_EARLYWARN) { 2286 st->flags |= ST_EOM_PENDING; 2287 retval = 0; 2288 } else { 2289 retval = EIO; 2290 /* 2291 * If we return an error we can't claim to 2292 * have transferred all data. 2293 */ 2294 if (xs->resid == 0) 2295 xs->resid = xs->datalen; 2296 } 2297 2298 /* 2299 * If it's an unadorned EOM detection, 2300 * suppress printing an error. 2301 */ 2302 if (key == SKEY_NO_SENSE) { 2303 doprint = 0; 2304 } 2305 } else if (sense->flags & SSD_FILEMARK) { 2306 retval = 0; 2307 if (st->fileno != (daddr_t) -1) { 2308 st->fileno++; 2309 st->blkno = 0; 2310 st->flags |= ST_POSUPDATED; 2311 } 2312 } else if (sense->flags & SSD_ILI) { 2313 if (info < 0) { 2314 /* 2315 * The tape record was bigger than the read 2316 * we issued. 2317 */ 2318 if ((xs->xs_control & XS_CTL_SILENT) == 0) { 2319 aprint_error_dev(st->sc_dev, 2320 "%d-byte tape record too big" 2321 " for %d-byte user buffer\n", 2322 xs->datalen - info, xs->datalen); 2323 } 2324 retval = EIO; 2325 } else { 2326 retval = 0; 2327 if (st->blkno != (daddr_t) -1) { 2328 st->blkno++; 2329 st->flags |= ST_POSUPDATED; 2330 } 2331 } 2332 } 2333 if (bp) 2334 bp->b_resid = xs->resid; 2335 } 2336 2337#ifndef SCSIPI_DEBUG 2338 if (retval == 0 && key == SKEY_NO_SENSE) 2339 doprint = 0; 2340#endif 2341 if (key == SKEY_BLANK_CHECK) { 2342 /* 2343 * This quirk code helps the drive read the 2344 * first tape block, regardless of format. That 2345 * is required for these drives to return proper 2346 * MODE SENSE information. 2347 */ 2348 if ((st->quirks & ST_Q_SENSE_HELP) && 2349 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) { 2350 /* still starting */ 2351 st->blksize -= 512; 2352 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 2353 st->flags |= ST_BLANK_READ; 2354 xs->resid = xs->datalen; 2355 if (bp) { 2356 bp->b_resid = xs->resid; 2357 /* return an EOF */ 2358 } 2359 retval = 0; 2360 /* lost position */ 2361 st->fileno = st->blkno = -1; 2362 } 2363 } 2364 2365 /* 2366 * If generic sense processing will continue, we should not 2367 * print sense info here. 2368 */ 2369 if (retval == EJUSTRETURN) 2370 doprint = 0; 2371 2372 if (doprint) { 2373 /* Print verbose sense info if possible */ 2374 if (scsipi_print_sense(xs, 0) != 0) 2375 return retval; 2376 2377 /* Print less-verbose sense info */ 2378 scsipi_printaddr(periph); 2379 printf("Sense Key 0x%02x", key); 2380 if ((sense->response_code & SSD_RCODE_VALID) != 0) { 2381 switch (key) { 2382 case SKEY_NOT_READY: 2383 case SKEY_ILLEGAL_REQUEST: 2384 case SKEY_UNIT_ATTENTION: 2385 case SKEY_DATA_PROTECT: 2386 break; 2387 case SKEY_VOLUME_OVERFLOW: 2388 case SKEY_BLANK_CHECK: 2389 printf(", requested size: %d (decimal)", info); 2390 break; 2391 case SKEY_ABORTED_COMMAND: 2392 if (xs->xs_retries) 2393 printf(", retrying"); 2394 printf(", cmd 0x%x, info 0x%x", 2395 xs->cmd->opcode, info); 2396 break; 2397 default: 2398 printf(", info = %d (decimal)", info); 2399 } 2400 } 2401 if (sense->extra_len != 0) { 2402 int n; 2403 printf(", data ="); 2404 for (n = 0; n < sense->extra_len; n++) 2405 printf(" %02x", sense->csi[n]); 2406 } 2407 printf("\n"); 2408 } 2409 return retval; 2410} 2411 2412/* 2413 * The quirk here is that the drive returns some value to st_mode_sense 2414 * incorrectly until the tape has actually passed by the head. 2415 * 2416 * The method is to set the drive to large fixed-block state (user-specified 2417 * density and 1024-byte blocks), then read and rewind to get it to sense the 2418 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 2419 * work, as a last resort, try variable- length blocks. The result will be 2420 * the ability to do an accurate st_mode_sense. 2421 * 2422 * We know we can do a rewind because we just did a load, which implies rewind. 2423 * Rewind seems preferable to space backward if we have a virgin tape. 2424 * 2425 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 2426 * error processing, both part of st_interpret_sense. 2427 */ 2428static int 2429st_touch_tape(struct st_softc *st) 2430{ 2431 char *bf; 2432 int readsize; 2433 int error; 2434 2435 bf = malloc(1024, M_TEMP, M_WAITOK); 2436 if ((error = st->ops(st, ST_OPS_MODESENSE, 0)) != 0) 2437 goto bad; 2438 2439 /* 2440 * If the block size is already known from the 2441 * sense data, use it. Else start probing at 1024. 2442 */ 2443 if (st->media_blksize > 0) 2444 st->blksize = st->media_blksize; 2445 else 2446 st->blksize = 1024; 2447 2448 do { 2449 switch (st->blksize) { 2450 case 512: 2451 case 1024: 2452 readsize = st->blksize; 2453 st->flags |= ST_FIXEDBLOCKS; 2454 break; 2455 default: 2456 readsize = 1; 2457 st->flags &= ~ST_FIXEDBLOCKS; 2458 } 2459 if ((error = st->ops(st, ST_OPS_MODESELECT, XS_CTL_SILENT)) 2460 != 0) { 2461 /* 2462 * The device did not agree with the proposed 2463 * block size. If we exhausted our options, 2464 * return failure, else try another. 2465 */ 2466 if (readsize == 1) 2467 goto bad; 2468 st->blksize -= 512; 2469 continue; 2470 } 2471 st_read(st, bf, readsize, XS_CTL_SILENT); /* XXX */ 2472 if ((error = st_rewind(st, 0, 0)) != 0) { 2473bad: free(bf, M_TEMP); 2474 return error; 2475 } 2476 } while (readsize != 1 && readsize > st->blksize); 2477 2478 free(bf, M_TEMP); 2479 return 0; 2480} 2481 2482static int 2483stdump(dev_t dev, daddr_t blkno, void *va, size_t size) 2484{ 2485 /* Not implemented. */ 2486 return ENXIO; 2487} 2488 2489/* 2490 * Send a filled out parameter structure to the drive to 2491 * set it into the desire modes etc. 2492 */ 2493int 2494st_mode_select(struct st_softc *st, int flags) 2495{ 2496 u_int select_len; 2497 struct select { 2498 struct scsi_mode_parameter_header_6 header; 2499 struct scsi_general_block_descriptor blk_desc; 2500 u_char sense_data[MAX_PAGE_0_SIZE]; 2501 } select; 2502 struct scsipi_periph *periph = st->sc_periph; 2503 2504 select_len = sizeof(select.header) + sizeof(select.blk_desc) + 2505 st->page_0_size; 2506 2507 /* 2508 * This quirk deals with drives that have only one valid mode 2509 * and think this gives them license to reject all mode selects, 2510 * even if the selected mode is the one that is supported. 2511 */ 2512 if (st->quirks & ST_Q_UNIMODAL) { 2513 SC_DEBUG(periph, SCSIPI_DB3, 2514 ("not setting density 0x%x blksize 0x%x\n", 2515 st->density, st->blksize)); 2516 return 0; 2517 } 2518 2519 /* Set up for a mode select */ 2520 memset(&select, 0, sizeof(select)); 2521 select.header.blk_desc_len = sizeof(struct 2522 scsi_general_block_descriptor); 2523 select.header.dev_spec &= ~SMH_DSP_BUFF_MODE; 2524 select.blk_desc.density = st->density; 2525 if (st->flags & ST_DONTBUFFER) 2526 select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF; 2527 else 2528 select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 2529 if (st->flags & ST_FIXEDBLOCKS) 2530 _lto3b(st->blksize, select.blk_desc.blklen); 2531 if (st->page_0_size) 2532 memcpy(select.sense_data, st->sense_data, st->page_0_size); 2533 2534 /* do the command */ 2535 return scsipi_mode_select(periph, 0, &select.header, select_len, 2536 flags, ST_RETRIES, ST_CTL_TIME); 2537} 2538