1 /* $NetBSD: st.c,v 1.133 2000/11/22 00:32:24 soren Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Originally written by Julian Elischer (julian@tfs.com) 41 * for TRW Financial Systems for use under the MACH(2.5) operating system. 42 * 43 * TRW Financial Systems, in accordance with their agreement with Carnegie 44 * Mellon University, makes this software available to CMU to distribute 45 * or use in any manner that they see fit as long as this message is kept with 46 * the software. For this reason TFS also grants any other persons or 47 * organisations permission to use or modify this software. 48 * 49 * TFS supplies this software to be publicly redistributed 50 * on the understanding that TFS is not responsible for the correct 51 * functioning of this software in any circumstances. 52 * 53 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 54 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993 55 * 56 * A lot of rewhacking done by mjacob (mjacob@nas.nasa.gov). 57 */ 58 59 #include "opt_scsi.h" 60 #include "rnd.h" 61 62 #include <sys/types.h> 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/fcntl.h> 66 #include <sys/errno.h> 67 #include <sys/ioctl.h> 68 #include <sys/malloc.h> 69 #include <sys/buf.h> 70 #include <sys/proc.h> 71 #include <sys/user.h> 72 #include <sys/mtio.h> 73 #include <sys/device.h> 74 #include <sys/conf.h> 75 #include <sys/kernel.h> 76 #if NRND > 0 77 #include <sys/rnd.h> 78 #endif 79 80 #include <dev/scsipi/scsipi_all.h> 81 #include <dev/scsipi/scsi_all.h> 82 #include <dev/scsipi/scsi_tape.h> 83 #include <dev/scsipi/scsiconf.h> 84 85 /* Defines for device specific stuff */ 86 #define DEF_FIXED_BSIZE 512 87 #define ST_RETRIES 4 /* only on non IO commands */ 88 89 #define STMODE(z) ( minor(z) & 0x03) 90 #define STDSTY(z) ((minor(z) >> 2) & 0x03) 91 #define STUNIT(z) ((minor(z) >> 4) ) 92 93 #define NORMAL_MODE 0 94 #define NOREW_MODE 1 95 #define EJECT_MODE 2 96 #define CTRL_MODE 3 97 98 #define FALSE 0 99 #define TRUE 1 100 101 #define ST_IO_TIME (3 * 60 * 1000) /* 3 minutes */ 102 #define ST_CTL_TIME (30 * 1000) /* 30 seconds */ 103 #define ST_SPC_TIME (4 * 60 * 60 * 1000) /* 4 hours */ 104 105 #ifndef ST_MOUNT_DELAY 106 #define ST_MOUNT_DELAY 0 107 #endif 108 109 /* 110 * Define various devices that we know mis-behave in some way, 111 * and note how they are bad, so we can correct for them 112 */ 113 struct modes { 114 u_int quirks; /* same definitions as in quirkdata */ 115 int blksize; 116 u_int8_t density; 117 }; 118 119 struct quirkdata { 120 u_int quirks; 121 #define ST_Q_FORCE_BLKSIZE 0x0001 122 #define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */ 123 #define ST_Q_IGNORE_LOADS 0x0004 124 #define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */ 125 #define ST_Q_UNIMODAL 0x0010 /* unimode drive rejects mode select */ 126 #define ST_Q_NOPREVENT 0x0020 /* does not support PREVENT */ 127 #define ST_Q_ERASE_NOIMM 0x0040 /* drive rejects ERASE/w Immed bit */ 128 u_int page_0_size; 129 #define MAX_PAGE_0_SIZE 64 130 struct modes modes[4]; 131 }; 132 133 struct st_quirk_inquiry_pattern { 134 struct scsipi_inquiry_pattern pattern; 135 struct quirkdata quirkdata; 136 }; 137 138 struct st_quirk_inquiry_pattern st_quirk_patterns[] = { 139 {{T_SEQUENTIAL, T_REMOV, 140 " ", " ", " "}, {0, 0, { 141 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 142 {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */ 143 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */ 144 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */ 145 }}}, 146 {{T_SEQUENTIAL, T_REMOV, 147 "TANDBERG", " TDC 3600 ", ""}, {0, 12, { 148 {0, 0, 0}, /* minor 0-3 */ 149 {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 150 {0, 0, QIC_150}, /* minor 8-11 */ 151 {0, 0, QIC_120} /* minor 12-15 */ 152 }}}, 153 {{T_SEQUENTIAL, T_REMOV, 154 "TANDBERG", " TDC 3800 ", ""}, {0, 0, { 155 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 156 {0, 0, QIC_525}, /* minor 4-7 */ 157 {0, 0, QIC_150}, /* minor 8-11 */ 158 {0, 0, QIC_120} /* minor 12-15 */ 159 }}}, 160 /* 161 * lacking a manual for the 4200, it's not clear what the 162 * specific density codes should be- the device is a 2.5GB 163 * capable QIC drive, those density codes aren't readily 164 * availabel. The 'default' will just have to do. 165 */ 166 {{T_SEQUENTIAL, T_REMOV, 167 "TANDBERG", " TDC 4200 ", ""}, {0, 0, { 168 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 169 {0, 0, QIC_525}, /* minor 4-7 */ 170 {0, 0, QIC_150}, /* minor 8-11 */ 171 {0, 0, QIC_120} /* minor 12-15 */ 172 }}}, 173 /* 174 * At least -005 and -007 need this. I'll assume they all do unless I 175 * hear otherwise. - mycroft, 31MAR1994 176 */ 177 {{T_SEQUENTIAL, T_REMOV, 178 "ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, { 179 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 180 {ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */ 181 {0, 0, QIC_150}, /* minor 8-11 */ 182 {0, 0, QIC_120} /* minor 12-15 */ 183 }}}, 184 /* 185 * One user reports that this works for his tape drive. It probably 186 * needs more work. - mycroft, 09APR1994 187 */ 188 {{T_SEQUENTIAL, T_REMOV, 189 "SANKYO ", "CP525 ", ""}, {0, 0, { 190 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 191 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 192 {0, 0, QIC_150}, /* minor 8-11 */ 193 {0, 0, QIC_120} /* minor 12-15 */ 194 }}}, 195 {{T_SEQUENTIAL, T_REMOV, 196 "ANRITSU ", "DMT780 ", ""}, {0, 0, { 197 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 198 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 199 {0, 0, QIC_150}, /* minor 8-11 */ 200 {0, 0, QIC_120} /* minor 12-15 */ 201 }}}, 202 {{T_SEQUENTIAL, T_REMOV, 203 "ARCHIVE ", "VIPER 150 21247", ""}, {ST_Q_ERASE_NOIMM, 12, { 204 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 205 {0, 0, QIC_150}, /* minor 4-7 */ 206 {0, 0, QIC_120}, /* minor 8-11 */ 207 {0, 0, QIC_24} /* minor 12-15 */ 208 }}}, 209 {{T_SEQUENTIAL, T_REMOV, 210 "ARCHIVE ", "VIPER 150 21531", ""}, {ST_Q_ERASE_NOIMM, 12, { 211 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 212 {0, 0, QIC_150}, /* minor 4-7 */ 213 {0, 0, QIC_120}, /* minor 8-11 */ 214 {0, 0, QIC_24} /* minor 12-15 */ 215 }}}, 216 {{T_SEQUENTIAL, T_REMOV, 217 "WANGTEK ", "5099ES SCSI", ""}, {0, 0, { 218 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 219 {0, 0, QIC_11}, /* minor 4-7 */ 220 {0, 0, QIC_24}, /* minor 8-11 */ 221 {0, 0, QIC_24} /* minor 12-15 */ 222 }}}, 223 {{T_SEQUENTIAL, T_REMOV, 224 "WANGTEK ", "5150ES SCSI", ""}, {0, 0, { 225 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 226 {0, 0, QIC_24}, /* minor 4-7 */ 227 {0, 0, QIC_120}, /* minor 8-11 */ 228 {0, 0, QIC_150} /* minor 12-15 */ 229 }}}, 230 {{T_SEQUENTIAL, T_REMOV, 231 "WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, { 232 {0, 0, 0}, /* minor 0-3 */ 233 {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 234 {0, 0, QIC_150}, /* minor 8-11 */ 235 {0, 0, QIC_120} /* minor 12-15 */ 236 }}}, 237 {{T_SEQUENTIAL, T_REMOV, 238 "WangDAT ", "Model 1300 ", ""}, {0, 0, { 239 {0, 0, 0}, /* minor 0-3 */ 240 {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */ 241 {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */ 242 {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */ 243 }}}, 244 {{T_SEQUENTIAL, T_REMOV, 245 "EXABYTE ", "EXB-8200 ", "263H"}, {0, 5, { 246 {0, 0, 0}, /* minor 0-3 */ 247 {0, 0, 0}, /* minor 4-7 */ 248 {0, 0, 0}, /* minor 8-11 */ 249 {0, 0, 0} /* minor 12-15 */ 250 }}}, 251 {{T_SEQUENTIAL, T_REMOV, 252 "STK", "9490", ""}, 253 {ST_Q_FORCE_BLKSIZE, 0, { 254 {0, 0, 0}, /* minor 0-3 */ 255 {0, 0, 0}, /* minor 4-7 */ 256 {0, 0, 0}, /* minor 8-11 */ 257 {0, 0, 0} /* minor 12-15 */ 258 }}}, 259 {{T_SEQUENTIAL, T_REMOV, 260 "STK", "SD-3", ""}, 261 {ST_Q_FORCE_BLKSIZE, 0, { 262 {0, 0, 0}, /* minor 0-3 */ 263 {0, 0, 0}, /* minor 4-7 */ 264 {0, 0, 0}, /* minor 8-11 */ 265 {0, 0, 0} /* minor 12-15 */ 266 }}}, 267 {{T_SEQUENTIAL, T_REMOV, 268 "IBM", "03590", ""}, {ST_Q_IGNORE_LOADS, 0, { 269 {0, 0, 0}, /* minor 0-3 */ 270 {0, 0, 0}, /* minor 4-7 */ 271 {0, 0, 0}, /* minor 8-11 */ 272 {0, 0, 0} /* minor 12-15 */ 273 }}}, 274 {{T_SEQUENTIAL, T_REMOV, 275 "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, 0, { 276 {0, 0, QIC_3095}, /* minor 0-3 */ 277 {0, 0, QIC_3095}, /* minor 4-7 */ 278 {0, 0, QIC_3095}, /* minor 8-11 */ 279 {0, 0, QIC_3095}, /* minor 12-15 */ 280 }}}, 281 #if 0 282 {{T_SEQUENTIAL, T_REMOV, 283 "EXABYTE ", "EXB-8200 ", ""}, {0, 12, { 284 {0, 0, 0}, /* minor 0-3 */ 285 {0, 0, 0}, /* minor 4-7 */ 286 {0, 0, 0}, /* minor 8-11 */ 287 {0, 0, 0} /* minor 12-15 */ 288 }}}, 289 #endif 290 {{T_SEQUENTIAL, T_REMOV, 291 "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, 0, { 292 {0, 0, 0}, /* minor 0-3 */ 293 {0, 0, 0}, /* minor 4-7 */ 294 {0, 0, 0}, /* minor 8-11 */ 295 {0, 0, 0} /* minor 12-15 */ 296 }}}, 297 {{T_SEQUENTIAL, T_REMOV, 298 "OnStream", "ADR50 Drive", ""}, {ST_Q_UNIMODAL, 0, { 299 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 300 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 4-7 */ 301 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */ 302 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 12-15 */ 303 }}}, 304 {{T_SEQUENTIAL, T_REMOV, 305 "NCR H621", "0-STD-03-46F880 ", ""}, {ST_Q_NOPREVENT, 0, { 306 {0, 0, 0}, /* minor 0-3 */ 307 {0, 0, 0}, /* minor 4-7 */ 308 {0, 0, 0}, /* minor 8-11 */ 309 {0, 0, 0} /* minor 12-15 */ 310 }}}, 311 }; 312 313 #define NOEJECT 0 314 #define EJECT 1 315 316 struct st_softc { 317 struct device sc_dev; 318 /*--------------------present operating parameters, flags etc.---------------*/ 319 int flags; /* see below */ 320 u_int quirks; /* quirks for the open mode */ 321 int blksize; /* blksize we are using */ 322 u_int8_t density; /* present density */ 323 u_int page_0_size; /* size of page 0 data */ 324 u_int last_dsty; /* last density opened */ 325 short mt_resid; /* last (short) resid */ 326 short mt_erreg; /* last error (sense key) seen */ 327 #define mt_key mt_erreg 328 u_int8_t asc; /* last asc code seen */ 329 u_int8_t ascq; /* last asc code seen */ 330 /*--------------------device/scsi parameters---------------------------------*/ 331 struct scsipi_link *sc_link; /* our link to the adapter etc. */ 332 /*--------------------parameters reported by the device ---------------------*/ 333 int blkmin; /* min blk size */ 334 int blkmax; /* max blk size */ 335 struct quirkdata *quirkdata; /* if we have a rogue entry */ 336 /*--------------------parameters reported by the device for this media-------*/ 337 u_long numblks; /* nominal blocks capacity */ 338 int media_blksize; /* 0 if not ST_FIXEDBLOCKS */ 339 u_int8_t media_density; /* this is what it said when asked */ 340 /*--------------------quirks for the whole drive-----------------------------*/ 341 u_int drive_quirks; /* quirks of this drive */ 342 /*--------------------How we should set up when opening each minor device----*/ 343 struct modes modes[4]; /* plus more for each mode */ 344 u_int8_t modeflags[4]; /* flags for the modes */ 345 #define DENSITY_SET_BY_USER 0x01 346 #define DENSITY_SET_BY_QUIRK 0x02 347 #define BLKSIZE_SET_BY_USER 0x04 348 #define BLKSIZE_SET_BY_QUIRK 0x08 349 /*--------------------storage for sense data returned by the drive-----------*/ 350 u_char sense_data[MAX_PAGE_0_SIZE]; /* 351 * additional sense data needed 352 * for mode sense/select. 353 */ 354 struct buf_queue buf_queue; /* the queue of pending IO */ 355 /* operations */ 356 #if NRND > 0 357 rndsource_element_t rnd_source; 358 #endif 359 }; 360 361 362 int stmatch __P((struct device *, struct cfdata *, void *)); 363 void stattach __P((struct device *, struct device *, void *)); 364 void st_identify_drive __P((struct st_softc *, 365 struct scsipi_inquiry_pattern *)); 366 void st_loadquirks __P((struct st_softc *)); 367 int st_mount_tape __P((dev_t, int)); 368 void st_unmount __P((struct st_softc *, boolean)); 369 int st_decide_mode __P((struct st_softc *, boolean)); 370 void ststart __P((void *)); 371 void stdone __P((struct scsipi_xfer *)); 372 int st_read __P((struct st_softc *, char *, int, int)); 373 int st_read_block_limits __P((struct st_softc *, int)); 374 int st_mode_sense __P((struct st_softc *, int)); 375 int st_mode_select __P((struct st_softc *, int)); 376 int st_cmprss __P((struct st_softc *, int)); 377 int st_space __P((struct st_softc *, int, u_int, int)); 378 int st_write_filemarks __P((struct st_softc *, int, int)); 379 int st_check_eod __P((struct st_softc *, boolean, int *, int)); 380 int st_load __P((struct st_softc *, u_int, int)); 381 int st_rewind __P((struct st_softc *, u_int, int)); 382 int st_interpret_sense __P((struct scsipi_xfer *)); 383 int st_touch_tape __P((struct st_softc *)); 384 int st_erase __P((struct st_softc *, int full, int flags)); 385 int st_rdpos __P((struct st_softc *, int, u_int32_t *)); 386 int st_setpos __P((struct st_softc *, int, u_int32_t *)); 387 388 struct cfattach st_ca = { 389 sizeof(struct st_softc), stmatch, stattach 390 }; 391 392 extern struct cfdriver st_cd; 393 394 struct scsipi_device st_switch = { 395 st_interpret_sense, 396 ststart, 397 NULL, 398 stdone 399 }; 400 401 #define ST_INFO_VALID 0x0001 402 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 403 #define ST_WRITTEN 0x0004 /* data has been written, EOD needed */ 404 #define ST_FIXEDBLOCKS 0x0008 405 #define ST_AT_FILEMARK 0x0010 406 #define ST_EIO_PENDING 0x0020 /* error reporting deferred until next op */ 407 #define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 408 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 409 #define ST_FM_WRITTEN 0x0100 /* 410 * EOF file mark written -- used with 411 * ~ST_WRITTEN to indicate that multiple file 412 * marks have been written 413 */ 414 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 415 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 416 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 417 #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 418 #define ST_EARLYWARN 0x2000 /* Do (deferred) EOM for variable mode */ 419 #define ST_EOM_PENDING 0x4000 /* EOM reporting deferred until next op */ 420 421 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_EOM_PENDING | \ 422 ST_BLANK_READ) 423 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 424 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 425 ST_2FM_AT_EOD | ST_PER_ACTION) 426 427 #if defined(ST_ENABLE_EARLYWARN) 428 #define ST_INIT_FLAGS ST_EARLYWARN 429 #else 430 #define ST_INIT_FLAGS 0 431 #endif 432 433 struct scsipi_inquiry_pattern st_patterns[] = { 434 {T_SEQUENTIAL, T_REMOV, 435 "", "", ""}, 436 }; 437 438 int 439 stmatch(parent, match, aux) 440 struct device *parent; 441 struct cfdata *match; 442 void *aux; 443 { 444 struct scsipibus_attach_args *sa = aux; 445 int priority; 446 447 (void)scsipi_inqmatch(&sa->sa_inqbuf, 448 (caddr_t)st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 449 sizeof(st_patterns[0]), &priority); 450 return (priority); 451 } 452 453 /* 454 * The routine called by the low level scsi routine when it discovers 455 * A device suitable for this driver 456 */ 457 void 458 stattach(parent, self, aux) 459 struct device *parent, *self; 460 void *aux; 461 { 462 struct st_softc *st = (void *)self; 463 struct scsipibus_attach_args *sa = aux; 464 struct scsipi_link *sc_link = sa->sa_sc_link; 465 466 SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); 467 468 /* 469 * Store information needed to contact our base driver 470 */ 471 st->sc_link = sc_link; 472 sc_link->device = &st_switch; 473 sc_link->device_softc = st; 474 sc_link->openings = 1; 475 476 /* 477 * Set initial flags 478 */ 479 480 st->flags = ST_INIT_FLAGS; 481 482 /* 483 * Check if the drive is a known criminal and take 484 * Any steps needed to bring it into line 485 */ 486 st_identify_drive(st, &sa->sa_inqbuf); 487 /* 488 * Use the subdriver to request information regarding the drive. 489 */ 490 printf("\n"); 491 printf("%s: %s", st->sc_dev.dv_xname, st->quirkdata ? "rogue, " : ""); 492 if (scsipi_test_unit_ready(sc_link, 493 XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE) || 494 st_mode_sense(st, 495 XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE)) 496 printf("drive empty\n"); 497 else { 498 printf("density code %d, ", st->media_density); 499 if (st->media_blksize > 0) 500 printf("%d-byte", st->media_blksize); 501 else 502 printf("variable"); 503 printf(" blocks, write-%s\n", 504 (st->flags & ST_READONLY) ? "protected" : "enabled"); 505 } 506 507 /* 508 * Set up the buf queue for this device 509 */ 510 BUFQ_INIT(&st->buf_queue); 511 512 #if NRND > 0 513 rnd_attach_source(&st->rnd_source, st->sc_dev.dv_xname, 514 RND_TYPE_TAPE, 0); 515 #endif 516 } 517 518 /* 519 * Use the inquiry routine in 'scsi_base' to get drive info so we can 520 * Further tailor our behaviour. 521 */ 522 void 523 st_identify_drive(st, inqbuf) 524 struct st_softc *st; 525 struct scsipi_inquiry_pattern *inqbuf; 526 { 527 struct st_quirk_inquiry_pattern *finger; 528 int priority; 529 530 finger = (struct st_quirk_inquiry_pattern *)scsipi_inqmatch(inqbuf, 531 (caddr_t)st_quirk_patterns, 532 sizeof(st_quirk_patterns) / sizeof(st_quirk_patterns[0]), 533 sizeof(st_quirk_patterns[0]), &priority); 534 if (priority != 0) { 535 st->quirkdata = &finger->quirkdata; 536 st->drive_quirks = finger->quirkdata.quirks; 537 st->quirks = finger->quirkdata.quirks; /* start value */ 538 st->page_0_size = finger->quirkdata.page_0_size; 539 st_loadquirks(st); 540 } 541 } 542 543 /* 544 * initialise the subdevices to the default (QUIRK) state. 545 * this will remove any setting made by the system operator or previous 546 * operations. 547 */ 548 void 549 st_loadquirks(st) 550 struct st_softc *st; 551 { 552 int i; 553 struct modes *mode; 554 struct modes *mode2; 555 556 mode = st->quirkdata->modes; 557 mode2 = st->modes; 558 for (i = 0; i < 4; i++) { 559 bzero(mode2, sizeof(struct modes)); 560 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 561 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 562 DENSITY_SET_BY_USER); 563 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 564 mode2->blksize = mode->blksize; 565 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 566 } 567 if (mode->density) { 568 mode2->density = mode->density; 569 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 570 } 571 mode2->quirks |= mode->quirks; 572 mode++; 573 mode2++; 574 } 575 } 576 577 /* 578 * open the device. 579 */ 580 int 581 stopen(dev, flags, mode, p) 582 dev_t dev; 583 int flags; 584 int mode; 585 struct proc *p; 586 { 587 u_int stmode, dsty; 588 int error, sflags, unit, tries, ntries; 589 struct st_softc *st; 590 struct scsipi_link *sc_link; 591 592 unit = STUNIT(dev); 593 if (unit >= st_cd.cd_ndevs) 594 return (ENXIO); 595 st = st_cd.cd_devs[unit]; 596 if (st == NULL) 597 return (ENXIO); 598 599 stmode = STMODE(dev); 600 dsty = STDSTY(dev); 601 sc_link = st->sc_link; 602 603 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 604 unit, st_cd.cd_ndevs)); 605 606 607 /* 608 * Only allow one at a time 609 */ 610 if (sc_link->flags & SDEV_OPEN) { 611 printf("%s: already open\n", st->sc_dev.dv_xname); 612 return (EBUSY); 613 } 614 615 if ((error = scsipi_adapter_addref(sc_link)) != 0) 616 return (error); 617 618 /* 619 * clear any latched errors. 620 */ 621 st->mt_resid = 0; 622 st->mt_erreg = 0; 623 st->asc = 0; 624 st->ascq = 0; 625 626 /* 627 * Catch any unit attention errors. Be silent about this 628 * unless we're already mounted. We ignore media change 629 * if we're in control mode or not mounted yet. 630 */ 631 if ((st->flags & ST_MOUNTED) == 0 || stmode == CTRL_MODE) { 632 #ifdef SCSIDEBUG 633 sflags = XS_CTL_IGNORE_MEDIA_CHANGE; 634 #else 635 sflags = XS_CTL_SILENT|XS_CTL_IGNORE_MEDIA_CHANGE; 636 #endif 637 } else 638 sflags = 0; 639 640 /* 641 * If we're already mounted or we aren't configured for 642 * a mount delay, only try a test unit ready once. Otherwise, 643 * try up to ST_MOUNT_DELAY times with a rest interval of 644 * one second between each try. 645 */ 646 647 if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0) { 648 ntries = 1; 649 } else { 650 ntries = ST_MOUNT_DELAY; 651 } 652 653 for (error = tries = 0; tries < ntries; tries++) { 654 int slpintr, oflags; 655 656 /* 657 * If we had no error, or we're opening the control mode 658 * device, we jump out right away. 659 */ 660 661 error = scsipi_test_unit_ready(sc_link, sflags); 662 if (error == 0 || stmode == CTRL_MODE) { 663 break; 664 } 665 666 /* 667 * We had an error. 668 * 669 * If we're already mounted or we aren't configured for 670 * a mount delay, or the error isn't a NOT READY error, 671 * skip to the error exit now. 672 */ 673 if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0 || 674 (st->mt_key != SKEY_NOT_READY)) { 675 goto bad; 676 } 677 678 /* 679 * clear any latched errors. 680 */ 681 st->mt_resid = 0; 682 st->mt_erreg = 0; 683 st->asc = 0; 684 st->ascq = 0; 685 686 /* 687 * Fake that we have the device open so 688 * we block other apps from getting in. 689 */ 690 691 oflags = sc_link->flags; 692 sc_link->flags |= SDEV_OPEN; 693 694 slpintr = tsleep(&lbolt, PUSER|PCATCH, "stload", 0); 695 696 sc_link->flags = oflags; /* restore flags */ 697 698 if (slpintr) { 699 goto bad; 700 } 701 } 702 703 704 /* 705 * If the mode is 3 (e.g. minor = 3,7,11,15) then the device has 706 * been opened to set defaults and perform other, usually non-I/O 707 * related, operations. In this case, do a quick check to see 708 * whether the unit actually had a tape loaded (this will be known 709 * as to whether or not we got a NOT READY for the above 710 * unit attention). If a tape is there, go do a mount sequence. 711 */ 712 if (stmode == CTRL_MODE && st->mt_key == SKEY_NOT_READY) { 713 sc_link->flags |= SDEV_OPEN; 714 return (0); 715 } 716 717 /* 718 * If we get this far and had an error set, that means we failed 719 * to pass the 'test unit ready' test for the non-controlmode device, 720 * so we bounce the open. 721 */ 722 723 if (error) 724 return (error); 725 726 /* 727 * Else, we're now committed to saying we're open. 728 */ 729 730 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 731 732 /* 733 * If it's a different mode, or if the media has been 734 * invalidated, unmount the tape from the previous 735 * session but continue with open processing 736 */ 737 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 738 st_unmount(st, NOEJECT); 739 740 /* 741 * If we are not mounted, then we should start a new 742 * mount session. 743 */ 744 if (!(st->flags & ST_MOUNTED)) { 745 if ((error = st_mount_tape(dev, flags)) != 0) 746 goto bad; 747 st->last_dsty = dsty; 748 } 749 750 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 751 return (0); 752 753 bad: 754 st_unmount(st, NOEJECT); 755 scsipi_adapter_delref(sc_link); 756 sc_link->flags &= ~SDEV_OPEN; 757 return (error); 758 } 759 760 /* 761 * close the device.. only called if we are the LAST 762 * occurence of an open device 763 */ 764 int 765 stclose(dev, flags, mode, p) 766 dev_t dev; 767 int flags; 768 int mode; 769 struct proc *p; 770 { 771 int stxx, error = 0; 772 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 773 774 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 775 776 /* 777 * Make sure that a tape opened in write-only mode will have 778 * file marks written on it when closed, even if not written to. 779 * 780 * This is for SUN compatibility. Actually, the Sun way of 781 * things is to: 782 * 783 * only write filemarks if there are fmks to be written and 784 * - open for write (possibly read/write) 785 * - the last operation was a write 786 * or: 787 * - opened for wronly 788 * - no data was written (including filemarks) 789 */ 790 791 stxx = st->flags & (ST_WRITTEN | ST_FM_WRITTEN); 792 if (((flags & FWRITE) && stxx == ST_WRITTEN) || 793 ((flags & O_ACCMODE) == FWRITE && stxx == 0)) { 794 int nm; 795 error = st_check_eod(st, FALSE, &nm, 0); 796 } 797 798 switch (STMODE(dev)) { 799 case NORMAL_MODE: 800 st_unmount(st, NOEJECT); 801 break; 802 case NOREW_MODE: 803 case CTRL_MODE: 804 /* 805 * Leave mounted unless media seems to have been removed. 806 * 807 * Otherwise, if we're to terminate a tape with more than one 808 * filemark [ and because we're not rewinding here ], backspace 809 * one filemark so that later appends will see an unbroken 810 * sequence of: 811 * 812 * file - FMK - file - FMK ... file - FMK FMK (EOM) 813 */ 814 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) { 815 st_unmount(st, NOEJECT); 816 } else if (error == 0) { 817 /* 818 * ST_WRITTEN was preserved from above. 819 * 820 * All we need to know here is: 821 * 822 * Were we writing this tape and was the last 823 * operation a write? 824 * 825 * Are there supposed to be 2FM at EOD? 826 * 827 * If both statements are true, then we backspace 828 * one filemark. 829 */ 830 stxx |= (st->flags & ST_2FM_AT_EOD); 831 if ((flags & FWRITE) != 0 && 832 (stxx == (ST_2FM_AT_EOD|ST_WRITTEN))) { 833 error = st_space(st, -1, SP_FILEMARKS, 0); 834 } 835 } 836 break; 837 case EJECT_MODE: 838 st_unmount(st, EJECT); 839 break; 840 } 841 842 scsipi_wait_drain(st->sc_link); 843 844 scsipi_adapter_delref(st->sc_link); 845 st->sc_link->flags &= ~SDEV_OPEN; 846 847 return (error); 848 } 849 850 /* 851 * Start a new mount session. 852 * Copy in all the default parameters from the selected device mode. 853 * and try guess any that seem to be defaulted. 854 */ 855 int 856 st_mount_tape(dev, flags) 857 dev_t dev; 858 int flags; 859 { 860 int unit; 861 u_int dsty; 862 struct st_softc *st; 863 struct scsipi_link *sc_link; 864 int error = 0; 865 866 unit = STUNIT(dev); 867 dsty = STDSTY(dev); 868 st = st_cd.cd_devs[unit]; 869 sc_link = st->sc_link; 870 871 if (st->flags & ST_MOUNTED) 872 return (0); 873 874 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 875 st->flags |= ST_NEW_MOUNT; 876 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 877 /* 878 * If the media is new, then make sure we give it a chance to 879 * to do a 'load' instruction. (We assume it is new.) 880 */ 881 if ((error = st_load(st, LD_LOAD, XS_CTL_SILENT)) != 0) 882 return (error); 883 /* 884 * Throw another dummy instruction to catch 885 * 'Unit attention' errors. Many drives give 886 * these after doing a Load instruction (with 887 * the MEDIUM MAY HAVE CHANGED asc/ascq). 888 */ 889 scsipi_test_unit_ready(sc_link, XS_CTL_SILENT); /* XXX */ 890 891 /* 892 * Some devices can't tell you much until they have been 893 * asked to look at the media. This quirk does this. 894 */ 895 if (st->quirks & ST_Q_SENSE_HELP) 896 if ((error = st_touch_tape(st)) != 0) 897 return (error); 898 /* 899 * Load the physical device parameters 900 * loads: blkmin, blkmax 901 */ 902 if ((error = st_read_block_limits(st, 0)) != 0) 903 return (error); 904 /* 905 * Load the media dependent parameters 906 * includes: media_blksize,media_density,numblks 907 * As we have a tape in, it should be reflected here. 908 * If not you may need the "quirk" above. 909 */ 910 if ((error = st_mode_sense(st, 0)) != 0) 911 return (error); 912 /* 913 * If we have gained a permanent density from somewhere, 914 * then use it in preference to the one supplied by 915 * default by the driver. 916 */ 917 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 918 st->density = st->modes[dsty].density; 919 else 920 st->density = st->media_density; 921 /* 922 * If we have gained a permanent blocksize 923 * then use it in preference to the one supplied by 924 * default by the driver. 925 */ 926 st->flags &= ~ST_FIXEDBLOCKS; 927 if (st->modeflags[dsty] & 928 (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 929 st->blksize = st->modes[dsty].blksize; 930 if (st->blksize) 931 st->flags |= ST_FIXEDBLOCKS; 932 } else { 933 if ((error = st_decide_mode(st, FALSE)) != 0) 934 return (error); 935 } 936 if ((error = st_mode_select(st, 0)) != 0) { 937 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 938 return (error); 939 } 940 if (!(st->quirks & ST_Q_NOPREVENT)) { 941 scsipi_prevent(sc_link, PR_PREVENT, 942 XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY); 943 } 944 st->flags &= ~ST_NEW_MOUNT; 945 st->flags |= ST_MOUNTED; 946 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 947 948 return (0); 949 } 950 951 /* 952 * End the present mount session. 953 * Rewind, and optionally eject the tape. 954 * Reset various flags to indicate that all new 955 * operations require another mount operation 956 */ 957 void 958 st_unmount(st, eject) 959 struct st_softc *st; 960 boolean eject; 961 { 962 struct scsipi_link *sc_link = st->sc_link; 963 int nmarks; 964 965 if (!(st->flags & ST_MOUNTED)) 966 return; 967 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 968 st_check_eod(st, FALSE, &nmarks, XS_CTL_IGNORE_NOT_READY); 969 st_rewind(st, 0, XS_CTL_IGNORE_NOT_READY); 970 971 /* 972 * Section 9.3.3 of the SCSI specs states that a device shall return 973 * the density value specified in the last succesfull MODE SELECT 974 * after an unload operation, in case it is not able to 975 * automatically determine the density of the new medium. 976 * 977 * So we instruct the device to use the default density, which will 978 * prevent the use of stale density values (in particular, 979 * in st_touch_tape(). 980 */ 981 st->density = 0; 982 if (st_mode_select(st, 0) != 0) { 983 printf("%s: WARNING: cannot revert to default density\n", 984 st->sc_dev.dv_xname); 985 } 986 987 scsipi_prevent(sc_link, PR_ALLOW, 988 XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY); 989 if (eject) 990 st_load(st, LD_UNLOAD, XS_CTL_IGNORE_NOT_READY); 991 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 992 sc_link->flags &= ~SDEV_MEDIA_LOADED; 993 } 994 995 /* 996 * Given all we know about the device, media, mode, 'quirks' and 997 * initial operation, make a decision as to how we should be set 998 * to run (regarding blocking and EOD marks) 999 */ 1000 int 1001 st_decide_mode(st, first_read) 1002 struct st_softc *st; 1003 boolean first_read; 1004 { 1005 #ifdef SCSIDEBUG 1006 struct scsipi_link *sc_link = st->sc_link; 1007 #endif 1008 1009 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 1010 1011 /* 1012 * If the drive can only handle fixed-length blocks and only at 1013 * one size, perhaps we should just do that. 1014 */ 1015 if (st->blkmin && (st->blkmin == st->blkmax)) { 1016 st->flags |= ST_FIXEDBLOCKS; 1017 st->blksize = st->blkmin; 1018 SC_DEBUG(sc_link, SDEV_DB3, 1019 ("blkmin == blkmax of %d\n", st->blkmin)); 1020 goto done; 1021 } 1022 /* 1023 * If the tape density mandates (or even suggests) use of fixed 1024 * or variable-length blocks, comply. 1025 */ 1026 switch (st->density) { 1027 case HALFINCH_800: 1028 case HALFINCH_1600: 1029 case HALFINCH_6250: 1030 case DDS: 1031 st->flags &= ~ST_FIXEDBLOCKS; 1032 st->blksize = 0; 1033 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 1034 goto done; 1035 case QIC_11: 1036 case QIC_24: 1037 case QIC_120: 1038 case QIC_150: 1039 case QIC_525: 1040 case QIC_1320: 1041 case QIC_3095: 1042 case QIC_3220: 1043 st->flags |= ST_FIXEDBLOCKS; 1044 if (st->media_blksize > 0) 1045 st->blksize = st->media_blksize; 1046 else 1047 st->blksize = DEF_FIXED_BSIZE; 1048 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 1049 goto done; 1050 } 1051 /* 1052 * If we're about to read the tape, perhaps we should choose 1053 * fixed or variable-length blocks and block size according to 1054 * what the drive found on the tape. 1055 */ 1056 if (first_read && 1057 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 1058 (st->media_blksize == DEF_FIXED_BSIZE) || 1059 (st->media_blksize == 1024))) { 1060 if (st->media_blksize > 0) 1061 st->flags |= ST_FIXEDBLOCKS; 1062 else 1063 st->flags &= ~ST_FIXEDBLOCKS; 1064 st->blksize = st->media_blksize; 1065 SC_DEBUG(sc_link, SDEV_DB3, 1066 ("Used media_blksize of %d\n", st->media_blksize)); 1067 goto done; 1068 } 1069 /* 1070 * We're getting no hints from any direction. Choose variable- 1071 * length blocks arbitrarily. 1072 */ 1073 st->flags &= ~ST_FIXEDBLOCKS; 1074 st->blksize = 0; 1075 SC_DEBUG(sc_link, SDEV_DB3, 1076 ("Give up and default to variable mode\n")); 1077 1078 done: 1079 /* 1080 * Decide whether or not to write two file marks to signify end- 1081 * of-data. Make the decision as a function of density. If 1082 * the decision is not to use a second file mark, the SCSI BLANK 1083 * CHECK condition code will be recognized as end-of-data when 1084 * first read. 1085 * (I think this should be a by-product of fixed/variable..julian) 1086 */ 1087 switch (st->density) { 1088 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 1089 case QIC_11: 1090 case QIC_24: 1091 case QIC_120: 1092 case QIC_150: 1093 case QIC_525: 1094 case QIC_1320: 1095 case QIC_3095: 1096 case QIC_3220: 1097 st->flags &= ~ST_2FM_AT_EOD; 1098 break; 1099 default: 1100 st->flags |= ST_2FM_AT_EOD; 1101 } 1102 return (0); 1103 } 1104 1105 /* 1106 * Actually translate the requested transfer into 1107 * one the physical driver can understand 1108 * The transfer is described by a buf and will include 1109 * only one physical transfer. 1110 */ 1111 void 1112 ststrategy(bp) 1113 struct buf *bp; 1114 { 1115 struct st_softc *st = st_cd.cd_devs[STUNIT(bp->b_dev)]; 1116 int s; 1117 1118 SC_DEBUG(st->sc_link, SDEV_DB1, 1119 ("ststrategy %ld bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); 1120 /* 1121 * If it's a null transfer, return immediatly 1122 */ 1123 if (bp->b_bcount == 0) 1124 goto done; 1125 1126 /* If offset is negative, error */ 1127 if (bp->b_blkno < 0) { 1128 bp->b_error = EINVAL; 1129 goto bad; 1130 } 1131 1132 /* 1133 * Odd sized request on fixed drives are verboten 1134 */ 1135 if (st->flags & ST_FIXEDBLOCKS) { 1136 if (bp->b_bcount % st->blksize) { 1137 printf("%s: bad request, must be multiple of %d\n", 1138 st->sc_dev.dv_xname, st->blksize); 1139 bp->b_error = EIO; 1140 goto bad; 1141 } 1142 } 1143 /* 1144 * as are out-of-range requests on variable drives. 1145 */ 1146 else if (bp->b_bcount < st->blkmin || 1147 (st->blkmax && bp->b_bcount > st->blkmax)) { 1148 printf("%s: bad request, must be between %d and %d\n", 1149 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 1150 bp->b_error = EIO; 1151 goto bad; 1152 } 1153 s = splbio(); 1154 1155 /* 1156 * Place it in the queue of activities for this tape 1157 * at the end (a bit silly because we only have on user.. 1158 * (but it could fork())) 1159 */ 1160 BUFQ_INSERT_TAIL(&st->buf_queue, bp); 1161 1162 /* 1163 * Tell the device to get going on the transfer if it's 1164 * not doing anything, otherwise just wait for completion 1165 * (All a bit silly if we're only allowing 1 open but..) 1166 */ 1167 ststart(st); 1168 1169 splx(s); 1170 return; 1171 bad: 1172 bp->b_flags |= B_ERROR; 1173 done: 1174 /* 1175 * Correctly set the buf to indicate a completed xfer 1176 */ 1177 bp->b_resid = bp->b_bcount; 1178 biodone(bp); 1179 return; 1180 } 1181 1182 /* 1183 * ststart looks to see if there is a buf waiting for the device 1184 * and that the device is not already busy. If both are true, 1185 * It dequeues the buf and creates a scsi command to perform the 1186 * transfer required. The transfer request will call scsipi_done 1187 * on completion, which will in turn call this routine again 1188 * so that the next queued transfer is performed. 1189 * The bufs are queued by the strategy routine (ststrategy) 1190 * 1191 * This routine is also called after other non-queued requests 1192 * have been made of the scsi driver, to ensure that the queue 1193 * continues to be drained. 1194 * ststart() is called at splbio 1195 */ 1196 void 1197 ststart(v) 1198 void *v; 1199 { 1200 struct st_softc *st = v; 1201 struct scsipi_link *sc_link = st->sc_link; 1202 struct buf *bp; 1203 struct scsi_rw_tape cmd; 1204 int flags, error; 1205 1206 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 1207 /* 1208 * See if there is a buf to do and we are not already 1209 * doing one 1210 */ 1211 while (sc_link->active < sc_link->openings) { 1212 /* if a special awaits, let it proceed first */ 1213 if (sc_link->flags & SDEV_WAITING) { 1214 sc_link->flags &= ~SDEV_WAITING; 1215 wakeup((caddr_t)sc_link); 1216 return; 1217 } 1218 1219 if ((bp = BUFQ_FIRST(&st->buf_queue)) == NULL) 1220 return; 1221 BUFQ_REMOVE(&st->buf_queue, bp); 1222 1223 /* 1224 * If the device has been unmounted by the user 1225 * then throw away all requests until done. 1226 */ 1227 if (!(st->flags & ST_MOUNTED) || 1228 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 1229 /* make sure that one implies the other.. */ 1230 sc_link->flags &= ~SDEV_MEDIA_LOADED; 1231 bp->b_flags |= B_ERROR; 1232 bp->b_error = EIO; 1233 bp->b_resid = bp->b_bcount; 1234 biodone(bp); 1235 continue; 1236 } 1237 /* 1238 * only FIXEDBLOCK devices have pending I/O or space operations. 1239 */ 1240 if (st->flags & ST_FIXEDBLOCKS) { 1241 /* 1242 * If we are at a filemark but have not reported it yet 1243 * then we should report it now 1244 */ 1245 if (st->flags & ST_AT_FILEMARK) { 1246 if ((bp->b_flags & B_READ) == B_WRITE) { 1247 /* 1248 * Handling of ST_AT_FILEMARK in 1249 * st_space will fill in the right file 1250 * mark count. 1251 * Back up over filemark 1252 */ 1253 if (st_space(st, 0, SP_FILEMARKS, 0)) { 1254 bp->b_flags |= B_ERROR; 1255 bp->b_error = EIO; 1256 biodone(bp); 1257 continue; 1258 } 1259 } else { 1260 bp->b_resid = bp->b_bcount; 1261 bp->b_error = 0; 1262 bp->b_flags &= ~B_ERROR; 1263 st->flags &= ~ST_AT_FILEMARK; 1264 biodone(bp); 1265 continue; /* seek more work */ 1266 } 1267 } 1268 } 1269 /* 1270 * If we are at EOM but have not reported it 1271 * yet then we should report it now. 1272 */ 1273 if (st->flags & (ST_EOM_PENDING|ST_EIO_PENDING)) { 1274 bp->b_resid = bp->b_bcount; 1275 if (st->flags & ST_EIO_PENDING) { 1276 bp->b_error = EIO; 1277 bp->b_flags |= B_ERROR; 1278 } 1279 st->flags &= ~(ST_EOM_PENDING|ST_EIO_PENDING); 1280 biodone(bp); 1281 continue; /* seek more work */ 1282 } 1283 1284 /* 1285 * Fill out the scsi command 1286 */ 1287 bzero(&cmd, sizeof(cmd)); 1288 if ((bp->b_flags & B_READ) == B_WRITE) { 1289 cmd.opcode = WRITE; 1290 st->flags &= ~ST_FM_WRITTEN; 1291 flags = XS_CTL_DATA_OUT; 1292 } else { 1293 cmd.opcode = READ; 1294 flags = XS_CTL_DATA_IN; 1295 } 1296 1297 /* 1298 * Handle "fixed-block-mode" tape drives by using the 1299 * block count instead of the length. 1300 */ 1301 if (st->flags & ST_FIXEDBLOCKS) { 1302 cmd.byte2 |= SRW_FIXED; 1303 _lto3b(bp->b_bcount / st->blksize, cmd.len); 1304 } else 1305 _lto3b(bp->b_bcount, cmd.len); 1306 1307 /* 1308 * go ask the adapter to do all this for us 1309 * XXX Really need NOSLEEP? 1310 */ 1311 error = scsipi_command(sc_link, 1312 (struct scsipi_generic *)&cmd, sizeof(cmd), 1313 (u_char *)bp->b_data, bp->b_bcount, 1314 0, ST_IO_TIME, bp, flags | XS_CTL_NOSLEEP | XS_CTL_ASYNC); 1315 if (error) { 1316 printf("%s: not queued, error %d\n", 1317 st->sc_dev.dv_xname, error); 1318 } 1319 } /* go back and see if we can cram more work in.. */ 1320 } 1321 1322 void 1323 stdone(xs) 1324 struct scsipi_xfer *xs; 1325 { 1326 1327 if (xs->bp != NULL) { 1328 struct st_softc *st = xs->sc_link->device_softc; 1329 if ((xs->bp->b_flags & B_READ) == B_WRITE) { 1330 st->flags |= ST_WRITTEN; 1331 } else { 1332 st->flags &= ~ST_WRITTEN; 1333 } 1334 #if NRND > 0 1335 rnd_add_uint32(&st->rnd_source, xs->bp->b_blkno); 1336 #endif 1337 } 1338 } 1339 1340 int 1341 stread(dev, uio, iomode) 1342 dev_t dev; 1343 struct uio *uio; 1344 int iomode; 1345 { 1346 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1347 1348 return (physio(ststrategy, NULL, dev, B_READ, 1349 st->sc_link->adapter->scsipi_minphys, uio)); 1350 } 1351 1352 int 1353 stwrite(dev, uio, iomode) 1354 dev_t dev; 1355 struct uio *uio; 1356 int iomode; 1357 { 1358 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1359 1360 return (physio(ststrategy, NULL, dev, B_WRITE, 1361 st->sc_link->adapter->scsipi_minphys, uio)); 1362 } 1363 1364 /* 1365 * Perform special action on behalf of the user; 1366 * knows about the internals of this device 1367 */ 1368 int 1369 stioctl(dev, cmd, arg, flag, p) 1370 dev_t dev; 1371 u_long cmd; 1372 caddr_t arg; 1373 int flag; 1374 struct proc *p; 1375 { 1376 int error = 0; 1377 int unit; 1378 int number, nmarks, dsty; 1379 int flags; 1380 struct st_softc *st; 1381 int hold_blksize; 1382 u_int8_t hold_density; 1383 struct mtop *mt = (struct mtop *) arg; 1384 1385 /* 1386 * Find the device that the user is talking about 1387 */ 1388 flags = 0; /* give error messages, act on errors etc. */ 1389 unit = STUNIT(dev); 1390 dsty = STDSTY(dev); 1391 st = st_cd.cd_devs[unit]; 1392 hold_blksize = st->blksize; 1393 hold_density = st->density; 1394 1395 switch ((u_int) cmd) { 1396 1397 case MTIOCGET: { 1398 struct mtget *g = (struct mtget *) arg; 1399 /* 1400 * (to get the current state of READONLY) 1401 */ 1402 error = st_mode_sense(st, XS_CTL_SILENT); 1403 if (error) { 1404 /* 1405 * Ignore the error if in control mode; 1406 * this is mandated by st(4). 1407 */ 1408 if (STMODE(dev) != CTRL_MODE) 1409 break; 1410 error = 0; 1411 } 1412 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1413 bzero(g, sizeof(struct mtget)); 1414 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1415 g->mt_blksiz = st->blksize; 1416 g->mt_density = st->density; 1417 g->mt_mblksiz[0] = st->modes[0].blksize; 1418 g->mt_mblksiz[1] = st->modes[1].blksize; 1419 g->mt_mblksiz[2] = st->modes[2].blksize; 1420 g->mt_mblksiz[3] = st->modes[3].blksize; 1421 g->mt_mdensity[0] = st->modes[0].density; 1422 g->mt_mdensity[1] = st->modes[1].density; 1423 g->mt_mdensity[2] = st->modes[2].density; 1424 g->mt_mdensity[3] = st->modes[3].density; 1425 if (st->flags & ST_READONLY) 1426 g->mt_dsreg |= MT_DS_RDONLY; 1427 if (st->flags & ST_MOUNTED) 1428 g->mt_dsreg |= MT_DS_MOUNTED; 1429 g->mt_resid = st->mt_resid; 1430 g->mt_erreg = st->mt_erreg; 1431 /* 1432 * clear latched errors. 1433 */ 1434 st->mt_resid = 0; 1435 st->mt_erreg = 0; 1436 st->asc = 0; 1437 st->ascq = 0; 1438 break; 1439 } 1440 case MTIOCTOP: { 1441 1442 SC_DEBUG(st->sc_link, SDEV_DB1, 1443 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, 1444 mt->mt_count)); 1445 1446 /* compat: in U*x it is a short */ 1447 number = mt->mt_count; 1448 switch ((short) (mt->mt_op)) { 1449 case MTWEOF: /* write an end-of-file record */ 1450 error = st_write_filemarks(st, number, flags); 1451 break; 1452 case MTBSF: /* backward space file */ 1453 number = -number; 1454 case MTFSF: /* forward space file */ 1455 error = st_check_eod(st, FALSE, &nmarks, flags); 1456 if (!error) 1457 error = st_space(st, number - nmarks, 1458 SP_FILEMARKS, flags); 1459 break; 1460 case MTBSR: /* backward space record */ 1461 number = -number; 1462 case MTFSR: /* forward space record */ 1463 error = st_check_eod(st, TRUE, &nmarks, flags); 1464 if (!error) 1465 error = st_space(st, number, SP_BLKS, flags); 1466 break; 1467 case MTREW: /* rewind */ 1468 error = st_rewind(st, 0, flags); 1469 break; 1470 case MTOFFL: /* rewind and put the drive offline */ 1471 st_unmount(st, EJECT); 1472 break; 1473 case MTNOP: /* no operation, sets status only */ 1474 break; 1475 case MTRETEN: /* retension the tape */ 1476 error = st_load(st, LD_RETENSION, flags); 1477 if (!error) 1478 error = st_load(st, LD_LOAD, flags); 1479 break; 1480 case MTEOM: /* forward space to end of media */ 1481 error = st_check_eod(st, FALSE, &nmarks, flags); 1482 if (!error) 1483 error = st_space(st, 1, SP_EOM, flags); 1484 break; 1485 case MTCACHE: /* enable controller cache */ 1486 st->flags &= ~ST_DONTBUFFER; 1487 goto try_new_value; 1488 case MTNOCACHE: /* disable controller cache */ 1489 st->flags |= ST_DONTBUFFER; 1490 goto try_new_value; 1491 case MTERASE: /* erase volume */ 1492 error = st_erase(st, number, flags); 1493 break; 1494 case MTSETBSIZ: /* Set block size for device */ 1495 #ifdef NOTYET 1496 if (!(st->flags & ST_NEW_MOUNT)) { 1497 uprintf("re-mount tape before changing blocksize"); 1498 error = EINVAL; 1499 break; 1500 } 1501 #endif 1502 if (number == 0) 1503 st->flags &= ~ST_FIXEDBLOCKS; 1504 else { 1505 if ((st->blkmin || st->blkmax) && 1506 (number < st->blkmin || 1507 number > st->blkmax)) { 1508 error = EINVAL; 1509 break; 1510 } 1511 st->flags |= ST_FIXEDBLOCKS; 1512 } 1513 st->blksize = number; 1514 st->flags |= ST_BLOCK_SET; /*XXX */ 1515 goto try_new_value; 1516 1517 case MTSETDNSTY: /* Set density for device and mode */ 1518 /* 1519 * Any number >= 0 and <= 0xff is legal. Numbers 1520 * above 0x80 are 'vendor unique'. 1521 */ 1522 if (number < 0 || number > 255) { 1523 error = EINVAL; 1524 break; 1525 } else 1526 st->density = number; 1527 goto try_new_value; 1528 1529 case MTCMPRESS: 1530 error = st_cmprss(st, number); 1531 break; 1532 1533 case MTEWARN: 1534 if (number) 1535 st->flags |= ST_EARLYWARN; 1536 else 1537 st->flags &= ~ST_EARLYWARN; 1538 break; 1539 1540 default: 1541 error = EINVAL; 1542 } 1543 break; 1544 } 1545 case MTIOCIEOT: 1546 case MTIOCEEOT: 1547 break; 1548 1549 case MTIOCRDSPOS: 1550 error = st_rdpos(st, 0, (u_int32_t *) arg); 1551 break; 1552 1553 case MTIOCRDHPOS: 1554 error = st_rdpos(st, 1, (u_int32_t *) arg); 1555 break; 1556 1557 case MTIOCSLOCATE: 1558 error = st_setpos(st, 0, (u_int32_t *) arg); 1559 break; 1560 1561 case MTIOCHLOCATE: 1562 error = st_setpos(st, 1, (u_int32_t *) arg); 1563 break; 1564 1565 1566 default: 1567 error = scsipi_do_ioctl(st->sc_link, dev, cmd, arg, 1568 flag, p); 1569 break; 1570 } 1571 return (error); 1572 /*-----------------------------*/ 1573 try_new_value: 1574 /* 1575 * Check that the mode being asked for is aggreeable to the 1576 * drive. If not, put it back the way it was. 1577 * 1578 * If in control mode, we can make (persistent) mode changes 1579 * even if no medium is loaded (see st(4)). 1580 */ 1581 if ((STMODE(dev) != CTRL_MODE || (st->flags & ST_MOUNTED) != 0) && 1582 (error = st_mode_select(st, 0)) != 0) { 1583 /* put it back as it was */ 1584 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1585 st->density = hold_density; 1586 st->blksize = hold_blksize; 1587 if (st->blksize) 1588 st->flags |= ST_FIXEDBLOCKS; 1589 else 1590 st->flags &= ~ST_FIXEDBLOCKS; 1591 return (error); 1592 } 1593 /* 1594 * As the drive liked it, if we are setting a new default, 1595 * set it into the structures as such. 1596 * 1597 * The means for deciding this are not finalised yet- but 1598 * if the device was opened in Control Mode, the values 1599 * are persistent now across mounts. 1600 */ 1601 if (STMODE(dev) == CTRL_MODE) { 1602 switch ((short) (mt->mt_op)) { 1603 case MTSETBSIZ: 1604 st->modes[dsty].blksize = st->blksize; 1605 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1606 break; 1607 case MTSETDNSTY: 1608 st->modes[dsty].density = st->density; 1609 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1610 break; 1611 } 1612 } 1613 return (0); 1614 } 1615 1616 /* 1617 * Do a synchronous read. 1618 */ 1619 int 1620 st_read(st, buf, size, flags) 1621 struct st_softc *st; 1622 int size; 1623 int flags; 1624 char *buf; 1625 { 1626 struct scsi_rw_tape cmd; 1627 1628 /* 1629 * If it's a null transfer, return immediatly 1630 */ 1631 if (size == 0) 1632 return (0); 1633 bzero(&cmd, sizeof(cmd)); 1634 cmd.opcode = READ; 1635 if (st->flags & ST_FIXEDBLOCKS) { 1636 cmd.byte2 |= SRW_FIXED; 1637 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1638 cmd.len); 1639 } else 1640 _lto3b(size, cmd.len); 1641 return (scsipi_command(st->sc_link, 1642 (struct scsipi_generic *)&cmd, sizeof(cmd), 1643 (u_char *)buf, size, 0, ST_IO_TIME, NULL, flags | XS_CTL_DATA_IN)); 1644 } 1645 1646 /* 1647 * Ask the drive what it's min and max blk sizes are. 1648 */ 1649 int 1650 st_read_block_limits(st, flags) 1651 struct st_softc *st; 1652 int flags; 1653 { 1654 struct scsi_block_limits cmd; 1655 struct scsi_block_limits_data block_limits; 1656 struct scsipi_link *sc_link = st->sc_link; 1657 int error; 1658 1659 /* 1660 * do a 'Read Block Limits' 1661 */ 1662 bzero(&cmd, sizeof(cmd)); 1663 cmd.opcode = READ_BLOCK_LIMITS; 1664 1665 /* 1666 * do the command, update the global values 1667 */ 1668 error = scsipi_command(sc_link, (struct scsipi_generic *)&cmd, 1669 sizeof(cmd), (u_char *)&block_limits, sizeof(block_limits), 1670 ST_RETRIES, ST_CTL_TIME, NULL, 1671 flags | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK); 1672 if (error) 1673 return (error); 1674 1675 st->blkmin = _2btol(block_limits.min_length); 1676 st->blkmax = _3btol(block_limits.max_length); 1677 1678 SC_DEBUG(sc_link, SDEV_DB3, 1679 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1680 return (0); 1681 } 1682 1683 /* 1684 * Get the scsi driver to send a full inquiry to the 1685 * device and use the results to fill out the global 1686 * parameter structure. 1687 * 1688 * called from: 1689 * attach 1690 * open 1691 * ioctl (to reset original blksize) 1692 */ 1693 int 1694 st_mode_sense(st, flags) 1695 struct st_softc *st; 1696 int flags; 1697 { 1698 u_int scsipi_sense_len; 1699 int error; 1700 struct scsi_mode_sense cmd; 1701 struct scsipi_sense { 1702 struct scsi_mode_header header; 1703 struct scsi_blk_desc blk_desc; 1704 u_char sense_data[MAX_PAGE_0_SIZE]; 1705 } scsipi_sense; 1706 struct scsipi_link *sc_link = st->sc_link; 1707 1708 scsipi_sense_len = 12 + st->page_0_size; 1709 1710 /* 1711 * Set up a mode sense 1712 */ 1713 bzero(&cmd, sizeof(cmd)); 1714 cmd.opcode = SCSI_MODE_SENSE; 1715 cmd.length = scsipi_sense_len; 1716 1717 /* 1718 * do the command, but we don't need the results 1719 * just print them for our interest's sake, if asked, 1720 * or if we need it as a template for the mode select 1721 * store it away. 1722 */ 1723 error = scsipi_command(sc_link, (struct scsipi_generic *)&cmd, 1724 sizeof(cmd), (u_char *)&scsipi_sense, scsipi_sense_len, 1725 ST_RETRIES, ST_CTL_TIME, NULL, 1726 flags | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK); 1727 if (error) 1728 return (error); 1729 1730 st->numblks = _3btol(scsipi_sense.blk_desc.nblocks); 1731 st->media_blksize = _3btol(scsipi_sense.blk_desc.blklen); 1732 st->media_density = scsipi_sense.blk_desc.density; 1733 if (scsipi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) 1734 st->flags |= ST_READONLY; 1735 else 1736 st->flags &= ~ST_READONLY; 1737 SC_DEBUG(sc_link, SDEV_DB3, 1738 ("density code %d, %d-byte blocks, write-%s, ", 1739 st->media_density, st->media_blksize, 1740 st->flags & ST_READONLY ? "protected" : "enabled")); 1741 SC_DEBUG(sc_link, SDEV_DB3, 1742 ("%sbuffered\n", 1743 scsipi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1744 if (st->page_0_size) 1745 bcopy(scsipi_sense.sense_data, st->sense_data, 1746 st->page_0_size); 1747 sc_link->flags |= SDEV_MEDIA_LOADED; 1748 return (0); 1749 } 1750 1751 /* 1752 * Send a filled out parameter structure to the drive to 1753 * set it into the desire modes etc. 1754 */ 1755 int 1756 st_mode_select(st, flags) 1757 struct st_softc *st; 1758 int flags; 1759 { 1760 u_int scsi_select_len; 1761 struct scsi_mode_select cmd; 1762 struct scsi_select { 1763 struct scsi_mode_header header; 1764 struct scsi_blk_desc blk_desc; 1765 u_char sense_data[MAX_PAGE_0_SIZE]; 1766 } scsi_select; 1767 struct scsipi_link *sc_link = st->sc_link; 1768 1769 scsi_select_len = 12 + st->page_0_size; 1770 1771 /* 1772 * This quirk deals with drives that have only one valid mode 1773 * and think this gives them license to reject all mode selects, 1774 * even if the selected mode is the one that is supported. 1775 */ 1776 if (st->quirks & ST_Q_UNIMODAL) { 1777 SC_DEBUG(sc_link, SDEV_DB3, 1778 ("not setting density 0x%x blksize 0x%x\n", 1779 st->density, st->blksize)); 1780 return (0); 1781 } 1782 1783 /* 1784 * Set up for a mode select 1785 */ 1786 bzero(&cmd, sizeof(cmd)); 1787 cmd.opcode = SCSI_MODE_SELECT; 1788 cmd.length = scsi_select_len; 1789 1790 bzero(&scsi_select, scsi_select_len); 1791 scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc); 1792 scsi_select.header.dev_spec &= ~SMH_DSP_BUFF_MODE; 1793 scsi_select.blk_desc.density = st->density; 1794 if (st->flags & ST_DONTBUFFER) 1795 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF; 1796 else 1797 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1798 if (st->flags & ST_FIXEDBLOCKS) 1799 _lto3b(st->blksize, scsi_select.blk_desc.blklen); 1800 if (st->page_0_size) 1801 bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); 1802 1803 /* 1804 * do the command 1805 */ 1806 return (scsipi_command(sc_link, (struct scsipi_generic *)&cmd, 1807 sizeof(cmd), (u_char *)&scsi_select, scsi_select_len, 1808 ST_RETRIES, ST_CTL_TIME, NULL, 1809 flags | XS_CTL_DATA_OUT | XS_CTL_DATA_ONSTACK)); 1810 } 1811 1812 int 1813 st_cmprss(st, onoff) 1814 struct st_softc *st; 1815 int onoff; 1816 { 1817 u_int scsi_dlen; 1818 struct scsi_mode_select mcmd; 1819 struct scsi_mode_sense scmd; 1820 struct scsi_select { 1821 struct scsi_mode_header header; 1822 struct scsi_blk_desc blk_desc; 1823 u_char pdata[max(sizeof(struct scsi_tape_dev_conf_page), 1824 sizeof(struct scsi_tape_dev_compression_page))]; 1825 } scsi_pdata; 1826 struct scsi_tape_dev_conf_page *ptr; 1827 struct scsi_tape_dev_compression_page *cptr; 1828 struct scsipi_link *sc_link = st->sc_link; 1829 int error, ison, flags; 1830 1831 scsi_dlen = sizeof(scsi_pdata); 1832 bzero(&scsi_pdata, scsi_dlen); 1833 1834 /* 1835 * Set up for a mode sense. 1836 * Do DATA COMPRESSION page first. 1837 */ 1838 bzero(&scmd, sizeof(scmd)); 1839 scmd.opcode = SCSI_MODE_SENSE; 1840 scmd.page = SMS_PAGE_CTRL_CURRENT | 0xf; 1841 scmd.length = scsi_dlen; 1842 1843 flags = XS_CTL_SILENT; 1844 1845 /* 1846 * Do the MODE SENSE command... 1847 */ 1848 again: 1849 bzero(&scsi_pdata, scsi_dlen); 1850 error = scsipi_command(sc_link, 1851 (struct scsipi_generic *)&scmd, sizeof(scmd), 1852 (u_char *)&scsi_pdata, scsi_dlen, 1853 ST_RETRIES, ST_CTL_TIME, NULL, 1854 flags | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK); 1855 1856 if (error) { 1857 if (scmd.byte2 != SMS_DBD) { 1858 scmd.byte2 = SMS_DBD; 1859 goto again; 1860 } 1861 /* 1862 * Try a different page? 1863 */ 1864 if (scmd.page == (SMS_PAGE_CTRL_CURRENT | 0xf)) { 1865 scmd.page = SMS_PAGE_CTRL_CURRENT | 0x10; 1866 scmd.byte2 = 0; 1867 goto again; 1868 } 1869 return (error); 1870 } 1871 1872 if (scsi_pdata.header.blk_desc_len) 1873 ptr = (struct scsi_tape_dev_conf_page *) scsi_pdata.pdata; 1874 else 1875 ptr = (struct scsi_tape_dev_conf_page *) &scsi_pdata.blk_desc; 1876 1877 if ((scmd.page & SMS_PAGE_CODE) == 0xf) { 1878 cptr = (struct scsi_tape_dev_compression_page *) ptr; 1879 ison = (cptr->dce_dcc & DCP_DCE) != 0; 1880 if (onoff) 1881 cptr->dce_dcc |= DCP_DCE; 1882 else 1883 cptr->dce_dcc &= ~DCP_DCE; 1884 cptr->pagecode &= ~0x80; 1885 } else { 1886 ison = (ptr->sel_comp_alg != 0); 1887 if (onoff) 1888 ptr->sel_comp_alg = 1; 1889 else 1890 ptr->sel_comp_alg = 0; 1891 ptr->pagecode &= ~0x80; 1892 ptr->byte2 = 0; 1893 ptr->active_partition = 0; 1894 ptr->wb_full_ratio = 0; 1895 ptr->rb_empty_ratio = 0; 1896 ptr->byte8 &= ~0x30; 1897 ptr->gap_size = 0; 1898 ptr->byte10 &= ~0xe7; 1899 ptr->ew_bufsize[0] = 0; 1900 ptr->ew_bufsize[1] = 0; 1901 ptr->ew_bufsize[2] = 0; 1902 ptr->reserved = 0; 1903 } 1904 onoff = onoff ? 1 : 0; 1905 /* 1906 * There might be a virtue in actually doing the MODE SELECTS, 1907 * but let's not clog the bus over it. 1908 */ 1909 if (onoff == ison) 1910 return (0); 1911 1912 /* 1913 * Set up for a mode select 1914 */ 1915 1916 scsi_pdata.header.data_length = 0; 1917 scsi_pdata.header.medium_type = 0; 1918 if ((st->flags & ST_DONTBUFFER) == 0) 1919 scsi_pdata.header.dev_spec = SMH_DSP_BUFF_MODE_ON; 1920 else 1921 scsi_pdata.header.dev_spec = 0; 1922 1923 bzero(&mcmd, sizeof(mcmd)); 1924 mcmd.opcode = SCSI_MODE_SELECT; 1925 mcmd.byte2 = SMS_PF; 1926 mcmd.length = scsi_dlen; 1927 if (scsi_pdata.header.blk_desc_len) { 1928 scsi_pdata.blk_desc.density = 0; 1929 scsi_pdata.blk_desc.nblocks[0] = 0; 1930 scsi_pdata.blk_desc.nblocks[1] = 0; 1931 scsi_pdata.blk_desc.nblocks[2] = 0; 1932 } 1933 1934 /* 1935 * Do the command 1936 */ 1937 error = scsipi_command(sc_link, 1938 (struct scsipi_generic *)&mcmd, sizeof(mcmd), 1939 (u_char *)&scsi_pdata, scsi_dlen, 1940 ST_RETRIES, ST_CTL_TIME, NULL, 1941 flags | XS_CTL_DATA_OUT | XS_CTL_DATA_ONSTACK); 1942 1943 if (error && (scmd.page & SMS_PAGE_CODE) == 0xf) { 1944 /* 1945 * Try DEVICE CONFIGURATION page. 1946 */ 1947 scmd.page = SMS_PAGE_CTRL_CURRENT | 0x10; 1948 goto again; 1949 } 1950 return (error); 1951 } 1952 /* 1953 * issue an erase command 1954 */ 1955 int 1956 st_erase(st, full, flags) 1957 struct st_softc *st; 1958 int full, flags; 1959 { 1960 int tmo; 1961 struct scsi_erase cmd; 1962 1963 /* 1964 * Full erase means set LONG bit in erase command, which asks 1965 * the drive to erase the entire unit. Without this bit, we're 1966 * asking the drive to write an erase gap. 1967 */ 1968 bzero(&cmd, sizeof(cmd)); 1969 cmd.opcode = ERASE; 1970 if (full) { 1971 cmd.byte2 = SE_LONG; 1972 tmo = ST_SPC_TIME; 1973 } else { 1974 tmo = ST_IO_TIME; 1975 } 1976 1977 /* 1978 * XXX We always do this asynchronously, for now, unless the device 1979 * has the ST_Q_ERASE_NOIMM quirk. How long should we wait if we 1980 * want to (eventually) to it synchronously? 1981 */ 1982 if ((st->quirks & ST_Q_ERASE_NOIMM) == 0) 1983 cmd.byte2 |= SE_IMMED; 1984 1985 return (scsipi_command(st->sc_link, 1986 (struct scsipi_generic *)&cmd, sizeof(cmd), 1987 0, 0, ST_RETRIES, tmo, NULL, flags)); 1988 } 1989 1990 /* 1991 * skip N blocks/filemarks/seq filemarks/eom 1992 */ 1993 int 1994 st_space(st, number, what, flags) 1995 struct st_softc *st; 1996 u_int what; 1997 int flags; 1998 int number; 1999 { 2000 struct scsi_space cmd; 2001 int error; 2002 2003 switch (what) { 2004 case SP_BLKS: 2005 if (st->flags & ST_PER_ACTION) { 2006 if (number > 0) { 2007 st->flags &= ~ST_PER_ACTION; 2008 return (EIO); 2009 } else if (number < 0) { 2010 if (st->flags & ST_AT_FILEMARK) { 2011 /* 2012 * Handling of ST_AT_FILEMARK 2013 * in st_space will fill in the 2014 * right file mark count. 2015 */ 2016 error = st_space(st, 0, SP_FILEMARKS, 2017 flags); 2018 if (error) 2019 return (error); 2020 } 2021 if (st->flags & ST_BLANK_READ) { 2022 st->flags &= ~ST_BLANK_READ; 2023 return (EIO); 2024 } 2025 st->flags &= ~(ST_EIO_PENDING|ST_EOM_PENDING); 2026 } 2027 } 2028 break; 2029 case SP_FILEMARKS: 2030 if (st->flags & ST_EIO_PENDING) { 2031 if (number > 0) { 2032 /* pretend we just discovered the error */ 2033 st->flags &= ~ST_EIO_PENDING; 2034 return (EIO); 2035 } else if (number < 0) { 2036 /* back away from the error */ 2037 st->flags &= ~ST_EIO_PENDING; 2038 } 2039 } 2040 if (st->flags & ST_AT_FILEMARK) { 2041 st->flags &= ~ST_AT_FILEMARK; 2042 number--; 2043 } 2044 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 2045 /* back away from unwritten tape */ 2046 st->flags &= ~ST_BLANK_READ; 2047 number++; /* XXX dubious */ 2048 } 2049 break; 2050 case SP_EOM: 2051 if (st->flags & ST_EOM_PENDING) { 2052 /* we're already there */ 2053 st->flags &= ~ST_EOM_PENDING; 2054 return (0); 2055 } 2056 if (st->flags & ST_EIO_PENDING) { 2057 /* pretend we just discovered the error */ 2058 st->flags &= ~ST_EIO_PENDING; 2059 return (EIO); 2060 } 2061 if (st->flags & ST_AT_FILEMARK) 2062 st->flags &= ~ST_AT_FILEMARK; 2063 break; 2064 } 2065 if (number == 0) 2066 return (0); 2067 2068 bzero(&cmd, sizeof(cmd)); 2069 cmd.opcode = SPACE; 2070 cmd.byte2 = what; 2071 _lto3b(number, cmd.number); 2072 2073 return (scsipi_command(st->sc_link, 2074 (struct scsipi_generic *)&cmd, sizeof(cmd), 2075 0, 0, 0, ST_SPC_TIME, NULL, flags)); 2076 } 2077 2078 /* 2079 * write N filemarks 2080 */ 2081 int 2082 st_write_filemarks(st, number, flags) 2083 struct st_softc *st; 2084 int flags; 2085 int number; 2086 { 2087 struct scsi_write_filemarks cmd; 2088 2089 /* 2090 * It's hard to write a negative number of file marks. 2091 * Don't try. 2092 */ 2093 if (number < 0) 2094 return (EINVAL); 2095 switch (number) { 2096 case 0: /* really a command to sync the drive's buffers */ 2097 break; 2098 case 1: 2099 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 2100 st->flags &= ~ST_WRITTEN; 2101 else 2102 st->flags |= ST_FM_WRITTEN; 2103 st->flags &= ~ST_PER_ACTION; 2104 break; 2105 default: 2106 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 2107 } 2108 2109 bzero(&cmd, sizeof(cmd)); 2110 cmd.opcode = WRITE_FILEMARKS; 2111 _lto3b(number, cmd.number); 2112 2113 return (scsipi_command(st->sc_link, 2114 (struct scsipi_generic *)&cmd, sizeof(cmd), 2115 0, 0, 0, ST_IO_TIME * 4, NULL, flags)); 2116 } 2117 2118 /* 2119 * Make sure the right number of file marks is on tape if the 2120 * tape has been written. If the position argument is true, 2121 * leave the tape positioned where it was originally. 2122 * 2123 * nmarks returns the number of marks to skip (or, if position 2124 * true, which were skipped) to get back original position. 2125 */ 2126 int 2127 st_check_eod(st, position, nmarks, flags) 2128 struct st_softc *st; 2129 boolean position; 2130 int *nmarks; 2131 int flags; 2132 { 2133 int error; 2134 2135 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 2136 default: 2137 *nmarks = 0; 2138 return (0); 2139 case ST_WRITTEN: 2140 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 2141 *nmarks = 1; 2142 break; 2143 case ST_WRITTEN | ST_2FM_AT_EOD: 2144 *nmarks = 2; 2145 } 2146 error = st_write_filemarks(st, *nmarks, flags); 2147 if (position && !error) 2148 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 2149 return (error); 2150 } 2151 2152 /* 2153 * load/unload/retension 2154 */ 2155 int 2156 st_load(st, type, flags) 2157 struct st_softc *st; 2158 u_int type; 2159 int flags; 2160 { 2161 int error; 2162 struct scsi_load cmd; 2163 2164 if (type != LD_LOAD) { 2165 int nmarks; 2166 2167 error = st_check_eod(st, FALSE, &nmarks, flags); 2168 if (error) { 2169 printf("%s: failed to write closing filemarks at " 2170 "unload, errno=%d\n", st->sc_dev.dv_xname, error); 2171 return (error); 2172 } 2173 } 2174 if (st->quirks & ST_Q_IGNORE_LOADS) { 2175 if (type == LD_LOAD) { 2176 /* 2177 * If we ignore loads, at least we should try a rewind. 2178 */ 2179 return st_rewind(st, 0, flags); 2180 } 2181 /* otherwise, we should do what's asked of us */ 2182 } 2183 2184 bzero(&cmd, sizeof(cmd)); 2185 cmd.opcode = LOAD; 2186 cmd.how = type; 2187 2188 error = scsipi_command(st->sc_link, 2189 (struct scsipi_generic *)&cmd, sizeof(cmd), 2190 0, 0, ST_RETRIES, ST_SPC_TIME, NULL, flags); 2191 if (error) { 2192 printf("%s: error %d in st_load (op %d)\n", 2193 st->sc_dev.dv_xname, error, type); 2194 } 2195 return (error); 2196 } 2197 2198 /* 2199 * Rewind the device 2200 */ 2201 int 2202 st_rewind(st, immediate, flags) 2203 struct st_softc *st; 2204 u_int immediate; 2205 int flags; 2206 { 2207 struct scsi_rewind cmd; 2208 int error; 2209 int nmarks; 2210 2211 error = st_check_eod(st, FALSE, &nmarks, flags); 2212 if (error) { 2213 printf("%s: failed to write closing filemarks at " 2214 "rewind, errno=%d\n", st->sc_dev.dv_xname, error); 2215 return (error); 2216 } 2217 st->flags &= ~ST_PER_ACTION; 2218 2219 bzero(&cmd, sizeof(cmd)); 2220 cmd.opcode = REWIND; 2221 cmd.byte2 = immediate; 2222 2223 error = scsipi_command(st->sc_link, 2224 (struct scsipi_generic *)&cmd, sizeof(cmd), 0, 0, ST_RETRIES, 2225 immediate ? ST_CTL_TIME: ST_SPC_TIME, NULL, flags); 2226 if (error) { 2227 printf("%s: error %d trying to rewind\n", 2228 st->sc_dev.dv_xname, error); 2229 } 2230 return (error); 2231 } 2232 2233 int 2234 st_rdpos(st, hard, blkptr) 2235 struct st_softc *st; 2236 int hard; 2237 u_int32_t *blkptr; 2238 { 2239 int error; 2240 u_int8_t posdata[20]; 2241 struct scsi_tape_read_position cmd; 2242 2243 /* 2244 * First flush any pending writes... 2245 */ 2246 error = st_write_filemarks(st, 0, XS_CTL_SILENT); 2247 2248 /* 2249 * The latter case is for 'write protected' tapes 2250 * which are too stupid to recognize a zero count 2251 * for writing filemarks as a no-op. 2252 */ 2253 if (error != 0 && error != EACCES && error != EROFS) 2254 return (error); 2255 2256 bzero(&cmd, sizeof(cmd)); 2257 bzero(&posdata, sizeof(posdata)); 2258 cmd.opcode = READ_POSITION; 2259 if (hard) 2260 cmd.byte1 = 1; 2261 2262 error = scsipi_command(st->sc_link, 2263 (struct scsipi_generic *)&cmd, sizeof(cmd), (u_char *)&posdata, 2264 sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL, 2265 XS_CTL_SILENT | XS_CTL_DATA_IN | XS_CTL_DATA_ONSTACK); 2266 2267 if (error == 0) { 2268 #if 0 2269 printf("posdata:"); 2270 for (hard = 0; hard < sizeof(posdata); hard++) 2271 printf("%02x ", posdata[hard] & 0xff); 2272 printf("\n"); 2273 #endif 2274 if (posdata[0] & 0x4) /* Block Position Unknown */ 2275 error = EINVAL; 2276 else 2277 *blkptr = _4btol(&posdata[4]); 2278 } 2279 return (error); 2280 } 2281 2282 int 2283 st_setpos(st, hard, blkptr) 2284 struct st_softc *st; 2285 int hard; 2286 u_int32_t *blkptr; 2287 { 2288 int error; 2289 struct scsi_tape_locate cmd; 2290 2291 /* 2292 * First flush any pending writes. Strictly speaking, 2293 * we're not supposed to have to worry about this, 2294 * but let's be untrusting. 2295 */ 2296 error = st_write_filemarks(st, 0, XS_CTL_SILENT); 2297 2298 /* 2299 * The latter case is for 'write protected' tapes 2300 * which are too stupid to recognize a zero count 2301 * for writing filemarks as a no-op. 2302 */ 2303 if (error != 0 && error != EACCES && error != EROFS) 2304 return (error); 2305 2306 bzero(&cmd, sizeof(cmd)); 2307 cmd.opcode = LOCATE; 2308 if (hard) 2309 cmd.byte2 = 1 << 2; 2310 _lto4b(*blkptr, cmd.blkaddr); 2311 error = scsipi_command(st->sc_link, 2312 (struct scsipi_generic *)&cmd, sizeof(cmd), 2313 NULL, 0, ST_RETRIES, ST_SPC_TIME, NULL, 0); 2314 /* 2315 * XXX: Note file && block number position now unknown (if 2316 * XXX: these things ever start being maintained in this driver) 2317 */ 2318 return (error); 2319 } 2320 2321 2322 /* 2323 * Look at the returned sense and act on the error and determine 2324 * the unix error number to pass back..., 0 (== report no error), 2325 * -1 = retry the operation, -2 continue error processing. 2326 */ 2327 int 2328 st_interpret_sense(xs) 2329 struct scsipi_xfer *xs; 2330 { 2331 struct scsipi_link *sc_link = xs->sc_link; 2332 struct scsipi_sense_data *sense = &xs->sense.scsi_sense; 2333 struct buf *bp = xs->bp; 2334 struct st_softc *st = sc_link->device_softc; 2335 int retval = SCSIRET_CONTINUE; 2336 int doprint = ((xs->xs_control & XS_CTL_SILENT) == 0); 2337 u_int8_t key; 2338 int32_t info; 2339 2340 /* 2341 * If it isn't a extended or extended/deferred error, let 2342 * the generic code handle it. 2343 */ 2344 if ((sense->error_code & SSD_ERRCODE) != 0x70 && 2345 (sense->error_code & SSD_ERRCODE) != 0x71) { /* DEFFERRED */ 2346 return (retval); 2347 } 2348 2349 if (sense->error_code & SSD_ERRCODE_VALID) 2350 info = _4btol(sense->info); 2351 else 2352 info = xs->datalen; /* bad choice if fixed blocks */ 2353 key = sense->flags & SSD_KEY; 2354 st->mt_erreg = key; 2355 st->asc = sense->add_sense_code; 2356 st->ascq = sense->add_sense_code_qual; 2357 st->mt_resid = (short) info; 2358 2359 /* 2360 * If the device is not open yet, let generic handle 2361 */ 2362 if ((sc_link->flags & SDEV_OPEN) == 0) { 2363 return (retval); 2364 } 2365 2366 2367 if (st->flags & ST_FIXEDBLOCKS) { 2368 xs->resid = info * st->blksize; 2369 if (sense->flags & SSD_EOM) { 2370 if ((st->flags & ST_EARLYWARN) == 0) 2371 st->flags |= ST_EIO_PENDING; 2372 st->flags |= ST_EOM_PENDING; 2373 if (bp) 2374 bp->b_resid = xs->resid; 2375 } 2376 if (sense->flags & SSD_FILEMARK) { 2377 st->flags |= ST_AT_FILEMARK; 2378 if (bp) 2379 bp->b_resid = xs->resid; 2380 } 2381 if (sense->flags & SSD_ILI) { 2382 st->flags |= ST_EIO_PENDING; 2383 if (bp) 2384 bp->b_resid = xs->resid; 2385 if (sense->error_code & SSD_ERRCODE_VALID && 2386 (xs->xs_control & XS_CTL_SILENT) == 0) 2387 printf("%s: block wrong size, %d blocks " 2388 "residual\n", st->sc_dev.dv_xname, info); 2389 2390 /* 2391 * This quirk code helps the drive read 2392 * the first tape block, regardless of 2393 * format. That is required for these 2394 * drives to return proper MODE SENSE 2395 * information. 2396 */ 2397 if ((st->quirks & ST_Q_SENSE_HELP) && 2398 !(sc_link->flags & SDEV_MEDIA_LOADED)) 2399 st->blksize -= 512; 2400 } 2401 /* 2402 * If data wanted and no data was tranfered, do it immediatly 2403 */ 2404 if (xs->datalen && xs->resid >= xs->datalen) { 2405 if (st->flags & ST_EIO_PENDING) 2406 return (EIO); 2407 if (st->flags & ST_AT_FILEMARK) { 2408 if (bp) 2409 bp->b_resid = xs->resid; 2410 return (SCSIRET_NOERROR); 2411 } 2412 } 2413 } else { /* must be variable mode */ 2414 if (sense->flags & SSD_EOM) { 2415 /* 2416 * The current semantics of this 2417 * driver requires EOM detection 2418 * to return EIO unless early 2419 * warning detection is enabled 2420 * for variable mode (this is always 2421 * on for fixed block mode). 2422 */ 2423 if (st->flags & ST_EARLYWARN) { 2424 st->flags |= ST_EOM_PENDING; 2425 retval = SCSIRET_NOERROR; 2426 } else { 2427 retval = EIO; 2428 } 2429 2430 /* 2431 * If it's an unadorned EOM detection, 2432 * suppress printing an error. 2433 */ 2434 if (key == SKEY_NO_SENSE) { 2435 doprint = 0; 2436 } 2437 } else if (sense->flags & SSD_FILEMARK) { 2438 retval = SCSIRET_NOERROR; 2439 } else if (sense->flags & SSD_ILI) { 2440 if (info < 0) { 2441 /* 2442 * The tape record was bigger than the read 2443 * we issued. 2444 */ 2445 if ((xs->xs_control & XS_CTL_SILENT) == 0) { 2446 printf("%s: %d-byte tape record too big" 2447 " for %d-byte user buffer\n", 2448 st->sc_dev.dv_xname, 2449 xs->datalen - info, xs->datalen); 2450 } 2451 retval = EIO; 2452 } else { 2453 retval = SCSIRET_NOERROR; 2454 } 2455 } 2456 xs->resid = info; 2457 if (bp) 2458 bp->b_resid = info; 2459 } 2460 2461 #ifndef SCSIDEBUG 2462 if (retval == SCSIRET_NOERROR && key == SKEY_NO_SENSE) { 2463 doprint = 0; 2464 } 2465 #endif 2466 if (key == SKEY_BLANK_CHECK) { 2467 /* 2468 * This quirk code helps the drive read the 2469 * first tape block, regardless of format. That 2470 * is required for these drives to return proper 2471 * MODE SENSE information. 2472 */ 2473 if ((st->quirks & ST_Q_SENSE_HELP) && 2474 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 2475 /* still starting */ 2476 st->blksize -= 512; 2477 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 2478 st->flags |= ST_BLANK_READ; 2479 xs->resid = xs->datalen; 2480 if (bp) { 2481 bp->b_resid = xs->resid; 2482 /* return an EOF */ 2483 } 2484 retval = SCSIRET_NOERROR; 2485 } 2486 } 2487 2488 /* 2489 * If generic sense processing will continue, we should not 2490 * print sense info here. 2491 */ 2492 if (retval == SCSIRET_CONTINUE) 2493 doprint = 0; 2494 2495 if (doprint) { 2496 #ifdef SCSIVERBOSE 2497 scsipi_print_sense(xs, 0); 2498 #else 2499 xs->sc_link->sc_print_addr(xs->sc_link); 2500 printf("Sense Key 0x%02x", key); 2501 if ((sense->error_code & SSD_ERRCODE_VALID) != 0) { 2502 switch (key) { 2503 case SKEY_NOT_READY: 2504 case SKEY_ILLEGAL_REQUEST: 2505 case SKEY_UNIT_ATTENTION: 2506 case SKEY_WRITE_PROTECT: 2507 break; 2508 case SKEY_BLANK_CHECK: 2509 printf(", requested size: %d (decimal)", info); 2510 break; 2511 case SKEY_ABORTED_COMMAND: 2512 if (xs->retries) 2513 printf(", retrying"); 2514 printf(", cmd 0x%x, info 0x%x", 2515 xs->cmd->opcode, info); 2516 break; 2517 default: 2518 printf(", info = %d (decimal)", info); 2519 } 2520 } 2521 if (sense->extra_len != 0) { 2522 int n; 2523 printf(", data ="); 2524 for (n = 0; n < sense->extra_len; n++) 2525 printf(" %02x", sense->cmd_spec_info[n]); 2526 } 2527 printf("\n"); 2528 #endif 2529 } 2530 return (retval); 2531 } 2532 2533 /* 2534 * The quirk here is that the drive returns some value to st_mode_sense 2535 * incorrectly until the tape has actually passed by the head. 2536 * 2537 * The method is to set the drive to large fixed-block state (user-specified 2538 * density and 1024-byte blocks), then read and rewind to get it to sense the 2539 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 2540 * work, as a last resort, try variable- length blocks. The result will be 2541 * the ability to do an accurate st_mode_sense. 2542 * 2543 * We know we can do a rewind because we just did a load, which implies rewind. 2544 * Rewind seems preferable to space backward if we have a virgin tape. 2545 * 2546 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 2547 * error processing, both part of st_interpret_sense. 2548 */ 2549 int 2550 st_touch_tape(st) 2551 struct st_softc *st; 2552 { 2553 char *buf; 2554 int readsize; 2555 int error; 2556 2557 buf = malloc(1024, M_TEMP, M_NOWAIT); 2558 if (buf == NULL) 2559 return (ENOMEM); 2560 2561 if ((error = st_mode_sense(st, 0)) != 0) 2562 goto bad; 2563 2564 /* 2565 * If the block size is already known from the 2566 * sense data, use it. Else start probing at 1024. 2567 */ 2568 if (st->media_blksize > 0) 2569 st->blksize = st->media_blksize; 2570 else 2571 st->blksize = 1024; 2572 2573 do { 2574 switch (st->blksize) { 2575 case 512: 2576 case 1024: 2577 readsize = st->blksize; 2578 st->flags |= ST_FIXEDBLOCKS; 2579 break; 2580 default: 2581 readsize = 1; 2582 st->flags &= ~ST_FIXEDBLOCKS; 2583 } 2584 if ((error = st_mode_select(st, XS_CTL_SILENT)) != 0) { 2585 /* 2586 * The device did not agree with the proposed 2587 * block size. If we exhausted our options, 2588 * return failure, else try another. 2589 */ 2590 if (readsize == 1) 2591 goto bad; 2592 st->blksize -= 512; 2593 continue; 2594 } 2595 st_read(st, buf, readsize, XS_CTL_SILENT); /* XXX */ 2596 if ((error = st_rewind(st, 0, 0)) != 0) { 2597 bad: free(buf, M_TEMP); 2598 return (error); 2599 } 2600 } while (readsize != 1 && readsize > st->blksize); 2601 2602 free(buf, M_TEMP); 2603 return (0); 2604 } 2605 2606 int 2607 stdump(dev, blkno, va, size) 2608 dev_t dev; 2609 daddr_t blkno; 2610 caddr_t va; 2611 size_t size; 2612 { 2613 2614 /* Not implemented. */ 2615 return (ENXIO); 2616 } 2617