sys/bus/cam/scsi/scsi_sa.c

   1 /*
   2  * $FreeBSD: src/sys/cam/scsi/scsi_sa.c,v 1.45.2.13 2002/12/17 17:08:50 trhodes Exp $
   3  * $DragonFly: src/sys/bus/cam/scsi/scsi_sa.c,v 1.17 2006/04/30 17:22:15 dillon Exp $
   4  *
   5  * Implementation of SCSI Sequential Access Peripheral driver for CAM.
   6  *
   7  * Copyright (c) 1999, 2000 Matthew Jacob
   8  * All rights reserved.
   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  *    without modification, immediately at the beginning of the file.
  16  * 2. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  23  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/queue.h>
  35 #ifdef _KERNEL
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #endif
  39 #include <sys/types.h>
  40 #ifdef _KERNEL
  41 #include <sys/buf.h>
  42 #include <sys/malloc.h>
  43 #endif
  44 #include <sys/mtio.h>
  45 #include <sys/conf.h>
  46 #ifdef _KERNEL
  47 #include <sys/proc.h>
  48 #include <sys/buf2.h>
  49 #include <sys/thread2.h>
  50 #endif
  51 #include <sys/devicestat.h>
  52 #include <machine/limits.h>
  53
  54 #ifndef _KERNEL
  55 #include <stdio.h>
  56 #include <string.h>
  57 #endif
  58
  59 #include "../cam.h"
  60 #include "../cam_ccb.h"
  61 #include "../cam_extend.h"
  62 #include "../cam_periph.h"
  63 #include "../cam_xpt_periph.h"
  64 #include "../cam_debug.h"
  65
  66 #include "scsi_all.h"
  67 #include "scsi_message.h"
  68 #include "scsi_sa.h"
  69
  70 #ifdef _KERNEL
  71
  72 #include <opt_sa.h>
  73
  74 #ifndef SA_IO_TIMEOUT
  75 #define SA_IO_TIMEOUT           4
  76 #endif
  77 #ifndef SA_SPACE_TIMEOUT
  78 #define SA_SPACE_TIMEOUT        1 * 60
  79 #endif
  80 #ifndef SA_REWIND_TIMEOUT
  81 #define SA_REWIND_TIMEOUT       2 * 60
  82 #endif
  83 #ifndef SA_ERASE_TIMEOUT
  84 #define SA_ERASE_TIMEOUT        4 * 60
  85 #endif
  86
  87 #define SCSIOP_TIMEOUT          (60 * 1000)     /* not an option */
  88
  89 #define IO_TIMEOUT              (SA_IO_TIMEOUT * 60 * 1000)
  90 #define REWIND_TIMEOUT          (SA_REWIND_TIMEOUT * 60 * 1000)
  91 #define ERASE_TIMEOUT           (SA_ERASE_TIMEOUT * 60 * 1000)
  92 #define SPACE_TIMEOUT           (SA_SPACE_TIMEOUT * 60 * 1000)
  93
  94 /*
  95  * Additional options that can be set for config: SA_1FM_AT_EOT
  96  */
  97
  98 #ifndef UNUSED_PARAMETER
  99 #define UNUSED_PARAMETER(x)     x = x
 100 #endif
 101
 102 #define QFRLS(ccb)      \
 103         if (((ccb)->ccb_h.status & CAM_DEV_QFRZN) != 0) \
 104                 cam_release_devq((ccb)->ccb_h.path, 0, 0, 0, FALSE)
 105
 106 /*
 107  * Driver states
 108  */
 109
 110
 111 typedef enum {
 112         SA_STATE_NORMAL, SA_STATE_ABNORMAL
 113 } sa_state;
 114
 115 #define ccb_pflags      ppriv_field0
 116 #define ccb_bio         ppriv_ptr1
 117
 118 #define SA_CCB_BUFFER_IO        0x0
 119 #define SA_CCB_WAITING          0x1
 120 #define SA_CCB_TYPEMASK         0x1
 121 #define SA_POSITION_UPDATED     0x2
 122
 123 #define Set_CCB_Type(x, type)                           \
 124         x->ccb_h.ccb_pflags &= ~SA_CCB_TYPEMASK;        \
 125         x->ccb_h.ccb_pflags |= type
 126
 127 #define CCB_Type(x)     (x->ccb_h.ccb_pflags & SA_CCB_TYPEMASK)
 128
 129
 130
 131 typedef enum {
 132         SA_FLAG_OPEN            = 0x0001,
 133         SA_FLAG_FIXED           = 0x0002,
 134         SA_FLAG_TAPE_LOCKED     = 0x0004,
 135         SA_FLAG_TAPE_MOUNTED    = 0x0008,
 136         SA_FLAG_TAPE_WP         = 0x0010,
 137         SA_FLAG_TAPE_WRITTEN    = 0x0020,
 138         SA_FLAG_EOM_PENDING     = 0x0040,
 139         SA_FLAG_EIO_PENDING     = 0x0080,
 140         SA_FLAG_EOF_PENDING     = 0x0100,
 141         SA_FLAG_ERR_PENDING     = (SA_FLAG_EOM_PENDING|SA_FLAG_EIO_PENDING|
 142                                    SA_FLAG_EOF_PENDING),
 143         SA_FLAG_INVALID         = 0x0200,
 144         SA_FLAG_COMP_ENABLED    = 0x0400,
 145         SA_FLAG_COMP_SUPP       = 0x0800,
 146         SA_FLAG_COMP_UNSUPP     = 0x1000,
 147         SA_FLAG_TAPE_FROZEN     = 0x2000
 148 } sa_flags;
 149
 150 typedef enum {
 151         SA_MODE_REWIND          = 0x00,
 152         SA_MODE_NOREWIND        = 0x01,
 153         SA_MODE_OFFLINE         = 0x02
 154 } sa_mode;
 155
 156 typedef enum {
 157         SA_PARAM_NONE           = 0x00,
 158         SA_PARAM_BLOCKSIZE      = 0x01,
 159         SA_PARAM_DENSITY        = 0x02,
 160         SA_PARAM_COMPRESSION    = 0x04,
 161         SA_PARAM_BUFF_MODE      = 0x08,
 162         SA_PARAM_NUMBLOCKS      = 0x10,
 163         SA_PARAM_WP             = 0x20,
 164         SA_PARAM_SPEED          = 0x40,
 165         SA_PARAM_ALL            = 0x7f
 166 } sa_params;
 167
 168 typedef enum {
 169         SA_QUIRK_NONE           = 0x00,
 170         SA_QUIRK_NOCOMP         = 0x01, /* Can't deal with compression at all */
 171         SA_QUIRK_FIXED          = 0x02, /* Force fixed mode */
 172         SA_QUIRK_VARIABLE       = 0x04, /* Force variable mode */
 173         SA_QUIRK_2FM            = 0x08, /* Needs Two File Marks at EOD */
 174         SA_QUIRK_1FM            = 0x10, /* No more than 1 File Mark at EOD */
 175         SA_QUIRK_NODREAD        = 0x20, /* Don't try and dummy read density */
 176         SA_QUIRK_NO_MODESEL     = 0x40, /* Don't do mode select at all */
 177         SA_QUIRK_NO_CPAGE       = 0x80  /* Don't use DEVICE COMPRESSION page */
 178 } sa_quirks;
 179
 180 /* units are bits 4-7, 16-21 (1024 units) */
 181 #define SAUNIT(DEV) \
 182         (((minor(DEV) & 0xF0) >> 4) |  ((minor(DEV) & 0x3f0000) >> 16))
 183
 184 #define SAMODE(z) ((minor(z) & 0x3))
 185 #define SADENSITY(z) (((minor(z) >> 2) & 0x3))
 186 #define SA_IS_CTRL(z) (minor(z) & (1 << 29))
 187
 188 #define SA_NOT_CTLDEV   0
 189 #define SA_CTLDEV       1
 190
 191 #define SA_ATYPE_R      0
 192 #define SA_ATYPE_NR     1
 193 #define SA_ATYPE_ER     2
 194
 195 #define SAMINOR(ctl, unit, mode, access) \
 196         ((ctl << 29) | ((unit & 0x3f0) << 16) | ((unit & 0xf) << 4) | \
 197         (mode << 0x2) | (access & 0x3))
 198
 199 #define SA_UNITMASK     SAMINOR(0, -1, 0, 0)
 200 #define SA_UNIT(unit)   SAMINOR(0, unit, 0, 0)
 201
 202 #define SA_NUM_MODES    4
 203
 204 struct sa_softc {
 205         sa_state        state;
 206         sa_flags        flags;
 207         sa_quirks       quirks;
 208         struct          bio_queue_head bio_queue;
 209         int             queue_count;
 210         struct          devstat device_stats;
 211         int             blk_gran;
 212         int             blk_mask;
 213         int             blk_shift;
 214         u_int32_t       max_blk;
 215         u_int32_t       min_blk;
 216         u_int32_t       comp_algorithm;
 217         u_int32_t       saved_comp_algorithm;
 218         u_int32_t       media_blksize;
 219         u_int32_t       last_media_blksize;
 220         u_int32_t       media_numblks;
 221         u_int8_t        media_density;
 222         u_int8_t        speed;
 223         u_int8_t        scsi_rev;
 224         u_int8_t        dsreg;          /* mtio mt_dsreg, redux */
 225         int             buffer_mode;
 226         int             filemarks;
 227         union           ccb saved_ccb;
 228         int             last_resid_was_io;
 229
 230         /*
 231          * Relative to BOT Location.
 232          */
 233         daddr_t         fileno;
 234         daddr_t         blkno;
 235
 236         /*
 237          * Latched Error Info
 238          */
 239         struct {
 240                 struct scsi_sense_data _last_io_sense;
 241                 u_int32_t _last_io_resid;
 242                 u_int8_t _last_io_cdb[CAM_MAX_CDBLEN];
 243                 struct scsi_sense_data _last_ctl_sense;
 244                 u_int32_t _last_ctl_resid;
 245                 u_int8_t _last_ctl_cdb[CAM_MAX_CDBLEN];
 246 #define last_io_sense   errinfo._last_io_sense
 247 #define last_io_resid   errinfo._last_io_resid
 248 #define last_io_cdb     errinfo._last_io_cdb
 249 #define last_ctl_sense  errinfo._last_ctl_sense
 250 #define last_ctl_resid  errinfo._last_ctl_resid
 251 #define last_ctl_cdb    errinfo._last_ctl_cdb
 252         } errinfo;
 253         /*
 254          * Misc other flags/state
 255          */
 256         u_int32_t
 257                                 : 31,
 258                 ctrl_mode       : 1;    /* control device open */
 259 };
 260
 261 struct sa_quirk_entry {
 262         struct scsi_inquiry_pattern inq_pat;    /* matching pattern */
 263         sa_quirks quirks;       /* specific quirk type */
 264         u_int32_t prefblk;      /* preferred blocksize when in fixed mode */
 265 };
 266
 267 static struct sa_quirk_entry sa_quirk_table[] =
 268 {
 269         {
 270                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "OnStream",
 271                   "ADR*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_NODREAD |
 272                    SA_QUIRK_1FM|SA_QUIRK_NO_MODESEL, 32768
 273         },
 274         {
 275                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 276                   "Python 06408*", "*"}, SA_QUIRK_NODREAD, 0
 277         },
 278         {
 279                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 280                   "Python 25601*", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_NODREAD, 0
 281         },
 282         {
 283                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 284                   "Python*", "*"}, SA_QUIRK_NODREAD, 0
 285         },
 286         {
 287                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 288                   "VIPER 150*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 289         },
 290         {
 291                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 292                   "VIPER 2525 25462", "-011"},
 293                   SA_QUIRK_NOCOMP|SA_QUIRK_1FM|SA_QUIRK_NODREAD, 0
 294         },
 295         {
 296                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 297                   "VIPER 2525*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 298         },
 299 #if     0
 300         {
 301                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 302                   "C15*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_NO_CPAGE, 0,
 303         },
 304 #endif
 305         {
 306                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 307                   "C56*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 308         },
 309         {
 310                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 311                   "T20*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 312         },
 313         {
 314                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 315                   "T4000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 316         },
 317         {
 318                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 319                   "HP-88780*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 320         },
 321         {
 322                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
 323                   "*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 324         },
 325         {
 326                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "M4 DATA",
 327                   "123107 SCSI*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 328         },
 329         {       /* jreynold@primenet.com */
 330                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 331                 "STT8000N*", "*"}, SA_QUIRK_1FM, 0
 332         },
 333         {       /* mike@sentex.net */
 334                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 335                 "STT20000*", "*"}, SA_QUIRK_1FM, 0
 336         },
 337         {
 338                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 339                   " TDC 3600", "U07:"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 340         },
 341         {
 342                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 343                   " TDC 3800", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 344         },
 345         {
 346                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 347                   " TDC 4100", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 348         },
 349         {
 350                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 351                   " TDC 4200", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 352         },
 353         {
 354                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 355                   " SLR*", "*"}, SA_QUIRK_1FM, 0
 356         },
 357         {
 358                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 359                   "5525ES*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 360         },
 361         {
 362                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 363                   "51000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 364         }
 365 };
 366
 367 static  d_open_t        saopen;
 368 static  d_close_t       saclose;
 369 static  d_strategy_t    sastrategy;
 370 static  d_ioctl_t       saioctl;
 371 static  periph_init_t   sainit;
 372 static  periph_ctor_t   saregister;
 373 static  periph_oninv_t  saoninvalidate;
 374 static  periph_dtor_t   sacleanup;
 375 static  periph_start_t  sastart;
 376 static  void            saasync(void *callback_arg, u_int32_t code,
 377                                 struct cam_path *path, void *arg);
 378 static  void            sadone(struct cam_periph *periph,
 379                                union ccb *start_ccb);
 380 static  int             saerror(union ccb *ccb, u_int32_t cam_flags,
 381                                 u_int32_t sense_flags);
 382 static int              samarkswanted(struct cam_periph *);
 383 static int              sacheckeod(struct cam_periph *periph);
 384 static int              sagetparams(struct cam_periph *periph,
 385                                     sa_params params_to_get,
 386                                     u_int32_t *blocksize, u_int8_t *density,
 387                                     u_int32_t *numblocks, int *buff_mode,
 388                                     u_int8_t *write_protect, u_int8_t *speed,
 389                                     int *comp_supported, int *comp_enabled,
 390                                     u_int32_t *comp_algorithm,
 391                                     sa_comp_t *comp_page);
 392 static int              sasetparams(struct cam_periph *periph,
 393                                     sa_params params_to_set,
 394                                     u_int32_t blocksize, u_int8_t density,
 395                                     u_int32_t comp_algorithm,
 396                                     u_int32_t sense_flags);
 397 static void             saprevent(struct cam_periph *periph, int action);
 398 static int              sarewind(struct cam_periph *periph);
 399 static int              saspace(struct cam_periph *periph, int count,
 400                                 scsi_space_code code);
 401 static int              samount(struct cam_periph *, int, dev_t);
 402 static int              saretension(struct cam_periph *periph);
 403 static int              sareservereleaseunit(struct cam_periph *periph,
 404                                              int reserve);
 405 static int              saloadunload(struct cam_periph *periph, int load);
 406 static int              saerase(struct cam_periph *periph, int longerase);
 407 static int              sawritefilemarks(struct cam_periph *periph,
 408                                          int nmarks, int setmarks);
 409 static int              sardpos(struct cam_periph *periph, int, u_int32_t *);
 410 static int              sasetpos(struct cam_periph *periph, int, u_int32_t *);
 411
 412
 413 static struct periph_driver sadriver =
 414 {
 415         sainit, "sa",
 416         TAILQ_HEAD_INITIALIZER(sadriver.units), /* generation */ 0
 417 };
 418
 419 DATA_SET(periphdriver_set, sadriver);
 420
 421 /* For 2.2-stable support */
 422 #ifndef D_TAPE
 423 #define D_TAPE 0
 424 #endif
 425
 426 #define SA_CDEV_MAJOR 14
 427
 428 static struct cdevsw sa_cdevsw = {
 429         /* name */      "sa",
 430         /* maj */       SA_CDEV_MAJOR,
 431         /* flags */     D_TAPE,
 432         /* port */      NULL,
 433         /* clone */     NULL,
 434
 435         /* open */      saopen,
 436         /* close */     saclose,
 437         /* read */      physread,
 438         /* write */     physwrite,
 439         /* ioctl */     saioctl,
 440         /* poll */      nopoll,
 441         /* mmap */      nommap,
 442         /* strategy */  sastrategy,
 443         /* dump */      nodump,
 444         /* psize */     nopsize
 445 };
 446
 447 static struct extend_array *saperiphs;
 448
 449 static int
 450 saopen(dev_t dev, int flags, int fmt, struct thread *td)
 451 {
 452         struct cam_periph *periph;
 453         struct sa_softc *softc;
 454         int unit;
 455         int mode;
 456         int density;
 457         int error;
 458
 459         unit = SAUNIT(dev);
 460         mode = SAMODE(dev);
 461         density = SADENSITY(dev);
 462
 463         crit_enter();
 464         periph = cam_extend_get(saperiphs, unit);
 465         if (periph == NULL) {
 466                 crit_exit();
 467                 return (ENXIO);
 468         }
 469         softc = (struct sa_softc *)periph->softc;
 470         if ((error = cam_periph_lock(periph, PCATCH)) != 0) {
 471                 crit_exit();
 472                 return (error);
 473         }
 474         crit_exit();
 475
 476         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 477             ("saopen(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
 478
 479         if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
 480                 cam_periph_unlock(periph);
 481                 return (ENXIO);
 482         }
 483         if (SA_IS_CTRL(dev)) {
 484                 softc->ctrl_mode = 1;
 485                 cam_periph_unlock(periph);
 486                 return (0);
 487         }
 488
 489
 490         if (softc->flags & SA_FLAG_OPEN) {
 491                 error = EBUSY;
 492         } else if (softc->flags & SA_FLAG_INVALID) {
 493                 error = ENXIO;
 494         } else {
 495                 /*
 496                  * The function samount ensures media is loaded and ready.
 497                  * It also does a device RESERVE if the tape isn't yet mounted.
 498                  */
 499                 error = samount(periph, flags, dev);
 500         }
 501
 502         if (error) {
 503                 cam_periph_release(periph);
 504         } else {
 505                 saprevent(periph, PR_PREVENT);
 506                 softc->flags |= SA_FLAG_OPEN;
 507         }
 508         cam_periph_unlock(periph);
 509         return (error);
 510 }
 511
 512 static int
 513 saclose(dev_t dev, int flag, int fmt, struct thread *td)
 514 {
 515         struct  cam_periph *periph;
 516         struct  sa_softc *softc;
 517         int     unit, mode, error, writing, tmp;
 518         int     closedbits = SA_FLAG_OPEN;
 519
 520         unit = SAUNIT(dev);
 521         mode = SAMODE(dev);
 522         periph = cam_extend_get(saperiphs, unit);
 523         if (periph == NULL)
 524                 return (ENXIO);
 525
 526         softc = (struct sa_softc *)periph->softc;
 527
 528         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 529             ("saclose(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
 530
 531
 532         if ((error = cam_periph_lock(periph, 0)) != 0) {
 533                 return (error);
 534         }
 535
 536         if (SA_IS_CTRL(dev)) {
 537                 softc->ctrl_mode = 0;
 538                 cam_periph_release(periph);
 539                 cam_periph_unlock(periph);
 540                 return (0);
 541         }
 542
 543         /*
 544          * Were we writing the tape?
 545          */
 546         writing = (softc->flags & SA_FLAG_TAPE_WRITTEN) != 0;
 547
 548         /*
 549          * See whether or not we need to write filemarks. If this
 550          * fails, we probably have to assume we've lost tape
 551          * position.
 552          */
 553         error = sacheckeod(periph);
 554         if (error) {
 555                 xpt_print_path(periph->path);
 556                 printf("failed to write terminating filemark(s)\n");
 557                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 558         }
 559
 560         /*
 561          * Whatever we end up doing, allow users to eject tapes from here on.
 562          */
 563         saprevent(periph, PR_ALLOW);
 564
 565         /*
 566          * Decide how to end...
 567          */
 568         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
 569                 closedbits |= SA_FLAG_TAPE_FROZEN;
 570         } else switch (mode) {
 571         case SA_MODE_OFFLINE:
 572                 /*
 573                  * An 'offline' close is an unconditional release of
 574                  * frozen && mount conditions, irrespective of whether
 575                  * these operations succeeded. The reason for this is
 576                  * to allow at least some kind of programmatic way
 577                  * around our state getting all fouled up. If somebody
 578                  * issues an 'offline' command, that will be allowed
 579                  * to clear state.
 580                  */
 581                 sarewind(periph);
 582                 saloadunload(periph, FALSE);
 583                 closedbits |= SA_FLAG_TAPE_MOUNTED|SA_FLAG_TAPE_FROZEN;
 584                 break;
 585         case SA_MODE_REWIND:
 586                 /*
 587                  * If the rewind fails, return an error- if anyone cares,
 588                  * but not overwriting any previous error.
 589                  *
 590                  * We don't clear the notion of mounted here, but we do
 591                  * clear the notion of frozen if we successfully rewound.
 592                  */
 593                 tmp = sarewind(periph);
 594                 if (tmp) {
 595                         if (error != 0)
 596                                 error = tmp;
 597                 } else {
 598                         closedbits |= SA_FLAG_TAPE_FROZEN;
 599                 }
 600                 break;
 601         case SA_MODE_NOREWIND:
 602                 /*
 603                  * If we're not rewinding/unloading the tape, find out
 604                  * whether we need to back up over one of two filemarks
 605                  * we wrote (if we wrote two filemarks) so that appends
 606                  * from this point on will be sane.
 607                  */
 608                 if (error == 0 && writing && (softc->quirks & SA_QUIRK_2FM)) {
 609                         tmp = saspace(periph, -1, SS_FILEMARKS);
 610                         if (tmp) {
 611                                 xpt_print_path(periph->path);
 612                                 printf("unable to backspace over one of double"
 613                                    " filemarks at end of tape\n");
 614                                 xpt_print_path(periph->path);
 615                                 printf("it is possible that this device"
 616                                    " needs a SA_QUIRK_1FM quirk set for it\n");
 617                                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 618                         }
 619                 }
 620                 break;
 621         default:
 622                 xpt_print_path(periph->path);
 623                 panic("unknown mode 0x%x in saclose\n", mode);
 624                 /* NOTREACHED */
 625                 break;
 626         }
 627
 628         /*
 629          * We wish to note here that there are no more filemarks to be written.
 630          */
 631         softc->filemarks = 0;
 632         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
 633
 634         /*
 635          * And we are no longer open for business.
 636          */
 637         softc->flags &= ~closedbits;
 638
 639         /*
 640          * Inform users if tape state if frozen....
 641          */
 642         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 643                 xpt_print_path(periph->path);
 644                 printf("tape is now frozen- use an OFFLINE, REWIND or MTEOM "
 645                     "command to clear this state.\n");
 646         }
 647
 648         /* release the device if it is no longer mounted */
 649         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0)
 650                 sareservereleaseunit(periph, FALSE);
 651
 652         cam_periph_unlock(periph);
 653         cam_periph_release(periph);
 654
 655         return (error);
 656 }
 657
 658 /*
 659  * Actually translate the requested transfer into one the physical driver
 660  * can understand.  The transfer is described by a buf and will include
 661  * only one physical transfer.
 662  */
 663 static void
 664 sastrategy(dev_t dev, struct bio *bio)
 665 {
 666         struct buf *bp = bio->bio_buf;
 667         struct cam_periph *periph;
 668         struct sa_softc *softc;
 669         u_int  unit;
 670
 671         if (SA_IS_CTRL(dev)) {
 672                 bp->b_error = EINVAL;
 673                 goto bad;
 674         }
 675         unit = SAUNIT(dev);
 676         periph = cam_extend_get(saperiphs, unit);
 677         if (periph == NULL) {
 678                 bp->b_error = ENXIO;
 679                 goto bad;
 680         }
 681         softc = (struct sa_softc *)periph->softc;
 682
 683         crit_enter();
 684
 685         if (softc->flags & SA_FLAG_INVALID) {
 686                 crit_exit();
 687                 bp->b_error = ENXIO;
 688                 goto bad;
 689         }
 690
 691         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 692                 crit_exit();
 693                 bp->b_error = EPERM;
 694                 goto bad;
 695         }
 696
 697         crit_exit();
 698
 699         /*
 700          * If it's a null transfer, return immediatly
 701          */
 702         if (bp->b_bcount == 0)
 703                 goto done;
 704
 705         /* valid request?  */
 706         if (softc->flags & SA_FLAG_FIXED) {
 707                 /*
 708                  * Fixed block device.  The byte count must
 709                  * be a multiple of our block size.
 710                  */
 711                 if (((softc->blk_mask != ~0) &&
 712                     ((bp->b_bcount & softc->blk_mask) != 0)) ||
 713                     ((softc->blk_mask == ~0) &&
 714                     ((bp->b_bcount % softc->min_blk) != 0))) {
 715                         xpt_print_path(periph->path);
 716                         printf("Invalid request.  Fixed block device "
 717                                "requests must be a multiple "
 718                                "of %d bytes\n", softc->media_blksize);
 719                         bp->b_error = EINVAL;
 720                         goto bad;
 721                 }
 722         } else if ((bp->b_bcount > softc->max_blk) ||
 723                    (bp->b_bcount < softc->min_blk) ||
 724                    (bp->b_bcount & softc->blk_mask) != 0) {
 725
 726                 xpt_print_path(periph->path);
 727                 printf("Invalid request.  Variable block device "
 728                     "requests must be ");
 729                 if (softc->blk_mask != 0) {
 730                         printf("a multiple of %d ", (0x1 << softc->blk_gran));
 731                 }
 732                 printf("between %d and %d bytes\n", softc->min_blk,
 733                     softc->max_blk);
 734                 bp->b_error = EINVAL;
 735                 goto bad;
 736         }
 737
 738         /*
 739          * Mask interrupts so that the device cannot be invalidated until
 740          * after we are in the queue.  Otherwise, we might not properly
 741          * clean up one of the buffers.
 742          */
 743         crit_enter();
 744
 745         /*
 746          * Place it at the end of the queue.
 747          */
 748         bioq_insert_tail(&softc->bio_queue, bio);
 749
 750         softc->queue_count++;
 751         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastrategy: enqueuing a %d "
 752             "%s byte %s queue count now %d\n", (int) bp->b_bcount,
 753              (softc->flags & SA_FLAG_FIXED)?  "fixed" : "variable",
 754              (bp->b_cmd == BUF_CMD_READ)? "read" : "write", softc->queue_count));
 755
 756         crit_exit();
 757
 758         /*
 759          * Schedule ourselves for performing the work.
 760          */
 761         xpt_schedule(periph, 1);
 762
 763         return;
 764 bad:
 765         bp->b_flags |= B_ERROR;
 766 done:
 767
 768         /*
 769          * Correctly set the buf to indicate a completed xfer
 770          */
 771         bp->b_resid = bp->b_bcount;
 772         biodone(bio);
 773 }
 774
 775 static int
 776 saioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct thread *td)
 777 {
 778         struct cam_periph *periph;
 779         struct sa_softc *softc;
 780         scsi_space_code spaceop;
 781         int didlockperiph = 0;
 782         int unit;
 783         int mode;
 784         int density;
 785         int error = 0;
 786
 787         unit = SAUNIT(dev);
 788         mode = SAMODE(dev);
 789         density = SADENSITY(dev);
 790         error = 0;              /* shut up gcc */
 791         spaceop = 0;            /* shut up gcc */
 792
 793         periph = cam_extend_get(saperiphs, unit);
 794         if (periph == NULL)
 795                 return (ENXIO);
 796
 797         softc = (struct sa_softc *)periph->softc;
 798
 799         /*
 800          * Check for control mode accesses. We allow MTIOCGET and
 801          * MTIOCERRSTAT (but need to be the only one open in order
 802          * to clear latched status), and MTSETBSIZE, MTSETDNSTY
 803          * and MTCOMP (but need to be the only one accessing this
 804          * device to run those).
 805          */
 806
 807         if (SA_IS_CTRL(dev)) {
 808                 switch (cmd) {
 809                 case MTIOCGETEOTMODEL:
 810                 case MTIOCGET:
 811                         break;
 812                 case MTIOCERRSTAT:
 813                         /*
 814                          * If the periph isn't already locked, lock it
 815                          * so our MTIOCERRSTAT can reset latched error stats.
 816                          *
 817                          * If the periph is already locked, skip it because
 818                          * we're just getting status and it'll be up to the
 819                          * other thread that has this device open to do
 820                          * an MTIOCERRSTAT that would clear latched status.
 821                          */
 822                         crit_enter();
 823                         if ((periph->flags & CAM_PERIPH_LOCKED) == 0) {
 824                                 error = cam_periph_lock(periph, PCATCH);
 825                                 if (error != 0) {
 826                                         crit_exit();
 827                                         return (error);
 828                                 }
 829                                 didlockperiph = 1;
 830                         }
 831                         crit_exit();
 832                         break;
 833
 834                 case MTIOCSETEOTMODEL:
 835                 case MTSETBSIZ:
 836                 case MTSETDNSTY:
 837                 case MTCOMP:
 838                         /*
 839                          * We need to acquire the peripheral here rather
 840                          * than at open time because we are sharing writable
 841                          * access to data structures.
 842                          */
 843                         crit_enter();
 844                         error = cam_periph_lock(periph, PCATCH);
 845                         if (error != 0) {
 846                                 crit_exit();
 847                                 return (error);
 848                         }
 849                         didlockperiph = 1;
 850                         crit_exit();
 851                         break;
 852
 853                 default:
 854                         return (EINVAL);
 855                 }
 856         }
 857
 858         /*
 859          * Find the device that the user is talking about
 860          */
 861         switch (cmd) {
 862         case MTIOCGET:
 863         {
 864                 struct mtget *g = (struct mtget *)arg;
 865
 866                 /*
 867                  * If this isn't the control mode device, actually go out
 868                  * and ask the drive again what it's set to.
 869                  */
 870                 if (!SA_IS_CTRL(dev)) {
 871                         u_int8_t write_protect;
 872                         int comp_enabled, comp_supported;
 873                         error = sagetparams(periph, SA_PARAM_ALL,
 874                             &softc->media_blksize, &softc->media_density,
 875                             &softc->media_numblks, &softc->buffer_mode,
 876                             &write_protect, &softc->speed, &comp_supported,
 877                             &comp_enabled, &softc->comp_algorithm, NULL);
 878                         if (error)
 879                                 break;
 880                         if (write_protect)
 881                                 softc->flags |= SA_FLAG_TAPE_WP;
 882                         else
 883                                 softc->flags &= ~SA_FLAG_TAPE_WP;
 884                         softc->flags &= ~(SA_FLAG_COMP_SUPP|
 885                             SA_FLAG_COMP_ENABLED|SA_FLAG_COMP_UNSUPP);
 886                         if (comp_supported) {
 887                                 if (softc->saved_comp_algorithm == 0)
 888                                         softc->saved_comp_algorithm =
 889                                             softc->comp_algorithm;
 890                                 softc->flags |= SA_FLAG_COMP_SUPP;
 891                                 if (comp_enabled)
 892                                         softc->flags |= SA_FLAG_COMP_ENABLED;
 893                         } else
 894                                 softc->flags |= SA_FLAG_COMP_UNSUPP;
 895                 }
 896                 bzero(g, sizeof(struct mtget));
 897                 g->mt_type = MT_ISAR;
 898                 if (softc->flags & SA_FLAG_COMP_UNSUPP) {
 899                         g->mt_comp = MT_COMP_UNSUPP;
 900                         g->mt_comp0 = MT_COMP_UNSUPP;
 901                         g->mt_comp1 = MT_COMP_UNSUPP;
 902                         g->mt_comp2 = MT_COMP_UNSUPP;
 903                         g->mt_comp3 = MT_COMP_UNSUPP;
 904                 } else {
 905                         if ((softc->flags & SA_FLAG_COMP_ENABLED) == 0) {
 906                                 g->mt_comp = MT_COMP_DISABLED;
 907                         } else {
 908                                 g->mt_comp = softc->comp_algorithm;
 909                         }
 910                         g->mt_comp0 = softc->comp_algorithm;
 911                         g->mt_comp1 = softc->comp_algorithm;
 912                         g->mt_comp2 = softc->comp_algorithm;
 913                         g->mt_comp3 = softc->comp_algorithm;
 914                 }
 915                 g->mt_density = softc->media_density;
 916                 g->mt_density0 = softc->media_density;
 917                 g->mt_density1 = softc->media_density;
 918                 g->mt_density2 = softc->media_density;
 919                 g->mt_density3 = softc->media_density;
 920                 g->mt_blksiz = softc->media_blksize;
 921                 g->mt_blksiz0 = softc->media_blksize;
 922                 g->mt_blksiz1 = softc->media_blksize;
 923                 g->mt_blksiz2 = softc->media_blksize;
 924                 g->mt_blksiz3 = softc->media_blksize;
 925                 g->mt_fileno = softc->fileno;
 926                 g->mt_blkno = softc->blkno;
 927                 g->mt_dsreg = (short) softc->dsreg;
 928                 /*
 929                  * Yes, we know that this is likely to overflow
 930                  */
 931                 if (softc->last_resid_was_io) {
 932                         if ((g->mt_resid = (short) softc->last_io_resid) != 0) {
 933                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
 934                                         softc->last_io_resid = 0;
 935                                 }
 936                         }
 937                 } else {
 938                         if ((g->mt_resid = (short)softc->last_ctl_resid) != 0) {
 939                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
 940                                         softc->last_ctl_resid = 0;
 941                                 }
 942                         }
 943                 }
 944                 error = 0;
 945                 break;
 946         }
 947         case MTIOCERRSTAT:
 948         {
 949                 struct scsi_tape_errors *sep =
 950                     &((union mterrstat *)arg)->scsi_errstat;
 951
 952                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
 953                     ("saioctl: MTIOCERRSTAT\n"));
 954
 955                 bzero(sep, sizeof(*sep));
 956                 sep->io_resid = softc->last_io_resid;
 957                 bcopy((caddr_t) &softc->last_io_sense, sep->io_sense,
 958                     sizeof (sep->io_sense));
 959                 bcopy((caddr_t) &softc->last_io_cdb, sep->io_cdb,
 960                     sizeof (sep->io_cdb));
 961                 sep->ctl_resid = softc->last_ctl_resid;
 962                 bcopy((caddr_t) &softc->last_ctl_sense, sep->ctl_sense,
 963                     sizeof (sep->ctl_sense));
 964                 bcopy((caddr_t) &softc->last_ctl_cdb, sep->ctl_cdb,
 965                     sizeof (sep->ctl_cdb));
 966
 967                 if (SA_IS_CTRL(dev) == 0 || didlockperiph)
 968                         bzero((caddr_t) &softc->errinfo,
 969                             sizeof (softc->errinfo));
 970                 error = 0;
 971                 break;
 972         }
 973         case MTIOCTOP:
 974         {
 975                 struct mtop *mt;
 976                 int    count;
 977
 978                 mt = (struct mtop *)arg;
 979
 980                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
 981                          ("saioctl: op=0x%x count=0x%x\n",
 982                           mt->mt_op, mt->mt_count));
 983
 984                 count = mt->mt_count;
 985                 switch (mt->mt_op) {
 986                 case MTWEOF:    /* write an end-of-file marker */
 987                         /*
 988                          * We don't need to clear the SA_FLAG_TAPE_WRITTEN
 989                          * flag because by keeping track of filemarks
 990                          * we have last written we know ehether or not
 991                          * we need to write more when we close the device.
 992                          */
 993                         error = sawritefilemarks(periph, count, FALSE);
 994                         break;
 995                 case MTWSS:     /* write a setmark */
 996                         error = sawritefilemarks(periph, count, TRUE);
 997                         break;
 998                 case MTBSR:     /* backward space record */
 999                 case MTFSR:     /* forward space record */
1000                 case MTBSF:     /* backward space file */
1001                 case MTFSF:     /* forward space file */
1002                 case MTBSS:     /* backward space setmark */
1003                 case MTFSS:     /* forward space setmark */
1004                 case MTEOD:     /* space to end of recorded medium */
1005                 {
1006                         int nmarks;
1007
1008                         spaceop = SS_FILEMARKS;
1009                         nmarks = softc->filemarks;
1010                         error = sacheckeod(periph);
1011                         if (error) {
1012                                 xpt_print_path(periph->path);
1013                                 printf("EOD check prior to spacing failed\n");
1014                                 softc->flags |= SA_FLAG_EIO_PENDING;
1015                                 break;
1016                         }
1017                         nmarks -= softc->filemarks;
1018                         switch(mt->mt_op) {
1019                         case MTBSR:
1020                                 count = -count;
1021                                 /* FALLTHROUGH */
1022                         case MTFSR:
1023                                 spaceop = SS_BLOCKS;
1024                                 break;
1025                         case MTBSF:
1026                                 count = -count;
1027                                 /* FALLTHROUGH */
1028                         case MTFSF:
1029                                 break;
1030                         case MTBSS:
1031                                 count = -count;
1032                                 /* FALLTHROUGH */
1033                         case MTFSS:
1034                                 spaceop = SS_SETMARKS;
1035                                 break;
1036                         case MTEOD:
1037                                 spaceop = SS_EOD;
1038                                 count = 0;
1039                                 nmarks = 0;
1040                                 break;
1041                         default:
1042                                 error = EINVAL;
1043                                 break;
1044                         }
1045                         if (error)
1046                                 break;
1047
1048                         nmarks = softc->filemarks;
1049                         /*
1050                          * XXX: Why are we checking again?
1051                          */
1052                         error = sacheckeod(periph);
1053                         if (error)
1054                                 break;
1055                         nmarks -= softc->filemarks;
1056                         error = saspace(periph, count - nmarks, spaceop);
1057                         /*
1058                          * At this point, clear that we've written the tape
1059                          * and that we've written any filemarks. We really
1060                          * don't know what the applications wishes to do next-
1061                          * the sacheckeod's will make sure we terminated the
1062                          * tape correctly if we'd been writing, but the next
1063                          * action the user application takes will set again
1064                          * whether we need to write filemarks.
1065                          */
1066                         softc->flags &=
1067                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1068                         softc->filemarks = 0;
1069                         break;
1070                 }
1071                 case MTREW:     /* rewind */
1072                         sacheckeod(periph);
1073                         error = sarewind(periph);
1074                         /* see above */
1075                         softc->flags &=
1076                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1077                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1078                         softc->filemarks = 0;
1079                         break;
1080                 case MTERASE:   /* erase */
1081                         error = saerase(periph, count);
1082                         softc->flags &=
1083                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1084                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1085                         break;
1086                 case MTRETENS:  /* re-tension tape */
1087                         error = saretension(periph);
1088                         softc->flags &=
1089                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1090                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1091                         break;
1092                 case MTOFFL:    /* rewind and put the drive offline */
1093
1094                         sacheckeod(periph);
1095                         /* see above */
1096                         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
1097                         softc->filemarks = 0;
1098
1099                         error = sarewind(periph);
1100                         /* clear the frozen flag anyway */
1101                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1102
1103                         /*
1104                          * Be sure to allow media removal before ejecting.
1105                          */
1106
1107                         saprevent(periph, PR_ALLOW);
1108                         if (error == 0) {
1109                                 error = saloadunload(periph, FALSE);
1110                                 if (error == 0) {
1111                                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1112                                 }
1113                         }
1114                         break;
1115
1116                 case MTNOP:     /* no operation, sets status only */
1117                 case MTCACHE:   /* enable controller cache */
1118                 case MTNOCACHE: /* disable controller cache */
1119                         error = 0;
1120                         break;
1121
1122                 case MTSETBSIZ: /* Set block size for device */
1123
1124                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE, count,
1125                                             0, 0, 0);
1126                         if (error == 0) {
1127                                 softc->last_media_blksize =
1128                                     softc->media_blksize;
1129                                 softc->media_blksize = count;
1130                                 if (count) {
1131                                         softc->flags |= SA_FLAG_FIXED;
1132                                         if (powerof2(count)) {
1133                                                 softc->blk_shift =
1134                                                     ffs(count) - 1;
1135                                                 softc->blk_mask = count - 1;
1136                                         } else {
1137                                                 softc->blk_mask = ~0;
1138                                                 softc->blk_shift = 0;
1139                                         }
1140                                         /*
1141                                          * Make the user's desire 'persistent'.
1142                                          */
1143                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
1144                                         softc->quirks |= SA_QUIRK_FIXED;
1145                                 } else {
1146                                         softc->flags &= ~SA_FLAG_FIXED;
1147                                         if (softc->max_blk == 0) {
1148                                                 softc->max_blk = ~0;
1149                                         }
1150                                         softc->blk_shift = 0;
1151                                         if (softc->blk_gran != 0) {
1152                                                 softc->blk_mask =
1153                                                     softc->blk_gran - 1;
1154                                         } else {
1155                                                 softc->blk_mask = 0;
1156                                         }
1157                                         /*
1158                                          * Make the user's desire 'persistent'.
1159                                          */
1160                                         softc->quirks |= SA_QUIRK_VARIABLE;
1161                                         softc->quirks &= ~SA_QUIRK_FIXED;
1162                                 }
1163                         }
1164                         break;
1165                 case MTSETDNSTY:        /* Set density for device and mode */
1166                         if (count > UCHAR_MAX) {
1167                                 error = EINVAL;
1168                                 break;
1169                         } else {
1170                                 error = sasetparams(periph, SA_PARAM_DENSITY,
1171                                                     0, count, 0, 0);
1172                         }
1173                         break;
1174                 case MTCOMP:    /* enable compression */
1175                         /*
1176                          * Some devices don't support compression, and
1177                          * don't like it if you ask them for the
1178                          * compression page.
1179                          */
1180                         if ((softc->quirks & SA_QUIRK_NOCOMP) ||
1181                             (softc->flags & SA_FLAG_COMP_UNSUPP)) {
1182                                 error = ENODEV;
1183                                 break;
1184                         }
1185                         error = sasetparams(periph, SA_PARAM_COMPRESSION,
1186                             0, 0, count, SF_NO_PRINT);
1187                         break;
1188                 default:
1189                         error = EINVAL;
1190                 }
1191                 break;
1192         }
1193         case MTIOCIEOT:
1194         case MTIOCEEOT:
1195                 error = 0;
1196                 break;
1197         case MTIOCRDSPOS:
1198                 error = sardpos(periph, 0, (u_int32_t *) arg);
1199                 break;
1200         case MTIOCRDHPOS:
1201                 error = sardpos(periph, 1, (u_int32_t *) arg);
1202                 break;
1203         case MTIOCSLOCATE:
1204                 error = sasetpos(periph, 0, (u_int32_t *) arg);
1205                 break;
1206         case MTIOCHLOCATE:
1207                 error = sasetpos(periph, 1, (u_int32_t *) arg);
1208                 break;
1209         case MTIOCGETEOTMODEL:
1210                 error = 0;
1211                 if (softc->quirks & SA_QUIRK_1FM)
1212                         mode = 1;
1213                 else
1214                         mode = 2;
1215                 *((u_int32_t *) arg) = mode;
1216                 break;
1217         case MTIOCSETEOTMODEL:
1218                 error = 0;
1219                 switch (*((u_int32_t *) arg)) {
1220                 case 1:
1221                         softc->quirks &= ~SA_QUIRK_2FM;
1222                         softc->quirks |= SA_QUIRK_1FM;
1223                         break;
1224                 case 2:
1225                         softc->quirks &= ~SA_QUIRK_1FM;
1226                         softc->quirks |= SA_QUIRK_2FM;
1227                         break;
1228                 default:
1229                         error = EINVAL;
1230                         break;
1231                 }
1232                 break;
1233         default:
1234                 error = cam_periph_ioctl(periph, cmd, arg, saerror);
1235                 break;
1236         }
1237
1238         /*
1239          * Check to see if we cleared a frozen state
1240          */
1241         if (error == 0 && (softc->flags & SA_FLAG_TAPE_FROZEN)) {
1242                 switch(cmd) {
1243                 case MTIOCRDSPOS:
1244                 case MTIOCRDHPOS:
1245                 case MTIOCSLOCATE:
1246                 case MTIOCHLOCATE:
1247                         softc->fileno = (daddr_t) -1;
1248                         softc->blkno = (daddr_t) -1;
1249                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1250                         xpt_print_path(periph->path);
1251                         printf("tape state now unfrozen.\n");
1252                         break;
1253                 default:
1254                         break;
1255                 }
1256         }
1257         if (didlockperiph) {
1258                 cam_periph_unlock(periph);
1259         }
1260         return (error);
1261 }
1262
1263 static void
1264 sainit(void)
1265 {
1266         cam_status status;
1267         struct cam_path *path;
1268
1269         /*
1270          * Create our extend array for storing the devices we attach to.
1271          */
1272         saperiphs = cam_extend_new();
1273         if (saperiphs == NULL) {
1274                 printf("sa: Failed to alloc extend array!\n");
1275                 return;
1276         }
1277
1278         /*
1279          * Install a global async callback.
1280          */
1281         status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1282                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
1283
1284         if (status == CAM_REQ_CMP) {
1285                 /* Register the async callbacks of interrest */
1286                 struct ccb_setasync csa; /*
1287                                           * This is an immediate CCB,
1288                                           * so using the stack is OK
1289                                           */
1290                 xpt_setup_ccb(&csa.ccb_h, path, 5);
1291                 csa.ccb_h.func_code = XPT_SASYNC_CB;
1292                 csa.event_enable = AC_FOUND_DEVICE;
1293                 csa.callback = saasync;
1294                 csa.callback_arg = NULL;
1295                 xpt_action((union ccb *)&csa);
1296                 status = csa.ccb_h.status;
1297                 xpt_free_path(path);
1298         }
1299
1300         if (status != CAM_REQ_CMP) {
1301                 printf("sa: Failed to attach master async callback "
1302                        "due to status 0x%x!\n", status);
1303         }
1304 }
1305
1306 static void
1307 saoninvalidate(struct cam_periph *periph)
1308 {
1309         struct sa_softc *softc;
1310         struct buf *q_bp;
1311         struct bio *q_bio;
1312         struct ccb_setasync csa;
1313
1314         softc = (struct sa_softc *)periph->softc;
1315
1316         /*
1317          * De-register any async callbacks.
1318          */
1319         xpt_setup_ccb(&csa.ccb_h, periph->path,
1320                       /* priority */ 5);
1321         csa.ccb_h.func_code = XPT_SASYNC_CB;
1322         csa.event_enable = 0;
1323         csa.callback = saasync;
1324         csa.callback_arg = periph;
1325         xpt_action((union ccb *)&csa);
1326
1327         softc->flags |= SA_FLAG_INVALID;
1328
1329         /*
1330          * We need to be in a critical section here to keep the buffer
1331          * queue from being modified while we traverse it.
1332          */
1333         crit_enter();
1334
1335         /*
1336          * Return all queued I/O with ENXIO.
1337          * XXX Handle any transactions queued to the card
1338          *     with XPT_ABORT_CCB.
1339          */
1340         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL){
1341                 bioq_remove(&softc->bio_queue, q_bio);
1342                 q_bp = q_bio->bio_buf;
1343                 q_bp->b_resid = q_bp->b_bcount;
1344                 q_bp->b_error = ENXIO;
1345                 q_bp->b_flags |= B_ERROR;
1346                 biodone(q_bio);
1347         }
1348         softc->queue_count = 0;
1349         crit_exit();
1350
1351         xpt_print_path(periph->path);
1352         printf("lost device\n");
1353
1354 }
1355
1356 static void
1357 sacleanup(struct cam_periph *periph)
1358 {
1359         struct sa_softc *softc;
1360
1361         softc = (struct sa_softc *)periph->softc;
1362
1363         devstat_remove_entry(&softc->device_stats);
1364
1365         cam_extend_release(saperiphs, periph->unit_number);
1366         xpt_print_path(periph->path);
1367         printf("removing device entry\n");
1368         cdevsw_remove(&sa_cdevsw, SA_UNITMASK, SA_UNIT(periph->unit_number));
1369         free(softc, M_DEVBUF);
1370 }
1371
1372 static void
1373 saasync(void *callback_arg, u_int32_t code,
1374         struct cam_path *path, void *arg)
1375 {
1376         struct cam_periph *periph;
1377
1378         periph = (struct cam_periph *)callback_arg;
1379         switch (code) {
1380         case AC_FOUND_DEVICE:
1381         {
1382                 struct ccb_getdev *cgd;
1383                 cam_status status;
1384
1385                 cgd = (struct ccb_getdev *)arg;
1386                 if (cgd == NULL)
1387                         break;
1388
1389                 if (SID_TYPE(&cgd->inq_data) != T_SEQUENTIAL)
1390                         break;
1391
1392                 /*
1393                  * Allocate a peripheral instance for
1394                  * this device and start the probe
1395                  * process.
1396                  */
1397                 status = cam_periph_alloc(saregister, saoninvalidate,
1398                                           sacleanup, sastart,
1399                                           "sa", CAM_PERIPH_BIO, cgd->ccb_h.path,
1400                                           saasync, AC_FOUND_DEVICE, cgd);
1401
1402                 if (status != CAM_REQ_CMP
1403                  && status != CAM_REQ_INPROG)
1404                         printf("saasync: Unable to probe new device "
1405                                 "due to status 0x%x\n", status);
1406                 break;
1407         }
1408         default:
1409                 cam_periph_async(periph, code, path, arg);
1410                 break;
1411         }
1412 }
1413
1414 static cam_status
1415 saregister(struct cam_periph *periph, void *arg)
1416 {
1417         struct sa_softc *softc;
1418         struct ccb_setasync csa;
1419         struct ccb_getdev *cgd;
1420         caddr_t match;
1421         int i;
1422
1423         cgd = (struct ccb_getdev *)arg;
1424         if (periph == NULL) {
1425                 printf("saregister: periph was NULL!!\n");
1426                 return (CAM_REQ_CMP_ERR);
1427         }
1428
1429         if (cgd == NULL) {
1430                 printf("saregister: no getdev CCB, can't register device\n");
1431                 return (CAM_REQ_CMP_ERR);
1432         }
1433
1434         softc = malloc(sizeof (*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
1435         softc->scsi_rev = SID_ANSI_REV(&cgd->inq_data);
1436         softc->state = SA_STATE_NORMAL;
1437         softc->fileno = (daddr_t) -1;
1438         softc->blkno = (daddr_t) -1;
1439
1440         bioq_init(&softc->bio_queue);
1441         periph->softc = softc;
1442         cam_extend_set(saperiphs, periph->unit_number, periph);
1443
1444         /*
1445          * See if this device has any quirks.
1446          */
1447         match = cam_quirkmatch((caddr_t)&cgd->inq_data,
1448                                (caddr_t)sa_quirk_table,
1449                                sizeof(sa_quirk_table)/sizeof(*sa_quirk_table),
1450                                sizeof(*sa_quirk_table), scsi_inquiry_match);
1451
1452         if (match != NULL) {
1453                 softc->quirks = ((struct sa_quirk_entry *)match)->quirks;
1454                 softc->last_media_blksize =
1455                     ((struct sa_quirk_entry *)match)->prefblk;
1456 #ifdef  CAMDEBUG
1457                 xpt_print_path(periph->path);
1458                 printf("found quirk entry %d\n", (int)
1459                     (((struct sa_quirk_entry *) match) - sa_quirk_table));
1460 #endif
1461         } else
1462                 softc->quirks = SA_QUIRK_NONE;
1463
1464         /*
1465          * The SA driver supports a blocksize, but we don't know the
1466          * blocksize until we media is inserted.  So, set a flag to
1467          * indicate that the blocksize is unavailable right now.
1468          */
1469         devstat_add_entry(&softc->device_stats, "sa", periph->unit_number, 0,
1470             DEVSTAT_BS_UNAVAILABLE, SID_TYPE(&cgd->inq_data) |
1471             DEVSTAT_TYPE_IF_SCSI, DEVSTAT_PRIORITY_TAPE);
1472
1473         cdevsw_add(&sa_cdevsw, SA_UNITMASK, SA_UNIT(periph->unit_number));
1474         make_dev(&sa_cdevsw, SAMINOR(SA_CTLDEV,
1475             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1476             0660, "r%s%d.ctl", periph->periph_name, periph->unit_number);
1477
1478         make_dev(&sa_cdevsw, SAMINOR(SA_NOT_CTLDEV,
1479             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1480             0660, "r%s%d", periph->periph_name, periph->unit_number);
1481
1482         make_dev(&sa_cdevsw, SAMINOR(SA_NOT_CTLDEV,
1483             periph->unit_number, 0, SA_ATYPE_NR), UID_ROOT, GID_OPERATOR,
1484             0660, "nr%s%d", periph->periph_name, periph->unit_number);
1485
1486         make_dev(&sa_cdevsw, SAMINOR(SA_NOT_CTLDEV,
1487             periph->unit_number, 0, SA_ATYPE_ER), UID_ROOT, GID_OPERATOR,
1488             0660, "er%s%d", periph->periph_name, periph->unit_number);
1489
1490         for (i = 0; i < SA_NUM_MODES; i++) {
1491
1492                 make_dev(&sa_cdevsw,
1493                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_R),
1494                     UID_ROOT, GID_OPERATOR, 0660, "r%s%d.%d",
1495                     periph->periph_name, periph->unit_number, i);
1496
1497                 make_dev(&sa_cdevsw,
1498                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_NR),
1499                     UID_ROOT, GID_OPERATOR, 0660, "nr%s%d.%d",
1500                     periph->periph_name, periph->unit_number, i);
1501
1502
1503                 make_dev(&sa_cdevsw,
1504                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_ER),
1505                     UID_ROOT, GID_OPERATOR, 0660, "er%s%d.%d",
1506                     periph->periph_name, periph->unit_number, i);
1507         }
1508
1509         /*
1510          * Add an async callback so that we get
1511          * notified if this device goes away.
1512          */
1513         xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5);
1514         csa.ccb_h.func_code = XPT_SASYNC_CB;
1515         csa.event_enable = AC_LOST_DEVICE;
1516         csa.callback = saasync;
1517         csa.callback_arg = periph;
1518         xpt_action((union ccb *)&csa);
1519
1520         xpt_announce_periph(periph, NULL);
1521
1522         return (CAM_REQ_CMP);
1523 }
1524
1525 static void
1526 sastart(struct cam_periph *periph, union ccb *start_ccb)
1527 {
1528         struct sa_softc *softc;
1529
1530         softc = (struct sa_softc *)periph->softc;
1531
1532         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastart"));
1533
1534
1535         switch (softc->state) {
1536         case SA_STATE_NORMAL:
1537         {
1538                 /* Pull a buffer from the queue and get going on it */
1539                 struct buf *bp;
1540                 struct bio *bio;
1541
1542                 /*
1543                  * See if there is a buf with work for us to do..
1544                  */
1545                 crit_enter();
1546                 bio = bioq_first(&softc->bio_queue);
1547                 if (periph->immediate_priority <= periph->pinfo.priority) {
1548                         CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
1549                                         ("queuing for immediate ccb\n"));
1550                         Set_CCB_Type(start_ccb, SA_CCB_WAITING);
1551                         SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
1552                                           periph_links.sle);
1553                         periph->immediate_priority = CAM_PRIORITY_NONE;
1554                         crit_exit();
1555                         wakeup(&periph->ccb_list);
1556                 } else if (bio == NULL) {
1557                         crit_exit();
1558                         xpt_release_ccb(start_ccb);
1559                 } else if ((softc->flags & SA_FLAG_ERR_PENDING) != 0) {
1560                         struct bio *done_bio;
1561 again:
1562                         softc->queue_count--;
1563                         bioq_remove(&softc->bio_queue, bio);
1564                         bp = bio->bio_buf;
1565                         bp->b_resid = bp->b_bcount;
1566                         done_bio = bio;
1567                         if ((softc->flags & SA_FLAG_EOM_PENDING) != 0) {
1568                                 /*
1569                                  * We now just clear errors in this case
1570                                  * and let the residual be the notifier.
1571                                  */
1572                                 bp->b_error = 0;
1573                         } else if ((softc->flags & SA_FLAG_EOF_PENDING) != 0) {
1574                                 /*
1575                                  * This can only happen if we're reading
1576                                  * in fixed length mode. In this case,
1577                                  * we dump the rest of the list the
1578                                  * same way.
1579                                  */
1580                                 bp->b_error = 0;
1581                                 if (bioq_first(&softc->bio_queue) != NULL) {
1582                                         biodone(done_bio);
1583                                         goto again;
1584                                 }
1585                         } else if ((softc->flags & SA_FLAG_EIO_PENDING) != 0) {
1586                                 bp->b_error = EIO;
1587                                 bp->b_flags |= B_ERROR;
1588                         }
1589                         bio = bioq_first(&softc->bio_queue);
1590                         /*
1591                          * Only if we have no other buffers queued up
1592                          * do we clear the pending error flag.
1593                          */
1594                         if (bio == NULL)
1595                                 softc->flags &= ~SA_FLAG_ERR_PENDING;
1596                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1597                             ("sastart- ERR_PENDING now 0x%x, bio is %sNULL, "
1598                             "%d more buffers queued up\n",
1599                             (softc->flags & SA_FLAG_ERR_PENDING),
1600                             (bio != NULL)? "not " : " ", softc->queue_count));
1601                         crit_exit();
1602                         xpt_release_ccb(start_ccb);
1603                         biodone(done_bio);
1604                 } else {
1605                         u_int32_t length;
1606
1607                         bioq_remove(&softc->bio_queue, bio);
1608                         bp = bio->bio_buf;
1609                         softc->queue_count--;
1610
1611                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
1612                                 if (softc->blk_shift != 0) {
1613                                         length =
1614                                             bp->b_bcount >> softc->blk_shift;
1615                                 } else if (softc->media_blksize != 0) {
1616                                         length =
1617                                             bp->b_bcount / softc->media_blksize;
1618                                 } else {
1619                                         bp->b_error = EIO;
1620                                         xpt_print_path(periph->path);
1621                                         printf("zero blocksize for "
1622                                             "FIXED length writes?\n");
1623                                         crit_exit();
1624                                         biodone(bio);
1625                                         break;
1626                                 }
1627                                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1628                                     ("Fixed Record Count is %d\n", length));
1629                         } else {
1630                                 length = bp->b_bcount;
1631                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1632                                     ("Variable Record Count is %d\n", length));
1633                         }
1634                         devstat_start_transaction(&softc->device_stats);
1635                         /*
1636                          * Some people have theorized that we should
1637                          * suppress illegal length indication if we are
1638                          * running in variable block mode so that we don't
1639                          * have to request sense every time our requested
1640                          * block size is larger than the written block.
1641                          * The residual information from the ccb allows
1642                          * us to identify this situation anyway.  The only
1643                          * problem with this is that we will not get
1644                          * information about blocks that are larger than
1645                          * our read buffer unless we set the block size
1646                          * in the mode page to something other than 0.
1647                          *
1648                          * I believe that this is a non-issue. If user apps
1649                          * don't adjust their read size to match our record
1650                          * size, that's just life. Anyway, the typical usage
1651                          * would be to issue, e.g., 64KB reads and occasionally
1652                          * have to do deal with 512 byte or 1KB intermediate
1653                          * records.
1654                          */
1655                         softc->dsreg = (bp->b_cmd == BUF_CMD_READ) ?
1656                             MTIO_DSREG_RD : MTIO_DSREG_WR;
1657                         scsi_sa_read_write(&start_ccb->csio, 0, sadone,
1658                             MSG_SIMPLE_Q_TAG, (bp->b_cmd == BUF_CMD_READ) != 0,
1659                             FALSE, (softc->flags & SA_FLAG_FIXED) != 0,
1660                             length, bp->b_data, bp->b_bcount, SSD_FULL_SIZE,
1661                             IO_TIMEOUT);
1662                         start_ccb->ccb_h.ccb_pflags &= ~SA_POSITION_UPDATED;
1663                         Set_CCB_Type(start_ccb, SA_CCB_BUFFER_IO);
1664                         start_ccb->ccb_h.ccb_bio = bio;
1665                         bio = bioq_first(&softc->bio_queue);
1666                         crit_exit();
1667                         xpt_action(start_ccb);
1668                 }
1669
1670                 if (bio != NULL) {
1671                         /* Have more work to do, so ensure we stay scheduled */
1672                         xpt_schedule(periph, 1);
1673                 }
1674                 break;
1675         }
1676         case SA_STATE_ABNORMAL:
1677         default:
1678                 panic("state 0x%x in sastart", softc->state);
1679                 break;
1680         }
1681 }
1682
1683
1684 static void
1685 sadone(struct cam_periph *periph, union ccb *done_ccb)
1686 {
1687         struct sa_softc *softc;
1688         struct ccb_scsiio *csio;
1689
1690         softc = (struct sa_softc *)periph->softc;
1691         csio = &done_ccb->csio;
1692         switch (CCB_Type(csio)) {
1693         case SA_CCB_BUFFER_IO:
1694         {
1695                 struct buf *bp;
1696                 struct bio *bio;
1697                 int error;
1698
1699                 softc->dsreg = MTIO_DSREG_REST;
1700                 bio = (struct bio *)done_ccb->ccb_h.ccb_bio;
1701                 bp = bio->bio_buf;
1702                 error = 0;
1703                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1704                         if ((error = saerror(done_ccb, 0, 0)) == ERESTART) {
1705                                 /*
1706                                  * A retry was scheduled, so just return.
1707                                  */
1708                                 return;
1709                         }
1710                 }
1711
1712                 if (error == EIO) {
1713                         struct buf *q_bp;
1714                         struct bio *q_bio;
1715
1716                         /*
1717                          * Catastrophic error. Mark the tape as frozen
1718                          * (we no longer know tape position).
1719                          *
1720                          * Return all queued I/O with EIO, and unfreeze
1721                          * our queue so that future transactions that
1722                          * attempt to fix this problem can get to the
1723                          * device.
1724                          *
1725                          */
1726
1727                         crit_enter();
1728                         softc->flags |= SA_FLAG_TAPE_FROZEN;
1729                         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL) {
1730                                 bioq_remove(&softc->bio_queue, q_bio);
1731                                 q_bp = q_bio->bio_buf;
1732                                 q_bp->b_resid = q_bp->b_bcount;
1733                                 q_bp->b_error = EIO;
1734                                 q_bp->b_flags |= B_ERROR;
1735                                 biodone(q_bio);
1736                         }
1737                         crit_exit();
1738                 }
1739                 if (error != 0) {
1740                         bp->b_resid = bp->b_bcount;
1741                         bp->b_error = error;
1742                         bp->b_flags |= B_ERROR;
1743                         /*
1744                          * In the error case, position is updated in saerror.
1745                          */
1746                 } else {
1747                         bp->b_resid = csio->resid;
1748                         bp->b_error = 0;
1749                         if (csio->resid != 0) {
1750                                 bp->b_flags |= B_ERROR;
1751                         }
1752                         if (bp->b_cmd != BUF_CMD_READ) {
1753                                 softc->flags |= SA_FLAG_TAPE_WRITTEN;
1754                                 softc->filemarks = 0;
1755                         }
1756                         if (!(csio->ccb_h.ccb_pflags & SA_POSITION_UPDATED) &&
1757                             (softc->blkno != (daddr_t) -1)) {
1758                                 if ((softc->flags & SA_FLAG_FIXED) != 0) {
1759                                         u_int32_t l;
1760                                         if (softc->blk_shift != 0) {
1761                                                 l = bp->b_bcount >>
1762                                                         softc->blk_shift;
1763                                         } else {
1764                                                 l = bp->b_bcount /
1765                                                         softc->media_blksize;
1766                                         }
1767                                         softc->blkno += (daddr_t) l;
1768                                 } else {
1769                                         softc->blkno++;
1770                                 }
1771                         }
1772                 }
1773                 /*
1774                  * If we had an error (immediate or pending),
1775                  * release the device queue now.
1776                  */
1777                 if (error || (softc->flags & SA_FLAG_ERR_PENDING))
1778                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1779 #ifdef  CAMDEBUG
1780                 if (error || bp->b_resid) {
1781                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1782                                   ("error %d resid %d count %d\n", error,
1783                                   bp->b_resid, bp->b_bcount));
1784                 }
1785 #endif
1786                 devstat_end_transaction_buf(&softc->device_stats, bp);
1787                 biodone(bio);
1788                 break;
1789         }
1790         case SA_CCB_WAITING:
1791         {
1792                 /* Caller will release the CCB */
1793                 wakeup(&done_ccb->ccb_h.cbfcnp);
1794                 return;
1795         }
1796         }
1797         xpt_release_ccb(done_ccb);
1798 }
1799
1800 /*
1801  * Mount the tape (make sure it's ready for I/O).
1802  */
1803 static int
1804 samount(struct cam_periph *periph, int oflags, dev_t dev)
1805 {
1806         struct  sa_softc *softc;
1807         union   ccb *ccb;
1808         int     error;
1809
1810         /*
1811          * oflags can be checked for 'kind' of open (read-only check) - later
1812          * dev can be checked for a control-mode or compression open - later
1813          */
1814         UNUSED_PARAMETER(oflags);
1815         UNUSED_PARAMETER(dev);
1816
1817
1818         softc = (struct sa_softc *)periph->softc;
1819
1820         /*
1821          * This should determine if something has happend since the last
1822          * open/mount that would invalidate the mount. We do *not* want
1823          * to retry this command- we just want the status. But we only
1824          * do this if we're mounted already- if we're not mounted,
1825          * we don't care about the unit read state and can instead use
1826          * this opportunity to attempt to reserve the tape unit.
1827          */
1828
1829         if (softc->flags & SA_FLAG_TAPE_MOUNTED) {
1830                 ccb = cam_periph_getccb(periph, 1);
1831                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1832                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1833                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1834                     &softc->device_stats);
1835                 QFRLS(ccb);
1836                 if (error == ENXIO) {
1837                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1838                         scsi_test_unit_ready(&ccb->csio, 0, sadone,
1839                             MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1840                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1841                             &softc->device_stats);
1842                         QFRLS(ccb);
1843                 } else if (error) {
1844                         /*
1845                          * We don't need to freeze the tape because we
1846                          * will now attempt to rewind/load it.
1847                          */
1848                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1849                         if (CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO)) {
1850                                 xpt_print_path(ccb->ccb_h.path);
1851                                 printf("error %d on TUR in samount\n", error);
1852                         }
1853                 }
1854         } else {
1855                 error = sareservereleaseunit(periph, TRUE);
1856                 if (error) {
1857                         return (error);
1858                 }
1859                 ccb = cam_periph_getccb(periph, 1);
1860                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1861                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1862                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1863                     &softc->device_stats);
1864                 QFRLS(ccb);
1865         }
1866
1867         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
1868                 struct scsi_read_block_limits_data *rblim = NULL;
1869                 int comp_enabled, comp_supported;
1870                 u_int8_t write_protect, guessing = 0;
1871
1872                 /*
1873                  * Clear out old state.
1874                  */
1875                 softc->flags &= ~(SA_FLAG_TAPE_WP|SA_FLAG_TAPE_WRITTEN|
1876                                   SA_FLAG_ERR_PENDING|SA_FLAG_COMP_ENABLED|
1877                                   SA_FLAG_COMP_SUPP|SA_FLAG_COMP_UNSUPP);
1878                 softc->filemarks = 0;
1879
1880                 /*
1881                  * *Very* first off, make sure we're loaded to BOT.
1882                  */
1883                 scsi_load_unload(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
1884                     FALSE, FALSE, 1, SSD_FULL_SIZE, REWIND_TIMEOUT);
1885                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1886                     &softc->device_stats);
1887                 QFRLS(ccb);
1888
1889                 /*
1890                  * In case this doesn't work, do a REWIND instead
1891                  */
1892                 if (error) {
1893                         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
1894                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1895                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1896                                 &softc->device_stats);
1897                         QFRLS(ccb);
1898                 }
1899                 if (error) {
1900                         xpt_release_ccb(ccb);
1901                         goto exit;
1902                 }
1903
1904                 /*
1905                  * Do a dummy test read to force access to the
1906                  * media so that the drive will really know what's
1907                  * there. We actually don't really care what the
1908                  * blocksize on tape is and don't expect to really
1909                  * read a full record.
1910                  */
1911                 rblim = malloc(8192, M_TEMP, M_INTWAIT);
1912
1913                 if ((softc->quirks & SA_QUIRK_NODREAD) == 0) {
1914                         scsi_sa_read_write(&ccb->csio, 0, sadone,
1915                             MSG_SIMPLE_Q_TAG, 1, FALSE, 0, 8192,
1916                             (void *) rblim, 8192, SSD_FULL_SIZE,
1917                             IO_TIMEOUT);
1918                         cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1919                             &softc->device_stats);
1920                         QFRLS(ccb);
1921                         scsi_rewind(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
1922                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1923                         error = cam_periph_runccb(ccb, saerror, 0,
1924                             SF_NO_PRINT | SF_RETRY_SELTO | SF_RETRY_UA,
1925                             &softc->device_stats);
1926                         QFRLS(ccb);
1927                         if (error) {
1928                                 xpt_print_path(ccb->ccb_h.path);
1929                                 printf("unable to rewind after test read\n");
1930                                 xpt_release_ccb(ccb);
1931                                 goto exit;
1932                         }
1933                 }
1934
1935                 /*
1936                  * Next off, determine block limits.
1937                  */
1938                 scsi_read_block_limits(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
1939                     rblim, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
1940
1941                 error = cam_periph_runccb(ccb, saerror, 0,
1942                     SF_NO_PRINT | SF_RETRY_UA | SF_RETRY_SELTO,
1943                     &softc->device_stats);
1944                 QFRLS(ccb);
1945                 xpt_release_ccb(ccb);
1946
1947                 if (error != 0) {
1948                         /*
1949                          * If it's less than SCSI-2, READ BLOCK LIMITS is not
1950                          * a MANDATORY command. Anyway- it doesn't matter-
1951                          * we can proceed anyway.
1952                          */
1953                         softc->blk_gran = 0;
1954                         softc->max_blk = ~0;
1955                         softc->min_blk = 0;
1956                 } else {
1957                         if (softc->scsi_rev >= SCSI_REV_3) {
1958                                 softc->blk_gran = RBL_GRAN(rblim);
1959                         } else {
1960                                 softc->blk_gran = 0;
1961                         }
1962                         /*
1963                          * We take max_blk == min_blk to mean a default to
1964                          * fixed mode- but note that whatever we get out of
1965                          * sagetparams below will actually determine whether
1966                          * we are actually *in* fixed mode.
1967                          */
1968                         softc->max_blk = scsi_3btoul(rblim->maximum);
1969                         softc->min_blk = scsi_2btoul(rblim->minimum);
1970
1971
1972                 }
1973                 /*
1974                  * Next, perform a mode sense to determine
1975                  * current density, blocksize, compression etc.
1976                  */
1977                 error = sagetparams(periph, SA_PARAM_ALL,
1978                                     &softc->media_blksize,
1979                                     &softc->media_density,
1980                                     &softc->media_numblks,
1981                                     &softc->buffer_mode, &write_protect,
1982                                     &softc->speed, &comp_supported,
1983                                     &comp_enabled, &softc->comp_algorithm,
1984                                     NULL);
1985
1986                 if (error != 0) {
1987                         /*
1988                          * We could work a little harder here. We could
1989                          * adjust our attempts to get information. It
1990                          * might be an ancient tape drive. If someone
1991                          * nudges us, we'll do that.
1992                          */
1993                         goto exit;
1994                 }
1995
1996                 /*
1997                  * If no quirk has determined that this is a device that is
1998                  * preferred to be in fixed or variable mode, now is the time
1999                  * to find out.
2000                  */
2001                 if ((softc->quirks & (SA_QUIRK_FIXED|SA_QUIRK_VARIABLE)) == 0) {
2002                         guessing = 1;
2003                         /*
2004                          * This could be expensive to find out. Luckily we
2005                          * only need to do this once. If we start out in
2006                          * 'default' mode, try and set ourselves to one
2007                          * of the densities that would determine a wad
2008                          * of other stuff. Go from highest to lowest.
2009                          */
2010                         if (softc->media_density == SCSI_DEFAULT_DENSITY) {
2011                                 int i;
2012                                 static u_int8_t ctry[] = {
2013                                         SCSI_DENSITY_HALFINCH_PE,
2014                                         SCSI_DENSITY_HALFINCH_6250C,
2015                                         SCSI_DENSITY_HALFINCH_6250,
2016                                         SCSI_DENSITY_HALFINCH_1600,
2017                                         SCSI_DENSITY_HALFINCH_800,
2018                                         SCSI_DENSITY_QIC_4GB,
2019                                         SCSI_DENSITY_QIC_2GB,
2020                                         SCSI_DENSITY_QIC_525_320,
2021                                         SCSI_DENSITY_QIC_150,
2022                                         SCSI_DENSITY_QIC_120,
2023                                         SCSI_DENSITY_QIC_24,
2024                                         SCSI_DENSITY_QIC_11_9TRK,
2025                                         SCSI_DENSITY_QIC_11_4TRK,
2026                                         SCSI_DENSITY_QIC_1320,
2027                                         SCSI_DENSITY_QIC_3080,
2028                                         0
2029                                 };
2030                                 for (i = 0; ctry[i]; i++) {
2031                                         error = sasetparams(periph,
2032                                             SA_PARAM_DENSITY, 0, ctry[i],
2033                                             0, SF_NO_PRINT);
2034                                         if (error == 0) {
2035                                                 softc->media_density = ctry[i];
2036                                                 break;
2037                                         }
2038                                 }
2039                         }
2040                         switch (softc->media_density) {
2041                         case SCSI_DENSITY_QIC_11_4TRK:
2042                         case SCSI_DENSITY_QIC_11_9TRK:
2043                         case SCSI_DENSITY_QIC_24:
2044                         case SCSI_DENSITY_QIC_120:
2045                         case SCSI_DENSITY_QIC_150:
2046                         case SCSI_DENSITY_QIC_525_320:
2047                         case SCSI_DENSITY_QIC_1320:
2048                         case SCSI_DENSITY_QIC_3080:
2049                                 softc->quirks &= ~SA_QUIRK_2FM;
2050                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2051                                 softc->last_media_blksize = 512;
2052                                 break;
2053                         case SCSI_DENSITY_QIC_4GB:
2054                         case SCSI_DENSITY_QIC_2GB:
2055                                 softc->quirks &= ~SA_QUIRK_2FM;
2056                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2057                                 softc->last_media_blksize = 1024;
2058                                 break;
2059                         default:
2060                                 softc->last_media_blksize =
2061                                     softc->media_blksize;
2062                                 softc->quirks |= SA_QUIRK_VARIABLE;
2063                                 break;
2064                         }
2065                 }
2066
2067                 /*
2068                  * If no quirk has determined that this is a device that needs
2069                  * to have 2 Filemarks at EOD, now is the time to find out.
2070                  */
2071
2072                 if ((softc->quirks & SA_QUIRK_2FM) == 0) {
2073                         switch (softc->media_density) {
2074                         case SCSI_DENSITY_HALFINCH_800:
2075                         case SCSI_DENSITY_HALFINCH_1600:
2076                         case SCSI_DENSITY_HALFINCH_6250:
2077                         case SCSI_DENSITY_HALFINCH_6250C:
2078                         case SCSI_DENSITY_HALFINCH_PE:
2079                                 softc->quirks &= ~SA_QUIRK_1FM;
2080                                 softc->quirks |= SA_QUIRK_2FM;
2081                                 break;
2082                         default:
2083                                 break;
2084                         }
2085                 }
2086
2087                 /*
2088                  * Now validate that some info we got makes sense.
2089                  */
2090                 if ((softc->max_blk < softc->media_blksize) ||
2091                     (softc->min_blk > softc->media_blksize &&
2092                     softc->media_blksize)) {
2093                         xpt_print_path(ccb->ccb_h.path);
2094                         printf("BLOCK LIMITS (%d..%d) could not match current "
2095                             "block settings (%d)- adjusting\n", softc->min_blk,
2096                             softc->max_blk, softc->media_blksize);
2097                         softc->max_blk = softc->min_blk =
2098                             softc->media_blksize;
2099                 }
2100
2101                 /*
2102                  * Now put ourselves into the right frame of mind based
2103                  * upon quirks...
2104                  */
2105 tryagain:
2106                 /*
2107                  * If we want to be in FIXED mode and our current blocksize
2108                  * is not equal to our last blocksize (if nonzero), try and
2109                  * set ourselves to this last blocksize (as the 'preferred'
2110                  * block size).  The initial quirkmatch at registry sets the
2111                  * initial 'last' blocksize. If, for whatever reason, this
2112                  * 'last' blocksize is zero, set the blocksize to 512,
2113                  * or min_blk if that's larger.
2114                  */
2115                 if ((softc->quirks & SA_QUIRK_FIXED) &&
2116                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0 &&
2117                     (softc->media_blksize != softc->last_media_blksize)) {
2118                         softc->media_blksize = softc->last_media_blksize;
2119                         if (softc->media_blksize == 0) {
2120                                 softc->media_blksize = 512;
2121                                 if (softc->media_blksize < softc->min_blk) {
2122                                         softc->media_blksize = softc->min_blk;
2123                                 }
2124                         }
2125                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2126                             softc->media_blksize, 0, 0, SF_NO_PRINT);
2127                         if (error) {
2128                                 xpt_print_path(ccb->ccb_h.path);
2129                                 printf("unable to set fixed blocksize to %d\n",
2130                                      softc->media_blksize);
2131                                 goto exit;
2132                         }
2133                 }
2134
2135                 if ((softc->quirks & SA_QUIRK_VARIABLE) &&
2136                     (softc->media_blksize != 0)) {
2137                         softc->last_media_blksize = softc->media_blksize;
2138                         softc->media_blksize = 0;
2139                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2140                             0, 0, 0, SF_NO_PRINT);
2141                         if (error) {
2142                                 /*
2143                                  * If this fails and we were guessing, just
2144                                  * assume that we got it wrong and go try
2145                                  * fixed block mode. Don't even check against
2146                                  * density code at this point.
2147                                  */
2148                                 if (guessing) {
2149                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
2150                                         softc->quirks |= SA_QUIRK_FIXED;
2151                                         if (softc->last_media_blksize == 0)
2152                                                 softc->last_media_blksize = 512;
2153                                         goto tryagain;
2154                                 }
2155                                 xpt_print_path(ccb->ccb_h.path);
2156                                 printf("unable to set variable blocksize\n");
2157                                 goto exit;
2158                         }
2159                 }
2160
2161                 /*
2162                  * Now that we have the current block size,
2163                  * set up some parameters for sastart's usage.
2164                  */
2165                 if (softc->media_blksize) {
2166                         softc->flags |= SA_FLAG_FIXED;
2167                         if (powerof2(softc->media_blksize)) {
2168                                 softc->blk_shift =
2169                                     ffs(softc->media_blksize) - 1;
2170                                 softc->blk_mask = softc->media_blksize - 1;
2171                         } else {
2172                                 softc->blk_mask = ~0;
2173                                 softc->blk_shift = 0;
2174                         }
2175                 } else {
2176                         /*
2177                          * The SCSI-3 spec allows 0 to mean "unspecified".
2178                          * The SCSI-1 spec allows 0 to mean 'infinite'.
2179                          *
2180                          * Either works here.
2181                          */
2182                         if (softc->max_blk == 0) {
2183                                 softc->max_blk = ~0;
2184                         }
2185                         softc->blk_shift = 0;
2186                         if (softc->blk_gran != 0) {
2187                                 softc->blk_mask = softc->blk_gran - 1;
2188                         } else {
2189                                 softc->blk_mask = 0;
2190                         }
2191                 }
2192
2193                 if (write_protect)
2194                         softc->flags |= SA_FLAG_TAPE_WP;
2195
2196                 if (comp_supported) {
2197                         if (softc->saved_comp_algorithm == 0)
2198                                 softc->saved_comp_algorithm =
2199                                     softc->comp_algorithm;
2200                         softc->flags |= SA_FLAG_COMP_SUPP;
2201                         if (comp_enabled)
2202                                 softc->flags |= SA_FLAG_COMP_ENABLED;
2203                 } else
2204                         softc->flags |= SA_FLAG_COMP_UNSUPP;
2205
2206                 if ((softc->buffer_mode == SMH_SA_BUF_MODE_NOBUF) &&
2207                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0) {
2208                         error = sasetparams(periph, SA_PARAM_BUFF_MODE, 0,
2209                             0, 0, SF_NO_PRINT);
2210                         if (error == 0) {
2211                                 softc->buffer_mode = SMH_SA_BUF_MODE_SIBUF;
2212                         } else {
2213                                 xpt_print_path(ccb->ccb_h.path);
2214                                 printf("unable to set buffered mode\n");
2215                         }
2216                         error = 0;      /* not an error */
2217                 }
2218
2219
2220                 if (error == 0) {
2221                         softc->flags |= SA_FLAG_TAPE_MOUNTED;
2222                 }
2223 exit:
2224                 if (rblim != NULL)
2225                         free(rblim, M_TEMP);
2226
2227                 if (error != 0) {
2228                         softc->dsreg = MTIO_DSREG_NIL;
2229                 } else {
2230                         softc->fileno = softc->blkno = 0;
2231                         softc->dsreg = MTIO_DSREG_REST;
2232                 }
2233 #ifdef  SA_1FM_AT_EOD
2234                 if ((softc->quirks & SA_QUIRK_2FM) == 0)
2235                         softc->quirks |= SA_QUIRK_1FM;
2236 #else
2237                 if ((softc->quirks & SA_QUIRK_1FM) == 0)
2238                         softc->quirks |= SA_QUIRK_2FM;
2239 #endif
2240         } else
2241                 xpt_release_ccb(ccb);
2242
2243         /*
2244          * If we return an error, we're not mounted any more,
2245          * so release any device reservation.
2246          */
2247         if (error != 0) {
2248                 sareservereleaseunit(periph, FALSE);
2249         } else {
2250                 /*
2251                  * Clear I/O residual.
2252                  */
2253                 softc->last_io_resid = 0;
2254                 softc->last_ctl_resid = 0;
2255         }
2256         return (error);
2257 }
2258
2259 /*
2260  * How many filemarks do we need to write if we were to terminate the
2261  * tape session right now? Note that this can be a negative number
2262  */
2263
2264 static int
2265 samarkswanted(struct cam_periph *periph)
2266 {
2267         int     markswanted;
2268         struct  sa_softc *softc;
2269
2270         softc = (struct sa_softc *)periph->softc;
2271         markswanted = 0;
2272         if ((softc->flags & SA_FLAG_TAPE_WRITTEN) != 0) {
2273                 markswanted++;
2274                 if (softc->quirks & SA_QUIRK_2FM)
2275                         markswanted++;
2276         }
2277         markswanted -= softc->filemarks;
2278         return (markswanted);
2279 }
2280
2281 static int
2282 sacheckeod(struct cam_periph *periph)
2283 {
2284         int     error;
2285         int     markswanted;
2286         struct  sa_softc *softc;
2287
2288         softc = (struct sa_softc *)periph->softc;
2289         markswanted = samarkswanted(periph);
2290
2291         if (markswanted > 0) {
2292                 error = sawritefilemarks(periph, markswanted, FALSE);
2293         } else {
2294                 error = 0;
2295         }
2296         return (error);
2297 }
2298
2299 static int
2300 saerror(union ccb *ccb, u_int32_t cflgs, u_int32_t sflgs)
2301 {
2302         static const char *toobig =
2303             "%d-byte tape record bigger than supplied buffer\n";
2304         struct  cam_periph *periph;
2305         struct  sa_softc *softc;
2306         struct  ccb_scsiio *csio;
2307         struct  scsi_sense_data *sense;
2308         u_int32_t resid = 0;
2309         int32_t info = 0;
2310         cam_status status;
2311         int error_code, sense_key, asc, ascq, error, aqvalid;
2312
2313         periph = xpt_path_periph(ccb->ccb_h.path);
2314         softc = (struct sa_softc *)periph->softc;
2315         csio = &ccb->csio;
2316         sense = &csio->sense_data;
2317         scsi_extract_sense(sense, &error_code, &sense_key, &asc, &ascq);
2318         aqvalid = sense->extra_len >= 6;
2319         error = 0;
2320
2321         status = csio->ccb_h.status & CAM_STATUS_MASK;
2322
2323         /*
2324          * Calculate/latch up, any residuals... We do this in a funny 2-step
2325          * so we can print stuff here if we have CAM_DEBUG enabled for this
2326          * unit.
2327          */
2328         if (status == CAM_SCSI_STATUS_ERROR) {
2329                 if ((sense->error_code & SSD_ERRCODE_VALID) != 0) {
2330                         info = (int32_t) scsi_4btoul(sense->info);
2331                         resid = info;
2332                         if ((softc->flags & SA_FLAG_FIXED) != 0)
2333                                 resid *= softc->media_blksize;
2334                 } else {
2335                         resid = csio->dxfer_len;
2336                         info = resid;
2337                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
2338                                 if (softc->media_blksize)
2339                                         info /= softc->media_blksize;
2340                         }
2341                 }
2342                 if (CCB_Type(csio) == SA_CCB_BUFFER_IO) {
2343                         bcopy((caddr_t) sense, (caddr_t) &softc->last_io_sense,
2344                             sizeof (struct scsi_sense_data));
2345                         bcopy(csio->cdb_io.cdb_bytes, softc->last_io_cdb,
2346                             (int) csio->cdb_len);
2347                         softc->last_io_resid = resid;
2348                         softc->last_resid_was_io = 1;
2349                 } else {
2350                         bcopy((caddr_t) sense, (caddr_t) &softc->last_ctl_sense,
2351                             sizeof (struct scsi_sense_data));
2352                         bcopy(csio->cdb_io.cdb_bytes, softc->last_ctl_cdb,
2353                             (int) csio->cdb_len);
2354                         softc->last_ctl_resid = resid;
2355                         softc->last_resid_was_io = 0;
2356                 }
2357                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("CDB[0]=0x%x Key 0x%x "
2358                     "ASC/ASCQ 0x%x/0x%x CAM STATUS 0x%x flags 0x%x resid %d "
2359                     "dxfer_len %d\n", csio->cdb_io.cdb_bytes[0] & 0xff,
2360                     sense_key, asc, ascq, status,
2361                     sense->flags & ~SSD_KEY_RESERVED, resid, csio->dxfer_len));
2362         } else {
2363                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
2364                     ("Cam Status 0x%x\n", status));
2365         }
2366
2367         switch (status) {
2368         case CAM_REQ_CMP:
2369                 return (0);
2370         case CAM_SCSI_STATUS_ERROR:
2371                 /*
2372                  * If a read/write command, we handle it here.
2373                  */
2374                 if (CCB_Type(csio) != SA_CCB_WAITING) {
2375                         break;
2376                 }
2377                 /*
2378                  * If this was just EOM/EOP, Filemark, Setmark or ILI detected
2379                  * on a non read/write command, we assume it's not an error
2380                  * and propagate the residule and return.
2381                  */
2382                 if ((aqvalid && asc == 0 && ascq > 0 && ascq <= 5) ||
2383                     (aqvalid == 0 && sense_key == SSD_KEY_NO_SENSE)) {
2384                         csio->resid = resid;
2385                         QFRLS(ccb);
2386                         return (0);
2387                 }
2388                 /*
2389                  * Otherwise, we let the common code handle this.
2390                  */
2391                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2392
2393         /*
2394          * XXX: To Be Fixed
2395          * We cannot depend upon CAM honoring retry counts for these.
2396          */
2397         case CAM_SCSI_BUS_RESET:
2398         case CAM_BDR_SENT:
2399                 if (ccb->ccb_h.retry_count <= 0) {
2400                         return (EIO);
2401                         break;
2402                 }
2403                 /* FALLTHROUGH */
2404         default:
2405                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2406         }
2407
2408         /*
2409          * Handle filemark, end of tape, mismatched record sizes....
2410          * From this point out, we're only handling read/write cases.
2411          * Handle writes && reads differently.
2412          */
2413
2414         if (csio->cdb_io.cdb_bytes[0] == SA_WRITE) {
2415                 if (sense_key == SSD_KEY_VOLUME_OVERFLOW) {
2416                         csio->resid = resid;
2417                         error = ENOSPC;
2418                 } else if (sense->flags & SSD_EOM) {
2419                         softc->flags |= SA_FLAG_EOM_PENDING;
2420                         /*
2421                          * Grotesque as it seems, the few times
2422                          * I've actually seen a non-zero resid,
2423                          * the tape drive actually lied and had
2424                          * writtent all the data!.
2425                          */
2426                         csio->resid = 0;
2427                 }
2428         } else {
2429                 csio->resid = resid;
2430                 if (sense_key == SSD_KEY_BLANK_CHECK) {
2431                         if (softc->quirks & SA_QUIRK_1FM) {
2432                                 error = 0;
2433                                 softc->flags |= SA_FLAG_EOM_PENDING;
2434                         } else {
2435                                 error = EIO;
2436                         }
2437                 } else if (sense->flags & SSD_FILEMARK) {
2438                         if (softc->flags & SA_FLAG_FIXED) {
2439                                 error = -1;
2440                                 softc->flags |= SA_FLAG_EOF_PENDING;
2441                         }
2442                         /*
2443                          * Unconditionally, if we detected a filemark on a read,
2444                          * mark that we've run moved a file ahead.
2445                          */
2446                         if (softc->fileno != (daddr_t) -1) {
2447                                 softc->fileno++;
2448                                 softc->blkno = 0;
2449                                 csio->ccb_h.ccb_pflags |= SA_POSITION_UPDATED;
2450                         }
2451                 }
2452         }
2453
2454         /*
2455          * Incorrect Length usually applies to read, but can apply to writes.
2456          */
2457         if (error == 0 && (sense->flags & SSD_ILI)) {
2458                 if (info < 0) {
2459                         xpt_print_path(csio->ccb_h.path);
2460                         printf(toobig, csio->dxfer_len - info);
2461                         csio->resid = csio->dxfer_len;
2462                         error = EIO;
2463                 } else {
2464                         csio->resid = resid;
2465                         if (softc->flags & SA_FLAG_FIXED) {
2466                                 softc->flags |= SA_FLAG_EIO_PENDING;
2467                         }
2468                         /*
2469                          * Bump the block number if we hadn't seen a filemark.
2470                          * Do this independent of errors (we've moved anyway).
2471                          */
2472                         if ((sense->flags & SSD_FILEMARK) == 0) {
2473                                 if (softc->blkno != (daddr_t) -1) {
2474                                         softc->blkno++;
2475                                         csio->ccb_h.ccb_pflags |=
2476                                            SA_POSITION_UPDATED;
2477                                 }
2478                         }
2479                 }
2480         }
2481
2482         if (error <= 0) {
2483                 /*
2484                  * Unfreeze the queue if frozen as we're not returning anything
2485                  * to our waiters that would indicate an I/O error has occurred
2486                  * (yet).
2487                  */
2488                 QFRLS(ccb);
2489                 error = 0;
2490         }
2491         return (error);
2492 }
2493
2494 static int
2495 sagetparams(struct cam_periph *periph, sa_params params_to_get,
2496             u_int32_t *blocksize, u_int8_t *density, u_int32_t *numblocks,
2497             int *buff_mode, u_int8_t *write_protect, u_int8_t *speed,
2498             int *comp_supported, int *comp_enabled, u_int32_t *comp_algorithm,
2499             sa_comp_t *tcs)
2500 {
2501         union ccb *ccb;
2502         void *mode_buffer;
2503         struct scsi_mode_header_6 *mode_hdr;
2504         struct scsi_mode_blk_desc *mode_blk;
2505         int mode_buffer_len;
2506         struct sa_softc *softc;
2507         u_int8_t cpage;
2508         int error;
2509         cam_status status;
2510
2511         softc = (struct sa_softc *)periph->softc;
2512         ccb = cam_periph_getccb(periph, 1);
2513         if (softc->quirks & SA_QUIRK_NO_CPAGE)
2514                 cpage = SA_DEVICE_CONFIGURATION_PAGE;
2515         else
2516                 cpage = SA_DATA_COMPRESSION_PAGE;
2517
2518 retry:
2519         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2520
2521         if (params_to_get & SA_PARAM_COMPRESSION) {
2522                 if (softc->quirks & SA_QUIRK_NOCOMP) {
2523                         *comp_supported = FALSE;
2524                         params_to_get &= ~SA_PARAM_COMPRESSION;
2525                 } else
2526                         mode_buffer_len += sizeof (sa_comp_t);
2527         }
2528
2529         mode_buffer = malloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2530         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2531         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2532
2533         /* it is safe to retry this */
2534         scsi_mode_sense(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2535             SMS_PAGE_CTRL_CURRENT, (params_to_get & SA_PARAM_COMPRESSION) ?
2536             cpage : SMS_VENDOR_SPECIFIC_PAGE, mode_buffer, mode_buffer_len,
2537             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2538
2539         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2540             &softc->device_stats);
2541         QFRLS(ccb);
2542
2543         status = ccb->ccb_h.status & CAM_STATUS_MASK;
2544
2545         if (error == EINVAL && (params_to_get & SA_PARAM_COMPRESSION) != 0) {
2546                 /*
2547                  * Hmm. Let's see if we can try another page...
2548                  * If we've already done that, give up on compression
2549                  * for this device and remember this for the future
2550                  * and attempt the request without asking for compression
2551                  * info.
2552                  */
2553                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2554                         cpage = SA_DEVICE_CONFIGURATION_PAGE;
2555                         goto retry;
2556                 }
2557                 softc->quirks |= SA_QUIRK_NOCOMP;
2558                 free(mode_buffer, M_TEMP);
2559                 goto retry;
2560         } else if (status == CAM_SCSI_STATUS_ERROR) {
2561                 /* Tell the user about the fatal error. */
2562                 scsi_sense_print(&ccb->csio);
2563                 goto sagetparamsexit;
2564         }
2565
2566         /*
2567          * If the user only wants the compression information, and
2568          * the device doesn't send back the block descriptor, it's
2569          * no big deal.  If the user wants more than just
2570          * compression, though, and the device doesn't pass back the
2571          * block descriptor, we need to send another mode sense to
2572          * get the block descriptor.
2573          */
2574         if ((mode_hdr->blk_desc_len == 0) &&
2575             (params_to_get & SA_PARAM_COMPRESSION) &&
2576             (params_to_get & ~(SA_PARAM_COMPRESSION))) {
2577
2578                 /*
2579                  * Decrease the mode buffer length by the size of
2580                  * the compression page, to make sure the data
2581                  * there doesn't get overwritten.
2582                  */
2583                 mode_buffer_len -= sizeof (sa_comp_t);
2584
2585                 /*
2586                  * Now move the compression page that we presumably
2587                  * got back down the memory chunk a little bit so
2588                  * it doesn't get spammed.
2589                  */
2590                 bcopy(&mode_hdr[0], &mode_hdr[1], sizeof (sa_comp_t));
2591                 bzero(&mode_hdr[0], sizeof (mode_hdr[0]));
2592
2593                 /*
2594                  * Now, we issue another mode sense and just ask
2595                  * for the block descriptor, etc.
2596                  */
2597
2598                 scsi_mode_sense(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2599                     SMS_PAGE_CTRL_CURRENT, SMS_VENDOR_SPECIFIC_PAGE,
2600                     mode_buffer, mode_buffer_len, SSD_FULL_SIZE,
2601                     SCSIOP_TIMEOUT);
2602
2603                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2604                     &softc->device_stats);
2605                 QFRLS(ccb);
2606
2607                 if (error != 0)
2608                         goto sagetparamsexit;
2609         }
2610
2611         if (params_to_get & SA_PARAM_BLOCKSIZE)
2612                 *blocksize = scsi_3btoul(mode_blk->blklen);
2613
2614         if (params_to_get & SA_PARAM_NUMBLOCKS)
2615                 *numblocks = scsi_3btoul(mode_blk->nblocks);
2616
2617         if (params_to_get & SA_PARAM_BUFF_MODE)
2618                 *buff_mode = mode_hdr->dev_spec & SMH_SA_BUF_MODE_MASK;
2619
2620         if (params_to_get & SA_PARAM_DENSITY)
2621                 *density = mode_blk->density;
2622
2623         if (params_to_get & SA_PARAM_WP)
2624                 *write_protect = (mode_hdr->dev_spec & SMH_SA_WP)? TRUE : FALSE;
2625
2626         if (params_to_get & SA_PARAM_SPEED)
2627                 *speed = mode_hdr->dev_spec & SMH_SA_SPEED_MASK;
2628
2629         if (params_to_get & SA_PARAM_COMPRESSION) {
2630                 sa_comp_t *ntcs = (sa_comp_t *) &mode_blk[1];
2631                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2632                         struct scsi_data_compression_page *cp = &ntcs->dcomp;
2633                         *comp_supported =
2634                             (cp->dce_and_dcc & SA_DCP_DCC)? TRUE : FALSE;
2635                         *comp_enabled =
2636                             (cp->dce_and_dcc & SA_DCP_DCE)? TRUE : FALSE;
2637                         *comp_algorithm = scsi_4btoul(cp->comp_algorithm);
2638                 } else {
2639                         struct scsi_dev_conf_page *cp = &ntcs->dconf;
2640                         /*
2641                          * We don't really know whether this device supports
2642                          * Data Compression if the the algorithm field is
2643                          * zero. Just say we do.
2644                          */
2645                         *comp_supported = TRUE;
2646                         *comp_enabled =
2647                             (cp->sel_comp_alg != SA_COMP_NONE)? TRUE : FALSE;
2648                         *comp_algorithm = cp->sel_comp_alg;
2649                 }
2650                 if (tcs != NULL)
2651                         bcopy(ntcs, tcs, sizeof (sa_comp_t));
2652         }
2653
2654         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2655                 int idx;
2656                 char *xyz = mode_buffer;
2657                 xpt_print_path(periph->path);
2658                 printf("Mode Sense Data=");
2659                 for (idx = 0; idx < mode_buffer_len; idx++)
2660                         printf(" 0x%02x", xyz[idx] & 0xff);
2661                 printf("\n");
2662         }
2663
2664 sagetparamsexit:
2665
2666         xpt_release_ccb(ccb);
2667         free(mode_buffer, M_TEMP);
2668         return (error);
2669 }
2670
2671 /*
2672  * The purpose of this function is to set one of four different parameters
2673  * for a tape drive:
2674  *      - blocksize
2675  *      - density
2676  *      - compression / compression algorithm
2677  *      - buffering mode
2678  *
2679  * The assumption is that this will be called from saioctl(), and therefore
2680  * from a process context.  Thus the waiting malloc calls below.  If that
2681  * assumption ever changes, the malloc calls should be changed to be
2682  * NOWAIT mallocs.
2683  *
2684  * Any or all of the four parameters may be set when this function is
2685  * called.  It should handle setting more than one parameter at once.
2686  */
2687 static int
2688 sasetparams(struct cam_periph *periph, sa_params params_to_set,
2689             u_int32_t blocksize, u_int8_t density, u_int32_t calg,
2690             u_int32_t sense_flags)
2691 {
2692         struct sa_softc *softc;
2693         u_int32_t current_blocksize;
2694         u_int32_t current_calg;
2695         u_int8_t current_density;
2696         u_int8_t current_speed;
2697         int comp_enabled, comp_supported;
2698         void *mode_buffer;
2699         int mode_buffer_len;
2700         struct scsi_mode_header_6 *mode_hdr;
2701         struct scsi_mode_blk_desc *mode_blk;
2702         sa_comp_t *ccomp, *cpage;
2703         int buff_mode;
2704         union ccb *ccb = NULL;
2705         int error;
2706
2707         softc = (struct sa_softc *)periph->softc;
2708
2709         ccomp = malloc(sizeof (sa_comp_t), M_TEMP, M_INTWAIT);
2710
2711         /*
2712          * Since it doesn't make sense to set the number of blocks, or
2713          * write protection, we won't try to get the current value.  We
2714          * always want to get the blocksize, so we can set it back to the
2715          * proper value.
2716          */
2717         error = sagetparams(periph,
2718             params_to_set | SA_PARAM_BLOCKSIZE | SA_PARAM_SPEED,
2719             &current_blocksize, &current_density, NULL, &buff_mode, NULL,
2720             &current_speed, &comp_supported, &comp_enabled,
2721             &current_calg, ccomp);
2722
2723         if (error != 0) {
2724                 free(ccomp, M_TEMP);
2725                 return (error);
2726         }
2727
2728         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2729         if (params_to_set & SA_PARAM_COMPRESSION)
2730                 mode_buffer_len += sizeof (sa_comp_t);
2731
2732         mode_buffer = malloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2733
2734         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2735         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2736
2737         ccb = cam_periph_getccb(periph, 1);
2738
2739 retry:
2740
2741         if (params_to_set & SA_PARAM_COMPRESSION) {
2742                 if (mode_blk) {
2743                         cpage = (sa_comp_t *)&mode_blk[1];
2744                 } else {
2745                         cpage = (sa_comp_t *)&mode_hdr[1];
2746                 }
2747                 bcopy(ccomp, cpage, sizeof (sa_comp_t));
2748                 cpage->hdr.pagecode &= ~0x80;
2749         } else
2750                 cpage = NULL;
2751
2752         /*
2753          * If the caller wants us to set the blocksize, use the one they
2754          * pass in.  Otherwise, use the blocksize we got back from the
2755          * mode select above.
2756          */
2757         if (mode_blk) {
2758                 if (params_to_set & SA_PARAM_BLOCKSIZE)
2759                         scsi_ulto3b(blocksize, mode_blk->blklen);
2760                 else
2761                         scsi_ulto3b(current_blocksize, mode_blk->blklen);
2762
2763                 /*
2764                  * Set density if requested, else preserve old density.
2765                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2766                  * devices, else density we've latched up in our softc.
2767                  */
2768                 if (params_to_set & SA_PARAM_DENSITY) {
2769                         mode_blk->density = density;
2770                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2771                         mode_blk->density = SCSI_SAME_DENSITY;
2772                 } else {
2773                         mode_blk->density = softc->media_density;
2774                 }
2775         }
2776
2777         /*
2778          * For mode selects, these two fields must be zero.
2779          */
2780         mode_hdr->data_length = 0;
2781         mode_hdr->medium_type = 0;
2782
2783         /* set the speed to the current value */
2784         mode_hdr->dev_spec = current_speed;
2785
2786         /* set single-initiator buffering mode */
2787         mode_hdr->dev_spec |= SMH_SA_BUF_MODE_SIBUF;
2788
2789         if (mode_blk)
2790                 mode_hdr->blk_desc_len = sizeof(struct scsi_mode_blk_desc);
2791         else
2792                 mode_hdr->blk_desc_len = 0;
2793
2794         /*
2795          * First, if the user wants us to set the compression algorithm or
2796          * just turn compression on, check to make sure that this drive
2797          * supports compression.
2798          */
2799         if (params_to_set & SA_PARAM_COMPRESSION) {
2800                 /*
2801                  * If the compression algorithm is 0, disable compression.
2802                  * If the compression algorithm is non-zero, enable
2803                  * compression and set the compression type to the
2804                  * specified compression algorithm, unless the algorithm is
2805                  * MT_COMP_ENABLE.  In that case, we look at the
2806                  * compression algorithm that is currently set and if it is
2807                  * non-zero, we leave it as-is.  If it is zero, and we have
2808                  * saved a compression algorithm from a time when
2809                  * compression was enabled before, set the compression to
2810                  * the saved value.
2811                  */
2812                 switch (ccomp->hdr.pagecode & ~0x80) {
2813                 case SA_DATA_COMPRESSION_PAGE:
2814                 if (ccomp->dcomp.dce_and_dcc & SA_DCP_DCC) {
2815                         struct scsi_data_compression_page *dcp = &cpage->dcomp;
2816                         if (calg == 0) {
2817                                 /*
2818                                  * Disable compression, but leave the
2819                                  * decompression and the capability bit
2820                                  * alone.
2821                                  */
2822                                 dcp->dce_and_dcc = SA_DCP_DCC;
2823                                 dcp->dde_and_red |= SA_DCP_DDE;
2824                                 break;
2825                         }
2826                         /* enable compression && decompression */
2827                         dcp->dce_and_dcc = SA_DCP_DCE | SA_DCP_DCC;
2828                         dcp->dde_and_red |= SA_DCP_DDE;
2829                         /*
2830                          * If there, use compression algorithm from caller.
2831                          * Otherwise, if there's a saved compression algorithm
2832                          * and there is no current algorithm, use the saved
2833                          * algorithm. Else parrot back what we got and hope
2834                          * for the best.
2835                          */
2836                         if (calg != MT_COMP_ENABLE) {
2837                                 scsi_ulto4b(calg, dcp->comp_algorithm);
2838                                 scsi_ulto4b(calg, dcp->decomp_algorithm);
2839                         } else if (scsi_4btoul(dcp->comp_algorithm) == 0 &&
2840                             softc->saved_comp_algorithm != 0) {
2841                                 scsi_ulto4b(softc->saved_comp_algorithm,
2842                                     dcp->comp_algorithm);
2843                                 scsi_ulto4b(softc->saved_comp_algorithm,
2844                                     dcp->decomp_algorithm);
2845                         }
2846                         break;
2847                 }
2848                 case SA_DEVICE_CONFIGURATION_PAGE:
2849                 {
2850                         struct scsi_dev_conf_page *dcp = &cpage->dconf;
2851                         if (calg == 0) {
2852                                 dcp->sel_comp_alg = SA_COMP_NONE;
2853                                 break;
2854                         }
2855                         if (calg != MT_COMP_ENABLE) {
2856                                 dcp->sel_comp_alg = calg;
2857                         } else if (dcp->sel_comp_alg == SA_COMP_NONE &&
2858                             softc->saved_comp_algorithm != 0) {
2859                                 dcp->sel_comp_alg = softc->saved_comp_algorithm;
2860                         }
2861                         break;
2862                 }
2863                 default:
2864                         /*
2865                          * The drive doesn't seem to support compression,
2866                          * so turn off the set compression bit.
2867                          */
2868                         params_to_set &= ~SA_PARAM_COMPRESSION;
2869                         xpt_print_path(periph->path);
2870                         printf("device does not seem to support compression\n");
2871
2872                         /*
2873                          * If that was the only thing the user wanted us to set,
2874                          * clean up allocated resources and return with
2875                          * 'operation not supported'.
2876                          */
2877                         if (params_to_set == SA_PARAM_NONE) {
2878                                 free(mode_buffer, M_TEMP);
2879                                 xpt_release_ccb(ccb);
2880                                 return (ENODEV);
2881                         }
2882
2883                         /*
2884                          * That wasn't the only thing the user wanted us to set.
2885                          * So, decrease the stated mode buffer length by the
2886                          * size of the compression mode page.
2887                          */
2888                         mode_buffer_len -= sizeof(sa_comp_t);
2889                 }
2890         }
2891
2892         /* It is safe to retry this operation */
2893         scsi_mode_select(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
2894             (params_to_set & SA_PARAM_COMPRESSION)? TRUE : FALSE,
2895             FALSE, mode_buffer, mode_buffer_len, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2896
2897         error = cam_periph_runccb(ccb, saerror, 0,
2898             sense_flags, &softc->device_stats);
2899         QFRLS(ccb);
2900
2901         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2902                 int idx;
2903                 char *xyz = mode_buffer;
2904                 xpt_print_path(periph->path);
2905                 printf("Err%d, Mode Select Data=", error);
2906                 for (idx = 0; idx < mode_buffer_len; idx++)
2907                         printf(" 0x%02x", xyz[idx] & 0xff);
2908                 printf("\n");
2909         }
2910
2911
2912         if (error) {
2913                 /*
2914                  * If we can, try without setting density/blocksize.
2915                  */
2916                 if (mode_blk) {
2917                         if ((params_to_set &
2918                             (SA_PARAM_DENSITY|SA_PARAM_BLOCKSIZE)) == 0) {
2919                                 mode_blk = NULL;
2920                                 goto retry;
2921                         }
2922                 } else {
2923                         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2924                         cpage = (sa_comp_t *)&mode_blk[1];
2925                 }
2926
2927                 /*
2928                  * If we were setting the blocksize, and that failed, we
2929                  * want to set it to its original value.  If we weren't
2930                  * setting the blocksize, we don't want to change it.
2931                  */
2932                 scsi_ulto3b(current_blocksize, mode_blk->blklen);
2933
2934                 /*
2935                  * Set density if requested, else preserve old density.
2936                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2937                  * devices, else density we've latched up in our softc.
2938                  */
2939                 if (params_to_set & SA_PARAM_DENSITY) {
2940                         mode_blk->density = current_density;
2941                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2942                         mode_blk->density = SCSI_SAME_DENSITY;
2943                 } else {
2944                         mode_blk->density = softc->media_density;
2945                 }
2946
2947                 if (params_to_set & SA_PARAM_COMPRESSION)
2948                         bcopy(ccomp, cpage, sizeof (sa_comp_t));
2949
2950                 /*
2951                  * The retry count is the only CCB field that might have been
2952                  * changed that we care about, so reset it back to 1.
2953                  */
2954                 ccb->ccb_h.retry_count = 1;
2955                 cam_periph_runccb(ccb, saerror, 0, sense_flags,
2956                     &softc->device_stats);
2957                 QFRLS(ccb);
2958         }
2959
2960         xpt_release_ccb(ccb);
2961
2962         if (ccomp != NULL)
2963                 free(ccomp, M_TEMP);
2964
2965         if (params_to_set & SA_PARAM_COMPRESSION) {
2966                 if (error) {
2967                         softc->flags &= ~SA_FLAG_COMP_ENABLED;
2968                         /*
2969                          * Even if we get an error setting compression,
2970                          * do not say that we don't support it. We could
2971                          * have been wrong, or it may be media specific.
2972                          *      softc->flags &= ~SA_FLAG_COMP_SUPP;
2973                          */
2974                         softc->saved_comp_algorithm = softc->comp_algorithm;
2975                         softc->comp_algorithm = 0;
2976                 } else {
2977                         softc->flags |= SA_FLAG_COMP_ENABLED;
2978                         softc->comp_algorithm = calg;
2979                 }
2980         }
2981
2982         free(mode_buffer, M_TEMP);
2983         return (error);
2984 }
2985
2986 static void
2987 saprevent(struct cam_periph *periph, int action)
2988 {
2989         struct  sa_softc *softc;
2990         union   ccb *ccb;
2991         int     error, sf;
2992
2993         softc = (struct sa_softc *)periph->softc;
2994
2995         if ((action == PR_ALLOW) && (softc->flags & SA_FLAG_TAPE_LOCKED) == 0)
2996                 return;
2997         if ((action == PR_PREVENT) && (softc->flags & SA_FLAG_TAPE_LOCKED) != 0)
2998                 return;
2999
3000         /*
3001          * We can be quiet about illegal requests.
3002          */
3003         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
3004                 sf = 0;
3005         } else
3006                 sf = SF_QUIET_IR;
3007
3008         ccb = cam_periph_getccb(periph, 1);
3009
3010         /* It is safe to retry this operation */
3011         scsi_prevent(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, action,
3012             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3013
3014         error = cam_periph_runccb(ccb, saerror, 0, sf, &softc->device_stats);
3015         QFRLS(ccb);
3016         if (error == 0) {
3017                 if (action == PR_ALLOW)
3018                         softc->flags &= ~SA_FLAG_TAPE_LOCKED;
3019                 else
3020                         softc->flags |= SA_FLAG_TAPE_LOCKED;
3021         }
3022
3023         xpt_release_ccb(ccb);
3024 }
3025
3026 static int
3027 sarewind(struct cam_periph *periph)
3028 {
3029         union   ccb *ccb;
3030         struct  sa_softc *softc;
3031         int     error;
3032
3033         softc = (struct sa_softc *)periph->softc;
3034
3035         ccb = cam_periph_getccb(periph, 1);
3036
3037         /* It is safe to retry this operation */
3038         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3039             SSD_FULL_SIZE, REWIND_TIMEOUT);
3040
3041         softc->dsreg = MTIO_DSREG_REW;
3042         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3043         softc->dsreg = MTIO_DSREG_REST;
3044
3045         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3046                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3047
3048         xpt_release_ccb(ccb);
3049         if (error == 0)
3050                 softc->fileno = softc->blkno = (daddr_t) 0;
3051         else
3052                 softc->fileno = softc->blkno = (daddr_t) -1;
3053         return (error);
3054 }
3055
3056 static int
3057 saspace(struct cam_periph *periph, int count, scsi_space_code code)
3058 {
3059         union   ccb *ccb;
3060         struct  sa_softc *softc;
3061         int     error;
3062
3063         softc = (struct sa_softc *)periph->softc;
3064
3065         ccb = cam_periph_getccb(periph, 1);
3066
3067         /* This cannot be retried */
3068
3069         scsi_space(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG, code, count,
3070             SSD_FULL_SIZE, SPACE_TIMEOUT);
3071
3072         /*
3073          * Clear residual because we will be using it.
3074          */
3075         softc->last_ctl_resid = 0;
3076
3077         softc->dsreg = (count < 0)? MTIO_DSREG_REV : MTIO_DSREG_FWD;
3078         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3079         softc->dsreg = MTIO_DSREG_REST;
3080
3081         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3082                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3083
3084         xpt_release_ccb(ccb);
3085
3086         /*
3087          * If a spacing operation has failed, we need to invalidate
3088          * this mount.
3089          *
3090          * If the spacing operation was setmarks or to end of recorded data,
3091          * we no longer know our relative position.
3092          *
3093          * If the spacing operations was spacing files in reverse, we
3094          * take account of the residual, but still check against less
3095          * than zero- if we've gone negative, we must have hit BOT.
3096          *
3097          * If the spacing operations was spacing records in reverse and
3098          * we have a residual, we've either hit BOT or hit a filemark.
3099          * In the former case, we know our new record number (0). In
3100          * the latter case, we have absolutely no idea what the real
3101          * record number is- we've stopped between the end of the last
3102          * record in the previous file and the filemark that stopped
3103          * our spacing backwards.
3104          */
3105         if (error) {
3106                 softc->fileno = softc->blkno = (daddr_t) -1;
3107         } else if (code == SS_SETMARKS || code == SS_EOD) {
3108                 softc->fileno = softc->blkno = (daddr_t) -1;
3109         } else if (code == SS_FILEMARKS && softc->fileno != (daddr_t) -1) {
3110                 softc->fileno += (count - softc->last_ctl_resid);
3111                 if (softc->fileno < 0)  /* we must of hit BOT */
3112                         softc->fileno = 0;
3113                 softc->blkno = 0;
3114         } else if (code == SS_BLOCKS && softc->blkno != (daddr_t) -1) {
3115                 softc->blkno += (count - softc->last_ctl_resid);
3116                 if (count < 0) {
3117                         if (softc->last_ctl_resid || softc->blkno < 0) {
3118                                 if (softc->fileno == 0) {
3119                                         softc->blkno = 0;
3120                                 } else {
3121                                         softc->blkno = (daddr_t) -1;
3122                                 }
3123                         }
3124                 }
3125         }
3126         return (error);
3127 }
3128
3129 static int
3130 sawritefilemarks(struct cam_periph *periph, int nmarks, int setmarks)
3131 {
3132         union   ccb *ccb;
3133         struct  sa_softc *softc;
3134         int     error, nwm = 0;
3135
3136         softc = (struct sa_softc *)periph->softc;
3137
3138         ccb = cam_periph_getccb(periph, 1);
3139         /*
3140          * Clear residual because we will be using it.
3141          */
3142         softc->last_ctl_resid = 0;
3143
3144         softc->dsreg = MTIO_DSREG_FMK;
3145         /* this *must* not be retried */
3146         scsi_write_filemarks(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG,
3147             FALSE, setmarks, nmarks, SSD_FULL_SIZE, IO_TIMEOUT);
3148         softc->dsreg = MTIO_DSREG_REST;
3149
3150
3151         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3152
3153         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3154                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3155
3156         if (error == 0 && nmarks) {
3157                 struct sa_softc *softc = (struct sa_softc *)periph->softc;
3158                 nwm = nmarks - softc->last_ctl_resid;
3159                 softc->filemarks += nwm;
3160         }
3161
3162         xpt_release_ccb(ccb);
3163
3164         /*
3165          * Update relative positions (if we're doing that).
3166          */
3167         if (error) {
3168                 softc->fileno = softc->blkno = (daddr_t) -1;
3169         } else if (softc->fileno != (daddr_t) -1) {
3170                 softc->fileno += nwm;
3171                 softc->blkno = 0;
3172         }
3173         return (error);
3174 }
3175
3176 static int
3177 sardpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3178 {
3179         struct scsi_tape_position_data loc;
3180         union ccb *ccb;
3181         struct sa_softc *softc = (struct sa_softc *)periph->softc;
3182         int error;
3183
3184         /*
3185          * We try and flush any buffered writes here if we were writing
3186          * and we're trying to get hardware block position. It eats
3187          * up performance substantially, but I'm wary of drive firmware.
3188          *
3189          * I think that *logical* block position is probably okay-
3190          * but hardware block position might have to wait for data
3191          * to hit media to be valid. Caveat Emptor.
3192          */
3193
3194         if (hard && (softc->flags & SA_FLAG_TAPE_WRITTEN)) {
3195                 error = sawritefilemarks(periph, 0, 0);
3196                 if (error && error != EACCES)
3197                         return (error);
3198         }
3199
3200         ccb = cam_periph_getccb(periph, 1);
3201         scsi_read_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3202             hard, &loc, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3203         softc->dsreg = MTIO_DSREG_RBSY;
3204         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3205         softc->dsreg = MTIO_DSREG_REST;
3206         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3207                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3208
3209         if (error == 0) {
3210                 if (loc.flags & SA_RPOS_UNCERTAIN) {
3211                         error = EINVAL;         /* nothing is certain */
3212                 } else {
3213                         *blkptr = scsi_4btoul(loc.firstblk);
3214                 }
3215         }
3216
3217         xpt_release_ccb(ccb);
3218         return (error);
3219 }
3220
3221 static int
3222 sasetpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3223 {
3224         union ccb *ccb;
3225         struct sa_softc *softc;
3226         int error;
3227
3228         /*
3229          * We used to try and flush any buffered writes here.
3230          * Now we push this onto user applications to either
3231          * flush the pending writes themselves (via a zero count
3232          * WRITE FILEMARKS command) or they can trust their tape
3233          * drive to do this correctly for them.
3234          */
3235
3236         softc = (struct sa_softc *)periph->softc;
3237         ccb = cam_periph_getccb(periph, 1);
3238
3239
3240         scsi_set_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3241             hard, *blkptr, SSD_FULL_SIZE, SPACE_TIMEOUT);
3242
3243
3244         softc->dsreg = MTIO_DSREG_POS;
3245         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3246         softc->dsreg = MTIO_DSREG_REST;
3247         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3248                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3249         xpt_release_ccb(ccb);
3250         /*
3251          * Note relative file && block number position as now unknown.
3252          */
3253         softc->fileno = softc->blkno = (daddr_t) -1;
3254         return (error);
3255 }
3256
3257 static int
3258 saretension(struct cam_periph *periph)
3259 {
3260         union ccb *ccb;
3261         struct sa_softc *softc;
3262         int error;
3263
3264         softc = (struct sa_softc *)periph->softc;
3265
3266         ccb = cam_periph_getccb(periph, 1);
3267
3268         /* It is safe to retry this operation */
3269         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3270             FALSE, TRUE,  TRUE, SSD_FULL_SIZE, ERASE_TIMEOUT);
3271
3272         softc->dsreg = MTIO_DSREG_TEN;
3273         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3274         softc->dsreg = MTIO_DSREG_REST;
3275
3276         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3277                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3278         xpt_release_ccb(ccb);
3279         if (error == 0)
3280                 softc->fileno = softc->blkno = (daddr_t) 0;
3281         else
3282                 softc->fileno = softc->blkno = (daddr_t) -1;
3283         return (error);
3284 }
3285
3286 static int
3287 sareservereleaseunit(struct cam_periph *periph, int reserve)
3288 {
3289         union ccb *ccb;
3290         struct sa_softc *softc;
3291         int error;
3292
3293         softc = (struct sa_softc *)periph->softc;
3294         ccb = cam_periph_getccb(periph,  1);
3295
3296         /* It is safe to retry this operation */
3297         scsi_reserve_release_unit(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
3298             FALSE,  0, SSD_FULL_SIZE,  SCSIOP_TIMEOUT, reserve);
3299         softc->dsreg = MTIO_DSREG_RBSY;
3300         error = cam_periph_runccb(ccb, saerror, 0,
3301             SF_RETRY_UA | SF_NO_PRINT, &softc->device_stats);
3302         softc->dsreg = MTIO_DSREG_REST;
3303         QFRLS(ccb);
3304         xpt_release_ccb(ccb);
3305
3306         /*
3307          * If the error was Illegal Request, then the device doesn't support
3308          * RESERVE/RELEASE. This is not an error.
3309          */
3310         if (error == EINVAL) {
3311                 error = 0;
3312         }
3313
3314         return (error);
3315 }
3316
3317 static int
3318 saloadunload(struct cam_periph *periph, int load)
3319 {
3320         union   ccb *ccb;
3321         struct  sa_softc *softc;
3322         int     error;
3323
3324         softc = (struct sa_softc *)periph->softc;
3325
3326         ccb = cam_periph_getccb(periph, 1);
3327
3328         /* It is safe to retry this operation */
3329         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3330             FALSE, FALSE, load, SSD_FULL_SIZE, REWIND_TIMEOUT);
3331
3332         softc->dsreg = (load)? MTIO_DSREG_LD : MTIO_DSREG_UNL;
3333         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3334         softc->dsreg = MTIO_DSREG_REST;
3335         QFRLS(ccb);
3336         xpt_release_ccb(ccb);
3337
3338         if (error || load == 0)
3339                 softc->fileno = softc->blkno = (daddr_t) -1;
3340         else if (error == 0)
3341                 softc->fileno = softc->blkno = (daddr_t) 0;
3342         return (error);
3343 }
3344
3345 static int
3346 saerase(struct cam_periph *periph, int longerase)
3347 {
3348
3349         union   ccb *ccb;
3350         struct  sa_softc *softc;
3351         int error;
3352
3353         softc = (struct sa_softc *)periph->softc;
3354
3355         ccb = cam_periph_getccb(periph, 1);
3356
3357         scsi_erase(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG, FALSE, longerase,
3358             SSD_FULL_SIZE, ERASE_TIMEOUT);
3359
3360         softc->dsreg = MTIO_DSREG_ZER;
3361         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3362         softc->dsreg = MTIO_DSREG_REST;
3363
3364         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3365                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3366         xpt_release_ccb(ccb);
3367         return (error);
3368 }
3369
3370 #endif /* _KERNEL */
3371
3372 /*
3373  * Read tape block limits command.
3374  */
3375 void
3376 scsi_read_block_limits(struct ccb_scsiio *csio, u_int32_t retries,
3377                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3378                    u_int8_t tag_action,
3379                    struct scsi_read_block_limits_data *rlimit_buf,
3380                    u_int8_t sense_len, u_int32_t timeout)
3381 {
3382         struct scsi_read_block_limits *scsi_cmd;
3383
3384         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3385              (u_int8_t *)rlimit_buf, sizeof(*rlimit_buf), sense_len,
3386              sizeof(*scsi_cmd), timeout);
3387
3388         scsi_cmd = (struct scsi_read_block_limits *)&csio->cdb_io.cdb_bytes;
3389         bzero(scsi_cmd, sizeof(*scsi_cmd));
3390         scsi_cmd->opcode = READ_BLOCK_LIMITS;
3391 }
3392
3393 void
3394 scsi_sa_read_write(struct ccb_scsiio *csio, u_int32_t retries,
3395                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3396                    u_int8_t tag_action, int readop, int sli,
3397                    int fixed, u_int32_t length, u_int8_t *data_ptr,
3398                    u_int32_t dxfer_len, u_int8_t sense_len, u_int32_t timeout)
3399 {
3400         struct scsi_sa_rw *scsi_cmd;
3401
3402         scsi_cmd = (struct scsi_sa_rw *)&csio->cdb_io.cdb_bytes;
3403         scsi_cmd->opcode = readop ? SA_READ : SA_WRITE;
3404         scsi_cmd->sli_fixed = 0;
3405         if (sli && readop)
3406                 scsi_cmd->sli_fixed |= SAR_SLI;
3407         if (fixed)
3408                 scsi_cmd->sli_fixed |= SARW_FIXED;
3409         scsi_ulto3b(length, scsi_cmd->length);
3410         scsi_cmd->control = 0;
3411
3412         cam_fill_csio(csio, retries, cbfcnp, readop ? CAM_DIR_IN : CAM_DIR_OUT,
3413             tag_action, data_ptr, dxfer_len, sense_len,
3414             sizeof(*scsi_cmd), timeout);
3415 }
3416
3417 void
3418 scsi_load_unload(struct ccb_scsiio *csio, u_int32_t retries,
3419                  void (*cbfcnp)(struct cam_periph *, union ccb *),
3420                  u_int8_t tag_action, int immediate, int eot,
3421                  int reten, int load, u_int8_t sense_len,
3422                  u_int32_t timeout)
3423 {
3424         struct scsi_load_unload *scsi_cmd;
3425
3426         scsi_cmd = (struct scsi_load_unload *)&csio->cdb_io.cdb_bytes;
3427         bzero(scsi_cmd, sizeof(*scsi_cmd));
3428         scsi_cmd->opcode = LOAD_UNLOAD;
3429         if (immediate)
3430                 scsi_cmd->immediate = SLU_IMMED;
3431         if (eot)
3432                 scsi_cmd->eot_reten_load |= SLU_EOT;
3433         if (reten)
3434                 scsi_cmd->eot_reten_load |= SLU_RETEN;
3435         if (load)
3436                 scsi_cmd->eot_reten_load |= SLU_LOAD;
3437
3438         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3439             NULL, 0, sense_len, sizeof(*scsi_cmd), timeout);
3440 }
3441
3442 void
3443 scsi_rewind(struct ccb_scsiio *csio, u_int32_t retries,
3444             void (*cbfcnp)(struct cam_periph *, union ccb *),
3445             u_int8_t tag_action, int immediate, u_int8_t sense_len,
3446             u_int32_t timeout)
3447 {
3448         struct scsi_rewind *scsi_cmd;
3449
3450         scsi_cmd = (struct scsi_rewind *)&csio->cdb_io.cdb_bytes;
3451         bzero(scsi_cmd, sizeof(*scsi_cmd));
3452         scsi_cmd->opcode = REWIND;
3453         if (immediate)
3454                 scsi_cmd->immediate = SREW_IMMED;
3455
3456         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3457             0, sense_len, sizeof(*scsi_cmd), timeout);
3458 }
3459
3460 void
3461 scsi_space(struct ccb_scsiio *csio, u_int32_t retries,
3462            void (*cbfcnp)(struct cam_periph *, union ccb *),
3463            u_int8_t tag_action, scsi_space_code code,
3464            u_int32_t count, u_int8_t sense_len, u_int32_t timeout)
3465 {
3466         struct scsi_space *scsi_cmd;
3467
3468         scsi_cmd = (struct scsi_space *)&csio->cdb_io.cdb_bytes;
3469         scsi_cmd->opcode = SPACE;
3470         scsi_cmd->code = code;
3471         scsi_ulto3b(count, scsi_cmd->count);
3472         scsi_cmd->control = 0;
3473
3474         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3475             0, sense_len, sizeof(*scsi_cmd), timeout);
3476 }
3477
3478 void
3479 scsi_write_filemarks(struct ccb_scsiio *csio, u_int32_t retries,
3480                      void (*cbfcnp)(struct cam_periph *, union ccb *),
3481                      u_int8_t tag_action, int immediate, int setmark,
3482                      u_int32_t num_marks, u_int8_t sense_len,
3483                      u_int32_t timeout)
3484 {
3485         struct scsi_write_filemarks *scsi_cmd;
3486
3487         scsi_cmd = (struct scsi_write_filemarks *)&csio->cdb_io.cdb_bytes;
3488         bzero(scsi_cmd, sizeof(*scsi_cmd));
3489         scsi_cmd->opcode = WRITE_FILEMARKS;
3490         if (immediate)
3491                 scsi_cmd->byte2 |= SWFMRK_IMMED;
3492         if (setmark)
3493                 scsi_cmd->byte2 |= SWFMRK_WSMK;
3494
3495         scsi_ulto3b(num_marks, scsi_cmd->num_marks);
3496
3497         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3498             0, sense_len, sizeof(*scsi_cmd), timeout);
3499 }
3500
3501 /*
3502  * The reserve and release unit commands differ only by their opcodes.
3503  */
3504 void
3505 scsi_reserve_release_unit(struct ccb_scsiio *csio, u_int32_t retries,
3506                           void (*cbfcnp)(struct cam_periph *, union ccb *),
3507                           u_int8_t tag_action, int third_party,
3508                           int third_party_id, u_int8_t sense_len,
3509                           u_int32_t timeout, int reserve)
3510 {
3511         struct scsi_reserve_release_unit *scsi_cmd;
3512
3513         scsi_cmd = (struct scsi_reserve_release_unit *)&csio->cdb_io.cdb_bytes;
3514         bzero(scsi_cmd, sizeof(*scsi_cmd));
3515
3516         if (reserve)
3517                 scsi_cmd->opcode = RESERVE_UNIT;
3518         else
3519                 scsi_cmd->opcode = RELEASE_UNIT;
3520
3521         if (third_party) {
3522                 scsi_cmd->lun_thirdparty |= SRRU_3RD_PARTY;
3523                 scsi_cmd->lun_thirdparty |=
3524                         ((third_party_id << SRRU_3RD_SHAMT) & SRRU_3RD_MASK);
3525         }
3526
3527         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3528             0, sense_len, sizeof(*scsi_cmd), timeout);
3529 }
3530
3531 void
3532 scsi_erase(struct ccb_scsiio *csio, u_int32_t retries,
3533            void (*cbfcnp)(struct cam_periph *, union ccb *),
3534            u_int8_t tag_action, int immediate, int long_erase,
3535            u_int8_t sense_len, u_int32_t timeout)
3536 {
3537         struct scsi_erase *scsi_cmd;
3538
3539         scsi_cmd = (struct scsi_erase *)&csio->cdb_io.cdb_bytes;
3540         bzero(scsi_cmd, sizeof(*scsi_cmd));
3541
3542         scsi_cmd->opcode = ERASE;
3543
3544         if (immediate)
3545                 scsi_cmd->lun_imm_long |= SE_IMMED;
3546
3547         if (long_erase)
3548                 scsi_cmd->lun_imm_long |= SE_LONG;
3549
3550         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3551             0, sense_len, sizeof(*scsi_cmd), timeout);
3552 }
3553
3554 /*
3555  * Read Tape Position command.
3556  */
3557 void
3558 scsi_read_position(struct ccb_scsiio *csio, u_int32_t retries,
3559                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3560                    u_int8_t tag_action, int hardsoft,
3561                    struct scsi_tape_position_data *sbp,
3562                    u_int8_t sense_len, u_int32_t timeout)
3563 {
3564         struct scsi_tape_read_position *scmd;
3565
3566         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3567             (u_int8_t *)sbp, sizeof (*sbp), sense_len, sizeof(*scmd), timeout);
3568         scmd = (struct scsi_tape_read_position *)&csio->cdb_io.cdb_bytes;
3569         bzero(scmd, sizeof(*scmd));
3570         scmd->opcode = READ_POSITION;
3571         scmd->byte1 = hardsoft;
3572 }
3573
3574 /*
3575  * Set Tape Position command.
3576  */
3577 void
3578 scsi_set_position(struct ccb_scsiio *csio, u_int32_t retries,
3579                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3580                    u_int8_t tag_action, int hardsoft, u_int32_t blkno,
3581                    u_int8_t sense_len, u_int32_t timeout)
3582 {
3583         struct scsi_tape_locate *scmd;
3584
3585         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3586             (u_int8_t *)NULL, 0, sense_len, sizeof(*scmd), timeout);
3587         scmd = (struct scsi_tape_locate *)&csio->cdb_io.cdb_bytes;
3588         bzero(scmd, sizeof(*scmd));
3589         scmd->opcode = LOCATE;
3590         if (hardsoft)
3591                 scmd->byte1 |= SA_SPOS_BT;
3592         scsi_ulto4b(blkno, scmd->blkaddr);
3593 }