sys/cam/scsi/scsi_sa.c

   1 /*-
   2  * Implementation of SCSI Sequential Access Peripheral driver for CAM.
   3  *
   4  * Copyright (c) 1999, 2000 Matthew Jacob
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #ifdef _KERNEL
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #endif
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40 #include <sys/bio.h>
  41 #include <sys/limits.h>
  42 #include <sys/malloc.h>
  43 #include <sys/mtio.h>
  44 #ifdef _KERNEL
  45 #include <sys/conf.h>
  46 #endif
  47 #include <sys/fcntl.h>
  48 #include <sys/devicestat.h>
  49
  50 #ifndef _KERNEL
  51 #include <stdio.h>
  52 #include <string.h>
  53 #endif
  54
  55 #include <cam/cam.h>
  56 #include <cam/cam_ccb.h>
  57 #include <cam/cam_periph.h>
  58 #include <cam/cam_xpt_periph.h>
  59 #include <cam/cam_debug.h>
  60
  61 #include <cam/scsi/scsi_all.h>
  62 #include <cam/scsi/scsi_message.h>
  63 #include <cam/scsi/scsi_sa.h>
  64
  65 #ifdef _KERNEL
  66
  67 #include <opt_sa.h>
  68
  69 #ifndef SA_IO_TIMEOUT
  70 #define SA_IO_TIMEOUT           4
  71 #endif
  72 #ifndef SA_SPACE_TIMEOUT
  73 #define SA_SPACE_TIMEOUT        1 * 60
  74 #endif
  75 #ifndef SA_REWIND_TIMEOUT
  76 #define SA_REWIND_TIMEOUT       2 * 60
  77 #endif
  78 #ifndef SA_ERASE_TIMEOUT
  79 #define SA_ERASE_TIMEOUT        4 * 60
  80 #endif
  81
  82 #define SCSIOP_TIMEOUT          (60 * 1000)     /* not an option */
  83
  84 #define IO_TIMEOUT              (SA_IO_TIMEOUT * 60 * 1000)
  85 #define REWIND_TIMEOUT          (SA_REWIND_TIMEOUT * 60 * 1000)
  86 #define ERASE_TIMEOUT           (SA_ERASE_TIMEOUT * 60 * 1000)
  87 #define SPACE_TIMEOUT           (SA_SPACE_TIMEOUT * 60 * 1000)
  88
  89 /*
  90  * Additional options that can be set for config: SA_1FM_AT_EOT
  91  */
  92
  93 #ifndef UNUSED_PARAMETER
  94 #define UNUSED_PARAMETER(x)     x = x
  95 #endif
  96
  97 #define QFRLS(ccb)      \
  98         if (((ccb)->ccb_h.status & CAM_DEV_QFRZN) != 0) \
  99                 cam_release_devq((ccb)->ccb_h.path, 0, 0, 0, FALSE)
 100
 101 /*
 102  * Driver states
 103  */
 104
 105 MALLOC_DEFINE(M_SCSISA, "SCSI sa", "SCSI sequential access buffers");
 106
 107 typedef enum {
 108         SA_STATE_NORMAL, SA_STATE_ABNORMAL
 109 } sa_state;
 110
 111 #define ccb_pflags      ppriv_field0
 112 #define ccb_bp          ppriv_ptr1
 113
 114 #define SA_CCB_BUFFER_IO        0x0
 115 #define SA_CCB_WAITING          0x1
 116 #define SA_CCB_TYPEMASK         0x1
 117 #define SA_POSITION_UPDATED     0x2
 118
 119 #define Set_CCB_Type(x, type)                           \
 120         x->ccb_h.ccb_pflags &= ~SA_CCB_TYPEMASK;        \
 121         x->ccb_h.ccb_pflags |= type
 122
 123 #define CCB_Type(x)     (x->ccb_h.ccb_pflags & SA_CCB_TYPEMASK)
 124
 125
 126
 127 typedef enum {
 128         SA_FLAG_OPEN            = 0x0001,
 129         SA_FLAG_FIXED           = 0x0002,
 130         SA_FLAG_TAPE_LOCKED     = 0x0004,
 131         SA_FLAG_TAPE_MOUNTED    = 0x0008,
 132         SA_FLAG_TAPE_WP         = 0x0010,
 133         SA_FLAG_TAPE_WRITTEN    = 0x0020,
 134         SA_FLAG_EOM_PENDING     = 0x0040,
 135         SA_FLAG_EIO_PENDING     = 0x0080,
 136         SA_FLAG_EOF_PENDING     = 0x0100,
 137         SA_FLAG_ERR_PENDING     = (SA_FLAG_EOM_PENDING|SA_FLAG_EIO_PENDING|
 138                                    SA_FLAG_EOF_PENDING),
 139         SA_FLAG_INVALID         = 0x0200,
 140         SA_FLAG_COMP_ENABLED    = 0x0400,
 141         SA_FLAG_COMP_SUPP       = 0x0800,
 142         SA_FLAG_COMP_UNSUPP     = 0x1000,
 143         SA_FLAG_TAPE_FROZEN     = 0x2000
 144 } sa_flags;
 145
 146 typedef enum {
 147         SA_MODE_REWIND          = 0x00,
 148         SA_MODE_NOREWIND        = 0x01,
 149         SA_MODE_OFFLINE         = 0x02
 150 } sa_mode;
 151
 152 typedef enum {
 153         SA_PARAM_NONE           = 0x00,
 154         SA_PARAM_BLOCKSIZE      = 0x01,
 155         SA_PARAM_DENSITY        = 0x02,
 156         SA_PARAM_COMPRESSION    = 0x04,
 157         SA_PARAM_BUFF_MODE      = 0x08,
 158         SA_PARAM_NUMBLOCKS      = 0x10,
 159         SA_PARAM_WP             = 0x20,
 160         SA_PARAM_SPEED          = 0x40,
 161         SA_PARAM_ALL            = 0x7f
 162 } sa_params;
 163
 164 typedef enum {
 165         SA_QUIRK_NONE           = 0x00,
 166         SA_QUIRK_NOCOMP         = 0x01, /* Can't deal with compression at all */
 167         SA_QUIRK_FIXED          = 0x02, /* Force fixed mode */
 168         SA_QUIRK_VARIABLE       = 0x04, /* Force variable mode */
 169         SA_QUIRK_2FM            = 0x08, /* Needs Two File Marks at EOD */
 170         SA_QUIRK_1FM            = 0x10, /* No more than 1 File Mark at EOD */
 171         SA_QUIRK_NODREAD        = 0x20, /* Don't try and dummy read density */
 172         SA_QUIRK_NO_MODESEL     = 0x40, /* Don't do mode select at all */
 173         SA_QUIRK_NO_CPAGE       = 0x80  /* Don't use DEVICE COMPRESSION page */
 174 } sa_quirks;
 175
 176 #define SAMODE(z)       (dev2unit(z) & 0x3)
 177 #define SADENSITY(z)    ((dev2unit(z) >> 2) & 0x3)
 178 #define SA_IS_CTRL(z)   (dev2unit(z) & (1 << 4))
 179
 180 #define SA_NOT_CTLDEV   0
 181 #define SA_CTLDEV       1
 182
 183 #define SA_ATYPE_R      0
 184 #define SA_ATYPE_NR     1
 185 #define SA_ATYPE_ER     2
 186
 187 #define SAMINOR(ctl, mode, access) \
 188         ((ctl << 4) | (mode << 2) | (access & 0x3))
 189
 190 #define SA_NUM_MODES    4
 191 struct sa_devs {
 192         struct cdev *ctl_dev;
 193         struct sa_mode_devs {
 194                 struct cdev *r_dev;
 195                 struct cdev *nr_dev;
 196                 struct cdev *er_dev;
 197         } mode_devs[SA_NUM_MODES];
 198 };
 199
 200 struct sa_softc {
 201         sa_state        state;
 202         sa_flags        flags;
 203         sa_quirks       quirks;
 204         struct          bio_queue_head bio_queue;
 205         int             queue_count;
 206         struct          devstat *device_stats;
 207         struct sa_devs  devs;
 208         int             blk_gran;
 209         int             blk_mask;
 210         int             blk_shift;
 211         u_int32_t       max_blk;
 212         u_int32_t       min_blk;
 213         u_int32_t       comp_algorithm;
 214         u_int32_t       saved_comp_algorithm;
 215         u_int32_t       media_blksize;
 216         u_int32_t       last_media_blksize;
 217         u_int32_t       media_numblks;
 218         u_int8_t        media_density;
 219         u_int8_t        speed;
 220         u_int8_t        scsi_rev;
 221         u_int8_t        dsreg;          /* mtio mt_dsreg, redux */
 222         int             buffer_mode;
 223         int             filemarks;
 224         union           ccb saved_ccb;
 225         int             last_resid_was_io;
 226
 227         /*
 228          * Relative to BOT Location.
 229          */
 230         daddr_t         fileno;
 231         daddr_t         blkno;
 232
 233         /*
 234          * Latched Error Info
 235          */
 236         struct {
 237                 struct scsi_sense_data _last_io_sense;
 238                 u_int32_t _last_io_resid;
 239                 u_int8_t _last_io_cdb[CAM_MAX_CDBLEN];
 240                 struct scsi_sense_data _last_ctl_sense;
 241                 u_int32_t _last_ctl_resid;
 242                 u_int8_t _last_ctl_cdb[CAM_MAX_CDBLEN];
 243 #define last_io_sense   errinfo._last_io_sense
 244 #define last_io_resid   errinfo._last_io_resid
 245 #define last_io_cdb     errinfo._last_io_cdb
 246 #define last_ctl_sense  errinfo._last_ctl_sense
 247 #define last_ctl_resid  errinfo._last_ctl_resid
 248 #define last_ctl_cdb    errinfo._last_ctl_cdb
 249         } errinfo;
 250         /*
 251          * Misc other flags/state
 252          */
 253         u_int32_t
 254                                         : 29,
 255                 open_rdonly             : 1,    /* open read-only */
 256                 open_pending_mount      : 1,    /* open pending mount */
 257                 ctrl_mode               : 1;    /* control device open */
 258 };
 259
 260 struct sa_quirk_entry {
 261         struct scsi_inquiry_pattern inq_pat;    /* matching pattern */
 262         sa_quirks quirks;       /* specific quirk type */
 263         u_int32_t prefblk;      /* preferred blocksize when in fixed mode */
 264 };
 265
 266 static struct sa_quirk_entry sa_quirk_table[] =
 267 {
 268         {
 269                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "OnStream",
 270                   "ADR*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_NODREAD |
 271                    SA_QUIRK_1FM|SA_QUIRK_NO_MODESEL, 32768
 272         },
 273         {
 274                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 275                   "Python 06408*", "*"}, SA_QUIRK_NODREAD, 0
 276         },
 277         {
 278                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 279                   "Python 25601*", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_NODREAD, 0
 280         },
 281         {
 282                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 283                   "Python*", "*"}, SA_QUIRK_NODREAD, 0
 284         },
 285         {
 286                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 287                   "VIPER 150*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 288         },
 289         {
 290                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 291                   "VIPER 2525 25462", "-011"},
 292                   SA_QUIRK_NOCOMP|SA_QUIRK_1FM|SA_QUIRK_NODREAD, 0
 293         },
 294         {
 295                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 296                   "VIPER 2525*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 297         },
 298 #if     0
 299         {
 300                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 301                   "C15*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_NO_CPAGE, 0,
 302         },
 303 #endif
 304         {
 305                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 306                   "C56*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 307         },
 308         {
 309                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 310                   "T20*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 311         },
 312         {
 313                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 314                   "T4000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 315         },
 316         {
 317                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 318                   "HP-88780*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 319         },
 320         {
 321                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
 322                   "*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 323         },
 324         {
 325                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "M4 DATA",
 326                   "123107 SCSI*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 327         },
 328         {       /* jreynold@primenet.com */
 329                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 330                 "STT8000N*", "*"}, SA_QUIRK_1FM, 0
 331         },
 332         {       /* mike@sentex.net */
 333                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 334                 "STT20000*", "*"}, SA_QUIRK_1FM, 0
 335         },
 336         {
 337                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 338                   " TDC 3600", "U07:"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 339         },
 340         {
 341                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 342                   " TDC 3800", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 343         },
 344         {
 345                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 346                   " TDC 4100", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 347         },
 348         {
 349                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 350                   " TDC 4200", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 351         },
 352         {
 353                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 354                   " SLR*", "*"}, SA_QUIRK_1FM, 0
 355         },
 356         {
 357                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 358                   "5525ES*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 359         },
 360         {
 361                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 362                   "51000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 363         }
 364 };
 365
 366 static  d_open_t        saopen;
 367 static  d_close_t       saclose;
 368 static  d_strategy_t    sastrategy;
 369 static  d_ioctl_t       saioctl;
 370 static  periph_init_t   sainit;
 371 static  periph_ctor_t   saregister;
 372 static  periph_oninv_t  saoninvalidate;
 373 static  periph_dtor_t   sacleanup;
 374 static  periph_start_t  sastart;
 375 static  void            saasync(void *callback_arg, u_int32_t code,
 376                                 struct cam_path *path, void *arg);
 377 static  void            sadone(struct cam_periph *periph,
 378                                union ccb *start_ccb);
 379 static  int             saerror(union ccb *ccb, u_int32_t cam_flags,
 380                                 u_int32_t sense_flags);
 381 static int              samarkswanted(struct cam_periph *);
 382 static int              sacheckeod(struct cam_periph *periph);
 383 static int              sagetparams(struct cam_periph *periph,
 384                                     sa_params params_to_get,
 385                                     u_int32_t *blocksize, u_int8_t *density,
 386                                     u_int32_t *numblocks, int *buff_mode,
 387                                     u_int8_t *write_protect, u_int8_t *speed,
 388                                     int *comp_supported, int *comp_enabled,
 389                                     u_int32_t *comp_algorithm,
 390                                     sa_comp_t *comp_page);
 391 static int              sasetparams(struct cam_periph *periph,
 392                                     sa_params params_to_set,
 393                                     u_int32_t blocksize, u_int8_t density,
 394                                     u_int32_t comp_algorithm,
 395                                     u_int32_t sense_flags);
 396 static void             saprevent(struct cam_periph *periph, int action);
 397 static int              sarewind(struct cam_periph *periph);
 398 static int              saspace(struct cam_periph *periph, int count,
 399                                 scsi_space_code code);
 400 static int              samount(struct cam_periph *, int, struct cdev *);
 401 static int              saretension(struct cam_periph *periph);
 402 static int              sareservereleaseunit(struct cam_periph *periph,
 403                                              int reserve);
 404 static int              saloadunload(struct cam_periph *periph, int load);
 405 static int              saerase(struct cam_periph *periph, int longerase);
 406 static int              sawritefilemarks(struct cam_periph *periph,
 407                                          int nmarks, int setmarks);
 408 static int              sardpos(struct cam_periph *periph, int, u_int32_t *);
 409 static int              sasetpos(struct cam_periph *periph, int, u_int32_t *);
 410
 411
 412 static struct periph_driver sadriver =
 413 {
 414         sainit, "sa",
 415         TAILQ_HEAD_INITIALIZER(sadriver.units), /* generation */ 0
 416 };
 417
 418 PERIPHDRIVER_DECLARE(sa, sadriver);
 419
 420 /* For 2.2-stable support */
 421 #ifndef D_TAPE
 422 #define D_TAPE 0
 423 #endif
 424
 425
 426 static struct cdevsw sa_cdevsw = {
 427         .d_version =    D_VERSION,
 428         .d_open =       saopen,
 429         .d_close =      saclose,
 430         .d_read =       physread,
 431         .d_write =      physwrite,
 432         .d_ioctl =      saioctl,
 433         .d_strategy =   sastrategy,
 434         .d_name =       "sa",
 435         .d_flags =      D_TAPE | D_NEEDGIANT,
 436 };
 437
 438 static int
 439 saopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 440 {
 441         struct cam_periph *periph;
 442         struct sa_softc *softc;
 443         int error;
 444
 445         periph = (struct cam_periph *)dev->si_drv1;
 446         if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
 447                 return (ENXIO);
 448         }
 449
 450         cam_periph_lock(periph);
 451
 452         softc = (struct sa_softc *)periph->softc;
 453
 454         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 455             ("saopen(%s): softc=0x%x\n", devtoname(dev), softc->flags));
 456
 457         if (SA_IS_CTRL(dev)) {
 458                 softc->ctrl_mode = 1;
 459                 cam_periph_unlock(periph);
 460                 return (0);
 461         }
 462
 463         if ((error = cam_periph_hold(periph, PRIBIO|PCATCH)) != 0) {
 464                 cam_periph_unlock(periph);
 465                 cam_periph_release(periph);
 466                 return (error);
 467         }
 468
 469         if (softc->flags & SA_FLAG_OPEN) {
 470                 error = EBUSY;
 471         } else if (softc->flags & SA_FLAG_INVALID) {
 472                 error = ENXIO;
 473         } else {
 474                 /*
 475                  * Preserve whether this is a read_only open.
 476                  */
 477                 softc->open_rdonly = (flags & O_RDWR) == O_RDONLY;
 478
 479                 /*
 480                  * The function samount ensures media is loaded and ready.
 481                  * It also does a device RESERVE if the tape isn't yet mounted.
 482                  *
 483                  * If the mount fails and this was a non-blocking open,
 484                  * make this a 'open_pending_mount' action.
 485                  */
 486                 error = samount(periph, flags, dev);
 487                 if (error && (flags & O_NONBLOCK)) {
 488                         softc->flags |= SA_FLAG_OPEN;
 489                         softc->open_pending_mount = 1;
 490                         cam_periph_unhold(periph);
 491                         cam_periph_unlock(periph);
 492                         return (0);
 493                 }
 494         }
 495
 496         if (error) {
 497                 cam_periph_unhold(periph);
 498                 cam_periph_unlock(periph);
 499                 cam_periph_release(periph);
 500                 return (error);
 501         }
 502
 503         saprevent(periph, PR_PREVENT);
 504         softc->flags |= SA_FLAG_OPEN;
 505
 506         cam_periph_unhold(periph);
 507         cam_periph_unlock(periph);
 508         return (error);
 509 }
 510
 511 static int
 512 saclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 513 {
 514         struct  cam_periph *periph;
 515         struct  sa_softc *softc;
 516         int     mode, error, writing, tmp;
 517         int     closedbits = SA_FLAG_OPEN;
 518
 519         mode = SAMODE(dev);
 520         periph = (struct cam_periph *)dev->si_drv1;
 521         if (periph == NULL)
 522                 return (ENXIO);
 523
 524         cam_periph_lock(periph);
 525
 526         softc = (struct sa_softc *)periph->softc;
 527
 528         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 529             ("saclose(%s): softc=0x%x\n", devtoname(dev), softc->flags));
 530
 531
 532         softc->open_rdonly = 0;
 533         if (SA_IS_CTRL(dev)) {
 534                 softc->ctrl_mode = 0;
 535                 cam_periph_unlock(periph);
 536                 cam_periph_release(periph);
 537                 return (0);
 538         }
 539
 540         if (softc->open_pending_mount) {
 541                 softc->flags &= ~SA_FLAG_OPEN;
 542                 softc->open_pending_mount = 0;
 543                 cam_periph_unlock(periph);
 544                 cam_periph_release(periph);
 545                 return (0);
 546         }
 547
 548         if ((error = cam_periph_hold(periph, PRIBIO)) != 0) {
 549                 cam_periph_unlock(periph);
 550                 return (error);
 551         }
 552
 553         /*
 554          * Were we writing the tape?
 555          */
 556         writing = (softc->flags & SA_FLAG_TAPE_WRITTEN) != 0;
 557
 558         /*
 559          * See whether or not we need to write filemarks. If this
 560          * fails, we probably have to assume we've lost tape
 561          * position.
 562          */
 563         error = sacheckeod(periph);
 564         if (error) {
 565                 xpt_print(periph->path,
 566                     "failed to write terminating filemark(s)\n");
 567                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 568         }
 569
 570         /*
 571          * Whatever we end up doing, allow users to eject tapes from here on.
 572          */
 573         saprevent(periph, PR_ALLOW);
 574
 575         /*
 576          * Decide how to end...
 577          */
 578         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
 579                 closedbits |= SA_FLAG_TAPE_FROZEN;
 580         } else switch (mode) {
 581         case SA_MODE_OFFLINE:
 582                 /*
 583                  * An 'offline' close is an unconditional release of
 584                  * frozen && mount conditions, irrespective of whether
 585                  * these operations succeeded. The reason for this is
 586                  * to allow at least some kind of programmatic way
 587                  * around our state getting all fouled up. If somebody
 588                  * issues an 'offline' command, that will be allowed
 589                  * to clear state.
 590                  */
 591                 (void) sarewind(periph);
 592                 (void) saloadunload(periph, FALSE);
 593                 closedbits |= SA_FLAG_TAPE_MOUNTED|SA_FLAG_TAPE_FROZEN;
 594                 break;
 595         case SA_MODE_REWIND:
 596                 /*
 597                  * If the rewind fails, return an error- if anyone cares,
 598                  * but not overwriting any previous error.
 599                  *
 600                  * We don't clear the notion of mounted here, but we do
 601                  * clear the notion of frozen if we successfully rewound.
 602                  */
 603                 tmp = sarewind(periph);
 604                 if (tmp) {
 605                         if (error != 0)
 606                                 error = tmp;
 607                 } else {
 608                         closedbits |= SA_FLAG_TAPE_FROZEN;
 609                 }
 610                 break;
 611         case SA_MODE_NOREWIND:
 612                 /*
 613                  * If we're not rewinding/unloading the tape, find out
 614                  * whether we need to back up over one of two filemarks
 615                  * we wrote (if we wrote two filemarks) so that appends
 616                  * from this point on will be sane.
 617                  */
 618                 if (error == 0 && writing && (softc->quirks & SA_QUIRK_2FM)) {
 619                         tmp = saspace(periph, -1, SS_FILEMARKS);
 620                         if (tmp) {
 621                                 xpt_print(periph->path, "unable to backspace "
 622                                     "over one of double filemarks at end of "
 623                                     "tape\n");
 624                                 xpt_print(periph->path, "it is possible that "
 625                                     "this device needs a SA_QUIRK_1FM quirk set"
 626                                     "for it\n");
 627                                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 628                         }
 629                 }
 630                 break;
 631         default:
 632                 xpt_print(periph->path, "unknown mode 0x%x in saclose\n", mode);
 633                 /* NOTREACHED */
 634                 break;
 635         }
 636
 637         /*
 638          * We wish to note here that there are no more filemarks to be written.
 639          */
 640         softc->filemarks = 0;
 641         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
 642
 643         /*
 644          * And we are no longer open for business.
 645          */
 646         softc->flags &= ~closedbits;
 647
 648         /*
 649          * Inform users if tape state if frozen....
 650          */
 651         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 652                 xpt_print(periph->path, "tape is now frozen- use an OFFLINE, "
 653                     "REWIND or MTEOM command to clear this state.\n");
 654         }
 655
 656         /* release the device if it is no longer mounted */
 657         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0)
 658                 sareservereleaseunit(periph, FALSE);
 659
 660         cam_periph_unhold(periph);
 661         cam_periph_unlock(periph);
 662         cam_periph_release(periph);
 663
 664         return (error);
 665 }
 666
 667 /*
 668  * Actually translate the requested transfer into one the physical driver
 669  * can understand.  The transfer is described by a buf and will include
 670  * only one physical transfer.
 671  */
 672 static void
 673 sastrategy(struct bio *bp)
 674 {
 675         struct cam_periph *periph;
 676         struct sa_softc *softc;
 677
 678         bp->bio_resid = bp->bio_bcount;
 679         if (SA_IS_CTRL(bp->bio_dev)) {
 680                 biofinish(bp, NULL, EINVAL);
 681                 return;
 682         }
 683         periph = (struct cam_periph *)bp->bio_dev->si_drv1;
 684         if (periph == NULL) {
 685                 biofinish(bp, NULL, ENXIO);
 686                 return;
 687         }
 688         cam_periph_lock(periph);
 689
 690         softc = (struct sa_softc *)periph->softc;
 691
 692         if (softc->flags & SA_FLAG_INVALID) {
 693                 cam_periph_unlock(periph);
 694                 biofinish(bp, NULL, ENXIO);
 695                 return;
 696         }
 697
 698         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 699                 cam_periph_unlock(periph);
 700                 biofinish(bp, NULL, EPERM);
 701                 return;
 702         }
 703
 704         /*
 705          * This should actually never occur as the write(2)
 706          * system call traps attempts to write to a read-only
 707          * file descriptor.
 708          */
 709         if (bp->bio_cmd == BIO_WRITE && softc->open_rdonly) {
 710                 cam_periph_unlock(periph);
 711                 biofinish(bp, NULL, EBADF);
 712                 return;
 713         }
 714
 715         if (softc->open_pending_mount) {
 716                 int error = samount(periph, 0, bp->bio_dev);
 717                 if (error) {
 718                         cam_periph_unlock(periph);
 719                         biofinish(bp, NULL, ENXIO);
 720                         return;
 721                 }
 722                 saprevent(periph, PR_PREVENT);
 723                 softc->open_pending_mount = 0;
 724         }
 725
 726
 727         /*
 728          * If it's a null transfer, return immediately
 729          */
 730         if (bp->bio_bcount == 0) {
 731                 cam_periph_unlock(periph);
 732                 biodone(bp);
 733                 return;
 734         }
 735
 736         /* valid request?  */
 737         if (softc->flags & SA_FLAG_FIXED) {
 738                 /*
 739                  * Fixed block device.  The byte count must
 740                  * be a multiple of our block size.
 741                  */
 742                 if (((softc->blk_mask != ~0) &&
 743                     ((bp->bio_bcount & softc->blk_mask) != 0)) ||
 744                     ((softc->blk_mask == ~0) &&
 745                     ((bp->bio_bcount % softc->min_blk) != 0))) {
 746                         xpt_print(periph->path, "Invalid request.  Fixed block "
 747                             "device requests must be a multiple of %d bytes\n",
 748                             softc->min_blk);
 749                         cam_periph_unlock(periph);
 750                         biofinish(bp, NULL, EINVAL);
 751                         return;
 752                 }
 753         } else if ((bp->bio_bcount > softc->max_blk) ||
 754                    (bp->bio_bcount < softc->min_blk) ||
 755                    (bp->bio_bcount & softc->blk_mask) != 0) {
 756
 757                 xpt_print_path(periph->path);
 758                 printf("Invalid request.  Variable block "
 759                     "device requests must be ");
 760                 if (softc->blk_mask != 0) {
 761                         printf("a multiple of %d ", (0x1 << softc->blk_gran));
 762                 }
 763                 printf("between %d and %d bytes\n", softc->min_blk,
 764                     softc->max_blk);
 765                 cam_periph_unlock(periph);
 766                 biofinish(bp, NULL, EINVAL);
 767                 return;
 768         }
 769
 770         /*
 771          * Place it at the end of the queue.
 772          */
 773         bioq_insert_tail(&softc->bio_queue, bp);
 774         softc->queue_count++;
 775 #if     0
 776         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
 777             ("sastrategy: queuing a %ld %s byte %s\n", bp->bio_bcount,
 778             (softc->flags & SA_FLAG_FIXED)?  "fixed" : "variable",
 779             (bp->bio_cmd == BIO_READ)? "read" : "write"));
 780 #endif
 781         if (softc->queue_count > 1) {
 782                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
 783                     ("sastrategy: queue count now %d\n", softc->queue_count));
 784         }
 785
 786         /*
 787          * Schedule ourselves for performing the work.
 788          */
 789         xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 790         cam_periph_unlock(periph);
 791
 792         return;
 793 }
 794
 795
 796 #define PENDING_MOUNT_CHECK(softc, periph, dev)         \
 797         if (softc->open_pending_mount) {                \
 798                 error = samount(periph, 0, dev);        \
 799                 if (error) {                            \
 800                         break;                          \
 801                 }                                       \
 802                 saprevent(periph, PR_PREVENT);          \
 803                 softc->open_pending_mount = 0;          \
 804         }
 805
 806 static int
 807 saioctl(struct cdev *dev, u_long cmd, caddr_t arg, int flag, struct thread *td)
 808 {
 809         struct cam_periph *periph;
 810         struct sa_softc *softc;
 811         scsi_space_code spaceop;
 812         int didlockperiph = 0;
 813         int mode;
 814         int error = 0;
 815
 816         mode = SAMODE(dev);
 817         error = 0;              /* shut up gcc */
 818         spaceop = 0;            /* shut up gcc */
 819
 820         periph = (struct cam_periph *)dev->si_drv1;
 821         if (periph == NULL)
 822                 return (ENXIO);
 823
 824         cam_periph_lock(periph);
 825         softc = (struct sa_softc *)periph->softc;
 826
 827         /*
 828          * Check for control mode accesses. We allow MTIOCGET and
 829          * MTIOCERRSTAT (but need to be the only one open in order
 830          * to clear latched status), and MTSETBSIZE, MTSETDNSTY
 831          * and MTCOMP (but need to be the only one accessing this
 832          * device to run those).
 833          */
 834
 835         if (SA_IS_CTRL(dev)) {
 836                 switch (cmd) {
 837                 case MTIOCGETEOTMODEL:
 838                 case MTIOCGET:
 839                         break;
 840                 case MTIOCERRSTAT:
 841                         /*
 842                          * If the periph isn't already locked, lock it
 843                          * so our MTIOCERRSTAT can reset latched error stats.
 844                          *
 845                          * If the periph is already locked, skip it because
 846                          * we're just getting status and it'll be up to the
 847                          * other thread that has this device open to do
 848                          * an MTIOCERRSTAT that would clear latched status.
 849                          */
 850                         if ((periph->flags & CAM_PERIPH_LOCKED) == 0) {
 851                                 error = cam_periph_hold(periph, PRIBIO|PCATCH);
 852                                  if (error != 0)
 853                                         return (error);
 854                                 didlockperiph = 1;
 855                         }
 856                         break;
 857
 858                 case MTIOCTOP:
 859                 {
 860                         struct mtop *mt = (struct mtop *) arg;
 861
 862                         /*
 863                          * Check to make sure it's an OP we can perform
 864                          * with no media inserted.
 865                          */
 866                         switch (mt->mt_op) {
 867                         case MTSETBSIZ:
 868                         case MTSETDNSTY:
 869                         case MTCOMP:
 870                                 mt = NULL;
 871                                 /* FALLTHROUGH */
 872                         default:
 873                                 break;
 874                         }
 875                         if (mt != NULL) {
 876                                 break;
 877                         }
 878                         /* FALLTHROUGH */
 879                 }
 880                 case MTIOCSETEOTMODEL:
 881                         /*
 882                          * We need to acquire the peripheral here rather
 883                          * than at open time because we are sharing writable
 884                          * access to data structures.
 885                          */
 886                         error = cam_periph_hold(periph, PRIBIO|PCATCH);
 887                         if (error != 0)
 888                                 return (error);
 889                         didlockperiph = 1;
 890                         break;
 891
 892                 default:
 893                         return (EINVAL);
 894                 }
 895         }
 896
 897         /*
 898          * Find the device that the user is talking about
 899          */
 900         switch (cmd) {
 901         case MTIOCGET:
 902         {
 903                 struct mtget *g = (struct mtget *)arg;
 904
 905                 /*
 906                  * If this isn't the control mode device, actually go out
 907                  * and ask the drive again what it's set to.
 908                  */
 909                 if (!SA_IS_CTRL(dev) && !softc->open_pending_mount) {
 910                         u_int8_t write_protect;
 911                         int comp_enabled, comp_supported;
 912                         error = sagetparams(periph, SA_PARAM_ALL,
 913                             &softc->media_blksize, &softc->media_density,
 914                             &softc->media_numblks, &softc->buffer_mode,
 915                             &write_protect, &softc->speed, &comp_supported,
 916                             &comp_enabled, &softc->comp_algorithm, NULL);
 917                         if (error)
 918                                 break;
 919                         if (write_protect)
 920                                 softc->flags |= SA_FLAG_TAPE_WP;
 921                         else
 922                                 softc->flags &= ~SA_FLAG_TAPE_WP;
 923                         softc->flags &= ~(SA_FLAG_COMP_SUPP|
 924                             SA_FLAG_COMP_ENABLED|SA_FLAG_COMP_UNSUPP);
 925                         if (comp_supported) {
 926                                 if (softc->saved_comp_algorithm == 0)
 927                                         softc->saved_comp_algorithm =
 928                                             softc->comp_algorithm;
 929                                 softc->flags |= SA_FLAG_COMP_SUPP;
 930                                 if (comp_enabled)
 931                                         softc->flags |= SA_FLAG_COMP_ENABLED;
 932                         } else
 933                                 softc->flags |= SA_FLAG_COMP_UNSUPP;
 934                 }
 935                 bzero(g, sizeof(struct mtget));
 936                 g->mt_type = MT_ISAR;
 937                 if (softc->flags & SA_FLAG_COMP_UNSUPP) {
 938                         g->mt_comp = MT_COMP_UNSUPP;
 939                         g->mt_comp0 = MT_COMP_UNSUPP;
 940                         g->mt_comp1 = MT_COMP_UNSUPP;
 941                         g->mt_comp2 = MT_COMP_UNSUPP;
 942                         g->mt_comp3 = MT_COMP_UNSUPP;
 943                 } else {
 944                         if ((softc->flags & SA_FLAG_COMP_ENABLED) == 0) {
 945                                 g->mt_comp = MT_COMP_DISABLED;
 946                         } else {
 947                                 g->mt_comp = softc->comp_algorithm;
 948                         }
 949                         g->mt_comp0 = softc->comp_algorithm;
 950                         g->mt_comp1 = softc->comp_algorithm;
 951                         g->mt_comp2 = softc->comp_algorithm;
 952                         g->mt_comp3 = softc->comp_algorithm;
 953                 }
 954                 g->mt_density = softc->media_density;
 955                 g->mt_density0 = softc->media_density;
 956                 g->mt_density1 = softc->media_density;
 957                 g->mt_density2 = softc->media_density;
 958                 g->mt_density3 = softc->media_density;
 959                 g->mt_blksiz = softc->media_blksize;
 960                 g->mt_blksiz0 = softc->media_blksize;
 961                 g->mt_blksiz1 = softc->media_blksize;
 962                 g->mt_blksiz2 = softc->media_blksize;
 963                 g->mt_blksiz3 = softc->media_blksize;
 964                 g->mt_fileno = softc->fileno;
 965                 g->mt_blkno = softc->blkno;
 966                 g->mt_dsreg = (short) softc->dsreg;
 967                 /*
 968                  * Yes, we know that this is likely to overflow
 969                  */
 970                 if (softc->last_resid_was_io) {
 971                         if ((g->mt_resid = (short) softc->last_io_resid) != 0) {
 972                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
 973                                         softc->last_io_resid = 0;
 974                                 }
 975                         }
 976                 } else {
 977                         if ((g->mt_resid = (short)softc->last_ctl_resid) != 0) {
 978                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
 979                                         softc->last_ctl_resid = 0;
 980                                 }
 981                         }
 982                 }
 983                 error = 0;
 984                 break;
 985         }
 986         case MTIOCERRSTAT:
 987         {
 988                 struct scsi_tape_errors *sep =
 989                     &((union mterrstat *)arg)->scsi_errstat;
 990
 991                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
 992                     ("saioctl: MTIOCERRSTAT\n"));
 993
 994                 bzero(sep, sizeof(*sep));
 995                 sep->io_resid = softc->last_io_resid;
 996                 bcopy((caddr_t) &softc->last_io_sense, sep->io_sense,
 997                     sizeof (sep->io_sense));
 998                 bcopy((caddr_t) &softc->last_io_cdb, sep->io_cdb,
 999                     sizeof (sep->io_cdb));
1000                 sep->ctl_resid = softc->last_ctl_resid;
1001                 bcopy((caddr_t) &softc->last_ctl_sense, sep->ctl_sense,
1002                     sizeof (sep->ctl_sense));
1003                 bcopy((caddr_t) &softc->last_ctl_cdb, sep->ctl_cdb,
1004                     sizeof (sep->ctl_cdb));
1005
1006                 if ((SA_IS_CTRL(dev) == 0 && softc->open_pending_mount) ||
1007                     didlockperiph)
1008                         bzero((caddr_t) &softc->errinfo,
1009                             sizeof (softc->errinfo));
1010                 error = 0;
1011                 break;
1012         }
1013         case MTIOCTOP:
1014         {
1015                 struct mtop *mt;
1016                 int    count;
1017
1018                 PENDING_MOUNT_CHECK(softc, periph, dev);
1019
1020                 mt = (struct mtop *)arg;
1021
1022
1023                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
1024                          ("saioctl: op=0x%x count=0x%x\n",
1025                           mt->mt_op, mt->mt_count));
1026
1027                 count = mt->mt_count;
1028                 switch (mt->mt_op) {
1029                 case MTWEOF:    /* write an end-of-file marker */
1030                         /*
1031                          * We don't need to clear the SA_FLAG_TAPE_WRITTEN
1032                          * flag because by keeping track of filemarks
1033                          * we have last written we know ehether or not
1034                          * we need to write more when we close the device.
1035                          */
1036                         error = sawritefilemarks(periph, count, FALSE);
1037                         break;
1038                 case MTWSS:     /* write a setmark */
1039                         error = sawritefilemarks(periph, count, TRUE);
1040                         break;
1041                 case MTBSR:     /* backward space record */
1042                 case MTFSR:     /* forward space record */
1043                 case MTBSF:     /* backward space file */
1044                 case MTFSF:     /* forward space file */
1045                 case MTBSS:     /* backward space setmark */
1046                 case MTFSS:     /* forward space setmark */
1047                 case MTEOD:     /* space to end of recorded medium */
1048                 {
1049                         int nmarks;
1050
1051                         spaceop = SS_FILEMARKS;
1052                         nmarks = softc->filemarks;
1053                         error = sacheckeod(periph);
1054                         if (error) {
1055                                 xpt_print(periph->path,
1056                                     "EOD check prior to spacing failed\n");
1057                                 softc->flags |= SA_FLAG_EIO_PENDING;
1058                                 break;
1059                         }
1060                         nmarks -= softc->filemarks;
1061                         switch(mt->mt_op) {
1062                         case MTBSR:
1063                                 count = -count;
1064                                 /* FALLTHROUGH */
1065                         case MTFSR:
1066                                 spaceop = SS_BLOCKS;
1067                                 break;
1068                         case MTBSF:
1069                                 count = -count;
1070                                 /* FALLTHROUGH */
1071                         case MTFSF:
1072                                 break;
1073                         case MTBSS:
1074                                 count = -count;
1075                                 /* FALLTHROUGH */
1076                         case MTFSS:
1077                                 spaceop = SS_SETMARKS;
1078                                 break;
1079                         case MTEOD:
1080                                 spaceop = SS_EOD;
1081                                 count = 0;
1082                                 nmarks = 0;
1083                                 break;
1084                         default:
1085                                 error = EINVAL;
1086                                 break;
1087                         }
1088                         if (error)
1089                                 break;
1090
1091                         nmarks = softc->filemarks;
1092                         /*
1093                          * XXX: Why are we checking again?
1094                          */
1095                         error = sacheckeod(periph);
1096                         if (error)
1097                                 break;
1098                         nmarks -= softc->filemarks;
1099                         error = saspace(periph, count - nmarks, spaceop);
1100                         /*
1101                          * At this point, clear that we've written the tape
1102                          * and that we've written any filemarks. We really
1103                          * don't know what the applications wishes to do next-
1104                          * the sacheckeod's will make sure we terminated the
1105                          * tape correctly if we'd been writing, but the next
1106                          * action the user application takes will set again
1107                          * whether we need to write filemarks.
1108                          */
1109                         softc->flags &=
1110                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1111                         softc->filemarks = 0;
1112                         break;
1113                 }
1114                 case MTREW:     /* rewind */
1115                         PENDING_MOUNT_CHECK(softc, periph, dev);
1116                         (void) sacheckeod(periph);
1117                         error = sarewind(periph);
1118                         /* see above */
1119                         softc->flags &=
1120                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1121                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1122                         softc->filemarks = 0;
1123                         break;
1124                 case MTERASE:   /* erase */
1125                         PENDING_MOUNT_CHECK(softc, periph, dev);
1126                         error = saerase(periph, count);
1127                         softc->flags &=
1128                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1129                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1130                         break;
1131                 case MTRETENS:  /* re-tension tape */
1132                         PENDING_MOUNT_CHECK(softc, periph, dev);
1133                         error = saretension(periph);
1134                         softc->flags &=
1135                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1136                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1137                         break;
1138                 case MTOFFL:    /* rewind and put the drive offline */
1139
1140                         PENDING_MOUNT_CHECK(softc, periph, dev);
1141
1142                         (void) sacheckeod(periph);
1143                         /* see above */
1144                         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
1145                         softc->filemarks = 0;
1146
1147                         error = sarewind(periph);
1148                         /* clear the frozen flag anyway */
1149                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1150
1151                         /*
1152                          * Be sure to allow media removal before ejecting.
1153                          */
1154
1155                         saprevent(periph, PR_ALLOW);
1156                         if (error == 0) {
1157                                 error = saloadunload(periph, FALSE);
1158                                 if (error == 0) {
1159                                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1160                                 }
1161                         }
1162                         break;
1163
1164                 case MTNOP:     /* no operation, sets status only */
1165                 case MTCACHE:   /* enable controller cache */
1166                 case MTNOCACHE: /* disable controller cache */
1167                         error = 0;
1168                         break;
1169
1170                 case MTSETBSIZ: /* Set block size for device */
1171
1172                         PENDING_MOUNT_CHECK(softc, periph, dev);
1173
1174                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE, count,
1175                                             0, 0, 0);
1176                         if (error == 0) {
1177                                 softc->last_media_blksize =
1178                                     softc->media_blksize;
1179                                 softc->media_blksize = count;
1180                                 if (count) {
1181                                         softc->flags |= SA_FLAG_FIXED;
1182                                         if (powerof2(count)) {
1183                                                 softc->blk_shift =
1184                                                     ffs(count) - 1;
1185                                                 softc->blk_mask = count - 1;
1186                                         } else {
1187                                                 softc->blk_mask = ~0;
1188                                                 softc->blk_shift = 0;
1189                                         }
1190                                         /*
1191                                          * Make the user's desire 'persistent'.
1192                                          */
1193                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
1194                                         softc->quirks |= SA_QUIRK_FIXED;
1195                                 } else {
1196                                         softc->flags &= ~SA_FLAG_FIXED;
1197                                         if (softc->max_blk == 0) {
1198                                                 softc->max_blk = ~0;
1199                                         }
1200                                         softc->blk_shift = 0;
1201                                         if (softc->blk_gran != 0) {
1202                                                 softc->blk_mask =
1203                                                     softc->blk_gran - 1;
1204                                         } else {
1205                                                 softc->blk_mask = 0;
1206                                         }
1207                                         /*
1208                                          * Make the user's desire 'persistent'.
1209                                          */
1210                                         softc->quirks |= SA_QUIRK_VARIABLE;
1211                                         softc->quirks &= ~SA_QUIRK_FIXED;
1212                                 }
1213                         }
1214                         break;
1215                 case MTSETDNSTY:        /* Set density for device and mode */
1216                         PENDING_MOUNT_CHECK(softc, periph, dev);
1217
1218                         if (count > UCHAR_MAX) {
1219                                 error = EINVAL;
1220                                 break;
1221                         } else {
1222                                 error = sasetparams(periph, SA_PARAM_DENSITY,
1223                                                     0, count, 0, 0);
1224                         }
1225                         break;
1226                 case MTCOMP:    /* enable compression */
1227                         PENDING_MOUNT_CHECK(softc, periph, dev);
1228                         /*
1229                          * Some devices don't support compression, and
1230                          * don't like it if you ask them for the
1231                          * compression page.
1232                          */
1233                         if ((softc->quirks & SA_QUIRK_NOCOMP) ||
1234                             (softc->flags & SA_FLAG_COMP_UNSUPP)) {
1235                                 error = ENODEV;
1236                                 break;
1237                         }
1238                         error = sasetparams(periph, SA_PARAM_COMPRESSION,
1239                             0, 0, count, SF_NO_PRINT);
1240                         break;
1241                 default:
1242                         error = EINVAL;
1243                 }
1244                 break;
1245         }
1246         case MTIOCIEOT:
1247         case MTIOCEEOT:
1248                 error = 0;
1249                 break;
1250         case MTIOCRDSPOS:
1251                 PENDING_MOUNT_CHECK(softc, periph, dev);
1252                 error = sardpos(periph, 0, (u_int32_t *) arg);
1253                 break;
1254         case MTIOCRDHPOS:
1255                 PENDING_MOUNT_CHECK(softc, periph, dev);
1256                 error = sardpos(periph, 1, (u_int32_t *) arg);
1257                 break;
1258         case MTIOCSLOCATE:
1259                 PENDING_MOUNT_CHECK(softc, periph, dev);
1260                 error = sasetpos(periph, 0, (u_int32_t *) arg);
1261                 break;
1262         case MTIOCHLOCATE:
1263                 PENDING_MOUNT_CHECK(softc, periph, dev);
1264                 error = sasetpos(periph, 1, (u_int32_t *) arg);
1265                 break;
1266         case MTIOCGETEOTMODEL:
1267                 error = 0;
1268                 if (softc->quirks & SA_QUIRK_1FM)
1269                         mode = 1;
1270                 else
1271                         mode = 2;
1272                 *((u_int32_t *) arg) = mode;
1273                 break;
1274         case MTIOCSETEOTMODEL:
1275                 error = 0;
1276                 switch (*((u_int32_t *) arg)) {
1277                 case 1:
1278                         softc->quirks &= ~SA_QUIRK_2FM;
1279                         softc->quirks |= SA_QUIRK_1FM;
1280                         break;
1281                 case 2:
1282                         softc->quirks &= ~SA_QUIRK_1FM;
1283                         softc->quirks |= SA_QUIRK_2FM;
1284                         break;
1285                 default:
1286                         error = EINVAL;
1287                         break;
1288                 }
1289                 break;
1290         default:
1291                 error = cam_periph_ioctl(periph, cmd, arg, saerror);
1292                 break;
1293         }
1294
1295         /*
1296          * Check to see if we cleared a frozen state
1297          */
1298         if (error == 0 && (softc->flags & SA_FLAG_TAPE_FROZEN)) {
1299                 switch(cmd) {
1300                 case MTIOCRDSPOS:
1301                 case MTIOCRDHPOS:
1302                 case MTIOCSLOCATE:
1303                 case MTIOCHLOCATE:
1304                         softc->fileno = (daddr_t) -1;
1305                         softc->blkno = (daddr_t) -1;
1306                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1307                         xpt_print(periph->path,
1308                             "tape state now unfrozen.\n");
1309                         break;
1310                 default:
1311                         break;
1312                 }
1313         }
1314         if (didlockperiph) {
1315                 cam_periph_unhold(periph);
1316         }
1317         cam_periph_unlock(periph);
1318         return (error);
1319 }
1320
1321 static void
1322 sainit(void)
1323 {
1324         cam_status status;
1325
1326         /*
1327          * Install a global async callback.
1328          */
1329         status = xpt_register_async(AC_FOUND_DEVICE, saasync, NULL, NULL);
1330
1331         if (status != CAM_REQ_CMP) {
1332                 printf("sa: Failed to attach master async callback "
1333                        "due to status 0x%x!\n", status);
1334         }
1335 }
1336
1337 static void
1338 saoninvalidate(struct cam_periph *periph)
1339 {
1340         struct sa_softc *softc;
1341
1342         softc = (struct sa_softc *)periph->softc;
1343
1344         /*
1345          * De-register any async callbacks.
1346          */
1347         xpt_register_async(0, saasync, periph, periph->path);
1348
1349         softc->flags |= SA_FLAG_INVALID;
1350
1351         /*
1352          * Return all queued I/O with ENXIO.
1353          * XXX Handle any transactions queued to the card
1354          *     with XPT_ABORT_CCB.
1355          */
1356         bioq_flush(&softc->bio_queue, NULL, ENXIO);
1357         softc->queue_count = 0;
1358
1359         xpt_print(periph->path, "lost device\n");
1360
1361 }
1362
1363 static void
1364 sacleanup(struct cam_periph *periph)
1365 {
1366         struct sa_softc *softc;
1367         int i;
1368
1369         softc = (struct sa_softc *)periph->softc;
1370
1371         xpt_print(periph->path, "removing device entry\n");
1372         devstat_remove_entry(softc->device_stats);
1373         cam_periph_unlock(periph);
1374         destroy_dev(softc->devs.ctl_dev);
1375         for (i = 0; i < SA_NUM_MODES; i++) {
1376                 destroy_dev(softc->devs.mode_devs[i].r_dev);
1377                 destroy_dev(softc->devs.mode_devs[i].nr_dev);
1378                 destroy_dev(softc->devs.mode_devs[i].er_dev);
1379         }
1380         cam_periph_lock(periph);
1381         free(softc, M_SCSISA);
1382 }
1383
1384 static void
1385 saasync(void *callback_arg, u_int32_t code,
1386         struct cam_path *path, void *arg)
1387 {
1388         struct cam_periph *periph;
1389
1390         periph = (struct cam_periph *)callback_arg;
1391         switch (code) {
1392         case AC_FOUND_DEVICE:
1393         {
1394                 struct ccb_getdev *cgd;
1395                 cam_status status;
1396
1397                 cgd = (struct ccb_getdev *)arg;
1398                 if (cgd == NULL)
1399                         break;
1400
1401                 if (cgd->protocol != PROTO_SCSI)
1402                         break;
1403
1404                 if (SID_TYPE(&cgd->inq_data) != T_SEQUENTIAL)
1405                         break;
1406
1407                 /*
1408                  * Allocate a peripheral instance for
1409                  * this device and start the probe
1410                  * process.
1411                  */
1412                 status = cam_periph_alloc(saregister, saoninvalidate,
1413                                           sacleanup, sastart,
1414                                           "sa", CAM_PERIPH_BIO, cgd->ccb_h.path,
1415                                           saasync, AC_FOUND_DEVICE, cgd);
1416
1417                 if (status != CAM_REQ_CMP
1418                  && status != CAM_REQ_INPROG)
1419                         printf("saasync: Unable to probe new device "
1420                                 "due to status 0x%x\n", status);
1421                 break;
1422         }
1423         default:
1424                 cam_periph_async(periph, code, path, arg);
1425                 break;
1426         }
1427 }
1428
1429 static cam_status
1430 saregister(struct cam_periph *periph, void *arg)
1431 {
1432         struct sa_softc *softc;
1433         struct ccb_getdev *cgd;
1434         caddr_t match;
1435         int i;
1436
1437         cgd = (struct ccb_getdev *)arg;
1438         if (periph == NULL) {
1439                 printf("saregister: periph was NULL!!\n");
1440                 return (CAM_REQ_CMP_ERR);
1441         }
1442
1443         if (cgd == NULL) {
1444                 printf("saregister: no getdev CCB, can't register device\n");
1445                 return (CAM_REQ_CMP_ERR);
1446         }
1447
1448         softc = (struct sa_softc *)
1449             malloc(sizeof (*softc), M_SCSISA, M_NOWAIT | M_ZERO);
1450         if (softc == NULL) {
1451                 printf("saregister: Unable to probe new device. "
1452                        "Unable to allocate softc\n");
1453                 return (CAM_REQ_CMP_ERR);
1454         }
1455         softc->scsi_rev = SID_ANSI_REV(&cgd->inq_data);
1456         softc->state = SA_STATE_NORMAL;
1457         softc->fileno = (daddr_t) -1;
1458         softc->blkno = (daddr_t) -1;
1459
1460         bioq_init(&softc->bio_queue);
1461         periph->softc = softc;
1462
1463         /*
1464          * See if this device has any quirks.
1465          */
1466         match = cam_quirkmatch((caddr_t)&cgd->inq_data,
1467                                (caddr_t)sa_quirk_table,
1468                                sizeof(sa_quirk_table)/sizeof(*sa_quirk_table),
1469                                sizeof(*sa_quirk_table), scsi_inquiry_match);
1470
1471         if (match != NULL) {
1472                 softc->quirks = ((struct sa_quirk_entry *)match)->quirks;
1473                 softc->last_media_blksize =
1474                     ((struct sa_quirk_entry *)match)->prefblk;
1475 #ifdef  CAMDEBUG
1476                 xpt_print(periph->path, "found quirk entry %d\n",
1477                     (int) (((struct sa_quirk_entry *) match) - sa_quirk_table));
1478 #endif
1479         } else
1480                 softc->quirks = SA_QUIRK_NONE;
1481
1482         /*
1483          * The SA driver supports a blocksize, but we don't know the
1484          * blocksize until we media is inserted.  So, set a flag to
1485          * indicate that the blocksize is unavailable right now.
1486          */
1487         cam_periph_unlock(periph);
1488         softc->device_stats = devstat_new_entry("sa", periph->unit_number, 0,
1489             DEVSTAT_BS_UNAVAILABLE, SID_TYPE(&cgd->inq_data) |
1490             DEVSTAT_TYPE_IF_SCSI, DEVSTAT_PRIORITY_TAPE);
1491
1492         softc->devs.ctl_dev = make_dev(&sa_cdevsw, SAMINOR(SA_CTLDEV,
1493             0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1494             0660, "%s%d.ctl", periph->periph_name, periph->unit_number);
1495         softc->devs.ctl_dev->si_drv1 = periph;
1496
1497         for (i = 0; i < SA_NUM_MODES; i++) {
1498
1499                 softc->devs.mode_devs[i].r_dev = make_dev(&sa_cdevsw,
1500                     SAMINOR(SA_NOT_CTLDEV, i, SA_ATYPE_R),
1501                     UID_ROOT, GID_OPERATOR, 0660, "%s%d.%d",
1502                     periph->periph_name, periph->unit_number, i);
1503                 softc->devs.mode_devs[i].r_dev->si_drv1 = periph;
1504
1505                 softc->devs.mode_devs[i].nr_dev = make_dev(&sa_cdevsw,
1506                     SAMINOR(SA_NOT_CTLDEV, i, SA_ATYPE_NR),
1507                     UID_ROOT, GID_OPERATOR, 0660, "n%s%d.%d",
1508                     periph->periph_name, periph->unit_number, i);
1509                 softc->devs.mode_devs[i].nr_dev->si_drv1 = periph;
1510
1511                 softc->devs.mode_devs[i].er_dev = make_dev(&sa_cdevsw,
1512                     SAMINOR(SA_NOT_CTLDEV, i, SA_ATYPE_ER),
1513                     UID_ROOT, GID_OPERATOR, 0660, "e%s%d.%d",
1514                     periph->periph_name, periph->unit_number, i);
1515                 softc->devs.mode_devs[i].er_dev->si_drv1 = periph;
1516
1517                 /*
1518                  * Make the (well known) aliases for the first mode.
1519                  */
1520                 if (i == 0) {
1521                         struct cdev *alias;
1522
1523                         alias = make_dev_alias(softc->devs.mode_devs[i].r_dev,
1524                            "%s%d", periph->periph_name, periph->unit_number);
1525                         alias->si_drv1 = periph;
1526                         alias = make_dev_alias(softc->devs.mode_devs[i].nr_dev,
1527                             "n%s%d", periph->periph_name, periph->unit_number);
1528                         alias->si_drv1 = periph;
1529                         alias = make_dev_alias(softc->devs.mode_devs[i].er_dev,
1530                             "e%s%d", periph->periph_name, periph->unit_number);
1531                         alias->si_drv1 = periph;
1532                 }
1533         }
1534         cam_periph_lock(periph);
1535
1536         /*
1537          * Add an async callback so that we get
1538          * notified if this device goes away.
1539          */
1540         xpt_register_async(AC_LOST_DEVICE, saasync, periph, periph->path);
1541
1542         xpt_announce_periph(periph, NULL);
1543
1544         return (CAM_REQ_CMP);
1545 }
1546
1547 static void
1548 sastart(struct cam_periph *periph, union ccb *start_ccb)
1549 {
1550         struct sa_softc *softc;
1551
1552         softc = (struct sa_softc *)periph->softc;
1553
1554         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("sastart\n"));
1555
1556
1557         switch (softc->state) {
1558         case SA_STATE_NORMAL:
1559         {
1560                 /* Pull a buffer from the queue and get going on it */
1561                 struct bio *bp;
1562
1563                 /*
1564                  * See if there is a buf with work for us to do..
1565                  */
1566                 bp = bioq_first(&softc->bio_queue);
1567                 if (periph->immediate_priority <= periph->pinfo.priority) {
1568                         CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
1569                                         ("queuing for immediate ccb\n"));
1570                         Set_CCB_Type(start_ccb, SA_CCB_WAITING);
1571                         SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
1572                                           periph_links.sle);
1573                         periph->immediate_priority = CAM_PRIORITY_NONE;
1574                         wakeup(&periph->ccb_list);
1575                 } else if (bp == NULL) {
1576                         xpt_release_ccb(start_ccb);
1577                 } else if ((softc->flags & SA_FLAG_ERR_PENDING) != 0) {
1578                         struct bio *done_bp;
1579 again:
1580                         softc->queue_count--;
1581                         bioq_remove(&softc->bio_queue, bp);
1582                         bp->bio_resid = bp->bio_bcount;
1583                         done_bp = bp;
1584                         if ((softc->flags & SA_FLAG_EOM_PENDING) != 0) {
1585                                 /*
1586                                  * We now just clear errors in this case
1587                                  * and let the residual be the notifier.
1588                                  */
1589                                 bp->bio_error = 0;
1590                         } else if ((softc->flags & SA_FLAG_EOF_PENDING) != 0) {
1591                                 /*
1592                                  * This can only happen if we're reading
1593                                  * in fixed length mode. In this case,
1594                                  * we dump the rest of the list the
1595                                  * same way.
1596                                  */
1597                                 bp->bio_error = 0;
1598                                 if (bioq_first(&softc->bio_queue) != NULL) {
1599                                         biodone(done_bp);
1600                                         goto again;
1601                                 }
1602                         } else if ((softc->flags & SA_FLAG_EIO_PENDING) != 0) {
1603                                 bp->bio_error = EIO;
1604                                 bp->bio_flags |= BIO_ERROR;
1605                         }
1606                         bp = bioq_first(&softc->bio_queue);
1607                         /*
1608                          * Only if we have no other buffers queued up
1609                          * do we clear the pending error flag.
1610                          */
1611                         if (bp == NULL)
1612                                 softc->flags &= ~SA_FLAG_ERR_PENDING;
1613                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1614                             ("sastart- ERR_PENDING now 0x%x, bp is %sNULL, "
1615                             "%d more buffers queued up\n",
1616                             (softc->flags & SA_FLAG_ERR_PENDING),
1617                             (bp != NULL)? "not " : " ", softc->queue_count));
1618                         xpt_release_ccb(start_ccb);
1619                         biodone(done_bp);
1620                 } else {
1621                         u_int32_t length;
1622
1623                         bioq_remove(&softc->bio_queue, bp);
1624                         softc->queue_count--;
1625
1626                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
1627                                 if (softc->blk_shift != 0) {
1628                                         length =
1629                                             bp->bio_bcount >> softc->blk_shift;
1630                                 } else if (softc->media_blksize != 0) {
1631                                         length = bp->bio_bcount /
1632                                             softc->media_blksize;
1633                                 } else {
1634                                         bp->bio_error = EIO;
1635                                         xpt_print(periph->path, "zero blocksize"
1636                                             " for FIXED length writes?\n");
1637                                         biodone(bp);
1638                                         break;
1639                                 }
1640 #if     0
1641                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1642                                     ("issuing a %d fixed record %s\n",
1643                                     length,  (bp->bio_cmd == BIO_READ)? "read" :
1644                                     "write"));
1645 #endif
1646                         } else {
1647                                 length = bp->bio_bcount;
1648 #if     0
1649                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1650                                     ("issuing a %d variable byte %s\n",
1651                                     length,  (bp->bio_cmd == BIO_READ)? "read" :
1652                                     "write"));
1653 #endif
1654                         }
1655                         devstat_start_transaction_bio(softc->device_stats, bp);
1656                         /*
1657                          * Some people have theorized that we should
1658                          * suppress illegal length indication if we are
1659                          * running in variable block mode so that we don't
1660                          * have to request sense every time our requested
1661                          * block size is larger than the written block.
1662                          * The residual information from the ccb allows
1663                          * us to identify this situation anyway.  The only
1664                          * problem with this is that we will not get
1665                          * information about blocks that are larger than
1666                          * our read buffer unless we set the block size
1667                          * in the mode page to something other than 0.
1668                          *
1669                          * I believe that this is a non-issue. If user apps
1670                          * don't adjust their read size to match our record
1671                          * size, that's just life. Anyway, the typical usage
1672                          * would be to issue, e.g., 64KB reads and occasionally
1673                          * have to do deal with 512 byte or 1KB intermediate
1674                          * records.
1675                          */
1676                         softc->dsreg = (bp->bio_cmd == BIO_READ)?
1677                             MTIO_DSREG_RD : MTIO_DSREG_WR;
1678                         scsi_sa_read_write(&start_ccb->csio, 0, sadone,
1679                             MSG_SIMPLE_Q_TAG, (bp->bio_cmd == BIO_READ),
1680                             FALSE, (softc->flags & SA_FLAG_FIXED) != 0,
1681                             length, bp->bio_data, bp->bio_bcount, SSD_FULL_SIZE,
1682                             IO_TIMEOUT);
1683                         start_ccb->ccb_h.ccb_pflags &= ~SA_POSITION_UPDATED;
1684                         Set_CCB_Type(start_ccb, SA_CCB_BUFFER_IO);
1685                         start_ccb->ccb_h.ccb_bp = bp;
1686                         bp = bioq_first(&softc->bio_queue);
1687                         xpt_action(start_ccb);
1688                 }
1689
1690                 if (bp != NULL) {
1691                         /* Have more work to do, so ensure we stay scheduled */
1692                         xpt_schedule(periph, CAM_PRIORITY_NORMAL);
1693                 }
1694                 break;
1695         }
1696         case SA_STATE_ABNORMAL:
1697         default:
1698                 panic("state 0x%x in sastart", softc->state);
1699                 break;
1700         }
1701 }
1702
1703
1704 static void
1705 sadone(struct cam_periph *periph, union ccb *done_ccb)
1706 {
1707         struct sa_softc *softc;
1708         struct ccb_scsiio *csio;
1709
1710         softc = (struct sa_softc *)periph->softc;
1711         csio = &done_ccb->csio;
1712         switch (CCB_Type(csio)) {
1713         case SA_CCB_BUFFER_IO:
1714         {
1715                 struct bio *bp;
1716                 int error;
1717
1718                 softc->dsreg = MTIO_DSREG_REST;
1719                 bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
1720                 error = 0;
1721                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1722                         if ((error = saerror(done_ccb, 0, 0)) == ERESTART) {
1723                                 /*
1724                                  * A retry was scheduled, so just return.
1725                                  */
1726                                 return;
1727                         }
1728                 }
1729
1730                 if (error == EIO) {
1731
1732                         /*
1733                          * Catastrophic error. Mark the tape as frozen
1734                          * (we no longer know tape position).
1735                          *
1736                          * Return all queued I/O with EIO, and unfreeze
1737                          * our queue so that future transactions that
1738                          * attempt to fix this problem can get to the
1739                          * device.
1740                          *
1741                          */
1742
1743                         softc->flags |= SA_FLAG_TAPE_FROZEN;
1744                         bioq_flush(&softc->bio_queue, NULL, EIO);
1745                 }
1746                 if (error != 0) {
1747                         bp->bio_resid = bp->bio_bcount;
1748                         bp->bio_error = error;
1749                         bp->bio_flags |= BIO_ERROR;
1750                         /*
1751                          * In the error case, position is updated in saerror.
1752                          */
1753                 } else {
1754                         bp->bio_resid = csio->resid;
1755                         bp->bio_error = 0;
1756                         if (csio->resid != 0) {
1757                                 bp->bio_flags |= BIO_ERROR;
1758                         }
1759                         if (bp->bio_cmd == BIO_WRITE) {
1760                                 softc->flags |= SA_FLAG_TAPE_WRITTEN;
1761                                 softc->filemarks = 0;
1762                         }
1763                         if (!(csio->ccb_h.ccb_pflags & SA_POSITION_UPDATED) &&
1764                             (softc->blkno != (daddr_t) -1)) {
1765                                 if ((softc->flags & SA_FLAG_FIXED) != 0) {
1766                                         u_int32_t l;
1767                                         if (softc->blk_shift != 0) {
1768                                                 l = bp->bio_bcount >>
1769                                                         softc->blk_shift;
1770                                         } else {
1771                                                 l = bp->bio_bcount /
1772                                                         softc->media_blksize;
1773                                         }
1774                                         softc->blkno += (daddr_t) l;
1775                                 } else {
1776                                         softc->blkno++;
1777                                 }
1778                         }
1779                 }
1780                 /*
1781                  * If we had an error (immediate or pending),
1782                  * release the device queue now.
1783                  */
1784                 if (error || (softc->flags & SA_FLAG_ERR_PENDING))
1785                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1786 #ifdef  CAMDEBUG
1787                 if (error || bp->bio_resid) {
1788                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1789                                   ("error %d resid %ld count %ld\n", error,
1790                                   bp->bio_resid, bp->bio_bcount));
1791                 }
1792 #endif
1793                 biofinish(bp, softc->device_stats, 0);
1794                 break;
1795         }
1796         case SA_CCB_WAITING:
1797         {
1798                 /* Caller will release the CCB */
1799                 wakeup(&done_ccb->ccb_h.cbfcnp);
1800                 return;
1801         }
1802         }
1803         xpt_release_ccb(done_ccb);
1804 }
1805
1806 /*
1807  * Mount the tape (make sure it's ready for I/O).
1808  */
1809 static int
1810 samount(struct cam_periph *periph, int oflags, struct cdev *dev)
1811 {
1812         struct  sa_softc *softc;
1813         union   ccb *ccb;
1814         int     error;
1815
1816         /*
1817          * oflags can be checked for 'kind' of open (read-only check) - later
1818          * dev can be checked for a control-mode or compression open - later
1819          */
1820         UNUSED_PARAMETER(oflags);
1821         UNUSED_PARAMETER(dev);
1822
1823
1824         softc = (struct sa_softc *)periph->softc;
1825
1826         /*
1827          * This should determine if something has happend since the last
1828          * open/mount that would invalidate the mount. We do *not* want
1829          * to retry this command- we just want the status. But we only
1830          * do this if we're mounted already- if we're not mounted,
1831          * we don't care about the unit read state and can instead use
1832          * this opportunity to attempt to reserve the tape unit.
1833          */
1834
1835         if (softc->flags & SA_FLAG_TAPE_MOUNTED) {
1836                 ccb = cam_periph_getccb(periph, 1);
1837                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1838                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1839                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1840                     softc->device_stats);
1841                 QFRLS(ccb);
1842                 if (error == ENXIO) {
1843                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1844                         scsi_test_unit_ready(&ccb->csio, 0, sadone,
1845                             MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1846                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1847                             softc->device_stats);
1848                         QFRLS(ccb);
1849                 } else if (error) {
1850                         /*
1851                          * We don't need to freeze the tape because we
1852                          * will now attempt to rewind/load it.
1853                          */
1854                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1855                         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
1856                                 xpt_print(periph->path,
1857                                     "error %d on TUR in samount\n", error);
1858                         }
1859                 }
1860         } else {
1861                 error = sareservereleaseunit(periph, TRUE);
1862                 if (error) {
1863                         return (error);
1864                 }
1865                 ccb = cam_periph_getccb(periph, 1);
1866                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1867                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1868                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1869                     softc->device_stats);
1870                 QFRLS(ccb);
1871         }
1872
1873         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
1874                 struct scsi_read_block_limits_data *rblim = NULL;
1875                 int comp_enabled, comp_supported;
1876                 u_int8_t write_protect, guessing = 0;
1877
1878                 /*
1879                  * Clear out old state.
1880                  */
1881                 softc->flags &= ~(SA_FLAG_TAPE_WP|SA_FLAG_TAPE_WRITTEN|
1882                                   SA_FLAG_ERR_PENDING|SA_FLAG_COMP_ENABLED|
1883                                   SA_FLAG_COMP_SUPP|SA_FLAG_COMP_UNSUPP);
1884                 softc->filemarks = 0;
1885
1886                 /*
1887                  * *Very* first off, make sure we're loaded to BOT.
1888                  */
1889                 scsi_load_unload(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
1890                     FALSE, FALSE, 1, SSD_FULL_SIZE, REWIND_TIMEOUT);
1891                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1892                     softc->device_stats);
1893                 QFRLS(ccb);
1894
1895                 /*
1896                  * In case this doesn't work, do a REWIND instead
1897                  */
1898                 if (error) {
1899                         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
1900                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1901                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1902                                 softc->device_stats);
1903                         QFRLS(ccb);
1904                 }
1905                 if (error) {
1906                         xpt_release_ccb(ccb);
1907                         goto exit;
1908                 }
1909
1910                 /*
1911                  * Do a dummy test read to force access to the
1912                  * media so that the drive will really know what's
1913                  * there. We actually don't really care what the
1914                  * blocksize on tape is and don't expect to really
1915                  * read a full record.
1916                  */
1917                 rblim = (struct  scsi_read_block_limits_data *)
1918                     malloc(8192, M_SCSISA, M_NOWAIT);
1919                 if (rblim == NULL) {
1920                         xpt_print(periph->path, "no memory for test read\n");
1921                         xpt_release_ccb(ccb);
1922                         error = ENOMEM;
1923                         goto exit;
1924                 }
1925
1926                 if ((softc->quirks & SA_QUIRK_NODREAD) == 0) {
1927                         scsi_sa_read_write(&ccb->csio, 0, sadone,
1928                             MSG_SIMPLE_Q_TAG, 1, FALSE, 0, 8192,
1929                             (void *) rblim, 8192, SSD_FULL_SIZE,
1930                             IO_TIMEOUT);
1931                         (void) cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1932                             softc->device_stats);
1933                         QFRLS(ccb);
1934                         scsi_rewind(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
1935                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1936                         error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
1937                             SF_NO_PRINT | SF_RETRY_UA,
1938                             softc->device_stats);
1939                         QFRLS(ccb);
1940                         if (error) {
1941                                 xpt_print(periph->path,
1942                                     "unable to rewind after test read\n");
1943                                 xpt_release_ccb(ccb);
1944                                 goto exit;
1945                         }
1946                 }
1947
1948                 /*
1949                  * Next off, determine block limits.
1950                  */
1951                 scsi_read_block_limits(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
1952                     rblim, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
1953
1954                 error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
1955                     SF_NO_PRINT | SF_RETRY_UA, softc->device_stats);
1956
1957                 QFRLS(ccb);
1958                 xpt_release_ccb(ccb);
1959
1960                 if (error != 0) {
1961                         /*
1962                          * If it's less than SCSI-2, READ BLOCK LIMITS is not
1963                          * a MANDATORY command. Anyway- it doesn't matter-
1964                          * we can proceed anyway.
1965                          */
1966                         softc->blk_gran = 0;
1967                         softc->max_blk = ~0;
1968                         softc->min_blk = 0;
1969                 } else {
1970                         if (softc->scsi_rev >= SCSI_REV_SPC) {
1971                                 softc->blk_gran = RBL_GRAN(rblim);
1972                         } else {
1973                                 softc->blk_gran = 0;
1974                         }
1975                         /*
1976                          * We take max_blk == min_blk to mean a default to
1977                          * fixed mode- but note that whatever we get out of
1978                          * sagetparams below will actually determine whether
1979                          * we are actually *in* fixed mode.
1980                          */
1981                         softc->max_blk = scsi_3btoul(rblim->maximum);
1982                         softc->min_blk = scsi_2btoul(rblim->minimum);
1983
1984
1985                 }
1986                 /*
1987                  * Next, perform a mode sense to determine
1988                  * current density, blocksize, compression etc.
1989                  */
1990                 error = sagetparams(periph, SA_PARAM_ALL,
1991                                     &softc->media_blksize,
1992                                     &softc->media_density,
1993                                     &softc->media_numblks,
1994                                     &softc->buffer_mode, &write_protect,
1995                                     &softc->speed, &comp_supported,
1996                                     &comp_enabled, &softc->comp_algorithm,
1997                                     NULL);
1998
1999                 if (error != 0) {
2000                         /*
2001                          * We could work a little harder here. We could
2002                          * adjust our attempts to get information. It
2003                          * might be an ancient tape drive. If someone
2004                          * nudges us, we'll do that.
2005                          */
2006                         goto exit;
2007                 }
2008
2009                 /*
2010                  * If no quirk has determined that this is a device that is
2011                  * preferred to be in fixed or variable mode, now is the time
2012                  * to find out.
2013                  */
2014                 if ((softc->quirks & (SA_QUIRK_FIXED|SA_QUIRK_VARIABLE)) == 0) {
2015                         guessing = 1;
2016                         /*
2017                          * This could be expensive to find out. Luckily we
2018                          * only need to do this once. If we start out in
2019                          * 'default' mode, try and set ourselves to one
2020                          * of the densities that would determine a wad
2021                          * of other stuff. Go from highest to lowest.
2022                          */
2023                         if (softc->media_density == SCSI_DEFAULT_DENSITY) {
2024                                 int i;
2025                                 static u_int8_t ctry[] = {
2026                                         SCSI_DENSITY_HALFINCH_PE,
2027                                         SCSI_DENSITY_HALFINCH_6250C,
2028                                         SCSI_DENSITY_HALFINCH_6250,
2029                                         SCSI_DENSITY_HALFINCH_1600,
2030                                         SCSI_DENSITY_HALFINCH_800,
2031                                         SCSI_DENSITY_QIC_4GB,
2032                                         SCSI_DENSITY_QIC_2GB,
2033                                         SCSI_DENSITY_QIC_525_320,
2034                                         SCSI_DENSITY_QIC_150,
2035                                         SCSI_DENSITY_QIC_120,
2036                                         SCSI_DENSITY_QIC_24,
2037                                         SCSI_DENSITY_QIC_11_9TRK,
2038                                         SCSI_DENSITY_QIC_11_4TRK,
2039                                         SCSI_DENSITY_QIC_1320,
2040                                         SCSI_DENSITY_QIC_3080,
2041                                         0
2042                                 };
2043                                 for (i = 0; ctry[i]; i++) {
2044                                         error = sasetparams(periph,
2045                                             SA_PARAM_DENSITY, 0, ctry[i],
2046                                             0, SF_NO_PRINT);
2047                                         if (error == 0) {
2048                                                 softc->media_density = ctry[i];
2049                                                 break;
2050                                         }
2051                                 }
2052                         }
2053                         switch (softc->media_density) {
2054                         case SCSI_DENSITY_QIC_11_4TRK:
2055                         case SCSI_DENSITY_QIC_11_9TRK:
2056                         case SCSI_DENSITY_QIC_24:
2057                         case SCSI_DENSITY_QIC_120:
2058                         case SCSI_DENSITY_QIC_150:
2059                         case SCSI_DENSITY_QIC_525_320:
2060                         case SCSI_DENSITY_QIC_1320:
2061                         case SCSI_DENSITY_QIC_3080:
2062                                 softc->quirks &= ~SA_QUIRK_2FM;
2063                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2064                                 softc->last_media_blksize = 512;
2065                                 break;
2066                         case SCSI_DENSITY_QIC_4GB:
2067                         case SCSI_DENSITY_QIC_2GB:
2068                                 softc->quirks &= ~SA_QUIRK_2FM;
2069                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2070                                 softc->last_media_blksize = 1024;
2071                                 break;
2072                         default:
2073                                 softc->last_media_blksize =
2074                                     softc->media_blksize;
2075                                 softc->quirks |= SA_QUIRK_VARIABLE;
2076                                 break;
2077                         }
2078                 }
2079
2080                 /*
2081                  * If no quirk has determined that this is a device that needs
2082                  * to have 2 Filemarks at EOD, now is the time to find out.
2083                  */
2084
2085                 if ((softc->quirks & SA_QUIRK_2FM) == 0) {
2086                         switch (softc->media_density) {
2087                         case SCSI_DENSITY_HALFINCH_800:
2088                         case SCSI_DENSITY_HALFINCH_1600:
2089                         case SCSI_DENSITY_HALFINCH_6250:
2090                         case SCSI_DENSITY_HALFINCH_6250C:
2091                         case SCSI_DENSITY_HALFINCH_PE:
2092                                 softc->quirks &= ~SA_QUIRK_1FM;
2093                                 softc->quirks |= SA_QUIRK_2FM;
2094                                 break;
2095                         default:
2096                                 break;
2097                         }
2098                 }
2099
2100                 /*
2101                  * Now validate that some info we got makes sense.
2102                  */
2103                 if ((softc->max_blk < softc->media_blksize) ||
2104                     (softc->min_blk > softc->media_blksize &&
2105                     softc->media_blksize)) {
2106                         xpt_print(periph->path,
2107                             "BLOCK LIMITS (%d..%d) could not match current "
2108                             "block settings (%d)- adjusting\n", softc->min_blk,
2109                             softc->max_blk, softc->media_blksize);
2110                         softc->max_blk = softc->min_blk =
2111                             softc->media_blksize;
2112                 }
2113
2114                 /*
2115                  * Now put ourselves into the right frame of mind based
2116                  * upon quirks...
2117                  */
2118 tryagain:
2119                 /*
2120                  * If we want to be in FIXED mode and our current blocksize
2121                  * is not equal to our last blocksize (if nonzero), try and
2122                  * set ourselves to this last blocksize (as the 'preferred'
2123                  * block size).  The initial quirkmatch at registry sets the
2124                  * initial 'last' blocksize. If, for whatever reason, this
2125                  * 'last' blocksize is zero, set the blocksize to 512,
2126                  * or min_blk if that's larger.
2127                  */
2128                 if ((softc->quirks & SA_QUIRK_FIXED) &&
2129                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0 &&
2130                     (softc->media_blksize != softc->last_media_blksize)) {
2131                         softc->media_blksize = softc->last_media_blksize;
2132                         if (softc->media_blksize == 0) {
2133                                 softc->media_blksize = 512;
2134                                 if (softc->media_blksize < softc->min_blk) {
2135                                         softc->media_blksize = softc->min_blk;
2136                                 }
2137                         }
2138                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2139                             softc->media_blksize, 0, 0, SF_NO_PRINT);
2140                         if (error) {
2141                                 xpt_print(periph->path,
2142                                     "unable to set fixed blocksize to %d\n",
2143                                     softc->media_blksize);
2144                                 goto exit;
2145                         }
2146                 }
2147
2148                 if ((softc->quirks & SA_QUIRK_VARIABLE) &&
2149                     (softc->media_blksize != 0)) {
2150                         softc->last_media_blksize = softc->media_blksize;
2151                         softc->media_blksize = 0;
2152                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2153                             0, 0, 0, SF_NO_PRINT);
2154                         if (error) {
2155                                 /*
2156                                  * If this fails and we were guessing, just
2157                                  * assume that we got it wrong and go try
2158                                  * fixed block mode. Don't even check against
2159                                  * density code at this point.
2160                                  */
2161                                 if (guessing) {
2162                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
2163                                         softc->quirks |= SA_QUIRK_FIXED;
2164                                         if (softc->last_media_blksize == 0)
2165                                                 softc->last_media_blksize = 512;
2166                                         goto tryagain;
2167                                 }
2168                                 xpt_print(periph->path,
2169                                     "unable to set variable blocksize\n");
2170                                 goto exit;
2171                         }
2172                 }
2173
2174                 /*
2175                  * Now that we have the current block size,
2176                  * set up some parameters for sastart's usage.
2177                  */
2178                 if (softc->media_blksize) {
2179                         softc->flags |= SA_FLAG_FIXED;
2180                         if (powerof2(softc->media_blksize)) {
2181                                 softc->blk_shift =
2182                                     ffs(softc->media_blksize) - 1;
2183                                 softc->blk_mask = softc->media_blksize - 1;
2184                         } else {
2185                                 softc->blk_mask = ~0;
2186                                 softc->blk_shift = 0;
2187                         }
2188                 } else {
2189                         /*
2190                          * The SCSI-3 spec allows 0 to mean "unspecified".
2191                          * The SCSI-1 spec allows 0 to mean 'infinite'.
2192                          *
2193                          * Either works here.
2194                          */
2195                         if (softc->max_blk == 0) {
2196                                 softc->max_blk = ~0;
2197                         }
2198                         softc->blk_shift = 0;
2199                         if (softc->blk_gran != 0) {
2200                                 softc->blk_mask = softc->blk_gran - 1;
2201                         } else {
2202                                 softc->blk_mask = 0;
2203                         }
2204                 }
2205
2206                 if (write_protect)
2207                         softc->flags |= SA_FLAG_TAPE_WP;
2208
2209                 if (comp_supported) {
2210                         if (softc->saved_comp_algorithm == 0)
2211                                 softc->saved_comp_algorithm =
2212                                     softc->comp_algorithm;
2213                         softc->flags |= SA_FLAG_COMP_SUPP;
2214                         if (comp_enabled)
2215                                 softc->flags |= SA_FLAG_COMP_ENABLED;
2216                 } else
2217                         softc->flags |= SA_FLAG_COMP_UNSUPP;
2218
2219                 if ((softc->buffer_mode == SMH_SA_BUF_MODE_NOBUF) &&
2220                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0) {
2221                         error = sasetparams(periph, SA_PARAM_BUFF_MODE, 0,
2222                             0, 0, SF_NO_PRINT);
2223                         if (error == 0) {
2224                                 softc->buffer_mode = SMH_SA_BUF_MODE_SIBUF;
2225                         } else {
2226                                 xpt_print(periph->path,
2227                                     "unable to set buffered mode\n");
2228                         }
2229                         error = 0;      /* not an error */
2230                 }
2231
2232
2233                 if (error == 0) {
2234                         softc->flags |= SA_FLAG_TAPE_MOUNTED;
2235                 }
2236 exit:
2237                 if (rblim != NULL)
2238                         free(rblim, M_SCSISA);
2239
2240                 if (error != 0) {
2241                         softc->dsreg = MTIO_DSREG_NIL;
2242                 } else {
2243                         softc->fileno = softc->blkno = 0;
2244                         softc->dsreg = MTIO_DSREG_REST;
2245                 }
2246 #ifdef  SA_1FM_AT_EOD
2247                 if ((softc->quirks & SA_QUIRK_2FM) == 0)
2248                         softc->quirks |= SA_QUIRK_1FM;
2249 #else
2250                 if ((softc->quirks & SA_QUIRK_1FM) == 0)
2251                         softc->quirks |= SA_QUIRK_2FM;
2252 #endif
2253         } else
2254                 xpt_release_ccb(ccb);
2255
2256         /*
2257          * If we return an error, we're not mounted any more,
2258          * so release any device reservation.
2259          */
2260         if (error != 0) {
2261                 (void) sareservereleaseunit(periph, FALSE);
2262         } else {
2263                 /*
2264                  * Clear I/O residual.
2265                  */
2266                 softc->last_io_resid = 0;
2267                 softc->last_ctl_resid = 0;
2268         }
2269         return (error);
2270 }
2271
2272 /*
2273  * How many filemarks do we need to write if we were to terminate the
2274  * tape session right now? Note that this can be a negative number
2275  */
2276
2277 static int
2278 samarkswanted(struct cam_periph *periph)
2279 {
2280         int     markswanted;
2281         struct  sa_softc *softc;
2282
2283         softc = (struct sa_softc *)periph->softc;
2284         markswanted = 0;
2285         if ((softc->flags & SA_FLAG_TAPE_WRITTEN) != 0) {
2286                 markswanted++;
2287                 if (softc->quirks & SA_QUIRK_2FM)
2288                         markswanted++;
2289         }
2290         markswanted -= softc->filemarks;
2291         return (markswanted);
2292 }
2293
2294 static int
2295 sacheckeod(struct cam_periph *periph)
2296 {
2297         int     error;
2298         int     markswanted;
2299
2300         markswanted = samarkswanted(periph);
2301
2302         if (markswanted > 0) {
2303                 error = sawritefilemarks(periph, markswanted, FALSE);
2304         } else {
2305                 error = 0;
2306         }
2307         return (error);
2308 }
2309
2310 static int
2311 saerror(union ccb *ccb, u_int32_t cflgs, u_int32_t sflgs)
2312 {
2313         static const char *toobig =
2314             "%d-byte tape record bigger than supplied buffer\n";
2315         struct  cam_periph *periph;
2316         struct  sa_softc *softc;
2317         struct  ccb_scsiio *csio;
2318         struct  scsi_sense_data *sense;
2319         u_int32_t resid = 0;
2320         int32_t info = 0;
2321         cam_status status;
2322         int error_code, sense_key, asc, ascq, error, aqvalid;
2323
2324         periph = xpt_path_periph(ccb->ccb_h.path);
2325         softc = (struct sa_softc *)periph->softc;
2326         csio = &ccb->csio;
2327         sense = &csio->sense_data;
2328         scsi_extract_sense(sense, &error_code, &sense_key, &asc, &ascq);
2329         aqvalid = sense->extra_len >= 6;
2330         error = 0;
2331
2332         status = csio->ccb_h.status & CAM_STATUS_MASK;
2333
2334         /*
2335          * Calculate/latch up, any residuals... We do this in a funny 2-step
2336          * so we can print stuff here if we have CAM_DEBUG enabled for this
2337          * unit.
2338          */
2339         if (status == CAM_SCSI_STATUS_ERROR) {
2340                 if ((sense->error_code & SSD_ERRCODE_VALID) != 0) {
2341                         info = (int32_t) scsi_4btoul(sense->info);
2342                         resid = info;
2343                         if ((softc->flags & SA_FLAG_FIXED) != 0)
2344                                 resid *= softc->media_blksize;
2345                 } else {
2346                         resid = csio->dxfer_len;
2347                         info = resid;
2348                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
2349                                 if (softc->media_blksize)
2350                                         info /= softc->media_blksize;
2351                         }
2352                 }
2353                 if (CCB_Type(csio) == SA_CCB_BUFFER_IO) {
2354                         bcopy((caddr_t) sense, (caddr_t) &softc->last_io_sense,
2355                             sizeof (struct scsi_sense_data));
2356                         bcopy(csio->cdb_io.cdb_bytes, softc->last_io_cdb,
2357                             (int) csio->cdb_len);
2358                         softc->last_io_resid = resid;
2359                         softc->last_resid_was_io = 1;
2360                 } else {
2361                         bcopy((caddr_t) sense, (caddr_t) &softc->last_ctl_sense,
2362                             sizeof (struct scsi_sense_data));
2363                         bcopy(csio->cdb_io.cdb_bytes, softc->last_ctl_cdb,
2364                             (int) csio->cdb_len);
2365                         softc->last_ctl_resid = resid;
2366                         softc->last_resid_was_io = 0;
2367                 }
2368                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("CDB[0]=0x%x Key 0x%x "
2369                     "ASC/ASCQ 0x%x/0x%x CAM STATUS 0x%x flags 0x%x resid %d "
2370                     "dxfer_len %d\n", csio->cdb_io.cdb_bytes[0] & 0xff,
2371                     sense_key, asc, ascq, status,
2372                     sense->flags & ~SSD_KEY_RESERVED, resid, csio->dxfer_len));
2373         } else {
2374                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
2375                     ("Cam Status 0x%x\n", status));
2376         }
2377
2378         switch (status) {
2379         case CAM_REQ_CMP:
2380                 return (0);
2381         case CAM_SCSI_STATUS_ERROR:
2382                 /*
2383                  * If a read/write command, we handle it here.
2384                  */
2385                 if (CCB_Type(csio) != SA_CCB_WAITING) {
2386                         break;
2387                 }
2388                 /*
2389                  * If this was just EOM/EOP, Filemark, Setmark or ILI detected
2390                  * on a non read/write command, we assume it's not an error
2391                  * and propagate the residule and return.
2392                  */
2393                 if ((aqvalid && asc == 0 && ascq > 0 && ascq <= 5) ||
2394                     (aqvalid == 0 && sense_key == SSD_KEY_NO_SENSE)) {
2395                         csio->resid = resid;
2396                         QFRLS(ccb);
2397                         return (0);
2398                 }
2399                 /*
2400                  * Otherwise, we let the common code handle this.
2401                  */
2402                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2403
2404         /*
2405          * XXX: To Be Fixed
2406          * We cannot depend upon CAM honoring retry counts for these.
2407          */
2408         case CAM_SCSI_BUS_RESET:
2409         case CAM_BDR_SENT:
2410                 if (ccb->ccb_h.retry_count <= 0) {
2411                         return (EIO);
2412                 }
2413                 /* FALLTHROUGH */
2414         default:
2415                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2416         }
2417
2418         /*
2419          * Handle filemark, end of tape, mismatched record sizes....
2420          * From this point out, we're only handling read/write cases.
2421          * Handle writes && reads differently.
2422          */
2423
2424         if (csio->cdb_io.cdb_bytes[0] == SA_WRITE) {
2425                 if (sense_key == SSD_KEY_VOLUME_OVERFLOW) {
2426                         csio->resid = resid;
2427                         error = ENOSPC;
2428                 } else if (sense->flags & SSD_EOM) {
2429                         softc->flags |= SA_FLAG_EOM_PENDING;
2430                         /*
2431                          * Grotesque as it seems, the few times
2432                          * I've actually seen a non-zero resid,
2433                          * the tape drive actually lied and had
2434                          * written all the data!.
2435                          */
2436                         csio->resid = 0;
2437                 }
2438         } else {
2439                 csio->resid = resid;
2440                 if (sense_key == SSD_KEY_BLANK_CHECK) {
2441                         if (softc->quirks & SA_QUIRK_1FM) {
2442                                 error = 0;
2443                                 softc->flags |= SA_FLAG_EOM_PENDING;
2444                         } else {
2445                                 error = EIO;
2446                         }
2447                 } else if (sense->flags & SSD_FILEMARK) {
2448                         if (softc->flags & SA_FLAG_FIXED) {
2449                                 error = -1;
2450                                 softc->flags |= SA_FLAG_EOF_PENDING;
2451                         }
2452                         /*
2453                          * Unconditionally, if we detected a filemark on a read,
2454                          * mark that we've run moved a file ahead.
2455                          */
2456                         if (softc->fileno != (daddr_t) -1) {
2457                                 softc->fileno++;
2458                                 softc->blkno = 0;
2459                                 csio->ccb_h.ccb_pflags |= SA_POSITION_UPDATED;
2460                         }
2461                 }
2462         }
2463
2464         /*
2465          * Incorrect Length usually applies to read, but can apply to writes.
2466          */
2467         if (error == 0 && (sense->flags & SSD_ILI)) {
2468                 if (info < 0) {
2469                         xpt_print(csio->ccb_h.path, toobig,
2470                             csio->dxfer_len - info);
2471                         csio->resid = csio->dxfer_len;
2472                         error = EIO;
2473                 } else {
2474                         csio->resid = resid;
2475                         if (softc->flags & SA_FLAG_FIXED) {
2476                                 softc->flags |= SA_FLAG_EIO_PENDING;
2477                         }
2478                         /*
2479                          * Bump the block number if we hadn't seen a filemark.
2480                          * Do this independent of errors (we've moved anyway).
2481                          */
2482                         if ((sense->flags & SSD_FILEMARK) == 0) {
2483                                 if (softc->blkno != (daddr_t) -1) {
2484                                         softc->blkno++;
2485                                         csio->ccb_h.ccb_pflags |=
2486                                            SA_POSITION_UPDATED;
2487                                 }
2488                         }
2489                 }
2490         }
2491
2492         if (error <= 0) {
2493                 /*
2494                  * Unfreeze the queue if frozen as we're not returning anything
2495                  * to our waiters that would indicate an I/O error has occurred
2496                  * (yet).
2497                  */
2498                 QFRLS(ccb);
2499                 error = 0;
2500         }
2501         return (error);
2502 }
2503
2504 static int
2505 sagetparams(struct cam_periph *periph, sa_params params_to_get,
2506             u_int32_t *blocksize, u_int8_t *density, u_int32_t *numblocks,
2507             int *buff_mode, u_int8_t *write_protect, u_int8_t *speed,
2508             int *comp_supported, int *comp_enabled, u_int32_t *comp_algorithm,
2509             sa_comp_t *tcs)
2510 {
2511         union ccb *ccb;
2512         void *mode_buffer;
2513         struct scsi_mode_header_6 *mode_hdr;
2514         struct scsi_mode_blk_desc *mode_blk;
2515         int mode_buffer_len;
2516         struct sa_softc *softc;
2517         u_int8_t cpage;
2518         int error;
2519         cam_status status;
2520
2521         softc = (struct sa_softc *)periph->softc;
2522         ccb = cam_periph_getccb(periph, 1);
2523         if (softc->quirks & SA_QUIRK_NO_CPAGE)
2524                 cpage = SA_DEVICE_CONFIGURATION_PAGE;
2525         else
2526                 cpage = SA_DATA_COMPRESSION_PAGE;
2527
2528 retry:
2529         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2530
2531         if (params_to_get & SA_PARAM_COMPRESSION) {
2532                 if (softc->quirks & SA_QUIRK_NOCOMP) {
2533                         *comp_supported = FALSE;
2534                         params_to_get &= ~SA_PARAM_COMPRESSION;
2535                 } else
2536                         mode_buffer_len += sizeof (sa_comp_t);
2537         }
2538
2539         /* XXX Fix M_NOWAIT */
2540         mode_buffer = malloc(mode_buffer_len, M_SCSISA, M_NOWAIT | M_ZERO);
2541         if (mode_buffer == NULL) {
2542                 xpt_release_ccb(ccb);
2543                 return (ENOMEM);
2544         }
2545         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2546         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2547
2548         /* it is safe to retry this */
2549         scsi_mode_sense(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2550             SMS_PAGE_CTRL_CURRENT, (params_to_get & SA_PARAM_COMPRESSION) ?
2551             cpage : SMS_VENDOR_SPECIFIC_PAGE, mode_buffer, mode_buffer_len,
2552             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2553
2554         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2555             softc->device_stats);
2556         QFRLS(ccb);
2557
2558         status = ccb->ccb_h.status & CAM_STATUS_MASK;
2559
2560         if (error == EINVAL && (params_to_get & SA_PARAM_COMPRESSION) != 0) {
2561                 /*
2562                  * Hmm. Let's see if we can try another page...
2563                  * If we've already done that, give up on compression
2564                  * for this device and remember this for the future
2565                  * and attempt the request without asking for compression
2566                  * info.
2567                  */
2568                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2569                         cpage = SA_DEVICE_CONFIGURATION_PAGE;
2570                         goto retry;
2571                 }
2572                 softc->quirks |= SA_QUIRK_NOCOMP;
2573                 free(mode_buffer, M_SCSISA);
2574                 goto retry;
2575         } else if (status == CAM_SCSI_STATUS_ERROR) {
2576                 /* Tell the user about the fatal error. */
2577                 scsi_sense_print(&ccb->csio);
2578                 goto sagetparamsexit;
2579         }
2580
2581         /*
2582          * If the user only wants the compression information, and
2583          * the device doesn't send back the block descriptor, it's
2584          * no big deal.  If the user wants more than just
2585          * compression, though, and the device doesn't pass back the
2586          * block descriptor, we need to send another mode sense to
2587          * get the block descriptor.
2588          */
2589         if ((mode_hdr->blk_desc_len == 0) &&
2590             (params_to_get & SA_PARAM_COMPRESSION) &&
2591             (params_to_get & ~(SA_PARAM_COMPRESSION))) {
2592
2593                 /*
2594                  * Decrease the mode buffer length by the size of
2595                  * the compression page, to make sure the data
2596                  * there doesn't get overwritten.
2597                  */
2598                 mode_buffer_len -= sizeof (sa_comp_t);
2599
2600                 /*
2601                  * Now move the compression page that we presumably
2602                  * got back down the memory chunk a little bit so
2603                  * it doesn't get spammed.
2604                  */
2605                 bcopy(&mode_hdr[0], &mode_hdr[1], sizeof (sa_comp_t));
2606                 bzero(&mode_hdr[0], sizeof (mode_hdr[0]));
2607
2608                 /*
2609                  * Now, we issue another mode sense and just ask
2610                  * for the block descriptor, etc.
2611                  */
2612
2613                 scsi_mode_sense(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2614                     SMS_PAGE_CTRL_CURRENT, SMS_VENDOR_SPECIFIC_PAGE,
2615                     mode_buffer, mode_buffer_len, SSD_FULL_SIZE,
2616                     SCSIOP_TIMEOUT);
2617
2618                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2619                     softc->device_stats);
2620                 QFRLS(ccb);
2621
2622                 if (error != 0)
2623                         goto sagetparamsexit;
2624         }
2625
2626         if (params_to_get & SA_PARAM_BLOCKSIZE)
2627                 *blocksize = scsi_3btoul(mode_blk->blklen);
2628
2629         if (params_to_get & SA_PARAM_NUMBLOCKS)
2630                 *numblocks = scsi_3btoul(mode_blk->nblocks);
2631
2632         if (params_to_get & SA_PARAM_BUFF_MODE)
2633                 *buff_mode = mode_hdr->dev_spec & SMH_SA_BUF_MODE_MASK;
2634
2635         if (params_to_get & SA_PARAM_DENSITY)
2636                 *density = mode_blk->density;
2637
2638         if (params_to_get & SA_PARAM_WP)
2639                 *write_protect = (mode_hdr->dev_spec & SMH_SA_WP)? TRUE : FALSE;
2640
2641         if (params_to_get & SA_PARAM_SPEED)
2642                 *speed = mode_hdr->dev_spec & SMH_SA_SPEED_MASK;
2643
2644         if (params_to_get & SA_PARAM_COMPRESSION) {
2645                 sa_comp_t *ntcs = (sa_comp_t *) &mode_blk[1];
2646                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2647                         struct scsi_data_compression_page *cp = &ntcs->dcomp;
2648                         *comp_supported =
2649                             (cp->dce_and_dcc & SA_DCP_DCC)? TRUE : FALSE;
2650                         *comp_enabled =
2651                             (cp->dce_and_dcc & SA_DCP_DCE)? TRUE : FALSE;
2652                         *comp_algorithm = scsi_4btoul(cp->comp_algorithm);
2653                 } else {
2654                         struct scsi_dev_conf_page *cp = &ntcs->dconf;
2655                         /*
2656                          * We don't really know whether this device supports
2657                          * Data Compression if the the algorithm field is
2658                          * zero. Just say we do.
2659                          */
2660                         *comp_supported = TRUE;
2661                         *comp_enabled =
2662                             (cp->sel_comp_alg != SA_COMP_NONE)? TRUE : FALSE;
2663                         *comp_algorithm = cp->sel_comp_alg;
2664                 }
2665                 if (tcs != NULL)
2666                         bcopy(ntcs, tcs, sizeof (sa_comp_t));
2667         }
2668
2669         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2670                 int idx;
2671                 char *xyz = mode_buffer;
2672                 xpt_print_path(periph->path);
2673                 printf("Mode Sense Data=");
2674                 for (idx = 0; idx < mode_buffer_len; idx++)
2675                         printf(" 0x%02x", xyz[idx] & 0xff);
2676                 printf("\n");
2677         }
2678
2679 sagetparamsexit:
2680
2681         xpt_release_ccb(ccb);
2682         free(mode_buffer, M_SCSISA);
2683         return (error);
2684 }
2685
2686 /*
2687  * The purpose of this function is to set one of four different parameters
2688  * for a tape drive:
2689  *      - blocksize
2690  *      - density
2691  *      - compression / compression algorithm
2692  *      - buffering mode
2693  *
2694  * The assumption is that this will be called from saioctl(), and therefore
2695  * from a process context.  Thus the waiting malloc calls below.  If that
2696  * assumption ever changes, the malloc calls should be changed to be
2697  * NOWAIT mallocs.
2698  *
2699  * Any or all of the four parameters may be set when this function is
2700  * called.  It should handle setting more than one parameter at once.
2701  */
2702 static int
2703 sasetparams(struct cam_periph *periph, sa_params params_to_set,
2704             u_int32_t blocksize, u_int8_t density, u_int32_t calg,
2705             u_int32_t sense_flags)
2706 {
2707         struct sa_softc *softc;
2708         u_int32_t current_blocksize;
2709         u_int32_t current_calg;
2710         u_int8_t current_density;
2711         u_int8_t current_speed;
2712         int comp_enabled, comp_supported;
2713         void *mode_buffer;
2714         int mode_buffer_len;
2715         struct scsi_mode_header_6 *mode_hdr;
2716         struct scsi_mode_blk_desc *mode_blk;
2717         sa_comp_t *ccomp, *cpage;
2718         int buff_mode;
2719         union ccb *ccb = NULL;
2720         int error;
2721
2722         softc = (struct sa_softc *)periph->softc;
2723
2724         ccomp = malloc(sizeof (sa_comp_t), M_SCSISA, M_NOWAIT);
2725         if (ccomp == NULL)
2726                 return (ENOMEM);
2727
2728         /*
2729          * Since it doesn't make sense to set the number of blocks, or
2730          * write protection, we won't try to get the current value.  We
2731          * always want to get the blocksize, so we can set it back to the
2732          * proper value.
2733          */
2734         error = sagetparams(periph,
2735             params_to_set | SA_PARAM_BLOCKSIZE | SA_PARAM_SPEED,
2736             &current_blocksize, &current_density, NULL, &buff_mode, NULL,
2737             &current_speed, &comp_supported, &comp_enabled,
2738             &current_calg, ccomp);
2739
2740         if (error != 0) {
2741                 free(ccomp, M_SCSISA);
2742                 return (error);
2743         }
2744
2745         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2746         if (params_to_set & SA_PARAM_COMPRESSION)
2747                 mode_buffer_len += sizeof (sa_comp_t);
2748
2749         mode_buffer = malloc(mode_buffer_len, M_SCSISA, M_NOWAIT | M_ZERO);
2750         if (mode_buffer == NULL) {
2751                 free(ccomp, M_SCSISA);
2752                 return (ENOMEM);
2753         }
2754
2755         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2756         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2757
2758         ccb = cam_periph_getccb(periph, 1);
2759
2760 retry:
2761
2762         if (params_to_set & SA_PARAM_COMPRESSION) {
2763                 if (mode_blk) {
2764                         cpage = (sa_comp_t *)&mode_blk[1];
2765                 } else {
2766                         cpage = (sa_comp_t *)&mode_hdr[1];
2767                 }
2768                 bcopy(ccomp, cpage, sizeof (sa_comp_t));
2769                 cpage->hdr.pagecode &= ~0x80;
2770         } else
2771                 cpage = NULL;
2772
2773         /*
2774          * If the caller wants us to set the blocksize, use the one they
2775          * pass in.  Otherwise, use the blocksize we got back from the
2776          * mode select above.
2777          */
2778         if (mode_blk) {
2779                 if (params_to_set & SA_PARAM_BLOCKSIZE)
2780                         scsi_ulto3b(blocksize, mode_blk->blklen);
2781                 else
2782                         scsi_ulto3b(current_blocksize, mode_blk->blklen);
2783
2784                 /*
2785                  * Set density if requested, else preserve old density.
2786                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2787                  * devices, else density we've latched up in our softc.
2788                  */
2789                 if (params_to_set & SA_PARAM_DENSITY) {
2790                         mode_blk->density = density;
2791                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2792                         mode_blk->density = SCSI_SAME_DENSITY;
2793                 } else {
2794                         mode_blk->density = softc->media_density;
2795                 }
2796         }
2797
2798         /*
2799          * For mode selects, these two fields must be zero.
2800          */
2801         mode_hdr->data_length = 0;
2802         mode_hdr->medium_type = 0;
2803
2804         /* set the speed to the current value */
2805         mode_hdr->dev_spec = current_speed;
2806
2807         /* if set, set single-initiator buffering mode */
2808         if (softc->buffer_mode == SMH_SA_BUF_MODE_SIBUF) {
2809                 mode_hdr->dev_spec |= SMH_SA_BUF_MODE_SIBUF;
2810         }
2811
2812         if (mode_blk)
2813                 mode_hdr->blk_desc_len = sizeof(struct scsi_mode_blk_desc);
2814         else
2815                 mode_hdr->blk_desc_len = 0;
2816
2817         /*
2818          * First, if the user wants us to set the compression algorithm or
2819          * just turn compression on, check to make sure that this drive
2820          * supports compression.
2821          */
2822         if (params_to_set & SA_PARAM_COMPRESSION) {
2823                 /*
2824                  * If the compression algorithm is 0, disable compression.
2825                  * If the compression algorithm is non-zero, enable
2826                  * compression and set the compression type to the
2827                  * specified compression algorithm, unless the algorithm is
2828                  * MT_COMP_ENABLE.  In that case, we look at the
2829                  * compression algorithm that is currently set and if it is
2830                  * non-zero, we leave it as-is.  If it is zero, and we have
2831                  * saved a compression algorithm from a time when
2832                  * compression was enabled before, set the compression to
2833                  * the saved value.
2834                  */
2835                 switch (ccomp->hdr.pagecode & ~0x80) {
2836                 case SA_DEVICE_CONFIGURATION_PAGE:
2837                 {
2838                         struct scsi_dev_conf_page *dcp = &cpage->dconf;
2839                         if (calg == 0) {
2840                                 dcp->sel_comp_alg = SA_COMP_NONE;
2841                                 break;
2842                         }
2843                         if (calg != MT_COMP_ENABLE) {
2844                                 dcp->sel_comp_alg = calg;
2845                         } else if (dcp->sel_comp_alg == SA_COMP_NONE &&
2846                             softc->saved_comp_algorithm != 0) {
2847                                 dcp->sel_comp_alg = softc->saved_comp_algorithm;
2848                         }
2849                         break;
2850                 }
2851                 case SA_DATA_COMPRESSION_PAGE:
2852                 if (ccomp->dcomp.dce_and_dcc & SA_DCP_DCC) {
2853                         struct scsi_data_compression_page *dcp = &cpage->dcomp;
2854                         if (calg == 0) {
2855                                 /*
2856                                  * Disable compression, but leave the
2857                                  * decompression and the capability bit
2858                                  * alone.
2859                                  */
2860                                 dcp->dce_and_dcc = SA_DCP_DCC;
2861                                 dcp->dde_and_red |= SA_DCP_DDE;
2862                                 break;
2863                         }
2864                         /* enable compression && decompression */
2865                         dcp->dce_and_dcc = SA_DCP_DCE | SA_DCP_DCC;
2866                         dcp->dde_and_red |= SA_DCP_DDE;
2867                         /*
2868                          * If there, use compression algorithm from caller.
2869                          * Otherwise, if there's a saved compression algorithm
2870                          * and there is no current algorithm, use the saved
2871                          * algorithm. Else parrot back what we got and hope
2872                          * for the best.
2873                          */
2874                         if (calg != MT_COMP_ENABLE) {
2875                                 scsi_ulto4b(calg, dcp->comp_algorithm);
2876                                 scsi_ulto4b(calg, dcp->decomp_algorithm);
2877                         } else if (scsi_4btoul(dcp->comp_algorithm) == 0 &&
2878                             softc->saved_comp_algorithm != 0) {
2879                                 scsi_ulto4b(softc->saved_comp_algorithm,
2880                                     dcp->comp_algorithm);
2881                                 scsi_ulto4b(softc->saved_comp_algorithm,
2882                                     dcp->decomp_algorithm);
2883                         }
2884                         break;
2885                 }
2886                 /*
2887                  * Compression does not appear to be supported-
2888                  * at least via the DATA COMPRESSION page. It
2889                  * would be too much to ask us to believe that
2890                  * the page itself is supported, but incorrectly
2891                  * reports an ability to manipulate data compression,
2892                  * so we'll assume that this device doesn't support
2893                  * compression. We can just fall through for that.
2894                  */
2895                 /* FALLTHROUGH */
2896                 default:
2897                         /*
2898                          * The drive doesn't seem to support compression,
2899                          * so turn off the set compression bit.
2900                          */
2901                         params_to_set &= ~SA_PARAM_COMPRESSION;
2902                         xpt_print(periph->path,
2903                             "device does not seem to support compression\n");
2904
2905                         /*
2906                          * If that was the only thing the user wanted us to set,
2907                          * clean up allocated resources and return with
2908                          * 'operation not supported'.
2909                          */
2910                         if (params_to_set == SA_PARAM_NONE) {
2911                                 free(mode_buffer, M_SCSISA);
2912                                 xpt_release_ccb(ccb);
2913                                 return (ENODEV);
2914                         }
2915
2916                         /*
2917                          * That wasn't the only thing the user wanted us to set.
2918                          * So, decrease the stated mode buffer length by the
2919                          * size of the compression mode page.
2920                          */
2921                         mode_buffer_len -= sizeof(sa_comp_t);
2922                 }
2923         }
2924
2925         /* It is safe to retry this operation */
2926         scsi_mode_select(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
2927             (params_to_set & SA_PARAM_COMPRESSION)? TRUE : FALSE,
2928             FALSE, mode_buffer, mode_buffer_len, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2929
2930         error = cam_periph_runccb(ccb, saerror, 0,
2931             sense_flags, softc->device_stats);
2932         QFRLS(ccb);
2933
2934         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2935                 int idx;
2936                 char *xyz = mode_buffer;
2937                 xpt_print_path(periph->path);
2938                 printf("Err%d, Mode Select Data=", error);
2939                 for (idx = 0; idx < mode_buffer_len; idx++)
2940                         printf(" 0x%02x", xyz[idx] & 0xff);
2941                 printf("\n");
2942         }
2943
2944
2945         if (error) {
2946                 /*
2947                  * If we can, try without setting density/blocksize.
2948                  */
2949                 if (mode_blk) {
2950                         if ((params_to_set &
2951                             (SA_PARAM_DENSITY|SA_PARAM_BLOCKSIZE)) == 0) {
2952                                 mode_blk = NULL;
2953                                 goto retry;
2954                         }
2955                 } else {
2956                         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2957                         cpage = (sa_comp_t *)&mode_blk[1];
2958                 }
2959
2960                 /*
2961                  * If we were setting the blocksize, and that failed, we
2962                  * want to set it to its original value.  If we weren't
2963                  * setting the blocksize, we don't want to change it.
2964                  */
2965                 scsi_ulto3b(current_blocksize, mode_blk->blklen);
2966
2967                 /*
2968                  * Set density if requested, else preserve old density.
2969                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2970                  * devices, else density we've latched up in our softc.
2971                  */
2972                 if (params_to_set & SA_PARAM_DENSITY) {
2973                         mode_blk->density = current_density;
2974                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2975                         mode_blk->density = SCSI_SAME_DENSITY;
2976                 } else {
2977                         mode_blk->density = softc->media_density;
2978                 }
2979
2980                 if (params_to_set & SA_PARAM_COMPRESSION)
2981                         bcopy(ccomp, cpage, sizeof (sa_comp_t));
2982
2983                 /*
2984                  * The retry count is the only CCB field that might have been
2985                  * changed that we care about, so reset it back to 1.
2986                  */
2987                 ccb->ccb_h.retry_count = 1;
2988                 cam_periph_runccb(ccb, saerror, 0, sense_flags,
2989                     softc->device_stats);
2990                 QFRLS(ccb);
2991         }
2992
2993         xpt_release_ccb(ccb);
2994
2995         if (ccomp != NULL)
2996                 free(ccomp, M_SCSISA);
2997
2998         if (params_to_set & SA_PARAM_COMPRESSION) {
2999                 if (error) {
3000                         softc->flags &= ~SA_FLAG_COMP_ENABLED;
3001                         /*
3002                          * Even if we get an error setting compression,
3003                          * do not say that we don't support it. We could
3004                          * have been wrong, or it may be media specific.
3005                          *      softc->flags &= ~SA_FLAG_COMP_SUPP;
3006                          */
3007                         softc->saved_comp_algorithm = softc->comp_algorithm;
3008                         softc->comp_algorithm = 0;
3009                 } else {
3010                         softc->flags |= SA_FLAG_COMP_ENABLED;
3011                         softc->comp_algorithm = calg;
3012                 }
3013         }
3014
3015         free(mode_buffer, M_SCSISA);
3016         return (error);
3017 }
3018
3019 static void
3020 saprevent(struct cam_periph *periph, int action)
3021 {
3022         struct  sa_softc *softc;
3023         union   ccb *ccb;
3024         int     error, sf;
3025
3026         softc = (struct sa_softc *)periph->softc;
3027
3028         if ((action == PR_ALLOW) && (softc->flags & SA_FLAG_TAPE_LOCKED) == 0)
3029                 return;
3030         if ((action == PR_PREVENT) && (softc->flags & SA_FLAG_TAPE_LOCKED) != 0)
3031                 return;
3032
3033         /*
3034          * We can be quiet about illegal requests.
3035          */
3036         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
3037                 sf = 0;
3038         } else
3039                 sf = SF_QUIET_IR;
3040
3041         ccb = cam_periph_getccb(periph, 1);
3042
3043         /* It is safe to retry this operation */
3044         scsi_prevent(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, action,
3045             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3046
3047         error = cam_periph_runccb(ccb, saerror, 0, sf, softc->device_stats);
3048         QFRLS(ccb);
3049         if (error == 0) {
3050                 if (action == PR_ALLOW)
3051                         softc->flags &= ~SA_FLAG_TAPE_LOCKED;
3052                 else
3053                         softc->flags |= SA_FLAG_TAPE_LOCKED;
3054         }
3055
3056         xpt_release_ccb(ccb);
3057 }
3058
3059 static int
3060 sarewind(struct cam_periph *periph)
3061 {
3062         union   ccb *ccb;
3063         struct  sa_softc *softc;
3064         int     error;
3065
3066         softc = (struct sa_softc *)periph->softc;
3067
3068         ccb = cam_periph_getccb(periph, 1);
3069
3070         /* It is safe to retry this operation */
3071         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3072             SSD_FULL_SIZE, REWIND_TIMEOUT);
3073
3074         softc->dsreg = MTIO_DSREG_REW;
3075         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3076         softc->dsreg = MTIO_DSREG_REST;
3077
3078         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3079                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3080
3081         xpt_release_ccb(ccb);
3082         if (error == 0)
3083                 softc->fileno = softc->blkno = (daddr_t) 0;
3084         else
3085                 softc->fileno = softc->blkno = (daddr_t) -1;
3086         return (error);
3087 }
3088
3089 static int
3090 saspace(struct cam_periph *periph, int count, scsi_space_code code)
3091 {
3092         union   ccb *ccb;
3093         struct  sa_softc *softc;
3094         int     error;
3095
3096         softc = (struct sa_softc *)periph->softc;
3097
3098         ccb = cam_periph_getccb(periph, 1);
3099
3100         /* This cannot be retried */
3101
3102         scsi_space(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG, code, count,
3103             SSD_FULL_SIZE, SPACE_TIMEOUT);
3104
3105         /*
3106          * Clear residual because we will be using it.
3107          */
3108         softc->last_ctl_resid = 0;
3109
3110         softc->dsreg = (count < 0)? MTIO_DSREG_REV : MTIO_DSREG_FWD;
3111         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3112         softc->dsreg = MTIO_DSREG_REST;
3113
3114         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3115                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3116
3117         xpt_release_ccb(ccb);
3118
3119         /*
3120          * If a spacing operation has failed, we need to invalidate
3121          * this mount.
3122          *
3123          * If the spacing operation was setmarks or to end of recorded data,
3124          * we no longer know our relative position.
3125          *
3126          * If the spacing operations was spacing files in reverse, we
3127          * take account of the residual, but still check against less
3128          * than zero- if we've gone negative, we must have hit BOT.
3129          *
3130          * If the spacing operations was spacing records in reverse and
3131          * we have a residual, we've either hit BOT or hit a filemark.
3132          * In the former case, we know our new record number (0). In
3133          * the latter case, we have absolutely no idea what the real
3134          * record number is- we've stopped between the end of the last
3135          * record in the previous file and the filemark that stopped
3136          * our spacing backwards.
3137          */
3138         if (error) {
3139                 softc->fileno = softc->blkno = (daddr_t) -1;
3140         } else if (code == SS_SETMARKS || code == SS_EOD) {
3141                 softc->fileno = softc->blkno = (daddr_t) -1;
3142         } else if (code == SS_FILEMARKS && softc->fileno != (daddr_t) -1) {
3143                 softc->fileno += (count - softc->last_ctl_resid);
3144                 if (softc->fileno < 0)  /* we must of hit BOT */
3145                         softc->fileno = 0;
3146                 softc->blkno = 0;
3147         } else if (code == SS_BLOCKS && softc->blkno != (daddr_t) -1) {
3148                 softc->blkno += (count - softc->last_ctl_resid);
3149                 if (count < 0) {
3150                         if (softc->last_ctl_resid || softc->blkno < 0) {
3151                                 if (softc->fileno == 0) {
3152                                         softc->blkno = 0;
3153                                 } else {
3154                                         softc->blkno = (daddr_t) -1;
3155                                 }
3156                         }
3157                 }
3158         }
3159         return (error);
3160 }
3161
3162 static int
3163 sawritefilemarks(struct cam_periph *periph, int nmarks, int setmarks)
3164 {
3165         union   ccb *ccb;
3166         struct  sa_softc *softc;
3167         int     error, nwm = 0;
3168
3169         softc = (struct sa_softc *)periph->softc;
3170         if (softc->open_rdonly)
3171                 return (EBADF);
3172
3173         ccb = cam_periph_getccb(periph, 1);
3174         /*
3175          * Clear residual because we will be using it.
3176          */
3177         softc->last_ctl_resid = 0;
3178
3179         softc->dsreg = MTIO_DSREG_FMK;
3180         /* this *must* not be retried */
3181         scsi_write_filemarks(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG,
3182             FALSE, setmarks, nmarks, SSD_FULL_SIZE, IO_TIMEOUT);
3183         softc->dsreg = MTIO_DSREG_REST;
3184
3185
3186         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3187
3188         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3189                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3190
3191         if (error == 0 && nmarks) {
3192                 struct sa_softc *softc = (struct sa_softc *)periph->softc;
3193                 nwm = nmarks - softc->last_ctl_resid;
3194                 softc->filemarks += nwm;
3195         }
3196
3197         xpt_release_ccb(ccb);
3198
3199         /*
3200          * Update relative positions (if we're doing that).
3201          */
3202         if (error) {
3203                 softc->fileno = softc->blkno = (daddr_t) -1;
3204         } else if (softc->fileno != (daddr_t) -1) {
3205                 softc->fileno += nwm;
3206                 softc->blkno = 0;
3207         }
3208         return (error);
3209 }
3210
3211 static int
3212 sardpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3213 {
3214         struct scsi_tape_position_data loc;
3215         union ccb *ccb;
3216         struct sa_softc *softc = (struct sa_softc *)periph->softc;
3217         int error;
3218
3219         /*
3220          * We try and flush any buffered writes here if we were writing
3221          * and we're trying to get hardware block position. It eats
3222          * up performance substantially, but I'm wary of drive firmware.
3223          *
3224          * I think that *logical* block position is probably okay-
3225          * but hardware block position might have to wait for data
3226          * to hit media to be valid. Caveat Emptor.
3227          */
3228
3229         if (hard && (softc->flags & SA_FLAG_TAPE_WRITTEN)) {
3230                 error = sawritefilemarks(periph, 0, 0);
3231                 if (error && error != EACCES)
3232                         return (error);
3233         }
3234
3235         ccb = cam_periph_getccb(periph, 1);
3236         scsi_read_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3237             hard, &loc, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3238         softc->dsreg = MTIO_DSREG_RBSY;
3239         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3240         softc->dsreg = MTIO_DSREG_REST;
3241         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3242                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3243
3244         if (error == 0) {
3245                 if (loc.flags & SA_RPOS_UNCERTAIN) {
3246                         error = EINVAL;         /* nothing is certain */
3247                 } else {
3248                         *blkptr = scsi_4btoul(loc.firstblk);
3249                 }
3250         }
3251
3252         xpt_release_ccb(ccb);
3253         return (error);
3254 }
3255
3256 static int
3257 sasetpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3258 {
3259         union ccb *ccb;
3260         struct sa_softc *softc;
3261         int error;
3262
3263         /*
3264          * We used to try and flush any buffered writes here.
3265          * Now we push this onto user applications to either
3266          * flush the pending writes themselves (via a zero count
3267          * WRITE FILEMARKS command) or they can trust their tape
3268          * drive to do this correctly for them.
3269          */
3270
3271         softc = (struct sa_softc *)periph->softc;
3272         ccb = cam_periph_getccb(periph, 1);
3273
3274
3275         scsi_set_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3276             hard, *blkptr, SSD_FULL_SIZE, SPACE_TIMEOUT);
3277
3278
3279         softc->dsreg = MTIO_DSREG_POS;
3280         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3281         softc->dsreg = MTIO_DSREG_REST;
3282         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3283                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3284         xpt_release_ccb(ccb);
3285         /*
3286          * Note relative file && block number position as now unknown.
3287          */
3288         softc->fileno = softc->blkno = (daddr_t) -1;
3289         return (error);
3290 }
3291
3292 static int
3293 saretension(struct cam_periph *periph)
3294 {
3295         union ccb *ccb;
3296         struct sa_softc *softc;
3297         int error;
3298
3299         softc = (struct sa_softc *)periph->softc;
3300
3301         ccb = cam_periph_getccb(periph, 1);
3302
3303         /* It is safe to retry this operation */
3304         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3305             FALSE, TRUE,  TRUE, SSD_FULL_SIZE, ERASE_TIMEOUT);
3306
3307         softc->dsreg = MTIO_DSREG_TEN;
3308         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3309         softc->dsreg = MTIO_DSREG_REST;
3310
3311         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3312                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3313         xpt_release_ccb(ccb);
3314         if (error == 0)
3315                 softc->fileno = softc->blkno = (daddr_t) 0;
3316         else
3317                 softc->fileno = softc->blkno = (daddr_t) -1;
3318         return (error);
3319 }
3320
3321 static int
3322 sareservereleaseunit(struct cam_periph *periph, int reserve)
3323 {
3324         union ccb *ccb;
3325         struct sa_softc *softc;
3326         int error;
3327
3328         softc = (struct sa_softc *)periph->softc;
3329         ccb = cam_periph_getccb(periph,  1);
3330
3331         /* It is safe to retry this operation */
3332         scsi_reserve_release_unit(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
3333             FALSE,  0, SSD_FULL_SIZE,  SCSIOP_TIMEOUT, reserve);
3334         softc->dsreg = MTIO_DSREG_RBSY;
3335         error = cam_periph_runccb(ccb, saerror, 0,
3336             SF_RETRY_UA | SF_NO_PRINT, softc->device_stats);
3337         softc->dsreg = MTIO_DSREG_REST;
3338         QFRLS(ccb);
3339         xpt_release_ccb(ccb);
3340
3341         /*
3342          * If the error was Illegal Request, then the device doesn't support
3343          * RESERVE/RELEASE. This is not an error.
3344          */
3345         if (error == EINVAL) {
3346                 error = 0;
3347         }
3348
3349         return (error);
3350 }
3351
3352 static int
3353 saloadunload(struct cam_periph *periph, int load)
3354 {
3355         union   ccb *ccb;
3356         struct  sa_softc *softc;
3357         int     error;
3358
3359         softc = (struct sa_softc *)periph->softc;
3360
3361         ccb = cam_periph_getccb(periph, 1);
3362
3363         /* It is safe to retry this operation */
3364         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3365             FALSE, FALSE, load, SSD_FULL_SIZE, REWIND_TIMEOUT);
3366
3367         softc->dsreg = (load)? MTIO_DSREG_LD : MTIO_DSREG_UNL;
3368         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3369         softc->dsreg = MTIO_DSREG_REST;
3370         QFRLS(ccb);
3371         xpt_release_ccb(ccb);
3372
3373         if (error || load == 0)
3374                 softc->fileno = softc->blkno = (daddr_t) -1;
3375         else if (error == 0)
3376                 softc->fileno = softc->blkno = (daddr_t) 0;
3377         return (error);
3378 }
3379
3380 static int
3381 saerase(struct cam_periph *periph, int longerase)
3382 {
3383
3384         union   ccb *ccb;
3385         struct  sa_softc *softc;
3386         int error;
3387
3388         softc = (struct sa_softc *)periph->softc;
3389         if (softc->open_rdonly)
3390                 return (EBADF);
3391
3392         ccb = cam_periph_getccb(periph, 1);
3393
3394         scsi_erase(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG, FALSE, longerase,
3395             SSD_FULL_SIZE, ERASE_TIMEOUT);
3396
3397         softc->dsreg = MTIO_DSREG_ZER;
3398         error = cam_periph_runccb(ccb, saerror, 0, 0, softc->device_stats);
3399         softc->dsreg = MTIO_DSREG_REST;
3400
3401         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3402                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3403         xpt_release_ccb(ccb);
3404         return (error);
3405 }
3406
3407 #endif /* _KERNEL */
3408
3409 /*
3410  * Read tape block limits command.
3411  */
3412 void
3413 scsi_read_block_limits(struct ccb_scsiio *csio, u_int32_t retries,
3414                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3415                    u_int8_t tag_action,
3416                    struct scsi_read_block_limits_data *rlimit_buf,
3417                    u_int8_t sense_len, u_int32_t timeout)
3418 {
3419         struct scsi_read_block_limits *scsi_cmd;
3420
3421         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3422              (u_int8_t *)rlimit_buf, sizeof(*rlimit_buf), sense_len,
3423              sizeof(*scsi_cmd), timeout);
3424
3425         scsi_cmd = (struct scsi_read_block_limits *)&csio->cdb_io.cdb_bytes;
3426         bzero(scsi_cmd, sizeof(*scsi_cmd));
3427         scsi_cmd->opcode = READ_BLOCK_LIMITS;
3428 }
3429
3430 void
3431 scsi_sa_read_write(struct ccb_scsiio *csio, u_int32_t retries,
3432                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3433                    u_int8_t tag_action, int readop, int sli,
3434                    int fixed, u_int32_t length, u_int8_t *data_ptr,
3435                    u_int32_t dxfer_len, u_int8_t sense_len, u_int32_t timeout)
3436 {
3437         struct scsi_sa_rw *scsi_cmd;
3438
3439         scsi_cmd = (struct scsi_sa_rw *)&csio->cdb_io.cdb_bytes;
3440         scsi_cmd->opcode = readop ? SA_READ : SA_WRITE;
3441         scsi_cmd->sli_fixed = 0;
3442         if (sli && readop)
3443                 scsi_cmd->sli_fixed |= SAR_SLI;
3444         if (fixed)
3445                 scsi_cmd->sli_fixed |= SARW_FIXED;
3446         scsi_ulto3b(length, scsi_cmd->length);
3447         scsi_cmd->control = 0;
3448
3449         cam_fill_csio(csio, retries, cbfcnp, readop ? CAM_DIR_IN : CAM_DIR_OUT,
3450             tag_action, data_ptr, dxfer_len, sense_len,
3451             sizeof(*scsi_cmd), timeout);
3452 }
3453
3454 void
3455 scsi_load_unload(struct ccb_scsiio *csio, u_int32_t retries,
3456                  void (*cbfcnp)(struct cam_periph *, union ccb *),
3457                  u_int8_t tag_action, int immediate, int eot,
3458                  int reten, int load, u_int8_t sense_len,
3459                  u_int32_t timeout)
3460 {
3461         struct scsi_load_unload *scsi_cmd;
3462
3463         scsi_cmd = (struct scsi_load_unload *)&csio->cdb_io.cdb_bytes;
3464         bzero(scsi_cmd, sizeof(*scsi_cmd));
3465         scsi_cmd->opcode = LOAD_UNLOAD;
3466         if (immediate)
3467                 scsi_cmd->immediate = SLU_IMMED;
3468         if (eot)
3469                 scsi_cmd->eot_reten_load |= SLU_EOT;
3470         if (reten)
3471                 scsi_cmd->eot_reten_load |= SLU_RETEN;
3472         if (load)
3473                 scsi_cmd->eot_reten_load |= SLU_LOAD;
3474
3475         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3476             NULL, 0, sense_len, sizeof(*scsi_cmd), timeout);
3477 }
3478
3479 void
3480 scsi_rewind(struct ccb_scsiio *csio, u_int32_t retries,
3481             void (*cbfcnp)(struct cam_periph *, union ccb *),
3482             u_int8_t tag_action, int immediate, u_int8_t sense_len,
3483             u_int32_t timeout)
3484 {
3485         struct scsi_rewind *scsi_cmd;
3486
3487         scsi_cmd = (struct scsi_rewind *)&csio->cdb_io.cdb_bytes;
3488         bzero(scsi_cmd, sizeof(*scsi_cmd));
3489         scsi_cmd->opcode = REWIND;
3490         if (immediate)
3491                 scsi_cmd->immediate = SREW_IMMED;
3492
3493         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3494             0, sense_len, sizeof(*scsi_cmd), timeout);
3495 }
3496
3497 void
3498 scsi_space(struct ccb_scsiio *csio, u_int32_t retries,
3499            void (*cbfcnp)(struct cam_periph *, union ccb *),
3500            u_int8_t tag_action, scsi_space_code code,
3501            u_int32_t count, u_int8_t sense_len, u_int32_t timeout)
3502 {
3503         struct scsi_space *scsi_cmd;
3504
3505         scsi_cmd = (struct scsi_space *)&csio->cdb_io.cdb_bytes;
3506         scsi_cmd->opcode = SPACE;
3507         scsi_cmd->code = code;
3508         scsi_ulto3b(count, scsi_cmd->count);
3509         scsi_cmd->control = 0;
3510
3511         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3512             0, sense_len, sizeof(*scsi_cmd), timeout);
3513 }
3514
3515 void
3516 scsi_write_filemarks(struct ccb_scsiio *csio, u_int32_t retries,
3517                      void (*cbfcnp)(struct cam_periph *, union ccb *),
3518                      u_int8_t tag_action, int immediate, int setmark,
3519                      u_int32_t num_marks, u_int8_t sense_len,
3520                      u_int32_t timeout)
3521 {
3522         struct scsi_write_filemarks *scsi_cmd;
3523
3524         scsi_cmd = (struct scsi_write_filemarks *)&csio->cdb_io.cdb_bytes;
3525         bzero(scsi_cmd, sizeof(*scsi_cmd));
3526         scsi_cmd->opcode = WRITE_FILEMARKS;
3527         if (immediate)
3528                 scsi_cmd->byte2 |= SWFMRK_IMMED;
3529         if (setmark)
3530                 scsi_cmd->byte2 |= SWFMRK_WSMK;
3531
3532         scsi_ulto3b(num_marks, scsi_cmd->num_marks);
3533
3534         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3535             0, sense_len, sizeof(*scsi_cmd), timeout);
3536 }
3537
3538 /*
3539  * The reserve and release unit commands differ only by their opcodes.
3540  */
3541 void
3542 scsi_reserve_release_unit(struct ccb_scsiio *csio, u_int32_t retries,
3543                           void (*cbfcnp)(struct cam_periph *, union ccb *),
3544                           u_int8_t tag_action, int third_party,
3545                           int third_party_id, u_int8_t sense_len,
3546                           u_int32_t timeout, int reserve)
3547 {
3548         struct scsi_reserve_release_unit *scsi_cmd;
3549
3550         scsi_cmd = (struct scsi_reserve_release_unit *)&csio->cdb_io.cdb_bytes;
3551         bzero(scsi_cmd, sizeof(*scsi_cmd));
3552
3553         if (reserve)
3554                 scsi_cmd->opcode = RESERVE_UNIT;
3555         else
3556                 scsi_cmd->opcode = RELEASE_UNIT;
3557
3558         if (third_party) {
3559                 scsi_cmd->lun_thirdparty |= SRRU_3RD_PARTY;
3560                 scsi_cmd->lun_thirdparty |=
3561                         ((third_party_id << SRRU_3RD_SHAMT) & SRRU_3RD_MASK);
3562         }
3563
3564         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3565             0, sense_len, sizeof(*scsi_cmd), timeout);
3566 }
3567
3568 void
3569 scsi_erase(struct ccb_scsiio *csio, u_int32_t retries,
3570            void (*cbfcnp)(struct cam_periph *, union ccb *),
3571            u_int8_t tag_action, int immediate, int long_erase,
3572            u_int8_t sense_len, u_int32_t timeout)
3573 {
3574         struct scsi_erase *scsi_cmd;
3575
3576         scsi_cmd = (struct scsi_erase *)&csio->cdb_io.cdb_bytes;
3577         bzero(scsi_cmd, sizeof(*scsi_cmd));
3578
3579         scsi_cmd->opcode = ERASE;
3580
3581         if (immediate)
3582                 scsi_cmd->lun_imm_long |= SE_IMMED;
3583
3584         if (long_erase)
3585                 scsi_cmd->lun_imm_long |= SE_LONG;
3586
3587         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3588             0, sense_len, sizeof(*scsi_cmd), timeout);
3589 }
3590
3591 /*
3592  * Read Tape Position command.
3593  */
3594 void
3595 scsi_read_position(struct ccb_scsiio *csio, u_int32_t retries,
3596                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3597                    u_int8_t tag_action, int hardsoft,
3598                    struct scsi_tape_position_data *sbp,
3599                    u_int8_t sense_len, u_int32_t timeout)
3600 {
3601         struct scsi_tape_read_position *scmd;
3602
3603         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3604             (u_int8_t *)sbp, sizeof (*sbp), sense_len, sizeof(*scmd), timeout);
3605         scmd = (struct scsi_tape_read_position *)&csio->cdb_io.cdb_bytes;
3606         bzero(scmd, sizeof(*scmd));
3607         scmd->opcode = READ_POSITION;
3608         scmd->byte1 = hardsoft;
3609 }
3610
3611 /*
3612  * Set Tape Position command.
3613  */
3614 void
3615 scsi_set_position(struct ccb_scsiio *csio, u_int32_t retries,
3616                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3617                    u_int8_t tag_action, int hardsoft, u_int32_t blkno,
3618                    u_int8_t sense_len, u_int32_t timeout)
3619 {
3620         struct scsi_tape_locate *scmd;
3621
3622         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3623             (u_int8_t *)NULL, 0, sense_len, sizeof(*scmd), timeout);
3624         scmd = (struct scsi_tape_locate *)&csio->cdb_io.cdb_bytes;
3625         bzero(scmd, sizeof(*scmd));
3626         scmd->opcode = LOCATE;
3627         if (hardsoft)
3628                 scmd->byte1 |= SA_SPOS_BT;
3629         scsi_ulto4b(blkno, scmd->blkaddr);
3630 }