sys/bus/cam/scsi/scsi_sa.c

   1 /*
   2  * $FreeBSD: src/sys/cam/scsi/scsi_sa.c,v 1.45.2.13 2002/12/17 17:08:50 trhodes Exp $
   3  * $DragonFly: src/sys/bus/cam/scsi/scsi_sa.c,v 1.33 2007/12/02 01:46:13 pavalos Exp $
   4  *
   5  * Implementation of SCSI Sequential Access Peripheral driver for CAM.
   6  *
   7  * Copyright (c) 1999, 2000 Matthew Jacob
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions, and the following disclaimer,
  15  *    without modification, immediately at the beginning of the file.
  16  * 2. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  23  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/queue.h>
  35 #ifdef _KERNEL
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #endif
  39 #include <sys/types.h>
  40 #ifdef _KERNEL
  41 #include <sys/buf.h>
  42 #include <sys/malloc.h>
  43 #endif
  44 #include <sys/mtio.h>
  45 #include <sys/conf.h>
  46 #ifdef _KERNEL
  47 #include <sys/proc.h>
  48 #include <sys/buf2.h>
  49 #include <sys/thread2.h>
  50 #endif
  51 #include <sys/fcntl.h>
  52 #include <sys/devicestat.h>
  53 #include <machine/limits.h>
  54
  55 #ifndef _KERNEL
  56 #include <stdio.h>
  57 #include <string.h>
  58 #endif
  59
  60 #include "../cam.h"
  61 #include "../cam_ccb.h"
  62 #include "../cam_extend.h"
  63 #include "../cam_periph.h"
  64 #include "../cam_xpt_periph.h"
  65 #include "../cam_debug.h"
  66
  67 #include "scsi_all.h"
  68 #include "scsi_message.h"
  69 #include "scsi_sa.h"
  70
  71 #ifdef _KERNEL
  72
  73 #include <opt_sa.h>
  74
  75 #ifndef SA_IO_TIMEOUT
  76 #define SA_IO_TIMEOUT           4
  77 #endif
  78 #ifndef SA_SPACE_TIMEOUT
  79 #define SA_SPACE_TIMEOUT        1 * 60
  80 #endif
  81 #ifndef SA_REWIND_TIMEOUT
  82 #define SA_REWIND_TIMEOUT       2 * 60
  83 #endif
  84 #ifndef SA_ERASE_TIMEOUT
  85 #define SA_ERASE_TIMEOUT        4 * 60
  86 #endif
  87
  88 #define SCSIOP_TIMEOUT          (60 * 1000)     /* not an option */
  89
  90 #define IO_TIMEOUT              (SA_IO_TIMEOUT * 60 * 1000)
  91 #define REWIND_TIMEOUT          (SA_REWIND_TIMEOUT * 60 * 1000)
  92 #define ERASE_TIMEOUT           (SA_ERASE_TIMEOUT * 60 * 1000)
  93 #define SPACE_TIMEOUT           (SA_SPACE_TIMEOUT * 60 * 1000)
  94
  95 /*
  96  * Additional options that can be set for config: SA_1FM_AT_EOT
  97  */
  98
  99 #ifndef UNUSED_PARAMETER
 100 #define UNUSED_PARAMETER(x)     x = x
 101 #endif
 102
 103 #define QFRLS(ccb)      \
 104         if (((ccb)->ccb_h.status & CAM_DEV_QFRZN) != 0) \
 105                 cam_release_devq((ccb)->ccb_h.path, 0, 0, 0, FALSE)
 106
 107 /*
 108  * Driver states
 109  */
 110
 111 MALLOC_DEFINE(M_SCSISA, "SCSI sa", "SCSI sequential access buffers");
 112
 113 typedef enum {
 114         SA_STATE_NORMAL, SA_STATE_ABNORMAL
 115 } sa_state;
 116
 117 #define ccb_pflags      ppriv_field0
 118 #define ccb_bio         ppriv_ptr1
 119
 120 #define SA_CCB_BUFFER_IO        0x0
 121 #define SA_CCB_WAITING          0x1
 122 #define SA_CCB_TYPEMASK         0x1
 123 #define SA_POSITION_UPDATED     0x2
 124
 125 #define Set_CCB_Type(x, type)                           \
 126         x->ccb_h.ccb_pflags &= ~SA_CCB_TYPEMASK;        \
 127         x->ccb_h.ccb_pflags |= type
 128
 129 #define CCB_Type(x)     (x->ccb_h.ccb_pflags & SA_CCB_TYPEMASK)
 130
 131
 132
 133 typedef enum {
 134         SA_FLAG_OPEN            = 0x0001,
 135         SA_FLAG_FIXED           = 0x0002,
 136         SA_FLAG_TAPE_LOCKED     = 0x0004,
 137         SA_FLAG_TAPE_MOUNTED    = 0x0008,
 138         SA_FLAG_TAPE_WP         = 0x0010,
 139         SA_FLAG_TAPE_WRITTEN    = 0x0020,
 140         SA_FLAG_EOM_PENDING     = 0x0040,
 141         SA_FLAG_EIO_PENDING     = 0x0080,
 142         SA_FLAG_EOF_PENDING     = 0x0100,
 143         SA_FLAG_ERR_PENDING     = (SA_FLAG_EOM_PENDING|SA_FLAG_EIO_PENDING|
 144                                    SA_FLAG_EOF_PENDING),
 145         SA_FLAG_INVALID         = 0x0200,
 146         SA_FLAG_COMP_ENABLED    = 0x0400,
 147         SA_FLAG_COMP_SUPP       = 0x0800,
 148         SA_FLAG_COMP_UNSUPP     = 0x1000,
 149         SA_FLAG_TAPE_FROZEN     = 0x2000
 150 } sa_flags;
 151
 152 typedef enum {
 153         SA_MODE_REWIND          = 0x00,
 154         SA_MODE_NOREWIND        = 0x01,
 155         SA_MODE_OFFLINE         = 0x02
 156 } sa_mode;
 157
 158 typedef enum {
 159         SA_PARAM_NONE           = 0x00,
 160         SA_PARAM_BLOCKSIZE      = 0x01,
 161         SA_PARAM_DENSITY        = 0x02,
 162         SA_PARAM_COMPRESSION    = 0x04,
 163         SA_PARAM_BUFF_MODE      = 0x08,
 164         SA_PARAM_NUMBLOCKS      = 0x10,
 165         SA_PARAM_WP             = 0x20,
 166         SA_PARAM_SPEED          = 0x40,
 167         SA_PARAM_ALL            = 0x7f
 168 } sa_params;
 169
 170 typedef enum {
 171         SA_QUIRK_NONE           = 0x00,
 172         SA_QUIRK_NOCOMP         = 0x01, /* Can't deal with compression at all */
 173         SA_QUIRK_FIXED          = 0x02, /* Force fixed mode */
 174         SA_QUIRK_VARIABLE       = 0x04, /* Force variable mode */
 175         SA_QUIRK_2FM            = 0x08, /* Needs Two File Marks at EOD */
 176         SA_QUIRK_1FM            = 0x10, /* No more than 1 File Mark at EOD */
 177         SA_QUIRK_NODREAD        = 0x20, /* Don't try and dummy read density */
 178         SA_QUIRK_NO_MODESEL     = 0x40, /* Don't do mode select at all */
 179         SA_QUIRK_NO_CPAGE       = 0x80  /* Don't use DEVICE COMPRESSION page */
 180 } sa_quirks;
 181
 182 /* units are bits 4-7, 16-21 (1024 units) */
 183 #define SAUNIT(DEV) \
 184         (((minor(DEV) & 0xF0) >> 4) |  ((minor(DEV) & 0x3f0000) >> 16))
 185
 186 #define SAMODE(z) ((minor(z) & 0x3))
 187 #define SADENSITY(z) (((minor(z) >> 2) & 0x3))
 188 #define SA_IS_CTRL(z) (minor(z) & (1 << 29))
 189
 190 #define SA_NOT_CTLDEV   0
 191 #define SA_CTLDEV       1
 192
 193 #define SA_ATYPE_R      0
 194 #define SA_ATYPE_NR     1
 195 #define SA_ATYPE_ER     2
 196
 197 #define SAMINOR(ctl, unit, mode, access) \
 198         ((ctl << 29) | ((unit & 0x3f0) << 16) | ((unit & 0xf) << 4) | \
 199         (mode << 0x2) | (access & 0x3))
 200
 201 #define SA_UNITMASK     SAMINOR(0, -1, 0, 0)
 202 #define SA_UNIT(unit)   SAMINOR(0, unit, 0, 0)
 203
 204 #define SA_NUM_MODES    4
 205
 206 struct sa_softc {
 207         sa_state        state;
 208         sa_flags        flags;
 209         sa_quirks       quirks;
 210         struct          bio_queue_head bio_queue;
 211         int             queue_count;
 212         struct          devstat device_stats;
 213         int             blk_gran;
 214         int             blk_mask;
 215         int             blk_shift;
 216         u_int32_t       max_blk;
 217         u_int32_t       min_blk;
 218         u_int32_t       comp_algorithm;
 219         u_int32_t       saved_comp_algorithm;
 220         u_int32_t       media_blksize;
 221         u_int32_t       last_media_blksize;
 222         u_int32_t       media_numblks;
 223         u_int8_t        media_density;
 224         u_int8_t        speed;
 225         u_int8_t        scsi_rev;
 226         u_int8_t        dsreg;          /* mtio mt_dsreg, redux */
 227         int             buffer_mode;
 228         int             filemarks;
 229         union           ccb saved_ccb;
 230         int             last_resid_was_io;
 231
 232         /*
 233          * Relative to BOT Location.
 234          */
 235         daddr_t         fileno;
 236         daddr_t         blkno;
 237
 238         /*
 239          * Latched Error Info
 240          */
 241         struct {
 242                 struct scsi_sense_data _last_io_sense;
 243                 u_int32_t _last_io_resid;
 244                 u_int8_t _last_io_cdb[CAM_MAX_CDBLEN];
 245                 struct scsi_sense_data _last_ctl_sense;
 246                 u_int32_t _last_ctl_resid;
 247                 u_int8_t _last_ctl_cdb[CAM_MAX_CDBLEN];
 248 #define last_io_sense   errinfo._last_io_sense
 249 #define last_io_resid   errinfo._last_io_resid
 250 #define last_io_cdb     errinfo._last_io_cdb
 251 #define last_ctl_sense  errinfo._last_ctl_sense
 252 #define last_ctl_resid  errinfo._last_ctl_resid
 253 #define last_ctl_cdb    errinfo._last_ctl_cdb
 254         } errinfo;
 255         /*
 256          * Misc other flags/state
 257          */
 258         u_int32_t
 259                                         : 29,
 260                 open_rdonly             : 1,    /* open read-only */
 261                 open_pending_mount      : 1,    /* open pending mount */
 262                 ctrl_mode               : 1;    /* control device open */
 263 };
 264
 265 struct sa_quirk_entry {
 266         struct scsi_inquiry_pattern inq_pat;    /* matching pattern */
 267         sa_quirks quirks;       /* specific quirk type */
 268         u_int32_t prefblk;      /* preferred blocksize when in fixed mode */
 269 };
 270
 271 static struct sa_quirk_entry sa_quirk_table[] =
 272 {
 273         {
 274                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "OnStream",
 275                   "ADR*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_NODREAD |
 276                    SA_QUIRK_1FM|SA_QUIRK_NO_MODESEL, 32768
 277         },
 278         {
 279                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 280                   "Python 06408*", "*"}, SA_QUIRK_NODREAD, 0
 281         },
 282         {
 283                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 284                   "Python 25601*", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_NODREAD, 0
 285         },
 286         {
 287                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 288                   "Python*", "*"}, SA_QUIRK_NODREAD, 0
 289         },
 290         {
 291                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 292                   "VIPER 150*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 293         },
 294         {
 295                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 296                   "VIPER 2525 25462", "-011"},
 297                   SA_QUIRK_NOCOMP|SA_QUIRK_1FM|SA_QUIRK_NODREAD, 0
 298         },
 299         {
 300                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
 301                   "VIPER 2525*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 302         },
 303 #if     0
 304         {
 305                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 306                   "C15*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_NO_CPAGE, 0,
 307         },
 308 #endif
 309         {
 310                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 311                   "C56*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 312         },
 313         {
 314                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 315                   "T20*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 316         },
 317         {
 318                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 319                   "T4000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 320         },
 321         {
 322                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
 323                   "HP-88780*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 324         },
 325         {
 326                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
 327                   "*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 328         },
 329         {
 330                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "M4 DATA",
 331                   "123107 SCSI*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
 332         },
 333         {       /* jreynold@primenet.com */
 334                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 335                 "STT8000N*", "*"}, SA_QUIRK_1FM, 0
 336         },
 337         {       /* mike@sentex.net */
 338                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
 339                 "STT20000*", "*"}, SA_QUIRK_1FM, 0
 340         },
 341         {
 342                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 343                   " TDC 3600", "U07:"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 344         },
 345         {
 346                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 347                   " TDC 3800", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 348         },
 349         {
 350                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 351                   " TDC 4100", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 352         },
 353         {
 354                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 355                   " TDC 4200", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
 356         },
 357         {
 358                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
 359                   " SLR*", "*"}, SA_QUIRK_1FM, 0
 360         },
 361         {
 362                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 363                   "5525ES*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
 364         },
 365         {
 366                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
 367                   "51000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
 368         }
 369 };
 370
 371 static  d_open_t        saopen;
 372 static  d_close_t       saclose;
 373 static  d_strategy_t    sastrategy;
 374 static  d_ioctl_t       saioctl;
 375 static  periph_init_t   sainit;
 376 static  periph_ctor_t   saregister;
 377 static  periph_oninv_t  saoninvalidate;
 378 static  periph_dtor_t   sacleanup;
 379 static  periph_start_t  sastart;
 380 static  void            saasync(void *callback_arg, u_int32_t code,
 381                                 struct cam_path *path, void *arg);
 382 static  void            sadone(struct cam_periph *periph,
 383                                union ccb *start_ccb);
 384 static  int             saerror(union ccb *ccb, u_int32_t cam_flags,
 385                                 u_int32_t sense_flags);
 386 static int              samarkswanted(struct cam_periph *);
 387 static int              sacheckeod(struct cam_periph *periph);
 388 static int              sagetparams(struct cam_periph *periph,
 389                                     sa_params params_to_get,
 390                                     u_int32_t *blocksize, u_int8_t *density,
 391                                     u_int32_t *numblocks, int *buff_mode,
 392                                     u_int8_t *write_protect, u_int8_t *speed,
 393                                     int *comp_supported, int *comp_enabled,
 394                                     u_int32_t *comp_algorithm,
 395                                     sa_comp_t *comp_page);
 396 static int              sasetparams(struct cam_periph *periph,
 397                                     sa_params params_to_set,
 398                                     u_int32_t blocksize, u_int8_t density,
 399                                     u_int32_t comp_algorithm,
 400                                     u_int32_t sense_flags);
 401 static void             saprevent(struct cam_periph *periph, int action);
 402 static int              sarewind(struct cam_periph *periph);
 403 static int              saspace(struct cam_periph *periph, int count,
 404                                 scsi_space_code code);
 405 static int              samount(struct cam_periph *, int, cdev_t);
 406 static int              saretension(struct cam_periph *periph);
 407 static int              sareservereleaseunit(struct cam_periph *periph,
 408                                              int reserve);
 409 static int              saloadunload(struct cam_periph *periph, int load);
 410 static int              saerase(struct cam_periph *periph, int longerase);
 411 static int              sawritefilemarks(struct cam_periph *periph,
 412                                          int nmarks, int setmarks);
 413 static int              sardpos(struct cam_periph *periph, int, u_int32_t *);
 414 static int              sasetpos(struct cam_periph *periph, int, u_int32_t *);
 415
 416
 417 static struct periph_driver sadriver =
 418 {
 419         sainit, "sa",
 420         TAILQ_HEAD_INITIALIZER(sadriver.units), /* generation */ 0
 421 };
 422
 423 PERIPHDRIVER_DECLARE(sa, sadriver);
 424
 425 /* For 2.2-stable support */
 426 #ifndef D_TAPE
 427 #define D_TAPE 0
 428 #endif
 429
 430 #define SA_CDEV_MAJOR 14
 431
 432 static struct dev_ops sa_ops = {
 433         { "sa", SA_CDEV_MAJOR, D_TAPE },
 434         .d_open =       saopen,
 435         .d_close =      saclose,
 436         .d_read =       physread,
 437         .d_write =      physwrite,
 438         .d_ioctl =      saioctl,
 439         .d_strategy =   sastrategy,
 440 };
 441
 442 static struct extend_array *saperiphs;
 443
 444 static int
 445 saopen(struct dev_open_args *ap)
 446 {
 447         cdev_t dev = ap->a_head.a_dev;
 448         struct cam_periph *periph;
 449         struct sa_softc *softc;
 450         int unit;
 451         int error;
 452
 453         unit = SAUNIT(dev);
 454
 455         crit_enter();
 456         periph = cam_extend_get(saperiphs, unit);
 457         if (periph == NULL) {
 458                 crit_exit();
 459                 return (ENXIO);
 460         }
 461         softc = (struct sa_softc *)periph->softc;
 462         if ((error = cam_periph_lock(periph, PCATCH)) != 0) {
 463                 crit_exit();
 464                 return (error);
 465         }
 466         crit_exit();
 467
 468         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 469             ("saopen(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
 470
 471         if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
 472                 cam_periph_unlock(periph);
 473                 return (ENXIO);
 474         }
 475
 476         if (SA_IS_CTRL(dev)) {
 477                 softc->ctrl_mode = 1;
 478                 cam_periph_unlock(periph);
 479                 return (0);
 480         }
 481
 482         if (softc->flags & SA_FLAG_OPEN) {
 483                 error = EBUSY;
 484         } else if (softc->flags & SA_FLAG_INVALID) {
 485                 error = ENXIO;
 486         } else {
 487                 /*
 488                  * Preserve whether this is a read_only open.
 489                  */
 490                 softc->open_rdonly = (ap->a_oflags & O_RDWR) == O_RDONLY;
 491
 492                 /*
 493                  * The function samount ensures media is loaded and ready.
 494                  * It also does a device RESERVE if the tape isn't yet mounted.
 495                  *
 496                  * If the mount fails and this was a non-blocking open,
 497                  * make this a 'open_pending_mount' action.
 498                  */
 499                 error = samount(periph, ap->a_oflags, dev);
 500                 if (error && (ap->a_oflags & O_NONBLOCK)) {
 501                         softc->flags |= SA_FLAG_OPEN;
 502                         softc->open_pending_mount = 1;
 503                         cam_periph_unlock(periph);
 504                         return (0);
 505                 }
 506         }
 507
 508         if (error) {
 509                 cam_periph_release(periph);
 510         } else {
 511                 saprevent(periph, PR_PREVENT);
 512                 softc->flags |= SA_FLAG_OPEN;
 513         }
 514         cam_periph_unlock(periph);
 515         return (error);
 516 }
 517
 518 static int
 519 saclose(struct dev_close_args *ap)
 520 {
 521         cdev_t dev = ap->a_head.a_dev;
 522         struct  cam_periph *periph;
 523         struct  sa_softc *softc;
 524         int     unit, mode, error, writing, tmp;
 525         int     closedbits = SA_FLAG_OPEN;
 526
 527         unit = SAUNIT(dev);
 528         mode = SAMODE(dev);
 529         periph = cam_extend_get(saperiphs, unit);
 530         if (periph == NULL)
 531                 return (ENXIO);
 532
 533         softc = (struct sa_softc *)periph->softc;
 534
 535         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
 536             ("saclose(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
 537
 538
 539         if ((error = cam_periph_lock(periph, 0)) != 0) {
 540                 return (error);
 541         }
 542
 543         softc->open_rdonly = 0;
 544         if (SA_IS_CTRL(dev)) {
 545                 softc->ctrl_mode = 0;
 546                 cam_periph_release(periph);
 547                 cam_periph_unlock(periph);
 548                 return (0);
 549         }
 550
 551         if (softc->open_pending_mount) {
 552                 softc->flags &= ~SA_FLAG_OPEN;
 553                 softc->open_pending_mount = 0;
 554                 cam_periph_release(periph);
 555                 cam_periph_unlock(periph);
 556                 return (0);
 557         }
 558
 559         /*
 560          * Were we writing the tape?
 561          */
 562         writing = (softc->flags & SA_FLAG_TAPE_WRITTEN) != 0;
 563
 564         /*
 565          * See whether or not we need to write filemarks. If this
 566          * fails, we probably have to assume we've lost tape
 567          * position.
 568          */
 569         error = sacheckeod(periph);
 570         if (error) {
 571                 xpt_print_path(periph->path);
 572                 kprintf("failed to write terminating filemark(s)\n");
 573                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 574         }
 575
 576         /*
 577          * Whatever we end up doing, allow users to eject tapes from here on.
 578          */
 579         saprevent(periph, PR_ALLOW);
 580
 581         /*
 582          * Decide how to end...
 583          */
 584         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
 585                 closedbits |= SA_FLAG_TAPE_FROZEN;
 586         } else switch (mode) {
 587         case SA_MODE_OFFLINE:
 588                 /*
 589                  * An 'offline' close is an unconditional release of
 590                  * frozen && mount conditions, irrespective of whether
 591                  * these operations succeeded. The reason for this is
 592                  * to allow at least some kind of programmatic way
 593                  * around our state getting all fouled up. If somebody
 594                  * issues an 'offline' command, that will be allowed
 595                  * to clear state.
 596                  */
 597                 sarewind(periph);
 598                 saloadunload(periph, FALSE);
 599                 closedbits |= SA_FLAG_TAPE_MOUNTED|SA_FLAG_TAPE_FROZEN;
 600                 break;
 601         case SA_MODE_REWIND:
 602                 /*
 603                  * If the rewind fails, return an error- if anyone cares,
 604                  * but not overwriting any previous error.
 605                  *
 606                  * We don't clear the notion of mounted here, but we do
 607                  * clear the notion of frozen if we successfully rewound.
 608                  */
 609                 tmp = sarewind(periph);
 610                 if (tmp) {
 611                         if (error != 0)
 612                                 error = tmp;
 613                 } else {
 614                         closedbits |= SA_FLAG_TAPE_FROZEN;
 615                 }
 616                 break;
 617         case SA_MODE_NOREWIND:
 618                 /*
 619                  * If we're not rewinding/unloading the tape, find out
 620                  * whether we need to back up over one of two filemarks
 621                  * we wrote (if we wrote two filemarks) so that appends
 622                  * from this point on will be sane.
 623                  */
 624                 if (error == 0 && writing && (softc->quirks & SA_QUIRK_2FM)) {
 625                         tmp = saspace(periph, -1, SS_FILEMARKS);
 626                         if (tmp) {
 627                                 xpt_print_path(periph->path);
 628                                 kprintf("unable to backspace over one of double"
 629                                    " filemarks at end of tape\n");
 630                                 xpt_print_path(periph->path);
 631                                 kprintf("it is possible that this device"
 632                                    " needs a SA_QUIRK_1FM quirk set for it\n");
 633                                 softc->flags |= SA_FLAG_TAPE_FROZEN;
 634                         }
 635                 }
 636                 break;
 637         default:
 638                 xpt_print_path(periph->path);
 639                 panic("unknown mode 0x%x in saclose", mode);
 640                 /* NOTREACHED */
 641                 break;
 642         }
 643
 644         /*
 645          * We wish to note here that there are no more filemarks to be written.
 646          */
 647         softc->filemarks = 0;
 648         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
 649
 650         /*
 651          * And we are no longer open for business.
 652          */
 653         softc->flags &= ~closedbits;
 654
 655         /*
 656          * Inform users if tape state if frozen....
 657          */
 658         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 659                 xpt_print_path(periph->path);
 660                 kprintf("tape is now frozen- use an OFFLINE, REWIND or MTEOM "
 661                     "command to clear this state.\n");
 662         }
 663
 664         /* release the device if it is no longer mounted */
 665         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0)
 666                 sareservereleaseunit(periph, FALSE);
 667
 668         cam_periph_unlock(periph);
 669         cam_periph_release(periph);
 670
 671         return (error);
 672 }
 673
 674 /*
 675  * Actually translate the requested transfer into one the physical driver
 676  * can understand.  The transfer is described by a buf and will include
 677  * only one physical transfer.
 678  */
 679 static int
 680 sastrategy(struct dev_strategy_args *ap)
 681 {
 682         cdev_t dev = ap->a_head.a_dev;
 683         struct bio *bio = ap->a_bio;
 684         struct buf *bp = bio->bio_buf;
 685         struct cam_periph *periph;
 686         struct sa_softc *softc;
 687         u_int  unit;
 688
 689         if (SA_IS_CTRL(dev)) {
 690                 bp->b_error = EINVAL;
 691                 goto bad;
 692         }
 693         unit = SAUNIT(dev);
 694         periph = cam_extend_get(saperiphs, unit);
 695         if (periph == NULL) {
 696                 bp->b_error = ENXIO;
 697                 goto bad;
 698         }
 699         softc = (struct sa_softc *)periph->softc;
 700
 701         crit_enter();
 702
 703         if (softc->flags & SA_FLAG_INVALID) {
 704                 crit_exit();
 705                 bp->b_error = ENXIO;
 706                 goto bad;
 707         }
 708
 709         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
 710                 crit_exit();
 711                 bp->b_error = EPERM;
 712                 goto bad;
 713         }
 714
 715         /*
 716          * This should actually never occur as the write(2)
 717          * system call traps attempts to write to a read-only
 718          * file descriptor.
 719          */
 720         if (bp->b_cmd == BUF_CMD_WRITE && softc->open_rdonly) {
 721                 crit_exit();
 722                 bp->b_error = EBADF;
 723                 goto bad;
 724         }
 725
 726         crit_exit();
 727
 728         if (softc->open_pending_mount) {
 729                 int error = samount(periph, 0, dev);
 730                 if (error) {
 731                         bp->b_error = ENXIO;
 732                         goto bad;
 733                 }
 734                 saprevent(periph, PR_PREVENT);
 735                 softc->open_pending_mount = 0;
 736         }
 737
 738         /*
 739          * If it's a null transfer, return immediately
 740          */
 741         if (bp->b_bcount == 0)
 742                 goto done;
 743
 744         /* valid request?  */
 745         if (softc->flags & SA_FLAG_FIXED) {
 746                 /*
 747                  * Fixed block device.  The byte count must
 748                  * be a multiple of our block size.
 749                  */
 750                 if (((softc->blk_mask != ~0) &&
 751                     ((bp->b_bcount & softc->blk_mask) != 0)) ||
 752                     ((softc->blk_mask == ~0) &&
 753                     ((bp->b_bcount % softc->min_blk) != 0))) {
 754                         xpt_print_path(periph->path);
 755                         kprintf("Invalid request.  Fixed block device "
 756                                "requests must be a multiple "
 757                                "of %d bytes\n", softc->media_blksize);
 758                         bp->b_error = EINVAL;
 759                         goto bad;
 760                 }
 761         } else if ((bp->b_bcount > softc->max_blk) ||
 762                    (bp->b_bcount < softc->min_blk) ||
 763                    (bp->b_bcount & softc->blk_mask) != 0) {
 764
 765                 xpt_print_path(periph->path);
 766                 kprintf("Invalid request.  Variable block device "
 767                     "requests must be ");
 768                 if (softc->blk_mask != 0) {
 769                         kprintf("a multiple of %d ", (0x1 << softc->blk_gran));
 770                 }
 771                 kprintf("between %d and %d bytes\n", softc->min_blk,
 772                     softc->max_blk);
 773                 bp->b_error = EINVAL;
 774                 goto bad;
 775         }
 776
 777         /*
 778          * Mask interrupts so that the device cannot be invalidated until
 779          * after we are in the queue.  Otherwise, we might not properly
 780          * clean up one of the buffers.
 781          */
 782         crit_enter();
 783
 784         /*
 785          * Place it at the end of the queue.
 786          */
 787         bioq_insert_tail(&softc->bio_queue, bio);
 788         softc->queue_count++;
 789 #if     0
 790         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
 791             ("sastrategy: queuing a %ld %s byte %s\n", bp->bio_bcount,
 792             (softc->flags & SA_FLAG_FIXED)?  "fixed" : "variable",
 793             (bp->bio_cmd == BIO_READ)? "read" : "write"));
 794 #endif
 795         if (softc->queue_count > 1) {
 796                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
 797                     ("sastrategy: queue count now %d\n", softc->queue_count));
 798         }
 799         crit_exit();
 800
 801         /*
 802          * Schedule ourselves for performing the work.
 803          */
 804         xpt_schedule(periph, 1);
 805
 806         return(0);
 807 bad:
 808         bp->b_flags |= B_ERROR;
 809 done:
 810
 811         /*
 812          * Correctly set the buf to indicate a completed xfer
 813          */
 814         bp->b_resid = bp->b_bcount;
 815         biodone(bio);
 816         return(0);
 817 }
 818
 819
 820 #define PENDING_MOUNT_CHECK(softc, periph, dev)         \
 821         if (softc->open_pending_mount) {                \
 822                 error = samount(periph, 0, dev);        \
 823                 if (error) {                            \
 824                         break;                          \
 825                 }                                       \
 826                 saprevent(periph, PR_PREVENT);          \
 827                 softc->open_pending_mount = 0;          \
 828         }
 829
 830 static int
 831 saioctl(struct dev_ioctl_args *ap)
 832 {
 833         cdev_t dev = ap->a_head.a_dev;
 834         caddr_t addr = ap->a_data;
 835         struct cam_periph *periph;
 836         struct sa_softc *softc;
 837         scsi_space_code spaceop;
 838         int didlockperiph = 0;
 839         int unit;
 840         int mode;
 841         int error = 0;
 842
 843         unit = SAUNIT(dev);
 844         mode = SAMODE(dev);
 845         error = 0;              /* shut up gcc */
 846         spaceop = 0;            /* shut up gcc */
 847
 848         periph = cam_extend_get(saperiphs, unit);
 849         if (periph == NULL)
 850                 return (ENXIO);
 851
 852         softc = (struct sa_softc *)periph->softc;
 853
 854         /*
 855          * Check for control mode accesses. We allow MTIOCGET and
 856          * MTIOCERRSTAT (but need to be the only one open in order
 857          * to clear latched status), and MTSETBSIZE, MTSETDNSTY
 858          * and MTCOMP (but need to be the only one accessing this
 859          * device to run those).
 860          */
 861
 862         if (SA_IS_CTRL(dev)) {
 863                 switch (ap->a_cmd) {
 864                 case MTIOCGETEOTMODEL:
 865                 case MTIOCGET:
 866                         break;
 867                 case MTIOCERRSTAT:
 868                         /*
 869                          * If the periph isn't already locked, lock it
 870                          * so our MTIOCERRSTAT can reset latched error stats.
 871                          *
 872                          * If the periph is already locked, skip it because
 873                          * we're just getting status and it'll be up to the
 874                          * other thread that has this device open to do
 875                          * an MTIOCERRSTAT that would clear latched status.
 876                          */
 877                         crit_enter();
 878                         if ((periph->flags & CAM_PERIPH_LOCKED) == 0) {
 879                                 error = cam_periph_lock(periph, PCATCH);
 880                                 if (error != 0) {
 881                                         crit_exit();
 882                                         return (error);
 883                                 }
 884                                 didlockperiph = 1;
 885                         }
 886                         crit_exit();
 887                         break;
 888
 889                 case MTIOCTOP:
 890                 {
 891                         struct mtop *mt = (struct mtop *) addr;
 892
 893                         /*
 894                          * Check to make sure it's an OP we can perform
 895                          * with no media inserted.
 896                          */
 897                         switch (mt->mt_op) {
 898                         case MTSETBSIZ:
 899                         case MTSETDNSTY:
 900                         case MTCOMP:
 901                                 mt = NULL;
 902                                 /* FALLTHROUGH */
 903                         default:
 904                                 break;
 905                         }
 906                         if (mt != NULL) {
 907                                 break;
 908                         }
 909                         /* FALLTHROUGH */
 910                 }
 911                 case MTIOCSETEOTMODEL:
 912                         /*
 913                          * We need to acquire the peripheral here rather
 914                          * than at open time because we are sharing writable
 915                          * access to data structures.
 916                          */
 917                         crit_enter();
 918                         error = cam_periph_lock(periph, PCATCH);
 919                         if (error != 0) {
 920                                 crit_exit();
 921                                 return (error);
 922                         }
 923                         didlockperiph = 1;
 924                         crit_exit();
 925                         break;
 926
 927                 default:
 928                         return (EINVAL);
 929                 }
 930         }
 931
 932         /*
 933          * Find the device that the user is talking about
 934          */
 935         switch (ap->a_cmd) {
 936         case MTIOCGET:
 937         {
 938                 struct mtget *g = (struct mtget *)addr;
 939
 940                 /*
 941                  * If this isn't the control mode device, actually go out
 942                  * and ask the drive again what it's set to.
 943                  */
 944                 if (!SA_IS_CTRL(dev) && !softc->open_pending_mount) {
 945                         u_int8_t write_protect;
 946                         int comp_enabled, comp_supported;
 947                         error = sagetparams(periph, SA_PARAM_ALL,
 948                             &softc->media_blksize, &softc->media_density,
 949                             &softc->media_numblks, &softc->buffer_mode,
 950                             &write_protect, &softc->speed, &comp_supported,
 951                             &comp_enabled, &softc->comp_algorithm, NULL);
 952                         if (error)
 953                                 break;
 954                         if (write_protect)
 955                                 softc->flags |= SA_FLAG_TAPE_WP;
 956                         else
 957                                 softc->flags &= ~SA_FLAG_TAPE_WP;
 958                         softc->flags &= ~(SA_FLAG_COMP_SUPP|
 959                             SA_FLAG_COMP_ENABLED|SA_FLAG_COMP_UNSUPP);
 960                         if (comp_supported) {
 961                                 if (softc->saved_comp_algorithm == 0)
 962                                         softc->saved_comp_algorithm =
 963                                             softc->comp_algorithm;
 964                                 softc->flags |= SA_FLAG_COMP_SUPP;
 965                                 if (comp_enabled)
 966                                         softc->flags |= SA_FLAG_COMP_ENABLED;
 967                         } else
 968                                 softc->flags |= SA_FLAG_COMP_UNSUPP;
 969                 }
 970                 bzero(g, sizeof(struct mtget));
 971                 g->mt_type = MT_ISAR;
 972                 if (softc->flags & SA_FLAG_COMP_UNSUPP) {
 973                         g->mt_comp = MT_COMP_UNSUPP;
 974                         g->mt_comp0 = MT_COMP_UNSUPP;
 975                         g->mt_comp1 = MT_COMP_UNSUPP;
 976                         g->mt_comp2 = MT_COMP_UNSUPP;
 977                         g->mt_comp3 = MT_COMP_UNSUPP;
 978                 } else {
 979                         if ((softc->flags & SA_FLAG_COMP_ENABLED) == 0) {
 980                                 g->mt_comp = MT_COMP_DISABLED;
 981                         } else {
 982                                 g->mt_comp = softc->comp_algorithm;
 983                         }
 984                         g->mt_comp0 = softc->comp_algorithm;
 985                         g->mt_comp1 = softc->comp_algorithm;
 986                         g->mt_comp2 = softc->comp_algorithm;
 987                         g->mt_comp3 = softc->comp_algorithm;
 988                 }
 989                 g->mt_density = softc->media_density;
 990                 g->mt_density0 = softc->media_density;
 991                 g->mt_density1 = softc->media_density;
 992                 g->mt_density2 = softc->media_density;
 993                 g->mt_density3 = softc->media_density;
 994                 g->mt_blksiz = softc->media_blksize;
 995                 g->mt_blksiz0 = softc->media_blksize;
 996                 g->mt_blksiz1 = softc->media_blksize;
 997                 g->mt_blksiz2 = softc->media_blksize;
 998                 g->mt_blksiz3 = softc->media_blksize;
 999                 g->mt_fileno = softc->fileno;
1000                 g->mt_blkno = softc->blkno;
1001                 g->mt_dsreg = (short) softc->dsreg;
1002                 /*
1003                  * Yes, we know that this is likely to overflow
1004                  */
1005                 if (softc->last_resid_was_io) {
1006                         if ((g->mt_resid = (short) softc->last_io_resid) != 0) {
1007                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
1008                                         softc->last_io_resid = 0;
1009                                 }
1010                         }
1011                 } else {
1012                         if ((g->mt_resid = (short)softc->last_ctl_resid) != 0) {
1013                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
1014                                         softc->last_ctl_resid = 0;
1015                                 }
1016                         }
1017                 }
1018                 error = 0;
1019                 break;
1020         }
1021         case MTIOCERRSTAT:
1022         {
1023                 struct scsi_tape_errors *sep =
1024                     &((union mterrstat *)addr)->scsi_errstat;
1025
1026                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
1027                     ("saioctl: MTIOCERRSTAT\n"));
1028
1029                 bzero(sep, sizeof(*sep));
1030                 sep->io_resid = softc->last_io_resid;
1031                 bcopy((caddr_t) &softc->last_io_sense, sep->io_sense,
1032                     sizeof (sep->io_sense));
1033                 bcopy((caddr_t) &softc->last_io_cdb, sep->io_cdb,
1034                     sizeof (sep->io_cdb));
1035                 sep->ctl_resid = softc->last_ctl_resid;
1036                 bcopy((caddr_t) &softc->last_ctl_sense, sep->ctl_sense,
1037                     sizeof (sep->ctl_sense));
1038                 bcopy((caddr_t) &softc->last_ctl_cdb, sep->ctl_cdb,
1039                     sizeof (sep->ctl_cdb));
1040
1041                 if ((SA_IS_CTRL(dev) == 0 && softc->open_pending_mount) ||
1042                     didlockperiph)
1043                         bzero((caddr_t) &softc->errinfo,
1044                             sizeof (softc->errinfo));
1045                 error = 0;
1046                 break;
1047         }
1048         case MTIOCTOP:
1049         {
1050                 struct mtop *mt;
1051                 int    count;
1052
1053                 PENDING_MOUNT_CHECK(softc, periph, dev);
1054
1055                 mt = (struct mtop *)addr;
1056
1057                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
1058                          ("saioctl: op=0x%x count=0x%x\n",
1059                           mt->mt_op, mt->mt_count));
1060
1061                 count = mt->mt_count;
1062                 switch (mt->mt_op) {
1063                 case MTWEOF:    /* write an end-of-file marker */
1064                         /*
1065                          * We don't need to clear the SA_FLAG_TAPE_WRITTEN
1066                          * flag because by keeping track of filemarks
1067                          * we have last written we know ehether or not
1068                          * we need to write more when we close the device.
1069                          */
1070                         error = sawritefilemarks(periph, count, FALSE);
1071                         break;
1072                 case MTWSS:     /* write a setmark */
1073                         error = sawritefilemarks(periph, count, TRUE);
1074                         break;
1075                 case MTBSR:     /* backward space record */
1076                 case MTFSR:     /* forward space record */
1077                 case MTBSF:     /* backward space file */
1078                 case MTFSF:     /* forward space file */
1079                 case MTBSS:     /* backward space setmark */
1080                 case MTFSS:     /* forward space setmark */
1081                 case MTEOD:     /* space to end of recorded medium */
1082                 {
1083                         int nmarks;
1084
1085                         spaceop = SS_FILEMARKS;
1086                         nmarks = softc->filemarks;
1087                         error = sacheckeod(periph);
1088                         if (error) {
1089                                 xpt_print_path(periph->path);
1090                                 kprintf("EOD check prior to spacing failed\n");
1091                                 softc->flags |= SA_FLAG_EIO_PENDING;
1092                                 break;
1093                         }
1094                         nmarks -= softc->filemarks;
1095                         switch(mt->mt_op) {
1096                         case MTBSR:
1097                                 count = -count;
1098                                 /* FALLTHROUGH */
1099                         case MTFSR:
1100                                 spaceop = SS_BLOCKS;
1101                                 break;
1102                         case MTBSF:
1103                                 count = -count;
1104                                 /* FALLTHROUGH */
1105                         case MTFSF:
1106                                 break;
1107                         case MTBSS:
1108                                 count = -count;
1109                                 /* FALLTHROUGH */
1110                         case MTFSS:
1111                                 spaceop = SS_SETMARKS;
1112                                 break;
1113                         case MTEOD:
1114                                 spaceop = SS_EOD;
1115                                 count = 0;
1116                                 nmarks = 0;
1117                                 break;
1118                         default:
1119                                 error = EINVAL;
1120                                 break;
1121                         }
1122                         if (error)
1123                                 break;
1124
1125                         nmarks = softc->filemarks;
1126                         /*
1127                          * XXX: Why are we checking again?
1128                          */
1129                         error = sacheckeod(periph);
1130                         if (error)
1131                                 break;
1132                         nmarks -= softc->filemarks;
1133                         error = saspace(periph, count - nmarks, spaceop);
1134                         /*
1135                          * At this point, clear that we've written the tape
1136                          * and that we've written any filemarks. We really
1137                          * don't know what the applications wishes to do next-
1138                          * the sacheckeod's will make sure we terminated the
1139                          * tape correctly if we'd been writing, but the next
1140                          * action the user application takes will set again
1141                          * whether we need to write filemarks.
1142                          */
1143                         softc->flags &=
1144                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1145                         softc->filemarks = 0;
1146                         break;
1147                 }
1148                 case MTREW:     /* rewind */
1149                         PENDING_MOUNT_CHECK(softc, periph, dev);
1150                         sacheckeod(periph);
1151                         error = sarewind(periph);
1152                         /* see above */
1153                         softc->flags &=
1154                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1155                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1156                         softc->filemarks = 0;
1157                         break;
1158                 case MTERASE:   /* erase */
1159                         PENDING_MOUNT_CHECK(softc, periph, dev);
1160                         error = saerase(periph, count);
1161                         softc->flags &=
1162                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1163                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1164                         break;
1165                 case MTRETENS:  /* re-tension tape */
1166                         PENDING_MOUNT_CHECK(softc, periph, dev);
1167                         error = saretension(periph);
1168                         softc->flags &=
1169                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1170                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1171                         break;
1172                 case MTOFFL:    /* rewind and put the drive offline */
1173
1174                         PENDING_MOUNT_CHECK(softc, periph, dev);
1175
1176                         sacheckeod(periph);
1177                         /* see above */
1178                         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
1179                         softc->filemarks = 0;
1180
1181                         error = sarewind(periph);
1182                         /* clear the frozen flag anyway */
1183                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1184
1185                         /*
1186                          * Be sure to allow media removal before ejecting.
1187                          */
1188
1189                         saprevent(periph, PR_ALLOW);
1190                         if (error == 0) {
1191                                 error = saloadunload(periph, FALSE);
1192                                 if (error == 0) {
1193                                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1194                                 }
1195                         }
1196                         break;
1197
1198                 case MTNOP:     /* no operation, sets status only */
1199                 case MTCACHE:   /* enable controller cache */
1200                 case MTNOCACHE: /* disable controller cache */
1201                         error = 0;
1202                         break;
1203
1204                 case MTSETBSIZ: /* Set block size for device */
1205
1206                         PENDING_MOUNT_CHECK(softc, periph, dev);
1207
1208                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE, count,
1209                                             0, 0, 0);
1210                         if (error == 0) {
1211                                 softc->last_media_blksize =
1212                                     softc->media_blksize;
1213                                 softc->media_blksize = count;
1214                                 if (count) {
1215                                         softc->flags |= SA_FLAG_FIXED;
1216                                         if (powerof2(count)) {
1217                                                 softc->blk_shift =
1218                                                     ffs(count) - 1;
1219                                                 softc->blk_mask = count - 1;
1220                                         } else {
1221                                                 softc->blk_mask = ~0;
1222                                                 softc->blk_shift = 0;
1223                                         }
1224                                         /*
1225                                          * Make the user's desire 'persistent'.
1226                                          */
1227                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
1228                                         softc->quirks |= SA_QUIRK_FIXED;
1229                                 } else {
1230                                         softc->flags &= ~SA_FLAG_FIXED;
1231                                         if (softc->max_blk == 0) {
1232                                                 softc->max_blk = ~0;
1233                                         }
1234                                         softc->blk_shift = 0;
1235                                         if (softc->blk_gran != 0) {
1236                                                 softc->blk_mask =
1237                                                     softc->blk_gran - 1;
1238                                         } else {
1239                                                 softc->blk_mask = 0;
1240                                         }
1241                                         /*
1242                                          * Make the user's desire 'persistent'.
1243                                          */
1244                                         softc->quirks |= SA_QUIRK_VARIABLE;
1245                                         softc->quirks &= ~SA_QUIRK_FIXED;
1246                                 }
1247                         }
1248                         break;
1249                 case MTSETDNSTY:        /* Set density for device and mode */
1250                         PENDING_MOUNT_CHECK(softc, periph, dev);
1251
1252                         if (count > UCHAR_MAX) {
1253                                 error = EINVAL;
1254                                 break;
1255                         } else {
1256                                 error = sasetparams(periph, SA_PARAM_DENSITY,
1257                                                     0, count, 0, 0);
1258                         }
1259                         break;
1260                 case MTCOMP:    /* enable compression */
1261                         PENDING_MOUNT_CHECK(softc, periph, dev);
1262                         /*
1263                          * Some devices don't support compression, and
1264                          * don't like it if you ask them for the
1265                          * compression page.
1266                          */
1267                         if ((softc->quirks & SA_QUIRK_NOCOMP) ||
1268                             (softc->flags & SA_FLAG_COMP_UNSUPP)) {
1269                                 error = ENODEV;
1270                                 break;
1271                         }
1272                         error = sasetparams(periph, SA_PARAM_COMPRESSION,
1273                             0, 0, count, SF_NO_PRINT);
1274                         break;
1275                 default:
1276                         error = EINVAL;
1277                 }
1278                 break;
1279         }
1280         case MTIOCIEOT:
1281         case MTIOCEEOT:
1282                 error = 0;
1283                 break;
1284         case MTIOCRDSPOS:
1285                 PENDING_MOUNT_CHECK(softc, periph, dev);
1286                 error = sardpos(periph, 0, (u_int32_t *) addr);
1287                 break;
1288         case MTIOCRDHPOS:
1289                 PENDING_MOUNT_CHECK(softc, periph, dev);
1290                 error = sardpos(periph, 1, (u_int32_t *) addr);
1291                 break;
1292         case MTIOCSLOCATE:
1293                 PENDING_MOUNT_CHECK(softc, periph, dev);
1294                 error = sasetpos(periph, 0, (u_int32_t *) addr);
1295                 break;
1296         case MTIOCHLOCATE:
1297                 PENDING_MOUNT_CHECK(softc, periph, dev);
1298                 error = sasetpos(periph, 1, (u_int32_t *) addr);
1299                 break;
1300         case MTIOCGETEOTMODEL:
1301                 error = 0;
1302                 if (softc->quirks & SA_QUIRK_1FM)
1303                         mode = 1;
1304                 else
1305                         mode = 2;
1306                 *((u_int32_t *) addr) = mode;
1307                 break;
1308         case MTIOCSETEOTMODEL:
1309                 error = 0;
1310                 switch (*((u_int32_t *) addr)) {
1311                 case 1:
1312                         softc->quirks &= ~SA_QUIRK_2FM;
1313                         softc->quirks |= SA_QUIRK_1FM;
1314                         break;
1315                 case 2:
1316                         softc->quirks &= ~SA_QUIRK_1FM;
1317                         softc->quirks |= SA_QUIRK_2FM;
1318                         break;
1319                 default:
1320                         error = EINVAL;
1321                         break;
1322                 }
1323                 break;
1324         default:
1325                 error = cam_periph_ioctl(periph, ap->a_cmd, addr, saerror);
1326                 break;
1327         }
1328
1329         /*
1330          * Check to see if we cleared a frozen state
1331          */
1332         if (error == 0 && (softc->flags & SA_FLAG_TAPE_FROZEN)) {
1333                 switch(ap->a_cmd) {
1334                 case MTIOCRDSPOS:
1335                 case MTIOCRDHPOS:
1336                 case MTIOCSLOCATE:
1337                 case MTIOCHLOCATE:
1338                         softc->fileno = (daddr_t) -1;
1339                         softc->blkno = (daddr_t) -1;
1340                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1341                         xpt_print_path(periph->path);
1342                         kprintf("tape state now unfrozen.\n");
1343                         break;
1344                 default:
1345                         break;
1346                 }
1347         }
1348         if (didlockperiph) {
1349                 cam_periph_unlock(periph);
1350         }
1351         return (error);
1352 }
1353
1354 static void
1355 sainit(void)
1356 {
1357         cam_status status;
1358         struct cam_path *path;
1359
1360         /*
1361          * Create our extend array for storing the devices we attach to.
1362          */
1363         saperiphs = cam_extend_new();
1364         if (saperiphs == NULL) {
1365                 kprintf("sa: Failed to alloc extend array!\n");
1366                 return;
1367         }
1368
1369         /*
1370          * Install a global async callback.
1371          */
1372         status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1373                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
1374
1375         if (status == CAM_REQ_CMP) {
1376                 /* Register the async callbacks of interrest */
1377                 struct ccb_setasync csa; /*
1378                                           * This is an immediate CCB,
1379                                           * so using the stack is OK
1380                                           */
1381                 xpt_setup_ccb(&csa.ccb_h, path, 5);
1382                 csa.ccb_h.func_code = XPT_SASYNC_CB;
1383                 csa.event_enable = AC_FOUND_DEVICE;
1384                 csa.callback = saasync;
1385                 csa.callback_arg = NULL;
1386                 xpt_action((union ccb *)&csa);
1387                 status = csa.ccb_h.status;
1388                 xpt_free_path(path);
1389         }
1390
1391         if (status != CAM_REQ_CMP) {
1392                 kprintf("sa: Failed to attach master async callback "
1393                        "due to status 0x%x!\n", status);
1394         }
1395 }
1396
1397 static void
1398 saoninvalidate(struct cam_periph *periph)
1399 {
1400         struct sa_softc *softc;
1401         struct buf *q_bp;
1402         struct bio *q_bio;
1403         struct ccb_setasync csa;
1404
1405         softc = (struct sa_softc *)periph->softc;
1406
1407         /*
1408          * De-register any async callbacks.
1409          */
1410         xpt_setup_ccb(&csa.ccb_h, periph->path,
1411                       /* priority */ 5);
1412         csa.ccb_h.func_code = XPT_SASYNC_CB;
1413         csa.event_enable = 0;
1414         csa.callback = saasync;
1415         csa.callback_arg = periph;
1416         xpt_action((union ccb *)&csa);
1417
1418         softc->flags |= SA_FLAG_INVALID;
1419
1420         /*
1421          * We need to be in a critical section here to keep the buffer
1422          * queue from being modified while we traverse it.
1423          */
1424         crit_enter();
1425
1426         /*
1427          * Return all queued I/O with ENXIO.
1428          * XXX Handle any transactions queued to the card
1429          *     with XPT_ABORT_CCB.
1430          */
1431         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL){
1432                 bioq_remove(&softc->bio_queue, q_bio);
1433                 q_bp = q_bio->bio_buf;
1434                 q_bp->b_resid = q_bp->b_bcount;
1435                 q_bp->b_error = ENXIO;
1436                 q_bp->b_flags |= B_ERROR;
1437                 biodone(q_bio);
1438         }
1439         softc->queue_count = 0;
1440         crit_exit();
1441
1442         xpt_print_path(periph->path);
1443         kprintf("lost device\n");
1444
1445 }
1446
1447 static void
1448 sacleanup(struct cam_periph *periph)
1449 {
1450         struct sa_softc *softc;
1451
1452         softc = (struct sa_softc *)periph->softc;
1453
1454         devstat_remove_entry(&softc->device_stats);
1455
1456         cam_extend_release(saperiphs, periph->unit_number);
1457         xpt_print_path(periph->path);
1458         kprintf("removing device entry\n");
1459         dev_ops_remove(&sa_ops, SA_UNITMASK, SA_UNIT(periph->unit_number));
1460         kfree(softc, M_SCSISA);
1461 }
1462
1463 static void
1464 saasync(void *callback_arg, u_int32_t code,
1465         struct cam_path *path, void *arg)
1466 {
1467         struct cam_periph *periph;
1468
1469         periph = (struct cam_periph *)callback_arg;
1470         switch (code) {
1471         case AC_FOUND_DEVICE:
1472         {
1473                 struct ccb_getdev *cgd;
1474                 cam_status status;
1475
1476                 cgd = (struct ccb_getdev *)arg;
1477                 if (cgd == NULL)
1478                         break;
1479
1480                 if (SID_TYPE(&cgd->inq_data) != T_SEQUENTIAL)
1481                         break;
1482
1483                 /*
1484                  * Allocate a peripheral instance for
1485                  * this device and start the probe
1486                  * process.
1487                  */
1488                 status = cam_periph_alloc(saregister, saoninvalidate,
1489                                           sacleanup, sastart,
1490                                           "sa", CAM_PERIPH_BIO, cgd->ccb_h.path,
1491                                           saasync, AC_FOUND_DEVICE, cgd);
1492
1493                 if (status != CAM_REQ_CMP
1494                  && status != CAM_REQ_INPROG)
1495                         kprintf("saasync: Unable to probe new device "
1496                                 "due to status 0x%x\n", status);
1497                 break;
1498         }
1499         default:
1500                 cam_periph_async(periph, code, path, arg);
1501                 break;
1502         }
1503 }
1504
1505 static cam_status
1506 saregister(struct cam_periph *periph, void *arg)
1507 {
1508         struct sa_softc *softc;
1509         struct ccb_setasync csa;
1510         struct ccb_getdev *cgd;
1511         caddr_t match;
1512         int i;
1513
1514         cgd = (struct ccb_getdev *)arg;
1515         if (periph == NULL) {
1516                 kprintf("saregister: periph was NULL!!\n");
1517                 return (CAM_REQ_CMP_ERR);
1518         }
1519
1520         if (cgd == NULL) {
1521                 kprintf("saregister: no getdev CCB, can't register device\n");
1522                 return (CAM_REQ_CMP_ERR);
1523         }
1524
1525         softc = kmalloc(sizeof (*softc), M_SCSISA, M_INTWAIT | M_ZERO);
1526         softc->scsi_rev = SID_ANSI_REV(&cgd->inq_data);
1527         softc->state = SA_STATE_NORMAL;
1528         softc->fileno = (daddr_t) -1;
1529         softc->blkno = (daddr_t) -1;
1530
1531         bioq_init(&softc->bio_queue);
1532         periph->softc = softc;
1533         cam_extend_set(saperiphs, periph->unit_number, periph);
1534
1535         /*
1536          * See if this device has any quirks.
1537          */
1538         match = cam_quirkmatch((caddr_t)&cgd->inq_data,
1539                                (caddr_t)sa_quirk_table,
1540                                sizeof(sa_quirk_table)/sizeof(*sa_quirk_table),
1541                                sizeof(*sa_quirk_table), scsi_inquiry_match);
1542
1543         if (match != NULL) {
1544                 softc->quirks = ((struct sa_quirk_entry *)match)->quirks;
1545                 softc->last_media_blksize =
1546                     ((struct sa_quirk_entry *)match)->prefblk;
1547 #ifdef  CAMDEBUG
1548                 xpt_print_path(periph->path);
1549                 kprintf("found quirk entry %d\n", (int)
1550                     (((struct sa_quirk_entry *) match) - sa_quirk_table));
1551 #endif
1552         } else
1553                 softc->quirks = SA_QUIRK_NONE;
1554
1555         /*
1556          * The SA driver supports a blocksize, but we don't know the
1557          * blocksize until we media is inserted.  So, set a flag to
1558          * indicate that the blocksize is unavailable right now.
1559          */
1560         devstat_add_entry(&softc->device_stats, "sa", periph->unit_number, 0,
1561             DEVSTAT_BS_UNAVAILABLE, SID_TYPE(&cgd->inq_data) |
1562             DEVSTAT_TYPE_IF_SCSI, DEVSTAT_PRIORITY_TAPE);
1563
1564         dev_ops_add(&sa_ops, SA_UNITMASK, SA_UNIT(periph->unit_number));
1565         make_dev(&sa_ops, SAMINOR(SA_CTLDEV,
1566             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1567             0660, "%s%d.ctl", periph->periph_name, periph->unit_number);
1568
1569         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1570             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1571             0660, "%s%d", periph->periph_name, periph->unit_number);
1572
1573         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1574             periph->unit_number, 0, SA_ATYPE_NR), UID_ROOT, GID_OPERATOR,
1575             0660, "n%s%d", periph->periph_name, periph->unit_number);
1576
1577         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1578             periph->unit_number, 0, SA_ATYPE_ER), UID_ROOT, GID_OPERATOR,
1579             0660, "e%s%d", periph->periph_name, periph->unit_number);
1580
1581         for (i = 0; i < SA_NUM_MODES; i++) {
1582
1583                 make_dev(&sa_ops,
1584                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_R),
1585                     UID_ROOT, GID_OPERATOR, 0660, "%s%d.%d",
1586                     periph->periph_name, periph->unit_number, i);
1587
1588                 make_dev(&sa_ops,
1589                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_NR),
1590                     UID_ROOT, GID_OPERATOR, 0660, "n%s%d.%d",
1591                     periph->periph_name, periph->unit_number, i);
1592
1593
1594                 make_dev(&sa_ops,
1595                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_ER),
1596                     UID_ROOT, GID_OPERATOR, 0660, "e%s%d.%d",
1597                     periph->periph_name, periph->unit_number, i);
1598         }
1599
1600         /*
1601          * Add an async callback so that we get
1602          * notified if this device goes away.
1603          */
1604         xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5);
1605         csa.ccb_h.func_code = XPT_SASYNC_CB;
1606         csa.event_enable = AC_LOST_DEVICE;
1607         csa.callback = saasync;
1608         csa.callback_arg = periph;
1609         xpt_action((union ccb *)&csa);
1610
1611         xpt_announce_periph(periph, NULL);
1612
1613         return (CAM_REQ_CMP);
1614 }
1615
1616 static void
1617 sastart(struct cam_periph *periph, union ccb *start_ccb)
1618 {
1619         struct sa_softc *softc;
1620
1621         softc = (struct sa_softc *)periph->softc;
1622
1623         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("sastart\n"));
1624
1625
1626         switch (softc->state) {
1627         case SA_STATE_NORMAL:
1628         {
1629                 /* Pull a buffer from the queue and get going on it */
1630                 struct buf *bp;
1631                 struct bio *bio;
1632
1633                 /*
1634                  * See if there is a buf with work for us to do..
1635                  */
1636                 crit_enter();
1637                 bio = bioq_first(&softc->bio_queue);
1638                 if (periph->immediate_priority <= periph->pinfo.priority) {
1639                         CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
1640                                         ("queuing for immediate ccb\n"));
1641                         Set_CCB_Type(start_ccb, SA_CCB_WAITING);
1642                         SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
1643                                           periph_links.sle);
1644                         periph->immediate_priority = CAM_PRIORITY_NONE;
1645                         crit_exit();
1646                         wakeup(&periph->ccb_list);
1647                 } else if (bio == NULL) {
1648                         crit_exit();
1649                         xpt_release_ccb(start_ccb);
1650                 } else if ((softc->flags & SA_FLAG_ERR_PENDING) != 0) {
1651                         struct bio *done_bio;
1652 again:
1653                         softc->queue_count--;
1654                         bioq_remove(&softc->bio_queue, bio);
1655                         bp = bio->bio_buf;
1656                         bp->b_resid = bp->b_bcount;
1657                         done_bio = bio;
1658                         if ((softc->flags & SA_FLAG_EOM_PENDING) != 0) {
1659                                 /*
1660                                  * We now just clear errors in this case
1661                                  * and let the residual be the notifier.
1662                                  */
1663                                 bp->b_error = 0;
1664                         } else if ((softc->flags & SA_FLAG_EOF_PENDING) != 0) {
1665                                 /*
1666                                  * This can only happen if we're reading
1667                                  * in fixed length mode. In this case,
1668                                  * we dump the rest of the list the
1669                                  * same way.
1670                                  */
1671                                 bp->b_error = 0;
1672                                 if (bioq_first(&softc->bio_queue) != NULL) {
1673                                         biodone(done_bio);
1674                                         goto again;
1675                                 }
1676                         } else if ((softc->flags & SA_FLAG_EIO_PENDING) != 0) {
1677                                 bp->b_error = EIO;
1678                                 bp->b_flags |= B_ERROR;
1679                         }
1680                         bio = bioq_first(&softc->bio_queue);
1681                         /*
1682                          * Only if we have no other buffers queued up
1683                          * do we clear the pending error flag.
1684                          */
1685                         if (bio == NULL)
1686                                 softc->flags &= ~SA_FLAG_ERR_PENDING;
1687                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1688                             ("sastart- ERR_PENDING now 0x%x, bio is %sNULL, "
1689                             "%d more buffers queued up\n",
1690                             (softc->flags & SA_FLAG_ERR_PENDING),
1691                             (bio != NULL)? "not " : " ", softc->queue_count));
1692                         crit_exit();
1693                         xpt_release_ccb(start_ccb);
1694                         biodone(done_bio);
1695                 } else {
1696                         u_int32_t length;
1697
1698                         bioq_remove(&softc->bio_queue, bio);
1699                         bp = bio->bio_buf;
1700                         softc->queue_count--;
1701
1702                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
1703                                 if (softc->blk_shift != 0) {
1704                                         length =
1705                                             bp->b_bcount >> softc->blk_shift;
1706                                 } else if (softc->media_blksize != 0) {
1707                                         length =
1708                                             bp->b_bcount / softc->media_blksize;
1709                                 } else {
1710                                         bp->b_error = EIO;
1711                                         xpt_print_path(periph->path);
1712                                         kprintf("zero blocksize for "
1713                                             "FIXED length writes?\n");
1714                                         crit_exit();
1715                                         biodone(bio);
1716                                         break;
1717                                 }
1718 #if     0
1719                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1720                                     ("issuing a %d fixed record %s\n",
1721                                     length,  (bp->bio_cmd == BIO_READ)? "read" :
1722                                     "write"));
1723 #endif
1724                         } else {
1725                                 length = bp->b_bcount;
1726 #if     0
1727                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1728                                     ("issuing a %d variable byte %s\n",
1729                                     length,  (bp->bio_cmd == BIO_READ)? "read" :
1730                                     "write"));
1731 #endif
1732                         }
1733                         devstat_start_transaction(&softc->device_stats);
1734                         /*
1735                          * Some people have theorized that we should
1736                          * suppress illegal length indication if we are
1737                          * running in variable block mode so that we don't
1738                          * have to request sense every time our requested
1739                          * block size is larger than the written block.
1740                          * The residual information from the ccb allows
1741                          * us to identify this situation anyway.  The only
1742                          * problem with this is that we will not get
1743                          * information about blocks that are larger than
1744                          * our read buffer unless we set the block size
1745                          * in the mode page to something other than 0.
1746                          *
1747                          * I believe that this is a non-issue. If user apps
1748                          * don't adjust their read size to match our record
1749                          * size, that's just life. Anyway, the typical usage
1750                          * would be to issue, e.g., 64KB reads and occasionally
1751                          * have to do deal with 512 byte or 1KB intermediate
1752                          * records.
1753                          */
1754                         softc->dsreg = (bp->b_cmd == BUF_CMD_READ) ?
1755                             MTIO_DSREG_RD : MTIO_DSREG_WR;
1756                         scsi_sa_read_write(&start_ccb->csio, 0, sadone,
1757                             MSG_SIMPLE_Q_TAG, (bp->b_cmd == BUF_CMD_READ) != 0,
1758                             FALSE, (softc->flags & SA_FLAG_FIXED) != 0,
1759                             length, bp->b_data, bp->b_bcount, SSD_FULL_SIZE,
1760                             IO_TIMEOUT);
1761                         start_ccb->ccb_h.ccb_pflags &= ~SA_POSITION_UPDATED;
1762                         Set_CCB_Type(start_ccb, SA_CCB_BUFFER_IO);
1763                         start_ccb->ccb_h.ccb_bio = bio;
1764                         bio = bioq_first(&softc->bio_queue);
1765                         crit_exit();
1766                         xpt_action(start_ccb);
1767                 }
1768
1769                 if (bio != NULL) {
1770                         /* Have more work to do, so ensure we stay scheduled */
1771                         xpt_schedule(periph, 1);
1772                 }
1773                 break;
1774         }
1775         case SA_STATE_ABNORMAL:
1776         default:
1777                 panic("state 0x%x in sastart", softc->state);
1778                 break;
1779         }
1780 }
1781
1782
1783 static void
1784 sadone(struct cam_periph *periph, union ccb *done_ccb)
1785 {
1786         struct sa_softc *softc;
1787         struct ccb_scsiio *csio;
1788
1789         softc = (struct sa_softc *)periph->softc;
1790         csio = &done_ccb->csio;
1791         switch (CCB_Type(csio)) {
1792         case SA_CCB_BUFFER_IO:
1793         {
1794                 struct buf *bp;
1795                 struct bio *bio;
1796                 int error;
1797
1798                 softc->dsreg = MTIO_DSREG_REST;
1799                 bio = (struct bio *)done_ccb->ccb_h.ccb_bio;
1800                 bp = bio->bio_buf;
1801                 error = 0;
1802                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1803                         if ((error = saerror(done_ccb, 0, 0)) == ERESTART) {
1804                                 /*
1805                                  * A retry was scheduled, so just return.
1806                                  */
1807                                 return;
1808                         }
1809                 }
1810
1811                 if (error == EIO) {
1812                         struct buf *q_bp;
1813                         struct bio *q_bio;
1814
1815                         /*
1816                          * Catastrophic error. Mark the tape as frozen
1817                          * (we no longer know tape position).
1818                          *
1819                          * Return all queued I/O with EIO, and unfreeze
1820                          * our queue so that future transactions that
1821                          * attempt to fix this problem can get to the
1822                          * device.
1823                          *
1824                          */
1825
1826                         crit_enter();
1827                         softc->flags |= SA_FLAG_TAPE_FROZEN;
1828                         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL) {
1829                                 bioq_remove(&softc->bio_queue, q_bio);
1830                                 q_bp = q_bio->bio_buf;
1831                                 q_bp->b_resid = q_bp->b_bcount;
1832                                 q_bp->b_error = EIO;
1833                                 q_bp->b_flags |= B_ERROR;
1834                                 biodone(q_bio);
1835                         }
1836                         crit_exit();
1837                 }
1838                 if (error != 0) {
1839                         bp->b_resid = bp->b_bcount;
1840                         bp->b_error = error;
1841                         bp->b_flags |= B_ERROR;
1842                         /*
1843                          * In the error case, position is updated in saerror.
1844                          */
1845                 } else {
1846                         bp->b_resid = csio->resid;
1847                         bp->b_error = 0;
1848                         if (csio->resid != 0) {
1849                                 bp->b_flags |= B_ERROR;
1850                         }
1851                         if (bp->b_cmd != BUF_CMD_READ) {
1852                                 softc->flags |= SA_FLAG_TAPE_WRITTEN;
1853                                 softc->filemarks = 0;
1854                         }
1855                         if (!(csio->ccb_h.ccb_pflags & SA_POSITION_UPDATED) &&
1856                             (softc->blkno != (daddr_t) -1)) {
1857                                 if ((softc->flags & SA_FLAG_FIXED) != 0) {
1858                                         u_int32_t l;
1859                                         if (softc->blk_shift != 0) {
1860                                                 l = bp->b_bcount >>
1861                                                         softc->blk_shift;
1862                                         } else {
1863                                                 l = bp->b_bcount /
1864                                                         softc->media_blksize;
1865                                         }
1866                                         softc->blkno += (daddr_t) l;
1867                                 } else {
1868                                         softc->blkno++;
1869                                 }
1870                         }
1871                 }
1872                 /*
1873                  * If we had an error (immediate or pending),
1874                  * release the device queue now.
1875                  */
1876                 if (error || (softc->flags & SA_FLAG_ERR_PENDING))
1877                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1878 #ifdef  CAMDEBUG
1879                 if (error || bp->b_resid) {
1880                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1881                                   ("error %d resid %d count %d\n", error,
1882                                   bp->b_resid, bp->b_bcount));
1883                 }
1884 #endif
1885                 devstat_end_transaction_buf(&softc->device_stats, bp);
1886                 biodone(bio);
1887                 break;
1888         }
1889         case SA_CCB_WAITING:
1890         {
1891                 /* Caller will release the CCB */
1892                 wakeup(&done_ccb->ccb_h.cbfcnp);
1893                 return;
1894         }
1895         }
1896         xpt_release_ccb(done_ccb);
1897 }
1898
1899 /*
1900  * Mount the tape (make sure it's ready for I/O).
1901  */
1902 static int
1903 samount(struct cam_periph *periph, int oflags, cdev_t dev)
1904 {
1905         struct  sa_softc *softc;
1906         union   ccb *ccb;
1907         int     error;
1908
1909         /*
1910          * oflags can be checked for 'kind' of open (read-only check) - later
1911          * dev can be checked for a control-mode or compression open - later
1912          */
1913         UNUSED_PARAMETER(oflags);
1914         UNUSED_PARAMETER(dev);
1915
1916
1917         softc = (struct sa_softc *)periph->softc;
1918
1919         /*
1920          * This should determine if something has happend since the last
1921          * open/mount that would invalidate the mount. We do *not* want
1922          * to retry this command- we just want the status. But we only
1923          * do this if we're mounted already- if we're not mounted,
1924          * we don't care about the unit read state and can instead use
1925          * this opportunity to attempt to reserve the tape unit.
1926          */
1927
1928         if (softc->flags & SA_FLAG_TAPE_MOUNTED) {
1929                 ccb = cam_periph_getccb(periph, 1);
1930                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1931                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1932                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1933                     &softc->device_stats);
1934                 QFRLS(ccb);
1935                 if (error == ENXIO) {
1936                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1937                         scsi_test_unit_ready(&ccb->csio, 0, sadone,
1938                             MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1939                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1940                             &softc->device_stats);
1941                         QFRLS(ccb);
1942                 } else if (error) {
1943                         /*
1944                          * We don't need to freeze the tape because we
1945                          * will now attempt to rewind/load it.
1946                          */
1947                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1948                         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
1949                                 xpt_print_path(periph->path);
1950                                 kprintf("error %d on TUR in samount\n", error);
1951                         }
1952                 }
1953         } else {
1954                 error = sareservereleaseunit(periph, TRUE);
1955                 if (error) {
1956                         return (error);
1957                 }
1958                 ccb = cam_periph_getccb(periph, 1);
1959                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1960                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1961                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1962                     &softc->device_stats);
1963                 QFRLS(ccb);
1964         }
1965
1966         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
1967                 struct scsi_read_block_limits_data *rblim = NULL;
1968                 int comp_enabled, comp_supported;
1969                 u_int8_t write_protect, guessing = 0;
1970
1971                 /*
1972                  * Clear out old state.
1973                  */
1974                 softc->flags &= ~(SA_FLAG_TAPE_WP|SA_FLAG_TAPE_WRITTEN|
1975                                   SA_FLAG_ERR_PENDING|SA_FLAG_COMP_ENABLED|
1976                                   SA_FLAG_COMP_SUPP|SA_FLAG_COMP_UNSUPP);
1977                 softc->filemarks = 0;
1978
1979                 /*
1980                  * *Very* first off, make sure we're loaded to BOT.
1981                  */
1982                 scsi_load_unload(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
1983                     FALSE, FALSE, 1, SSD_FULL_SIZE, REWIND_TIMEOUT);
1984                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1985                     &softc->device_stats);
1986                 QFRLS(ccb);
1987
1988                 /*
1989                  * In case this doesn't work, do a REWIND instead
1990                  */
1991                 if (error) {
1992                         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
1993                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1994                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1995                                 &softc->device_stats);
1996                         QFRLS(ccb);
1997                 }
1998                 if (error) {
1999                         xpt_release_ccb(ccb);
2000                         goto exit;
2001                 }
2002
2003                 /*
2004                  * Do a dummy test read to force access to the
2005                  * media so that the drive will really know what's
2006                  * there. We actually don't really care what the
2007                  * blocksize on tape is and don't expect to really
2008                  * read a full record.
2009                  */
2010                 rblim = kmalloc(8192, M_TEMP, M_INTWAIT);
2011
2012                 if ((softc->quirks & SA_QUIRK_NODREAD) == 0) {
2013                         scsi_sa_read_write(&ccb->csio, 0, sadone,
2014                             MSG_SIMPLE_Q_TAG, 1, FALSE, 0, 8192,
2015                             (void *) rblim, 8192, SSD_FULL_SIZE,
2016                             IO_TIMEOUT);
2017                         cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2018                             &softc->device_stats);
2019                         QFRLS(ccb);
2020                         scsi_rewind(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
2021                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
2022                         error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
2023                             SF_NO_PRINT | SF_RETRY_UA,
2024                             &softc->device_stats);
2025                         QFRLS(ccb);
2026                         if (error) {
2027                                 xpt_print_path(periph->path);
2028                                 kprintf("unable to rewind after test read\n");
2029                                 xpt_release_ccb(ccb);
2030                                 goto exit;
2031                         }
2032                 }
2033
2034                 /*
2035                  * Next off, determine block limits.
2036                  */
2037                 scsi_read_block_limits(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
2038                     rblim, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2039
2040                 error = cam_periph_runccb(ccb, saerror, CAM_RETRY_SELTO,
2041                     SF_NO_PRINT | SF_RETRY_UA, &softc->device_stats);
2042
2043                 QFRLS(ccb);
2044                 xpt_release_ccb(ccb);
2045
2046                 if (error != 0) {
2047                         /*
2048                          * If it's less than SCSI-2, READ BLOCK LIMITS is not
2049                          * a MANDATORY command. Anyway- it doesn't matter-
2050                          * we can proceed anyway.
2051                          */
2052                         softc->blk_gran = 0;
2053                         softc->max_blk = ~0;
2054                         softc->min_blk = 0;
2055                 } else {
2056                         if (softc->scsi_rev >= SCSI_REV_SPC) {
2057                                 softc->blk_gran = RBL_GRAN(rblim);
2058                         } else {
2059                                 softc->blk_gran = 0;
2060                         }
2061                         /*
2062                          * We take max_blk == min_blk to mean a default to
2063                          * fixed mode- but note that whatever we get out of
2064                          * sagetparams below will actually determine whether
2065                          * we are actually *in* fixed mode.
2066                          */
2067                         softc->max_blk = scsi_3btoul(rblim->maximum);
2068                         softc->min_blk = scsi_2btoul(rblim->minimum);
2069
2070
2071                 }
2072                 /*
2073                  * Next, perform a mode sense to determine
2074                  * current density, blocksize, compression etc.
2075                  */
2076                 error = sagetparams(periph, SA_PARAM_ALL,
2077                                     &softc->media_blksize,
2078                                     &softc->media_density,
2079                                     &softc->media_numblks,
2080                                     &softc->buffer_mode, &write_protect,
2081                                     &softc->speed, &comp_supported,
2082                                     &comp_enabled, &softc->comp_algorithm,
2083                                     NULL);
2084
2085                 if (error != 0) {
2086                         /*
2087                          * We could work a little harder here. We could
2088                          * adjust our attempts to get information. It
2089                          * might be an ancient tape drive. If someone
2090                          * nudges us, we'll do that.
2091                          */
2092                         goto exit;
2093                 }
2094
2095                 /*
2096                  * If no quirk has determined that this is a device that is
2097                  * preferred to be in fixed or variable mode, now is the time
2098                  * to find out.
2099                  */
2100                 if ((softc->quirks & (SA_QUIRK_FIXED|SA_QUIRK_VARIABLE)) == 0) {
2101                         guessing = 1;
2102                         /*
2103                          * This could be expensive to find out. Luckily we
2104                          * only need to do this once. If we start out in
2105                          * 'default' mode, try and set ourselves to one
2106                          * of the densities that would determine a wad
2107                          * of other stuff. Go from highest to lowest.
2108                          */
2109                         if (softc->media_density == SCSI_DEFAULT_DENSITY) {
2110                                 int i;
2111                                 static u_int8_t ctry[] = {
2112                                         SCSI_DENSITY_HALFINCH_PE,
2113                                         SCSI_DENSITY_HALFINCH_6250C,
2114                                         SCSI_DENSITY_HALFINCH_6250,
2115                                         SCSI_DENSITY_HALFINCH_1600,
2116                                         SCSI_DENSITY_HALFINCH_800,
2117                                         SCSI_DENSITY_QIC_4GB,
2118                                         SCSI_DENSITY_QIC_2GB,
2119                                         SCSI_DENSITY_QIC_525_320,
2120                                         SCSI_DENSITY_QIC_150,
2121                                         SCSI_DENSITY_QIC_120,
2122                                         SCSI_DENSITY_QIC_24,
2123                                         SCSI_DENSITY_QIC_11_9TRK,
2124                                         SCSI_DENSITY_QIC_11_4TRK,
2125                                         SCSI_DENSITY_QIC_1320,
2126                                         SCSI_DENSITY_QIC_3080,
2127                                         0
2128                                 };
2129                                 for (i = 0; ctry[i]; i++) {
2130                                         error = sasetparams(periph,
2131                                             SA_PARAM_DENSITY, 0, ctry[i],
2132                                             0, SF_NO_PRINT);
2133                                         if (error == 0) {
2134                                                 softc->media_density = ctry[i];
2135                                                 break;
2136                                         }
2137                                 }
2138                         }
2139                         switch (softc->media_density) {
2140                         case SCSI_DENSITY_QIC_11_4TRK:
2141                         case SCSI_DENSITY_QIC_11_9TRK:
2142                         case SCSI_DENSITY_QIC_24:
2143                         case SCSI_DENSITY_QIC_120:
2144                         case SCSI_DENSITY_QIC_150:
2145                         case SCSI_DENSITY_QIC_525_320:
2146                         case SCSI_DENSITY_QIC_1320:
2147                         case SCSI_DENSITY_QIC_3080:
2148                                 softc->quirks &= ~SA_QUIRK_2FM;
2149                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2150                                 softc->last_media_blksize = 512;
2151                                 break;
2152                         case SCSI_DENSITY_QIC_4GB:
2153                         case SCSI_DENSITY_QIC_2GB:
2154                                 softc->quirks &= ~SA_QUIRK_2FM;
2155                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2156                                 softc->last_media_blksize = 1024;
2157                                 break;
2158                         default:
2159                                 softc->last_media_blksize =
2160                                     softc->media_blksize;
2161                                 softc->quirks |= SA_QUIRK_VARIABLE;
2162                                 break;
2163                         }
2164                 }
2165
2166                 /*
2167                  * If no quirk has determined that this is a device that needs
2168                  * to have 2 Filemarks at EOD, now is the time to find out.
2169                  */
2170
2171                 if ((softc->quirks & SA_QUIRK_2FM) == 0) {
2172                         switch (softc->media_density) {
2173                         case SCSI_DENSITY_HALFINCH_800:
2174                         case SCSI_DENSITY_HALFINCH_1600:
2175                         case SCSI_DENSITY_HALFINCH_6250:
2176                         case SCSI_DENSITY_HALFINCH_6250C:
2177                         case SCSI_DENSITY_HALFINCH_PE:
2178                                 softc->quirks &= ~SA_QUIRK_1FM;
2179                                 softc->quirks |= SA_QUIRK_2FM;
2180                                 break;
2181                         default:
2182                                 break;
2183                         }
2184                 }
2185
2186                 /*
2187                  * Now validate that some info we got makes sense.
2188                  */
2189                 if ((softc->max_blk < softc->media_blksize) ||
2190                     (softc->min_blk > softc->media_blksize &&
2191                     softc->media_blksize)) {
2192                         xpt_print_path(periph->path);
2193                         kprintf("BLOCK LIMITS (%d..%d) could not match current "
2194                             "block settings (%d)- adjusting\n", softc->min_blk,
2195                             softc->max_blk, softc->media_blksize);
2196                         softc->max_blk = softc->min_blk =
2197                             softc->media_blksize;
2198                 }
2199
2200                 /*
2201                  * Now put ourselves into the right frame of mind based
2202                  * upon quirks...
2203                  */
2204 tryagain:
2205                 /*
2206                  * If we want to be in FIXED mode and our current blocksize
2207                  * is not equal to our last blocksize (if nonzero), try and
2208                  * set ourselves to this last blocksize (as the 'preferred'
2209                  * block size).  The initial quirkmatch at registry sets the
2210                  * initial 'last' blocksize. If, for whatever reason, this
2211                  * 'last' blocksize is zero, set the blocksize to 512,
2212                  * or min_blk if that's larger.
2213                  */
2214                 if ((softc->quirks & SA_QUIRK_FIXED) &&
2215                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0 &&
2216                     (softc->media_blksize != softc->last_media_blksize)) {
2217                         softc->media_blksize = softc->last_media_blksize;
2218                         if (softc->media_blksize == 0) {
2219                                 softc->media_blksize = 512;
2220                                 if (softc->media_blksize < softc->min_blk) {
2221                                         softc->media_blksize = softc->min_blk;
2222                                 }
2223                         }
2224                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2225                             softc->media_blksize, 0, 0, SF_NO_PRINT);
2226                         if (error) {
2227                                 xpt_print_path(periph->path);
2228                                 kprintf("unable to set fixed blocksize to %d\n",
2229                                      softc->media_blksize);
2230                                 goto exit;
2231                         }
2232                 }
2233
2234                 if ((softc->quirks & SA_QUIRK_VARIABLE) &&
2235                     (softc->media_blksize != 0)) {
2236                         softc->last_media_blksize = softc->media_blksize;
2237                         softc->media_blksize = 0;
2238                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2239                             0, 0, 0, SF_NO_PRINT);
2240                         if (error) {
2241                                 /*
2242                                  * If this fails and we were guessing, just
2243                                  * assume that we got it wrong and go try
2244                                  * fixed block mode. Don't even check against
2245                                  * density code at this point.
2246                                  */
2247                                 if (guessing) {
2248                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
2249                                         softc->quirks |= SA_QUIRK_FIXED;
2250                                         if (softc->last_media_blksize == 0)
2251                                                 softc->last_media_blksize = 512;
2252                                         goto tryagain;
2253                                 }
2254                                 xpt_print_path(periph->path);
2255                                 kprintf("unable to set variable blocksize\n");
2256                                 goto exit;
2257                         }
2258                 }
2259
2260                 /*
2261                  * Now that we have the current block size,
2262                  * set up some parameters for sastart's usage.
2263                  */
2264                 if (softc->media_blksize) {
2265                         softc->flags |= SA_FLAG_FIXED;
2266                         if (powerof2(softc->media_blksize)) {
2267                                 softc->blk_shift =
2268                                     ffs(softc->media_blksize) - 1;
2269                                 softc->blk_mask = softc->media_blksize - 1;
2270                         } else {
2271                                 softc->blk_mask = ~0;
2272                                 softc->blk_shift = 0;
2273                         }
2274                 } else {
2275                         /*
2276                          * The SCSI-3 spec allows 0 to mean "unspecified".
2277                          * The SCSI-1 spec allows 0 to mean 'infinite'.
2278                          *
2279                          * Either works here.
2280                          */
2281                         if (softc->max_blk == 0) {
2282                                 softc->max_blk = ~0;
2283                         }
2284                         softc->blk_shift = 0;
2285                         if (softc->blk_gran != 0) {
2286                                 softc->blk_mask = softc->blk_gran - 1;
2287                         } else {
2288                                 softc->blk_mask = 0;
2289                         }
2290                 }
2291
2292                 if (write_protect)
2293                         softc->flags |= SA_FLAG_TAPE_WP;
2294
2295                 if (comp_supported) {
2296                         if (softc->saved_comp_algorithm == 0)
2297                                 softc->saved_comp_algorithm =
2298                                     softc->comp_algorithm;
2299                         softc->flags |= SA_FLAG_COMP_SUPP;
2300                         if (comp_enabled)
2301                                 softc->flags |= SA_FLAG_COMP_ENABLED;
2302                 } else
2303                         softc->flags |= SA_FLAG_COMP_UNSUPP;
2304
2305                 if ((softc->buffer_mode == SMH_SA_BUF_MODE_NOBUF) &&
2306                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0) {
2307                         error = sasetparams(periph, SA_PARAM_BUFF_MODE, 0,
2308                             0, 0, SF_NO_PRINT);
2309                         if (error == 0) {
2310                                 softc->buffer_mode = SMH_SA_BUF_MODE_SIBUF;
2311                         } else {
2312                                 xpt_print_path(periph->path);
2313                                 kprintf("unable to set buffered mode\n");
2314                         }
2315                         error = 0;      /* not an error */
2316                 }
2317
2318
2319                 if (error == 0) {
2320                         softc->flags |= SA_FLAG_TAPE_MOUNTED;
2321                 }
2322 exit:
2323                 if (rblim != NULL)
2324                         kfree(rblim, M_TEMP);
2325
2326                 if (error != 0) {
2327                         softc->dsreg = MTIO_DSREG_NIL;
2328                 } else {
2329                         softc->fileno = softc->blkno = 0;
2330                         softc->dsreg = MTIO_DSREG_REST;
2331                 }
2332 #ifdef  SA_1FM_AT_EOD
2333                 if ((softc->quirks & SA_QUIRK_2FM) == 0)
2334                         softc->quirks |= SA_QUIRK_1FM;
2335 #else
2336                 if ((softc->quirks & SA_QUIRK_1FM) == 0)
2337                         softc->quirks |= SA_QUIRK_2FM;
2338 #endif
2339         } else
2340                 xpt_release_ccb(ccb);
2341
2342         /*
2343          * If we return an error, we're not mounted any more,
2344          * so release any device reservation.
2345          */
2346         if (error != 0) {
2347                 sareservereleaseunit(periph, FALSE);
2348         } else {
2349                 /*
2350                  * Clear I/O residual.
2351                  */
2352                 softc->last_io_resid = 0;
2353                 softc->last_ctl_resid = 0;
2354         }
2355         return (error);
2356 }
2357
2358 /*
2359  * How many filemarks do we need to write if we were to terminate the
2360  * tape session right now? Note that this can be a negative number
2361  */
2362
2363 static int
2364 samarkswanted(struct cam_periph *periph)
2365 {
2366         int     markswanted;
2367         struct  sa_softc *softc;
2368
2369         softc = (struct sa_softc *)periph->softc;
2370         markswanted = 0;
2371         if ((softc->flags & SA_FLAG_TAPE_WRITTEN) != 0) {
2372                 markswanted++;
2373                 if (softc->quirks & SA_QUIRK_2FM)
2374                         markswanted++;
2375         }
2376         markswanted -= softc->filemarks;
2377         return (markswanted);
2378 }
2379
2380 static int
2381 sacheckeod(struct cam_periph *periph)
2382 {
2383         int     error;
2384         int     markswanted;
2385
2386         markswanted = samarkswanted(periph);
2387
2388         if (markswanted > 0) {
2389                 error = sawritefilemarks(periph, markswanted, FALSE);
2390         } else {
2391                 error = 0;
2392         }
2393         return (error);
2394 }
2395
2396 static int
2397 saerror(union ccb *ccb, u_int32_t cflgs, u_int32_t sflgs)
2398 {
2399         static const char *toobig =
2400             "%d-byte tape record bigger than supplied buffer\n";
2401         struct  cam_periph *periph;
2402         struct  sa_softc *softc;
2403         struct  ccb_scsiio *csio;
2404         struct  scsi_sense_data *sense;
2405         u_int32_t resid = 0;
2406         int32_t info = 0;
2407         cam_status status;
2408         int error_code, sense_key, asc, ascq, error, aqvalid;
2409
2410         periph = xpt_path_periph(ccb->ccb_h.path);
2411         softc = (struct sa_softc *)periph->softc;
2412         csio = &ccb->csio;
2413         sense = &csio->sense_data;
2414         scsi_extract_sense(sense, &error_code, &sense_key, &asc, &ascq);
2415         aqvalid = sense->extra_len >= 6;
2416         error = 0;
2417
2418         status = csio->ccb_h.status & CAM_STATUS_MASK;
2419
2420         /*
2421          * Calculate/latch up, any residuals... We do this in a funny 2-step
2422          * so we can print stuff here if we have CAM_DEBUG enabled for this
2423          * unit.
2424          */
2425         if (status == CAM_SCSI_STATUS_ERROR) {
2426                 if ((sense->error_code & SSD_ERRCODE_VALID) != 0) {
2427                         info = (int32_t) scsi_4btoul(sense->info);
2428                         resid = info;
2429                         if ((softc->flags & SA_FLAG_FIXED) != 0)
2430                                 resid *= softc->media_blksize;
2431                 } else {
2432                         resid = csio->dxfer_len;
2433                         info = resid;
2434                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
2435                                 if (softc->media_blksize)
2436                                         info /= softc->media_blksize;
2437                         }
2438                 }
2439                 if (CCB_Type(csio) == SA_CCB_BUFFER_IO) {
2440                         bcopy((caddr_t) sense, (caddr_t) &softc->last_io_sense,
2441                             sizeof (struct scsi_sense_data));
2442                         bcopy(csio->cdb_io.cdb_bytes, softc->last_io_cdb,
2443                             (int) csio->cdb_len);
2444                         softc->last_io_resid = resid;
2445                         softc->last_resid_was_io = 1;
2446                 } else {
2447                         bcopy((caddr_t) sense, (caddr_t) &softc->last_ctl_sense,
2448                             sizeof (struct scsi_sense_data));
2449                         bcopy(csio->cdb_io.cdb_bytes, softc->last_ctl_cdb,
2450                             (int) csio->cdb_len);
2451                         softc->last_ctl_resid = resid;
2452                         softc->last_resid_was_io = 0;
2453                 }
2454                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("CDB[0]=0x%x Key 0x%x "
2455                     "ASC/ASCQ 0x%x/0x%x CAM STATUS 0x%x flags 0x%x resid %d "
2456                     "dxfer_len %d\n", csio->cdb_io.cdb_bytes[0] & 0xff,
2457                     sense_key, asc, ascq, status,
2458                     sense->flags & ~SSD_KEY_RESERVED, resid, csio->dxfer_len));
2459         } else {
2460                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
2461                     ("Cam Status 0x%x\n", status));
2462         }
2463
2464         switch (status) {
2465         case CAM_REQ_CMP:
2466                 return (0);
2467         case CAM_SCSI_STATUS_ERROR:
2468                 /*
2469                  * If a read/write command, we handle it here.
2470                  */
2471                 if (CCB_Type(csio) != SA_CCB_WAITING) {
2472                         break;
2473                 }
2474                 /*
2475                  * If this was just EOM/EOP, Filemark, Setmark or ILI detected
2476                  * on a non read/write command, we assume it's not an error
2477                  * and propagate the residule and return.
2478                  */
2479                 if ((aqvalid && asc == 0 && ascq > 0 && ascq <= 5) ||
2480                     (aqvalid == 0 && sense_key == SSD_KEY_NO_SENSE)) {
2481                         csio->resid = resid;
2482                         QFRLS(ccb);
2483                         return (0);
2484                 }
2485                 /*
2486                  * Otherwise, we let the common code handle this.
2487                  */
2488                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2489
2490         /*
2491          * XXX: To Be Fixed
2492          * We cannot depend upon CAM honoring retry counts for these.
2493          */
2494         case CAM_SCSI_BUS_RESET:
2495         case CAM_BDR_SENT:
2496                 if (ccb->ccb_h.retry_count <= 0) {
2497                         return (EIO);
2498                 }
2499                 /* FALLTHROUGH */
2500         default:
2501                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2502         }
2503
2504         /*
2505          * Handle filemark, end of tape, mismatched record sizes....
2506          * From this point out, we're only handling read/write cases.
2507          * Handle writes && reads differently.
2508          */
2509
2510         if (csio->cdb_io.cdb_bytes[0] == SA_WRITE) {
2511                 if (sense_key == SSD_KEY_VOLUME_OVERFLOW) {
2512                         csio->resid = resid;
2513                         error = ENOSPC;
2514                 } else if (sense->flags & SSD_EOM) {
2515                         softc->flags |= SA_FLAG_EOM_PENDING;
2516                         /*
2517                          * Grotesque as it seems, the few times
2518                          * I've actually seen a non-zero resid,
2519                          * the tape drive actually lied and had
2520                          * written all the data!.
2521                          */
2522                         csio->resid = 0;
2523                 }
2524         } else {
2525                 csio->resid = resid;
2526                 if (sense_key == SSD_KEY_BLANK_CHECK) {
2527                         if (softc->quirks & SA_QUIRK_1FM) {
2528                                 error = 0;
2529                                 softc->flags |= SA_FLAG_EOM_PENDING;
2530                         } else {
2531                                 error = EIO;
2532                         }
2533                 } else if (sense->flags & SSD_FILEMARK) {
2534                         if (softc->flags & SA_FLAG_FIXED) {
2535                                 error = -1;
2536                                 softc->flags |= SA_FLAG_EOF_PENDING;
2537                         }
2538                         /*
2539                          * Unconditionally, if we detected a filemark on a read,
2540                          * mark that we've run moved a file ahead.
2541                          */
2542                         if (softc->fileno != (daddr_t) -1) {
2543                                 softc->fileno++;
2544                                 softc->blkno = 0;
2545                                 csio->ccb_h.ccb_pflags |= SA_POSITION_UPDATED;
2546                         }
2547                 }
2548         }
2549
2550         /*
2551          * Incorrect Length usually applies to read, but can apply to writes.
2552          */
2553         if (error == 0 && (sense->flags & SSD_ILI)) {
2554                 if (info < 0) {
2555                         xpt_print_path(csio->ccb_h.path);
2556                         kprintf(toobig, csio->dxfer_len - info);
2557                         csio->resid = csio->dxfer_len;
2558                         error = EIO;
2559                 } else {
2560                         csio->resid = resid;
2561                         if (softc->flags & SA_FLAG_FIXED) {
2562                                 softc->flags |= SA_FLAG_EIO_PENDING;
2563                         }
2564                         /*
2565                          * Bump the block number if we hadn't seen a filemark.
2566                          * Do this independent of errors (we've moved anyway).
2567                          */
2568                         if ((sense->flags & SSD_FILEMARK) == 0) {
2569                                 if (softc->blkno != (daddr_t) -1) {
2570                                         softc->blkno++;
2571                                         csio->ccb_h.ccb_pflags |=
2572                                            SA_POSITION_UPDATED;
2573                                 }
2574                         }
2575                 }
2576         }
2577
2578         if (error <= 0) {
2579                 /*
2580                  * Unfreeze the queue if frozen as we're not returning anything
2581                  * to our waiters that would indicate an I/O error has occurred
2582                  * (yet).
2583                  */
2584                 QFRLS(ccb);
2585                 error = 0;
2586         }
2587         return (error);
2588 }
2589
2590 static int
2591 sagetparams(struct cam_periph *periph, sa_params params_to_get,
2592             u_int32_t *blocksize, u_int8_t *density, u_int32_t *numblocks,
2593             int *buff_mode, u_int8_t *write_protect, u_int8_t *speed,
2594             int *comp_supported, int *comp_enabled, u_int32_t *comp_algorithm,
2595             sa_comp_t *tcs)
2596 {
2597         union ccb *ccb;
2598         void *mode_buffer;
2599         struct scsi_mode_header_6 *mode_hdr;
2600         struct scsi_mode_blk_desc *mode_blk;
2601         int mode_buffer_len;
2602         struct sa_softc *softc;
2603         u_int8_t cpage;
2604         int error;
2605         cam_status status;
2606
2607         softc = (struct sa_softc *)periph->softc;
2608         ccb = cam_periph_getccb(periph, 1);
2609         if (softc->quirks & SA_QUIRK_NO_CPAGE)
2610                 cpage = SA_DEVICE_CONFIGURATION_PAGE;
2611         else
2612                 cpage = SA_DATA_COMPRESSION_PAGE;
2613
2614 retry:
2615         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2616
2617         if (params_to_get & SA_PARAM_COMPRESSION) {
2618                 if (softc->quirks & SA_QUIRK_NOCOMP) {
2619                         *comp_supported = FALSE;
2620                         params_to_get &= ~SA_PARAM_COMPRESSION;
2621                 } else
2622                         mode_buffer_len += sizeof (sa_comp_t);
2623         }
2624
2625         mode_buffer = kmalloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2626         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2627         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2628
2629         /* it is safe to retry this */
2630         scsi_mode_sense(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2631             SMS_PAGE_CTRL_CURRENT, (params_to_get & SA_PARAM_COMPRESSION) ?
2632             cpage : SMS_VENDOR_SPECIFIC_PAGE, mode_buffer, mode_buffer_len,
2633             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2634
2635         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2636             &softc->device_stats);
2637         QFRLS(ccb);
2638
2639         status = ccb->ccb_h.status & CAM_STATUS_MASK;
2640
2641         if (error == EINVAL && (params_to_get & SA_PARAM_COMPRESSION) != 0) {
2642                 /*
2643                  * Hmm. Let's see if we can try another page...
2644                  * If we've already done that, give up on compression
2645                  * for this device and remember this for the future
2646                  * and attempt the request without asking for compression
2647                  * info.
2648                  */
2649                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2650                         cpage = SA_DEVICE_CONFIGURATION_PAGE;
2651                         goto retry;
2652                 }
2653                 softc->quirks |= SA_QUIRK_NOCOMP;
2654                 kfree(mode_buffer, M_TEMP);
2655                 goto retry;
2656         } else if (status == CAM_SCSI_STATUS_ERROR) {
2657                 /* Tell the user about the fatal error. */
2658                 scsi_sense_print(&ccb->csio);
2659                 goto sagetparamsexit;
2660         }
2661
2662         /*
2663          * If the user only wants the compression information, and
2664          * the device doesn't send back the block descriptor, it's
2665          * no big deal.  If the user wants more than just
2666          * compression, though, and the device doesn't pass back the
2667          * block descriptor, we need to send another mode sense to
2668          * get the block descriptor.
2669          */
2670         if ((mode_hdr->blk_desc_len == 0) &&
2671             (params_to_get & SA_PARAM_COMPRESSION) &&
2672             (params_to_get & ~(SA_PARAM_COMPRESSION))) {
2673
2674                 /*
2675                  * Decrease the mode buffer length by the size of
2676                  * the compression page, to make sure the data
2677                  * there doesn't get overwritten.
2678                  */
2679                 mode_buffer_len -= sizeof (sa_comp_t);
2680
2681                 /*
2682                  * Now move the compression page that we presumably
2683                  * got back down the memory chunk a little bit so
2684                  * it doesn't get spammed.
2685                  */
2686                 bcopy(&mode_hdr[0], &mode_hdr[1], sizeof (sa_comp_t));
2687                 bzero(&mode_hdr[0], sizeof (mode_hdr[0]));
2688
2689                 /*
2690                  * Now, we issue another mode sense and just ask
2691                  * for the block descriptor, etc.
2692                  */
2693
2694                 scsi_mode_sense(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2695                     SMS_PAGE_CTRL_CURRENT, SMS_VENDOR_SPECIFIC_PAGE,
2696                     mode_buffer, mode_buffer_len, SSD_FULL_SIZE,
2697                     SCSIOP_TIMEOUT);
2698
2699                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2700                     &softc->device_stats);
2701                 QFRLS(ccb);
2702
2703                 if (error != 0)
2704                         goto sagetparamsexit;
2705         }
2706
2707         if (params_to_get & SA_PARAM_BLOCKSIZE)
2708                 *blocksize = scsi_3btoul(mode_blk->blklen);
2709
2710         if (params_to_get & SA_PARAM_NUMBLOCKS)
2711                 *numblocks = scsi_3btoul(mode_blk->nblocks);
2712
2713         if (params_to_get & SA_PARAM_BUFF_MODE)
2714                 *buff_mode = mode_hdr->dev_spec & SMH_SA_BUF_MODE_MASK;
2715
2716         if (params_to_get & SA_PARAM_DENSITY)
2717                 *density = mode_blk->density;
2718
2719         if (params_to_get & SA_PARAM_WP)
2720                 *write_protect = (mode_hdr->dev_spec & SMH_SA_WP)? TRUE : FALSE;
2721
2722         if (params_to_get & SA_PARAM_SPEED)
2723                 *speed = mode_hdr->dev_spec & SMH_SA_SPEED_MASK;
2724
2725         if (params_to_get & SA_PARAM_COMPRESSION) {
2726                 sa_comp_t *ntcs = (sa_comp_t *) &mode_blk[1];
2727                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2728                         struct scsi_data_compression_page *cp = &ntcs->dcomp;
2729                         *comp_supported =
2730                             (cp->dce_and_dcc & SA_DCP_DCC)? TRUE : FALSE;
2731                         *comp_enabled =
2732                             (cp->dce_and_dcc & SA_DCP_DCE)? TRUE : FALSE;
2733                         *comp_algorithm = scsi_4btoul(cp->comp_algorithm);
2734                 } else {
2735                         struct scsi_dev_conf_page *cp = &ntcs->dconf;
2736                         /*
2737                          * We don't really know whether this device supports
2738                          * Data Compression if the the algorithm field is
2739                          * zero. Just say we do.
2740                          */
2741                         *comp_supported = TRUE;
2742                         *comp_enabled =
2743                             (cp->sel_comp_alg != SA_COMP_NONE)? TRUE : FALSE;
2744                         *comp_algorithm = cp->sel_comp_alg;
2745                 }
2746                 if (tcs != NULL)
2747                         bcopy(ntcs, tcs, sizeof (sa_comp_t));
2748         }
2749
2750         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2751                 int idx;
2752                 char *xyz = mode_buffer;
2753                 xpt_print_path(periph->path);
2754                 kprintf("Mode Sense Data=");
2755                 for (idx = 0; idx < mode_buffer_len; idx++)
2756                         kprintf(" 0x%02x", xyz[idx] & 0xff);
2757                 kprintf("\n");
2758         }
2759
2760 sagetparamsexit:
2761
2762         xpt_release_ccb(ccb);
2763         kfree(mode_buffer, M_TEMP);
2764         return (error);
2765 }
2766
2767 /*
2768  * The purpose of this function is to set one of four different parameters
2769  * for a tape drive:
2770  *      - blocksize
2771  *      - density
2772  *      - compression / compression algorithm
2773  *      - buffering mode
2774  *
2775  * The assumption is that this will be called from saioctl(), and therefore
2776  * from a process context.  Thus the waiting malloc calls below.  If that
2777  * assumption ever changes, the malloc calls should be changed to be
2778  * NOWAIT mallocs.
2779  *
2780  * Any or all of the four parameters may be set when this function is
2781  * called.  It should handle setting more than one parameter at once.
2782  */
2783 static int
2784 sasetparams(struct cam_periph *periph, sa_params params_to_set,
2785             u_int32_t blocksize, u_int8_t density, u_int32_t calg,
2786             u_int32_t sense_flags)
2787 {
2788         struct sa_softc *softc;
2789         u_int32_t current_blocksize;
2790         u_int32_t current_calg;
2791         u_int8_t current_density;
2792         u_int8_t current_speed;
2793         int comp_enabled, comp_supported;
2794         void *mode_buffer;
2795         int mode_buffer_len;
2796         struct scsi_mode_header_6 *mode_hdr;
2797         struct scsi_mode_blk_desc *mode_blk;
2798         sa_comp_t *ccomp, *cpage;
2799         int buff_mode;
2800         union ccb *ccb = NULL;
2801         int error;
2802
2803         softc = (struct sa_softc *)periph->softc;
2804
2805         ccomp = kmalloc(sizeof (sa_comp_t), M_TEMP, M_INTWAIT);
2806
2807         /*
2808          * Since it doesn't make sense to set the number of blocks, or
2809          * write protection, we won't try to get the current value.  We
2810          * always want to get the blocksize, so we can set it back to the
2811          * proper value.
2812          */
2813         error = sagetparams(periph,
2814             params_to_set | SA_PARAM_BLOCKSIZE | SA_PARAM_SPEED,
2815             &current_blocksize, &current_density, NULL, &buff_mode, NULL,
2816             &current_speed, &comp_supported, &comp_enabled,
2817             &current_calg, ccomp);
2818
2819         if (error != 0) {
2820                 kfree(ccomp, M_TEMP);
2821                 return (error);
2822         }
2823
2824         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2825         if (params_to_set & SA_PARAM_COMPRESSION)
2826                 mode_buffer_len += sizeof (sa_comp_t);
2827
2828         mode_buffer = kmalloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2829
2830         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2831         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2832
2833         ccb = cam_periph_getccb(periph, 1);
2834
2835 retry:
2836
2837         if (params_to_set & SA_PARAM_COMPRESSION) {
2838                 if (mode_blk) {
2839                         cpage = (sa_comp_t *)&mode_blk[1];
2840                 } else {
2841                         cpage = (sa_comp_t *)&mode_hdr[1];
2842                 }
2843                 bcopy(ccomp, cpage, sizeof (sa_comp_t));
2844                 cpage->hdr.pagecode &= ~0x80;
2845         } else
2846                 cpage = NULL;
2847
2848         /*
2849          * If the caller wants us to set the blocksize, use the one they
2850          * pass in.  Otherwise, use the blocksize we got back from the
2851          * mode select above.
2852          */
2853         if (mode_blk) {
2854                 if (params_to_set & SA_PARAM_BLOCKSIZE)
2855                         scsi_ulto3b(blocksize, mode_blk->blklen);
2856                 else
2857                         scsi_ulto3b(current_blocksize, mode_blk->blklen);
2858
2859                 /*
2860                  * Set density if requested, else preserve old density.
2861                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2862                  * devices, else density we've latched up in our softc.
2863                  */
2864                 if (params_to_set & SA_PARAM_DENSITY) {
2865                         mode_blk->density = density;
2866                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2867                         mode_blk->density = SCSI_SAME_DENSITY;
2868                 } else {
2869                         mode_blk->density = softc->media_density;
2870                 }
2871         }
2872
2873         /*
2874          * For mode selects, these two fields must be zero.
2875          */
2876         mode_hdr->data_length = 0;
2877         mode_hdr->medium_type = 0;
2878
2879         /* set the speed to the current value */
2880         mode_hdr->dev_spec = current_speed;
2881
2882         /* if set, set single-initiator buffering mode */
2883         if (softc->buffer_mode == SMH_SA_BUF_MODE_SIBUF) {
2884                 mode_hdr->dev_spec |= SMH_SA_BUF_MODE_SIBUF;
2885         }
2886
2887         if (mode_blk)
2888                 mode_hdr->blk_desc_len = sizeof(struct scsi_mode_blk_desc);
2889         else
2890                 mode_hdr->blk_desc_len = 0;
2891
2892         /*
2893          * First, if the user wants us to set the compression algorithm or
2894          * just turn compression on, check to make sure that this drive
2895          * supports compression.
2896          */
2897         if (params_to_set & SA_PARAM_COMPRESSION) {
2898                 /*
2899                  * If the compression algorithm is 0, disable compression.
2900                  * If the compression algorithm is non-zero, enable
2901                  * compression and set the compression type to the
2902                  * specified compression algorithm, unless the algorithm is
2903                  * MT_COMP_ENABLE.  In that case, we look at the
2904                  * compression algorithm that is currently set and if it is
2905                  * non-zero, we leave it as-is.  If it is zero, and we have
2906                  * saved a compression algorithm from a time when
2907                  * compression was enabled before, set the compression to
2908                  * the saved value.
2909                  */
2910                 switch (ccomp->hdr.pagecode & ~0x80) {
2911                 case SA_DEVICE_CONFIGURATION_PAGE:
2912                 {
2913                         struct scsi_dev_conf_page *dcp = &cpage->dconf;
2914                         if (calg == 0) {
2915                                 dcp->sel_comp_alg = SA_COMP_NONE;
2916                                 break;
2917                         }
2918                         if (calg != MT_COMP_ENABLE) {
2919                                 dcp->sel_comp_alg = calg;
2920                         } else if (dcp->sel_comp_alg == SA_COMP_NONE &&
2921                             softc->saved_comp_algorithm != 0) {
2922                                 dcp->sel_comp_alg = softc->saved_comp_algorithm;
2923                         }
2924                         break;
2925                 }
2926                 case SA_DATA_COMPRESSION_PAGE:
2927                 if (ccomp->dcomp.dce_and_dcc & SA_DCP_DCC) {
2928                         struct scsi_data_compression_page *dcp = &cpage->dcomp;
2929                         if (calg == 0) {
2930                                 /*
2931                                  * Disable compression, but leave the
2932                                  * decompression and the capability bit
2933                                  * alone.
2934                                  */
2935                                 dcp->dce_and_dcc = SA_DCP_DCC;
2936                                 dcp->dde_and_red |= SA_DCP_DDE;
2937                                 break;
2938                         }
2939                         /* enable compression && decompression */
2940                         dcp->dce_and_dcc = SA_DCP_DCE | SA_DCP_DCC;
2941                         dcp->dde_and_red |= SA_DCP_DDE;
2942                         /*
2943                          * If there, use compression algorithm from caller.
2944                          * Otherwise, if there's a saved compression algorithm
2945                          * and there is no current algorithm, use the saved
2946                          * algorithm. Else parrot back what we got and hope
2947                          * for the best.
2948                          */
2949                         if (calg != MT_COMP_ENABLE) {
2950                                 scsi_ulto4b(calg, dcp->comp_algorithm);
2951                                 scsi_ulto4b(calg, dcp->decomp_algorithm);
2952                         } else if (scsi_4btoul(dcp->comp_algorithm) == 0 &&
2953                             softc->saved_comp_algorithm != 0) {
2954                                 scsi_ulto4b(softc->saved_comp_algorithm,
2955                                     dcp->comp_algorithm);
2956                                 scsi_ulto4b(softc->saved_comp_algorithm,
2957                                     dcp->decomp_algorithm);
2958                         }
2959                         break;
2960                 }
2961                 /*
2962                  * Compression does not appear to be supported-
2963                  * at least via the DATA COMPRESSION page. It
2964                  * would be too much to ask us to believe that
2965                  * the page itself is supported, but incorrectly
2966                  * reports an ability to manipulate data compression,
2967                  * so we'll assume that this device doesn't support
2968                  * compression. We can just fall through for that.
2969                  */
2970                 /* FALLTHROUGH */
2971                 default:
2972                         /*
2973                          * The drive doesn't seem to support compression,
2974                          * so turn off the set compression bit.
2975                          */
2976                         params_to_set &= ~SA_PARAM_COMPRESSION;
2977                         xpt_print_path(periph->path);
2978                         kprintf("device does not seem to support compression\n");
2979
2980                         /*
2981                          * If that was the only thing the user wanted us to set,
2982                          * clean up allocated resources and return with
2983                          * 'operation not supported'.
2984                          */
2985                         if (params_to_set == SA_PARAM_NONE) {
2986                                 kfree(mode_buffer, M_TEMP);
2987                                 xpt_release_ccb(ccb);
2988                                 return (ENODEV);
2989                         }
2990
2991                         /*
2992                          * That wasn't the only thing the user wanted us to set.
2993                          * So, decrease the stated mode buffer length by the
2994                          * size of the compression mode page.
2995                          */
2996                         mode_buffer_len -= sizeof(sa_comp_t);
2997                 }
2998         }
2999
3000         /* It is safe to retry this operation */
3001         scsi_mode_select(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
3002             (params_to_set & SA_PARAM_COMPRESSION)? TRUE : FALSE,
3003             FALSE, mode_buffer, mode_buffer_len, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3004
3005         error = cam_periph_runccb(ccb, saerror, 0,
3006             sense_flags, &softc->device_stats);
3007         QFRLS(ccb);
3008
3009         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
3010                 int idx;
3011                 char *xyz = mode_buffer;
3012                 xpt_print_path(periph->path);
3013                 kprintf("Err%d, Mode Select Data=", error);
3014                 for (idx = 0; idx < mode_buffer_len; idx++)
3015                         kprintf(" 0x%02x", xyz[idx] & 0xff);
3016                 kprintf("\n");
3017         }
3018
3019
3020         if (error) {
3021                 /*
3022                  * If we can, try without setting density/blocksize.
3023                  */
3024                 if (mode_blk) {
3025                         if ((params_to_set &
3026                             (SA_PARAM_DENSITY|SA_PARAM_BLOCKSIZE)) == 0) {
3027                                 mode_blk = NULL;
3028                                 goto retry;
3029                         }
3030                 } else {
3031                         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
3032                         cpage = (sa_comp_t *)&mode_blk[1];
3033                 }
3034
3035                 /*
3036                  * If we were setting the blocksize, and that failed, we
3037                  * want to set it to its original value.  If we weren't
3038                  * setting the blocksize, we don't want to change it.
3039                  */
3040                 scsi_ulto3b(current_blocksize, mode_blk->blklen);
3041
3042                 /*
3043                  * Set density if requested, else preserve old density.
3044                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
3045                  * devices, else density we've latched up in our softc.
3046                  */
3047                 if (params_to_set & SA_PARAM_DENSITY) {
3048                         mode_blk->density = current_density;
3049                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
3050                         mode_blk->density = SCSI_SAME_DENSITY;
3051                 } else {
3052                         mode_blk->density = softc->media_density;
3053                 }
3054
3055                 if (params_to_set & SA_PARAM_COMPRESSION)
3056                         bcopy(ccomp, cpage, sizeof (sa_comp_t));
3057
3058                 /*
3059                  * The retry count is the only CCB field that might have been
3060                  * changed that we care about, so reset it back to 1.
3061                  */
3062                 ccb->ccb_h.retry_count = 1;
3063                 cam_periph_runccb(ccb, saerror, 0, sense_flags,
3064                     &softc->device_stats);
3065                 QFRLS(ccb);
3066         }
3067
3068         xpt_release_ccb(ccb);
3069
3070         if (ccomp != NULL)
3071                 kfree(ccomp, M_TEMP);
3072
3073         if (params_to_set & SA_PARAM_COMPRESSION) {
3074                 if (error) {
3075                         softc->flags &= ~SA_FLAG_COMP_ENABLED;
3076                         /*
3077                          * Even if we get an error setting compression,
3078                          * do not say that we don't support it. We could
3079                          * have been wrong, or it may be media specific.
3080                          *      softc->flags &= ~SA_FLAG_COMP_SUPP;
3081                          */
3082                         softc->saved_comp_algorithm = softc->comp_algorithm;
3083                         softc->comp_algorithm = 0;
3084                 } else {
3085                         softc->flags |= SA_FLAG_COMP_ENABLED;
3086                         softc->comp_algorithm = calg;
3087                 }
3088         }
3089
3090         kfree(mode_buffer, M_TEMP);
3091         return (error);
3092 }
3093
3094 static void
3095 saprevent(struct cam_periph *periph, int action)
3096 {
3097         struct  sa_softc *softc;
3098         union   ccb *ccb;
3099         int     error, sf;
3100
3101         softc = (struct sa_softc *)periph->softc;
3102
3103         if ((action == PR_ALLOW) && (softc->flags & SA_FLAG_TAPE_LOCKED) == 0)
3104                 return;
3105         if ((action == PR_PREVENT) && (softc->flags & SA_FLAG_TAPE_LOCKED) != 0)
3106                 return;
3107
3108         /*
3109          * We can be quiet about illegal requests.
3110          */
3111         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
3112                 sf = 0;
3113         } else
3114                 sf = SF_QUIET_IR;
3115
3116         ccb = cam_periph_getccb(periph, 1);
3117
3118         /* It is safe to retry this operation */
3119         scsi_prevent(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, action,
3120             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3121
3122         error = cam_periph_runccb(ccb, saerror, 0, sf, &softc->device_stats);
3123         QFRLS(ccb);
3124         if (error == 0) {
3125                 if (action == PR_ALLOW)
3126                         softc->flags &= ~SA_FLAG_TAPE_LOCKED;
3127                 else
3128                         softc->flags |= SA_FLAG_TAPE_LOCKED;
3129         }
3130
3131         xpt_release_ccb(ccb);
3132 }
3133
3134 static int
3135 sarewind(struct cam_periph *periph)
3136 {
3137         union   ccb *ccb;
3138         struct  sa_softc *softc;
3139         int     error;
3140
3141         softc = (struct sa_softc *)periph->softc;
3142
3143         ccb = cam_periph_getccb(periph, 1);
3144
3145         /* It is safe to retry this operation */
3146         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3147             SSD_FULL_SIZE, REWIND_TIMEOUT);
3148
3149         softc->dsreg = MTIO_DSREG_REW;
3150         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3151         softc->dsreg = MTIO_DSREG_REST;
3152
3153         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3154                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3155
3156         xpt_release_ccb(ccb);
3157         if (error == 0)
3158                 softc->fileno = softc->blkno = (daddr_t) 0;
3159         else
3160                 softc->fileno = softc->blkno = (daddr_t) -1;
3161         return (error);
3162 }
3163
3164 static int
3165 saspace(struct cam_periph *periph, int count, scsi_space_code code)
3166 {
3167         union   ccb *ccb;
3168         struct  sa_softc *softc;
3169         int     error;
3170
3171         softc = (struct sa_softc *)periph->softc;
3172
3173         ccb = cam_periph_getccb(periph, 1);
3174
3175         /* This cannot be retried */
3176
3177         scsi_space(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG, code, count,
3178             SSD_FULL_SIZE, SPACE_TIMEOUT);
3179
3180         /*
3181          * Clear residual because we will be using it.
3182          */
3183         softc->last_ctl_resid = 0;
3184
3185         softc->dsreg = (count < 0)? MTIO_DSREG_REV : MTIO_DSREG_FWD;
3186         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3187         softc->dsreg = MTIO_DSREG_REST;
3188
3189         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3190                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3191
3192         xpt_release_ccb(ccb);
3193
3194         /*
3195          * If a spacing operation has failed, we need to invalidate
3196          * this mount.
3197          *
3198          * If the spacing operation was setmarks or to end of recorded data,
3199          * we no longer know our relative position.
3200          *
3201          * If the spacing operations was spacing files in reverse, we
3202          * take account of the residual, but still check against less
3203          * than zero- if we've gone negative, we must have hit BOT.
3204          *
3205          * If the spacing operations was spacing records in reverse and
3206          * we have a residual, we've either hit BOT or hit a filemark.
3207          * In the former case, we know our new record number (0). In
3208          * the latter case, we have absolutely no idea what the real
3209          * record number is- we've stopped between the end of the last
3210          * record in the previous file and the filemark that stopped
3211          * our spacing backwards.
3212          */
3213         if (error) {
3214                 softc->fileno = softc->blkno = (daddr_t) -1;
3215         } else if (code == SS_SETMARKS || code == SS_EOD) {
3216                 softc->fileno = softc->blkno = (daddr_t) -1;
3217         } else if (code == SS_FILEMARKS && softc->fileno != (daddr_t) -1) {
3218                 softc->fileno += (count - softc->last_ctl_resid);
3219                 if (softc->fileno < 0)  /* we must of hit BOT */
3220                         softc->fileno = 0;
3221                 softc->blkno = 0;
3222         } else if (code == SS_BLOCKS && softc->blkno != (daddr_t) -1) {
3223                 softc->blkno += (count - softc->last_ctl_resid);
3224                 if (count < 0) {
3225                         if (softc->last_ctl_resid || softc->blkno < 0) {
3226                                 if (softc->fileno == 0) {
3227                                         softc->blkno = 0;
3228                                 } else {
3229                                         softc->blkno = (daddr_t) -1;
3230                                 }
3231                         }
3232                 }
3233         }
3234         return (error);
3235 }
3236
3237 static int
3238 sawritefilemarks(struct cam_periph *periph, int nmarks, int setmarks)
3239 {
3240         union   ccb *ccb;
3241         struct  sa_softc *softc;
3242         int     error, nwm = 0;
3243
3244         softc = (struct sa_softc *)periph->softc;
3245         if (softc->open_rdonly)
3246                 return (EBADF);
3247
3248         ccb = cam_periph_getccb(periph, 1);
3249         /*
3250          * Clear residual because we will be using it.
3251          */
3252         softc->last_ctl_resid = 0;
3253
3254         softc->dsreg = MTIO_DSREG_FMK;
3255         /* this *must* not be retried */
3256         scsi_write_filemarks(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG,
3257             FALSE, setmarks, nmarks, SSD_FULL_SIZE, IO_TIMEOUT);
3258         softc->dsreg = MTIO_DSREG_REST;
3259
3260
3261         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3262
3263         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3264                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3265
3266         if (error == 0 && nmarks) {
3267                 struct sa_softc *softc = (struct sa_softc *)periph->softc;
3268                 nwm = nmarks - softc->last_ctl_resid;
3269                 softc->filemarks += nwm;
3270         }
3271
3272         xpt_release_ccb(ccb);
3273
3274         /*
3275          * Update relative positions (if we're doing that).
3276          */
3277         if (error) {
3278                 softc->fileno = softc->blkno = (daddr_t) -1;
3279         } else if (softc->fileno != (daddr_t) -1) {
3280                 softc->fileno += nwm;
3281                 softc->blkno = 0;
3282         }
3283         return (error);
3284 }
3285
3286 static int
3287 sardpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3288 {
3289         struct scsi_tape_position_data loc;
3290         union ccb *ccb;
3291         struct sa_softc *softc = (struct sa_softc *)periph->softc;
3292         int error;
3293
3294         /*
3295          * We try and flush any buffered writes here if we were writing
3296          * and we're trying to get hardware block position. It eats
3297          * up performance substantially, but I'm wary of drive firmware.
3298          *
3299          * I think that *logical* block position is probably okay-
3300          * but hardware block position might have to wait for data
3301          * to hit media to be valid. Caveat Emptor.
3302          */
3303
3304         if (hard && (softc->flags & SA_FLAG_TAPE_WRITTEN)) {
3305                 error = sawritefilemarks(periph, 0, 0);
3306                 if (error && error != EACCES)
3307                         return (error);
3308         }
3309
3310         ccb = cam_periph_getccb(periph, 1);
3311         scsi_read_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3312             hard, &loc, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3313         softc->dsreg = MTIO_DSREG_RBSY;
3314         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3315         softc->dsreg = MTIO_DSREG_REST;
3316         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3317                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3318
3319         if (error == 0) {
3320                 if (loc.flags & SA_RPOS_UNCERTAIN) {
3321                         error = EINVAL;         /* nothing is certain */
3322                 } else {
3323                         *blkptr = scsi_4btoul(loc.firstblk);
3324                 }
3325         }
3326
3327         xpt_release_ccb(ccb);
3328         return (error);
3329 }
3330
3331 static int
3332 sasetpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3333 {
3334         union ccb *ccb;
3335         struct sa_softc *softc;
3336         int error;
3337
3338         /*
3339          * We used to try and flush any buffered writes here.
3340          * Now we push this onto user applications to either
3341          * flush the pending writes themselves (via a zero count
3342          * WRITE FILEMARKS command) or they can trust their tape
3343          * drive to do this correctly for them.
3344          */
3345
3346         softc = (struct sa_softc *)periph->softc;
3347         ccb = cam_periph_getccb(periph, 1);
3348
3349
3350         scsi_set_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3351             hard, *blkptr, SSD_FULL_SIZE, SPACE_TIMEOUT);
3352
3353
3354         softc->dsreg = MTIO_DSREG_POS;
3355         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3356         softc->dsreg = MTIO_DSREG_REST;
3357         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3358                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3359         xpt_release_ccb(ccb);
3360         /*
3361          * Note relative file && block number position as now unknown.
3362          */
3363         softc->fileno = softc->blkno = (daddr_t) -1;
3364         return (error);
3365 }
3366
3367 static int
3368 saretension(struct cam_periph *periph)
3369 {
3370         union ccb *ccb;
3371         struct sa_softc *softc;
3372         int error;
3373
3374         softc = (struct sa_softc *)periph->softc;
3375
3376         ccb = cam_periph_getccb(periph, 1);
3377
3378         /* It is safe to retry this operation */
3379         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3380             FALSE, TRUE,  TRUE, SSD_FULL_SIZE, ERASE_TIMEOUT);
3381
3382         softc->dsreg = MTIO_DSREG_TEN;
3383         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3384         softc->dsreg = MTIO_DSREG_REST;
3385
3386         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3387                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3388         xpt_release_ccb(ccb);
3389         if (error == 0)
3390                 softc->fileno = softc->blkno = (daddr_t) 0;
3391         else
3392                 softc->fileno = softc->blkno = (daddr_t) -1;
3393         return (error);
3394 }
3395
3396 static int
3397 sareservereleaseunit(struct cam_periph *periph, int reserve)
3398 {
3399         union ccb *ccb;
3400         struct sa_softc *softc;
3401         int error;
3402
3403         softc = (struct sa_softc *)periph->softc;
3404         ccb = cam_periph_getccb(periph,  1);
3405
3406         /* It is safe to retry this operation */
3407         scsi_reserve_release_unit(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
3408             FALSE,  0, SSD_FULL_SIZE,  SCSIOP_TIMEOUT, reserve);
3409         softc->dsreg = MTIO_DSREG_RBSY;
3410         error = cam_periph_runccb(ccb, saerror, 0,
3411             SF_RETRY_UA | SF_NO_PRINT, &softc->device_stats);
3412         softc->dsreg = MTIO_DSREG_REST;
3413         QFRLS(ccb);
3414         xpt_release_ccb(ccb);
3415
3416         /*
3417          * If the error was Illegal Request, then the device doesn't support
3418          * RESERVE/RELEASE. This is not an error.
3419          */
3420         if (error == EINVAL) {
3421                 error = 0;
3422         }
3423
3424         return (error);
3425 }
3426
3427 static int
3428 saloadunload(struct cam_periph *periph, int load)
3429 {
3430         union   ccb *ccb;
3431         struct  sa_softc *softc;
3432         int     error;
3433
3434         softc = (struct sa_softc *)periph->softc;
3435
3436         ccb = cam_periph_getccb(periph, 1);
3437
3438         /* It is safe to retry this operation */
3439         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3440             FALSE, FALSE, load, SSD_FULL_SIZE, REWIND_TIMEOUT);
3441
3442         softc->dsreg = (load)? MTIO_DSREG_LD : MTIO_DSREG_UNL;
3443         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3444         softc->dsreg = MTIO_DSREG_REST;
3445         QFRLS(ccb);
3446         xpt_release_ccb(ccb);
3447
3448         if (error || load == 0)
3449                 softc->fileno = softc->blkno = (daddr_t) -1;
3450         else if (error == 0)
3451                 softc->fileno = softc->blkno = (daddr_t) 0;
3452         return (error);
3453 }
3454
3455 static int
3456 saerase(struct cam_periph *periph, int longerase)
3457 {
3458
3459         union   ccb *ccb;
3460         struct  sa_softc *softc;
3461         int error;
3462
3463         softc = (struct sa_softc *)periph->softc;
3464         if (softc->open_rdonly)
3465                 return (EBADF);
3466
3467         ccb = cam_periph_getccb(periph, 1);
3468
3469         scsi_erase(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG, FALSE, longerase,
3470             SSD_FULL_SIZE, ERASE_TIMEOUT);
3471
3472         softc->dsreg = MTIO_DSREG_ZER;
3473         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3474         softc->dsreg = MTIO_DSREG_REST;
3475
3476         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3477                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3478         xpt_release_ccb(ccb);
3479         return (error);
3480 }
3481
3482 #endif /* _KERNEL */
3483
3484 /*
3485  * Read tape block limits command.
3486  */
3487 void
3488 scsi_read_block_limits(struct ccb_scsiio *csio, u_int32_t retries,
3489                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3490                    u_int8_t tag_action,
3491                    struct scsi_read_block_limits_data *rlimit_buf,
3492                    u_int8_t sense_len, u_int32_t timeout)
3493 {
3494         struct scsi_read_block_limits *scsi_cmd;
3495
3496         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3497              (u_int8_t *)rlimit_buf, sizeof(*rlimit_buf), sense_len,
3498              sizeof(*scsi_cmd), timeout);
3499
3500         scsi_cmd = (struct scsi_read_block_limits *)&csio->cdb_io.cdb_bytes;
3501         bzero(scsi_cmd, sizeof(*scsi_cmd));
3502         scsi_cmd->opcode = READ_BLOCK_LIMITS;
3503 }
3504
3505 void
3506 scsi_sa_read_write(struct ccb_scsiio *csio, u_int32_t retries,
3507                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3508                    u_int8_t tag_action, int readop, int sli,
3509                    int fixed, u_int32_t length, u_int8_t *data_ptr,
3510                    u_int32_t dxfer_len, u_int8_t sense_len, u_int32_t timeout)
3511 {
3512         struct scsi_sa_rw *scsi_cmd;
3513
3514         scsi_cmd = (struct scsi_sa_rw *)&csio->cdb_io.cdb_bytes;
3515         scsi_cmd->opcode = readop ? SA_READ : SA_WRITE;
3516         scsi_cmd->sli_fixed = 0;
3517         if (sli && readop)
3518                 scsi_cmd->sli_fixed |= SAR_SLI;
3519         if (fixed)
3520                 scsi_cmd->sli_fixed |= SARW_FIXED;
3521         scsi_ulto3b(length, scsi_cmd->length);
3522         scsi_cmd->control = 0;
3523
3524         cam_fill_csio(csio, retries, cbfcnp, readop ? CAM_DIR_IN : CAM_DIR_OUT,
3525             tag_action, data_ptr, dxfer_len, sense_len,
3526             sizeof(*scsi_cmd), timeout);
3527 }
3528
3529 void
3530 scsi_load_unload(struct ccb_scsiio *csio, u_int32_t retries,
3531                  void (*cbfcnp)(struct cam_periph *, union ccb *),
3532                  u_int8_t tag_action, int immediate, int eot,
3533                  int reten, int load, u_int8_t sense_len,
3534                  u_int32_t timeout)
3535 {
3536         struct scsi_load_unload *scsi_cmd;
3537
3538         scsi_cmd = (struct scsi_load_unload *)&csio->cdb_io.cdb_bytes;
3539         bzero(scsi_cmd, sizeof(*scsi_cmd));
3540         scsi_cmd->opcode = LOAD_UNLOAD;
3541         if (immediate)
3542                 scsi_cmd->immediate = SLU_IMMED;
3543         if (eot)
3544                 scsi_cmd->eot_reten_load |= SLU_EOT;
3545         if (reten)
3546                 scsi_cmd->eot_reten_load |= SLU_RETEN;
3547         if (load)
3548                 scsi_cmd->eot_reten_load |= SLU_LOAD;
3549
3550         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3551             NULL, 0, sense_len, sizeof(*scsi_cmd), timeout);
3552 }
3553
3554 void
3555 scsi_rewind(struct ccb_scsiio *csio, u_int32_t retries,
3556             void (*cbfcnp)(struct cam_periph *, union ccb *),
3557             u_int8_t tag_action, int immediate, u_int8_t sense_len,
3558             u_int32_t timeout)
3559 {
3560         struct scsi_rewind *scsi_cmd;
3561
3562         scsi_cmd = (struct scsi_rewind *)&csio->cdb_io.cdb_bytes;
3563         bzero(scsi_cmd, sizeof(*scsi_cmd));
3564         scsi_cmd->opcode = REWIND;
3565         if (immediate)
3566                 scsi_cmd->immediate = SREW_IMMED;
3567
3568         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3569             0, sense_len, sizeof(*scsi_cmd), timeout);
3570 }
3571
3572 void
3573 scsi_space(struct ccb_scsiio *csio, u_int32_t retries,
3574            void (*cbfcnp)(struct cam_periph *, union ccb *),
3575            u_int8_t tag_action, scsi_space_code code,
3576            u_int32_t count, u_int8_t sense_len, u_int32_t timeout)
3577 {
3578         struct scsi_space *scsi_cmd;
3579
3580         scsi_cmd = (struct scsi_space *)&csio->cdb_io.cdb_bytes;
3581         scsi_cmd->opcode = SPACE;
3582         scsi_cmd->code = code;
3583         scsi_ulto3b(count, scsi_cmd->count);
3584         scsi_cmd->control = 0;
3585
3586         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3587             0, sense_len, sizeof(*scsi_cmd), timeout);
3588 }
3589
3590 void
3591 scsi_write_filemarks(struct ccb_scsiio *csio, u_int32_t retries,
3592                      void (*cbfcnp)(struct cam_periph *, union ccb *),
3593                      u_int8_t tag_action, int immediate, int setmark,
3594                      u_int32_t num_marks, u_int8_t sense_len,
3595                      u_int32_t timeout)
3596 {
3597         struct scsi_write_filemarks *scsi_cmd;
3598
3599         scsi_cmd = (struct scsi_write_filemarks *)&csio->cdb_io.cdb_bytes;
3600         bzero(scsi_cmd, sizeof(*scsi_cmd));
3601         scsi_cmd->opcode = WRITE_FILEMARKS;
3602         if (immediate)
3603                 scsi_cmd->byte2 |= SWFMRK_IMMED;
3604         if (setmark)
3605                 scsi_cmd->byte2 |= SWFMRK_WSMK;
3606
3607         scsi_ulto3b(num_marks, scsi_cmd->num_marks);
3608
3609         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3610             0, sense_len, sizeof(*scsi_cmd), timeout);
3611 }
3612
3613 /*
3614  * The reserve and release unit commands differ only by their opcodes.
3615  */
3616 void
3617 scsi_reserve_release_unit(struct ccb_scsiio *csio, u_int32_t retries,
3618                           void (*cbfcnp)(struct cam_periph *, union ccb *),
3619                           u_int8_t tag_action, int third_party,
3620                           int third_party_id, u_int8_t sense_len,
3621                           u_int32_t timeout, int reserve)
3622 {
3623         struct scsi_reserve_release_unit *scsi_cmd;
3624
3625         scsi_cmd = (struct scsi_reserve_release_unit *)&csio->cdb_io.cdb_bytes;
3626         bzero(scsi_cmd, sizeof(*scsi_cmd));
3627
3628         if (reserve)
3629                 scsi_cmd->opcode = RESERVE_UNIT;
3630         else
3631                 scsi_cmd->opcode = RELEASE_UNIT;
3632
3633         if (third_party) {
3634                 scsi_cmd->lun_thirdparty |= SRRU_3RD_PARTY;
3635                 scsi_cmd->lun_thirdparty |=
3636                         ((third_party_id << SRRU_3RD_SHAMT) & SRRU_3RD_MASK);
3637         }
3638
3639         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3640             0, sense_len, sizeof(*scsi_cmd), timeout);
3641 }
3642
3643 void
3644 scsi_erase(struct ccb_scsiio *csio, u_int32_t retries,
3645            void (*cbfcnp)(struct cam_periph *, union ccb *),
3646            u_int8_t tag_action, int immediate, int long_erase,
3647            u_int8_t sense_len, u_int32_t timeout)
3648 {
3649         struct scsi_erase *scsi_cmd;
3650
3651         scsi_cmd = (struct scsi_erase *)&csio->cdb_io.cdb_bytes;
3652         bzero(scsi_cmd, sizeof(*scsi_cmd));
3653
3654         scsi_cmd->opcode = ERASE;
3655
3656         if (immediate)
3657                 scsi_cmd->lun_imm_long |= SE_IMMED;
3658
3659         if (long_erase)
3660                 scsi_cmd->lun_imm_long |= SE_LONG;
3661
3662         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3663             0, sense_len, sizeof(*scsi_cmd), timeout);
3664 }
3665
3666 /*
3667  * Read Tape Position command.
3668  */
3669 void
3670 scsi_read_position(struct ccb_scsiio *csio, u_int32_t retries,
3671                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3672                    u_int8_t tag_action, int hardsoft,
3673                    struct scsi_tape_position_data *sbp,
3674                    u_int8_t sense_len, u_int32_t timeout)
3675 {
3676         struct scsi_tape_read_position *scmd;
3677
3678         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3679             (u_int8_t *)sbp, sizeof (*sbp), sense_len, sizeof(*scmd), timeout);
3680         scmd = (struct scsi_tape_read_position *)&csio->cdb_io.cdb_bytes;
3681         bzero(scmd, sizeof(*scmd));
3682         scmd->opcode = READ_POSITION;
3683         scmd->byte1 = hardsoft;
3684 }
3685
3686 /*
3687  * Set Tape Position command.
3688  */
3689 void
3690 scsi_set_position(struct ccb_scsiio *csio, u_int32_t retries,
3691                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3692                    u_int8_t tag_action, int hardsoft, u_int32_t blkno,
3693                    u_int8_t sense_len, u_int32_t timeout)
3694 {
3695         struct scsi_tape_locate *scmd;
3696
3697         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3698             (u_int8_t *)NULL, 0, sense_len, sizeof(*scmd), timeout);
3699         scmd = (struct scsi_tape_locate *)&csio->cdb_io.cdb_bytes;
3700         bzero(scmd, sizeof(*scmd));
3701         scmd->opcode = LOCATE;
3702         if (hardsoft)
3703                 scmd->byte1 |= SA_SPOS_BT;
3704         scsi_ulto4b(blkno, scmd->blkaddr);
3705 }