b65f61131bcd22dab9e635f6adf555f521ee0e37
[dragonfly.git] / 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 1.20 2006/09/10 01:26:32 dillon Exp $
4  *
5  * Implementation of SCSI Sequential Access Peripheral driver for CAM.
6  *
7  * Copyright (c) 1999, 2000 Matthew Jacob
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions, and the following disclaimer,
15  *    without modification, immediately at the beginning of the file.
16  * 2. The name of the author may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
23  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  */
32
33 #include <sys/param.h>
34 #include <sys/queue.h>
35 #ifdef _KERNEL
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #endif
39 #include <sys/types.h>
40 #ifdef _KERNEL
41 #include <sys/buf.h>
42 #include <sys/malloc.h>
43 #endif
44 #include <sys/mtio.h>
45 #include <sys/conf.h>
46 #ifdef _KERNEL
47 #include <sys/proc.h>
48 #include <sys/buf2.h>
49 #include <sys/thread2.h>
50 #endif
51 #include <sys/devicestat.h>
52 #include <machine/limits.h>
53
54 #ifndef _KERNEL
55 #include <stdio.h>
56 #include <string.h>
57 #endif
58
59 #include "../cam.h"
60 #include "../cam_ccb.h"
61 #include "../cam_extend.h"
62 #include "../cam_periph.h"
63 #include "../cam_xpt_periph.h"
64 #include "../cam_debug.h"
65
66 #include "scsi_all.h"
67 #include "scsi_message.h"
68 #include "scsi_sa.h"
69
70 #ifdef _KERNEL
71
72 #include <opt_sa.h>
73
74 #ifndef SA_IO_TIMEOUT
75 #define SA_IO_TIMEOUT           4
76 #endif
77 #ifndef SA_SPACE_TIMEOUT
78 #define SA_SPACE_TIMEOUT        1 * 60
79 #endif
80 #ifndef SA_REWIND_TIMEOUT
81 #define SA_REWIND_TIMEOUT       2 * 60
82 #endif
83 #ifndef SA_ERASE_TIMEOUT
84 #define SA_ERASE_TIMEOUT        4 * 60
85 #endif
86
87 #define SCSIOP_TIMEOUT          (60 * 1000)     /* not an option */
88
89 #define IO_TIMEOUT              (SA_IO_TIMEOUT * 60 * 1000)
90 #define REWIND_TIMEOUT          (SA_REWIND_TIMEOUT * 60 * 1000)
91 #define ERASE_TIMEOUT           (SA_ERASE_TIMEOUT * 60 * 1000)
92 #define SPACE_TIMEOUT           (SA_SPACE_TIMEOUT * 60 * 1000)
93
94 /*
95  * Additional options that can be set for config: SA_1FM_AT_EOT
96  */
97
98 #ifndef UNUSED_PARAMETER
99 #define UNUSED_PARAMETER(x)     x = x
100 #endif
101
102 #define QFRLS(ccb)      \
103         if (((ccb)->ccb_h.status & CAM_DEV_QFRZN) != 0) \
104                 cam_release_devq((ccb)->ccb_h.path, 0, 0, 0, FALSE)
105
106 /*
107  * Driver states
108  */
109
110
111 typedef enum {
112         SA_STATE_NORMAL, SA_STATE_ABNORMAL
113 } sa_state;
114
115 #define ccb_pflags      ppriv_field0
116 #define ccb_bio         ppriv_ptr1
117
118 #define SA_CCB_BUFFER_IO        0x0
119 #define SA_CCB_WAITING          0x1
120 #define SA_CCB_TYPEMASK         0x1
121 #define SA_POSITION_UPDATED     0x2
122
123 #define Set_CCB_Type(x, type)                           \
124         x->ccb_h.ccb_pflags &= ~SA_CCB_TYPEMASK;        \
125         x->ccb_h.ccb_pflags |= type
126
127 #define CCB_Type(x)     (x->ccb_h.ccb_pflags & SA_CCB_TYPEMASK)
128
129
130
131 typedef enum {
132         SA_FLAG_OPEN            = 0x0001,
133         SA_FLAG_FIXED           = 0x0002,
134         SA_FLAG_TAPE_LOCKED     = 0x0004,
135         SA_FLAG_TAPE_MOUNTED    = 0x0008,
136         SA_FLAG_TAPE_WP         = 0x0010,
137         SA_FLAG_TAPE_WRITTEN    = 0x0020,
138         SA_FLAG_EOM_PENDING     = 0x0040,
139         SA_FLAG_EIO_PENDING     = 0x0080,
140         SA_FLAG_EOF_PENDING     = 0x0100,
141         SA_FLAG_ERR_PENDING     = (SA_FLAG_EOM_PENDING|SA_FLAG_EIO_PENDING|
142                                    SA_FLAG_EOF_PENDING),
143         SA_FLAG_INVALID         = 0x0200,
144         SA_FLAG_COMP_ENABLED    = 0x0400,
145         SA_FLAG_COMP_SUPP       = 0x0800,
146         SA_FLAG_COMP_UNSUPP     = 0x1000,
147         SA_FLAG_TAPE_FROZEN     = 0x2000
148 } sa_flags;
149
150 typedef enum {
151         SA_MODE_REWIND          = 0x00,
152         SA_MODE_NOREWIND        = 0x01,
153         SA_MODE_OFFLINE         = 0x02
154 } sa_mode;
155
156 typedef enum {
157         SA_PARAM_NONE           = 0x00,
158         SA_PARAM_BLOCKSIZE      = 0x01,
159         SA_PARAM_DENSITY        = 0x02,
160         SA_PARAM_COMPRESSION    = 0x04,
161         SA_PARAM_BUFF_MODE      = 0x08,
162         SA_PARAM_NUMBLOCKS      = 0x10,
163         SA_PARAM_WP             = 0x20,
164         SA_PARAM_SPEED          = 0x40,
165         SA_PARAM_ALL            = 0x7f
166 } sa_params;
167
168 typedef enum {
169         SA_QUIRK_NONE           = 0x00,
170         SA_QUIRK_NOCOMP         = 0x01, /* Can't deal with compression at all */
171         SA_QUIRK_FIXED          = 0x02, /* Force fixed mode */
172         SA_QUIRK_VARIABLE       = 0x04, /* Force variable mode */
173         SA_QUIRK_2FM            = 0x08, /* Needs Two File Marks at EOD */
174         SA_QUIRK_1FM            = 0x10, /* No more than 1 File Mark at EOD */
175         SA_QUIRK_NODREAD        = 0x20, /* Don't try and dummy read density */
176         SA_QUIRK_NO_MODESEL     = 0x40, /* Don't do mode select at all */
177         SA_QUIRK_NO_CPAGE       = 0x80  /* Don't use DEVICE COMPRESSION page */
178 } sa_quirks;
179
180 /* units are bits 4-7, 16-21 (1024 units) */
181 #define SAUNIT(DEV) \
182         (((minor(DEV) & 0xF0) >> 4) |  ((minor(DEV) & 0x3f0000) >> 16))
183
184 #define SAMODE(z) ((minor(z) & 0x3))
185 #define SADENSITY(z) (((minor(z) >> 2) & 0x3))
186 #define SA_IS_CTRL(z) (minor(z) & (1 << 29))
187
188 #define SA_NOT_CTLDEV   0
189 #define SA_CTLDEV       1
190
191 #define SA_ATYPE_R      0
192 #define SA_ATYPE_NR     1
193 #define SA_ATYPE_ER     2
194
195 #define SAMINOR(ctl, unit, mode, access) \
196         ((ctl << 29) | ((unit & 0x3f0) << 16) | ((unit & 0xf) << 4) | \
197         (mode << 0x2) | (access & 0x3))
198
199 #define SA_UNITMASK     SAMINOR(0, -1, 0, 0)
200 #define SA_UNIT(unit)   SAMINOR(0, unit, 0, 0)
201
202 #define SA_NUM_MODES    4
203
204 struct sa_softc {
205         sa_state        state;
206         sa_flags        flags;
207         sa_quirks       quirks;
208         struct          bio_queue_head bio_queue;
209         int             queue_count;
210         struct          devstat device_stats;
211         int             blk_gran;
212         int             blk_mask;
213         int             blk_shift;
214         u_int32_t       max_blk;
215         u_int32_t       min_blk;
216         u_int32_t       comp_algorithm;
217         u_int32_t       saved_comp_algorithm;
218         u_int32_t       media_blksize;
219         u_int32_t       last_media_blksize;
220         u_int32_t       media_numblks;
221         u_int8_t        media_density;
222         u_int8_t        speed;
223         u_int8_t        scsi_rev;
224         u_int8_t        dsreg;          /* mtio mt_dsreg, redux */
225         int             buffer_mode;
226         int             filemarks;
227         union           ccb saved_ccb;
228         int             last_resid_was_io;
229
230         /*
231          * Relative to BOT Location.
232          */
233         daddr_t         fileno;
234         daddr_t         blkno;
235
236         /*
237          * Latched Error Info
238          */
239         struct {
240                 struct scsi_sense_data _last_io_sense;
241                 u_int32_t _last_io_resid;
242                 u_int8_t _last_io_cdb[CAM_MAX_CDBLEN];
243                 struct scsi_sense_data _last_ctl_sense;
244                 u_int32_t _last_ctl_resid;
245                 u_int8_t _last_ctl_cdb[CAM_MAX_CDBLEN];
246 #define last_io_sense   errinfo._last_io_sense
247 #define last_io_resid   errinfo._last_io_resid
248 #define last_io_cdb     errinfo._last_io_cdb
249 #define last_ctl_sense  errinfo._last_ctl_sense
250 #define last_ctl_resid  errinfo._last_ctl_resid
251 #define last_ctl_cdb    errinfo._last_ctl_cdb
252         } errinfo;
253         /*
254          * Misc other flags/state
255          */
256         u_int32_t
257                                 : 31,
258                 ctrl_mode       : 1;    /* control device open */
259 };
260
261 struct sa_quirk_entry {
262         struct scsi_inquiry_pattern inq_pat;    /* matching pattern */
263         sa_quirks quirks;       /* specific quirk type */
264         u_int32_t prefblk;      /* preferred blocksize when in fixed mode */
265 };
266
267 static struct sa_quirk_entry sa_quirk_table[] =
268 {
269         {
270                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "OnStream",
271                   "ADR*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_NODREAD |
272                    SA_QUIRK_1FM|SA_QUIRK_NO_MODESEL, 32768
273         },
274         {
275                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
276                   "Python 06408*", "*"}, SA_QUIRK_NODREAD, 0
277         },
278         {
279                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
280                   "Python 25601*", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_NODREAD, 0
281         },
282         {
283                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
284                   "Python*", "*"}, SA_QUIRK_NODREAD, 0
285         },
286         {
287                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
288                   "VIPER 150*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
289         },
290         {
291                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
292                   "VIPER 2525 25462", "-011"},
293                   SA_QUIRK_NOCOMP|SA_QUIRK_1FM|SA_QUIRK_NODREAD, 0
294         },
295         {
296                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "ARCHIVE",
297                   "VIPER 2525*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
298         },
299 #if     0
300         {
301                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
302                   "C15*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_NO_CPAGE, 0,
303         },
304 #endif
305         {
306                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
307                   "C56*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
308         },
309         {
310                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
311                   "T20*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
312         },
313         {
314                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
315                   "T4000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
316         },
317         {
318                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
319                   "HP-88780*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
320         },
321         {
322                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "KENNEDY",
323                   "*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
324         },
325         {
326                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "M4 DATA",
327                   "123107 SCSI*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
328         },
329         {       /* jreynold@primenet.com */
330                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
331                 "STT8000N*", "*"}, SA_QUIRK_1FM, 0
332         },
333         {       /* mike@sentex.net */
334                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "Seagate",
335                 "STT20000*", "*"}, SA_QUIRK_1FM, 0
336         },
337         {
338                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
339                   " TDC 3600", "U07:"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
340         },
341         {
342                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
343                   " TDC 3800", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
344         },
345         {
346                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
347                   " TDC 4100", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
348         },
349         {
350                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
351                   " TDC 4200", "*"}, SA_QUIRK_NOCOMP|SA_QUIRK_1FM, 512
352         },
353         {
354                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "TANDBERG",
355                   " SLR*", "*"}, SA_QUIRK_1FM, 0
356         },
357         {
358                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
359                   "5525ES*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
360         },
361         {
362                 { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "WANGTEK",
363                   "51000*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 1024
364         }
365 };
366
367 static  d_open_t        saopen;
368 static  d_close_t       saclose;
369 static  d_strategy_t    sastrategy;
370 static  d_ioctl_t       saioctl;
371 static  periph_init_t   sainit;
372 static  periph_ctor_t   saregister;
373 static  periph_oninv_t  saoninvalidate;
374 static  periph_dtor_t   sacleanup;
375 static  periph_start_t  sastart;
376 static  void            saasync(void *callback_arg, u_int32_t code,
377                                 struct cam_path *path, void *arg);
378 static  void            sadone(struct cam_periph *periph,
379                                union ccb *start_ccb);
380 static  int             saerror(union ccb *ccb, u_int32_t cam_flags,
381                                 u_int32_t sense_flags);
382 static int              samarkswanted(struct cam_periph *);
383 static int              sacheckeod(struct cam_periph *periph);
384 static int              sagetparams(struct cam_periph *periph,
385                                     sa_params params_to_get,
386                                     u_int32_t *blocksize, u_int8_t *density,
387                                     u_int32_t *numblocks, int *buff_mode,
388                                     u_int8_t *write_protect, u_int8_t *speed,
389                                     int *comp_supported, int *comp_enabled,
390                                     u_int32_t *comp_algorithm,
391                                     sa_comp_t *comp_page);
392 static int              sasetparams(struct cam_periph *periph,
393                                     sa_params params_to_set,
394                                     u_int32_t blocksize, u_int8_t density,
395                                     u_int32_t comp_algorithm,
396                                     u_int32_t sense_flags);
397 static void             saprevent(struct cam_periph *periph, int action);
398 static int              sarewind(struct cam_periph *periph);
399 static int              saspace(struct cam_periph *periph, int count,
400                                 scsi_space_code code);
401 static int              samount(struct cam_periph *, int, cdev_t);
402 static int              saretension(struct cam_periph *periph);
403 static int              sareservereleaseunit(struct cam_periph *periph,
404                                              int reserve);
405 static int              saloadunload(struct cam_periph *periph, int load);
406 static int              saerase(struct cam_periph *periph, int longerase);
407 static int              sawritefilemarks(struct cam_periph *periph,
408                                          int nmarks, int setmarks);
409 static int              sardpos(struct cam_periph *periph, int, u_int32_t *);
410 static int              sasetpos(struct cam_periph *periph, int, u_int32_t *);
411
412
413 static struct periph_driver sadriver =
414 {
415         sainit, "sa",
416         TAILQ_HEAD_INITIALIZER(sadriver.units), /* generation */ 0
417 };
418
419 DATA_SET(periphdriver_set, sadriver);
420
421 /* For 2.2-stable support */
422 #ifndef D_TAPE
423 #define D_TAPE 0
424 #endif
425
426 #define SA_CDEV_MAJOR 14
427
428 static struct dev_ops sa_ops = {
429         { "sa", SA_CDEV_MAJOR, D_TAPE },
430         .d_open =       saopen,
431         .d_close =      saclose,
432         .d_read =       physread,
433         .d_write =      physwrite,
434         .d_ioctl =      saioctl,
435         .d_strategy =   sastrategy,
436 };
437
438 static struct extend_array *saperiphs;
439
440 static int
441 saopen(struct dev_open_args *ap)
442 {
443         cdev_t dev = ap->a_head.a_dev;
444         struct cam_periph *periph;
445         struct sa_softc *softc;
446         int unit;
447         int mode;
448         int density;
449         int error;
450
451         unit = SAUNIT(dev);
452         mode = SAMODE(dev);
453         density = SADENSITY(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         if (SA_IS_CTRL(dev)) {
476                 softc->ctrl_mode = 1;
477                 cam_periph_unlock(periph);
478                 return (0);
479         }
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                  * The function samount ensures media is loaded and ready.
489                  * It also does a device RESERVE if the tape isn't yet mounted.
490                  */
491                 error = samount(periph, ap->a_oflags, dev);
492         }
493
494         if (error) {
495                 cam_periph_release(periph);
496         } else {
497                 saprevent(periph, PR_PREVENT);
498                 softc->flags |= SA_FLAG_OPEN;
499         }
500         cam_periph_unlock(periph);
501         return (error);
502 }
503
504 static int
505 saclose(struct dev_close_args *ap)
506 {
507         cdev_t dev = ap->a_head.a_dev;
508         struct  cam_periph *periph;
509         struct  sa_softc *softc;
510         int     unit, mode, error, writing, tmp;
511         int     closedbits = SA_FLAG_OPEN;
512
513         unit = SAUNIT(dev);
514         mode = SAMODE(dev);
515         periph = cam_extend_get(saperiphs, unit);
516         if (periph == NULL)
517                 return (ENXIO); 
518
519         softc = (struct sa_softc *)periph->softc;
520
521         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE|CAM_DEBUG_INFO,
522             ("saclose(%d): dev=0x%x softc=0x%x\n", unit, unit, softc->flags));
523
524
525         if ((error = cam_periph_lock(periph, 0)) != 0) {
526                 return (error);
527         }
528
529         if (SA_IS_CTRL(dev)) {
530                 softc->ctrl_mode = 0;
531                 cam_periph_release(periph);
532                 cam_periph_unlock(periph);
533                 return (0);
534         }
535
536         /*
537          * Were we writing the tape?
538          */
539         writing = (softc->flags & SA_FLAG_TAPE_WRITTEN) != 0;
540
541         /*
542          * See whether or not we need to write filemarks. If this
543          * fails, we probably have to assume we've lost tape
544          * position.
545          */
546         error = sacheckeod(periph);
547         if (error) {
548                 xpt_print_path(periph->path);
549                 printf("failed to write terminating filemark(s)\n");
550                 softc->flags |= SA_FLAG_TAPE_FROZEN;
551         }
552
553         /*
554          * Whatever we end up doing, allow users to eject tapes from here on.
555          */
556         saprevent(periph, PR_ALLOW);
557
558         /*
559          * Decide how to end...
560          */
561         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
562                 closedbits |= SA_FLAG_TAPE_FROZEN;
563         } else switch (mode) {
564         case SA_MODE_OFFLINE:
565                 /*
566                  * An 'offline' close is an unconditional release of
567                  * frozen && mount conditions, irrespective of whether
568                  * these operations succeeded. The reason for this is
569                  * to allow at least some kind of programmatic way
570                  * around our state getting all fouled up. If somebody
571                  * issues an 'offline' command, that will be allowed
572                  * to clear state.
573                  */
574                 sarewind(periph);
575                 saloadunload(periph, FALSE);
576                 closedbits |= SA_FLAG_TAPE_MOUNTED|SA_FLAG_TAPE_FROZEN;
577                 break;
578         case SA_MODE_REWIND:
579                 /*
580                  * If the rewind fails, return an error- if anyone cares,
581                  * but not overwriting any previous error.
582                  *
583                  * We don't clear the notion of mounted here, but we do
584                  * clear the notion of frozen if we successfully rewound.
585                  */
586                 tmp = sarewind(periph);
587                 if (tmp) {
588                         if (error != 0)
589                                 error = tmp;
590                 } else {
591                         closedbits |= SA_FLAG_TAPE_FROZEN;
592                 }
593                 break;
594         case SA_MODE_NOREWIND:
595                 /*
596                  * If we're not rewinding/unloading the tape, find out
597                  * whether we need to back up over one of two filemarks
598                  * we wrote (if we wrote two filemarks) so that appends
599                  * from this point on will be sane.
600                  */
601                 if (error == 0 && writing && (softc->quirks & SA_QUIRK_2FM)) {
602                         tmp = saspace(periph, -1, SS_FILEMARKS);
603                         if (tmp) {
604                                 xpt_print_path(periph->path);
605                                 printf("unable to backspace over one of double"
606                                    " filemarks at end of tape\n");
607                                 xpt_print_path(periph->path);
608                                 printf("it is possible that this device"
609                                    " needs a SA_QUIRK_1FM quirk set for it\n");
610                                 softc->flags |= SA_FLAG_TAPE_FROZEN;
611                         }
612                 }
613                 break;
614         default:
615                 xpt_print_path(periph->path);
616                 panic("unknown mode 0x%x in saclose\n", mode);
617                 /* NOTREACHED */
618                 break;
619         }
620
621         /*
622          * We wish to note here that there are no more filemarks to be written.
623          */
624         softc->filemarks = 0;
625         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
626
627         /*
628          * And we are no longer open for business.
629          */
630         softc->flags &= ~closedbits;
631
632         /*
633          * Inform users if tape state if frozen....
634          */
635         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
636                 xpt_print_path(periph->path);
637                 printf("tape is now frozen- use an OFFLINE, REWIND or MTEOM "
638                     "command to clear this state.\n");
639         }
640         
641         /* release the device if it is no longer mounted */
642         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0)
643                 sareservereleaseunit(periph, FALSE);
644
645         cam_periph_unlock(periph);
646         cam_periph_release(periph);
647
648         return (error); 
649 }
650
651 /*
652  * Actually translate the requested transfer into one the physical driver
653  * can understand.  The transfer is described by a buf and will include
654  * only one physical transfer.
655  */
656 static int
657 sastrategy(struct dev_strategy_args *ap)
658 {
659         cdev_t dev = ap->a_head.a_dev;
660         struct bio *bio = ap->a_bio;
661         struct buf *bp = bio->bio_buf;
662         struct cam_periph *periph;
663         struct sa_softc *softc;
664         u_int  unit;
665         
666         if (SA_IS_CTRL(dev)) {
667                 bp->b_error = EINVAL;
668                 goto bad;
669         }
670         unit = SAUNIT(dev);
671         periph = cam_extend_get(saperiphs, unit);
672         if (periph == NULL) {
673                 bp->b_error = ENXIO;
674                 goto bad;
675         }
676         softc = (struct sa_softc *)periph->softc;
677
678         crit_enter();
679
680         if (softc->flags & SA_FLAG_INVALID) {
681                 crit_exit();
682                 bp->b_error = ENXIO;
683                 goto bad;
684         }
685
686         if (softc->flags & SA_FLAG_TAPE_FROZEN) {
687                 crit_exit();
688                 bp->b_error = EPERM;
689                 goto bad;
690         }
691
692         crit_exit();
693
694         /*
695          * If it's a null transfer, return immediatly
696          */
697         if (bp->b_bcount == 0)
698                 goto done;
699
700         /* valid request?  */
701         if (softc->flags & SA_FLAG_FIXED) {
702                 /*
703                  * Fixed block device.  The byte count must
704                  * be a multiple of our block size.
705                  */
706                 if (((softc->blk_mask != ~0) &&
707                     ((bp->b_bcount & softc->blk_mask) != 0)) ||
708                     ((softc->blk_mask == ~0) &&
709                     ((bp->b_bcount % softc->min_blk) != 0))) {
710                         xpt_print_path(periph->path);
711                         printf("Invalid request.  Fixed block device "
712                                "requests must be a multiple "
713                                "of %d bytes\n", softc->media_blksize);
714                         bp->b_error = EINVAL;
715                         goto bad;
716                 }
717         } else if ((bp->b_bcount > softc->max_blk) ||
718                    (bp->b_bcount < softc->min_blk) ||
719                    (bp->b_bcount & softc->blk_mask) != 0) {
720
721                 xpt_print_path(periph->path);
722                 printf("Invalid request.  Variable block device "
723                     "requests must be ");
724                 if (softc->blk_mask != 0) {
725                         printf("a multiple of %d ", (0x1 << softc->blk_gran));
726                 }
727                 printf("between %d and %d bytes\n", softc->min_blk,
728                     softc->max_blk);
729                 bp->b_error = EINVAL;
730                 goto bad;
731         }
732         
733         /*
734          * Mask interrupts so that the device cannot be invalidated until
735          * after we are in the queue.  Otherwise, we might not properly
736          * clean up one of the buffers.
737          */
738         crit_enter();
739         
740         /*
741          * Place it at the end of the queue.
742          */
743         bioq_insert_tail(&softc->bio_queue, bio);
744
745         softc->queue_count++;
746         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastrategy: enqueuing a %d "
747             "%s byte %s queue count now %d\n", (int) bp->b_bcount,
748              (softc->flags & SA_FLAG_FIXED)?  "fixed" : "variable",
749              (bp->b_cmd == BUF_CMD_READ)? "read" : "write", softc->queue_count));
750
751         crit_exit();
752         
753         /*
754          * Schedule ourselves for performing the work.
755          */
756         xpt_schedule(periph, 1);
757
758         return(0);
759 bad:
760         bp->b_flags |= B_ERROR;
761 done:
762
763         /*
764          * Correctly set the buf to indicate a completed xfer
765          */
766         bp->b_resid = bp->b_bcount;
767         biodone(bio);
768         return(0);
769 }
770
771 static int
772 saioctl(struct dev_ioctl_args *ap)
773 {
774         cdev_t dev = ap->a_head.a_dev;
775         caddr_t addr = ap->a_data;
776         struct cam_periph *periph;
777         struct sa_softc *softc;
778         scsi_space_code spaceop;
779         int didlockperiph = 0;
780         int unit;
781         int mode;
782         int density;
783         int error = 0;
784
785         unit = SAUNIT(dev);
786         mode = SAMODE(dev);
787         density = SADENSITY(dev);
788         error = 0;              /* shut up gcc */
789         spaceop = 0;            /* shut up gcc */
790
791         periph = cam_extend_get(saperiphs, unit);
792         if (periph == NULL)
793                 return (ENXIO); 
794
795         softc = (struct sa_softc *)periph->softc;
796
797         /*
798          * Check for control mode accesses. We allow MTIOCGET and
799          * MTIOCERRSTAT (but need to be the only one open in order
800          * to clear latched status), and MTSETBSIZE, MTSETDNSTY
801          * and MTCOMP (but need to be the only one accessing this
802          * device to run those).
803          */
804
805         if (SA_IS_CTRL(dev)) {
806                 switch (ap->a_cmd) {
807                 case MTIOCGETEOTMODEL:
808                 case MTIOCGET:
809                         break;
810                 case MTIOCERRSTAT:
811                         /*
812                          * If the periph isn't already locked, lock it
813                          * so our MTIOCERRSTAT can reset latched error stats.
814                          *
815                          * If the periph is already locked, skip it because
816                          * we're just getting status and it'll be up to the
817                          * other thread that has this device open to do
818                          * an MTIOCERRSTAT that would clear latched status.
819                          */
820                         crit_enter();
821                         if ((periph->flags & CAM_PERIPH_LOCKED) == 0) {
822                                 error = cam_periph_lock(periph, PCATCH);
823                                 if (error != 0) {
824                                         crit_exit();
825                                         return (error);
826                                 }
827                                 didlockperiph = 1;
828                         }
829                         crit_exit();
830                         break;
831
832                 case MTIOCSETEOTMODEL:
833                 case MTSETBSIZ:
834                 case MTSETDNSTY:
835                 case MTCOMP:
836                         /*
837                          * We need to acquire the peripheral here rather
838                          * than at open time because we are sharing writable
839                          * access to data structures.
840                          */
841                         crit_enter();
842                         error = cam_periph_lock(periph, PCATCH);
843                         if (error != 0) {
844                                 crit_exit();
845                                 return (error);
846                         }
847                         didlockperiph = 1;
848                         crit_exit();
849                         break;
850
851                 default:
852                         return (EINVAL);
853                 }
854         }
855
856         /*
857          * Find the device that the user is talking about
858          */
859         switch (ap->a_cmd) {
860         case MTIOCGET:
861         {
862                 struct mtget *g = (struct mtget *)addr;
863
864                 /*
865                  * If this isn't the control mode device, actually go out
866                  * and ask the drive again what it's set to.
867                  */
868                 if (!SA_IS_CTRL(dev)) {
869                         u_int8_t write_protect;
870                         int comp_enabled, comp_supported;
871                         error = sagetparams(periph, SA_PARAM_ALL,
872                             &softc->media_blksize, &softc->media_density,
873                             &softc->media_numblks, &softc->buffer_mode,
874                             &write_protect, &softc->speed, &comp_supported,
875                             &comp_enabled, &softc->comp_algorithm, NULL);
876                         if (error)
877                                 break;
878                         if (write_protect)
879                                 softc->flags |= SA_FLAG_TAPE_WP;
880                         else
881                                 softc->flags &= ~SA_FLAG_TAPE_WP;
882                         softc->flags &= ~(SA_FLAG_COMP_SUPP|
883                             SA_FLAG_COMP_ENABLED|SA_FLAG_COMP_UNSUPP);
884                         if (comp_supported) {
885                                 if (softc->saved_comp_algorithm == 0)
886                                         softc->saved_comp_algorithm =
887                                             softc->comp_algorithm;
888                                 softc->flags |= SA_FLAG_COMP_SUPP;
889                                 if (comp_enabled)
890                                         softc->flags |= SA_FLAG_COMP_ENABLED;
891                         } else  
892                                 softc->flags |= SA_FLAG_COMP_UNSUPP;
893                 }
894                 bzero(g, sizeof(struct mtget));
895                 g->mt_type = MT_ISAR;
896                 if (softc->flags & SA_FLAG_COMP_UNSUPP) {
897                         g->mt_comp = MT_COMP_UNSUPP;
898                         g->mt_comp0 = MT_COMP_UNSUPP;
899                         g->mt_comp1 = MT_COMP_UNSUPP;
900                         g->mt_comp2 = MT_COMP_UNSUPP;
901                         g->mt_comp3 = MT_COMP_UNSUPP;
902                 } else {
903                         if ((softc->flags & SA_FLAG_COMP_ENABLED) == 0) {
904                                 g->mt_comp = MT_COMP_DISABLED;
905                         } else {
906                                 g->mt_comp = softc->comp_algorithm;
907                         }
908                         g->mt_comp0 = softc->comp_algorithm;
909                         g->mt_comp1 = softc->comp_algorithm;
910                         g->mt_comp2 = softc->comp_algorithm;
911                         g->mt_comp3 = softc->comp_algorithm;
912                 }
913                 g->mt_density = softc->media_density;
914                 g->mt_density0 = softc->media_density;
915                 g->mt_density1 = softc->media_density;
916                 g->mt_density2 = softc->media_density;
917                 g->mt_density3 = softc->media_density;
918                 g->mt_blksiz = softc->media_blksize;
919                 g->mt_blksiz0 = softc->media_blksize;
920                 g->mt_blksiz1 = softc->media_blksize;
921                 g->mt_blksiz2 = softc->media_blksize;
922                 g->mt_blksiz3 = softc->media_blksize;
923                 g->mt_fileno = softc->fileno;
924                 g->mt_blkno = softc->blkno;
925                 g->mt_dsreg = (short) softc->dsreg;
926                 /*
927                  * Yes, we know that this is likely to overflow
928                  */
929                 if (softc->last_resid_was_io) {
930                         if ((g->mt_resid = (short) softc->last_io_resid) != 0) {
931                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
932                                         softc->last_io_resid = 0;
933                                 }
934                         }
935                 } else {
936                         if ((g->mt_resid = (short)softc->last_ctl_resid) != 0) {
937                                 if (SA_IS_CTRL(dev) == 0 || didlockperiph) {
938                                         softc->last_ctl_resid = 0;
939                                 }
940                         }
941                 }
942                 error = 0;
943                 break;
944         }
945         case MTIOCERRSTAT:
946         {
947                 struct scsi_tape_errors *sep =
948                     &((union mterrstat *)addr)->scsi_errstat;
949
950                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
951                     ("saioctl: MTIOCERRSTAT\n"));
952
953                 bzero(sep, sizeof(*sep));
954                 sep->io_resid = softc->last_io_resid;
955                 bcopy((caddr_t) &softc->last_io_sense, sep->io_sense,
956                     sizeof (sep->io_sense));
957                 bcopy((caddr_t) &softc->last_io_cdb, sep->io_cdb,
958                     sizeof (sep->io_cdb));
959                 sep->ctl_resid = softc->last_ctl_resid;
960                 bcopy((caddr_t) &softc->last_ctl_sense, sep->ctl_sense,
961                     sizeof (sep->ctl_sense));
962                 bcopy((caddr_t) &softc->last_ctl_cdb, sep->ctl_cdb,
963                     sizeof (sep->ctl_cdb));
964
965                 if (SA_IS_CTRL(dev) == 0 || didlockperiph)
966                         bzero((caddr_t) &softc->errinfo,
967                             sizeof (softc->errinfo));
968                 error = 0;
969                 break;
970         }
971         case MTIOCTOP:
972         {
973                 struct mtop *mt;
974                 int    count;
975
976                 mt = (struct mtop *)addr;
977
978                 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
979                          ("saioctl: op=0x%x count=0x%x\n",
980                           mt->mt_op, mt->mt_count));
981
982                 count = mt->mt_count;
983                 switch (mt->mt_op) {
984                 case MTWEOF:    /* write an end-of-file marker */
985                         /*
986                          * We don't need to clear the SA_FLAG_TAPE_WRITTEN
987                          * flag because by keeping track of filemarks
988                          * we have last written we know ehether or not
989                          * we need to write more when we close the device.
990                          */
991                         error = sawritefilemarks(periph, count, FALSE);
992                         break;
993                 case MTWSS:     /* write a setmark */
994                         error = sawritefilemarks(periph, count, TRUE);
995                         break;
996                 case MTBSR:     /* backward space record */
997                 case MTFSR:     /* forward space record */
998                 case MTBSF:     /* backward space file */
999                 case MTFSF:     /* forward space file */
1000                 case MTBSS:     /* backward space setmark */
1001                 case MTFSS:     /* forward space setmark */
1002                 case MTEOD:     /* space to end of recorded medium */
1003                 {
1004                         int nmarks;
1005
1006                         spaceop = SS_FILEMARKS;
1007                         nmarks = softc->filemarks;
1008                         error = sacheckeod(periph);
1009                         if (error) {
1010                                 xpt_print_path(periph->path);
1011                                 printf("EOD check prior to spacing failed\n");
1012                                 softc->flags |= SA_FLAG_EIO_PENDING;
1013                                 break;
1014                         }
1015                         nmarks -= softc->filemarks;
1016                         switch(mt->mt_op) {
1017                         case MTBSR:
1018                                 count = -count;
1019                                 /* FALLTHROUGH */
1020                         case MTFSR:
1021                                 spaceop = SS_BLOCKS;
1022                                 break;
1023                         case MTBSF:
1024                                 count = -count;
1025                                 /* FALLTHROUGH */
1026                         case MTFSF:
1027                                 break;
1028                         case MTBSS:
1029                                 count = -count;
1030                                 /* FALLTHROUGH */
1031                         case MTFSS:
1032                                 spaceop = SS_SETMARKS;
1033                                 break;
1034                         case MTEOD:
1035                                 spaceop = SS_EOD;
1036                                 count = 0;
1037                                 nmarks = 0;
1038                                 break;
1039                         default:
1040                                 error = EINVAL;
1041                                 break;
1042                         }
1043                         if (error)
1044                                 break;
1045
1046                         nmarks = softc->filemarks;
1047                         /*
1048                          * XXX: Why are we checking again?
1049                          */
1050                         error = sacheckeod(periph);
1051                         if (error)
1052                                 break;
1053                         nmarks -= softc->filemarks;
1054                         error = saspace(periph, count - nmarks, spaceop);
1055                         /*
1056                          * At this point, clear that we've written the tape
1057                          * and that we've written any filemarks. We really
1058                          * don't know what the applications wishes to do next-
1059                          * the sacheckeod's will make sure we terminated the
1060                          * tape correctly if we'd been writing, but the next
1061                          * action the user application takes will set again
1062                          * whether we need to write filemarks.
1063                          */
1064                         softc->flags &=
1065                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1066                         softc->filemarks = 0;
1067                         break;
1068                 }
1069                 case MTREW:     /* rewind */
1070                         sacheckeod(periph);
1071                         error = sarewind(periph);
1072                         /* see above */
1073                         softc->flags &=
1074                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1075                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1076                         softc->filemarks = 0;
1077                         break;
1078                 case MTERASE:   /* erase */
1079                         error = saerase(periph, count);
1080                         softc->flags &=
1081                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1082                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1083                         break;
1084                 case MTRETENS:  /* re-tension tape */
1085                         error = saretension(periph);            
1086                         softc->flags &=
1087                             ~(SA_FLAG_TAPE_WRITTEN|SA_FLAG_TAPE_FROZEN);
1088                         softc->flags &= ~SA_FLAG_ERR_PENDING;
1089                         break;
1090                 case MTOFFL:    /* rewind and put the drive offline */
1091
1092                         sacheckeod(periph);
1093                         /* see above */
1094                         softc->flags &= ~SA_FLAG_TAPE_WRITTEN;
1095                         softc->filemarks = 0;
1096
1097                         error = sarewind(periph);
1098                         /* clear the frozen flag anyway */
1099                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1100
1101                         /*
1102                          * Be sure to allow media removal before ejecting.
1103                          */
1104
1105                         saprevent(periph, PR_ALLOW);
1106                         if (error == 0) {
1107                                 error = saloadunload(periph, FALSE);
1108                                 if (error == 0) {
1109                                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1110                                 }
1111                         }
1112                         break;
1113
1114                 case MTNOP:     /* no operation, sets status only */
1115                 case MTCACHE:   /* enable controller cache */
1116                 case MTNOCACHE: /* disable controller cache */
1117                         error = 0;
1118                         break;
1119
1120                 case MTSETBSIZ: /* Set block size for device */
1121
1122                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE, count,
1123                                             0, 0, 0);
1124                         if (error == 0) {
1125                                 softc->last_media_blksize =
1126                                     softc->media_blksize;
1127                                 softc->media_blksize = count;
1128                                 if (count) {
1129                                         softc->flags |= SA_FLAG_FIXED;
1130                                         if (powerof2(count)) {
1131                                                 softc->blk_shift =
1132                                                     ffs(count) - 1;
1133                                                 softc->blk_mask = count - 1;
1134                                         } else {
1135                                                 softc->blk_mask = ~0;
1136                                                 softc->blk_shift = 0;
1137                                         }
1138                                         /*
1139                                          * Make the user's desire 'persistent'.
1140                                          */
1141                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
1142                                         softc->quirks |= SA_QUIRK_FIXED;
1143                                 } else {
1144                                         softc->flags &= ~SA_FLAG_FIXED;
1145                                         if (softc->max_blk == 0) {
1146                                                 softc->max_blk = ~0;
1147                                         }
1148                                         softc->blk_shift = 0;
1149                                         if (softc->blk_gran != 0) {
1150                                                 softc->blk_mask =
1151                                                     softc->blk_gran - 1;
1152                                         } else {
1153                                                 softc->blk_mask = 0;
1154                                         }
1155                                         /*
1156                                          * Make the user's desire 'persistent'.
1157                                          */
1158                                         softc->quirks |= SA_QUIRK_VARIABLE;
1159                                         softc->quirks &= ~SA_QUIRK_FIXED;
1160                                 }
1161                         }
1162                         break;
1163                 case MTSETDNSTY:        /* Set density for device and mode */
1164                         if (count > UCHAR_MAX) {
1165                                 error = EINVAL; 
1166                                 break;
1167                         } else {
1168                                 error = sasetparams(periph, SA_PARAM_DENSITY,
1169                                                     0, count, 0, 0);
1170                         }
1171                         break;
1172                 case MTCOMP:    /* enable compression */
1173                         /*
1174                          * Some devices don't support compression, and
1175                          * don't like it if you ask them for the
1176                          * compression page.
1177                          */
1178                         if ((softc->quirks & SA_QUIRK_NOCOMP) ||
1179                             (softc->flags & SA_FLAG_COMP_UNSUPP)) {
1180                                 error = ENODEV;
1181                                 break;
1182                         }
1183                         error = sasetparams(periph, SA_PARAM_COMPRESSION,
1184                             0, 0, count, SF_NO_PRINT);
1185                         break;
1186                 default:
1187                         error = EINVAL;
1188                 }
1189                 break;
1190         }
1191         case MTIOCIEOT:
1192         case MTIOCEEOT:
1193                 error = 0;
1194                 break;
1195         case MTIOCRDSPOS:
1196                 error = sardpos(periph, 0, (u_int32_t *) addr);
1197                 break;
1198         case MTIOCRDHPOS:
1199                 error = sardpos(periph, 1, (u_int32_t *) addr);
1200                 break;
1201         case MTIOCSLOCATE:
1202                 error = sasetpos(periph, 0, (u_int32_t *) addr);
1203                 break;
1204         case MTIOCHLOCATE:
1205                 error = sasetpos(periph, 1, (u_int32_t *) addr);
1206                 break;
1207         case MTIOCGETEOTMODEL:
1208                 error = 0;
1209                 if (softc->quirks & SA_QUIRK_1FM)
1210                         mode = 1;
1211                 else
1212                         mode = 2;
1213                 *((u_int32_t *) addr) = mode;
1214                 break;
1215         case MTIOCSETEOTMODEL:
1216                 error = 0;
1217                 switch (*((u_int32_t *) addr)) {
1218                 case 1:
1219                         softc->quirks &= ~SA_QUIRK_2FM;
1220                         softc->quirks |= SA_QUIRK_1FM;
1221                         break;
1222                 case 2:
1223                         softc->quirks &= ~SA_QUIRK_1FM;
1224                         softc->quirks |= SA_QUIRK_2FM;
1225                         break;
1226                 default:
1227                         error = EINVAL;
1228                         break;
1229                 }
1230                 break;
1231         default:
1232                 error = cam_periph_ioctl(periph, ap->a_cmd, addr, saerror);
1233                 break;
1234         }
1235
1236         /*
1237          * Check to see if we cleared a frozen state
1238          */
1239         if (error == 0 && (softc->flags & SA_FLAG_TAPE_FROZEN)) {
1240                 switch(ap->a_cmd) {
1241                 case MTIOCRDSPOS:
1242                 case MTIOCRDHPOS:
1243                 case MTIOCSLOCATE:
1244                 case MTIOCHLOCATE:
1245                         softc->fileno = (daddr_t) -1;
1246                         softc->blkno = (daddr_t) -1;
1247                         softc->flags &= ~SA_FLAG_TAPE_FROZEN;
1248                         xpt_print_path(periph->path);
1249                         printf("tape state now unfrozen.\n");
1250                         break;
1251                 default:
1252                         break;
1253                 }
1254         }
1255         if (didlockperiph) {
1256                 cam_periph_unlock(periph);
1257         }
1258         return (error);
1259 }
1260
1261 static void
1262 sainit(void)
1263 {
1264         cam_status status;
1265         struct cam_path *path;
1266
1267         /*
1268          * Create our extend array for storing the devices we attach to.
1269          */
1270         saperiphs = cam_extend_new();
1271         if (saperiphs == NULL) {
1272                 printf("sa: Failed to alloc extend array!\n");
1273                 return;
1274         }
1275         
1276         /*
1277          * Install a global async callback.
1278          */
1279         status = xpt_create_path(&path, NULL, CAM_XPT_PATH_ID,
1280                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
1281
1282         if (status == CAM_REQ_CMP) {
1283                 /* Register the async callbacks of interrest */
1284                 struct ccb_setasync csa; /*
1285                                           * This is an immediate CCB,
1286                                           * so using the stack is OK
1287                                           */
1288                 xpt_setup_ccb(&csa.ccb_h, path, 5);
1289                 csa.ccb_h.func_code = XPT_SASYNC_CB;
1290                 csa.event_enable = AC_FOUND_DEVICE;
1291                 csa.callback = saasync;
1292                 csa.callback_arg = NULL;
1293                 xpt_action((union ccb *)&csa);
1294                 status = csa.ccb_h.status;
1295                 xpt_free_path(path);
1296         }
1297
1298         if (status != CAM_REQ_CMP) {
1299                 printf("sa: Failed to attach master async callback "
1300                        "due to status 0x%x!\n", status);
1301         }
1302 }
1303
1304 static void
1305 saoninvalidate(struct cam_periph *periph)
1306 {
1307         struct sa_softc *softc;
1308         struct buf *q_bp;
1309         struct bio *q_bio;
1310         struct ccb_setasync csa;
1311
1312         softc = (struct sa_softc *)periph->softc;
1313
1314         /*
1315          * De-register any async callbacks.
1316          */
1317         xpt_setup_ccb(&csa.ccb_h, periph->path,
1318                       /* priority */ 5);
1319         csa.ccb_h.func_code = XPT_SASYNC_CB;
1320         csa.event_enable = 0;
1321         csa.callback = saasync;
1322         csa.callback_arg = periph;
1323         xpt_action((union ccb *)&csa);
1324
1325         softc->flags |= SA_FLAG_INVALID;
1326
1327         /*
1328          * We need to be in a critical section here to keep the buffer
1329          * queue from being modified while we traverse it.
1330          */
1331         crit_enter();
1332
1333         /*
1334          * Return all queued I/O with ENXIO.
1335          * XXX Handle any transactions queued to the card
1336          *     with XPT_ABORT_CCB.
1337          */
1338         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL){
1339                 bioq_remove(&softc->bio_queue, q_bio);
1340                 q_bp = q_bio->bio_buf;
1341                 q_bp->b_resid = q_bp->b_bcount;
1342                 q_bp->b_error = ENXIO;
1343                 q_bp->b_flags |= B_ERROR;
1344                 biodone(q_bio);
1345         }
1346         softc->queue_count = 0;
1347         crit_exit();
1348
1349         xpt_print_path(periph->path);
1350         printf("lost device\n");
1351
1352 }
1353
1354 static void
1355 sacleanup(struct cam_periph *periph)
1356 {
1357         struct sa_softc *softc;
1358
1359         softc = (struct sa_softc *)periph->softc;
1360
1361         devstat_remove_entry(&softc->device_stats);
1362
1363         cam_extend_release(saperiphs, periph->unit_number);
1364         xpt_print_path(periph->path);
1365         printf("removing device entry\n");
1366         dev_ops_remove(&sa_ops, SA_UNITMASK, SA_UNIT(periph->unit_number));
1367         kfree(softc, M_DEVBUF);
1368 }
1369
1370 static void
1371 saasync(void *callback_arg, u_int32_t code,
1372         struct cam_path *path, void *arg)
1373 {
1374         struct cam_periph *periph;
1375
1376         periph = (struct cam_periph *)callback_arg;
1377         switch (code) {
1378         case AC_FOUND_DEVICE:
1379         {
1380                 struct ccb_getdev *cgd;
1381                 cam_status status;
1382
1383                 cgd = (struct ccb_getdev *)arg;
1384                 if (cgd == NULL)
1385                         break;
1386
1387                 if (SID_TYPE(&cgd->inq_data) != T_SEQUENTIAL)
1388                         break;
1389
1390                 /*
1391                  * Allocate a peripheral instance for
1392                  * this device and start the probe
1393                  * process.
1394                  */
1395                 status = cam_periph_alloc(saregister, saoninvalidate,
1396                                           sacleanup, sastart,
1397                                           "sa", CAM_PERIPH_BIO, cgd->ccb_h.path,
1398                                           saasync, AC_FOUND_DEVICE, cgd);
1399
1400                 if (status != CAM_REQ_CMP
1401                  && status != CAM_REQ_INPROG)
1402                         printf("saasync: Unable to probe new device "
1403                                 "due to status 0x%x\n", status);
1404                 break;
1405         }
1406         default:
1407                 cam_periph_async(periph, code, path, arg);
1408                 break;
1409         }
1410 }
1411
1412 static cam_status
1413 saregister(struct cam_periph *periph, void *arg)
1414 {
1415         struct sa_softc *softc;
1416         struct ccb_setasync csa;
1417         struct ccb_getdev *cgd;
1418         caddr_t match;
1419         int i;
1420         
1421         cgd = (struct ccb_getdev *)arg;
1422         if (periph == NULL) {
1423                 printf("saregister: periph was NULL!!\n");
1424                 return (CAM_REQ_CMP_ERR);
1425         }
1426
1427         if (cgd == NULL) {
1428                 printf("saregister: no getdev CCB, can't register device\n");
1429                 return (CAM_REQ_CMP_ERR);
1430         }
1431
1432         softc = kmalloc(sizeof (*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
1433         softc->scsi_rev = SID_ANSI_REV(&cgd->inq_data);
1434         softc->state = SA_STATE_NORMAL;
1435         softc->fileno = (daddr_t) -1;
1436         softc->blkno = (daddr_t) -1;
1437
1438         bioq_init(&softc->bio_queue);
1439         periph->softc = softc;
1440         cam_extend_set(saperiphs, periph->unit_number, periph);
1441
1442         /*
1443          * See if this device has any quirks.
1444          */
1445         match = cam_quirkmatch((caddr_t)&cgd->inq_data,
1446                                (caddr_t)sa_quirk_table,
1447                                sizeof(sa_quirk_table)/sizeof(*sa_quirk_table),
1448                                sizeof(*sa_quirk_table), scsi_inquiry_match);
1449
1450         if (match != NULL) {
1451                 softc->quirks = ((struct sa_quirk_entry *)match)->quirks;
1452                 softc->last_media_blksize =
1453                     ((struct sa_quirk_entry *)match)->prefblk;
1454 #ifdef  CAMDEBUG
1455                 xpt_print_path(periph->path);
1456                 printf("found quirk entry %d\n", (int)
1457                     (((struct sa_quirk_entry *) match) - sa_quirk_table));
1458 #endif
1459         } else
1460                 softc->quirks = SA_QUIRK_NONE;
1461
1462         /*
1463          * The SA driver supports a blocksize, but we don't know the
1464          * blocksize until we media is inserted.  So, set a flag to
1465          * indicate that the blocksize is unavailable right now.
1466          */
1467         devstat_add_entry(&softc->device_stats, "sa", periph->unit_number, 0,
1468             DEVSTAT_BS_UNAVAILABLE, SID_TYPE(&cgd->inq_data) |
1469             DEVSTAT_TYPE_IF_SCSI, DEVSTAT_PRIORITY_TAPE);
1470
1471         dev_ops_add(&sa_ops, SA_UNITMASK, SA_UNIT(periph->unit_number));
1472         make_dev(&sa_ops, SAMINOR(SA_CTLDEV,
1473             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1474             0660, "r%s%d.ctl", periph->periph_name, periph->unit_number);
1475
1476         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1477             periph->unit_number, 0, SA_ATYPE_R), UID_ROOT, GID_OPERATOR,
1478             0660, "r%s%d", periph->periph_name, periph->unit_number);
1479
1480         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1481             periph->unit_number, 0, SA_ATYPE_NR), UID_ROOT, GID_OPERATOR,
1482             0660, "nr%s%d", periph->periph_name, periph->unit_number);
1483
1484         make_dev(&sa_ops, SAMINOR(SA_NOT_CTLDEV,
1485             periph->unit_number, 0, SA_ATYPE_ER), UID_ROOT, GID_OPERATOR,
1486             0660, "er%s%d", periph->periph_name, periph->unit_number);
1487
1488         for (i = 0; i < SA_NUM_MODES; i++) {
1489
1490                 make_dev(&sa_ops,
1491                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_R),
1492                     UID_ROOT, GID_OPERATOR, 0660, "r%s%d.%d",
1493                     periph->periph_name, periph->unit_number, i);
1494
1495                 make_dev(&sa_ops,
1496                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_NR),
1497                     UID_ROOT, GID_OPERATOR, 0660, "nr%s%d.%d",
1498                     periph->periph_name, periph->unit_number, i);
1499
1500
1501                 make_dev(&sa_ops,
1502                     SAMINOR(SA_NOT_CTLDEV, periph->unit_number, i, SA_ATYPE_ER),
1503                     UID_ROOT, GID_OPERATOR, 0660, "er%s%d.%d",
1504                     periph->periph_name, periph->unit_number, i);
1505         }
1506
1507         /*
1508          * Add an async callback so that we get
1509          * notified if this device goes away.
1510          */
1511         xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5);
1512         csa.ccb_h.func_code = XPT_SASYNC_CB;
1513         csa.event_enable = AC_LOST_DEVICE;
1514         csa.callback = saasync;
1515         csa.callback_arg = periph;
1516         xpt_action((union ccb *)&csa);
1517
1518         xpt_announce_periph(periph, NULL);
1519
1520         return (CAM_REQ_CMP);
1521 }
1522
1523 static void
1524 sastart(struct cam_periph *periph, union ccb *start_ccb)
1525 {
1526         struct sa_softc *softc;
1527
1528         softc = (struct sa_softc *)periph->softc;
1529
1530         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("sastart"));
1531
1532         
1533         switch (softc->state) {
1534         case SA_STATE_NORMAL:
1535         {
1536                 /* Pull a buffer from the queue and get going on it */          
1537                 struct buf *bp;
1538                 struct bio *bio;
1539
1540                 /*
1541                  * See if there is a buf with work for us to do..
1542                  */
1543                 crit_enter();
1544                 bio = bioq_first(&softc->bio_queue);
1545                 if (periph->immediate_priority <= periph->pinfo.priority) {
1546                         CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
1547                                         ("queuing for immediate ccb\n"));
1548                         Set_CCB_Type(start_ccb, SA_CCB_WAITING);
1549                         SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
1550                                           periph_links.sle);
1551                         periph->immediate_priority = CAM_PRIORITY_NONE;
1552                         crit_exit();
1553                         wakeup(&periph->ccb_list);
1554                 } else if (bio == NULL) {
1555                         crit_exit();
1556                         xpt_release_ccb(start_ccb);
1557                 } else if ((softc->flags & SA_FLAG_ERR_PENDING) != 0) {
1558                         struct bio *done_bio;
1559 again:
1560                         softc->queue_count--;
1561                         bioq_remove(&softc->bio_queue, bio);
1562                         bp = bio->bio_buf;
1563                         bp->b_resid = bp->b_bcount;
1564                         done_bio = bio;
1565                         if ((softc->flags & SA_FLAG_EOM_PENDING) != 0) {
1566                                 /*
1567                                  * We now just clear errors in this case
1568                                  * and let the residual be the notifier.
1569                                  */
1570                                 bp->b_error = 0;
1571                         } else if ((softc->flags & SA_FLAG_EOF_PENDING) != 0) {
1572                                 /*
1573                                  * This can only happen if we're reading
1574                                  * in fixed length mode. In this case,
1575                                  * we dump the rest of the list the
1576                                  * same way.
1577                                  */
1578                                 bp->b_error = 0;
1579                                 if (bioq_first(&softc->bio_queue) != NULL) {
1580                                         biodone(done_bio);
1581                                         goto again;
1582                                 }
1583                         } else if ((softc->flags & SA_FLAG_EIO_PENDING) != 0) {
1584                                 bp->b_error = EIO;
1585                                 bp->b_flags |= B_ERROR;
1586                         }
1587                         bio = bioq_first(&softc->bio_queue);
1588                         /*
1589                          * Only if we have no other buffers queued up
1590                          * do we clear the pending error flag.
1591                          */
1592                         if (bio == NULL)
1593                                 softc->flags &= ~SA_FLAG_ERR_PENDING;
1594                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1595                             ("sastart- ERR_PENDING now 0x%x, bio is %sNULL, "
1596                             "%d more buffers queued up\n",
1597                             (softc->flags & SA_FLAG_ERR_PENDING),
1598                             (bio != NULL)? "not " : " ", softc->queue_count));
1599                         crit_exit();
1600                         xpt_release_ccb(start_ccb);
1601                         biodone(done_bio);
1602                 } else {
1603                         u_int32_t length;
1604
1605                         bioq_remove(&softc->bio_queue, bio);
1606                         bp = bio->bio_buf;
1607                         softc->queue_count--;
1608
1609                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
1610                                 if (softc->blk_shift != 0) {
1611                                         length =
1612                                             bp->b_bcount >> softc->blk_shift;
1613                                 } else if (softc->media_blksize != 0) {
1614                                         length =
1615                                             bp->b_bcount / softc->media_blksize;
1616                                 } else {
1617                                         bp->b_error = EIO;
1618                                         xpt_print_path(periph->path);
1619                                         printf("zero blocksize for "
1620                                             "FIXED length writes?\n");
1621                                         crit_exit();
1622                                         biodone(bio);
1623                                         break;
1624                                 }
1625                                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1626                                     ("Fixed Record Count is %d\n", length));
1627                         } else {
1628                                 length = bp->b_bcount;
1629                                 CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_INFO,
1630                                     ("Variable Record Count is %d\n", length));
1631                         }
1632                         devstat_start_transaction(&softc->device_stats);
1633                         /*
1634                          * Some people have theorized that we should
1635                          * suppress illegal length indication if we are
1636                          * running in variable block mode so that we don't
1637                          * have to request sense every time our requested
1638                          * block size is larger than the written block.
1639                          * The residual information from the ccb allows
1640                          * us to identify this situation anyway.  The only
1641                          * problem with this is that we will not get
1642                          * information about blocks that are larger than
1643                          * our read buffer unless we set the block size
1644                          * in the mode page to something other than 0.
1645                          *
1646                          * I believe that this is a non-issue. If user apps
1647                          * don't adjust their read size to match our record
1648                          * size, that's just life. Anyway, the typical usage
1649                          * would be to issue, e.g., 64KB reads and occasionally
1650                          * have to do deal with 512 byte or 1KB intermediate
1651                          * records.
1652                          */
1653                         softc->dsreg = (bp->b_cmd == BUF_CMD_READ) ?
1654                             MTIO_DSREG_RD : MTIO_DSREG_WR;
1655                         scsi_sa_read_write(&start_ccb->csio, 0, sadone,
1656                             MSG_SIMPLE_Q_TAG, (bp->b_cmd == BUF_CMD_READ) != 0,
1657                             FALSE, (softc->flags & SA_FLAG_FIXED) != 0,
1658                             length, bp->b_data, bp->b_bcount, SSD_FULL_SIZE,
1659                             IO_TIMEOUT);
1660                         start_ccb->ccb_h.ccb_pflags &= ~SA_POSITION_UPDATED;
1661                         Set_CCB_Type(start_ccb, SA_CCB_BUFFER_IO);
1662                         start_ccb->ccb_h.ccb_bio = bio;
1663                         bio = bioq_first(&softc->bio_queue);
1664                         crit_exit();
1665                         xpt_action(start_ccb);
1666                 }
1667                 
1668                 if (bio != NULL) {
1669                         /* Have more work to do, so ensure we stay scheduled */
1670                         xpt_schedule(periph, 1);
1671                 }
1672                 break;
1673         }
1674         case SA_STATE_ABNORMAL:
1675         default:
1676                 panic("state 0x%x in sastart", softc->state);
1677                 break;
1678         }
1679 }
1680
1681
1682 static void
1683 sadone(struct cam_periph *periph, union ccb *done_ccb)
1684 {
1685         struct sa_softc *softc;
1686         struct ccb_scsiio *csio;
1687
1688         softc = (struct sa_softc *)periph->softc;
1689         csio = &done_ccb->csio;
1690         switch (CCB_Type(csio)) {
1691         case SA_CCB_BUFFER_IO:
1692         {
1693                 struct buf *bp;
1694                 struct bio *bio;
1695                 int error;
1696
1697                 softc->dsreg = MTIO_DSREG_REST;
1698                 bio = (struct bio *)done_ccb->ccb_h.ccb_bio;
1699                 bp = bio->bio_buf;
1700                 error = 0;
1701                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1702                         if ((error = saerror(done_ccb, 0, 0)) == ERESTART) {
1703                                 /*
1704                                  * A retry was scheduled, so just return.
1705                                  */
1706                                 return;
1707                         }
1708                 }
1709
1710                 if (error == EIO) {
1711                         struct buf *q_bp;
1712                         struct bio *q_bio;
1713
1714                         /*
1715                          * Catastrophic error. Mark the tape as frozen
1716                          * (we no longer know tape position).
1717                          *
1718                          * Return all queued I/O with EIO, and unfreeze
1719                          * our queue so that future transactions that
1720                          * attempt to fix this problem can get to the
1721                          * device.
1722                          *
1723                          */
1724
1725                         crit_enter();
1726                         softc->flags |= SA_FLAG_TAPE_FROZEN;
1727                         while ((q_bio = bioq_first(&softc->bio_queue)) != NULL) {
1728                                 bioq_remove(&softc->bio_queue, q_bio);
1729                                 q_bp = q_bio->bio_buf;
1730                                 q_bp->b_resid = q_bp->b_bcount;
1731                                 q_bp->b_error = EIO;
1732                                 q_bp->b_flags |= B_ERROR;
1733                                 biodone(q_bio);
1734                         }
1735                         crit_exit();
1736                 }
1737                 if (error != 0) {
1738                         bp->b_resid = bp->b_bcount;
1739                         bp->b_error = error;
1740                         bp->b_flags |= B_ERROR;
1741                         /*
1742                          * In the error case, position is updated in saerror.
1743                          */
1744                 } else {
1745                         bp->b_resid = csio->resid;
1746                         bp->b_error = 0;
1747                         if (csio->resid != 0) {
1748                                 bp->b_flags |= B_ERROR;
1749                         }
1750                         if (bp->b_cmd != BUF_CMD_READ) {
1751                                 softc->flags |= SA_FLAG_TAPE_WRITTEN;
1752                                 softc->filemarks = 0;
1753                         }
1754                         if (!(csio->ccb_h.ccb_pflags & SA_POSITION_UPDATED) &&
1755                             (softc->blkno != (daddr_t) -1)) {
1756                                 if ((softc->flags & SA_FLAG_FIXED) != 0) {
1757                                         u_int32_t l;
1758                                         if (softc->blk_shift != 0) {
1759                                                 l = bp->b_bcount >>
1760                                                         softc->blk_shift;
1761                                         } else {
1762                                                 l = bp->b_bcount /
1763                                                         softc->media_blksize;
1764                                         }
1765                                         softc->blkno += (daddr_t) l;
1766                                 } else {
1767                                         softc->blkno++;
1768                                 }
1769                         }
1770                 }
1771                 /*
1772                  * If we had an error (immediate or pending),
1773                  * release the device queue now.
1774                  */
1775                 if (error || (softc->flags & SA_FLAG_ERR_PENDING))
1776                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1777 #ifdef  CAMDEBUG
1778                 if (error || bp->b_resid) {
1779                         CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
1780                                   ("error %d resid %d count %d\n", error,
1781                                   bp->b_resid, bp->b_bcount));
1782                 }
1783 #endif
1784                 devstat_end_transaction_buf(&softc->device_stats, bp);
1785                 biodone(bio);
1786                 break;
1787         }
1788         case SA_CCB_WAITING:
1789         {
1790                 /* Caller will release the CCB */
1791                 wakeup(&done_ccb->ccb_h.cbfcnp);
1792                 return;
1793         }
1794         }
1795         xpt_release_ccb(done_ccb);
1796 }
1797
1798 /*
1799  * Mount the tape (make sure it's ready for I/O).
1800  */
1801 static int
1802 samount(struct cam_periph *periph, int oflags, cdev_t dev)
1803 {
1804         struct  sa_softc *softc;
1805         union   ccb *ccb;
1806         int     error;
1807
1808         /*
1809          * oflags can be checked for 'kind' of open (read-only check) - later
1810          * dev can be checked for a control-mode or compression open - later
1811          */
1812         UNUSED_PARAMETER(oflags);
1813         UNUSED_PARAMETER(dev);
1814
1815
1816         softc = (struct sa_softc *)periph->softc;
1817
1818         /*
1819          * This should determine if something has happend since the last
1820          * open/mount that would invalidate the mount. We do *not* want
1821          * to retry this command- we just want the status. But we only
1822          * do this if we're mounted already- if we're not mounted,
1823          * we don't care about the unit read state and can instead use
1824          * this opportunity to attempt to reserve the tape unit.
1825          */
1826         
1827         if (softc->flags & SA_FLAG_TAPE_MOUNTED) {
1828                 ccb = cam_periph_getccb(periph, 1);
1829                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1830                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1831                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1832                     &softc->device_stats);
1833                 QFRLS(ccb);
1834                 if (error == ENXIO) {
1835                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1836                         scsi_test_unit_ready(&ccb->csio, 0, sadone,
1837                             MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1838                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1839                             &softc->device_stats);
1840                         QFRLS(ccb);
1841                 } else if (error) {
1842                         /*
1843                          * We don't need to freeze the tape because we
1844                          * will now attempt to rewind/load it.
1845                          */
1846                         softc->flags &= ~SA_FLAG_TAPE_MOUNTED;
1847                         if (CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO)) {
1848                                 xpt_print_path(ccb->ccb_h.path);
1849                                 printf("error %d on TUR in samount\n", error);
1850                         }
1851                 }
1852         } else {
1853                 error = sareservereleaseunit(periph, TRUE);
1854                 if (error) {
1855                         return (error);
1856                 }
1857                 ccb = cam_periph_getccb(periph, 1);
1858                 scsi_test_unit_ready(&ccb->csio, 0, sadone,
1859                     MSG_SIMPLE_Q_TAG, SSD_FULL_SIZE, IO_TIMEOUT);
1860                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1861                     &softc->device_stats);
1862                 QFRLS(ccb);
1863         }
1864
1865         if ((softc->flags & SA_FLAG_TAPE_MOUNTED) == 0) {
1866                 struct scsi_read_block_limits_data *rblim = NULL;
1867                 int comp_enabled, comp_supported;
1868                 u_int8_t write_protect, guessing = 0;
1869
1870                 /*
1871                  * Clear out old state.
1872                  */
1873                 softc->flags &= ~(SA_FLAG_TAPE_WP|SA_FLAG_TAPE_WRITTEN|
1874                                   SA_FLAG_ERR_PENDING|SA_FLAG_COMP_ENABLED|
1875                                   SA_FLAG_COMP_SUPP|SA_FLAG_COMP_UNSUPP);
1876                 softc->filemarks = 0;
1877
1878                 /*
1879                  * *Very* first off, make sure we're loaded to BOT.
1880                  */
1881                 scsi_load_unload(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
1882                     FALSE, FALSE, 1, SSD_FULL_SIZE, REWIND_TIMEOUT);
1883                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1884                     &softc->device_stats);
1885                 QFRLS(ccb);
1886
1887                 /*
1888                  * In case this doesn't work, do a REWIND instead
1889                  */
1890                 if (error) {
1891                         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
1892                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1893                         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1894                                 &softc->device_stats);
1895                         QFRLS(ccb);
1896                 }
1897                 if (error) {
1898                         xpt_release_ccb(ccb);
1899                         goto exit;
1900                 }
1901
1902                 /*
1903                  * Do a dummy test read to force access to the
1904                  * media so that the drive will really know what's
1905                  * there. We actually don't really care what the
1906                  * blocksize on tape is and don't expect to really
1907                  * read a full record.
1908                  */
1909                 rblim = kmalloc(8192, M_TEMP, M_INTWAIT);
1910
1911                 if ((softc->quirks & SA_QUIRK_NODREAD) == 0) {
1912                         scsi_sa_read_write(&ccb->csio, 0, sadone,
1913                             MSG_SIMPLE_Q_TAG, 1, FALSE, 0, 8192,
1914                             (void *) rblim, 8192, SSD_FULL_SIZE,
1915                             IO_TIMEOUT);
1916                         cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
1917                             &softc->device_stats);
1918                         QFRLS(ccb);
1919                         scsi_rewind(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
1920                             FALSE, SSD_FULL_SIZE, REWIND_TIMEOUT);
1921                         error = cam_periph_runccb(ccb, saerror, 0,
1922                             SF_NO_PRINT | SF_RETRY_SELTO | SF_RETRY_UA,
1923                             &softc->device_stats);
1924                         QFRLS(ccb);
1925                         if (error) {
1926                                 xpt_print_path(ccb->ccb_h.path);
1927                                 printf("unable to rewind after test read\n");
1928                                 xpt_release_ccb(ccb);
1929                                 goto exit;
1930                         }
1931                 }
1932
1933                 /*
1934                  * Next off, determine block limits.
1935                  */
1936                 scsi_read_block_limits(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
1937                     rblim, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
1938
1939                 error = cam_periph_runccb(ccb, saerror, 0,
1940                     SF_NO_PRINT | SF_RETRY_UA | SF_RETRY_SELTO,
1941                     &softc->device_stats);
1942                 QFRLS(ccb);
1943                 xpt_release_ccb(ccb);
1944
1945                 if (error != 0) {
1946                         /*
1947                          * If it's less than SCSI-2, READ BLOCK LIMITS is not
1948                          * a MANDATORY command. Anyway- it doesn't matter-
1949                          * we can proceed anyway.
1950                          */
1951                         softc->blk_gran = 0;
1952                         softc->max_blk = ~0;
1953                         softc->min_blk = 0;
1954                 } else {
1955                         if (softc->scsi_rev >= SCSI_REV_3) {
1956                                 softc->blk_gran = RBL_GRAN(rblim);
1957                         } else {
1958                                 softc->blk_gran = 0;
1959                         }
1960                         /*
1961                          * We take max_blk == min_blk to mean a default to
1962                          * fixed mode- but note that whatever we get out of
1963                          * sagetparams below will actually determine whether
1964                          * we are actually *in* fixed mode.
1965                          */
1966                         softc->max_blk = scsi_3btoul(rblim->maximum);
1967                         softc->min_blk = scsi_2btoul(rblim->minimum);
1968
1969
1970                 }
1971                 /*
1972                  * Next, perform a mode sense to determine
1973                  * current density, blocksize, compression etc.
1974                  */
1975                 error = sagetparams(periph, SA_PARAM_ALL,
1976                                     &softc->media_blksize,
1977                                     &softc->media_density,
1978                                     &softc->media_numblks,
1979                                     &softc->buffer_mode, &write_protect,
1980                                     &softc->speed, &comp_supported,
1981                                     &comp_enabled, &softc->comp_algorithm,
1982                                     NULL);
1983
1984                 if (error != 0) {
1985                         /*
1986                          * We could work a little harder here. We could
1987                          * adjust our attempts to get information. It
1988                          * might be an ancient tape drive. If someone
1989                          * nudges us, we'll do that.
1990                          */
1991                         goto exit;
1992                 }
1993
1994                 /*
1995                  * If no quirk has determined that this is a device that is
1996                  * preferred to be in fixed or variable mode, now is the time
1997                  * to find out.
1998                  */
1999                 if ((softc->quirks & (SA_QUIRK_FIXED|SA_QUIRK_VARIABLE)) == 0) {
2000                         guessing = 1;
2001                         /*
2002                          * This could be expensive to find out. Luckily we
2003                          * only need to do this once. If we start out in
2004                          * 'default' mode, try and set ourselves to one
2005                          * of the densities that would determine a wad
2006                          * of other stuff. Go from highest to lowest.
2007                          */
2008                         if (softc->media_density == SCSI_DEFAULT_DENSITY) {
2009                                 int i;
2010                                 static u_int8_t ctry[] = {
2011                                         SCSI_DENSITY_HALFINCH_PE,
2012                                         SCSI_DENSITY_HALFINCH_6250C,
2013                                         SCSI_DENSITY_HALFINCH_6250,
2014                                         SCSI_DENSITY_HALFINCH_1600,
2015                                         SCSI_DENSITY_HALFINCH_800,
2016                                         SCSI_DENSITY_QIC_4GB,
2017                                         SCSI_DENSITY_QIC_2GB,
2018                                         SCSI_DENSITY_QIC_525_320,
2019                                         SCSI_DENSITY_QIC_150,
2020                                         SCSI_DENSITY_QIC_120,
2021                                         SCSI_DENSITY_QIC_24,
2022                                         SCSI_DENSITY_QIC_11_9TRK,
2023                                         SCSI_DENSITY_QIC_11_4TRK,
2024                                         SCSI_DENSITY_QIC_1320,
2025                                         SCSI_DENSITY_QIC_3080,
2026                                         0
2027                                 };
2028                                 for (i = 0; ctry[i]; i++) {
2029                                         error = sasetparams(periph,
2030                                             SA_PARAM_DENSITY, 0, ctry[i],
2031                                             0, SF_NO_PRINT);
2032                                         if (error == 0) {
2033                                                 softc->media_density = ctry[i];
2034                                                 break;
2035                                         }
2036                                 }
2037                         }
2038                         switch (softc->media_density) {
2039                         case SCSI_DENSITY_QIC_11_4TRK:
2040                         case SCSI_DENSITY_QIC_11_9TRK:
2041                         case SCSI_DENSITY_QIC_24:
2042                         case SCSI_DENSITY_QIC_120:
2043                         case SCSI_DENSITY_QIC_150:
2044                         case SCSI_DENSITY_QIC_525_320:
2045                         case SCSI_DENSITY_QIC_1320:
2046                         case SCSI_DENSITY_QIC_3080:
2047                                 softc->quirks &= ~SA_QUIRK_2FM;
2048                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2049                                 softc->last_media_blksize = 512;
2050                                 break;
2051                         case SCSI_DENSITY_QIC_4GB:
2052                         case SCSI_DENSITY_QIC_2GB:
2053                                 softc->quirks &= ~SA_QUIRK_2FM;
2054                                 softc->quirks |= SA_QUIRK_FIXED|SA_QUIRK_1FM;
2055                                 softc->last_media_blksize = 1024;
2056                                 break;
2057                         default:
2058                                 softc->last_media_blksize =
2059                                     softc->media_blksize;
2060                                 softc->quirks |= SA_QUIRK_VARIABLE;
2061                                 break;
2062                         }
2063                 }
2064
2065                 /*
2066                  * If no quirk has determined that this is a device that needs
2067                  * to have 2 Filemarks at EOD, now is the time to find out.
2068                  */
2069
2070                 if ((softc->quirks & SA_QUIRK_2FM) == 0) {
2071                         switch (softc->media_density) {
2072                         case SCSI_DENSITY_HALFINCH_800:
2073                         case SCSI_DENSITY_HALFINCH_1600:
2074                         case SCSI_DENSITY_HALFINCH_6250:
2075                         case SCSI_DENSITY_HALFINCH_6250C:
2076                         case SCSI_DENSITY_HALFINCH_PE:
2077                                 softc->quirks &= ~SA_QUIRK_1FM;
2078                                 softc->quirks |= SA_QUIRK_2FM;
2079                                 break;
2080                         default:
2081                                 break;
2082                         }
2083                 }
2084
2085                 /*
2086                  * Now validate that some info we got makes sense.
2087                  */
2088                 if ((softc->max_blk < softc->media_blksize) ||
2089                     (softc->min_blk > softc->media_blksize &&
2090                     softc->media_blksize)) {
2091                         xpt_print_path(ccb->ccb_h.path);
2092                         printf("BLOCK LIMITS (%d..%d) could not match current "
2093                             "block settings (%d)- adjusting\n", softc->min_blk,
2094                             softc->max_blk, softc->media_blksize);
2095                         softc->max_blk = softc->min_blk =
2096                             softc->media_blksize;
2097                 }
2098
2099                 /*
2100                  * Now put ourselves into the right frame of mind based
2101                  * upon quirks...
2102                  */
2103 tryagain:
2104                 /*
2105                  * If we want to be in FIXED mode and our current blocksize
2106                  * is not equal to our last blocksize (if nonzero), try and
2107                  * set ourselves to this last blocksize (as the 'preferred'
2108                  * block size).  The initial quirkmatch at registry sets the
2109                  * initial 'last' blocksize. If, for whatever reason, this
2110                  * 'last' blocksize is zero, set the blocksize to 512,
2111                  * or min_blk if that's larger.
2112                  */
2113                 if ((softc->quirks & SA_QUIRK_FIXED) &&
2114                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0 &&
2115                     (softc->media_blksize != softc->last_media_blksize)) {
2116                         softc->media_blksize = softc->last_media_blksize;
2117                         if (softc->media_blksize == 0) {
2118                                 softc->media_blksize = 512;
2119                                 if (softc->media_blksize < softc->min_blk) {
2120                                         softc->media_blksize = softc->min_blk;
2121                                 }
2122                         }
2123                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2124                             softc->media_blksize, 0, 0, SF_NO_PRINT);
2125                         if (error) {
2126                                 xpt_print_path(ccb->ccb_h.path);
2127                                 printf("unable to set fixed blocksize to %d\n",
2128                                      softc->media_blksize);
2129                                 goto exit;
2130                         }
2131                 }
2132
2133                 if ((softc->quirks & SA_QUIRK_VARIABLE) && 
2134                     (softc->media_blksize != 0)) {
2135                         softc->last_media_blksize = softc->media_blksize;
2136                         softc->media_blksize = 0;
2137                         error = sasetparams(periph, SA_PARAM_BLOCKSIZE,
2138                             0, 0, 0, SF_NO_PRINT);
2139                         if (error) {
2140                                 /*
2141                                  * If this fails and we were guessing, just
2142                                  * assume that we got it wrong and go try
2143                                  * fixed block mode. Don't even check against
2144                                  * density code at this point.
2145                                  */
2146                                 if (guessing) {
2147                                         softc->quirks &= ~SA_QUIRK_VARIABLE;
2148                                         softc->quirks |= SA_QUIRK_FIXED;
2149                                         if (softc->last_media_blksize == 0)
2150                                                 softc->last_media_blksize = 512;
2151                                         goto tryagain;
2152                                 }
2153                                 xpt_print_path(ccb->ccb_h.path);
2154                                 printf("unable to set variable blocksize\n");
2155                                 goto exit;
2156                         }
2157                 }
2158
2159                 /*
2160                  * Now that we have the current block size,
2161                  * set up some parameters for sastart's usage.
2162                  */
2163                 if (softc->media_blksize) {
2164                         softc->flags |= SA_FLAG_FIXED;
2165                         if (powerof2(softc->media_blksize)) {
2166                                 softc->blk_shift =
2167                                     ffs(softc->media_blksize) - 1;
2168                                 softc->blk_mask = softc->media_blksize - 1;
2169                         } else {
2170                                 softc->blk_mask = ~0;
2171                                 softc->blk_shift = 0;
2172                         }
2173                 } else {
2174                         /*
2175                          * The SCSI-3 spec allows 0 to mean "unspecified".
2176                          * The SCSI-1 spec allows 0 to mean 'infinite'.
2177                          *
2178                          * Either works here.
2179                          */
2180                         if (softc->max_blk == 0) {
2181                                 softc->max_blk = ~0;
2182                         }
2183                         softc->blk_shift = 0;
2184                         if (softc->blk_gran != 0) {
2185                                 softc->blk_mask = softc->blk_gran - 1;
2186                         } else {
2187                                 softc->blk_mask = 0;
2188                         }
2189                 }
2190
2191                 if (write_protect) 
2192                         softc->flags |= SA_FLAG_TAPE_WP;
2193
2194                 if (comp_supported) {
2195                         if (softc->saved_comp_algorithm == 0)
2196                                 softc->saved_comp_algorithm =
2197                                     softc->comp_algorithm;
2198                         softc->flags |= SA_FLAG_COMP_SUPP;
2199                         if (comp_enabled)
2200                                 softc->flags |= SA_FLAG_COMP_ENABLED;
2201                 } else
2202                         softc->flags |= SA_FLAG_COMP_UNSUPP;
2203
2204                 if ((softc->buffer_mode == SMH_SA_BUF_MODE_NOBUF) &&
2205                     (softc->quirks & SA_QUIRK_NO_MODESEL) == 0) {
2206                         error = sasetparams(periph, SA_PARAM_BUFF_MODE, 0,
2207                             0, 0, SF_NO_PRINT);
2208                         if (error == 0) {
2209                                 softc->buffer_mode = SMH_SA_BUF_MODE_SIBUF;
2210                         } else {
2211                                 xpt_print_path(ccb->ccb_h.path);
2212                                 printf("unable to set buffered mode\n");
2213                         }
2214                         error = 0;      /* not an error */
2215                 }
2216
2217
2218                 if (error == 0) {
2219                         softc->flags |= SA_FLAG_TAPE_MOUNTED;
2220                 }
2221 exit:
2222                 if (rblim != NULL)
2223                         kfree(rblim, M_TEMP);
2224
2225                 if (error != 0) {
2226                         softc->dsreg = MTIO_DSREG_NIL;
2227                 } else {
2228                         softc->fileno = softc->blkno = 0;
2229                         softc->dsreg = MTIO_DSREG_REST;
2230                 }
2231 #ifdef  SA_1FM_AT_EOD
2232                 if ((softc->quirks & SA_QUIRK_2FM) == 0)
2233                         softc->quirks |= SA_QUIRK_1FM;
2234 #else
2235                 if ((softc->quirks & SA_QUIRK_1FM) == 0)
2236                         softc->quirks |= SA_QUIRK_2FM;
2237 #endif
2238         } else
2239                 xpt_release_ccb(ccb);
2240
2241         /*
2242          * If we return an error, we're not mounted any more,
2243          * so release any device reservation.
2244          */
2245         if (error != 0) {
2246                 sareservereleaseunit(periph, FALSE);
2247         } else {
2248                 /*
2249                  * Clear I/O residual.
2250                  */
2251                 softc->last_io_resid = 0;
2252                 softc->last_ctl_resid = 0;
2253         }
2254         return (error);
2255 }
2256
2257 /*
2258  * How many filemarks do we need to write if we were to terminate the
2259  * tape session right now? Note that this can be a negative number
2260  */
2261
2262 static int
2263 samarkswanted(struct cam_periph *periph)
2264 {
2265         int     markswanted;
2266         struct  sa_softc *softc;
2267
2268         softc = (struct sa_softc *)periph->softc;
2269         markswanted = 0;
2270         if ((softc->flags & SA_FLAG_TAPE_WRITTEN) != 0) {
2271                 markswanted++;
2272                 if (softc->quirks & SA_QUIRK_2FM)
2273                         markswanted++;
2274         }
2275         markswanted -= softc->filemarks;
2276         return (markswanted);
2277 }
2278
2279 static int
2280 sacheckeod(struct cam_periph *periph)
2281 {
2282         int     error;
2283         int     markswanted;
2284         struct  sa_softc *softc;
2285
2286         softc = (struct sa_softc *)periph->softc;
2287         markswanted = samarkswanted(periph);
2288
2289         if (markswanted > 0) {
2290                 error = sawritefilemarks(periph, markswanted, FALSE);
2291         } else {
2292                 error = 0;
2293         }
2294         return (error);
2295 }
2296
2297 static int
2298 saerror(union ccb *ccb, u_int32_t cflgs, u_int32_t sflgs)
2299 {
2300         static const char *toobig =
2301             "%d-byte tape record bigger than supplied buffer\n";
2302         struct  cam_periph *periph;
2303         struct  sa_softc *softc;
2304         struct  ccb_scsiio *csio;
2305         struct  scsi_sense_data *sense;
2306         u_int32_t resid = 0;
2307         int32_t info = 0;
2308         cam_status status;
2309         int error_code, sense_key, asc, ascq, error, aqvalid;
2310
2311         periph = xpt_path_periph(ccb->ccb_h.path);
2312         softc = (struct sa_softc *)periph->softc;
2313         csio = &ccb->csio;
2314         sense = &csio->sense_data;
2315         scsi_extract_sense(sense, &error_code, &sense_key, &asc, &ascq);
2316         aqvalid = sense->extra_len >= 6;
2317         error = 0;
2318
2319         status = csio->ccb_h.status & CAM_STATUS_MASK;
2320
2321         /*
2322          * Calculate/latch up, any residuals... We do this in a funny 2-step
2323          * so we can print stuff here if we have CAM_DEBUG enabled for this
2324          * unit.
2325          */
2326         if (status == CAM_SCSI_STATUS_ERROR) {
2327                 if ((sense->error_code & SSD_ERRCODE_VALID) != 0) {
2328                         info = (int32_t) scsi_4btoul(sense->info);
2329                         resid = info;
2330                         if ((softc->flags & SA_FLAG_FIXED) != 0)
2331                                 resid *= softc->media_blksize;
2332                 } else {
2333                         resid = csio->dxfer_len;
2334                         info = resid;
2335                         if ((softc->flags & SA_FLAG_FIXED) != 0) {
2336                                 if (softc->media_blksize)
2337                                         info /= softc->media_blksize;
2338                         }
2339                 }
2340                 if (CCB_Type(csio) == SA_CCB_BUFFER_IO) {
2341                         bcopy((caddr_t) sense, (caddr_t) &softc->last_io_sense,
2342                             sizeof (struct scsi_sense_data));
2343                         bcopy(csio->cdb_io.cdb_bytes, softc->last_io_cdb,
2344                             (int) csio->cdb_len);
2345                         softc->last_io_resid = resid;
2346                         softc->last_resid_was_io = 1;
2347                 } else {
2348                         bcopy((caddr_t) sense, (caddr_t) &softc->last_ctl_sense,
2349                             sizeof (struct scsi_sense_data));
2350                         bcopy(csio->cdb_io.cdb_bytes, softc->last_ctl_cdb,
2351                             (int) csio->cdb_len);
2352                         softc->last_ctl_resid = resid;
2353                         softc->last_resid_was_io = 0;
2354                 }
2355                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("CDB[0]=0x%x Key 0x%x "
2356                     "ASC/ASCQ 0x%x/0x%x CAM STATUS 0x%x flags 0x%x resid %d "
2357                     "dxfer_len %d\n", csio->cdb_io.cdb_bytes[0] & 0xff,
2358                     sense_key, asc, ascq, status,
2359                     sense->flags & ~SSD_KEY_RESERVED, resid, csio->dxfer_len));
2360         } else {
2361                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
2362                     ("Cam Status 0x%x\n", status));
2363         }
2364
2365         switch (status) {
2366         case CAM_REQ_CMP:
2367                 return (0);
2368         case CAM_SCSI_STATUS_ERROR:
2369                 /*
2370                  * If a read/write command, we handle it here.
2371                  */
2372                 if (CCB_Type(csio) != SA_CCB_WAITING) {
2373                         break;
2374                 }
2375                 /*
2376                  * If this was just EOM/EOP, Filemark, Setmark or ILI detected
2377                  * on a non read/write command, we assume it's not an error
2378                  * and propagate the residule and return.
2379                  */
2380                 if ((aqvalid && asc == 0 && ascq > 0 && ascq <= 5) ||
2381                     (aqvalid == 0 && sense_key == SSD_KEY_NO_SENSE)) {
2382                         csio->resid = resid;
2383                         QFRLS(ccb);
2384                         return (0);
2385                 }
2386                 /*
2387                  * Otherwise, we let the common code handle this.
2388                  */
2389                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2390
2391         /*
2392          * XXX: To Be Fixed
2393          * We cannot depend upon CAM honoring retry counts for these.
2394          */
2395         case CAM_SCSI_BUS_RESET:
2396         case CAM_BDR_SENT:
2397                 if (ccb->ccb_h.retry_count <= 0) {
2398                         return (EIO);
2399                         break;
2400                 }
2401                 /* FALLTHROUGH */
2402         default:
2403                 return (cam_periph_error(ccb, cflgs, sflgs, &softc->saved_ccb));
2404         }
2405
2406         /*
2407          * Handle filemark, end of tape, mismatched record sizes....
2408          * From this point out, we're only handling read/write cases.
2409          * Handle writes && reads differently.
2410          */
2411
2412         if (csio->cdb_io.cdb_bytes[0] == SA_WRITE) {
2413                 if (sense_key == SSD_KEY_VOLUME_OVERFLOW) {
2414                         csio->resid = resid;
2415                         error = ENOSPC;
2416                 } else if (sense->flags & SSD_EOM) {
2417                         softc->flags |= SA_FLAG_EOM_PENDING;
2418                         /*
2419                          * Grotesque as it seems, the few times
2420                          * I've actually seen a non-zero resid,
2421                          * the tape drive actually lied and had
2422                          * writtent all the data!.
2423                          */
2424                         csio->resid = 0;
2425                 }
2426         } else {
2427                 csio->resid = resid;
2428                 if (sense_key == SSD_KEY_BLANK_CHECK) {
2429                         if (softc->quirks & SA_QUIRK_1FM) {
2430                                 error = 0;
2431                                 softc->flags |= SA_FLAG_EOM_PENDING;
2432                         } else {
2433                                 error = EIO;
2434                         }
2435                 } else if (sense->flags & SSD_FILEMARK) {
2436                         if (softc->flags & SA_FLAG_FIXED) {
2437                                 error = -1;
2438                                 softc->flags |= SA_FLAG_EOF_PENDING;
2439                         }
2440                         /*
2441                          * Unconditionally, if we detected a filemark on a read,
2442                          * mark that we've run moved a file ahead.
2443                          */
2444                         if (softc->fileno != (daddr_t) -1) {
2445                                 softc->fileno++;
2446                                 softc->blkno = 0;
2447                                 csio->ccb_h.ccb_pflags |= SA_POSITION_UPDATED;
2448                         }
2449                 }
2450         }
2451
2452         /*
2453          * Incorrect Length usually applies to read, but can apply to writes.
2454          */
2455         if (error == 0 && (sense->flags & SSD_ILI)) {
2456                 if (info < 0) {
2457                         xpt_print_path(csio->ccb_h.path);
2458                         printf(toobig, csio->dxfer_len - info);
2459                         csio->resid = csio->dxfer_len;
2460                         error = EIO;
2461                 } else {
2462                         csio->resid = resid;
2463                         if (softc->flags & SA_FLAG_FIXED) {
2464                                 softc->flags |= SA_FLAG_EIO_PENDING;
2465                         }
2466                         /*
2467                          * Bump the block number if we hadn't seen a filemark.
2468                          * Do this independent of errors (we've moved anyway).
2469                          */
2470                         if ((sense->flags & SSD_FILEMARK) == 0) {
2471                                 if (softc->blkno != (daddr_t) -1) {
2472                                         softc->blkno++;
2473                                         csio->ccb_h.ccb_pflags |=
2474                                            SA_POSITION_UPDATED;
2475                                 }
2476                         }
2477                 }
2478         }
2479
2480         if (error <= 0) {
2481                 /*
2482                  * Unfreeze the queue if frozen as we're not returning anything
2483                  * to our waiters that would indicate an I/O error has occurred
2484                  * (yet).
2485                  */
2486                 QFRLS(ccb);
2487                 error = 0;
2488         }
2489         return (error);
2490 }
2491
2492 static int
2493 sagetparams(struct cam_periph *periph, sa_params params_to_get,
2494             u_int32_t *blocksize, u_int8_t *density, u_int32_t *numblocks,
2495             int *buff_mode, u_int8_t *write_protect, u_int8_t *speed,
2496             int *comp_supported, int *comp_enabled, u_int32_t *comp_algorithm,
2497             sa_comp_t *tcs)
2498 {
2499         union ccb *ccb;
2500         void *mode_buffer;
2501         struct scsi_mode_header_6 *mode_hdr;
2502         struct scsi_mode_blk_desc *mode_blk;
2503         int mode_buffer_len;
2504         struct sa_softc *softc;
2505         u_int8_t cpage;
2506         int error;
2507         cam_status status;
2508
2509         softc = (struct sa_softc *)periph->softc;
2510         ccb = cam_periph_getccb(periph, 1);
2511         if (softc->quirks & SA_QUIRK_NO_CPAGE)
2512                 cpage = SA_DEVICE_CONFIGURATION_PAGE;
2513         else
2514                 cpage = SA_DATA_COMPRESSION_PAGE;
2515
2516 retry:
2517         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2518
2519         if (params_to_get & SA_PARAM_COMPRESSION) {
2520                 if (softc->quirks & SA_QUIRK_NOCOMP) {
2521                         *comp_supported = FALSE;
2522                         params_to_get &= ~SA_PARAM_COMPRESSION;
2523                 } else
2524                         mode_buffer_len += sizeof (sa_comp_t);
2525         }
2526
2527         mode_buffer = kmalloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2528         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2529         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2530
2531         /* it is safe to retry this */
2532         scsi_mode_sense(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2533             SMS_PAGE_CTRL_CURRENT, (params_to_get & SA_PARAM_COMPRESSION) ?
2534             cpage : SMS_VENDOR_SPECIFIC_PAGE, mode_buffer, mode_buffer_len,
2535             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2536
2537         error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2538             &softc->device_stats);
2539         QFRLS(ccb);
2540
2541         status = ccb->ccb_h.status & CAM_STATUS_MASK;
2542
2543         if (error == EINVAL && (params_to_get & SA_PARAM_COMPRESSION) != 0) {
2544                 /*
2545                  * Hmm. Let's see if we can try another page...
2546                  * If we've already done that, give up on compression
2547                  * for this device and remember this for the future
2548                  * and attempt the request without asking for compression
2549                  * info.
2550                  */
2551                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2552                         cpage = SA_DEVICE_CONFIGURATION_PAGE;
2553                         goto retry;
2554                 }
2555                 softc->quirks |= SA_QUIRK_NOCOMP;
2556                 kfree(mode_buffer, M_TEMP);
2557                 goto retry;
2558         } else if (status == CAM_SCSI_STATUS_ERROR) {
2559                 /* Tell the user about the fatal error. */
2560                 scsi_sense_print(&ccb->csio);
2561                 goto sagetparamsexit;
2562         }
2563
2564         /*
2565          * If the user only wants the compression information, and
2566          * the device doesn't send back the block descriptor, it's
2567          * no big deal.  If the user wants more than just
2568          * compression, though, and the device doesn't pass back the
2569          * block descriptor, we need to send another mode sense to
2570          * get the block descriptor.
2571          */
2572         if ((mode_hdr->blk_desc_len == 0) &&
2573             (params_to_get & SA_PARAM_COMPRESSION) &&
2574             (params_to_get & ~(SA_PARAM_COMPRESSION))) {
2575
2576                 /*
2577                  * Decrease the mode buffer length by the size of
2578                  * the compression page, to make sure the data
2579                  * there doesn't get overwritten.
2580                  */
2581                 mode_buffer_len -= sizeof (sa_comp_t);
2582
2583                 /*
2584                  * Now move the compression page that we presumably
2585                  * got back down the memory chunk a little bit so
2586                  * it doesn't get spammed.
2587                  */
2588                 bcopy(&mode_hdr[0], &mode_hdr[1], sizeof (sa_comp_t));
2589                 bzero(&mode_hdr[0], sizeof (mode_hdr[0]));
2590
2591                 /*
2592                  * Now, we issue another mode sense and just ask
2593                  * for the block descriptor, etc.
2594                  */
2595
2596                 scsi_mode_sense(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
2597                     SMS_PAGE_CTRL_CURRENT, SMS_VENDOR_SPECIFIC_PAGE,
2598                     mode_buffer, mode_buffer_len, SSD_FULL_SIZE,
2599                     SCSIOP_TIMEOUT);
2600
2601                 error = cam_periph_runccb(ccb, saerror, 0, SF_NO_PRINT,
2602                     &softc->device_stats);
2603                 QFRLS(ccb);
2604
2605                 if (error != 0)
2606                         goto sagetparamsexit;
2607         }
2608
2609         if (params_to_get & SA_PARAM_BLOCKSIZE)
2610                 *blocksize = scsi_3btoul(mode_blk->blklen);
2611
2612         if (params_to_get & SA_PARAM_NUMBLOCKS)
2613                 *numblocks = scsi_3btoul(mode_blk->nblocks);
2614
2615         if (params_to_get & SA_PARAM_BUFF_MODE)
2616                 *buff_mode = mode_hdr->dev_spec & SMH_SA_BUF_MODE_MASK;
2617
2618         if (params_to_get & SA_PARAM_DENSITY)
2619                 *density = mode_blk->density;
2620
2621         if (params_to_get & SA_PARAM_WP)
2622                 *write_protect = (mode_hdr->dev_spec & SMH_SA_WP)? TRUE : FALSE;
2623
2624         if (params_to_get & SA_PARAM_SPEED)
2625                 *speed = mode_hdr->dev_spec & SMH_SA_SPEED_MASK;
2626
2627         if (params_to_get & SA_PARAM_COMPRESSION) {
2628                 sa_comp_t *ntcs = (sa_comp_t *) &mode_blk[1];
2629                 if (cpage == SA_DATA_COMPRESSION_PAGE) {
2630                         struct scsi_data_compression_page *cp = &ntcs->dcomp;
2631                         *comp_supported =
2632                             (cp->dce_and_dcc & SA_DCP_DCC)? TRUE : FALSE;
2633                         *comp_enabled =
2634                             (cp->dce_and_dcc & SA_DCP_DCE)? TRUE : FALSE;
2635                         *comp_algorithm = scsi_4btoul(cp->comp_algorithm);
2636                 } else {
2637                         struct scsi_dev_conf_page *cp = &ntcs->dconf;
2638                         /*
2639                          * We don't really know whether this device supports
2640                          * Data Compression if the the algorithm field is
2641                          * zero. Just say we do.
2642                          */
2643                         *comp_supported = TRUE;
2644                         *comp_enabled =
2645                             (cp->sel_comp_alg != SA_COMP_NONE)? TRUE : FALSE;
2646                         *comp_algorithm = cp->sel_comp_alg;
2647                 }
2648                 if (tcs != NULL)
2649                         bcopy(ntcs, tcs, sizeof (sa_comp_t));
2650         }
2651
2652         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2653                 int idx;
2654                 char *xyz = mode_buffer;
2655                 xpt_print_path(periph->path);
2656                 printf("Mode Sense Data=");
2657                 for (idx = 0; idx < mode_buffer_len; idx++)
2658                         printf(" 0x%02x", xyz[idx] & 0xff);
2659                 printf("\n");
2660         }
2661
2662 sagetparamsexit:
2663
2664         xpt_release_ccb(ccb);
2665         kfree(mode_buffer, M_TEMP);
2666         return (error);
2667 }
2668
2669 /*
2670  * The purpose of this function is to set one of four different parameters
2671  * for a tape drive:
2672  *      - blocksize
2673  *      - density
2674  *      - compression / compression algorithm
2675  *      - buffering mode
2676  *
2677  * The assumption is that this will be called from saioctl(), and therefore
2678  * from a process context.  Thus the waiting malloc calls below.  If that
2679  * assumption ever changes, the malloc calls should be changed to be
2680  * NOWAIT mallocs.
2681  *
2682  * Any or all of the four parameters may be set when this function is
2683  * called.  It should handle setting more than one parameter at once.
2684  */
2685 static int
2686 sasetparams(struct cam_periph *periph, sa_params params_to_set,
2687             u_int32_t blocksize, u_int8_t density, u_int32_t calg,
2688             u_int32_t sense_flags)
2689 {
2690         struct sa_softc *softc;
2691         u_int32_t current_blocksize;
2692         u_int32_t current_calg;
2693         u_int8_t current_density;
2694         u_int8_t current_speed;
2695         int comp_enabled, comp_supported;
2696         void *mode_buffer;
2697         int mode_buffer_len;
2698         struct scsi_mode_header_6 *mode_hdr;
2699         struct scsi_mode_blk_desc *mode_blk;
2700         sa_comp_t *ccomp, *cpage;
2701         int buff_mode;
2702         union ccb *ccb = NULL;
2703         int error;
2704
2705         softc = (struct sa_softc *)periph->softc;
2706
2707         ccomp = kmalloc(sizeof (sa_comp_t), M_TEMP, M_INTWAIT);
2708
2709         /*
2710          * Since it doesn't make sense to set the number of blocks, or
2711          * write protection, we won't try to get the current value.  We
2712          * always want to get the blocksize, so we can set it back to the
2713          * proper value.
2714          */
2715         error = sagetparams(periph,
2716             params_to_set | SA_PARAM_BLOCKSIZE | SA_PARAM_SPEED,
2717             &current_blocksize, &current_density, NULL, &buff_mode, NULL,
2718             &current_speed, &comp_supported, &comp_enabled,
2719             &current_calg, ccomp);
2720
2721         if (error != 0) {
2722                 kfree(ccomp, M_TEMP);
2723                 return (error);
2724         }
2725
2726         mode_buffer_len = sizeof(*mode_hdr) + sizeof(*mode_blk);
2727         if (params_to_set & SA_PARAM_COMPRESSION)
2728                 mode_buffer_len += sizeof (sa_comp_t);
2729
2730         mode_buffer = kmalloc(mode_buffer_len, M_TEMP, M_INTWAIT | M_ZERO);
2731
2732         mode_hdr = (struct scsi_mode_header_6 *)mode_buffer;
2733         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2734
2735         ccb = cam_periph_getccb(periph, 1);
2736
2737 retry:
2738
2739         if (params_to_set & SA_PARAM_COMPRESSION) {
2740                 if (mode_blk) {
2741                         cpage = (sa_comp_t *)&mode_blk[1];
2742                 } else {
2743                         cpage = (sa_comp_t *)&mode_hdr[1];
2744                 }
2745                 bcopy(ccomp, cpage, sizeof (sa_comp_t));
2746                 cpage->hdr.pagecode &= ~0x80;
2747         } else
2748                 cpage = NULL;
2749
2750         /*
2751          * If the caller wants us to set the blocksize, use the one they
2752          * pass in.  Otherwise, use the blocksize we got back from the
2753          * mode select above.
2754          */
2755         if (mode_blk) {
2756                 if (params_to_set & SA_PARAM_BLOCKSIZE)
2757                         scsi_ulto3b(blocksize, mode_blk->blklen);
2758                 else
2759                         scsi_ulto3b(current_blocksize, mode_blk->blklen);
2760
2761                 /*
2762                  * Set density if requested, else preserve old density.
2763                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2764                  * devices, else density we've latched up in our softc.
2765                  */
2766                 if (params_to_set & SA_PARAM_DENSITY) {
2767                         mode_blk->density = density;
2768                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2769                         mode_blk->density = SCSI_SAME_DENSITY;
2770                 } else {
2771                         mode_blk->density = softc->media_density;
2772                 }
2773         }
2774
2775         /*
2776          * For mode selects, these two fields must be zero.
2777          */
2778         mode_hdr->data_length = 0;
2779         mode_hdr->medium_type = 0;
2780
2781         /* set the speed to the current value */
2782         mode_hdr->dev_spec = current_speed;
2783
2784         /* set single-initiator buffering mode */
2785         mode_hdr->dev_spec |= SMH_SA_BUF_MODE_SIBUF;
2786
2787         if (mode_blk)
2788                 mode_hdr->blk_desc_len = sizeof(struct scsi_mode_blk_desc);
2789         else
2790                 mode_hdr->blk_desc_len = 0;
2791
2792         /*
2793          * First, if the user wants us to set the compression algorithm or
2794          * just turn compression on, check to make sure that this drive
2795          * supports compression.
2796          */
2797         if (params_to_set & SA_PARAM_COMPRESSION) {
2798                 /*
2799                  * If the compression algorithm is 0, disable compression.
2800                  * If the compression algorithm is non-zero, enable
2801                  * compression and set the compression type to the
2802                  * specified compression algorithm, unless the algorithm is
2803                  * MT_COMP_ENABLE.  In that case, we look at the
2804                  * compression algorithm that is currently set and if it is
2805                  * non-zero, we leave it as-is.  If it is zero, and we have
2806                  * saved a compression algorithm from a time when
2807                  * compression was enabled before, set the compression to
2808                  * the saved value.
2809                  */
2810                 switch (ccomp->hdr.pagecode & ~0x80) {
2811                 case SA_DATA_COMPRESSION_PAGE:
2812                 if (ccomp->dcomp.dce_and_dcc & SA_DCP_DCC) {
2813                         struct scsi_data_compression_page *dcp = &cpage->dcomp;
2814                         if (calg == 0) {
2815                                 /*
2816                                  * Disable compression, but leave the
2817                                  * decompression and the capability bit
2818                                  * alone.
2819                                  */
2820                                 dcp->dce_and_dcc = SA_DCP_DCC;
2821                                 dcp->dde_and_red |= SA_DCP_DDE;
2822                                 break;
2823                         }
2824                         /* enable compression && decompression */
2825                         dcp->dce_and_dcc = SA_DCP_DCE | SA_DCP_DCC;
2826                         dcp->dde_and_red |= SA_DCP_DDE;
2827                         /*
2828                          * If there, use compression algorithm from caller.
2829                          * Otherwise, if there's a saved compression algorithm
2830                          * and there is no current algorithm, use the saved
2831                          * algorithm. Else parrot back what we got and hope
2832                          * for the best.
2833                          */
2834                         if (calg != MT_COMP_ENABLE) {
2835                                 scsi_ulto4b(calg, dcp->comp_algorithm);
2836                                 scsi_ulto4b(calg, dcp->decomp_algorithm);
2837                         } else if (scsi_4btoul(dcp->comp_algorithm) == 0 &&
2838                             softc->saved_comp_algorithm != 0) {
2839                                 scsi_ulto4b(softc->saved_comp_algorithm,
2840                                     dcp->comp_algorithm);
2841                                 scsi_ulto4b(softc->saved_comp_algorithm,
2842                                     dcp->decomp_algorithm);
2843                         }
2844                         break;
2845                 }
2846                 case SA_DEVICE_CONFIGURATION_PAGE:
2847                 {
2848                         struct scsi_dev_conf_page *dcp = &cpage->dconf;
2849                         if (calg == 0) {
2850                                 dcp->sel_comp_alg = SA_COMP_NONE;
2851                                 break;
2852                         }
2853                         if (calg != MT_COMP_ENABLE) {
2854                                 dcp->sel_comp_alg = calg;
2855                         } else if (dcp->sel_comp_alg == SA_COMP_NONE &&
2856                             softc->saved_comp_algorithm != 0) {
2857                                 dcp->sel_comp_alg = softc->saved_comp_algorithm;
2858                         }
2859                         break;
2860                 }
2861                 default:
2862                         /*
2863                          * The drive doesn't seem to support compression,
2864                          * so turn off the set compression bit.
2865                          */
2866                         params_to_set &= ~SA_PARAM_COMPRESSION;
2867                         xpt_print_path(periph->path);
2868                         printf("device does not seem to support compression\n");
2869
2870                         /*
2871                          * If that was the only thing the user wanted us to set,
2872                          * clean up allocated resources and return with
2873                          * 'operation not supported'.
2874                          */
2875                         if (params_to_set == SA_PARAM_NONE) {
2876                                 kfree(mode_buffer, M_TEMP);
2877                                 xpt_release_ccb(ccb);
2878                                 return (ENODEV);
2879                         }
2880                 
2881                         /*
2882                          * That wasn't the only thing the user wanted us to set.
2883                          * So, decrease the stated mode buffer length by the
2884                          * size of the compression mode page.
2885                          */
2886                         mode_buffer_len -= sizeof(sa_comp_t);
2887                 }
2888         }
2889
2890         /* It is safe to retry this operation */
2891         scsi_mode_select(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG,
2892             (params_to_set & SA_PARAM_COMPRESSION)? TRUE : FALSE,
2893             FALSE, mode_buffer, mode_buffer_len, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
2894
2895         error = cam_periph_runccb(ccb, saerror, 0,
2896             sense_flags, &softc->device_stats);
2897         QFRLS(ccb);
2898
2899         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
2900                 int idx;
2901                 char *xyz = mode_buffer;
2902                 xpt_print_path(periph->path);
2903                 printf("Err%d, Mode Select Data=", error);
2904                 for (idx = 0; idx < mode_buffer_len; idx++)
2905                         printf(" 0x%02x", xyz[idx] & 0xff);
2906                 printf("\n");
2907         }
2908
2909
2910         if (error) {
2911                 /*
2912                  * If we can, try without setting density/blocksize.
2913                  */
2914                 if (mode_blk) {
2915                         if ((params_to_set &
2916                             (SA_PARAM_DENSITY|SA_PARAM_BLOCKSIZE)) == 0) {
2917                                 mode_blk = NULL;
2918                                 goto retry;
2919                         }
2920                 } else {
2921                         mode_blk = (struct scsi_mode_blk_desc *)&mode_hdr[1];
2922                         cpage = (sa_comp_t *)&mode_blk[1];
2923                 }
2924
2925                 /*
2926                  * If we were setting the blocksize, and that failed, we
2927                  * want to set it to its original value.  If we weren't
2928                  * setting the blocksize, we don't want to change it.
2929                  */
2930                 scsi_ulto3b(current_blocksize, mode_blk->blklen);
2931
2932                 /*
2933                  * Set density if requested, else preserve old density.
2934                  * SCSI_SAME_DENSITY only applies to SCSI-2 or better
2935                  * devices, else density we've latched up in our softc.
2936                  */
2937                 if (params_to_set & SA_PARAM_DENSITY) {
2938                         mode_blk->density = current_density;
2939                 } else if (softc->scsi_rev > SCSI_REV_CCS) {
2940                         mode_blk->density = SCSI_SAME_DENSITY;
2941                 } else {
2942                         mode_blk->density = softc->media_density;
2943                 }
2944
2945                 if (params_to_set & SA_PARAM_COMPRESSION)
2946                         bcopy(ccomp, cpage, sizeof (sa_comp_t));
2947
2948                 /*
2949                  * The retry count is the only CCB field that might have been
2950                  * changed that we care about, so reset it back to 1.
2951                  */
2952                 ccb->ccb_h.retry_count = 1;
2953                 cam_periph_runccb(ccb, saerror, 0, sense_flags,
2954                     &softc->device_stats);
2955                 QFRLS(ccb);
2956         }
2957
2958         xpt_release_ccb(ccb);
2959
2960         if (ccomp != NULL)
2961                 kfree(ccomp, M_TEMP);
2962
2963         if (params_to_set & SA_PARAM_COMPRESSION) {
2964                 if (error) {
2965                         softc->flags &= ~SA_FLAG_COMP_ENABLED;
2966                         /*
2967                          * Even if we get an error setting compression,
2968                          * do not say that we don't support it. We could
2969                          * have been wrong, or it may be media specific.
2970                          *      softc->flags &= ~SA_FLAG_COMP_SUPP;
2971                          */
2972                         softc->saved_comp_algorithm = softc->comp_algorithm;
2973                         softc->comp_algorithm = 0;
2974                 } else {
2975                         softc->flags |= SA_FLAG_COMP_ENABLED;
2976                         softc->comp_algorithm = calg;
2977                 }
2978         }
2979
2980         kfree(mode_buffer, M_TEMP);
2981         return (error);
2982 }
2983
2984 static void
2985 saprevent(struct cam_periph *periph, int action)
2986 {
2987         struct  sa_softc *softc;
2988         union   ccb *ccb;               
2989         int     error, sf;
2990                 
2991         softc = (struct sa_softc *)periph->softc;
2992
2993         if ((action == PR_ALLOW) && (softc->flags & SA_FLAG_TAPE_LOCKED) == 0)
2994                 return;
2995         if ((action == PR_PREVENT) && (softc->flags & SA_FLAG_TAPE_LOCKED) != 0)
2996                 return;
2997
2998         /*
2999          * We can be quiet about illegal requests.
3000          */
3001         if (CAM_DEBUGGED(periph->path, CAM_DEBUG_INFO)) {
3002                 sf = 0;
3003         } else
3004                 sf = SF_QUIET_IR;
3005
3006         ccb = cam_periph_getccb(periph, 1);
3007
3008         /* It is safe to retry this operation */
3009         scsi_prevent(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, action,
3010             SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3011
3012         error = cam_periph_runccb(ccb, saerror, 0, sf, &softc->device_stats);
3013         QFRLS(ccb);
3014         if (error == 0) {
3015                 if (action == PR_ALLOW)
3016                         softc->flags &= ~SA_FLAG_TAPE_LOCKED;
3017                 else
3018                         softc->flags |= SA_FLAG_TAPE_LOCKED;
3019         }
3020
3021         xpt_release_ccb(ccb);
3022 }
3023
3024 static int
3025 sarewind(struct cam_periph *periph)
3026 {
3027         union   ccb *ccb;
3028         struct  sa_softc *softc;
3029         int     error;
3030                 
3031         softc = (struct sa_softc *)periph->softc;
3032
3033         ccb = cam_periph_getccb(periph, 1);
3034
3035         /* It is safe to retry this operation */
3036         scsi_rewind(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3037             SSD_FULL_SIZE, REWIND_TIMEOUT);
3038
3039         softc->dsreg = MTIO_DSREG_REW;
3040         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3041         softc->dsreg = MTIO_DSREG_REST;
3042
3043         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3044                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3045
3046         xpt_release_ccb(ccb);
3047         if (error == 0)
3048                 softc->fileno = softc->blkno = (daddr_t) 0;
3049         else
3050                 softc->fileno = softc->blkno = (daddr_t) -1;
3051         return (error);
3052 }
3053
3054 static int
3055 saspace(struct cam_periph *periph, int count, scsi_space_code code)
3056 {
3057         union   ccb *ccb;
3058         struct  sa_softc *softc;
3059         int     error;
3060                 
3061         softc = (struct sa_softc *)periph->softc;
3062
3063         ccb = cam_periph_getccb(periph, 1);
3064
3065         /* This cannot be retried */
3066
3067         scsi_space(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG, code, count,
3068             SSD_FULL_SIZE, SPACE_TIMEOUT);
3069
3070         /*
3071          * Clear residual because we will be using it.
3072          */
3073         softc->last_ctl_resid = 0;
3074
3075         softc->dsreg = (count < 0)? MTIO_DSREG_REV : MTIO_DSREG_FWD;
3076         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3077         softc->dsreg = MTIO_DSREG_REST;
3078
3079         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3080                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3081
3082         xpt_release_ccb(ccb);
3083
3084         /*
3085          * If a spacing operation has failed, we need to invalidate
3086          * this mount.
3087          *
3088          * If the spacing operation was setmarks or to end of recorded data,
3089          * we no longer know our relative position.
3090          *
3091          * If the spacing operations was spacing files in reverse, we
3092          * take account of the residual, but still check against less
3093          * than zero- if we've gone negative, we must have hit BOT.
3094          *
3095          * If the spacing operations was spacing records in reverse and
3096          * we have a residual, we've either hit BOT or hit a filemark.
3097          * In the former case, we know our new record number (0). In
3098          * the latter case, we have absolutely no idea what the real
3099          * record number is- we've stopped between the end of the last
3100          * record in the previous file and the filemark that stopped
3101          * our spacing backwards.
3102          */
3103         if (error) {
3104                 softc->fileno = softc->blkno = (daddr_t) -1;
3105         } else if (code == SS_SETMARKS || code == SS_EOD) {
3106                 softc->fileno = softc->blkno = (daddr_t) -1;
3107         } else if (code == SS_FILEMARKS && softc->fileno != (daddr_t) -1) {
3108                 softc->fileno += (count - softc->last_ctl_resid);
3109                 if (softc->fileno < 0)  /* we must of hit BOT */
3110                         softc->fileno = 0;
3111                 softc->blkno = 0;
3112         } else if (code == SS_BLOCKS && softc->blkno != (daddr_t) -1) {
3113                 softc->blkno += (count - softc->last_ctl_resid);
3114                 if (count < 0) {
3115                         if (softc->last_ctl_resid || softc->blkno < 0) {
3116                                 if (softc->fileno == 0) {
3117                                         softc->blkno = 0;
3118                                 } else {
3119                                         softc->blkno = (daddr_t) -1;
3120                                 }
3121                         }
3122                 }
3123         }
3124         return (error);
3125 }
3126
3127 static int
3128 sawritefilemarks(struct cam_periph *periph, int nmarks, int setmarks)
3129 {
3130         union   ccb *ccb;
3131         struct  sa_softc *softc;
3132         int     error, nwm = 0;
3133
3134         softc = (struct sa_softc *)periph->softc;
3135
3136         ccb = cam_periph_getccb(periph, 1);
3137         /*
3138          * Clear residual because we will be using it.
3139          */
3140         softc->last_ctl_resid = 0;
3141
3142         softc->dsreg = MTIO_DSREG_FMK;
3143         /* this *must* not be retried */
3144         scsi_write_filemarks(&ccb->csio, 0, sadone, MSG_SIMPLE_Q_TAG,
3145             FALSE, setmarks, nmarks, SSD_FULL_SIZE, IO_TIMEOUT);
3146         softc->dsreg = MTIO_DSREG_REST;
3147
3148
3149         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3150
3151         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3152                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3153
3154         if (error == 0 && nmarks) {
3155                 struct sa_softc *softc = (struct sa_softc *)periph->softc;
3156                 nwm = nmarks - softc->last_ctl_resid;
3157                 softc->filemarks += nwm;
3158         }
3159
3160         xpt_release_ccb(ccb);
3161
3162         /*
3163          * Update relative positions (if we're doing that).
3164          */
3165         if (error) {
3166                 softc->fileno = softc->blkno = (daddr_t) -1;
3167         } else if (softc->fileno != (daddr_t) -1) {
3168                 softc->fileno += nwm;
3169                 softc->blkno = 0;
3170         }
3171         return (error);
3172 }
3173
3174 static int
3175 sardpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3176 {
3177         struct scsi_tape_position_data loc;
3178         union ccb *ccb;
3179         struct sa_softc *softc = (struct sa_softc *)periph->softc;
3180         int error;
3181
3182         /*
3183          * We try and flush any buffered writes here if we were writing
3184          * and we're trying to get hardware block position. It eats
3185          * up performance substantially, but I'm wary of drive firmware.
3186          *
3187          * I think that *logical* block position is probably okay-
3188          * but hardware block position might have to wait for data
3189          * to hit media to be valid. Caveat Emptor.
3190          */
3191
3192         if (hard && (softc->flags & SA_FLAG_TAPE_WRITTEN)) {
3193                 error = sawritefilemarks(periph, 0, 0);
3194                 if (error && error != EACCES)
3195                         return (error);
3196         }
3197
3198         ccb = cam_periph_getccb(periph, 1);
3199         scsi_read_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3200             hard, &loc, SSD_FULL_SIZE, SCSIOP_TIMEOUT);
3201         softc->dsreg = MTIO_DSREG_RBSY;
3202         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3203         softc->dsreg = MTIO_DSREG_REST;
3204         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3205                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3206
3207         if (error == 0) {
3208                 if (loc.flags & SA_RPOS_UNCERTAIN) {
3209                         error = EINVAL;         /* nothing is certain */
3210                 } else {
3211                         *blkptr = scsi_4btoul(loc.firstblk);
3212                 }
3213         }
3214
3215         xpt_release_ccb(ccb);
3216         return (error);
3217 }
3218
3219 static int
3220 sasetpos(struct cam_periph *periph, int hard, u_int32_t *blkptr)
3221 {
3222         union ccb *ccb;
3223         struct sa_softc *softc;
3224         int error;
3225
3226         /*
3227          * We used to try and flush any buffered writes here.
3228          * Now we push this onto user applications to either
3229          * flush the pending writes themselves (via a zero count
3230          * WRITE FILEMARKS command) or they can trust their tape
3231          * drive to do this correctly for them.
3232          */
3233
3234         softc = (struct sa_softc *)periph->softc;
3235         ccb = cam_periph_getccb(periph, 1);
3236
3237         
3238         scsi_set_position(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG,
3239             hard, *blkptr, SSD_FULL_SIZE, SPACE_TIMEOUT);
3240
3241
3242         softc->dsreg = MTIO_DSREG_POS;
3243         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3244         softc->dsreg = MTIO_DSREG_REST;
3245         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3246                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, 0);
3247         xpt_release_ccb(ccb);
3248         /*
3249          * Note relative file && block number position as now unknown.
3250          */
3251         softc->fileno = softc->blkno = (daddr_t) -1;
3252         return (error);
3253 }
3254
3255 static int
3256 saretension(struct cam_periph *periph)
3257 {
3258         union ccb *ccb;
3259         struct sa_softc *softc;
3260         int error;
3261
3262         softc = (struct sa_softc *)periph->softc;
3263
3264         ccb = cam_periph_getccb(periph, 1);
3265
3266         /* It is safe to retry this operation */
3267         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3268             FALSE, TRUE,  TRUE, SSD_FULL_SIZE, ERASE_TIMEOUT);
3269
3270         softc->dsreg = MTIO_DSREG_TEN;
3271         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3272         softc->dsreg = MTIO_DSREG_REST;
3273
3274         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3275                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3276         xpt_release_ccb(ccb);
3277         if (error == 0)
3278                 softc->fileno = softc->blkno = (daddr_t) 0;
3279         else
3280                 softc->fileno = softc->blkno = (daddr_t) -1;
3281         return (error);
3282 }
3283
3284 static int
3285 sareservereleaseunit(struct cam_periph *periph, int reserve)
3286 {
3287         union ccb *ccb;
3288         struct sa_softc *softc;
3289         int error;
3290
3291         softc = (struct sa_softc *)periph->softc;
3292         ccb = cam_periph_getccb(periph,  1);
3293
3294         /* It is safe to retry this operation */
3295         scsi_reserve_release_unit(&ccb->csio, 2, sadone, MSG_SIMPLE_Q_TAG,
3296             FALSE,  0, SSD_FULL_SIZE,  SCSIOP_TIMEOUT, reserve);
3297         softc->dsreg = MTIO_DSREG_RBSY;
3298         error = cam_periph_runccb(ccb, saerror, 0,
3299             SF_RETRY_UA | SF_NO_PRINT, &softc->device_stats);
3300         softc->dsreg = MTIO_DSREG_REST;
3301         QFRLS(ccb);
3302         xpt_release_ccb(ccb);
3303
3304         /*
3305          * If the error was Illegal Request, then the device doesn't support
3306          * RESERVE/RELEASE. This is not an error.
3307          */
3308         if (error == EINVAL) {
3309                 error = 0;
3310         }
3311
3312         return (error);
3313 }
3314
3315 static int
3316 saloadunload(struct cam_periph *periph, int load)
3317 {
3318         union   ccb *ccb;
3319         struct  sa_softc *softc;
3320         int     error;
3321
3322         softc = (struct sa_softc *)periph->softc;
3323
3324         ccb = cam_periph_getccb(periph, 1);
3325
3326         /* It is safe to retry this operation */
3327         scsi_load_unload(&ccb->csio, 5, sadone, MSG_SIMPLE_Q_TAG, FALSE,
3328             FALSE, FALSE, load, SSD_FULL_SIZE, REWIND_TIMEOUT);
3329
3330         softc->dsreg = (load)? MTIO_DSREG_LD : MTIO_DSREG_UNL;
3331         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3332         softc->dsreg = MTIO_DSREG_REST;
3333         QFRLS(ccb);
3334         xpt_release_ccb(ccb);
3335
3336         if (error || load == 0)
3337                 softc->fileno = softc->blkno = (daddr_t) -1;
3338         else if (error == 0)
3339                 softc->fileno = softc->blkno = (daddr_t) 0;
3340         return (error);
3341 }
3342
3343 static int
3344 saerase(struct cam_periph *periph, int longerase)
3345 {
3346
3347         union   ccb *ccb;
3348         struct  sa_softc *softc;
3349         int error;
3350
3351         softc = (struct sa_softc *)periph->softc;
3352
3353         ccb = cam_periph_getccb(periph, 1);
3354
3355         scsi_erase(&ccb->csio, 1, sadone, MSG_SIMPLE_Q_TAG, FALSE, longerase,
3356             SSD_FULL_SIZE, ERASE_TIMEOUT);
3357
3358         softc->dsreg = MTIO_DSREG_ZER;
3359         error = cam_periph_runccb(ccb, saerror, 0, 0, &softc->device_stats);
3360         softc->dsreg = MTIO_DSREG_REST;
3361
3362         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
3363                 cam_release_devq(ccb->ccb_h.path, 0, 0, 0, FALSE);
3364         xpt_release_ccb(ccb);
3365         return (error);
3366 }
3367
3368 #endif /* _KERNEL */
3369
3370 /*
3371  * Read tape block limits command.
3372  */
3373 void
3374 scsi_read_block_limits(struct ccb_scsiio *csio, u_int32_t retries,
3375                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3376                    u_int8_t tag_action,
3377                    struct scsi_read_block_limits_data *rlimit_buf,
3378                    u_int8_t sense_len, u_int32_t timeout)
3379 {
3380         struct scsi_read_block_limits *scsi_cmd;
3381
3382         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3383              (u_int8_t *)rlimit_buf, sizeof(*rlimit_buf), sense_len,
3384              sizeof(*scsi_cmd), timeout);
3385
3386         scsi_cmd = (struct scsi_read_block_limits *)&csio->cdb_io.cdb_bytes;
3387         bzero(scsi_cmd, sizeof(*scsi_cmd));
3388         scsi_cmd->opcode = READ_BLOCK_LIMITS;
3389 }
3390
3391 void
3392 scsi_sa_read_write(struct ccb_scsiio *csio, u_int32_t retries,
3393                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3394                    u_int8_t tag_action, int readop, int sli,
3395                    int fixed, u_int32_t length, u_int8_t *data_ptr,
3396                    u_int32_t dxfer_len, u_int8_t sense_len, u_int32_t timeout)
3397 {
3398         struct scsi_sa_rw *scsi_cmd;
3399
3400         scsi_cmd = (struct scsi_sa_rw *)&csio->cdb_io.cdb_bytes;
3401         scsi_cmd->opcode = readop ? SA_READ : SA_WRITE;
3402         scsi_cmd->sli_fixed = 0;
3403         if (sli && readop)
3404                 scsi_cmd->sli_fixed |= SAR_SLI;
3405         if (fixed)
3406                 scsi_cmd->sli_fixed |= SARW_FIXED;
3407         scsi_ulto3b(length, scsi_cmd->length);
3408         scsi_cmd->control = 0;
3409
3410         cam_fill_csio(csio, retries, cbfcnp, readop ? CAM_DIR_IN : CAM_DIR_OUT,
3411             tag_action, data_ptr, dxfer_len, sense_len,
3412             sizeof(*scsi_cmd), timeout);
3413 }
3414
3415 void
3416 scsi_load_unload(struct ccb_scsiio *csio, u_int32_t retries,         
3417                  void (*cbfcnp)(struct cam_periph *, union ccb *),   
3418                  u_int8_t tag_action, int immediate, int eot,
3419                  int reten, int load, u_int8_t sense_len,
3420                  u_int32_t timeout)
3421 {
3422         struct scsi_load_unload *scsi_cmd;
3423
3424         scsi_cmd = (struct scsi_load_unload *)&csio->cdb_io.cdb_bytes;
3425         bzero(scsi_cmd, sizeof(*scsi_cmd));
3426         scsi_cmd->opcode = LOAD_UNLOAD;
3427         if (immediate)
3428                 scsi_cmd->immediate = SLU_IMMED;
3429         if (eot)
3430                 scsi_cmd->eot_reten_load |= SLU_EOT;
3431         if (reten)
3432                 scsi_cmd->eot_reten_load |= SLU_RETEN;
3433         if (load)
3434                 scsi_cmd->eot_reten_load |= SLU_LOAD;
3435
3436         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3437             NULL, 0, sense_len, sizeof(*scsi_cmd), timeout);    
3438 }
3439
3440 void
3441 scsi_rewind(struct ccb_scsiio *csio, u_int32_t retries,         
3442             void (*cbfcnp)(struct cam_periph *, union ccb *),   
3443             u_int8_t tag_action, int immediate, u_int8_t sense_len,     
3444             u_int32_t timeout)
3445 {
3446         struct scsi_rewind *scsi_cmd;
3447
3448         scsi_cmd = (struct scsi_rewind *)&csio->cdb_io.cdb_bytes;
3449         bzero(scsi_cmd, sizeof(*scsi_cmd));
3450         scsi_cmd->opcode = REWIND;
3451         if (immediate)
3452                 scsi_cmd->immediate = SREW_IMMED;
3453         
3454         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3455             0, sense_len, sizeof(*scsi_cmd), timeout);
3456 }
3457
3458 void
3459 scsi_space(struct ccb_scsiio *csio, u_int32_t retries,
3460            void (*cbfcnp)(struct cam_periph *, union ccb *),
3461            u_int8_t tag_action, scsi_space_code code,
3462            u_int32_t count, u_int8_t sense_len, u_int32_t timeout)
3463 {
3464         struct scsi_space *scsi_cmd;
3465
3466         scsi_cmd = (struct scsi_space *)&csio->cdb_io.cdb_bytes;
3467         scsi_cmd->opcode = SPACE;
3468         scsi_cmd->code = code;
3469         scsi_ulto3b(count, scsi_cmd->count);
3470         scsi_cmd->control = 0;
3471
3472         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3473             0, sense_len, sizeof(*scsi_cmd), timeout);
3474 }
3475
3476 void
3477 scsi_write_filemarks(struct ccb_scsiio *csio, u_int32_t retries,
3478                      void (*cbfcnp)(struct cam_periph *, union ccb *),
3479                      u_int8_t tag_action, int immediate, int setmark,
3480                      u_int32_t num_marks, u_int8_t sense_len,
3481                      u_int32_t timeout)
3482 {
3483         struct scsi_write_filemarks *scsi_cmd;
3484
3485         scsi_cmd = (struct scsi_write_filemarks *)&csio->cdb_io.cdb_bytes;
3486         bzero(scsi_cmd, sizeof(*scsi_cmd));
3487         scsi_cmd->opcode = WRITE_FILEMARKS;
3488         if (immediate)
3489                 scsi_cmd->byte2 |= SWFMRK_IMMED;
3490         if (setmark)
3491                 scsi_cmd->byte2 |= SWFMRK_WSMK;
3492         
3493         scsi_ulto3b(num_marks, scsi_cmd->num_marks);
3494
3495         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3496             0, sense_len, sizeof(*scsi_cmd), timeout);
3497 }
3498
3499 /*
3500  * The reserve and release unit commands differ only by their opcodes.
3501  */
3502 void
3503 scsi_reserve_release_unit(struct ccb_scsiio *csio, u_int32_t retries,
3504                           void (*cbfcnp)(struct cam_periph *, union ccb *),
3505                           u_int8_t tag_action, int third_party,
3506                           int third_party_id, u_int8_t sense_len,
3507                           u_int32_t timeout, int reserve)
3508 {
3509         struct scsi_reserve_release_unit *scsi_cmd;
3510
3511         scsi_cmd = (struct scsi_reserve_release_unit *)&csio->cdb_io.cdb_bytes;
3512         bzero(scsi_cmd, sizeof(*scsi_cmd));
3513
3514         if (reserve)
3515                 scsi_cmd->opcode = RESERVE_UNIT;
3516         else
3517                 scsi_cmd->opcode = RELEASE_UNIT;
3518
3519         if (third_party) {
3520                 scsi_cmd->lun_thirdparty |= SRRU_3RD_PARTY;
3521                 scsi_cmd->lun_thirdparty |=
3522                         ((third_party_id << SRRU_3RD_SHAMT) & SRRU_3RD_MASK);
3523         }
3524
3525         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3526             0, sense_len, sizeof(*scsi_cmd), timeout);
3527 }
3528
3529 void
3530 scsi_erase(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 long_erase,
3533            u_int8_t sense_len, u_int32_t timeout)
3534 {
3535         struct scsi_erase *scsi_cmd;
3536
3537         scsi_cmd = (struct scsi_erase *)&csio->cdb_io.cdb_bytes;
3538         bzero(scsi_cmd, sizeof(*scsi_cmd));
3539
3540         scsi_cmd->opcode = ERASE;
3541
3542         if (immediate)
3543                 scsi_cmd->lun_imm_long |= SE_IMMED;
3544
3545         if (long_erase)
3546                 scsi_cmd->lun_imm_long |= SE_LONG;
3547
3548         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action, NULL,
3549             0, sense_len, sizeof(*scsi_cmd), timeout);
3550 }
3551
3552 /*
3553  * Read Tape Position command.
3554  */
3555 void
3556 scsi_read_position(struct ccb_scsiio *csio, u_int32_t retries,
3557                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3558                    u_int8_t tag_action, int hardsoft,
3559                    struct scsi_tape_position_data *sbp,
3560                    u_int8_t sense_len, u_int32_t timeout)
3561 {
3562         struct scsi_tape_read_position *scmd;
3563
3564         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_IN, tag_action,
3565             (u_int8_t *)sbp, sizeof (*sbp), sense_len, sizeof(*scmd), timeout);
3566         scmd = (struct scsi_tape_read_position *)&csio->cdb_io.cdb_bytes;
3567         bzero(scmd, sizeof(*scmd));
3568         scmd->opcode = READ_POSITION;
3569         scmd->byte1 = hardsoft;
3570 }
3571
3572 /*
3573  * Set Tape Position command.
3574  */
3575 void
3576 scsi_set_position(struct ccb_scsiio *csio, u_int32_t retries,
3577                    void (*cbfcnp)(struct cam_periph *, union ccb *),
3578                    u_int8_t tag_action, int hardsoft, u_int32_t blkno,
3579                    u_int8_t sense_len, u_int32_t timeout)
3580 {
3581         struct scsi_tape_locate *scmd;
3582
3583         cam_fill_csio(csio, retries, cbfcnp, CAM_DIR_NONE, tag_action,
3584             (u_int8_t *)NULL, 0, sense_len, sizeof(*scmd), timeout);
3585         scmd = (struct scsi_tape_locate *)&csio->cdb_io.cdb_bytes;
3586         bzero(scmd, sizeof(*scmd));
3587         scmd->opcode = LOCATE;
3588         if (hardsoft)
3589                 scmd->byte1 |= SA_SPOS_BT;
3590         scsi_ulto4b(blkno, scmd->blkaddr);
3591 }