drivers/scsi/osst.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *      $Header: /cvsroot/osst/Driver/osst.h,v 1.16 2005/01/01 21:13:35 wriede Exp $
   4  */
   5
   6 #include <asm/byteorder.h>
   7 #include <linux/completion.h>
   8 #include <linux/mutex.h>
   9
  10 /*      FIXME - rename and use the following two types or delete them!
  11  *              and the types really should go to st.h anyway...
  12  *      INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
  13  */
  14 typedef struct {
  15         unsigned        device_type     :5;     /* Peripheral Device Type */
  16         unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
  17         unsigned        reserved1_6t0   :7;     /* Reserved */
  18         unsigned        rmb             :1;     /* Removable Medium Bit */
  19         unsigned        ansi_version    :3;     /* ANSI Version */
  20         unsigned        ecma_version    :3;     /* ECMA Version */
  21         unsigned        iso_version     :2;     /* ISO Version */
  22         unsigned        response_format :4;     /* Response Data Format */
  23         unsigned        reserved3_45    :2;     /* Reserved */
  24         unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
  25         unsigned        reserved3_7     :1;     /* AENC - Reserved */
  26         u8              additional_length;      /* Additional Length (total_length-4) */
  27         u8              rsv5, rsv6, rsv7;       /* Reserved */
  28         u8              vendor_id[8];           /* Vendor Identification */
  29         u8              product_id[16];         /* Product Identification */
  30         u8              revision_level[4];      /* Revision Level */
  31         u8              vendor_specific[20];    /* Vendor Specific - Optional */
  32         u8              reserved56t95[40];      /* Reserved - Optional */
  33                                                 /* Additional information may be returned */
  34 } idetape_inquiry_result_t;
  35
  36 /*
  37  *      READ POSITION packet command - Data Format (From Table 6-57)
  38  */
  39 typedef struct {
  40         unsigned        reserved0_10    :2;     /* Reserved */
  41         unsigned        bpu             :1;     /* Block Position Unknown */
  42         unsigned        reserved0_543   :3;     /* Reserved */
  43         unsigned        eop             :1;     /* End Of Partition */
  44         unsigned        bop             :1;     /* Beginning Of Partition */
  45         u8              partition;              /* Partition Number */
  46         u8              reserved2, reserved3;   /* Reserved */
  47         u32             first_block;            /* First Block Location */
  48         u32             last_block;             /* Last Block Location (Optional) */
  49         u8              reserved12;             /* Reserved */
  50         u8              blocks_in_buffer[3];    /* Blocks In Buffer - (Optional) */
  51         u32             bytes_in_buffer;        /* Bytes In Buffer (Optional) */
  52 } idetape_read_position_result_t;
  53
  54 /*
  55  *      Follows structures which are related to the SELECT SENSE / MODE SENSE
  56  *      packet commands.
  57  */
  58 #define COMPRESSION_PAGE           0x0f
  59 #define COMPRESSION_PAGE_LENGTH    16
  60
  61 #define CAPABILITIES_PAGE          0x2a
  62 #define CAPABILITIES_PAGE_LENGTH   20
  63
  64 #define TAPE_PARAMTR_PAGE          0x2b
  65 #define TAPE_PARAMTR_PAGE_LENGTH   16
  66
  67 #define NUMBER_RETRIES_PAGE        0x2f
  68 #define NUMBER_RETRIES_PAGE_LENGTH 4
  69
  70 #define BLOCK_SIZE_PAGE            0x30
  71 #define BLOCK_SIZE_PAGE_LENGTH     4
  72
  73 #define BUFFER_FILLING_PAGE        0x33
  74 #define BUFFER_FILLING_PAGE_LENGTH 4
  75
  76 #define VENDOR_IDENT_PAGE          0x36
  77 #define VENDOR_IDENT_PAGE_LENGTH   8
  78
  79 #define LOCATE_STATUS_PAGE         0x37
  80 #define LOCATE_STATUS_PAGE_LENGTH  0
  81
  82 #define MODE_HEADER_LENGTH         4
  83
  84
  85 /*
  86  *      REQUEST SENSE packet command result - Data Format.
  87  */
  88 typedef struct {
  89         unsigned        error_code      :7;     /* Current of deferred errors */
  90         unsigned        valid           :1;     /* The information field conforms to QIC-157C */
  91         u8              reserved1       :8;     /* Segment Number - Reserved */
  92         unsigned        sense_key       :4;     /* Sense Key */
  93         unsigned        reserved2_4     :1;     /* Reserved */
  94         unsigned        ili             :1;     /* Incorrect Length Indicator */
  95         unsigned        eom             :1;     /* End Of Medium */
  96         unsigned        filemark        :1;     /* Filemark */
  97         u32             information __attribute__ ((packed));
  98         u8              asl;                    /* Additional sense length (n-7) */
  99         u32             command_specific;       /* Additional command specific information */
 100         u8              asc;                    /* Additional Sense Code */
 101         u8              ascq;                   /* Additional Sense Code Qualifier */
 102         u8              replaceable_unit_code;  /* Field Replaceable Unit Code */
 103         unsigned        sk_specific1    :7;     /* Sense Key Specific */
 104         unsigned        sksv            :1;     /* Sense Key Specific information is valid */
 105         u8              sk_specific2;           /* Sense Key Specific */
 106         u8              sk_specific3;           /* Sense Key Specific */
 107         u8              pad[2];                 /* Padding to 20 bytes */
 108 } idetape_request_sense_result_t;
 109
 110 /*
 111  *      Mode Parameter Header for the MODE SENSE packet command
 112  */
 113 typedef struct {
 114         u8              mode_data_length;       /* Length of the following data transfer */
 115         u8              medium_type;            /* Medium Type */
 116         u8              dsp;                    /* Device Specific Parameter */
 117         u8              bdl;                    /* Block Descriptor Length */
 118 } osst_mode_parameter_header_t;
 119
 120 /*
 121  *      Mode Parameter Block Descriptor the MODE SENSE packet command
 122  *
 123  *      Support for block descriptors is optional.
 124  */
 125 typedef struct {
 126         u8              density_code;           /* Medium density code */
 127         u8              blocks[3];              /* Number of blocks */
 128         u8              reserved4;              /* Reserved */
 129         u8              length[3];              /* Block Length */
 130 } osst_parameter_block_descriptor_t;
 131
 132 /*
 133  *      The Data Compression Page, as returned by the MODE SENSE packet command.
 134  */
 135 typedef struct {
 136 #if   defined(__BIG_ENDIAN_BITFIELD)
 137         unsigned        ps              :1;
 138         unsigned        reserved0       :1;     /* Reserved */
 139         unsigned        page_code       :6;     /* Page Code - Should be 0xf */
 140 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 141         unsigned        page_code       :6;     /* Page Code - Should be 0xf */
 142         unsigned        reserved0       :1;     /* Reserved */
 143         unsigned        ps              :1;
 144 #else
 145 #error "Please fix <asm/byteorder.h>"
 146 #endif
 147         u8              page_length;            /* Page Length - Should be 14 */
 148 #if   defined(__BIG_ENDIAN_BITFIELD)
 149         unsigned        dce             :1;     /* Data Compression Enable */
 150         unsigned        dcc             :1;     /* Data Compression Capable */
 151         unsigned        reserved2       :6;     /* Reserved */
 152 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 153         unsigned        reserved2       :6;     /* Reserved */
 154         unsigned        dcc             :1;     /* Data Compression Capable */
 155         unsigned        dce             :1;     /* Data Compression Enable */
 156 #else
 157 #error "Please fix <asm/byteorder.h>"
 158 #endif
 159 #if   defined(__BIG_ENDIAN_BITFIELD)
 160         unsigned        dde             :1;     /* Data Decompression Enable */
 161         unsigned        red             :2;     /* Report Exception on Decompression */
 162         unsigned        reserved3       :5;     /* Reserved */
 163 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 164         unsigned        reserved3       :5;     /* Reserved */
 165         unsigned        red             :2;     /* Report Exception on Decompression */
 166         unsigned        dde             :1;     /* Data Decompression Enable */
 167 #else
 168 #error "Please fix <asm/byteorder.h>"
 169 #endif
 170         u32             ca;                     /* Compression Algorithm */
 171         u32             da;                     /* Decompression Algorithm */
 172         u8              reserved[4];            /* Reserved */
 173 } osst_data_compression_page_t;
 174
 175 /*
 176  *      The Medium Partition Page, as returned by the MODE SENSE packet command.
 177  */
 178 typedef struct {
 179 #if   defined(__BIG_ENDIAN_BITFIELD)
 180         unsigned        ps              :1;
 181         unsigned        reserved1_6     :1;     /* Reserved */
 182         unsigned        page_code       :6;     /* Page Code - Should be 0x11 */
 183 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 184         unsigned        page_code       :6;     /* Page Code - Should be 0x11 */
 185         unsigned        reserved1_6     :1;     /* Reserved */
 186         unsigned        ps              :1;
 187 #else
 188 #error "Please fix <asm/byteorder.h>"
 189 #endif
 190         u8              page_length;            /* Page Length - Should be 6 */
 191         u8              map;                    /* Maximum Additional Partitions - Should be 0 */
 192         u8              apd;                    /* Additional Partitions Defined - Should be 0 */
 193 #if   defined(__BIG_ENDIAN_BITFIELD)
 194         unsigned        fdp             :1;     /* Fixed Data Partitions */
 195         unsigned        sdp             :1;     /* Should be 0 */
 196         unsigned        idp             :1;     /* Should be 0 */
 197         unsigned        psum            :2;     /* Should be 0 */
 198         unsigned        reserved4_012   :3;     /* Reserved */
 199 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 200         unsigned        reserved4_012   :3;     /* Reserved */
 201         unsigned        psum            :2;     /* Should be 0 */
 202         unsigned        idp             :1;     /* Should be 0 */
 203         unsigned        sdp             :1;     /* Should be 0 */
 204         unsigned        fdp             :1;     /* Fixed Data Partitions */
 205 #else
 206 #error "Please fix <asm/byteorder.h>"
 207 #endif
 208         u8              mfr;                    /* Medium Format Recognition */
 209         u8              reserved[2];            /* Reserved */
 210 } osst_medium_partition_page_t;
 211
 212 /*
 213  *      Capabilities and Mechanical Status Page
 214  */
 215 typedef struct {
 216 #if   defined(__BIG_ENDIAN_BITFIELD)
 217         unsigned        reserved1_67    :2;
 218         unsigned        page_code       :6;     /* Page code - Should be 0x2a */
 219 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 220         unsigned        page_code       :6;     /* Page code - Should be 0x2a */
 221         unsigned        reserved1_67    :2;
 222 #else
 223 #error "Please fix <asm/byteorder.h>"
 224 #endif
 225         u8              page_length;            /* Page Length - Should be 0x12 */
 226         u8              reserved2, reserved3;
 227 #if   defined(__BIG_ENDIAN_BITFIELD)
 228         unsigned        reserved4_67    :2;
 229         unsigned        sprev           :1;     /* Supports SPACE in the reverse direction */
 230         unsigned        reserved4_1234  :4;
 231         unsigned        ro              :1;     /* Read Only Mode */
 232 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 233         unsigned        ro              :1;     /* Read Only Mode */
 234         unsigned        reserved4_1234  :4;
 235         unsigned        sprev           :1;     /* Supports SPACE in the reverse direction */
 236         unsigned        reserved4_67    :2;
 237 #else
 238 #error "Please fix <asm/byteorder.h>"
 239 #endif
 240 #if   defined(__BIG_ENDIAN_BITFIELD)
 241         unsigned        reserved5_67    :2;
 242         unsigned        qfa             :1;     /* Supports the QFA two partition formats */
 243         unsigned        reserved5_4     :1;
 244         unsigned        efmt            :1;     /* Supports ERASE command initiated formatting */
 245         unsigned        reserved5_012   :3;
 246 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 247         unsigned        reserved5_012   :3;
 248         unsigned        efmt            :1;     /* Supports ERASE command initiated formatting */
 249         unsigned        reserved5_4     :1;
 250         unsigned        qfa             :1;     /* Supports the QFA two partition formats */
 251         unsigned        reserved5_67    :2;
 252 #else
 253 #error "Please fix <asm/byteorder.h>"
 254 #endif
 255 #if   defined(__BIG_ENDIAN_BITFIELD)
 256         unsigned        cmprs           :1;     /* Supports data compression */
 257         unsigned        ecc             :1;     /* Supports error correction */
 258         unsigned        reserved6_45    :2;     /* Reserved */
 259         unsigned        eject           :1;     /* The device can eject the volume */
 260         unsigned        prevent         :1;     /* The device defaults in the prevent state after power up */
 261         unsigned        locked          :1;     /* The volume is locked */
 262         unsigned        lock            :1;     /* Supports locking the volume */
 263 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 264         unsigned        lock            :1;     /* Supports locking the volume */
 265         unsigned        locked          :1;     /* The volume is locked */
 266         unsigned        prevent         :1;     /* The device defaults in the prevent state after power up */
 267         unsigned        eject           :1;     /* The device can eject the volume */
 268         unsigned        reserved6_45    :2;     /* Reserved */
 269         unsigned        ecc             :1;     /* Supports error correction */
 270         unsigned        cmprs           :1;     /* Supports data compression */
 271 #else
 272 #error "Please fix <asm/byteorder.h>"
 273 #endif
 274 #if   defined(__BIG_ENDIAN_BITFIELD)
 275         unsigned        blk32768        :1;     /* slowb - the device restricts the byte count for PIO */
 276                                                 /* transfers for slow buffer memory ??? */
 277                                                 /* Also 32768 block size in some cases */
 278         unsigned        reserved7_3_6   :4;
 279         unsigned        blk1024         :1;     /* Supports 1024 bytes block size */
 280         unsigned        blk512          :1;     /* Supports 512 bytes block size */
 281         unsigned        reserved7_0     :1;
 282 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 283         unsigned        reserved7_0     :1;
 284         unsigned        blk512          :1;     /* Supports 512 bytes block size */
 285         unsigned        blk1024         :1;     /* Supports 1024 bytes block size */
 286         unsigned        reserved7_3_6   :4;
 287         unsigned        blk32768        :1;     /* slowb - the device restricts the byte count for PIO */
 288                                                 /* transfers for slow buffer memory ??? */
 289                                                 /* Also 32768 block size in some cases */
 290 #else
 291 #error "Please fix <asm/byteorder.h>"
 292 #endif
 293         __be16          max_speed;              /* Maximum speed supported in KBps */
 294         u8              reserved10, reserved11;
 295         __be16          ctl;                    /* Continuous Transfer Limit in blocks */
 296         __be16          speed;                  /* Current Speed, in KBps */
 297         __be16          buffer_size;            /* Buffer Size, in 512 bytes */
 298         u8              reserved18, reserved19;
 299 } osst_capabilities_page_t;
 300
 301 /*
 302  *      Block Size Page
 303  */
 304 typedef struct {
 305 #if   defined(__BIG_ENDIAN_BITFIELD)
 306         unsigned        ps              :1;
 307         unsigned        reserved1_6     :1;
 308         unsigned        page_code       :6;     /* Page code - Should be 0x30 */
 309 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 310         unsigned        page_code       :6;     /* Page code - Should be 0x30 */
 311         unsigned        reserved1_6     :1;
 312         unsigned        ps              :1;
 313 #else
 314 #error "Please fix <asm/byteorder.h>"
 315 #endif
 316         u8              page_length;            /* Page Length - Should be 2 */
 317         u8              reserved2;
 318 #if   defined(__BIG_ENDIAN_BITFIELD)
 319         unsigned        one             :1;
 320         unsigned        reserved2_6     :1;
 321         unsigned        record32_5      :1;
 322         unsigned        record32        :1;
 323         unsigned        reserved2_23    :2;
 324         unsigned        play32_5        :1;
 325         unsigned        play32          :1;
 326 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 327         unsigned        play32          :1;
 328         unsigned        play32_5        :1;
 329         unsigned        reserved2_23    :2;
 330         unsigned        record32        :1;
 331         unsigned        record32_5      :1;
 332         unsigned        reserved2_6     :1;
 333         unsigned        one             :1;
 334 #else
 335 #error "Please fix <asm/byteorder.h>"
 336 #endif
 337 } osst_block_size_page_t;
 338
 339 /*
 340  *      Tape Parameters Page
 341  */
 342 typedef struct {
 343 #if   defined(__BIG_ENDIAN_BITFIELD)
 344         unsigned        ps              :1;
 345         unsigned        reserved1_6     :1;
 346         unsigned        page_code       :6;     /* Page code - Should be 0x2b */
 347 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 348         unsigned        page_code       :6;     /* Page code - Should be 0x2b */
 349         unsigned        reserved1_6     :1;
 350         unsigned        ps              :1;
 351 #else
 352 #error "Please fix <asm/byteorder.h>"
 353 #endif
 354         u8              reserved2;
 355         u8              density;
 356         u8              reserved3,reserved4;
 357         __be16          segtrk;
 358         __be16          trks;
 359         u8              reserved5,reserved6,reserved7,reserved8,reserved9,reserved10;
 360 } osst_tape_paramtr_page_t;
 361
 362 /* OnStream definitions */
 363
 364 #define OS_CONFIG_PARTITION     (0xff)
 365 #define OS_DATA_PARTITION       (0)
 366 #define OS_PARTITION_VERSION    (1)
 367
 368 /*
 369  * partition
 370  */
 371 typedef struct os_partition_s {
 372         __u8    partition_num;
 373         __u8    par_desc_ver;
 374         __be16  wrt_pass_cntr;
 375         __be32  first_frame_ppos;
 376         __be32  last_frame_ppos;
 377         __be32  eod_frame_ppos;
 378 } os_partition_t;
 379
 380 /*
 381  * DAT entry
 382  */
 383 typedef struct os_dat_entry_s {
 384         __be32  blk_sz;
 385         __be16  blk_cnt;
 386         __u8    flags;
 387         __u8    reserved;
 388 } os_dat_entry_t;
 389
 390 /*
 391  * DAT
 392  */
 393 #define OS_DAT_FLAGS_DATA       (0xc)
 394 #define OS_DAT_FLAGS_MARK       (0x1)
 395
 396 typedef struct os_dat_s {
 397         __u8            dat_sz;
 398         __u8            reserved1;
 399         __u8            entry_cnt;
 400         __u8            reserved3;
 401         os_dat_entry_t  dat_list[16];
 402 } os_dat_t;
 403
 404 /*
 405  * Frame types
 406  */
 407 #define OS_FRAME_TYPE_FILL      (0)
 408 #define OS_FRAME_TYPE_EOD       (1 << 0)
 409 #define OS_FRAME_TYPE_MARKER    (1 << 1)
 410 #define OS_FRAME_TYPE_HEADER    (1 << 3)
 411 #define OS_FRAME_TYPE_DATA      (1 << 7)
 412
 413 /*
 414  * AUX
 415  */
 416 typedef struct os_aux_s {
 417         __be32          format_id;              /* hardware compatibility AUX is based on */
 418         char            application_sig[4];     /* driver used to write this media */
 419         __be32          hdwr;                   /* reserved */
 420         __be32          update_frame_cntr;      /* for configuration frame */
 421         __u8            frame_type;
 422         __u8            frame_type_reserved;
 423         __u8            reserved_18_19[2];
 424         os_partition_t  partition;
 425         __u8            reserved_36_43[8];
 426         __be32          frame_seq_num;
 427         __be32          logical_blk_num_high;
 428         __be32          logical_blk_num;
 429         os_dat_t        dat;
 430         __u8            reserved188_191[4];
 431         __be32          filemark_cnt;
 432         __be32          phys_fm;
 433         __be32          last_mark_ppos;
 434         __u8            reserved204_223[20];
 435
 436         /*
 437          * __u8         app_specific[32];
 438          *
 439          * Linux specific fields:
 440          */
 441          __be32         next_mark_ppos;         /* when known, points to next marker */
 442          __be32         last_mark_lbn;          /* storing log_blk_num of last mark is extends ADR spec */
 443          __u8           linux_specific[24];
 444
 445         __u8            reserved_256_511[256];
 446 } os_aux_t;
 447
 448 #define OS_FM_TAB_MAX 1024
 449
 450 typedef struct os_fm_tab_s {
 451         __u8            fm_part_num;
 452         __u8            reserved_1;
 453         __u8            fm_tab_ent_sz;
 454         __u8            reserved_3;
 455         __be16          fm_tab_ent_cnt;
 456         __u8            reserved6_15[10];
 457         __be32          fm_tab_ent[OS_FM_TAB_MAX];
 458 } os_fm_tab_t;
 459
 460 typedef struct os_ext_trk_ey_s {
 461         __u8            et_part_num;
 462         __u8            fmt;
 463         __be16          fm_tab_off;
 464         __u8            reserved4_7[4];
 465         __be32          last_hlb_hi;
 466         __be32          last_hlb;
 467         __be32          last_pp;
 468         __u8            reserved20_31[12];
 469 } os_ext_trk_ey_t;
 470
 471 typedef struct os_ext_trk_tb_s {
 472         __u8            nr_stream_part;
 473         __u8            reserved_1;
 474         __u8            et_ent_sz;
 475         __u8            reserved3_15[13];
 476         os_ext_trk_ey_t dat_ext_trk_ey;
 477         os_ext_trk_ey_t qfa_ext_trk_ey;
 478 } os_ext_trk_tb_t;
 479
 480 typedef struct os_header_s {
 481         char            ident_str[8];
 482         __u8            major_rev;
 483         __u8            minor_rev;
 484         __be16          ext_trk_tb_off;
 485         __u8            reserved12_15[4];
 486         __u8            pt_par_num;
 487         __u8            pt_reserved1_3[3];
 488         os_partition_t  partition[16];
 489         __be32          cfg_col_width;
 490         __be32          dat_col_width;
 491         __be32          qfa_col_width;
 492         __u8            cartridge[16];
 493         __u8            reserved304_511[208];
 494         __be32          old_filemark_list[16680/4];             /* in ADR 1.4 __u8 track_table[16680] */
 495         os_ext_trk_tb_t ext_track_tb;
 496         __u8            reserved17272_17735[464];
 497         os_fm_tab_t     dat_fm_tab;
 498         os_fm_tab_t     qfa_fm_tab;
 499         __u8            reserved25960_32767[6808];
 500 } os_header_t;
 501
 502
 503 /*
 504  * OnStream ADRL frame
 505  */
 506 #define OS_FRAME_SIZE   (32 * 1024 + 512)
 507 #define OS_DATA_SIZE    (32 * 1024)
 508 #define OS_AUX_SIZE     (512)
 509 //#define OSST_MAX_SG      2
 510
 511 /* The OnStream tape buffer descriptor. */
 512 struct osst_buffer {
 513   unsigned char in_use;
 514   unsigned char dma;    /* DMA-able buffer */
 515   int buffer_size;
 516   int buffer_blocks;
 517   int buffer_bytes;
 518   int read_pointer;
 519   int writing;
 520   int midlevel_result;
 521   int syscall_result;
 522   struct osst_request *last_SRpnt;
 523   struct st_cmdstatus cmdstat;
 524   struct rq_map_data map_data;
 525   unsigned char *b_data;
 526   os_aux_t *aux;               /* onstream AUX structure at end of each block     */
 527   unsigned short use_sg;       /* zero or number of s/g segments for this adapter */
 528   unsigned short sg_segs;      /* number of segments in s/g list                  */
 529   unsigned short orig_sg_segs; /* number of segments allocated at first try       */
 530   struct scatterlist sg[1];    /* MUST BE last item                               */
 531 } ;
 532
 533 /* The OnStream tape drive descriptor */
 534 struct osst_tape {
 535   struct scsi_driver *driver;
 536   unsigned capacity;
 537   struct scsi_device *device;
 538   struct mutex lock;           /* for serialization */
 539   struct completion wait;      /* for SCSI commands */
 540   struct osst_buffer * buffer;
 541
 542   /* Drive characteristics */
 543   unsigned char omit_blklims;
 544   unsigned char do_auto_lock;
 545   unsigned char can_bsr;
 546   unsigned char can_partitions;
 547   unsigned char two_fm;
 548   unsigned char fast_mteom;
 549   unsigned char restr_dma;
 550   unsigned char scsi2_logical;
 551   unsigned char default_drvbuffer;  /* 0xff = don't touch, value 3 bits */
 552   unsigned char pos_unknown;        /* after reset position unknown */
 553   int write_threshold;
 554   int timeout;                  /* timeout for normal commands */
 555   int long_timeout;             /* timeout for commands known to take long time*/
 556
 557   /* Mode characteristics */
 558   struct st_modedef modes[ST_NBR_MODES];
 559   int current_mode;
 560
 561   /* Status variables */
 562   int partition;
 563   int new_partition;
 564   int nbr_partitions;    /* zero until partition support enabled */
 565   struct st_partstat ps[ST_NBR_PARTITIONS];
 566   unsigned char dirty;
 567   unsigned char ready;
 568   unsigned char write_prot;
 569   unsigned char drv_write_prot;
 570   unsigned char in_use;
 571   unsigned char blksize_changed;
 572   unsigned char density_changed;
 573   unsigned char compression_changed;
 574   unsigned char drv_buffer;
 575   unsigned char density;
 576   unsigned char door_locked;
 577   unsigned char rew_at_close;
 578   unsigned char inited;
 579   int block_size;
 580   int min_block;
 581   int max_block;
 582   int recover_count;            /* from tape opening */
 583   int abort_count;
 584   int write_count;
 585   int read_count;
 586   int recover_erreg;            /* from last status call */
 587   /*
 588    * OnStream specific data
 589    */
 590   int      os_fw_rev;                          /* the firmware revision * 10000 */
 591   unsigned char  raw;                          /* flag OnStream raw access (32.5KB block size) */
 592   unsigned char  poll;                         /* flag that this drive needs polling (IDE|firmware) */
 593   unsigned char  frame_in_buffer;              /* flag that the frame as per frame_seq_number
 594                                                 * has been read into STp->buffer and is valid */
 595   int      frame_seq_number;                   /* logical frame number */
 596   int      logical_blk_num;                    /* logical block number */
 597   unsigned first_frame_position;               /* physical frame to be transferred to/from host */
 598   unsigned last_frame_position;                /* physical frame to be transferd to/from tape */
 599   int      cur_frames;                         /* current number of frames in internal buffer */
 600   int      max_frames;                         /* max number of frames in internal buffer */
 601   char     application_sig[5];                 /* application signature */
 602   unsigned char  fast_open;                    /* flag that reminds us we didn't check headers at open */
 603   unsigned short wrt_pass_cntr;                /* write pass counter */
 604   int      update_frame_cntr;                  /* update frame counter */
 605   int      onstream_write_error;               /* write error recovery active */
 606   int      header_ok;                          /* header frame verified ok */
 607   int      linux_media;                        /* reading linux-specifc media */
 608   int      linux_media_version;
 609   os_header_t * header_cache;                  /* cache is kept for filemark positions */
 610   int      filemark_cnt;
 611   int      first_mark_ppos;
 612   int      last_mark_ppos;
 613   int      last_mark_lbn;                       /* storing log_blk_num of last mark is extends ADR spec */
 614   int      first_data_ppos;
 615   int      eod_frame_ppos;
 616   int      eod_frame_lfa;
 617   int      write_type;                          /* used in write error recovery */
 618   int      read_error_frame;                    /* used in read error recovery */
 619   unsigned long cmd_start_time;
 620   unsigned long max_cmd_time;
 621
 622 #if DEBUG
 623   unsigned char write_pending;
 624   int nbr_finished;
 625   int nbr_waits;
 626   unsigned char last_cmnd[6];
 627   unsigned char last_sense[16];
 628 #endif
 629   struct gendisk *drive;
 630 } ;
 631
 632 /* scsi tape command */
 633 struct osst_request {
 634         unsigned char cmd[MAX_COMMAND_SIZE];
 635         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 636         int result;
 637         struct osst_tape *stp;
 638         struct completion *waiting;
 639         struct bio *bio;
 640 };
 641
 642 /* Values of write_type */
 643 #define OS_WRITE_DATA      0
 644 #define OS_WRITE_EOD       1
 645 #define OS_WRITE_NEW_MARK  2
 646 #define OS_WRITE_LAST_MARK 3
 647 #define OS_WRITE_HEADER    4
 648 #define OS_WRITE_FILLER    5
 649
 650 /* Additional rw state */
 651 #define OS_WRITING_COMPLETE 3