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