drivers/scsi/osst.h

   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
   8 /*      FIXME - rename and use the following two types or delete them!
   9  *              and the types really should go to st.h anyway...
  10  *      INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
  11  */
  12 typedef struct {
  13         unsigned        device_type     :5;     /* Peripheral Device Type */
  14         unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
  15         unsigned        reserved1_6t0   :7;     /* Reserved */
  16         unsigned        rmb             :1;     /* Removable Medium Bit */
  17         unsigned        ansi_version    :3;     /* ANSI Version */
  18         unsigned        ecma_version    :3;     /* ECMA Version */
  19         unsigned        iso_version     :2;     /* ISO Version */
  20         unsigned        response_format :4;     /* Response Data Format */
  21         unsigned        reserved3_45    :2;     /* Reserved */
  22         unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
  23         unsigned        reserved3_7     :1;     /* AENC - Reserved */
  24         u8              additional_length;      /* Additional Length (total_length-4) */
  25         u8              rsv5, rsv6, rsv7;       /* Reserved */
  26         u8              vendor_id[8];           /* Vendor Identification */
  27         u8              product_id[16];         /* Product Identification */
  28         u8              revision_level[4];      /* Revision Level */
  29         u8              vendor_specific[20];    /* Vendor Specific - Optional */
  30         u8              reserved56t95[40];      /* Reserved - Optional */
  31                                                 /* Additional information may be returned */
  32 } idetape_inquiry_result_t;
  33
  34 /*
  35  *      READ POSITION packet command - Data Format (From Table 6-57)
  36  */
  37 typedef struct {
  38         unsigned        reserved0_10    :2;     /* Reserved */
  39         unsigned        bpu             :1;     /* Block Position Unknown */
  40         unsigned        reserved0_543   :3;     /* Reserved */
  41         unsigned        eop             :1;     /* End Of Partition */
  42         unsigned        bop             :1;     /* Beginning Of Partition */
  43         u8              partition;              /* Partition Number */
  44         u8              reserved2, reserved3;   /* Reserved */
  45         u32             first_block;            /* First Block Location */
  46         u32             last_block;             /* Last Block Location (Optional) */
  47         u8              reserved12;             /* Reserved */
  48         u8              blocks_in_buffer[3];    /* Blocks In Buffer - (Optional) */
  49         u32             bytes_in_buffer;        /* Bytes In Buffer (Optional) */
  50 } idetape_read_position_result_t;
  51
  52 /*
  53  *      Follows structures which are related to the SELECT SENSE / MODE SENSE
  54  *      packet commands.
  55  */
  56 #define COMPRESSION_PAGE           0x0f
  57 #define COMPRESSION_PAGE_LENGTH    16
  58
  59 #define CAPABILITIES_PAGE          0x2a
  60 #define CAPABILITIES_PAGE_LENGTH   20
  61
  62 #define TAPE_PARAMTR_PAGE          0x2b
  63 #define TAPE_PARAMTR_PAGE_LENGTH   16
  64
  65 #define NUMBER_RETRIES_PAGE        0x2f
  66 #define NUMBER_RETRIES_PAGE_LENGTH 4
  67
  68 #define BLOCK_SIZE_PAGE            0x30
  69 #define BLOCK_SIZE_PAGE_LENGTH     4
  70
  71 #define BUFFER_FILLING_PAGE        0x33
  72 #define BUFFER_FILLING_PAGE_LENGTH 4
  73
  74 #define VENDOR_IDENT_PAGE          0x36
  75 #define VENDOR_IDENT_PAGE_LENGTH   8
  76
  77 #define LOCATE_STATUS_PAGE         0x37
  78 #define LOCATE_STATUS_PAGE_LENGTH  0
  79
  80 #define MODE_HEADER_LENGTH         4
  81
  82
  83 /*
  84  *      REQUEST SENSE packet command result - Data Format.
  85  */
  86 typedef struct {
  87         unsigned        error_code      :7;     /* Current of deferred errors */
  88         unsigned        valid           :1;     /* The information field conforms to QIC-157C */
  89         u8              reserved1       :8;     /* Segment Number - Reserved */
  90         unsigned        sense_key       :4;     /* Sense Key */
  91         unsigned        reserved2_4     :1;     /* Reserved */
  92         unsigned        ili             :1;     /* Incorrect Length Indicator */
  93         unsigned        eom             :1;     /* End Of Medium */
  94         unsigned        filemark        :1;     /* Filemark */
  95         u32             information __attribute__ ((packed));
  96         u8              asl;                    /* Additional sense length (n-7) */
  97         u32             command_specific;       /* Additional command specific information */
  98         u8              asc;                    /* Additional Sense Code */
  99         u8              ascq;                   /* Additional Sense Code Qualifier */
 100         u8              replaceable_unit_code;  /* Field Replaceable Unit Code */
 101         unsigned        sk_specific1    :7;     /* Sense Key Specific */
 102         unsigned        sksv            :1;     /* Sense Key Specific information is valid */
 103         u8              sk_specific2;           /* Sense Key Specific */
 104         u8              sk_specific3;           /* Sense Key Specific */
 105         u8              pad[2];                 /* Padding to 20 bytes */
 106 } idetape_request_sense_result_t;
 107
 108 /*
 109  *      Mode Parameter Header for the MODE SENSE packet command
 110  */
 111 typedef struct {
 112         u8              mode_data_length;       /* Length of the following data transfer */
 113         u8              medium_type;            /* Medium Type */
 114         u8              dsp;                    /* Device Specific Parameter */
 115         u8              bdl;                    /* Block Descriptor Length */
 116 } osst_mode_parameter_header_t;
 117
 118 /*
 119  *      Mode Parameter Block Descriptor the MODE SENSE packet command
 120  *
 121  *      Support for block descriptors is optional.
 122  */
 123 typedef struct {
 124         u8              density_code;           /* Medium density code */
 125         u8              blocks[3];              /* Number of blocks */
 126         u8              reserved4;              /* Reserved */
 127         u8              length[3];              /* Block Length */
 128 } osst_parameter_block_descriptor_t;
 129
 130 /*
 131  *      The Data Compression Page, as returned by the MODE SENSE packet command.
 132  */
 133 typedef struct {
 134 #if   defined(__BIG_ENDIAN_BITFIELD)
 135         unsigned        ps              :1;
 136         unsigned        reserved0       :1;     /* Reserved */
 137         unsigned        page_code       :6;     /* Page Code - Should be 0xf */
 138 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 139         unsigned        page_code       :6;     /* Page Code - Should be 0xf */
 140         unsigned        reserved0       :1;     /* Reserved */
 141         unsigned        ps              :1;
 142 #else
 143 #error "Please fix <asm/byteorder.h>"
 144 #endif
 145         u8              page_length;            /* Page Length - Should be 14 */
 146 #if   defined(__BIG_ENDIAN_BITFIELD)
 147         unsigned        dce             :1;     /* Data Compression Enable */
 148         unsigned        dcc             :1;     /* Data Compression Capable */
 149         unsigned        reserved2       :6;     /* Reserved */
 150 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 151         unsigned        reserved2       :6;     /* Reserved */
 152         unsigned        dcc             :1;     /* Data Compression Capable */
 153         unsigned        dce             :1;     /* Data Compression Enable */
 154 #else
 155 #error "Please fix <asm/byteorder.h>"
 156 #endif
 157 #if   defined(__BIG_ENDIAN_BITFIELD)
 158         unsigned        dde             :1;     /* Data Decompression Enable */
 159         unsigned        red             :2;     /* Report Exception on Decompression */
 160         unsigned        reserved3       :5;     /* Reserved */
 161 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 162         unsigned        reserved3       :5;     /* Reserved */
 163         unsigned        red             :2;     /* Report Exception on Decompression */
 164         unsigned        dde             :1;     /* Data Decompression Enable */
 165 #else
 166 #error "Please fix <asm/byteorder.h>"
 167 #endif
 168         u32             ca;                     /* Compression Algorithm */
 169         u32             da;                     /* Decompression Algorithm */
 170         u8              reserved[4];            /* Reserved */
 171 } osst_data_compression_page_t;
 172
 173 /*
 174  *      The Medium Partition Page, as returned by the MODE SENSE packet command.
 175  */
 176 typedef struct {
 177 #if   defined(__BIG_ENDIAN_BITFIELD)
 178         unsigned        ps              :1;
 179         unsigned        reserved1_6     :1;     /* Reserved */
 180         unsigned        page_code       :6;     /* Page Code - Should be 0x11 */
 181 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 182         unsigned        page_code       :6;     /* Page Code - Should be 0x11 */
 183         unsigned        reserved1_6     :1;     /* Reserved */
 184         unsigned        ps              :1;
 185 #else
 186 #error "Please fix <asm/byteorder.h>"
 187 #endif
 188         u8              page_length;            /* Page Length - Should be 6 */
 189         u8              map;                    /* Maximum Additional Partitions - Should be 0 */
 190         u8              apd;                    /* Additional Partitions Defined - Should be 0 */
 191 #if   defined(__BIG_ENDIAN_BITFIELD)
 192         unsigned        fdp             :1;     /* Fixed Data Partitions */
 193         unsigned        sdp             :1;     /* Should be 0 */
 194         unsigned        idp             :1;     /* Should be 0 */
 195         unsigned        psum            :2;     /* Should be 0 */
 196         unsigned        reserved4_012   :3;     /* Reserved */
 197 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 198         unsigned        reserved4_012   :3;     /* Reserved */
 199         unsigned        psum            :2;     /* Should be 0 */
 200         unsigned        idp             :1;     /* Should be 0 */
 201         unsigned        sdp             :1;     /* Should be 0 */
 202         unsigned        fdp             :1;     /* Fixed Data Partitions */
 203 #else
 204 #error "Please fix <asm/byteorder.h>"
 205 #endif
 206         u8              mfr;                    /* Medium Format Recognition */
 207         u8              reserved[2];            /* Reserved */
 208 } osst_medium_partition_page_t;
 209
 210 /*
 211  *      Capabilities and Mechanical Status Page
 212  */
 213 typedef struct {
 214 #if   defined(__BIG_ENDIAN_BITFIELD)
 215         unsigned        reserved1_67    :2;
 216         unsigned        page_code       :6;     /* Page code - Should be 0x2a */
 217 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 218         unsigned        page_code       :6;     /* Page code - Should be 0x2a */
 219         unsigned        reserved1_67    :2;
 220 #else
 221 #error "Please fix <asm/byteorder.h>"
 222 #endif
 223         u8              page_length;            /* Page Length - Should be 0x12 */
 224         u8              reserved2, reserved3;
 225 #if   defined(__BIG_ENDIAN_BITFIELD)
 226         unsigned        reserved4_67    :2;
 227         unsigned        sprev           :1;     /* Supports SPACE in the reverse direction */
 228         unsigned        reserved4_1234  :4;
 229         unsigned        ro              :1;     /* Read Only Mode */
 230 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 231         unsigned        ro              :1;     /* Read Only Mode */
 232         unsigned        reserved4_1234  :4;
 233         unsigned        sprev           :1;     /* Supports SPACE in the reverse direction */
 234         unsigned        reserved4_67    :2;
 235 #else
 236 #error "Please fix <asm/byteorder.h>"
 237 #endif
 238 #if   defined(__BIG_ENDIAN_BITFIELD)
 239         unsigned        reserved5_67    :2;
 240         unsigned        qfa             :1;     /* Supports the QFA two partition formats */
 241         unsigned        reserved5_4     :1;
 242         unsigned        efmt            :1;     /* Supports ERASE command initiated formatting */
 243         unsigned        reserved5_012   :3;
 244 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 245         unsigned        reserved5_012   :3;
 246         unsigned        efmt            :1;     /* Supports ERASE command initiated formatting */
 247         unsigned        reserved5_4     :1;
 248         unsigned        qfa             :1;     /* Supports the QFA two partition formats */
 249         unsigned        reserved5_67    :2;
 250 #else
 251 #error "Please fix <asm/byteorder.h>"
 252 #endif
 253 #if   defined(__BIG_ENDIAN_BITFIELD)
 254         unsigned        cmprs           :1;     /* Supports data compression */
 255         unsigned        ecc             :1;     /* Supports error correction */
 256         unsigned        reserved6_45    :2;     /* Reserved */
 257         unsigned        eject           :1;     /* The device can eject the volume */
 258         unsigned        prevent         :1;     /* The device defaults in the prevent state after power up */
 259         unsigned        locked          :1;     /* The volume is locked */
 260         unsigned        lock            :1;     /* Supports locking the volume */
 261 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 262         unsigned        lock            :1;     /* Supports locking the volume */
 263         unsigned        locked          :1;     /* The volume is locked */
 264         unsigned        prevent         :1;     /* The device defaults in the prevent state after power up */
 265         unsigned        eject           :1;     /* The device can eject the volume */
 266         unsigned        reserved6_45    :2;     /* Reserved */
 267         unsigned        ecc             :1;     /* Supports error correction */
 268         unsigned        cmprs           :1;     /* Supports data compression */
 269 #else
 270 #error "Please fix <asm/byteorder.h>"
 271 #endif
 272 #if   defined(__BIG_ENDIAN_BITFIELD)
 273         unsigned        blk32768        :1;     /* slowb - the device restricts the byte count for PIO */
 274                                                 /* transfers for slow buffer memory ??? */
 275                                                 /* Also 32768 block size in some cases */
 276         unsigned        reserved7_3_6   :4;
 277         unsigned        blk1024         :1;     /* Supports 1024 bytes block size */
 278         unsigned        blk512          :1;     /* Supports 512 bytes block size */
 279         unsigned        reserved7_0     :1;
 280 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 281         unsigned        reserved7_0     :1;
 282         unsigned        blk512          :1;     /* Supports 512 bytes block size */
 283         unsigned        blk1024         :1;     /* Supports 1024 bytes block size */
 284         unsigned        reserved7_3_6   :4;
 285         unsigned        blk32768        :1;     /* slowb - the device restricts the byte count for PIO */
 286                                                 /* transfers for slow buffer memory ??? */
 287                                                 /* Also 32768 block size in some cases */
 288 #else
 289 #error "Please fix <asm/byteorder.h>"
 290 #endif
 291         u16             max_speed;              /* Maximum speed supported in KBps */
 292         u8              reserved10, reserved11;
 293         u16             ctl;                    /* Continuous Transfer Limit in blocks */
 294         u16             speed;                  /* Current Speed, in KBps */
 295         u16             buffer_size;            /* Buffer Size, in 512 bytes */
 296         u8              reserved18, reserved19;
 297 } osst_capabilities_page_t;
 298
 299 /*
 300  *      Block Size Page
 301  */
 302 typedef struct {
 303 #if   defined(__BIG_ENDIAN_BITFIELD)
 304         unsigned        ps              :1;
 305         unsigned        reserved1_6     :1;
 306         unsigned        page_code       :6;     /* Page code - Should be 0x30 */
 307 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 308         unsigned        page_code       :6;     /* Page code - Should be 0x30 */
 309         unsigned        reserved1_6     :1;
 310         unsigned        ps              :1;
 311 #else
 312 #error "Please fix <asm/byteorder.h>"
 313 #endif
 314         u8              page_length;            /* Page Length - Should be 2 */
 315         u8              reserved2;
 316 #if   defined(__BIG_ENDIAN_BITFIELD)
 317         unsigned        one             :1;
 318         unsigned        reserved2_6     :1;
 319         unsigned        record32_5      :1;
 320         unsigned        record32        :1;
 321         unsigned        reserved2_23    :2;
 322         unsigned        play32_5        :1;
 323         unsigned        play32          :1;
 324 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 325         unsigned        play32          :1;
 326         unsigned        play32_5        :1;
 327         unsigned        reserved2_23    :2;
 328         unsigned        record32        :1;
 329         unsigned        record32_5      :1;
 330         unsigned        reserved2_6     :1;
 331         unsigned        one             :1;
 332 #else
 333 #error "Please fix <asm/byteorder.h>"
 334 #endif
 335 } osst_block_size_page_t;
 336
 337 /*
 338  *      Tape Parameters Page
 339  */
 340 typedef struct {
 341 #if   defined(__BIG_ENDIAN_BITFIELD)
 342         unsigned        ps              :1;
 343         unsigned        reserved1_6     :1;
 344         unsigned        page_code       :6;     /* Page code - Should be 0x2b */
 345 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 346         unsigned        page_code       :6;     /* Page code - Should be 0x2b */
 347         unsigned        reserved1_6     :1;
 348         unsigned        ps              :1;
 349 #else
 350 #error "Please fix <asm/byteorder.h>"
 351 #endif
 352         u8              reserved2;
 353         u8              density;
 354         u8              reserved3,reserved4;
 355         u16             segtrk;
 356         u16             trks;
 357         u8              reserved5,reserved6,reserved7,reserved8,reserved9,reserved10;
 358 } osst_tape_paramtr_page_t;
 359
 360 /* OnStream definitions */
 361
 362 #define OS_CONFIG_PARTITION     (0xff)
 363 #define OS_DATA_PARTITION       (0)
 364 #define OS_PARTITION_VERSION    (1)
 365
 366 /*
 367  * partition
 368  */
 369 typedef struct os_partition_s {
 370         __u8    partition_num;
 371         __u8    par_desc_ver;
 372         __u16   wrt_pass_cntr;
 373         __u32   first_frame_ppos;
 374         __u32   last_frame_ppos;
 375         __u32   eod_frame_ppos;
 376 } os_partition_t;
 377
 378 /*
 379  * DAT entry
 380  */
 381 typedef struct os_dat_entry_s {
 382         __u32   blk_sz;
 383         __u16   blk_cnt;
 384         __u8    flags;
 385         __u8    reserved;
 386 } os_dat_entry_t;
 387
 388 /*
 389  * DAT
 390  */
 391 #define OS_DAT_FLAGS_DATA       (0xc)
 392 #define OS_DAT_FLAGS_MARK       (0x1)
 393
 394 typedef struct os_dat_s {
 395         __u8            dat_sz;
 396         __u8            reserved1;
 397         __u8            entry_cnt;
 398         __u8            reserved3;
 399         os_dat_entry_t  dat_list[16];
 400 } os_dat_t;
 401
 402 /*
 403  * Frame types
 404  */
 405 #define OS_FRAME_TYPE_FILL      (0)
 406 #define OS_FRAME_TYPE_EOD       (1 << 0)
 407 #define OS_FRAME_TYPE_MARKER    (1 << 1)
 408 #define OS_FRAME_TYPE_HEADER    (1 << 3)
 409 #define OS_FRAME_TYPE_DATA      (1 << 7)
 410
 411 /*
 412  * AUX
 413  */
 414 typedef struct os_aux_s {
 415         __u32           format_id;              /* hardware compability AUX is based on */
 416         char            application_sig[4];     /* driver used to write this media */
 417         __u32           hdwr;                   /* reserved */
 418         __u32           update_frame_cntr;      /* for configuration frame */
 419         __u8            frame_type;
 420         __u8            frame_type_reserved;
 421         __u8            reserved_18_19[2];
 422         os_partition_t  partition;
 423         __u8            reserved_36_43[8];
 424         __u32           frame_seq_num;
 425         __u32           logical_blk_num_high;
 426         __u32           logical_blk_num;
 427         os_dat_t        dat;
 428         __u8            reserved188_191[4];
 429         __u32           filemark_cnt;
 430         __u32           phys_fm;
 431         __u32           last_mark_ppos;
 432         __u8            reserved204_223[20];
 433
 434         /*
 435          * __u8         app_specific[32];
 436          *
 437          * Linux specific fields:
 438          */
 439          __u32          next_mark_ppos;         /* when known, points to next marker */
 440          __u32          last_mark_lbn;          /* storing log_blk_num of last mark is extends ADR spec */
 441          __u8           linux_specific[24];
 442
 443         __u8            reserved_256_511[256];
 444 } os_aux_t;
 445
 446 #define OS_FM_TAB_MAX 1024
 447
 448 typedef struct os_fm_tab_s {
 449         __u8            fm_part_num;
 450         __u8            reserved_1;
 451         __u8            fm_tab_ent_sz;
 452         __u8            reserved_3;
 453         __u16           fm_tab_ent_cnt;
 454         __u8            reserved6_15[10];
 455         __u32           fm_tab_ent[OS_FM_TAB_MAX];
 456 } os_fm_tab_t;
 457
 458 typedef struct os_ext_trk_ey_s {
 459         __u8            et_part_num;
 460         __u8            fmt;
 461         __u16           fm_tab_off;
 462         __u8            reserved4_7[4];
 463         __u32           last_hlb_hi;
 464         __u32           last_hlb;
 465         __u32           last_pp;
 466         __u8            reserved20_31[12];
 467 } os_ext_trk_ey_t;
 468
 469 typedef struct os_ext_trk_tb_s {
 470         __u8            nr_stream_part;
 471         __u8            reserved_1;
 472         __u8            et_ent_sz;
 473         __u8            reserved3_15[13];
 474         os_ext_trk_ey_t dat_ext_trk_ey;
 475         os_ext_trk_ey_t qfa_ext_trk_ey;
 476 } os_ext_trk_tb_t;
 477
 478 typedef struct os_header_s {
 479         char            ident_str[8];
 480         __u8            major_rev;
 481         __u8            minor_rev;
 482         __u16           ext_trk_tb_off;
 483         __u8            reserved12_15[4];
 484         __u8            pt_par_num;
 485         __u8            pt_reserved1_3[3];
 486         os_partition_t  partition[16];
 487         __u32           cfg_col_width;
 488         __u32           dat_col_width;
 489         __u32           qfa_col_width;
 490         __u8            cartridge[16];
 491         __u8            reserved304_511[208];
 492         __u32           old_filemark_list[16680/4];             /* in ADR 1.4 __u8 track_table[16680] */
 493         os_ext_trk_tb_t ext_track_tb;
 494         __u8            reserved17272_17735[464];
 495         os_fm_tab_t     dat_fm_tab;
 496         os_fm_tab_t     qfa_fm_tab;
 497         __u8            reserved25960_32767[6808];
 498 } os_header_t;
 499
 500
 501 /*
 502  * OnStream ADRL frame
 503  */
 504 #define OS_FRAME_SIZE   (32 * 1024 + 512)
 505 #define OS_DATA_SIZE    (32 * 1024)
 506 #define OS_AUX_SIZE     (512)
 507 //#define OSST_MAX_SG      2
 508
 509 /* The OnStream tape buffer descriptor. */
 510 struct osst_buffer {
 511   unsigned char in_use;
 512   unsigned char dma;    /* DMA-able buffer */
 513   int buffer_size;
 514   int buffer_blocks;
 515   int buffer_bytes;
 516   int read_pointer;
 517   int writing;
 518   int midlevel_result;
 519   int syscall_result;
 520   struct osst_request *last_SRpnt;
 521   struct st_cmdstatus cmdstat;
 522   unsigned char *b_data;
 523   os_aux_t *aux;               /* onstream AUX structure at end of each block     */
 524   unsigned short use_sg;       /* zero or number of s/g segments for this adapter */
 525   unsigned short sg_segs;      /* number of segments in s/g list                  */
 526   unsigned short orig_sg_segs; /* number of segments allocated at first try       */
 527   struct scatterlist sg[1];    /* MUST BE last item                               */
 528 } ;
 529
 530 /* The OnStream tape drive descriptor */
 531 struct osst_tape {
 532   struct scsi_driver *driver;
 533   unsigned capacity;
 534   struct scsi_device *device;
 535   struct semaphore lock;       /* for serialization */
 536   struct completion wait;      /* for SCSI commands */
 537   struct osst_buffer * buffer;
 538
 539   /* Drive characteristics */
 540   unsigned char omit_blklims;
 541   unsigned char do_auto_lock;
 542   unsigned char can_bsr;
 543   unsigned char can_partitions;
 544   unsigned char two_fm;
 545   unsigned char fast_mteom;
 546   unsigned char restr_dma;
 547   unsigned char scsi2_logical;
 548   unsigned char default_drvbuffer;  /* 0xff = don't touch, value 3 bits */
 549   unsigned char pos_unknown;        /* after reset position unknown */
 550   int write_threshold;
 551   int timeout;                  /* timeout for normal commands */
 552   int long_timeout;             /* timeout for commands known to take long time*/
 553
 554   /* Mode characteristics */
 555   struct st_modedef modes[ST_NBR_MODES];
 556   int current_mode;
 557
 558   /* Status variables */
 559   int partition;
 560   int new_partition;
 561   int nbr_partitions;    /* zero until partition support enabled */
 562   struct st_partstat ps[ST_NBR_PARTITIONS];
 563   unsigned char dirty;
 564   unsigned char ready;
 565   unsigned char write_prot;
 566   unsigned char drv_write_prot;
 567   unsigned char in_use;
 568   unsigned char blksize_changed;
 569   unsigned char density_changed;
 570   unsigned char compression_changed;
 571   unsigned char drv_buffer;
 572   unsigned char density;
 573   unsigned char door_locked;
 574   unsigned char rew_at_close;
 575   unsigned char inited;
 576   int block_size;
 577   int min_block;
 578   int max_block;
 579   int recover_count;            /* from tape opening */
 580   int abort_count;
 581   int write_count;
 582   int read_count;
 583   int recover_erreg;            /* from last status call */
 584   /*
 585    * OnStream specific data
 586    */
 587   int      os_fw_rev;                          /* the firmware revision * 10000 */
 588   unsigned char  raw;                          /* flag OnStream raw access (32.5KB block size) */
 589   unsigned char  poll;                         /* flag that this drive needs polling (IDE|firmware) */
 590   unsigned char  frame_in_buffer;              /* flag that the frame as per frame_seq_number
 591                                                 * has been read into STp->buffer and is valid */
 592   int      frame_seq_number;                   /* logical frame number */
 593   int      logical_blk_num;                    /* logical block number */
 594   unsigned first_frame_position;               /* physical frame to be transferred to/from host */
 595   unsigned last_frame_position;                /* physical frame to be transferd to/from tape */
 596   int      cur_frames;                         /* current number of frames in internal buffer */
 597   int      max_frames;                         /* max number of frames in internal buffer */
 598   char     application_sig[5];                 /* application signature */
 599   unsigned char  fast_open;                    /* flag that reminds us we didn't check headers at open */
 600   unsigned short wrt_pass_cntr;                /* write pass counter */
 601   int      update_frame_cntr;                  /* update frame counter */
 602   int      onstream_write_error;               /* write error recovery active */
 603   int      header_ok;                          /* header frame verified ok */
 604   int      linux_media;                        /* reading linux-specifc media */
 605   int      linux_media_version;
 606   os_header_t * header_cache;                  /* cache is kept for filemark positions */
 607   int      filemark_cnt;
 608   int      first_mark_ppos;
 609   int      last_mark_ppos;
 610   int      last_mark_lbn;                       /* storing log_blk_num of last mark is extends ADR spec */
 611   int      first_data_ppos;
 612   int      eod_frame_ppos;
 613   int      eod_frame_lfa;
 614   int      write_type;                          /* used in write error recovery */
 615   int      read_error_frame;                    /* used in read error recovery */
 616   unsigned long cmd_start_time;
 617   unsigned long max_cmd_time;
 618
 619 #if DEBUG
 620   unsigned char write_pending;
 621   int nbr_finished;
 622   int nbr_waits;
 623   unsigned char last_cmnd[6];
 624   unsigned char last_sense[16];
 625 #endif
 626   struct gendisk *drive;
 627 } ;
 628
 629 /* scsi tape command */
 630 struct osst_request {
 631         unsigned char cmd[MAX_COMMAND_SIZE];
 632         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 633         int result;
 634         struct osst_tape *stp;
 635         struct completion *waiting;
 636 };
 637
 638 /* Values of write_type */
 639 #define OS_WRITE_DATA      0
 640 #define OS_WRITE_EOD       1
 641 #define OS_WRITE_NEW_MARK  2
 642 #define OS_WRITE_LAST_MARK 3
 643 #define OS_WRITE_HEADER    4
 644 #define OS_WRITE_FILLER    5
 645
 646 /* Additional rw state */
 647 #define OS_WRITING_COMPLETE 3