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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 */
14typedef 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 */
39typedef 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 */
88typedef 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 */
113typedef 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 */
125typedef 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 */
135typedef 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 */
178typedef 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 */
215typedef 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 */
304typedef 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 */
342typedef 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 */
371typedef 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 */
383typedef 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
396typedef 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 */
416typedef 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
450typedef 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
460typedef 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
471typedef 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
480typedef 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. */
512struct 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 */
534struct 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 */
633struct 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