linux/drivers/scsi/st.h
<<
>>
Prefs
   1
   2#ifndef _ST_H
   3#define _ST_H
   4
   5#include <linux/completion.h>
   6#include <linux/mutex.h>
   7#include <linux/kref.h>
   8#include <scsi/scsi_cmnd.h>
   9
  10/* Descriptor for analyzed sense data */
  11struct st_cmdstatus {
  12        int midlevel_result;
  13        struct scsi_sense_hdr sense_hdr;
  14        int have_sense;
  15        int residual;
  16        u64 uremainder64;
  17        u8 flags;
  18        u8 remainder_valid;
  19        u8 fixed_format;
  20        u8 deferred;
  21};
  22
  23struct scsi_tape;
  24
  25/* scsi tape command */
  26struct st_request {
  27        unsigned char cmd[MAX_COMMAND_SIZE];
  28        unsigned char sense[SCSI_SENSE_BUFFERSIZE];
  29        int result;
  30        struct scsi_tape *stp;
  31        struct completion *waiting;
  32        struct bio *bio;
  33};
  34
  35/* The tape buffer descriptor. */
  36struct st_buffer {
  37        unsigned char dma;      /* DMA-able buffer */
  38        unsigned char cleared;  /* internal buffer cleared after open? */
  39        unsigned short do_dio;  /* direct i/o set up? */
  40        int buffer_size;
  41        int buffer_blocks;
  42        int buffer_bytes;
  43        int read_pointer;
  44        int writing;
  45        int syscall_result;
  46        struct st_request *last_SRpnt;
  47        struct st_cmdstatus cmdstat;
  48        struct page **reserved_pages;
  49        int reserved_page_order;
  50        struct page **mapped_pages;
  51        struct rq_map_data map_data;
  52        unsigned char *b_data;
  53        unsigned short use_sg;  /* zero or max number of s/g segments for this adapter */
  54        unsigned short sg_segs;         /* number of segments in s/g list */
  55        unsigned short frp_segs;        /* number of buffer segments */
  56};
  57
  58/* The tape mode definition */
  59struct st_modedef {
  60        unsigned char defined;
  61        unsigned char sysv;     /* SYS V semantics? */
  62        unsigned char do_async_writes;
  63        unsigned char do_buffer_writes;
  64        unsigned char do_read_ahead;
  65        unsigned char defaults_for_writes;
  66        unsigned char default_compression;      /* 0 = don't touch, etc */
  67        short default_density;  /* Forced density, -1 = no value */
  68        int default_blksize;    /* Forced blocksize, -1 = no value */
  69        struct cdev *cdevs[2];  /* Auto-rewind and non-rewind devices */
  70};
  71
  72/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
  73   number of modes is 16 (ST_NBR_MODE_BITS 4) */
  74#define ST_NBR_MODE_BITS 2
  75#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
  76#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
  77#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
  78
  79#define ST_MAX_TAPES 128
  80#define ST_MAX_TAPE_ENTRIES  (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
  81
  82/* The status related to each partition */
  83struct st_partstat {
  84        unsigned char rw;
  85        unsigned char eof;
  86        unsigned char at_sm;
  87        unsigned char last_block_valid;
  88        u32 last_block_visited;
  89        int drv_block;          /* The block where the drive head is */
  90        int drv_file;
  91};
  92
  93#define ST_NBR_PARTITIONS 4
  94
  95/* The tape drive descriptor */
  96struct scsi_tape {
  97        struct scsi_driver *driver;
  98        struct scsi_device *device;
  99        struct mutex lock;      /* For serialization */
 100        struct completion wait; /* For SCSI commands */
 101        struct st_buffer *buffer;
 102
 103        /* Drive characteristics */
 104        unsigned char omit_blklims;
 105        unsigned char do_auto_lock;
 106        unsigned char can_bsr;
 107        unsigned char can_partitions;
 108        unsigned char two_fm;
 109        unsigned char fast_mteom;
 110        unsigned char immediate;
 111        unsigned char restr_dma;
 112        unsigned char scsi2_logical;
 113        unsigned char default_drvbuffer;        /* 0xff = don't touch, value 3 bits */
 114        unsigned char cln_mode;                 /* 0 = none, otherwise sense byte nbr */
 115        unsigned char cln_sense_value;
 116        unsigned char cln_sense_mask;
 117        unsigned char use_pf;                   /* Set Page Format bit in all mode selects? */
 118        unsigned char try_dio;                  /* try direct i/o in general? */
 119        unsigned char try_dio_now;              /* try direct i/o before next close? */
 120        unsigned char c_algo;                   /* compression algorithm */
 121        unsigned char pos_unknown;                      /* after reset position unknown */
 122        unsigned char sili;                     /* use SILI when reading in variable b mode */
 123        unsigned char immediate_filemark;       /* write filemark immediately */
 124        int tape_type;
 125        int long_timeout;       /* timeout for commands known to take long time */
 126
 127        unsigned long max_pfn;  /* the maximum page number reachable by the HBA */
 128
 129        /* Mode characteristics */
 130        struct st_modedef modes[ST_NBR_MODES];
 131        int current_mode;
 132
 133        /* Status variables */
 134        int partition;
 135        int new_partition;
 136        int nbr_partitions;     /* zero until partition support enabled */
 137        struct st_partstat ps[ST_NBR_PARTITIONS];
 138        unsigned char dirty;
 139        unsigned char ready;
 140        unsigned char write_prot;
 141        unsigned char drv_write_prot;
 142        unsigned char in_use;
 143        unsigned char blksize_changed;
 144        unsigned char density_changed;
 145        unsigned char compression_changed;
 146        unsigned char drv_buffer;
 147        unsigned char density;
 148        unsigned char door_locked;
 149        unsigned char autorew_dev;   /* auto-rewind device */
 150        unsigned char rew_at_close;  /* rewind necessary at close */
 151        unsigned char inited;
 152        unsigned char cleaning_req;  /* cleaning requested? */
 153        int block_size;
 154        int min_block;
 155        int max_block;
 156        int recover_count;     /* From tape opening */
 157        int recover_reg;       /* From last status call */
 158
 159#if DEBUG
 160        unsigned char write_pending;
 161        int nbr_finished;
 162        int nbr_waits;
 163        int nbr_requests;
 164        int nbr_dio;
 165        int nbr_pages;
 166        unsigned char last_cmnd[6];
 167        unsigned char last_sense[16];
 168#endif
 169        struct gendisk *disk;
 170        struct kref     kref;
 171};
 172
 173/* Bit masks for use_pf */
 174#define USE_PF      1
 175#define PF_TESTED   2
 176
 177/* Values of eof */
 178#define ST_NOEOF        0
 179#define ST_FM_HIT       1
 180#define ST_FM           2
 181#define ST_EOM_OK       3
 182#define ST_EOM_ERROR    4
 183#define ST_EOD_1        5
 184#define ST_EOD_2        6
 185#define ST_EOD          7
 186/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
 187   return zero => ST_EOD, return ENOSPC */
 188/* When writing: ST_EOM_OK == early warning found, write OK
 189                 ST_EOD_1  == allow trying new write after early warning
 190                 ST_EOM_ERROR == early warning found, not able to write all */
 191
 192/* Values of rw */
 193#define ST_IDLE         0
 194#define ST_READING      1
 195#define ST_WRITING      2
 196
 197/* Values of ready state */
 198#define ST_READY        0
 199#define ST_NOT_READY    1
 200#define ST_NO_TAPE      2
 201
 202/* Values for door lock state */
 203#define ST_UNLOCKED     0
 204#define ST_LOCKED_EXPLICIT 1
 205#define ST_LOCKED_AUTO  2
 206#define ST_LOCK_FAILS   3
 207
 208/* Positioning SCSI-commands for Tandberg, etc. drives */
 209#define QFA_REQUEST_BLOCK       0x02
 210#define QFA_SEEK_BLOCK          0x0c
 211
 212/* Setting the binary options */
 213#define ST_DONT_TOUCH  0
 214#define ST_NO          1
 215#define ST_YES         2
 216
 217#define EXTENDED_SENSE_START  18
 218
 219/* Masks for some conditions in the sense data */
 220#define SENSE_FMK   0x80
 221#define SENSE_EOM   0x40
 222#define SENSE_ILI   0x20
 223
 224#endif
 225
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.