root/drivers/scsi/st.h

/* */

INCLUDED FROM

   1 
   2 #ifndef _ST_H
   3         #define _ST_H
   4 /*
   5         $Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/st.h,v 1.1 1992/04/24 18:01:50 root Exp root $
   6 */
   7 
   8 #ifndef _SCSI_H
   9 #include "scsi.h"
  10 #endif
  11 
  12 /* The tape buffer descriptor. */
  13 typedef struct {
  14   unsigned char in_use;
  15   unsigned char dma;    /* DMA-able buffer */
  16   int buffer_size;
  17   int buffer_blocks;
  18   int buffer_bytes;
  19   int read_pointer;
  20   int writing;
  21   int last_result;
  22   int last_result_fatal;
  23   unsigned char *b_data;
  24   int orig_size;
  25   unsigned char *orig_b_data;
  26 } ST_buffer;
  27 
  28 
  29 /* The tape mode definition */
  30 typedef struct {
  31   unsigned char defined;
  32   unsigned char do_async_writes;
  33   unsigned char do_buffer_writes;
  34   unsigned char do_read_ahead;
  35   unsigned char defaults_for_writes;
  36   unsigned char default_compression; /* 0 = don't touch, etc */
  37   short default_density; /* Forced density, -1 = no value */
  38   int default_blksize;  /* Forced blocksize, -1 = no value */
  39 } ST_mode;
  40 
  41 #define ST_NBR_MODE_BITS 2
  42 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
  43 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
  44 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
  45 
  46 /* The status related to each partition */
  47 typedef struct {
  48   unsigned char rw;
  49   unsigned char moves_after_eof;
  50   unsigned char at_sm;
  51   unsigned char last_block_valid;
  52   u32 last_block_visited;
  53 } ST_partstat;
  54 
  55 #define ST_NBR_PARTITIONS 4
  56 
  57 /* The tape drive descriptor */
  58 typedef struct {
  59   kdev_t devt;
  60   unsigned capacity;
  61   struct wait_queue * waiting;
  62   Scsi_Device* device;
  63   Scsi_Cmnd SCpnt;
  64   struct semaphore sem;
  65   ST_buffer * buffer;
  66 
  67   /* Drive characteristics */
  68   unsigned char omit_blklims;
  69   unsigned char do_auto_lock;
  70   unsigned char can_bsr;
  71   unsigned char can_partitions;
  72   unsigned char two_fm;
  73   unsigned char fast_mteom;
  74   unsigned char restr_dma;
  75   unsigned char scsi2_logical;
  76   unsigned char default_drvbuffer;  /* 0xff = don't touch, value 3 bits */
  77   int write_threshold;
  78 
  79   /* Mode characteristics */
  80   ST_mode modes[ST_NBR_MODES];
  81   int current_mode;
  82 
  83   /* Status variables */
  84   int partition;
  85   int new_partition;
  86   int nbr_partitions;    /* zero until partition support enabled */
  87   ST_partstat ps[ST_NBR_PARTITIONS];
  88   unsigned char dirty;
  89   unsigned char ready;
  90   unsigned char eof;
  91   unsigned char write_prot;
  92   unsigned char drv_write_prot;
  93   unsigned char in_use;
  94   unsigned char eof_hit;
  95   unsigned char blksize_changed;
  96   unsigned char density_changed;
  97   unsigned char compression_changed;
  98   unsigned char drv_buffer;
  99   unsigned char density;
 100   unsigned char door_locked;
 101   unsigned char rew_at_close;
 102   int block_size;
 103   int min_block;
 104   int max_block;
 105   int recover_count;
 106   int drv_block;        /* The block where the drive head is */
 107   struct mtget * mt_status;
 108 
 109 #if DEBUG
 110   unsigned char write_pending;
 111   int nbr_finished;
 112   int nbr_waits;
 113 #endif
 114 } Scsi_Tape;
 115 
 116 extern Scsi_Tape * scsi_tapes;
 117 
 118 /* Values of eof */
 119 #define ST_NOEOF        0
 120 #define ST_FM           1
 121 #define ST_EOM_OK       2
 122 #define ST_EOM_ERROR    3
 123 #define ST_EOD          4
 124 
 125 /* Values of rw */
 126 #define ST_IDLE         0
 127 #define ST_READING      1
 128 #define ST_WRITING      2
 129 
 130 /* Values of ready state */
 131 #define ST_READY        0
 132 #define ST_NOT_READY    1
 133 #define ST_NO_TAPE      2
 134 
 135 /* Values for door lock state */
 136 #define ST_UNLOCKED     0
 137 #define ST_LOCKED_EXPLICIT 1
 138 #define ST_LOCKED_AUTO  2
 139 #define ST_LOCK_FAILS   3
 140 
 141 /* Positioning SCSI-commands for Tandberg, etc. drives */
 142 #define QFA_REQUEST_BLOCK       0x02
 143 #define QFA_SEEK_BLOCK          0x0c
 144 
 145 /* Setting the binary options */
 146 #define ST_DONT_TOUCH  0
 147 #define ST_NO          1
 148 #define ST_YES         2
 149 
 150 #endif
 151 

/* */