blob: c29455fa6deb5693f4664d4fdee515ce02502178 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
#ifndef _ST_H
#define _ST_H
/*
$Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/st.h,v 1.1 1992/04/24 18:01:50 root Exp root $
*/
#ifndef _SCSI_H
#include "scsi.h"
#endif
/* The tape buffer descriptor. */
typedef struct {
unsigned char in_use;
unsigned char dma; /* DMA-able buffer */
int buffer_size;
int buffer_blocks;
int buffer_bytes;
int read_pointer;
int writing;
int last_result;
int last_result_fatal;
unsigned char *b_data;
int orig_size;
unsigned char *orig_b_data;
} ST_buffer;
/* The tape mode definition */
typedef struct {
unsigned char defined;
unsigned char sysv; /* SYS V semantics? */
unsigned char do_async_writes;
unsigned char do_buffer_writes;
unsigned char do_read_ahead;
unsigned char defaults_for_writes;
unsigned char default_compression; /* 0 = don't touch, etc */
short default_density; /* Forced density, -1 = no value */
int default_blksize; /* Forced blocksize, -1 = no value */
} ST_mode;
#define ST_NBR_MODE_BITS 2
#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
/* The status related to each partition */
typedef struct {
unsigned char rw;
unsigned char eof;
unsigned char at_sm;
unsigned char last_block_valid;
u32 last_block_visited;
int drv_block; /* The block where the drive head is */
int drv_file;
} ST_partstat;
#define ST_NBR_PARTITIONS 4
/* The tape drive descriptor */
typedef struct {
kdev_t devt;
unsigned capacity;
struct wait_queue * waiting;
Scsi_Device* device;
Scsi_Cmnd SCpnt;
struct semaphore sem;
ST_buffer * buffer;
/* Drive characteristics */
unsigned char omit_blklims;
unsigned char do_auto_lock;
unsigned char can_bsr;
unsigned char can_partitions;
unsigned char two_fm;
unsigned char fast_mteom;
unsigned char restr_dma;
unsigned char scsi2_logical;
unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
int write_threshold;
/* Mode characteristics */
ST_mode modes[ST_NBR_MODES];
int current_mode;
/* Status variables */
int partition;
int new_partition;
int nbr_partitions; /* zero until partition support enabled */
ST_partstat ps[ST_NBR_PARTITIONS];
unsigned char dirty;
unsigned char ready;
unsigned char write_prot;
unsigned char drv_write_prot;
unsigned char in_use;
unsigned char blksize_changed;
unsigned char density_changed;
unsigned char compression_changed;
unsigned char drv_buffer;
unsigned char density;
unsigned char door_locked;
unsigned char rew_at_close;
int block_size;
int min_block;
int max_block;
int recover_count;
struct mtget * mt_status;
#if DEBUG
unsigned char write_pending;
int nbr_finished;
int nbr_waits;
unsigned char last_cmnd[6];
unsigned char last_sense[16];
#endif
} Scsi_Tape;
extern Scsi_Tape * scsi_tapes;
/* Values of eof */
#define ST_NOEOF 0
#define ST_FM_HIT 1
#define ST_FM 2
#define ST_EOM_OK 3
#define ST_EOM_ERROR 4
#define ST_EOD_1 5
#define ST_EOD_2 6
#define ST_EOD 7
/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
return zero => ST_EOD, return ENOSPC */
/* Values of rw */
#define ST_IDLE 0
#define ST_READING 1
#define ST_WRITING 2
/* Values of ready state */
#define ST_READY 0
#define ST_NOT_READY 1
#define ST_NO_TAPE 2
/* Values for door lock state */
#define ST_UNLOCKED 0
#define ST_LOCKED_EXPLICIT 1
#define ST_LOCKED_AUTO 2
#define ST_LOCK_FAILS 3
/* Positioning SCSI-commands for Tandberg, etc. drives */
#define QFA_REQUEST_BLOCK 0x02
#define QFA_SEEK_BLOCK 0x0c
/* Setting the binary options */
#define ST_DONT_TOUCH 0
#define ST_NO 1
#define ST_YES 2
#endif
|
