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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