8 #include <linux/completion.h>
10 /* The tape buffer descriptor. */
13 unsigned char dma; /* DMA-able buffer */
14 unsigned char do_dio; /* direct i/o set up? */
22 Scsi_Request *last_SRpnt;
23 unsigned char *b_data;
24 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
25 unsigned short sg_segs; /* number of segments in s/g list */
26 unsigned short orig_frp_segs; /* number of segments allocated at first try */
27 unsigned short frp_segs; /* number of buffer segments */
28 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */
29 struct st_buf_fragment *frp; /* the allocated buffer fragment list */
30 struct scatterlist sg[1]; /* MUST BE last item */
33 /* The tape buffer fragment descriptor */
34 struct st_buf_fragment {
39 /* The tape mode definition */
41 unsigned char defined;
42 unsigned char sysv; /* SYS V semantics? */
43 unsigned char do_async_writes;
44 unsigned char do_buffer_writes;
45 unsigned char do_read_ahead;
46 unsigned char defaults_for_writes;
47 unsigned char default_compression; /* 0 = don't touch, etc */
48 short default_density; /* Forced density, -1 = no value */
49 int default_blksize; /* Forced blocksize, -1 = no value */
50 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
53 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
54 number of modes is 16 (ST_NBR_MODE_BITS 4) */
55 #define ST_NBR_MODE_BITS 2
56 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
57 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
58 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
60 #define ST_MAX_TAPES 128
61 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
63 /* The status related to each partition */
68 unsigned char last_block_valid;
69 u32 last_block_visited;
70 int drv_block; /* The block where the drive head is */
74 #define ST_NBR_PARTITIONS 4
76 /* The tape drive descriptor */
78 struct scsi_driver *driver;
80 struct semaphore lock; /* For serialization */
81 struct completion wait; /* For SCSI commands */
84 /* Drive characteristics */
85 unsigned char omit_blklims;
86 unsigned char do_auto_lock;
87 unsigned char can_bsr;
88 unsigned char can_partitions;
90 unsigned char fast_mteom;
91 unsigned char immediate;
92 unsigned char restr_dma;
93 unsigned char scsi2_logical;
94 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
95 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
96 unsigned char cln_sense_value;
97 unsigned char cln_sense_mask;
98 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
99 unsigned char try_dio; /* try direct i/o? */
100 unsigned char c_algo; /* compression algorithm */
101 unsigned char pos_unknown; /* after reset position unknown */
103 int timeout; /* timeout for normal commands */
104 int long_timeout; /* timeout for commands known to take long time */
106 unsigned long max_pfn; /* the maximum page number reachable by the HBA */
108 /* Mode characteristics */
109 ST_mode modes[ST_NBR_MODES];
112 /* Status variables */
115 int nbr_partitions; /* zero until partition support enabled */
116 ST_partstat ps[ST_NBR_PARTITIONS];
119 unsigned char write_prot;
120 unsigned char drv_write_prot;
121 unsigned char in_use;
122 unsigned char blksize_changed;
123 unsigned char density_changed;
124 unsigned char compression_changed;
125 unsigned char drv_buffer;
126 unsigned char density;
127 unsigned char door_locked;
128 unsigned char autorew_dev; /* auto-rewind device */
129 unsigned char rew_at_close; /* rewind necessary at close */
130 unsigned char inited;
131 unsigned char cleaning_req; /* cleaning requested? */
135 int recover_count; /* From tape opening */
136 int recover_reg; /* From last status call */
139 unsigned char write_pending;
146 unsigned char last_cmnd[6];
147 unsigned char last_sense[16];
149 struct gendisk *disk;
152 /* Bit masks for use_pf */
161 #define ST_EOM_ERROR 4
165 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
166 return zero => ST_EOD, return ENOSPC */
167 /* When writing: ST_EOM_OK == early warning found, write OK
168 ST_EOD_1 == allow trying new write after early warning
169 ST_EOM_ERROR == early warning found, not able to write all */
176 /* Values of ready state */
178 #define ST_NOT_READY 1
181 /* Values for door lock state */
182 #define ST_UNLOCKED 0
183 #define ST_LOCKED_EXPLICIT 1
184 #define ST_LOCKED_AUTO 2
185 #define ST_LOCK_FAILS 3
187 /* Positioning SCSI-commands for Tandberg, etc. drives */
188 #define QFA_REQUEST_BLOCK 0x02
189 #define QFA_SEEK_BLOCK 0x0c
191 /* Setting the binary options */
192 #define ST_DONT_TOUCH 0
196 #define EXTENDED_SENSE_START 18