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