5 #include <linux/completion.h>
6 #include <linux/kref.h>
7 #include <scsi/scsi_cmnd.h>
9 /* Descriptor for analyzed sense data */
12 struct scsi_sense_hdr sense_hdr
;
23 /* scsi tape command */
25 unsigned char cmd
[MAX_COMMAND_SIZE
];
26 unsigned char sense
[SCSI_SENSE_BUFFERSIZE
];
28 struct scsi_tape
*stp
;
29 struct completion
*waiting
;
32 /* The tape buffer descriptor. */
34 unsigned char dma
; /* DMA-able buffer */
35 unsigned char do_dio
; /* direct i/o set up? */
42 struct st_request
*last_SRpnt
;
43 struct st_cmdstatus cmdstat
;
44 unsigned char *b_data
;
45 unsigned short use_sg
; /* zero or max number of s/g segments for this adapter */
46 unsigned short sg_segs
; /* number of segments in s/g list */
47 unsigned short orig_frp_segs
; /* number of segments allocated at first try */
48 unsigned short frp_segs
; /* number of buffer segments */
49 unsigned int frp_sg_current
; /* driver buffer length currently in s/g list */
50 struct st_buf_fragment
*frp
; /* the allocated buffer fragment list */
51 struct scatterlist sg
[1]; /* MUST BE last item */
54 /* The tape buffer fragment descriptor */
55 struct st_buf_fragment
{
60 /* The tape mode definition */
62 unsigned char defined
;
63 unsigned char sysv
; /* SYS V semantics? */
64 unsigned char do_async_writes
;
65 unsigned char do_buffer_writes
;
66 unsigned char do_read_ahead
;
67 unsigned char defaults_for_writes
;
68 unsigned char default_compression
; /* 0 = don't touch, etc */
69 short default_density
; /* Forced density, -1 = no value */
70 int default_blksize
; /* Forced blocksize, -1 = no value */
71 struct cdev
*cdevs
[2]; /* Auto-rewind and non-rewind devices */
74 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
75 number of modes is 16 (ST_NBR_MODE_BITS 4) */
76 #define ST_NBR_MODE_BITS 2
77 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
78 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
79 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
81 #define ST_MAX_TAPES 128
82 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
84 /* The status related to each partition */
89 unsigned char last_block_valid
;
90 u32 last_block_visited
;
91 int drv_block
; /* The block where the drive head is */
95 #define ST_NBR_PARTITIONS 4
97 /* The tape drive descriptor */
99 struct scsi_driver
*driver
;
100 struct scsi_device
*device
;
101 struct semaphore lock
; /* For serialization */
102 struct completion wait
; /* For SCSI commands */
103 struct st_buffer
*buffer
;
105 /* Drive characteristics */
106 unsigned char omit_blklims
;
107 unsigned char do_auto_lock
;
108 unsigned char can_bsr
;
109 unsigned char can_partitions
;
110 unsigned char two_fm
;
111 unsigned char fast_mteom
;
112 unsigned char immediate
;
113 unsigned char restr_dma
;
114 unsigned char scsi2_logical
;
115 unsigned char default_drvbuffer
; /* 0xff = don't touch, value 3 bits */
116 unsigned char cln_mode
; /* 0 = none, otherwise sense byte nbr */
117 unsigned char cln_sense_value
;
118 unsigned char cln_sense_mask
;
119 unsigned char use_pf
; /* Set Page Format bit in all mode selects? */
120 unsigned char try_dio
; /* try direct i/o? */
121 unsigned char c_algo
; /* compression algorithm */
122 unsigned char pos_unknown
; /* after reset position unknown */
124 int long_timeout
; /* timeout for commands known to take long time */
126 unsigned long max_pfn
; /* the maximum page number reachable by the HBA */
128 /* Mode characteristics */
129 struct st_modedef modes
[ST_NBR_MODES
];
132 /* Status variables */
135 int nbr_partitions
; /* zero until partition support enabled */
136 struct st_partstat ps
[ST_NBR_PARTITIONS
];
139 unsigned char write_prot
;
140 unsigned char drv_write_prot
;
141 unsigned char in_use
;
142 unsigned char blksize_changed
;
143 unsigned char density_changed
;
144 unsigned char compression_changed
;
145 unsigned char drv_buffer
;
146 unsigned char density
;
147 unsigned char door_locked
;
148 unsigned char autorew_dev
; /* auto-rewind device */
149 unsigned char rew_at_close
; /* rewind necessary at close */
150 unsigned char inited
;
151 unsigned char cleaning_req
; /* cleaning requested? */
155 int recover_count
; /* From tape opening */
156 int recover_reg
; /* From last status call */
159 unsigned char write_pending
;
166 unsigned char last_cmnd
[6];
167 unsigned char last_sense
[16];
169 struct gendisk
*disk
;
173 /* Bit masks for use_pf */
182 #define ST_EOM_ERROR 4
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 */
197 /* Values of ready state */
199 #define ST_NOT_READY 1
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
208 /* Positioning SCSI-commands for Tandberg, etc. drives */
209 #define QFA_REQUEST_BLOCK 0x02
210 #define QFA_SEEK_BLOCK 0x0c
212 /* Setting the binary options */
213 #define ST_DONT_TOUCH 0
217 #define EXTENDED_SENSE_START 18
219 /* Masks for some conditions in the sense data */
220 #define SENSE_FMK 0x80
221 #define SENSE_EOM 0x40
222 #define SENSE_ILI 0x20