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 in general? */
121 unsigned char try_dio_now; /* try direct i/o before next close? */
122 unsigned char c_algo; /* compression algorithm */
123 unsigned char pos_unknown; /* after reset position unknown */
125 int long_timeout; /* timeout for commands known to take long time */
127 unsigned long max_pfn; /* the maximum page number reachable by the HBA */
129 /* Mode characteristics */
130 struct st_modedef modes[ST_NBR_MODES];
133 /* Status variables */
136 int nbr_partitions; /* zero until partition support enabled */
137 struct st_partstat ps[ST_NBR_PARTITIONS];
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? */
156 int recover_count; /* From tape opening */
157 int recover_reg; /* From last status call */
160 unsigned char write_pending;
167 unsigned char last_cmnd[6];
168 unsigned char last_sense[16];
170 struct gendisk *disk;
174 /* Bit masks for use_pf */
183 #define ST_EOM_ERROR 4
187 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
188 return zero => ST_EOD, return ENOSPC */
189 /* When writing: ST_EOM_OK == early warning found, write OK
190 ST_EOD_1 == allow trying new write after early warning
191 ST_EOM_ERROR == early warning found, not able to write all */
198 /* Values of ready state */
200 #define ST_NOT_READY 1
203 /* Values for door lock state */
204 #define ST_UNLOCKED 0
205 #define ST_LOCKED_EXPLICIT 1
206 #define ST_LOCKED_AUTO 2
207 #define ST_LOCK_FAILS 3
209 /* Positioning SCSI-commands for Tandberg, etc. drives */
210 #define QFA_REQUEST_BLOCK 0x02
211 #define QFA_SEEK_BLOCK 0x0c
213 /* Setting the binary options */
214 #define ST_DONT_TOUCH 0
218 #define EXTENDED_SENSE_START 18
220 /* Masks for some conditions in the sense data */
221 #define SENSE_FMK 0x80
222 #define SENSE_EOM 0x40
223 #define SENSE_ILI 0x20