5 #include <linux/completion.h>
6 #include <linux/mutex.h>
7 #include <linux/kref.h>
8 #include <scsi/scsi_cmnd.h>
10 /* Descriptor for analyzed sense data */
13 struct scsi_sense_hdr sense_hdr;
25 /* scsi tape command */
27 unsigned char cmd[MAX_COMMAND_SIZE];
28 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
30 struct scsi_tape *stp;
31 struct completion *waiting;
35 /* The tape buffer descriptor. */
37 unsigned char dma; /* DMA-able buffer */
38 unsigned char do_dio; /* direct i/o set up? */
39 unsigned char cleared; /* internal buffer cleared after open? */
46 struct st_request *last_SRpnt;
47 struct st_cmdstatus cmdstat;
48 struct page **reserved_pages;
49 struct rq_map_data map_data;
50 unsigned char *b_data;
51 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
52 unsigned short sg_segs; /* number of segments in s/g list */
53 unsigned short orig_frp_segs; /* number of segments allocated at first try */
54 unsigned short frp_segs; /* number of buffer segments */
55 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */
56 struct st_buf_fragment *frp; /* the allocated buffer fragment list */
57 struct scatterlist sg[1]; /* MUST BE last item */
60 /* The tape buffer fragment descriptor */
61 struct st_buf_fragment {
66 /* The tape mode definition */
68 unsigned char defined;
69 unsigned char sysv; /* SYS V semantics? */
70 unsigned char do_async_writes;
71 unsigned char do_buffer_writes;
72 unsigned char do_read_ahead;
73 unsigned char defaults_for_writes;
74 unsigned char default_compression; /* 0 = don't touch, etc */
75 short default_density; /* Forced density, -1 = no value */
76 int default_blksize; /* Forced blocksize, -1 = no value */
77 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
80 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
81 number of modes is 16 (ST_NBR_MODE_BITS 4) */
82 #define ST_NBR_MODE_BITS 2
83 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
84 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
85 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
87 #define ST_MAX_TAPES 128
88 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
90 /* The status related to each partition */
95 unsigned char last_block_valid;
96 u32 last_block_visited;
97 int drv_block; /* The block where the drive head is */
101 #define ST_NBR_PARTITIONS 4
103 /* The tape drive descriptor */
105 struct scsi_driver *driver;
106 struct scsi_device *device;
107 struct mutex lock; /* For serialization */
108 struct completion wait; /* For SCSI commands */
109 struct st_buffer *buffer;
111 /* Drive characteristics */
112 unsigned char omit_blklims;
113 unsigned char do_auto_lock;
114 unsigned char can_bsr;
115 unsigned char can_partitions;
116 unsigned char two_fm;
117 unsigned char fast_mteom;
118 unsigned char immediate;
119 unsigned char restr_dma;
120 unsigned char scsi2_logical;
121 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
122 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
123 unsigned char cln_sense_value;
124 unsigned char cln_sense_mask;
125 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
126 unsigned char try_dio; /* try direct i/o in general? */
127 unsigned char try_dio_now; /* try direct i/o before next close? */
128 unsigned char c_algo; /* compression algorithm */
129 unsigned char pos_unknown; /* after reset position unknown */
130 unsigned char sili; /* use SILI when reading in variable b mode */
132 int long_timeout; /* timeout for commands known to take long time */
134 unsigned long max_pfn; /* the maximum page number reachable by the HBA */
136 /* Mode characteristics */
137 struct st_modedef modes[ST_NBR_MODES];
140 /* Status variables */
143 int nbr_partitions; /* zero until partition support enabled */
144 struct st_partstat ps[ST_NBR_PARTITIONS];
147 unsigned char write_prot;
148 unsigned char drv_write_prot;
149 unsigned char in_use;
150 unsigned char blksize_changed;
151 unsigned char density_changed;
152 unsigned char compression_changed;
153 unsigned char drv_buffer;
154 unsigned char density;
155 unsigned char door_locked;
156 unsigned char autorew_dev; /* auto-rewind device */
157 unsigned char rew_at_close; /* rewind necessary at close */
158 unsigned char inited;
159 unsigned char cleaning_req; /* cleaning requested? */
163 int recover_count; /* From tape opening */
164 int recover_reg; /* From last status call */
167 unsigned char write_pending;
173 unsigned char last_cmnd[6];
174 unsigned char last_sense[16];
176 struct gendisk *disk;
180 /* Bit masks for use_pf */
189 #define ST_EOM_ERROR 4
193 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
194 return zero => ST_EOD, return ENOSPC */
195 /* When writing: ST_EOM_OK == early warning found, write OK
196 ST_EOD_1 == allow trying new write after early warning
197 ST_EOM_ERROR == early warning found, not able to write all */
204 /* Values of ready state */
206 #define ST_NOT_READY 1
209 /* Values for door lock state */
210 #define ST_UNLOCKED 0
211 #define ST_LOCKED_EXPLICIT 1
212 #define ST_LOCKED_AUTO 2
213 #define ST_LOCK_FAILS 3
215 /* Positioning SCSI-commands for Tandberg, etc. drives */
216 #define QFA_REQUEST_BLOCK 0x02
217 #define QFA_SEEK_BLOCK 0x0c
219 /* Setting the binary options */
220 #define ST_DONT_TOUCH 0
224 #define EXTENDED_SENSE_START 18
226 /* Masks for some conditions in the sense data */
227 #define SENSE_FMK 0x80
228 #define SENSE_EOM 0x40
229 #define SENSE_ILI 0x20