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 page **mapped_pages;
50 struct rq_map_data map_data;
51 unsigned char *b_data;
52 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
53 unsigned short sg_segs; /* number of segments in s/g list */
54 unsigned short orig_frp_segs; /* number of segments allocated at first try */
55 unsigned short frp_segs; /* number of buffer segments */
56 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */
59 /* The tape mode definition */
61 unsigned char defined;
62 unsigned char sysv; /* SYS V semantics? */
63 unsigned char do_async_writes;
64 unsigned char do_buffer_writes;
65 unsigned char do_read_ahead;
66 unsigned char defaults_for_writes;
67 unsigned char default_compression; /* 0 = don't touch, etc */
68 short default_density; /* Forced density, -1 = no value */
69 int default_blksize; /* Forced blocksize, -1 = no value */
70 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
73 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
74 number of modes is 16 (ST_NBR_MODE_BITS 4) */
75 #define ST_NBR_MODE_BITS 2
76 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
77 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
78 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
80 #define ST_MAX_TAPES 128
81 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
83 /* The status related to each partition */
88 unsigned char last_block_valid;
89 u32 last_block_visited;
90 int drv_block; /* The block where the drive head is */
94 #define ST_NBR_PARTITIONS 4
96 /* The tape drive descriptor */
98 struct scsi_driver *driver;
99 struct scsi_device *device;
100 struct mutex lock; /* For serialization */
101 struct completion wait; /* For SCSI commands */
102 struct st_buffer *buffer;
104 /* Drive characteristics */
105 unsigned char omit_blklims;
106 unsigned char do_auto_lock;
107 unsigned char can_bsr;
108 unsigned char can_partitions;
109 unsigned char two_fm;
110 unsigned char fast_mteom;
111 unsigned char immediate;
112 unsigned char restr_dma;
113 unsigned char scsi2_logical;
114 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
115 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
116 unsigned char cln_sense_value;
117 unsigned char cln_sense_mask;
118 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
119 unsigned char try_dio; /* try direct i/o in general? */
120 unsigned char try_dio_now; /* try direct i/o before next close? */
121 unsigned char c_algo; /* compression algorithm */
122 unsigned char pos_unknown; /* after reset position unknown */
123 unsigned char sili; /* use SILI when reading in variable b mode */
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;
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