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 cleared; /* internal buffer cleared after open? */
39 unsigned short do_dio; /* direct i/o set up? */
46 struct st_request *last_SRpnt;
47 struct st_cmdstatus cmdstat;
48 struct page **reserved_pages;
49 int reserved_page_order;
50 struct page **mapped_pages;
51 struct rq_map_data map_data;
52 unsigned char *b_data;
53 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
54 unsigned short sg_segs; /* number of segments in s/g list */
55 unsigned short frp_segs; /* number of buffer segments */
58 /* The tape mode definition */
60 unsigned char defined;
61 unsigned char sysv; /* SYS V semantics? */
62 unsigned char do_async_writes;
63 unsigned char do_buffer_writes;
64 unsigned char do_read_ahead;
65 unsigned char defaults_for_writes;
66 unsigned char default_compression; /* 0 = don't touch, etc */
67 short default_density; /* Forced density, -1 = no value */
68 int default_blksize; /* Forced blocksize, -1 = no value */
69 struct scsi_tape *tape;
70 struct device *devs[2]; /* Auto-rewind and non-rewind devices */
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 (1 << (20 - (ST_NBR_MODE_BITS + 1)))
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 mutex lock; /* For serialization */
102 struct completion wait; /* For SCSI commands */
103 struct st_buffer *buffer;
106 /* Drive characteristics */
107 unsigned char omit_blklims;
108 unsigned char do_auto_lock;
109 unsigned char can_bsr;
110 unsigned char can_partitions;
111 unsigned char two_fm;
112 unsigned char fast_mteom;
113 unsigned char immediate;
114 unsigned char restr_dma;
115 unsigned char scsi2_logical;
116 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
117 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
118 unsigned char cln_sense_value;
119 unsigned char cln_sense_mask;
120 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
121 unsigned char try_dio; /* try direct i/o in general? */
122 unsigned char try_dio_now; /* try direct i/o before next close? */
123 unsigned char c_algo; /* compression algorithm */
124 unsigned char pos_unknown; /* after reset position unknown */
125 unsigned char sili; /* use SILI when reading in variable b mode */
126 unsigned char immediate_filemark; /* write filemark immediately */
128 int long_timeout; /* timeout for commands known to take long time */
130 unsigned long max_pfn; /* the maximum page number reachable by the HBA */
132 /* Mode characteristics */
133 struct st_modedef modes[ST_NBR_MODES];
136 /* Status variables */
139 int nbr_partitions; /* zero until partition support enabled */
140 struct st_partstat ps[ST_NBR_PARTITIONS];
143 unsigned char write_prot;
144 unsigned char drv_write_prot;
145 unsigned char in_use;
146 unsigned char blksize_changed;
147 unsigned char density_changed;
148 unsigned char compression_changed;
149 unsigned char drv_buffer;
150 unsigned char density;
151 unsigned char door_locked;
152 unsigned char autorew_dev; /* auto-rewind device */
153 unsigned char rew_at_close; /* rewind necessary at close */
154 unsigned char inited;
155 unsigned char cleaning_req; /* cleaning requested? */
159 int recover_count; /* From tape opening */
160 int recover_reg; /* From last status call */
163 unsigned char write_pending;
169 unsigned char last_cmnd[6];
170 unsigned char last_sense[16];
172 struct gendisk *disk;
176 /* Bit masks for use_pf */
185 #define ST_EOM_ERROR 4
189 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
190 return zero => ST_EOD, return ENOSPC */
191 /* When writing: ST_EOM_OK == early warning found, write OK
192 ST_EOD_1 == allow trying new write after early warning
193 ST_EOM_ERROR == early warning found, not able to write all */
200 /* Values of ready state */
202 #define ST_NOT_READY 1
205 /* Values for door lock state */
206 #define ST_UNLOCKED 0
207 #define ST_LOCKED_EXPLICIT 1
208 #define ST_LOCKED_AUTO 2
209 #define ST_LOCK_FAILS 3
211 /* Positioning SCSI-commands for Tandberg, etc. drives */
212 #define QFA_REQUEST_BLOCK 0x02
213 #define QFA_SEEK_BLOCK 0x0c
215 /* Setting the binary options */
216 #define ST_DONT_TOUCH 0
220 #define EXTENDED_SENSE_START 18
222 /* Masks for some conditions in the sense data */
223 #define SENSE_FMK 0x80
224 #define SENSE_EOM 0x40
225 #define SENSE_ILI 0x20