5 #include <linux/completion.h>
6 #include <linux/kref.h>
8 /* Descriptor for analyzed sense data */
11 struct scsi_sense_hdr sense_hdr;
20 /* The tape buffer descriptor. */
23 unsigned char dma; /* DMA-able buffer */
24 unsigned char do_dio; /* direct i/o set up? */
31 struct scsi_request *last_SRpnt;
32 struct st_cmdstatus cmdstat;
33 unsigned char *b_data;
34 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
35 unsigned short sg_segs; /* number of segments in s/g list */
36 unsigned short orig_frp_segs; /* number of segments allocated at first try */
37 unsigned short frp_segs; /* number of buffer segments */
38 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */
39 struct st_buf_fragment *frp; /* the allocated buffer fragment list */
40 struct scatterlist sg[1]; /* MUST BE last item */
43 /* The tape buffer fragment descriptor */
44 struct st_buf_fragment {
49 /* The tape mode definition */
51 unsigned char defined;
52 unsigned char sysv; /* SYS V semantics? */
53 unsigned char do_async_writes;
54 unsigned char do_buffer_writes;
55 unsigned char do_read_ahead;
56 unsigned char defaults_for_writes;
57 unsigned char default_compression; /* 0 = don't touch, etc */
58 short default_density; /* Forced density, -1 = no value */
59 int default_blksize; /* Forced blocksize, -1 = no value */
60 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
63 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
64 number of modes is 16 (ST_NBR_MODE_BITS 4) */
65 #define ST_NBR_MODE_BITS 2
66 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
67 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
68 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
70 #define ST_MAX_TAPES 128
71 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
73 /* The status related to each partition */
78 unsigned char last_block_valid;
79 u32 last_block_visited;
80 int drv_block; /* The block where the drive head is */
84 #define ST_NBR_PARTITIONS 4
86 /* The tape drive descriptor */
88 struct scsi_driver *driver;
89 struct scsi_device *device;
90 struct semaphore lock; /* For serialization */
91 struct completion wait; /* For SCSI commands */
92 struct st_buffer *buffer;
94 /* Drive characteristics */
95 unsigned char omit_blklims;
96 unsigned char do_auto_lock;
97 unsigned char can_bsr;
98 unsigned char can_partitions;
100 unsigned char fast_mteom;
101 unsigned char immediate;
102 unsigned char restr_dma;
103 unsigned char scsi2_logical;
104 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
105 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
106 unsigned char cln_sense_value;
107 unsigned char cln_sense_mask;
108 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
109 unsigned char try_dio; /* try direct i/o? */
110 unsigned char c_algo; /* compression algorithm */
111 unsigned char pos_unknown; /* after reset position unknown */
113 int long_timeout; /* timeout for commands known to take long time */
115 unsigned long max_pfn; /* the maximum page number reachable by the HBA */
117 /* Mode characteristics */
118 struct st_modedef modes[ST_NBR_MODES];
121 /* Status variables */
124 int nbr_partitions; /* zero until partition support enabled */
125 struct st_partstat ps[ST_NBR_PARTITIONS];
128 unsigned char write_prot;
129 unsigned char drv_write_prot;
130 unsigned char in_use;
131 unsigned char blksize_changed;
132 unsigned char density_changed;
133 unsigned char compression_changed;
134 unsigned char drv_buffer;
135 unsigned char density;
136 unsigned char door_locked;
137 unsigned char autorew_dev; /* auto-rewind device */
138 unsigned char rew_at_close; /* rewind necessary at close */
139 unsigned char inited;
140 unsigned char cleaning_req; /* cleaning requested? */
144 int recover_count; /* From tape opening */
145 int recover_reg; /* From last status call */
148 unsigned char write_pending;
155 unsigned char last_cmnd[6];
156 unsigned char last_sense[16];
158 struct gendisk *disk;
162 /* Bit masks for use_pf */
171 #define ST_EOM_ERROR 4
175 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
176 return zero => ST_EOD, return ENOSPC */
177 /* When writing: ST_EOM_OK == early warning found, write OK
178 ST_EOD_1 == allow trying new write after early warning
179 ST_EOM_ERROR == early warning found, not able to write all */
186 /* Values of ready state */
188 #define ST_NOT_READY 1
191 /* Values for door lock state */
192 #define ST_UNLOCKED 0
193 #define ST_LOCKED_EXPLICIT 1
194 #define ST_LOCKED_AUTO 2
195 #define ST_LOCK_FAILS 3
197 /* Positioning SCSI-commands for Tandberg, etc. drives */
198 #define QFA_REQUEST_BLOCK 0x02
199 #define QFA_SEEK_BLOCK 0x0c
201 /* Setting the binary options */
202 #define ST_DONT_TOUCH 0
206 #define EXTENDED_SENSE_START 18
208 /* Masks for some conditions in the sense data */
209 #define SENSE_FMK 0x80
210 #define SENSE_EOM 0x40
211 #define SENSE_ILI 0x20