1 2 #ifndef _ST_H 3 #define _ST_H 4 5 #include <linux/completion.h> 6 #include <linux/mutex.h> 7 #include <linux/kref.h> 8 #include <scsi/scsi_cmnd.h> 9 10 /* Descriptor for analyzed sense data */ 11 struct st_cmdstatus { 12 int midlevel_result; 13 struct scsi_sense_hdr sense_hdr; 14 int have_sense; 15 int residual; 16 u64 uremainder64; 17 u8 flags; 18 u8 remainder_valid; 19 u8 fixed_format; 20 u8 deferred; 21 }; 22 23 struct scsi_tape; 24 25 /* scsi tape command */ 26 struct st_request { 27 unsigned char cmd[MAX_COMMAND_SIZE]; 28 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 29 int result; 30 struct scsi_tape *stp; 31 struct completion *waiting; 32 struct bio *bio; 33 }; 34 35 /* The tape buffer descriptor. */ 36 struct st_buffer { 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? */ 40 int buffer_size; 41 int buffer_blocks; 42 int buffer_bytes; 43 int read_pointer; 44 int writing; 45 int syscall_result; 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 */ 56 }; 57 58 /* The tape mode definition */ 59 struct st_modedef { 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 cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ 70 }; 71 72 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum 73 number of modes is 16 (ST_NBR_MODE_BITS 4) */ 74 #define ST_NBR_MODE_BITS 2 75 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) 76 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) 77 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) 78 79 #define ST_MAX_TAPES 128 80 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) 81 82 /* The status related to each partition */ 83 struct st_partstat { 84 unsigned char rw; 85 unsigned char eof; 86 unsigned char at_sm; 87 unsigned char last_block_valid; 88 u32 last_block_visited; 89 int drv_block; /* The block where the drive head is */ 90 int drv_file; 91 }; 92 93 #define ST_NBR_PARTITIONS 4 94 95 /* The tape drive descriptor */ 96 struct scsi_tape { 97 struct scsi_driver *driver; 98 struct scsi_device *device; 99 struct mutex lock; /* For serialization */ 100 struct completion wait; /* For SCSI commands */ 101 struct st_buffer *buffer; 102 103 /* Drive characteristics */ 104 unsigned char omit_blklims; 105 unsigned char do_auto_lock; 106 unsigned char can_bsr; 107 unsigned char can_partitions; 108 unsigned char two_fm; 109 unsigned char fast_mteom; 110 unsigned char immediate; 111 unsigned char restr_dma; 112 unsigned char scsi2_logical; 113 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ 114 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ 115 unsigned char cln_sense_value; 116 unsigned char cln_sense_mask; 117 unsigned char use_pf; /* Set Page Format bit in all mode selects? */ 118 unsigned char try_dio; /* try direct i/o in general? */ 119 unsigned char try_dio_now; /* try direct i/o before next close? */ 120 unsigned char c_algo; /* compression algorithm */ 121 unsigned char pos_unknown; /* after reset position unknown */ 122 unsigned char sili; /* use SILI when reading in variable b mode */ 123 unsigned char immediate_filemark; /* write filemark immediately */ 124 int tape_type; 125 int long_timeout; /* timeout for commands known to take long time */ 126 127 unsigned long max_pfn; /* the maximum page number reachable by the HBA */ 128 129 /* Mode characteristics */ 130 struct st_modedef modes[ST_NBR_MODES]; 131 int current_mode; 132 133 /* Status variables */ 134 int partition; 135 int new_partition; 136 int nbr_partitions; /* zero until partition support enabled */ 137 struct st_partstat ps[ST_NBR_PARTITIONS]; 138 unsigned char dirty; 139 unsigned char ready; 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? */ 153 int block_size; 154 int min_block; 155 int max_block; 156 int recover_count; /* From tape opening */ 157 int recover_reg; /* From last status call */ 158 159 #if DEBUG 160 unsigned char write_pending; 161 int nbr_finished; 162 int nbr_waits; 163 int nbr_requests; 164 int nbr_dio; 165 int nbr_pages; 166 unsigned char last_cmnd[6]; 167 unsigned char last_sense[16]; 168 #endif 169 struct gendisk *disk; 170 struct kref kref; 171 }; 172 173 /* Bit masks for use_pf */ 174 #define USE_PF 1 175 #define PF_TESTED 2 176 177 /* Values of eof */ 178 #define ST_NOEOF 0 179 #define ST_FM_HIT 1 180 #define ST_FM 2 181 #define ST_EOM_OK 3 182 #define ST_EOM_ERROR 4 183 #define ST_EOD_1 5 184 #define ST_EOD_2 6 185 #define ST_EOD 7 186 /* 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 */ 191 192 /* Values of rw */ 193 #define ST_IDLE 0 194 #define ST_READING 1 195 #define ST_WRITING 2 196 197 /* Values of ready state */ 198 #define ST_READY 0 199 #define ST_NOT_READY 1 200 #define ST_NO_TAPE 2 201 202 /* 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 3 207 208 /* Positioning SCSI-commands for Tandberg, etc. drives */ 209 #define QFA_REQUEST_BLOCK 0x02 210 #define QFA_SEEK_BLOCK 0x0c 211 212 /* Setting the binary options */ 213 #define ST_DONT_TOUCH 0 214 #define ST_NO 1 215 #define ST_YES 2 216 217 #define EXTENDED_SENSE_START 18 218 219 /* Masks for some conditions in the sense data */ 220 #define SENSE_FMK 0x80 221 #define SENSE_EOM 0x40 222 #define SENSE_ILI 0x20 223 224 #endif 225