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 */ 11struct 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 23struct scsi_tape; 24 25/* scsi tape command */ 26struct 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. */ 36struct 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 */ 59struct 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 */ 83struct 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 */ 96struct 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 int tape_type; 124 int long_timeout; /* timeout for commands known to take long time */ 125 126 unsigned long max_pfn; /* the maximum page number reachable by the HBA */ 127 128 /* Mode characteristics */ 129 struct st_modedef modes[ST_NBR_MODES]; 130 int current_mode; 131 132 /* Status variables */ 133 int partition; 134 int new_partition; 135 int nbr_partitions; /* zero until partition support enabled */ 136 struct st_partstat ps[ST_NBR_PARTITIONS]; 137 unsigned char dirty; 138 unsigned char ready; 139 unsigned char write_prot; 140 unsigned char drv_write_prot; 141 unsigned char in_use; 142 unsigned char blksize_changed; 143 unsigned char density_changed; 144 unsigned char compression_changed; 145 unsigned char drv_buffer; 146 unsigned char density; 147 unsigned char door_locked; 148 unsigned char autorew_dev; /* auto-rewind device */ 149 unsigned char rew_at_close; /* rewind necessary at close */ 150 unsigned char inited; 151 unsigned char cleaning_req; /* cleaning requested? */ 152 int block_size; 153 int min_block; 154 int max_block; 155 int recover_count; /* From tape opening */ 156 int recover_reg; /* From last status call */ 157 158#if DEBUG 159 unsigned char write_pending; 160 int nbr_finished; 161 int nbr_waits; 162 int nbr_requests; 163 int nbr_dio; 164 int nbr_pages; 165 unsigned char last_cmnd[6]; 166 unsigned char last_sense[16]; 167#endif 168 struct gendisk *disk; 169 struct kref kref; 170}; 171 172/* Bit masks for use_pf */ 173#define USE_PF 1 174#define PF_TESTED 2 175 176/* Values of eof */ 177#define ST_NOEOF 0 178#define ST_FM_HIT 1 179#define ST_FM 2 180#define ST_EOM_OK 3 181#define ST_EOM_ERROR 4 182#define ST_EOD_1 5 183#define ST_EOD_2 6 184#define ST_EOD 7 185/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 186 return zero => ST_EOD, return ENOSPC */ 187/* When writing: ST_EOM_OK == early warning found, write OK 188 ST_EOD_1 == allow trying new write after early warning 189 ST_EOM_ERROR == early warning found, not able to write all */ 190 191/* Values of rw */ 192#define ST_IDLE 0 193#define ST_READING 1 194#define ST_WRITING 2 195 196/* Values of ready state */ 197#define ST_READY 0 198#define ST_NOT_READY 1 199#define ST_NO_TAPE 2 200 201/* Values for door lock state */ 202#define ST_UNLOCKED 0 203#define ST_LOCKED_EXPLICIT 1 204#define ST_LOCKED_AUTO 2 205#define ST_LOCK_FAILS 3 206 207/* Positioning SCSI-commands for Tandberg, etc. drives */ 208#define QFA_REQUEST_BLOCK 0x02 209#define QFA_SEEK_BLOCK 0x0c 210 211/* Setting the binary options */ 212#define ST_DONT_TOUCH 0 213#define ST_NO 1 214#define ST_YES 2 215 216#define EXTENDED_SENSE_START 18 217 218/* Masks for some conditions in the sense data */ 219#define SENSE_FMK 0x80 220#define SENSE_EOM 0x40 221#define SENSE_ILI 0x20 222 223#endif 224