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 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 frp_segs; /* number of buffer segments */ 55}; 56 57/* The tape mode definition */ 58struct st_modedef { 59 unsigned char defined; 60 unsigned char sysv; /* SYS V semantics? */ 61 unsigned char do_async_writes; 62 unsigned char do_buffer_writes; 63 unsigned char do_read_ahead; 64 unsigned char defaults_for_writes; 65 unsigned char default_compression; /* 0 = don't touch, etc */ 66 short default_density; /* Forced density, -1 = no value */ 67 int default_blksize; /* Forced blocksize, -1 = no value */ 68 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ 69}; 70 71/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum 72 number of modes is 16 (ST_NBR_MODE_BITS 4) */ 73#define ST_NBR_MODE_BITS 2 74#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) 75#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) 76#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) 77 78#define ST_MAX_TAPES 128 79#define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) 80 81/* The status related to each partition */ 82struct st_partstat { 83 unsigned char rw; 84 unsigned char eof; 85 unsigned char at_sm; 86 unsigned char last_block_valid; 87 u32 last_block_visited; 88 int drv_block; /* The block where the drive head is */ 89 int drv_file; 90}; 91 92#define ST_NBR_PARTITIONS 4 93 94/* The tape drive descriptor */ 95struct scsi_tape { 96 struct scsi_driver *driver; 97 struct scsi_device *device; 98 struct mutex lock; /* For serialization */ 99 struct completion wait; /* For SCSI commands */ 100 struct st_buffer *buffer; 101 102 /* Drive characteristics */ 103 unsigned char omit_blklims; 104 unsigned char do_auto_lock; 105 unsigned char can_bsr; 106 unsigned char can_partitions; 107 unsigned char two_fm; 108 unsigned char fast_mteom; 109 unsigned char immediate; 110 unsigned char restr_dma; 111 unsigned char scsi2_logical; 112 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ 113 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ 114 unsigned char cln_sense_value; 115 unsigned char cln_sense_mask; 116 unsigned char use_pf; /* Set Page Format bit in all mode selects? */ 117 unsigned char try_dio; /* try direct i/o in general? */ 118 unsigned char try_dio_now; /* try direct i/o before next close? */ 119 unsigned char c_algo; /* compression algorithm */ 120 unsigned char pos_unknown; /* after reset position unknown */ 121 unsigned char sili; /* use SILI when reading in variable b mode */ 122 int tape_type; 123 int long_timeout; /* timeout for commands known to take long time */ 124 125 unsigned long max_pfn; /* the maximum page number reachable by the HBA */ 126 127 /* Mode characteristics */ 128 struct st_modedef modes[ST_NBR_MODES]; 129 int current_mode; 130 131 /* Status variables */ 132 int partition; 133 int new_partition; 134 int nbr_partitions; /* zero until partition support enabled */ 135 struct st_partstat ps[ST_NBR_PARTITIONS]; 136 unsigned char dirty; 137 unsigned char ready; 138 unsigned char write_prot; 139 unsigned char drv_write_prot; 140 unsigned char in_use; 141 unsigned char blksize_changed; 142 unsigned char density_changed; 143 unsigned char compression_changed; 144 unsigned char drv_buffer; 145 unsigned char density; 146 unsigned char door_locked; 147 unsigned char autorew_dev; /* auto-rewind device */ 148 unsigned char rew_at_close; /* rewind necessary at close */ 149 unsigned char inited; 150 unsigned char cleaning_req; /* cleaning requested? */ 151 int block_size; 152 int min_block; 153 int max_block; 154 int recover_count; /* From tape opening */ 155 int recover_reg; /* From last status call */ 156 157#if DEBUG 158 unsigned char write_pending; 159 int nbr_finished; 160 int nbr_waits; 161 int nbr_requests; 162 int nbr_dio; 163 int nbr_pages; 164 unsigned char last_cmnd[6]; 165 unsigned char last_sense[16]; 166#endif 167 struct gendisk *disk; 168 struct kref kref; 169}; 170 171/* Bit masks for use_pf */ 172#define USE_PF 1 173#define PF_TESTED 2 174 175/* Values of eof */ 176#define ST_NOEOF 0 177#define ST_FM_HIT 1 178#define ST_FM 2 179#define ST_EOM_OK 3 180#define ST_EOM_ERROR 4 181#define ST_EOD_1 5 182#define ST_EOD_2 6 183#define ST_EOD 7 184/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 185 return zero => ST_EOD, return ENOSPC */ 186/* When writing: ST_EOM_OK == early warning found, write OK 187 ST_EOD_1 == allow trying new write after early warning 188 ST_EOM_ERROR == early warning found, not able to write all */ 189 190/* Values of rw */ 191#define ST_IDLE 0 192#define ST_READING 1 193#define ST_WRITING 2 194 195/* Values of ready state */ 196#define ST_READY 0 197#define ST_NOT_READY 1 198#define ST_NO_TAPE 2 199 200/* Values for door lock state */ 201#define ST_UNLOCKED 0 202#define ST_LOCKED_EXPLICIT 1 203#define ST_LOCKED_AUTO 2 204#define ST_LOCK_FAILS 3 205 206/* Positioning SCSI-commands for Tandberg, etc. drives */ 207#define QFA_REQUEST_BLOCK 0x02 208#define QFA_SEEK_BLOCK 0x0c 209 210/* Setting the binary options */ 211#define ST_DONT_TOUCH 0 212#define ST_NO 1 213#define ST_YES 2 214 215#define EXTENDED_SENSE_START 18 216 217/* Masks for some conditions in the sense data */ 218#define SENSE_FMK 0x80 219#define SENSE_EOM 0x40 220#define SENSE_ILI 0x20 221 222#endif 223