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 cleared; /* internal buffer cleared after open? */ 39 unsigned short do_dio; /* direct i/o set up? */ 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 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 */ 72}; 73 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) 80 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)) 83 84/* The status related to each partition */ 85struct st_partstat { 86 unsigned char rw; 87 unsigned char eof; 88 unsigned char at_sm; 89 unsigned char last_block_valid; 90 u32 last_block_visited; 91 int drv_block; /* The block where the drive head is */ 92 int drv_file; 93}; 94 95#define ST_NBR_PARTITIONS 4 96 97/* The tape drive descriptor */ 98struct scsi_tape { 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; 104 int index; 105 106 /* 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 */ 127 int tape_type; 128 int long_timeout; /* timeout for commands known to take long time */ 129 130 unsigned long max_pfn; /* the maximum page number reachable by the HBA */ 131 132 /* Mode characteristics */ 133 struct st_modedef modes[ST_NBR_MODES]; 134 int current_mode; 135 136 /* Status variables */ 137 int partition; 138 int new_partition; 139 int nbr_partitions; /* zero until partition support enabled */ 140 struct st_partstat ps[ST_NBR_PARTITIONS]; 141 unsigned char dirty; 142 unsigned char ready; 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? */ 156 int block_size; 157 int min_block; 158 int max_block; 159 int recover_count; /* From tape opening */ 160 int recover_reg; /* From last status call */ 161 162#if DEBUG 163 unsigned char write_pending; 164 int nbr_finished; 165 int nbr_waits; 166 int nbr_requests; 167 int nbr_dio; 168 int nbr_pages; 169 unsigned char last_cmnd[6]; 170 unsigned char last_sense[16]; 171#endif 172 struct gendisk *disk; 173 struct kref kref; 174}; 175 176/* Bit masks for use_pf */ 177#define USE_PF 1 178#define PF_TESTED 2 179 180/* Values of eof */ 181#define ST_NOEOF 0 182#define ST_FM_HIT 1 183#define ST_FM 2 184#define ST_EOM_OK 3 185#define ST_EOM_ERROR 4 186#define ST_EOD_1 5 187#define ST_EOD_2 6 188#define ST_EOD 7 189/* 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 */ 194 195/* Values of rw */ 196#define ST_IDLE 0 197#define ST_READING 1 198#define ST_WRITING 2 199 200/* Values of ready state */ 201#define ST_READY 0 202#define ST_NOT_READY 1 203#define ST_NO_TAPE 2 204 205/* 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 3 210 211/* Positioning SCSI-commands for Tandberg, etc. drives */ 212#define QFA_REQUEST_BLOCK 0x02 213#define QFA_SEEK_BLOCK 0x0c 214 215/* Setting the binary options */ 216#define ST_DONT_TOUCH 0 217#define ST_NO 1 218#define ST_YES 2 219 220#define EXTENDED_SENSE_START 18 221 222/* Masks for some conditions in the sense data */ 223#define SENSE_FMK 0x80 224#define SENSE_EOM 0x40 225#define SENSE_ILI 0x20 226 227#endif 228