1 2#ifndef _ST_H 3#define _ST_H 4 5#include <linux/completion.h> 6#include <linux/kref.h> 7#include <scsi/scsi_cmnd.h> 8 9/* Descriptor for analyzed sense data */ 10struct st_cmdstatus { 11 int midlevel_result; 12 struct scsi_sense_hdr sense_hdr; 13 int have_sense; 14 u64 uremainder64; 15 u8 flags; 16 u8 remainder_valid; 17 u8 fixed_format; 18 u8 deferred; 19}; 20 21struct scsi_tape; 22 23/* scsi tape command */ 24struct st_request { 25 unsigned char cmd[MAX_COMMAND_SIZE]; 26 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 27 int result; 28 struct scsi_tape *stp; 29 struct completion *waiting; 30}; 31 32/* The tape buffer descriptor. */ 33struct st_buffer { 34 unsigned char dma; /* DMA-able buffer */ 35 unsigned char do_dio; /* direct i/o set up? */ 36 int buffer_size; 37 int buffer_blocks; 38 int buffer_bytes; 39 int read_pointer; 40 int writing; 41 int syscall_result; 42 struct st_request *last_SRpnt; 43 struct st_cmdstatus cmdstat; 44 unsigned char *b_data; 45 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */ 46 unsigned short sg_segs; /* number of segments in s/g list */ 47 unsigned short orig_frp_segs; /* number of segments allocated at first try */ 48 unsigned short frp_segs; /* number of buffer segments */ 49 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */ 50 struct st_buf_fragment *frp; /* the allocated buffer fragment list */ 51 struct scatterlist sg[1]; /* MUST BE last item */ 52}; 53 54/* The tape buffer fragment descriptor */ 55struct st_buf_fragment { 56 struct page *page; 57 unsigned int length; 58}; 59 60/* The tape mode definition */ 61struct st_modedef { 62 unsigned char defined; 63 unsigned char sysv; /* SYS V semantics? */ 64 unsigned char do_async_writes; 65 unsigned char do_buffer_writes; 66 unsigned char do_read_ahead; 67 unsigned char defaults_for_writes; 68 unsigned char default_compression; /* 0 = don't touch, etc */ 69 short default_density; /* Forced density, -1 = no value */ 70 int default_blksize; /* Forced blocksize, -1 = no value */ 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 128 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 semaphore lock; /* For serialization */ 102 struct completion wait; /* For SCSI commands */ 103 struct st_buffer *buffer; 104 105 /* Drive characteristics */ 106 unsigned char omit_blklims; 107 unsigned char do_auto_lock; 108 unsigned char can_bsr; 109 unsigned char can_partitions; 110 unsigned char two_fm; 111 unsigned char fast_mteom; 112 unsigned char immediate; 113 unsigned char restr_dma; 114 unsigned char scsi2_logical; 115 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ 116 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ 117 unsigned char cln_sense_value; 118 unsigned char cln_sense_mask; 119 unsigned char use_pf; /* Set Page Format bit in all mode selects? */ 120 unsigned char try_dio; /* try direct i/o in general? */ 121 unsigned char try_dio_now; /* try direct i/o before next close? */ 122 unsigned char c_algo; /* compression algorithm */ 123 unsigned char pos_unknown; /* after reset position unknown */ 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 int nbr_combinable; 167 unsigned char last_cmnd[6]; 168 unsigned char last_sense[16]; 169#endif 170 struct gendisk *disk; 171 struct kref kref; 172}; 173 174/* Bit masks for use_pf */ 175#define USE_PF 1 176#define PF_TESTED 2 177 178/* Values of eof */ 179#define ST_NOEOF 0 180#define ST_FM_HIT 1 181#define ST_FM 2 182#define ST_EOM_OK 3 183#define ST_EOM_ERROR 4 184#define ST_EOD_1 5 185#define ST_EOD_2 6 186#define ST_EOD 7 187/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 188 return zero => ST_EOD, return ENOSPC */ 189/* When writing: ST_EOM_OK == early warning found, write OK 190 ST_EOD_1 == allow trying new write after early warning 191 ST_EOM_ERROR == early warning found, not able to write all */ 192 193/* Values of rw */ 194#define ST_IDLE 0 195#define ST_READING 1 196#define ST_WRITING 2 197 198/* Values of ready state */ 199#define ST_READY 0 200#define ST_NOT_READY 1 201#define ST_NO_TAPE 2 202 203/* Values for door lock state */ 204#define ST_UNLOCKED 0 205#define ST_LOCKED_EXPLICIT 1 206#define ST_LOCKED_AUTO 2 207#define ST_LOCK_FAILS 3 208 209/* Positioning SCSI-commands for Tandberg, etc. drives */ 210#define QFA_REQUEST_BLOCK 0x02 211#define QFA_SEEK_BLOCK 0x0c 212 213/* Setting the binary options */ 214#define ST_DONT_TOUCH 0 215#define ST_NO 1 216#define ST_YES 2 217 218#define EXTENDED_SENSE_START 18 219 220/* Masks for some conditions in the sense data */ 221#define SENSE_FMK 0x80 222#define SENSE_EOM 0x40 223#define SENSE_ILI 0x20 224 225#endif 226