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 u64 uremainder64; 16 u8 flags; 17 u8 remainder_valid; 18 u8 fixed_format; 19 u8 deferred; 20}; 21 22struct scsi_tape; 23 24/* scsi tape command */ 25struct st_request { 26 unsigned char cmd[MAX_COMMAND_SIZE]; 27 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 28 int result; 29 struct scsi_tape *stp; 30 struct completion *waiting; 31}; 32 33/* The tape buffer descriptor. */ 34struct st_buffer { 35 unsigned char dma; /* DMA-able buffer */ 36 unsigned char do_dio; /* direct i/o set up? */ 37 int buffer_size; 38 int buffer_blocks; 39 int buffer_bytes; 40 int read_pointer; 41 int writing; 42 int syscall_result; 43 struct st_request *last_SRpnt; 44 struct st_cmdstatus cmdstat; 45 unsigned char *b_data; 46 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */ 47 unsigned short sg_segs; /* number of segments in s/g list */ 48 unsigned short orig_frp_segs; /* number of segments allocated at first try */ 49 unsigned short frp_segs; /* number of buffer segments */ 50 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */ 51 struct st_buf_fragment *frp; /* the allocated buffer fragment list */ 52 struct scatterlist sg[1]; /* MUST BE last item */ 53}; 54 55/* The tape buffer fragment descriptor */ 56struct st_buf_fragment { 57 struct page *page; 58 unsigned int length; 59}; 60 61/* The tape mode definition */ 62struct st_modedef { 63 unsigned char defined; 64 unsigned char sysv; /* SYS V semantics? */ 65 unsigned char do_async_writes; 66 unsigned char do_buffer_writes; 67 unsigned char do_read_ahead; 68 unsigned char defaults_for_writes; 69 unsigned char default_compression; /* 0 = don't touch, etc */ 70 short default_density; /* Forced density, -1 = no value */ 71 int default_blksize; /* Forced blocksize, -1 = no value */ 72 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ 73}; 74 75/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum 76 number of modes is 16 (ST_NBR_MODE_BITS 4) */ 77#define ST_NBR_MODE_BITS 2 78#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) 79#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) 80#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) 81 82#define ST_MAX_TAPES 128 83#define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) 84 85/* The status related to each partition */ 86struct st_partstat { 87 unsigned char rw; 88 unsigned char eof; 89 unsigned char at_sm; 90 unsigned char last_block_valid; 91 u32 last_block_visited; 92 int drv_block; /* The block where the drive head is */ 93 int drv_file; 94}; 95 96#define ST_NBR_PARTITIONS 4 97 98/* The tape drive descriptor */ 99struct scsi_tape { 100 struct scsi_driver *driver; 101 struct scsi_device *device; 102 struct mutex lock; /* For serialization */ 103 struct completion wait; /* For SCSI commands */ 104 struct st_buffer *buffer; 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 int tape_type; 126 int long_timeout; /* timeout for commands known to take long time */ 127 128 unsigned long max_pfn; /* the maximum page number reachable by the HBA */ 129 130 /* Mode characteristics */ 131 struct st_modedef modes[ST_NBR_MODES]; 132 int current_mode; 133 134 /* Status variables */ 135 int partition; 136 int new_partition; 137 int nbr_partitions; /* zero until partition support enabled */ 138 struct st_partstat ps[ST_NBR_PARTITIONS]; 139 unsigned char dirty; 140 unsigned char ready; 141 unsigned char write_prot; 142 unsigned char drv_write_prot; 143 unsigned char in_use; 144 unsigned char blksize_changed; 145 unsigned char density_changed; 146 unsigned char compression_changed; 147 unsigned char drv_buffer; 148 unsigned char density; 149 unsigned char door_locked; 150 unsigned char autorew_dev; /* auto-rewind device */ 151 unsigned char rew_at_close; /* rewind necessary at close */ 152 unsigned char inited; 153 unsigned char cleaning_req; /* cleaning requested? */ 154 int block_size; 155 int min_block; 156 int max_block; 157 int recover_count; /* From tape opening */ 158 int recover_reg; /* From last status call */ 159 160#if DEBUG 161 unsigned char write_pending; 162 int nbr_finished; 163 int nbr_waits; 164 int nbr_requests; 165 int nbr_dio; 166 int nbr_pages; 167 int nbr_combinable; 168 unsigned char last_cmnd[6]; 169 unsigned char last_sense[16]; 170#endif 171 struct gendisk *disk; 172 struct kref kref; 173}; 174 175/* Bit masks for use_pf */ 176#define USE_PF 1 177#define PF_TESTED 2 178 179/* Values of eof */ 180#define ST_NOEOF 0 181#define ST_FM_HIT 1 182#define ST_FM 2 183#define ST_EOM_OK 3 184#define ST_EOM_ERROR 4 185#define ST_EOD_1 5 186#define ST_EOD_2 6 187#define ST_EOD 7 188/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 189 return zero => ST_EOD, return ENOSPC */ 190/* When writing: ST_EOM_OK == early warning found, write OK 191 ST_EOD_1 == allow trying new write after early warning 192 ST_EOM_ERROR == early warning found, not able to write all */ 193 194/* Values of rw */ 195#define ST_IDLE 0 196#define ST_READING 1 197#define ST_WRITING 2 198 199/* Values of ready state */ 200#define ST_READY 0 201#define ST_NOT_READY 1 202#define ST_NO_TAPE 2 203 204/* Values for door lock state */ 205#define ST_UNLOCKED 0 206#define ST_LOCKED_EXPLICIT 1 207#define ST_LOCKED_AUTO 2 208#define ST_LOCK_FAILS 3 209 210/* Positioning SCSI-commands for Tandberg, etc. drives */ 211#define QFA_REQUEST_BLOCK 0x02 212#define QFA_SEEK_BLOCK 0x0c 213 214/* Setting the binary options */ 215#define ST_DONT_TOUCH 0 216#define ST_NO 1 217#define ST_YES 2 218 219#define EXTENDED_SENSE_START 18 220 221/* Masks for some conditions in the sense data */ 222#define SENSE_FMK 0x80 223#define SENSE_EOM 0x40 224#define SENSE_ILI 0x20 225 226#endif 227