1 2#ifndef _ST_H 3#define _ST_H 4 5#include <linux/completion.h> 6 7 8/* The tape buffer descriptor. */ 9struct st_buffer { 10 unsigned char in_use; 11 unsigned char dma; /* DMA-able buffer */ 12 unsigned char do_dio; /* direct i/o set up? */ 13 int buffer_size; 14 int buffer_blocks; 15 int buffer_bytes; 16 int read_pointer; 17 int writing; 18 int midlevel_result; 19 int syscall_result; 20 struct scsi_request *last_SRpnt; 21 unsigned char *b_data; 22 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */ 23 unsigned short sg_segs; /* number of segments in s/g list */ 24 unsigned short orig_frp_segs; /* number of segments allocated at first try */ 25 unsigned short frp_segs; /* number of buffer segments */ 26 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */ 27 struct st_buf_fragment *frp; /* the allocated buffer fragment list */ 28 struct scatterlist sg[1]; /* MUST BE last item */ 29}; 30 31/* The tape buffer fragment descriptor */ 32struct st_buf_fragment { 33 struct page *page; 34 unsigned int length; 35}; 36 37/* The tape mode definition */ 38struct st_modedef { 39 unsigned char defined; 40 unsigned char sysv; /* SYS V semantics? */ 41 unsigned char do_async_writes; 42 unsigned char do_buffer_writes; 43 unsigned char do_read_ahead; 44 unsigned char defaults_for_writes; 45 unsigned char default_compression; /* 0 = don't touch, etc */ 46 short default_density; /* Forced density, -1 = no value */ 47 int default_blksize; /* Forced blocksize, -1 = no value */ 48 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ 49}; 50 51/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum 52 number of modes is 16 (ST_NBR_MODE_BITS 4) */ 53#define ST_NBR_MODE_BITS 2 54#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) 55#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) 56#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) 57 58#define ST_MAX_TAPES 128 59#define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) 60 61/* The status related to each partition */ 62struct st_partstat { 63 unsigned char rw; 64 unsigned char eof; 65 unsigned char at_sm; 66 unsigned char last_block_valid; 67 u32 last_block_visited; 68 int drv_block; /* The block where the drive head is */ 69 int drv_file; 70}; 71 72#define ST_NBR_PARTITIONS 4 73 74/* The tape drive descriptor */ 75struct scsi_tape { 76 struct scsi_driver *driver; 77 struct scsi_device *device; 78 struct semaphore lock; /* For serialization */ 79 struct completion wait; /* For SCSI commands */ 80 struct st_buffer *buffer; 81 82 /* Drive characteristics */ 83 unsigned char omit_blklims; 84 unsigned char do_auto_lock; 85 unsigned char can_bsr; 86 unsigned char can_partitions; 87 unsigned char two_fm; 88 unsigned char fast_mteom; 89 unsigned char immediate; 90 unsigned char restr_dma; 91 unsigned char scsi2_logical; 92 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ 93 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ 94 unsigned char cln_sense_value; 95 unsigned char cln_sense_mask; 96 unsigned char use_pf; /* Set Page Format bit in all mode selects? */ 97 unsigned char try_dio; /* try direct i/o? */ 98 unsigned char c_algo; /* compression algorithm */ 99 unsigned char pos_unknown; /* after reset position unknown */ 100 int tape_type; 101 int long_timeout; /* timeout for commands known to take long time */ 102 103 unsigned long max_pfn; /* the maximum page number reachable by the HBA */ 104 105 /* Mode characteristics */ 106 struct st_modedef modes[ST_NBR_MODES]; 107 int current_mode; 108 109 /* Status variables */ 110 int partition; 111 int new_partition; 112 int nbr_partitions; /* zero until partition support enabled */ 113 struct st_partstat ps[ST_NBR_PARTITIONS]; 114 unsigned char dirty; 115 unsigned char ready; 116 unsigned char write_prot; 117 unsigned char drv_write_prot; 118 unsigned char in_use; 119 unsigned char blksize_changed; 120 unsigned char density_changed; 121 unsigned char compression_changed; 122 unsigned char drv_buffer; 123 unsigned char density; 124 unsigned char door_locked; 125 unsigned char autorew_dev; /* auto-rewind device */ 126 unsigned char rew_at_close; /* rewind necessary at close */ 127 unsigned char inited; 128 unsigned char cleaning_req; /* cleaning requested? */ 129 int block_size; 130 int min_block; 131 int max_block; 132 int recover_count; /* From tape opening */ 133 int recover_reg; /* From last status call */ 134 135#if DEBUG 136 unsigned char write_pending; 137 int nbr_finished; 138 int nbr_waits; 139 int nbr_requests; 140 int nbr_dio; 141 int nbr_pages; 142 int nbr_combinable; 143 unsigned char last_cmnd[6]; 144 unsigned char last_sense[16]; 145#endif 146 struct gendisk *disk; 147}; 148 149/* Bit masks for use_pf */ 150#define USE_PF 1 151#define PF_TESTED 2 152 153/* Values of eof */ 154#define ST_NOEOF 0 155#define ST_FM_HIT 1 156#define ST_FM 2 157#define ST_EOM_OK 3 158#define ST_EOM_ERROR 4 159#define ST_EOD_1 5 160#define ST_EOD_2 6 161#define ST_EOD 7 162/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 163 return zero => ST_EOD, return ENOSPC */ 164/* When writing: ST_EOM_OK == early warning found, write OK 165 ST_EOD_1 == allow trying new write after early warning 166 ST_EOM_ERROR == early warning found, not able to write all */ 167 168/* Values of rw */ 169#define ST_IDLE 0 170#define ST_READING 1 171#define ST_WRITING 2 172 173/* Values of ready state */ 174#define ST_READY 0 175#define ST_NOT_READY 1 176#define ST_NO_TAPE 2 177 178/* Values for door lock state */ 179#define ST_UNLOCKED 0 180#define ST_LOCKED_EXPLICIT 1 181#define ST_LOCKED_AUTO 2 182#define ST_LOCK_FAILS 3 183 184/* Positioning SCSI-commands for Tandberg, etc. drives */ 185#define QFA_REQUEST_BLOCK 0x02 186#define QFA_SEEK_BLOCK 0x0c 187 188/* Setting the binary options */ 189#define ST_DONT_TOUCH 0 190#define ST_NO 1 191#define ST_YES 2 192 193#define EXTENDED_SENSE_START 18 194 195#endif 196