1 2#ifndef _ST_H 3#define _ST_H 4 5#ifndef _SCSI_H 6#include "scsi.h" 7#endif 8#include <linux/devfs_fs_kernel.h> 9#include <linux/completion.h> 10 11/* The tape buffer descriptor. */ 12typedef struct { 13 unsigned char in_use; 14 unsigned char dma; /* DMA-able buffer */ 15 int buffer_size; 16 int buffer_blocks; 17 int buffer_bytes; 18 int read_pointer; 19 int writing; 20 int midlevel_result; 21 int syscall_result; 22 Scsi_Request *last_SRpnt; 23 unsigned char *b_data; 24 unsigned short use_sg; /* zero or number of segments for this adapter */ 25 unsigned short sg_segs; /* total number of allocated segments */ 26 unsigned short orig_sg_segs; /* number of segments allocated at first try */ 27 unsigned int *sg_lengths; 28 struct scatterlist sg[1]; /* MUST BE last item */ 29} ST_buffer; 30 31 32/* The tape mode definition */ 33typedef struct { 34 unsigned char defined; 35 unsigned char sysv; /* SYS V semantics? */ 36 unsigned char do_async_writes; 37 unsigned char do_buffer_writes; 38 unsigned char do_read_ahead; 39 unsigned char defaults_for_writes; 40 unsigned char default_compression; /* 0 = don't touch, etc */ 41 short default_density; /* Forced density, -1 = no value */ 42 int default_blksize; /* Forced blocksize, -1 = no value */ 43} ST_mode; 44 45#define ST_NBR_MODE_BITS 2 46#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) 47#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) 48#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) 49#define ST_MAX_TAPES (1 << ST_MODE_SHIFT) 50 51/* The status related to each partition */ 52typedef struct { 53 unsigned char rw; 54 unsigned char eof; 55 unsigned char at_sm; 56 unsigned char last_block_valid; 57 u32 last_block_visited; 58 int drv_block; /* The block where the drive head is */ 59 int drv_file; 60} ST_partstat; 61 62#define ST_NBR_PARTITIONS 4 63 64/* The tape drive descriptor */ 65typedef struct { 66 kdev_t devt; 67 Scsi_Device *device; 68 struct semaphore lock; /* For serialization */ 69 struct completion wait; /* For SCSI commands */ 70 ST_buffer *buffer; 71 72 /* Drive characteristics */ 73 unsigned char omit_blklims; 74 unsigned char do_auto_lock; 75 unsigned char can_bsr; 76 unsigned char can_partitions; 77 unsigned char two_fm; 78 unsigned char fast_mteom; 79 unsigned char immediate; 80 unsigned char restr_dma; 81 unsigned char scsi2_logical; 82 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ 83 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ 84 unsigned char cln_sense_value; 85 unsigned char cln_sense_mask; 86 unsigned char use_pf; /* Set Page Format bit in all mode selects? */ 87 unsigned char c_algo; /* compression algorithm */ 88 int tape_type; 89 int write_threshold; 90 int timeout; /* timeout for normal commands */ 91 int long_timeout; /* timeout for commands known to take long time */ 92 93 /* Mode characteristics */ 94 ST_mode modes[ST_NBR_MODES]; 95 int current_mode; 96 devfs_handle_t de_r[ST_NBR_MODES]; /* Rewind entries */ 97 devfs_handle_t de_n[ST_NBR_MODES]; /* No-rewind entries */ 98 99 /* Status variables */ 100 int partition; 101 int new_partition; 102 int nbr_partitions; /* zero until partition support enabled */ 103 ST_partstat ps[ST_NBR_PARTITIONS]; 104 unsigned char dirty; 105 unsigned char ready; 106 unsigned char write_prot; 107 unsigned char drv_write_prot; 108 unsigned char in_use; 109 unsigned char blksize_changed; 110 unsigned char density_changed; 111 unsigned char compression_changed; 112 unsigned char drv_buffer; 113 unsigned char density; 114 unsigned char door_locked; 115 unsigned char autorew_dev; /* auto-rewind device */ 116 unsigned char rew_at_close; /* rewind necessary at close */ 117 unsigned char inited; 118 unsigned char cleaning_req; /* cleaning requested? */ 119 int block_size; 120 int min_block; 121 int max_block; 122 int recover_count; /* From tape opening */ 123 int recover_reg; /* From last status call */ 124 125#if DEBUG 126 unsigned char write_pending; 127 int nbr_finished; 128 int nbr_waits; 129 unsigned char last_cmnd[6]; 130 unsigned char last_sense[16]; 131#endif 132} Scsi_Tape; 133 134/* Bit masks for use_pf */ 135#define USE_PF 1 136#define PF_TESTED 2 137 138/* Values of eof */ 139#define ST_NOEOF 0 140#define ST_FM_HIT 1 141#define ST_FM 2 142#define ST_EOM_OK 3 143#define ST_EOM_ERROR 4 144#define ST_EOD_1 5 145#define ST_EOD_2 6 146#define ST_EOD 7 147/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 148 return zero => ST_EOD, return ENOSPC */ 149 150/* Values of rw */ 151#define ST_IDLE 0 152#define ST_READING 1 153#define ST_WRITING 2 154 155/* Values of ready state */ 156#define ST_READY 0 157#define ST_NOT_READY 1 158#define ST_NO_TAPE 2 159 160/* Values for door lock state */ 161#define ST_UNLOCKED 0 162#define ST_LOCKED_EXPLICIT 1 163#define ST_LOCKED_AUTO 2 164#define ST_LOCK_FAILS 3 165 166/* Positioning SCSI-commands for Tandberg, etc. drives */ 167#define QFA_REQUEST_BLOCK 0x02 168#define QFA_SEEK_BLOCK 0x0c 169 170/* Setting the binary options */ 171#define ST_DONT_TOUCH 0 172#define ST_NO 1 173#define ST_YES 2 174 175#define EXTENDED_SENSE_START 18 176 177#endif 178