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. */ 12 typedef 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 */ 33 typedef 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 */ 52 typedef 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 */ 65 typedef 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 timeout; /* timeout for normal commands */ 90 int long_timeout; /* timeout for commands known to take long time */ 91 92 /* Mode characteristics */ 93 ST_mode modes[ST_NBR_MODES]; 94 int current_mode; 95 devfs_handle_t de_r[ST_NBR_MODES]; /* Rewind entries */ 96 devfs_handle_t de_n[ST_NBR_MODES]; /* No-rewind entries */ 97 98 /* Status variables */ 99 int partition; 100 int new_partition; 101 int nbr_partitions; /* zero until partition support enabled */ 102 ST_partstat ps[ST_NBR_PARTITIONS]; 103 unsigned char dirty; 104 unsigned char ready; 105 unsigned char write_prot; 106 unsigned char drv_write_prot; 107 unsigned char in_use; 108 unsigned char blksize_changed; 109 unsigned char density_changed; 110 unsigned char compression_changed; 111 unsigned char drv_buffer; 112 unsigned char density; 113 unsigned char door_locked; 114 unsigned char autorew_dev; /* auto-rewind device */ 115 unsigned char rew_at_close; /* rewind necessary at close */ 116 unsigned char inited; 117 unsigned char cleaning_req; /* cleaning requested? */ 118 int block_size; 119 int min_block; 120 int max_block; 121 int recover_count; /* From tape opening */ 122 int recover_reg; /* From last status call */ 123 124 #if DEBUG 125 unsigned char write_pending; 126 int nbr_finished; 127 int nbr_waits; 128 unsigned char last_cmnd[6]; 129 unsigned char last_sense[16]; 130 #endif 131 } Scsi_Tape; 132 133 /* Bit masks for use_pf */ 134 #define USE_PF 1 135 #define PF_TESTED 2 136 137 /* Values of eof */ 138 #define ST_NOEOF 0 139 #define ST_FM_HIT 1 140 #define ST_FM 2 141 #define ST_EOM_OK 3 142 #define ST_EOM_ERROR 4 143 #define ST_EOD_1 5 144 #define ST_EOD_2 6 145 #define ST_EOD 7 146 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 147 return zero => ST_EOD, return ENOSPC */ 148 149 /* Values of rw */ 150 #define ST_IDLE 0 151 #define ST_READING 1 152 #define ST_WRITING 2 153 154 /* Values of ready state */ 155 #define ST_READY 0 156 #define ST_NOT_READY 1 157 #define ST_NO_TAPE 2 158 159 /* Values for door lock state */ 160 #define ST_UNLOCKED 0 161 #define ST_LOCKED_EXPLICIT 1 162 #define ST_LOCKED_AUTO 2 163 #define ST_LOCK_FAILS 3 164 165 /* Positioning SCSI-commands for Tandberg, etc. drives */ 166 #define QFA_REQUEST_BLOCK 0x02 167 #define QFA_SEEK_BLOCK 0x0c 168 169 /* Setting the binary options */ 170 #define ST_DONT_TOUCH 0 171 #define ST_NO 1 172 #define ST_YES 2 173 174 #define EXTENDED_SENSE_START 18 175 176 #endif 177