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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | #ifndef _ST_H #define _ST_H /* $Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/st.h,v 1.1 1992/04/24 18:01:50 root Exp root $ */ #ifndef _SCSI_H #include "scsi.h" #endif #include <linux/devfs_fs_kernel.h> /* The tape buffer descriptor. */ typedef struct { unsigned char in_use; unsigned char dma; /* DMA-able buffer */ int buffer_size; int buffer_blocks; int buffer_bytes; int read_pointer; int writing; int midlevel_result; int syscall_result; Scsi_Request *last_SRpnt; unsigned char *b_data; unsigned short use_sg; /* zero or number of segments for this adapter */ unsigned short sg_segs; /* total number of allocated segments */ unsigned short orig_sg_segs; /* number of segments allocated at first try */ struct scatterlist sg[1]; /* MUST BE last item */ } ST_buffer; /* The tape mode definition */ typedef struct { unsigned char defined; unsigned char sysv; /* SYS V semantics? */ unsigned char do_async_writes; unsigned char do_buffer_writes; unsigned char do_read_ahead; unsigned char defaults_for_writes; unsigned char default_compression; /* 0 = don't touch, etc */ short default_density; /* Forced density, -1 = no value */ int default_blksize; /* Forced blocksize, -1 = no value */ } ST_mode; #define ST_NBR_MODE_BITS 2 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) #define ST_MAX_TAPES (1 << ST_MODE_SHIFT) /* The status related to each partition */ typedef struct { unsigned char rw; unsigned char eof; unsigned char at_sm; unsigned char last_block_valid; u32 last_block_visited; int drv_block; /* The block where the drive head is */ int drv_file; } ST_partstat; #define ST_NBR_PARTITIONS 4 /* The tape drive descriptor */ typedef struct { kdev_t devt; Scsi_Device *device; struct semaphore lock; /* For serialization */ struct semaphore sem; /* For SCSI commands */ ST_buffer *buffer; /* Drive characteristics */ unsigned char omit_blklims; unsigned char do_auto_lock; unsigned char can_bsr; unsigned char can_partitions; unsigned char two_fm; unsigned char fast_mteom; unsigned char restr_dma; unsigned char scsi2_logical; unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ int tape_type; int write_threshold; int timeout; /* timeout for normal commands */ int long_timeout; /* timeout for commands known to take long time */ /* Mode characteristics */ ST_mode modes[ST_NBR_MODES]; int current_mode; devfs_handle_t de_r[ST_NBR_MODES]; /* Rewind entries */ devfs_handle_t de_n[ST_NBR_MODES]; /* No-rewind entries */ /* Status variables */ int partition; int new_partition; int nbr_partitions; /* zero until partition support enabled */ ST_partstat ps[ST_NBR_PARTITIONS]; unsigned char dirty; unsigned char ready; unsigned char write_prot; unsigned char drv_write_prot; unsigned char in_use; unsigned char blksize_changed; unsigned char density_changed; unsigned char compression_changed; unsigned char drv_buffer; unsigned char density; unsigned char door_locked; unsigned char autorew_dev; /* auto-rewind device */ unsigned char rew_at_close; /* rewind necessary at close */ unsigned char inited; int block_size; int min_block; int max_block; int recover_count; /* From tape opening */ int recover_reg; /* From last status call */ #if DEBUG unsigned char write_pending; int nbr_finished; int nbr_waits; unsigned char last_cmnd[6]; unsigned char last_sense[16]; #endif } Scsi_Tape; /* Values of eof */ #define ST_NOEOF 0 #define ST_FM_HIT 1 #define ST_FM 2 #define ST_EOM_OK 3 #define ST_EOM_ERROR 4 #define ST_EOD_1 5 #define ST_EOD_2 6 #define ST_EOD 7 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => return zero => ST_EOD, return ENOSPC */ /* Values of rw */ #define ST_IDLE 0 #define ST_READING 1 #define ST_WRITING 2 /* Values of ready state */ #define ST_READY 0 #define ST_NOT_READY 1 #define ST_NO_TAPE 2 /* Values for door lock state */ #define ST_UNLOCKED 0 #define ST_LOCKED_EXPLICIT 1 #define ST_LOCKED_AUTO 2 #define ST_LOCK_FAILS 3 /* Positioning SCSI-commands for Tandberg, etc. drives */ #define QFA_REQUEST_BLOCK 0x02 #define QFA_SEEK_BLOCK 0x0c /* Setting the binary options */ #define ST_DONT_TOUCH 0 #define ST_NO 1 #define ST_YES 2 #endif |