Loading...
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 | #ifndef _ZFTAPE_RW_H #define _ZFTAPE_RW_H /* * Copyright (C) 1996, 1997 Claus-Justus Heine. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. * * $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-rw.h,v $ * $Revision: 1.2 $ * $Date: 1997/10/05 19:19:09 $ * * This file contains the definitions for the read and write * functions for the QIC-117 floppy-tape driver for Linux. * */ #include <linux/config.h> /* for CONFIG_ZFT_DFLT_BLK_SZ */ #include "../zftape/zftape-buffers.h" #define SEGMENTS_PER_TAPE (ft_segments_per_track * ft_tracks_per_tape) /* QIC-113 Rev. G says that `a maximum of 63488 raw bytes may be * compressed into a single frame'. * Maybe we should stick to 32kb to make it more `beautiful' */ #define ZFT_MAX_BLK_SZ (62*1024) /* bytes */ #if !defined(CONFIG_ZFT_DFLT_BLK_SZ) # define CONFIG_ZFT_DFLT_BLK_SZ (10*1024) /* bytes, default of gnu tar */ #elif CONFIG_ZFT_DFLT_BLK_SZ == 0 # undef CONFIG_ZFT_DFLT_BLK_SZ # define CONFIG_ZFT_DFLT_BLK_SZ 1 #elif (CONFIG_ZFT_DFLT_BLK_SZ % 1024) != 0 # error CONFIG_ZFT_DFLT_BLK_SZ must be 1 or a multiple of 1024 #endif /* The *optional* compression routines need some overhead per tape * block for their purposes. Instead of asking the actual compression * implementation how much it needs, we restrict this overhead to be * maximal of ZFT_CMPT_OVERHEAD size. We need this for EOT * conditions. The tape is assumed to be logical at EOT when the * distance from the physical EOT is less than * one tape block + ZFT_CMPR_OVERHEAD */ #define ZFT_CMPR_OVERHEAD 16 /* bytes */ typedef enum { zft_idle = 0, zft_reading, zft_writing, } zft_status_enum; typedef struct /* all values measured in bytes */ { int seg_pos; /* segment currently positioned at */ int seg_byte_pos; /* offset in current segment */ __s64 tape_pos; /* real offset from BOT */ __s64 volume_pos; /* pos. in uncompressed data stream in * current volume */ } zft_position; extern zft_position zft_pos; extern __u8 *zft_deblock_buf; extern __u8 *zft_hseg_buf; extern int zft_deblock_segment; extern zft_status_enum zft_io_state; extern int zft_header_changed; extern int zft_bad_sector_map_changed; extern int zft_qic113; /* conform to old specs. and old zftape */ extern int zft_use_compression; extern unsigned int zft_blk_sz; extern __s64 zft_capacity; extern unsigned int zft_written_segments; extern int zft_label_changed; /* zftape-rw.c exported functions */ extern unsigned int zft_get_seg_sz(unsigned int segment); extern void zft_set_flags(unsigned int minor_unit); extern int zft_calc_seg_byte_coord(int *seg_byte_pos, __s64 tape_pos); extern __s64 zft_calc_tape_pos(int segment); extern __s64 zft_get_capacity(void); extern void zft_update_label(__u8 *buffer); extern int zft_erase(void); extern int zft_verify_write_segments(unsigned int segment, __u8 *data, size_t size, __u8 *buffer); extern unsigned int zft_get_time(void); #endif /* _ZFTAPE_RW_H */ |