workbench/fs/fat/fat_fs.h

   1 /*
   2  * fat.handler - FAT12/16/32 filesystem handler
   3  *
   4  * Copyright © 2006 Marek Szyprowski
   5  * Copyright © 2007 The AROS Development Team
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the same terms as AROS itself.
   9  *
  10  * $Id$
  11  */
  12
  13 #ifndef FAT_HANDLER_H
  14 #define FAT_HANDLER_H
  15
  16 #define __DEBUG__ 1
  17
  18 #include <aros/libcall.h>
  19 #include <devices/trackdisk.h>
  20
  21 #include "fat_struct.h"
  22
  23 /* filesystem structures */
  24
  25 #define ID_FAT_DISK 0x46415400UL
  26
  27 #define ID_FAT12_DISK 0x46415400UL
  28 #define ID_FAT16_DISK 0x46415401UL
  29 #define ID_FAT32_DISK 0x46415402UL
  30
  31 #define ACTION_VOLUME_ADD 16000
  32 #define ACTION_VOLUME_REMOVE 16001
  33
  34 extern struct Globals *glob;
  35
  36 #define DEF_POOL_SIZE 65536
  37 #define DEF_POOL_TRESHOLD DEF_POOL_SIZE
  38 #define DEF_BUFF_LINES 128
  39 #define DEF_READ_AHEAD 16*1024
  40 /*
  41 struct CacheBuffer {
  42         struct CacheBuffer *next;
  43         ULONG count;
  44         ULONG block;
  45         void *data;
  46         ULONG magic;
  47 };
  48 */
  49 struct Extent
  50 {
  51         ULONG sector;
  52         ULONG count;
  53         ULONG offset;
  54         ULONG cur_cluster;
  55         ULONG next_cluster;
  56         ULONG start_cluster;
  57         ULONG last_cluster;
  58 };
  59
  60 struct DirCache
  61 {
  62         struct Extent *e;
  63         void *buffer;
  64         ULONG cur_sector;
  65 };
  66
  67 #define fl_Key entry
  68
  69 #define FAT_ROOTDIR_MARK        0xFFFFFFFFlu
  70
  71 struct ExtFileLock
  72 {
  73         /* struct FileLock */
  74         BPTR            fl_Link;
  75         ULONG                   entry;
  76         LONG            fl_Access;
  77         struct MsgPort *fl_Task;
  78         BPTR            fl_Volume;
  79
  80         /* coinsistency check */
  81         ULONG                   magic;
  82
  83         /* my directory start cluster */
  84         ULONG               cluster;
  85
  86         ULONG                   attr;
  87         ULONG                   size;
  88         ULONG                   first_cluster;
  89
  90         struct Extent   data_ext[1];
  91
  92         /* dir entry cache for easy and quick management of long files */
  93
  94         /* used in directory scanning and file reading */
  95         ULONG                   pos;
  96
  97         UBYTE                   name[108];
  98
  99         BOOL                    dircache_active;
 100         struct DirCache dircache[1];
 101 };
 102
 103 struct VolumeInfo {
 104     UBYTE               name[32];     /* BCPL string */
 105     struct DateStamp    create_time;
 106 };
 107
 108 struct FSSuper {
 109         struct FSSuper *next;
 110         struct DosList *doslist;
 111
 112         ULONG sectorsize;
 113         ULONG sectorsize_bits;
 114
 115         ULONG clustersize;
 116         ULONG clustersize_bits;
 117         ULONG cluster_sectors_bits;
 118
 119         ULONG first_fat_sector;
 120         ULONG first_data_sector;
 121         ULONG first_rootdir_sector;
 122
 123         ULONG rootdir_sectors;
 124         ULONG total_sectors;
 125         ULONG data_sectors;
 126         ULONG clusters_count;
 127         ULONG fat_size;
 128
 129         ULONG free_clusters;
 130
 131         ULONG volume_id;
 132         ULONG type;
 133         ULONG eoc_mark;
 134
 135         UBYTE *fat;
 136         ULONG fat32_cachesize;
 137         ULONG fat32_cachesize_bits;
 138         ULONG fat32_cache_block;
 139
 140         struct Extent first_rootdir_extent[1];
 141
 142         struct VolumeInfo volume;
 143
 144         /* function table */
 145         ULONG (*func_get_fat_entry)(struct FSSuper *sb, ULONG n);
 146         /* ... */
 147 };
 148
 149
 150 struct Globals {
 151         /* mem/task */
 152     struct Task *ourtask;
 153     struct MsgPort *ourport;
 154         APTR mempool;
 155
 156         /* fs */
 157         struct DosList *devnode;
 158         struct FileSysStartupMsg *fssm;
 159         LONG quit;
 160         BOOL autodetect;
 161
 162         /* io */
 163         struct IOExtTD *diskioreq;
 164         struct IOExtTD *diskchgreq;
 165         struct MsgPort *diskport;
 166         LONG blocksize;
 167
 168         /* volumes */
 169         struct FSSuper *sb;    /* current sb */
 170         struct FSSuper *sblist;   /* list of sbs with outstanding locks */
 171
 172         /* disk status */
 173     LONG disk_inserted;
 174         LONG disk_inhibited;
 175 };
 176
 177 #include "support.h"
 178
 179 #endif