1 /* 2 Copyright 1999-2001, Be Incorporated. All Rights Reserved. 3 This file may be used under the terms of the Be Sample Code License. 4 */ 5 #ifndef _DOSFS_H_ 6 #define _DOSFS_H_ 7 8 9 #include "system_dependencies.h" 10 11 12 //#define DEBUG 1 13 14 15 #define LOCK(l) recursive_lock_lock(&l); 16 #define UNLOCK(l) recursive_lock_unlock(&l); 17 18 19 /* Unfortunately, ino_t's are defined as signed. This causes problems with 20 * programs (notably cp) that use the modulo of a ino_t as a 21 * hash function to index an array. This means the high bit of every ino_t 22 * is off-limits. Luckily, FAT32 is actually FAT28, so dosfs can make do with 23 * only 63 bits. 24 */ 25 #define ARTIFICIAL_VNID_BITS (0x6LL << 60) 26 #define DIR_CLUSTER_VNID_BITS (0x4LL << 60) 27 #define DIR_INDEX_VNID_BITS 0 28 #define INVALID_VNID_BITS_MASK (0x9LL << 60) 29 30 #define IS_DIR_CLUSTER_VNID(vnid) \ 31 (((vnid) & ARTIFICIAL_VNID_BITS) == DIR_CLUSTER_VNID_BITS) 32 33 #define IS_DIR_INDEX_VNID(vnid) \ 34 (((vnid) & ARTIFICIAL_VNID_BITS) == DIR_INDEX_VNID_BITS) 35 36 #define IS_ARTIFICIAL_VNID(vnid) \ 37 (((vnid) & ARTIFICIAL_VNID_BITS) == ARTIFICIAL_VNID_BITS) 38 39 #define IS_INVALID_VNID(vnid) \ 40 ((!IS_DIR_CLUSTER_VNID((vnid)) && \ 41 !IS_DIR_INDEX_VNID((vnid)) && \ 42 !IS_ARTIFICIAL_VNID((vnid))) || \ 43 ((vnid) & INVALID_VNID_BITS_MASK)) 44 45 #define GENERATE_DIR_INDEX_VNID(dircluster, index) \ 46 (DIR_INDEX_VNID_BITS | ((ino_t)(dircluster) << 32) | (index)) 47 48 #define GENERATE_DIR_CLUSTER_VNID(dircluster, filecluster) \ 49 (DIR_CLUSTER_VNID_BITS | ((ino_t)(dircluster) << 32) | (filecluster)) 50 51 #define CLUSTER_OF_DIR_CLUSTER_VNID(vnid) \ 52 ((uint32)((vnid) & 0xffffffff)) 53 54 #define INDEX_OF_DIR_INDEX_VNID(vnid) \ 55 ((uint32)((vnid) & 0xffffffff)) 56 57 #define DIR_OF_VNID(vnid) \ 58 ((uint32)(((vnid) >> 32) & ~0xf0000000)) 59 60 #define VNODE_PARENT_DIR_CLUSTER(vnode) \ 61 CLUSTER_OF_DIR_CLUSTER_VNID((vnode)->dir_vnid) 62 63 64 typedef struct vnode { 65 ino_t vnid; // self id 66 ino_t dir_vnid; // parent vnode id (directory containing entry) 67 void *cache; 68 void *file_map; 69 70 uint32 disk_image; // 0 = no, 1 = BEOS, 2 = IMAGE.BE 71 72 /* iteration is incremented each time the fat chain changes. it's used by 73 * the file read/write code to determine if it needs to retraverse the 74 * fat chain 75 */ 76 uint32 iteration; 77 78 /* any changes to this block of information should immediately be reflected 79 * on the disk (or at least in the cache) so that get_next_dirent continues 80 * to function properly 81 */ 82 uint32 sindex, eindex; // starting and ending index of directory entry 83 uint32 cluster; // starting cluster of the data 84 uint32 mode; // dos-style attributes 85 off_t st_size; // in bytes 86 time_t st_time; 87 time_t st_crtim; 88 89 uint32 end_cluster; // last cluster of the data 90 91 const char *mime; // mime type (null if none) 92 93 bool dirty; // track if vnode had been written to 94 95 char *filename; 96 } vnode; 97 98 // mode bits 99 #define FAT_READ_ONLY 1 100 #define FAT_HIDDEN 2 101 #define FAT_SYSTEM 4 102 #define FAT_VOLUME 8 103 #define FAT_SUBDIR 16 104 #define FAT_ARCHIVE 32 105 106 107 struct vcache_entry; 108 109 typedef struct _nspace { 110 fs_volume *volume; // fs_volume passed in to fs_mount 111 dev_t id; 112 int fd; // File descriptor 113 char device[256]; 114 uint32 flags; // see <fcntl.be.h> for modes 115 void *fBlockCache; 116 117 // info from bpb 118 uint32 bytes_per_sector; 119 uint32 sectors_per_cluster; 120 uint32 reserved_sectors; 121 uint32 fat_count; 122 uint32 root_entries_count; 123 uint32 total_sectors; 124 uint32 sectors_per_fat; 125 uint8 media_descriptor; 126 uint16 fsinfo_sector; 127 128 uint32 total_clusters; // data clusters, that is 129 uint32 free_clusters; 130 uint8 fat_bits; 131 bool fat_mirrored; // true if fat mirroring on 132 uint8 active_fat; 133 134 uint32 root_start; // for fat12 + fat16 only 135 uint32 root_sectors; // for fat12 + fat16 only 136 vnode root_vnode; // root directory 137 int32 vol_entry; // index in root directory 138 char vol_label[12]; // lfn's need not apply 139 140 uint32 data_start; 141 uint32 last_allocated; // last allocated cluster 142 143 ino_t beos_vnid; // vnid of \BEOS directory 144 bool respect_disk_image; 145 146 int fs_flags; // flags for this mount 147 148 recursive_lock vlock; // volume lock 149 150 // vcache state 151 struct { 152 rw_lock lock; 153 ino_t cur_vnid; 154 uint32 cache_size; 155 struct vcache_entry **by_vnid, **by_loc; 156 } vcache; 157 158 struct { 159 uint32 entries; 160 uint32 allocated; 161 ino_t *vnid_list; 162 } dlist; 163 } nspace; 164 165 #define FS_FLAGS_OP_SYNC 0x1 166 #define FS_FLAGS_LOCK_DOOR 0x2 167 168 #define LOCK_VOL(vol) \ 169 if (vol == NULL) { dprintf("null vol\n"); return EINVAL; } else LOCK((vol)->vlock) 170 171 #define UNLOCK_VOL(vol) \ 172 UNLOCK((vol)->vlock) 173 174 #define TOUCH(x) ((void)(x)) 175 176 extern fs_vnode_ops gFATVnodeOps; 177 extern fs_volume_ops gFATVolumeOps; 178 179 /* debug levels */ 180 extern int debug_attr, debug_dir, debug_dlist, debug_dosfs, debug_encodings, 181 debug_fat, debug_file, debug_iter, debug_vcache; 182 183 status_t _dosfs_sync(nspace *vol); 184 185 #endif 186