fs/befs/befs_fs_types.h

   1 /*
   2  * fs/befs/befs_fs_types.h
   3  *
   4  * Copyright (C) 2001 Will Dyson (will@cs.earlham.edu)
   5  *
   6  *
   7  *
   8  * from linux/include/linux/befs_fs.h
   9  *
  10  * Copyright (C) 1999 Makoto Kato (m_kato@ga2.so-net.ne.jp)
  11  *
  12  */
  13
  14 #ifndef _LINUX_BEFS_FS_TYPES
  15 #define _LINUX_BEFS_FS_TYPES
  16
  17 #ifdef __KERNEL__
  18 #include <linux/types.h>
  19 #endif /*__KERNEL__*/
  20
  21 #define PACKED __attribute__ ((__packed__))
  22
  23 /*
  24  * Max name lengths of BFS
  25  */
  26
  27 #define BEFS_NAME_LEN 255
  28
  29 #define BEFS_SYMLINK_LEN 144
  30 #define BEFS_NUM_DIRECT_BLOCKS 12
  31 #define B_OS_NAME_LENGTH 32
  32
  33 /* The datastream blocks mapped by the double-indirect
  34  * block are always 4 fs blocks long.
  35  * This eliminates the need for linear searches among
  36  * the potentially huge number of indirect blocks
  37  *
  38  * Err. Should that be 4 fs blocks or 4k???
  39  * It matters on large blocksize volumes
  40  */
  41 #define BEFS_DBLINDIR_BRUN_LEN 4
  42
  43 /*
  44  * Flags of superblock
  45  */
  46
  47 enum super_flags {
  48         BEFS_BYTESEX_BE,
  49         BEFS_BYTESEX_LE,
  50         BEFS_CLEAN = 0x434c454e,
  51         BEFS_DIRTY = 0x44495254,
  52         BEFS_SUPER_MAGIC1 = 0x42465331, /* BFS1 */
  53         BEFS_SUPER_MAGIC2 = 0xdd121031,
  54         BEFS_SUPER_MAGIC3 = 0x15b6830e,
  55 };
  56
  57 #define BEFS_BYTEORDER_NATIVE 0x42494745
  58 #define BEFS_BYTEORDER_NATIVE_LE (__force fs32)cpu_to_le32(BEFS_BYTEORDER_NATIVE)
  59 #define BEFS_BYTEORDER_NATIVE_BE (__force fs32)cpu_to_be32(BEFS_BYTEORDER_NATIVE)
  60
  61 #define BEFS_SUPER_MAGIC BEFS_SUPER_MAGIC1
  62 #define BEFS_SUPER_MAGIC1_LE (__force fs32)cpu_to_le32(BEFS_SUPER_MAGIC1)
  63 #define BEFS_SUPER_MAGIC1_BE (__force fs32)cpu_to_be32(BEFS_SUPER_MAGIC1)
  64
  65 /*
  66  * Flags of inode
  67  */
  68
  69 #define BEFS_INODE_MAGIC1 0x3bbe0ad9
  70
  71 enum inode_flags {
  72         BEFS_INODE_IN_USE = 0x00000001,
  73         BEFS_ATTR_INODE = 0x00000004,
  74         BEFS_INODE_LOGGED = 0x00000008,
  75         BEFS_INODE_DELETED = 0x00000010,
  76         BEFS_LONG_SYMLINK = 0x00000040,
  77         BEFS_PERMANENT_FLAG = 0x0000ffff,
  78         BEFS_INODE_NO_CREATE = 0x00010000,
  79         BEFS_INODE_WAS_WRITTEN = 0x00020000,
  80         BEFS_NO_TRANSACTION = 0x00040000,
  81 };
  82 /*
  83  * On-Disk datastructures of BeFS
  84  */
  85
  86 typedef u64 __bitwise fs64;
  87 typedef u32 __bitwise fs32;
  88 typedef u16 __bitwise fs16;
  89
  90 typedef u64 befs_off_t;
  91 typedef fs64 befs_time_t;
  92
  93 /* Block runs */
  94 typedef struct {
  95         fs32 allocation_group;
  96         fs16 start;
  97         fs16 len;
  98 } PACKED befs_disk_block_run;
  99
 100 typedef struct {
 101         u32 allocation_group;
 102         u16 start;
 103         u16 len;
 104 } PACKED befs_block_run;
 105
 106 typedef befs_disk_block_run befs_disk_inode_addr;
 107 typedef befs_block_run befs_inode_addr;
 108
 109 /*
 110  * The Superblock Structure
 111  */
 112 typedef struct {
 113         char name[B_OS_NAME_LENGTH];
 114         fs32 magic1;
 115         fs32 fs_byte_order;
 116
 117         fs32 block_size;
 118         fs32 block_shift;
 119
 120         fs64 num_blocks;
 121         fs64 used_blocks;
 122
 123         fs32 inode_size;
 124
 125         fs32 magic2;
 126         fs32 blocks_per_ag;
 127         fs32 ag_shift;
 128         fs32 num_ags;
 129
 130         fs32 flags;
 131
 132         befs_disk_block_run log_blocks;
 133         fs64 log_start;
 134         fs64 log_end;
 135
 136         fs32 magic3;
 137         befs_disk_inode_addr root_dir;
 138         befs_disk_inode_addr indices;
 139
 140 } PACKED befs_super_block;
 141
 142 /*
 143  * Note: the indirect and dbl_indir block_runs may
 144  * be longer than one block!
 145  */
 146 typedef struct {
 147         befs_disk_block_run direct[BEFS_NUM_DIRECT_BLOCKS];
 148         fs64 max_direct_range;
 149         befs_disk_block_run indirect;
 150         fs64 max_indirect_range;
 151         befs_disk_block_run double_indirect;
 152         fs64 max_double_indirect_range;
 153         fs64 size;
 154 } PACKED befs_disk_data_stream;
 155
 156 typedef struct {
 157         befs_block_run direct[BEFS_NUM_DIRECT_BLOCKS];
 158         befs_off_t max_direct_range;
 159         befs_block_run indirect;
 160         befs_off_t max_indirect_range;
 161         befs_block_run double_indirect;
 162         befs_off_t max_double_indirect_range;
 163         befs_off_t size;
 164 } PACKED befs_data_stream;
 165
 166 /* Attribute */
 167 typedef struct {
 168         fs32 type;
 169         fs16 name_size;
 170         fs16 data_size;
 171         char name[1];
 172 } PACKED befs_small_data;
 173
 174 /* Inode structure */
 175 typedef struct {
 176         fs32 magic1;
 177         befs_disk_inode_addr inode_num;
 178         fs32 uid;
 179         fs32 gid;
 180         fs32 mode;
 181         fs32 flags;
 182         befs_time_t create_time;
 183         befs_time_t last_modified_time;
 184         befs_disk_inode_addr parent;
 185         befs_disk_inode_addr attributes;
 186         fs32 type;
 187
 188         fs32 inode_size;
 189         fs32 etc;               /* not use */
 190
 191         union {
 192                 befs_disk_data_stream datastream;
 193                 char symlink[BEFS_SYMLINK_LEN];
 194         } data;
 195
 196         fs32 pad[4];            /* not use */
 197         befs_small_data small_data[1];
 198 } PACKED befs_inode;
 199
 200 /*
 201  * B+tree superblock
 202  */
 203
 204 #define BEFS_BTREE_MAGIC 0x69f6c2e8
 205
 206 enum btree_types {
 207         BTREE_STRING_TYPE = 0,
 208         BTREE_INT32_TYPE = 1,
 209         BTREE_UINT32_TYPE = 2,
 210         BTREE_INT64_TYPE = 3,
 211         BTREE_UINT64_TYPE = 4,
 212         BTREE_FLOAT_TYPE = 5,
 213         BTREE_DOUBLE_TYPE = 6
 214 };
 215
 216 typedef struct {
 217         fs32 magic;
 218         fs32 node_size;
 219         fs32 max_depth;
 220         fs32 data_type;
 221         fs64 root_node_ptr;
 222         fs64 free_node_ptr;
 223         fs64 max_size;
 224 } PACKED befs_disk_btree_super;
 225
 226 typedef struct {
 227         u32 magic;
 228         u32 node_size;
 229         u32 max_depth;
 230         u32 data_type;
 231         befs_off_t root_node_ptr;
 232         befs_off_t free_node_ptr;
 233         befs_off_t max_size;
 234 } PACKED befs_btree_super;
 235
 236 /*
 237  * Header structure of each btree node
 238  */
 239 typedef struct {
 240         fs64 left;
 241         fs64 right;
 242         fs64 overflow;
 243         fs16 all_key_count;
 244         fs16 all_key_length;
 245 } PACKED befs_btree_nodehead;
 246
 247 typedef struct {
 248         befs_off_t left;
 249         befs_off_t right;
 250         befs_off_t overflow;
 251         u16 all_key_count;
 252         u16 all_key_length;
 253 } PACKED befs_host_btree_nodehead;
 254
 255 #endif                          /* _LINUX_BEFS_FS_TYPES */