Root/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
47enum 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
71enum 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
86typedef u64 __bitwise fs64;
87typedef u32 __bitwise fs32;
88typedef u16 __bitwise fs16;
89
90typedef u64 befs_off_t;
91typedef fs64 befs_time_t;
92
93/* Block runs */
94typedef struct {
95    fs32 allocation_group;
96    fs16 start;
97    fs16 len;
98} PACKED befs_disk_block_run;
99
100typedef struct {
101    u32 allocation_group;
102    u16 start;
103    u16 len;
104} PACKED befs_block_run;
105
106typedef befs_disk_block_run befs_disk_inode_addr;
107typedef befs_block_run befs_inode_addr;
108
109/*
110 * The Superblock Structure
111 */
112typedef 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 */
146typedef 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
156typedef 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 */
167typedef 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 */
175typedef 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
206enum 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
216typedef 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
226typedef 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 stucture of each btree node
238 */
239typedef 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
247typedef 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 */
256

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