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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
|
#ifndef SQUASHFS_FS
#define SQUASHFS_FS
/*
* Squashfs
*
* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
* Phillip Lougher <phillip@squashfs.org.uk>
*
* 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; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* squashfs_fs.h
*/
#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
#define SQUASHFS_MAJOR 4
#define SQUASHFS_MINOR 0
#define SQUASHFS_START 0
/* size of metadata (inode and directory) blocks */
#define SQUASHFS_METADATA_SIZE 8192
#define SQUASHFS_METADATA_LOG 13
/* default size of data blocks */
#define SQUASHFS_FILE_SIZE 131072
#define SQUASHFS_FILE_LOG 17
#define SQUASHFS_FILE_MAX_SIZE 1048576
#define SQUASHFS_FILE_MAX_LOG 20
/* Max number of uids and gids */
#define SQUASHFS_IDS 65536
/* Max length of filename (not 255) */
#define SQUASHFS_NAME_LEN 256
#define SQUASHFS_INVALID_FRAG (0xffffffffU)
#define SQUASHFS_INVALID_XATTR (0xffffffffU)
#define SQUASHFS_INVALID_BLK (-1LL)
/* Filesystem flags */
#define SQUASHFS_NOI 0
#define SQUASHFS_NOD 1
#define SQUASHFS_NOF 3
#define SQUASHFS_NO_FRAG 4
#define SQUASHFS_ALWAYS_FRAG 5
#define SQUASHFS_DUPLICATE 6
#define SQUASHFS_EXPORT 7
#define SQUASHFS_COMP_OPT 10
#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
SQUASHFS_NOI)
#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
SQUASHFS_NOD)
#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
SQUASHFS_NOF)
#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
SQUASHFS_NO_FRAG)
#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
SQUASHFS_ALWAYS_FRAG)
#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
SQUASHFS_DUPLICATE)
#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
SQUASHFS_EXPORT)
#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
SQUASHFS_COMP_OPT)
/* Max number of types and file types */
#define SQUASHFS_DIR_TYPE 1
#define SQUASHFS_REG_TYPE 2
#define SQUASHFS_SYMLINK_TYPE 3
#define SQUASHFS_BLKDEV_TYPE 4
#define SQUASHFS_CHRDEV_TYPE 5
#define SQUASHFS_FIFO_TYPE 6
#define SQUASHFS_SOCKET_TYPE 7
#define SQUASHFS_LDIR_TYPE 8
#define SQUASHFS_LREG_TYPE 9
#define SQUASHFS_LSYMLINK_TYPE 10
#define SQUASHFS_LBLKDEV_TYPE 11
#define SQUASHFS_LCHRDEV_TYPE 12
#define SQUASHFS_LFIFO_TYPE 13
#define SQUASHFS_LSOCKET_TYPE 14
/* Xattr types */
#define SQUASHFS_XATTR_USER 0
#define SQUASHFS_XATTR_TRUSTED 1
#define SQUASHFS_XATTR_SECURITY 2
#define SQUASHFS_XATTR_VALUE_OOL 256
#define SQUASHFS_XATTR_PREFIX_MASK 0xff
/* Flag whether block is compressed or uncompressed, bit is set if block is
* uncompressed */
#define SQUASHFS_COMPRESSED_BIT (1 << 15)
#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
~SQUASHFS_COMPRESSED_BIT_BLOCK)
#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
/*
* Inode number ops. Inodes consist of a compressed block number, and an
* uncompressed offset within that block
*/
#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
<< 16) + (B)))
/* Translate between VFS mode and squashfs mode */
#define SQUASHFS_MODE(A) ((A) & 0xfff)
/* fragment and fragment table defines */
#define SQUASHFS_FRAGMENT_BYTES(A) \
((A) * sizeof(struct squashfs_fragment_entry))
#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
SQUASHFS_METADATA_SIZE - 1) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
sizeof(u64))
/* inode lookup table defines */
#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
SQUASHFS_METADATA_SIZE - 1) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
sizeof(u64))
/* uid/gid lookup table defines */
#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
SQUASHFS_METADATA_SIZE - 1) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
sizeof(u64))
/* xattr id lookup table defines */
#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
SQUASHFS_METADATA_SIZE - 1) / \
SQUASHFS_METADATA_SIZE)
#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
sizeof(u64))
#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
/* cached data constants for filesystem */
#define SQUASHFS_CACHED_BLKS 8
#define SQUASHFS_MAX_FILE_SIZE_LOG 64
#define SQUASHFS_MAX_FILE_SIZE (1LL << \
(SQUASHFS_MAX_FILE_SIZE_LOG - 2))
/* meta index cache */
#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
#define SQUASHFS_META_ENTRIES 127
#define SQUASHFS_META_SLOTS 8
struct meta_entry {
u64 data_block;
unsigned int index_block;
unsigned short offset;
unsigned short pad;
};
struct meta_index {
unsigned int inode_number;
unsigned int offset;
unsigned short entries;
unsigned short skip;
unsigned short locked;
unsigned short pad;
struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
};
/*
* definitions for structures on disk
*/
#define ZLIB_COMPRESSION 1
#define LZMA_COMPRESSION 2
#define LZO_COMPRESSION 3
#define XZ_COMPRESSION 4
struct squashfs_super_block {
__le32 s_magic;
__le32 inodes;
__le32 mkfs_time;
__le32 block_size;
__le32 fragments;
__le16 compression;
__le16 block_log;
__le16 flags;
__le16 no_ids;
__le16 s_major;
__le16 s_minor;
__le64 root_inode;
__le64 bytes_used;
__le64 id_table_start;
__le64 xattr_id_table_start;
__le64 inode_table_start;
__le64 directory_table_start;
__le64 fragment_table_start;
__le64 lookup_table_start;
};
struct squashfs_dir_index {
__le32 index;
__le32 start_block;
__le32 size;
unsigned char name[0];
};
struct squashfs_base_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
};
struct squashfs_ipc_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
};
struct squashfs_lipc_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 xattr;
};
struct squashfs_dev_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 rdev;
};
struct squashfs_ldev_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 rdev;
__le32 xattr;
};
struct squashfs_symlink_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 symlink_size;
char symlink[0];
};
struct squashfs_reg_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 start_block;
__le32 fragment;
__le32 offset;
__le32 file_size;
__le16 block_list[0];
};
struct squashfs_lreg_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le64 start_block;
__le64 file_size;
__le64 sparse;
__le32 nlink;
__le32 fragment;
__le32 offset;
__le32 xattr;
__le16 block_list[0];
};
struct squashfs_dir_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 start_block;
__le32 nlink;
__le16 file_size;
__le16 offset;
__le32 parent_inode;
};
struct squashfs_ldir_inode {
__le16 inode_type;
__le16 mode;
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 nlink;
__le32 file_size;
__le32 start_block;
__le32 parent_inode;
__le16 i_count;
__le16 offset;
__le32 xattr;
struct squashfs_dir_index index[0];
};
union squashfs_inode {
struct squashfs_base_inode base;
struct squashfs_dev_inode dev;
struct squashfs_ldev_inode ldev;
struct squashfs_symlink_inode symlink;
struct squashfs_reg_inode reg;
struct squashfs_lreg_inode lreg;
struct squashfs_dir_inode dir;
struct squashfs_ldir_inode ldir;
struct squashfs_ipc_inode ipc;
struct squashfs_lipc_inode lipc;
};
struct squashfs_dir_entry {
__le16 offset;
__le16 inode_number;
__le16 type;
__le16 size;
char name[0];
};
struct squashfs_dir_header {
__le32 count;
__le32 start_block;
__le32 inode_number;
};
struct squashfs_fragment_entry {
__le64 start_block;
__le32 size;
unsigned int unused;
};
struct squashfs_xattr_entry {
__le16 type;
__le16 size;
char data[0];
};
struct squashfs_xattr_val {
__le32 vsize;
char value[0];
};
struct squashfs_xattr_id {
__le64 xattr;
__le32 count;
__le32 size;
};
struct squashfs_xattr_id_table {
__le64 xattr_table_start;
__le32 xattr_ids;
__le32 unused;
};
#endif
|