1
2#ifndef SQUASHFS_FS
3#define SQUASHFS_FS
4
5
6
7
8
9
10
11
12
13#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
14#define SQUASHFS_MAJOR 4
15#define SQUASHFS_MINOR 0
16#define SQUASHFS_START 0
17
18
19#define SQUASHFS_METADATA_SIZE 8192
20#define SQUASHFS_BLOCK_OFFSET 2
21
22
23#ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
24#define SQUASHFS_DEVBLK_SIZE 4096
25#else
26#define SQUASHFS_DEVBLK_SIZE 1024
27#endif
28
29#define SQUASHFS_FILE_MAX_SIZE 1048576
30#define SQUASHFS_FILE_MAX_LOG 20
31
32
33#define SQUASHFS_NAME_LEN 256
34
35
36#define SQUASHFS_DIR_COUNT 256
37
38#define SQUASHFS_INVALID_FRAG (0xffffffffU)
39#define SQUASHFS_INVALID_XATTR (0xffffffffU)
40#define SQUASHFS_INVALID_BLK (-1LL)
41
42
43#define SQUASHFS_NOI 0
44#define SQUASHFS_NOD 1
45#define SQUASHFS_NOF 3
46#define SQUASHFS_NO_FRAG 4
47#define SQUASHFS_ALWAYS_FRAG 5
48#define SQUASHFS_DUPLICATE 6
49#define SQUASHFS_EXPORT 7
50#define SQUASHFS_COMP_OPT 10
51
52#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
53
54#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
55 SQUASHFS_NOI)
56
57#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
58 SQUASHFS_NOD)
59
60#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
61 SQUASHFS_NOF)
62
63#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
64 SQUASHFS_NO_FRAG)
65
66#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
67 SQUASHFS_ALWAYS_FRAG)
68
69#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
70 SQUASHFS_DUPLICATE)
71
72#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
73 SQUASHFS_EXPORT)
74
75#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
76 SQUASHFS_COMP_OPT)
77
78
79#define SQUASHFS_DIR_TYPE 1
80#define SQUASHFS_REG_TYPE 2
81#define SQUASHFS_SYMLINK_TYPE 3
82#define SQUASHFS_BLKDEV_TYPE 4
83#define SQUASHFS_CHRDEV_TYPE 5
84#define SQUASHFS_FIFO_TYPE 6
85#define SQUASHFS_SOCKET_TYPE 7
86#define SQUASHFS_LDIR_TYPE 8
87#define SQUASHFS_LREG_TYPE 9
88#define SQUASHFS_LSYMLINK_TYPE 10
89#define SQUASHFS_LBLKDEV_TYPE 11
90#define SQUASHFS_LCHRDEV_TYPE 12
91#define SQUASHFS_LFIFO_TYPE 13
92#define SQUASHFS_LSOCKET_TYPE 14
93
94
95#define SQUASHFS_MAX_DIR_TYPE 7
96
97
98#define SQUASHFS_XATTR_USER 0
99#define SQUASHFS_XATTR_TRUSTED 1
100#define SQUASHFS_XATTR_SECURITY 2
101#define SQUASHFS_XATTR_VALUE_OOL 256
102#define SQUASHFS_XATTR_PREFIX_MASK 0xff
103
104
105
106#define SQUASHFS_COMPRESSED_BIT (1 << 15)
107
108#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
109 (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
110
111#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
112
113#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
114
115#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
116 ~SQUASHFS_COMPRESSED_BIT_BLOCK)
117
118#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
119
120static inline int squashfs_block_size(__le32 raw)
121{
122 u32 size = le32_to_cpu(raw);
123 return (size >> 25) ? -EIO : size;
124}
125
126
127
128
129
130#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
131
132#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
133
134#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
135 << 16) + (B)))
136
137
138#define SQUASHFS_FRAGMENT_BYTES(A) \
139 ((A) * sizeof(struct squashfs_fragment_entry))
140
141#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
142 SQUASHFS_METADATA_SIZE)
143
144#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
145 SQUASHFS_METADATA_SIZE)
146
147#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
148 SQUASHFS_METADATA_SIZE - 1) / \
149 SQUASHFS_METADATA_SIZE)
150
151#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
152 sizeof(u64))
153
154
155#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
156
157#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
158 SQUASHFS_METADATA_SIZE)
159
160#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
161 SQUASHFS_METADATA_SIZE)
162
163#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
164 SQUASHFS_METADATA_SIZE - 1) / \
165 SQUASHFS_METADATA_SIZE)
166
167#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
168 sizeof(u64))
169
170
171#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
172
173#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
174 SQUASHFS_METADATA_SIZE)
175
176#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
177 SQUASHFS_METADATA_SIZE)
178
179#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
180 SQUASHFS_METADATA_SIZE - 1) / \
181 SQUASHFS_METADATA_SIZE)
182
183#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
184 sizeof(u64))
185
186#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
187
188#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
189 SQUASHFS_METADATA_SIZE)
190
191#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
192 SQUASHFS_METADATA_SIZE)
193
194#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
195 SQUASHFS_METADATA_SIZE - 1) / \
196 SQUASHFS_METADATA_SIZE)
197
198#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
199 sizeof(u64))
200#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
201
202#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
203
204
205#define SQUASHFS_CACHED_BLKS 8
206
207
208#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
209#define SQUASHFS_META_ENTRIES 127
210#define SQUASHFS_META_SLOTS 8
211
212struct meta_entry {
213 u64 data_block;
214 unsigned int index_block;
215 unsigned short offset;
216 unsigned short pad;
217};
218
219struct meta_index {
220 unsigned int inode_number;
221 unsigned int offset;
222 unsigned short entries;
223 unsigned short skip;
224 unsigned short locked;
225 unsigned short pad;
226 struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
227};
228
229
230
231
232
233#define ZLIB_COMPRESSION 1
234#define LZMA_COMPRESSION 2
235#define LZO_COMPRESSION 3
236#define XZ_COMPRESSION 4
237#define LZ4_COMPRESSION 5
238#define ZSTD_COMPRESSION 6
239
240struct squashfs_super_block {
241 __le32 s_magic;
242 __le32 inodes;
243 __le32 mkfs_time;
244 __le32 block_size;
245 __le32 fragments;
246 __le16 compression;
247 __le16 block_log;
248 __le16 flags;
249 __le16 no_ids;
250 __le16 s_major;
251 __le16 s_minor;
252 __le64 root_inode;
253 __le64 bytes_used;
254 __le64 id_table_start;
255 __le64 xattr_id_table_start;
256 __le64 inode_table_start;
257 __le64 directory_table_start;
258 __le64 fragment_table_start;
259 __le64 lookup_table_start;
260};
261
262struct squashfs_dir_index {
263 __le32 index;
264 __le32 start_block;
265 __le32 size;
266 unsigned char name[];
267};
268
269struct squashfs_base_inode {
270 __le16 inode_type;
271 __le16 mode;
272 __le16 uid;
273 __le16 guid;
274 __le32 mtime;
275 __le32 inode_number;
276};
277
278struct squashfs_ipc_inode {
279 __le16 inode_type;
280 __le16 mode;
281 __le16 uid;
282 __le16 guid;
283 __le32 mtime;
284 __le32 inode_number;
285 __le32 nlink;
286};
287
288struct squashfs_lipc_inode {
289 __le16 inode_type;
290 __le16 mode;
291 __le16 uid;
292 __le16 guid;
293 __le32 mtime;
294 __le32 inode_number;
295 __le32 nlink;
296 __le32 xattr;
297};
298
299struct squashfs_dev_inode {
300 __le16 inode_type;
301 __le16 mode;
302 __le16 uid;
303 __le16 guid;
304 __le32 mtime;
305 __le32 inode_number;
306 __le32 nlink;
307 __le32 rdev;
308};
309
310struct squashfs_ldev_inode {
311 __le16 inode_type;
312 __le16 mode;
313 __le16 uid;
314 __le16 guid;
315 __le32 mtime;
316 __le32 inode_number;
317 __le32 nlink;
318 __le32 rdev;
319 __le32 xattr;
320};
321
322struct squashfs_symlink_inode {
323 __le16 inode_type;
324 __le16 mode;
325 __le16 uid;
326 __le16 guid;
327 __le32 mtime;
328 __le32 inode_number;
329 __le32 nlink;
330 __le32 symlink_size;
331 char symlink[];
332};
333
334struct squashfs_reg_inode {
335 __le16 inode_type;
336 __le16 mode;
337 __le16 uid;
338 __le16 guid;
339 __le32 mtime;
340 __le32 inode_number;
341 __le32 start_block;
342 __le32 fragment;
343 __le32 offset;
344 __le32 file_size;
345 __le16 block_list[];
346};
347
348struct squashfs_lreg_inode {
349 __le16 inode_type;
350 __le16 mode;
351 __le16 uid;
352 __le16 guid;
353 __le32 mtime;
354 __le32 inode_number;
355 __le64 start_block;
356 __le64 file_size;
357 __le64 sparse;
358 __le32 nlink;
359 __le32 fragment;
360 __le32 offset;
361 __le32 xattr;
362 __le16 block_list[];
363};
364
365struct squashfs_dir_inode {
366 __le16 inode_type;
367 __le16 mode;
368 __le16 uid;
369 __le16 guid;
370 __le32 mtime;
371 __le32 inode_number;
372 __le32 start_block;
373 __le32 nlink;
374 __le16 file_size;
375 __le16 offset;
376 __le32 parent_inode;
377};
378
379struct squashfs_ldir_inode {
380 __le16 inode_type;
381 __le16 mode;
382 __le16 uid;
383 __le16 guid;
384 __le32 mtime;
385 __le32 inode_number;
386 __le32 nlink;
387 __le32 file_size;
388 __le32 start_block;
389 __le32 parent_inode;
390 __le16 i_count;
391 __le16 offset;
392 __le32 xattr;
393 struct squashfs_dir_index index[];
394};
395
396union squashfs_inode {
397 struct squashfs_base_inode base;
398 struct squashfs_dev_inode dev;
399 struct squashfs_ldev_inode ldev;
400 struct squashfs_symlink_inode symlink;
401 struct squashfs_reg_inode reg;
402 struct squashfs_lreg_inode lreg;
403 struct squashfs_dir_inode dir;
404 struct squashfs_ldir_inode ldir;
405 struct squashfs_ipc_inode ipc;
406 struct squashfs_lipc_inode lipc;
407};
408
409struct squashfs_dir_entry {
410 __le16 offset;
411 __le16 inode_number;
412 __le16 type;
413 __le16 size;
414 char name[];
415};
416
417struct squashfs_dir_header {
418 __le32 count;
419 __le32 start_block;
420 __le32 inode_number;
421};
422
423struct squashfs_fragment_entry {
424 __le64 start_block;
425 __le32 size;
426 unsigned int unused;
427};
428
429struct squashfs_xattr_entry {
430 __le16 type;
431 __le16 size;
432 char data[];
433};
434
435struct squashfs_xattr_val {
436 __le32 vsize;
437 char value[];
438};
439
440struct squashfs_xattr_id {
441 __le64 xattr;
442 __le32 count;
443 __le32 size;
444};
445
446struct squashfs_xattr_id_table {
447 __le64 xattr_table_start;
448 __le32 xattr_ids;
449 __le32 unused;
450};
451
452#endif
453
