1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef SQUASHFS_FS
3 #define SQUASHFS_FS
4 /*
5 * Squashfs
6 *
7 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
8 * Phillip Lougher <phillip@squashfs.org.uk>
9 *
10 * squashfs_fs.h
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 /* size of metadata (inode and directory) blocks */
19 #define SQUASHFS_METADATA_SIZE 8192
20 #define SQUASHFS_BLOCK_OFFSET 2
21
22 /* default size of block device I/O */
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 /* Max length of filename (not 255) */
33 #define SQUASHFS_NAME_LEN 256
34
35 /* Max value for directory header count*/
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 /* Filesystem flags */
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 /* Inode types including extended types */
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 /* Max type value stored in directory entry */
95 #define SQUASHFS_MAX_DIR_TYPE 7
96
97 /* Xattr types */
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 /* Flag whether block is compressed or uncompressed, bit is set if block is
105 * uncompressed */
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
120 static 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 * Inode number ops. Inodes consist of a compressed block number, and an
128 * uncompressed offset within that block
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 /* fragment and fragment table defines */
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 /* inode lookup table defines */
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 /* uid/gid lookup table defines */
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 /* xattr id lookup table defines */
186 #define SQUASHFS_XATTR_BYTES(A) (((u64) (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 /* cached data constants for filesystem */
205 #define SQUASHFS_CACHED_BLKS 8
206
207 /* meta index cache */
208 #define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
209 #define SQUASHFS_META_ENTRIES 127
210 #define SQUASHFS_META_SLOTS 8
211
212 struct meta_entry {
213 u64 data_block;
214 unsigned int index_block;
215 unsigned short offset;
216 unsigned short pad;
217 };
218
219 struct 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 * definitions for structures on disk
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
240 struct 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
262 struct squashfs_dir_index {
263 __le32 index;
264 __le32 start_block;
265 __le32 size;
266 unsigned char name[];
267 };
268
269 struct 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
278 struct 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
288 struct 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
299 struct 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
310 struct 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
322 struct 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
334 struct 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
348 struct 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
365 struct 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
379 struct 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
396 union 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
409 struct squashfs_dir_entry {
410 __le16 offset;
411 __le16 inode_number;
412 __le16 type;
413 __le16 size;
414 char name[];
415 };
416
417 struct squashfs_dir_header {
418 __le32 count;
419 __le32 start_block;
420 __le32 inode_number;
421 };
422
423 struct squashfs_fragment_entry {
424 __le64 start_block;
425 __le32 size;
426 unsigned int unused;
427 };
428
429 struct squashfs_xattr_entry {
430 __le16 type;
431 __le16 size;
432 char data[];
433 };
434
435 struct squashfs_xattr_val {
436 __le32 vsize;
437 char value[];
438 };
439
440 struct squashfs_xattr_id {
441 __le64 xattr;
442 __le32 count;
443 __le32 size;
444 };
445
446 struct squashfs_xattr_id_table {
447 __le64 xattr_table_start;
448 __le32 xattr_ids;
449 __le32 unused;
450 };
451
452 #endif
453
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