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Linux kernel mirror (for testing)
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linux
1#ifndef SQUASHFS_FS
2#define SQUASHFS_FS
3/*
4 * Squashfs
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
7 * Phillip Lougher <phillip@squashfs.org.uk>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2,
12 * or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 *
23 * squashfs_fs.h
24 */
25
26#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
27#define SQUASHFS_MAJOR 4
28#define SQUASHFS_MINOR 0
29#define SQUASHFS_START 0
30
31/* size of metadata (inode and directory) blocks */
32#define SQUASHFS_METADATA_SIZE 8192
33
34/* default size of block device I/O */
35#ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
36#define SQUASHFS_DEVBLK_SIZE 4096
37#else
38#define SQUASHFS_DEVBLK_SIZE 1024
39#endif
40
41#define SQUASHFS_FILE_MAX_SIZE 1048576
42#define SQUASHFS_FILE_MAX_LOG 20
43
44/* Max length of filename (not 255) */
45#define SQUASHFS_NAME_LEN 256
46
47/* Max value for directory header count*/
48#define SQUASHFS_DIR_COUNT 256
49
50#define SQUASHFS_INVALID_FRAG (0xffffffffU)
51#define SQUASHFS_INVALID_XATTR (0xffffffffU)
52#define SQUASHFS_INVALID_BLK (-1LL)
53
54/* Filesystem flags */
55#define SQUASHFS_NOI 0
56#define SQUASHFS_NOD 1
57#define SQUASHFS_NOF 3
58#define SQUASHFS_NO_FRAG 4
59#define SQUASHFS_ALWAYS_FRAG 5
60#define SQUASHFS_DUPLICATE 6
61#define SQUASHFS_EXPORT 7
62#define SQUASHFS_COMP_OPT 10
63
64#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
65
66#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
67 SQUASHFS_NOI)
68
69#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
70 SQUASHFS_NOD)
71
72#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
73 SQUASHFS_NOF)
74
75#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
76 SQUASHFS_NO_FRAG)
77
78#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
79 SQUASHFS_ALWAYS_FRAG)
80
81#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
82 SQUASHFS_DUPLICATE)
83
84#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
85 SQUASHFS_EXPORT)
86
87#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
88 SQUASHFS_COMP_OPT)
89
90/* Inode types including extended types */
91#define SQUASHFS_DIR_TYPE 1
92#define SQUASHFS_REG_TYPE 2
93#define SQUASHFS_SYMLINK_TYPE 3
94#define SQUASHFS_BLKDEV_TYPE 4
95#define SQUASHFS_CHRDEV_TYPE 5
96#define SQUASHFS_FIFO_TYPE 6
97#define SQUASHFS_SOCKET_TYPE 7
98#define SQUASHFS_LDIR_TYPE 8
99#define SQUASHFS_LREG_TYPE 9
100#define SQUASHFS_LSYMLINK_TYPE 10
101#define SQUASHFS_LBLKDEV_TYPE 11
102#define SQUASHFS_LCHRDEV_TYPE 12
103#define SQUASHFS_LFIFO_TYPE 13
104#define SQUASHFS_LSOCKET_TYPE 14
105
106/* Max type value stored in directory entry */
107#define SQUASHFS_MAX_DIR_TYPE 7
108
109/* Xattr types */
110#define SQUASHFS_XATTR_USER 0
111#define SQUASHFS_XATTR_TRUSTED 1
112#define SQUASHFS_XATTR_SECURITY 2
113#define SQUASHFS_XATTR_VALUE_OOL 256
114#define SQUASHFS_XATTR_PREFIX_MASK 0xff
115
116/* Flag whether block is compressed or uncompressed, bit is set if block is
117 * uncompressed */
118#define SQUASHFS_COMPRESSED_BIT (1 << 15)
119
120#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
121 (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
122
123#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
124
125#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
126
127#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
128 ~SQUASHFS_COMPRESSED_BIT_BLOCK)
129
130#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
131
132static inline int squashfs_block_size(__le32 raw)
133{
134 u32 size = le32_to_cpu(raw);
135 return (size >> 25) ? -EIO : size;
136}
137
138/*
139 * Inode number ops. Inodes consist of a compressed block number, and an
140 * uncompressed offset within that block
141 */
142#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
143
144#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
145
146#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
147 << 16) + (B)))
148
149/* fragment and fragment table defines */
150#define SQUASHFS_FRAGMENT_BYTES(A) \
151 ((A) * sizeof(struct squashfs_fragment_entry))
152
153#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
154 SQUASHFS_METADATA_SIZE)
155
156#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
157 SQUASHFS_METADATA_SIZE)
158
159#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
160 SQUASHFS_METADATA_SIZE - 1) / \
161 SQUASHFS_METADATA_SIZE)
162
163#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
164 sizeof(u64))
165
166/* inode lookup table defines */
167#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
168
169#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
170 SQUASHFS_METADATA_SIZE)
171
172#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
173 SQUASHFS_METADATA_SIZE)
174
175#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
176 SQUASHFS_METADATA_SIZE - 1) / \
177 SQUASHFS_METADATA_SIZE)
178
179#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
180 sizeof(u64))
181
182/* uid/gid lookup table defines */
183#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
184
185#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
186 SQUASHFS_METADATA_SIZE)
187
188#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
189 SQUASHFS_METADATA_SIZE)
190
191#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
192 SQUASHFS_METADATA_SIZE - 1) / \
193 SQUASHFS_METADATA_SIZE)
194
195#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
196 sizeof(u64))
197/* xattr id lookup table defines */
198#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
199
200#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
201 SQUASHFS_METADATA_SIZE)
202
203#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
204 SQUASHFS_METADATA_SIZE)
205
206#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
207 SQUASHFS_METADATA_SIZE - 1) / \
208 SQUASHFS_METADATA_SIZE)
209
210#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
211 sizeof(u64))
212#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
213
214#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
215
216/* cached data constants for filesystem */
217#define SQUASHFS_CACHED_BLKS 8
218
219/* meta index cache */
220#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
221#define SQUASHFS_META_ENTRIES 127
222#define SQUASHFS_META_SLOTS 8
223
224struct meta_entry {
225 u64 data_block;
226 unsigned int index_block;
227 unsigned short offset;
228 unsigned short pad;
229};
230
231struct meta_index {
232 unsigned int inode_number;
233 unsigned int offset;
234 unsigned short entries;
235 unsigned short skip;
236 unsigned short locked;
237 unsigned short pad;
238 struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
239};
240
241
242/*
243 * definitions for structures on disk
244 */
245#define ZLIB_COMPRESSION 1
246#define LZMA_COMPRESSION 2
247#define LZO_COMPRESSION 3
248#define XZ_COMPRESSION 4
249#define LZ4_COMPRESSION 5
250#define ZSTD_COMPRESSION 6
251
252struct squashfs_super_block {
253 __le32 s_magic;
254 __le32 inodes;
255 __le32 mkfs_time;
256 __le32 block_size;
257 __le32 fragments;
258 __le16 compression;
259 __le16 block_log;
260 __le16 flags;
261 __le16 no_ids;
262 __le16 s_major;
263 __le16 s_minor;
264 __le64 root_inode;
265 __le64 bytes_used;
266 __le64 id_table_start;
267 __le64 xattr_id_table_start;
268 __le64 inode_table_start;
269 __le64 directory_table_start;
270 __le64 fragment_table_start;
271 __le64 lookup_table_start;
272};
273
274struct squashfs_dir_index {
275 __le32 index;
276 __le32 start_block;
277 __le32 size;
278 unsigned char name[0];
279};
280
281struct squashfs_base_inode {
282 __le16 inode_type;
283 __le16 mode;
284 __le16 uid;
285 __le16 guid;
286 __le32 mtime;
287 __le32 inode_number;
288};
289
290struct squashfs_ipc_inode {
291 __le16 inode_type;
292 __le16 mode;
293 __le16 uid;
294 __le16 guid;
295 __le32 mtime;
296 __le32 inode_number;
297 __le32 nlink;
298};
299
300struct squashfs_lipc_inode {
301 __le16 inode_type;
302 __le16 mode;
303 __le16 uid;
304 __le16 guid;
305 __le32 mtime;
306 __le32 inode_number;
307 __le32 nlink;
308 __le32 xattr;
309};
310
311struct squashfs_dev_inode {
312 __le16 inode_type;
313 __le16 mode;
314 __le16 uid;
315 __le16 guid;
316 __le32 mtime;
317 __le32 inode_number;
318 __le32 nlink;
319 __le32 rdev;
320};
321
322struct squashfs_ldev_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 rdev;
331 __le32 xattr;
332};
333
334struct squashfs_symlink_inode {
335 __le16 inode_type;
336 __le16 mode;
337 __le16 uid;
338 __le16 guid;
339 __le32 mtime;
340 __le32 inode_number;
341 __le32 nlink;
342 __le32 symlink_size;
343 char symlink[0];
344};
345
346struct squashfs_reg_inode {
347 __le16 inode_type;
348 __le16 mode;
349 __le16 uid;
350 __le16 guid;
351 __le32 mtime;
352 __le32 inode_number;
353 __le32 start_block;
354 __le32 fragment;
355 __le32 offset;
356 __le32 file_size;
357 __le16 block_list[0];
358};
359
360struct squashfs_lreg_inode {
361 __le16 inode_type;
362 __le16 mode;
363 __le16 uid;
364 __le16 guid;
365 __le32 mtime;
366 __le32 inode_number;
367 __le64 start_block;
368 __le64 file_size;
369 __le64 sparse;
370 __le32 nlink;
371 __le32 fragment;
372 __le32 offset;
373 __le32 xattr;
374 __le16 block_list[0];
375};
376
377struct squashfs_dir_inode {
378 __le16 inode_type;
379 __le16 mode;
380 __le16 uid;
381 __le16 guid;
382 __le32 mtime;
383 __le32 inode_number;
384 __le32 start_block;
385 __le32 nlink;
386 __le16 file_size;
387 __le16 offset;
388 __le32 parent_inode;
389};
390
391struct squashfs_ldir_inode {
392 __le16 inode_type;
393 __le16 mode;
394 __le16 uid;
395 __le16 guid;
396 __le32 mtime;
397 __le32 inode_number;
398 __le32 nlink;
399 __le32 file_size;
400 __le32 start_block;
401 __le32 parent_inode;
402 __le16 i_count;
403 __le16 offset;
404 __le32 xattr;
405 struct squashfs_dir_index index[0];
406};
407
408union squashfs_inode {
409 struct squashfs_base_inode base;
410 struct squashfs_dev_inode dev;
411 struct squashfs_ldev_inode ldev;
412 struct squashfs_symlink_inode symlink;
413 struct squashfs_reg_inode reg;
414 struct squashfs_lreg_inode lreg;
415 struct squashfs_dir_inode dir;
416 struct squashfs_ldir_inode ldir;
417 struct squashfs_ipc_inode ipc;
418 struct squashfs_lipc_inode lipc;
419};
420
421struct squashfs_dir_entry {
422 __le16 offset;
423 __le16 inode_number;
424 __le16 type;
425 __le16 size;
426 char name[0];
427};
428
429struct squashfs_dir_header {
430 __le32 count;
431 __le32 start_block;
432 __le32 inode_number;
433};
434
435struct squashfs_fragment_entry {
436 __le64 start_block;
437 __le32 size;
438 unsigned int unused;
439};
440
441struct squashfs_xattr_entry {
442 __le16 type;
443 __le16 size;
444 char data[0];
445};
446
447struct squashfs_xattr_val {
448 __le32 vsize;
449 char value[0];
450};
451
452struct squashfs_xattr_id {
453 __le64 xattr;
454 __le32 count;
455 __le32 size;
456};
457
458struct squashfs_xattr_id_table {
459 __le64 xattr_table_start;
460 __le32 xattr_ids;
461 __le32 unused;
462};
463
464#endif