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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#define SQUASHFS_METADATA_LOG 13
34
35/* default size of data blocks */
36#define SQUASHFS_FILE_SIZE 131072
37#define SQUASHFS_FILE_LOG 17
38
39#define SQUASHFS_FILE_MAX_SIZE 1048576
40#define SQUASHFS_FILE_MAX_LOG 20
41
42/* Max number of uids and gids */
43#define SQUASHFS_IDS 65536
44
45/* Max length of filename (not 255) */
46#define SQUASHFS_NAME_LEN 256
47
48#define SQUASHFS_INVALID_FRAG (0xffffffffU)
49#define SQUASHFS_INVALID_XATTR (0xffffffffU)
50#define SQUASHFS_INVALID_BLK (-1LL)
51
52/* Filesystem flags */
53#define SQUASHFS_NOI 0
54#define SQUASHFS_NOD 1
55#define SQUASHFS_NOF 3
56#define SQUASHFS_NO_FRAG 4
57#define SQUASHFS_ALWAYS_FRAG 5
58#define SQUASHFS_DUPLICATE 6
59#define SQUASHFS_EXPORT 7
60#define SQUASHFS_COMP_OPT 10
61
62#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
63
64#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
65 SQUASHFS_NOI)
66
67#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
68 SQUASHFS_NOD)
69
70#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
71 SQUASHFS_NOF)
72
73#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
74 SQUASHFS_NO_FRAG)
75
76#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
77 SQUASHFS_ALWAYS_FRAG)
78
79#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
80 SQUASHFS_DUPLICATE)
81
82#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
83 SQUASHFS_EXPORT)
84
85#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
86 SQUASHFS_COMP_OPT)
87
88/* Max number of types and file types */
89#define SQUASHFS_DIR_TYPE 1
90#define SQUASHFS_REG_TYPE 2
91#define SQUASHFS_SYMLINK_TYPE 3
92#define SQUASHFS_BLKDEV_TYPE 4
93#define SQUASHFS_CHRDEV_TYPE 5
94#define SQUASHFS_FIFO_TYPE 6
95#define SQUASHFS_SOCKET_TYPE 7
96#define SQUASHFS_LDIR_TYPE 8
97#define SQUASHFS_LREG_TYPE 9
98#define SQUASHFS_LSYMLINK_TYPE 10
99#define SQUASHFS_LBLKDEV_TYPE 11
100#define SQUASHFS_LCHRDEV_TYPE 12
101#define SQUASHFS_LFIFO_TYPE 13
102#define SQUASHFS_LSOCKET_TYPE 14
103
104/* Xattr types */
105#define SQUASHFS_XATTR_USER 0
106#define SQUASHFS_XATTR_TRUSTED 1
107#define SQUASHFS_XATTR_SECURITY 2
108#define SQUASHFS_XATTR_VALUE_OOL 256
109#define SQUASHFS_XATTR_PREFIX_MASK 0xff
110
111/* Flag whether block is compressed or uncompressed, bit is set if block is
112 * uncompressed */
113#define SQUASHFS_COMPRESSED_BIT (1 << 15)
114
115#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
116 (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
117
118#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
119
120#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
121
122#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
123 ~SQUASHFS_COMPRESSED_BIT_BLOCK)
124
125#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
126
127/*
128 * Inode number ops. Inodes consist of a compressed block number, and an
129 * uncompressed offset within that block
130 */
131#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
132
133#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
134
135#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
136 << 16) + (B)))
137
138/* Translate between VFS mode and squashfs mode */
139#define SQUASHFS_MODE(A) ((A) & 0xfff)
140
141/* fragment and fragment table defines */
142#define SQUASHFS_FRAGMENT_BYTES(A) \
143 ((A) * sizeof(struct squashfs_fragment_entry))
144
145#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
146 SQUASHFS_METADATA_SIZE)
147
148#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
149 SQUASHFS_METADATA_SIZE)
150
151#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
152 SQUASHFS_METADATA_SIZE - 1) / \
153 SQUASHFS_METADATA_SIZE)
154
155#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
156 sizeof(u64))
157
158/* inode lookup table defines */
159#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
160
161#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
162 SQUASHFS_METADATA_SIZE)
163
164#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
165 SQUASHFS_METADATA_SIZE)
166
167#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
168 SQUASHFS_METADATA_SIZE - 1) / \
169 SQUASHFS_METADATA_SIZE)
170
171#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
172 sizeof(u64))
173
174/* uid/gid lookup table defines */
175#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
176
177#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
178 SQUASHFS_METADATA_SIZE)
179
180#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
181 SQUASHFS_METADATA_SIZE)
182
183#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
184 SQUASHFS_METADATA_SIZE - 1) / \
185 SQUASHFS_METADATA_SIZE)
186
187#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
188 sizeof(u64))
189/* xattr id lookup table defines */
190#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
191
192#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
193 SQUASHFS_METADATA_SIZE)
194
195#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
196 SQUASHFS_METADATA_SIZE)
197
198#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
199 SQUASHFS_METADATA_SIZE - 1) / \
200 SQUASHFS_METADATA_SIZE)
201
202#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
203 sizeof(u64))
204#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
205
206#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
207
208/* cached data constants for filesystem */
209#define SQUASHFS_CACHED_BLKS 8
210
211#define SQUASHFS_MAX_FILE_SIZE_LOG 64
212
213#define SQUASHFS_MAX_FILE_SIZE (1LL << \
214 (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
215
216/* meta index cache */
217#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
218#define SQUASHFS_META_ENTRIES 127
219#define SQUASHFS_META_SLOTS 8
220
221struct meta_entry {
222 u64 data_block;
223 unsigned int index_block;
224 unsigned short offset;
225 unsigned short pad;
226};
227
228struct meta_index {
229 unsigned int inode_number;
230 unsigned int offset;
231 unsigned short entries;
232 unsigned short skip;
233 unsigned short locked;
234 unsigned short pad;
235 struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
236};
237
238
239/*
240 * definitions for structures on disk
241 */
242#define ZLIB_COMPRESSION 1
243#define LZMA_COMPRESSION 2
244#define LZO_COMPRESSION 3
245#define XZ_COMPRESSION 4
246
247struct squashfs_super_block {
248 __le32 s_magic;
249 __le32 inodes;
250 __le32 mkfs_time;
251 __le32 block_size;
252 __le32 fragments;
253 __le16 compression;
254 __le16 block_log;
255 __le16 flags;
256 __le16 no_ids;
257 __le16 s_major;
258 __le16 s_minor;
259 __le64 root_inode;
260 __le64 bytes_used;
261 __le64 id_table_start;
262 __le64 xattr_id_table_start;
263 __le64 inode_table_start;
264 __le64 directory_table_start;
265 __le64 fragment_table_start;
266 __le64 lookup_table_start;
267};
268
269struct squashfs_dir_index {
270 __le32 index;
271 __le32 start_block;
272 __le32 size;
273 unsigned char name[0];
274};
275
276struct squashfs_base_inode {
277 __le16 inode_type;
278 __le16 mode;
279 __le16 uid;
280 __le16 guid;
281 __le32 mtime;
282 __le32 inode_number;
283};
284
285struct squashfs_ipc_inode {
286 __le16 inode_type;
287 __le16 mode;
288 __le16 uid;
289 __le16 guid;
290 __le32 mtime;
291 __le32 inode_number;
292 __le32 nlink;
293};
294
295struct squashfs_lipc_inode {
296 __le16 inode_type;
297 __le16 mode;
298 __le16 uid;
299 __le16 guid;
300 __le32 mtime;
301 __le32 inode_number;
302 __le32 nlink;
303 __le32 xattr;
304};
305
306struct squashfs_dev_inode {
307 __le16 inode_type;
308 __le16 mode;
309 __le16 uid;
310 __le16 guid;
311 __le32 mtime;
312 __le32 inode_number;
313 __le32 nlink;
314 __le32 rdev;
315};
316
317struct squashfs_ldev_inode {
318 __le16 inode_type;
319 __le16 mode;
320 __le16 uid;
321 __le16 guid;
322 __le32 mtime;
323 __le32 inode_number;
324 __le32 nlink;
325 __le32 rdev;
326 __le32 xattr;
327};
328
329struct squashfs_symlink_inode {
330 __le16 inode_type;
331 __le16 mode;
332 __le16 uid;
333 __le16 guid;
334 __le32 mtime;
335 __le32 inode_number;
336 __le32 nlink;
337 __le32 symlink_size;
338 char symlink[0];
339};
340
341struct squashfs_reg_inode {
342 __le16 inode_type;
343 __le16 mode;
344 __le16 uid;
345 __le16 guid;
346 __le32 mtime;
347 __le32 inode_number;
348 __le32 start_block;
349 __le32 fragment;
350 __le32 offset;
351 __le32 file_size;
352 __le16 block_list[0];
353};
354
355struct squashfs_lreg_inode {
356 __le16 inode_type;
357 __le16 mode;
358 __le16 uid;
359 __le16 guid;
360 __le32 mtime;
361 __le32 inode_number;
362 __le64 start_block;
363 __le64 file_size;
364 __le64 sparse;
365 __le32 nlink;
366 __le32 fragment;
367 __le32 offset;
368 __le32 xattr;
369 __le16 block_list[0];
370};
371
372struct squashfs_dir_inode {
373 __le16 inode_type;
374 __le16 mode;
375 __le16 uid;
376 __le16 guid;
377 __le32 mtime;
378 __le32 inode_number;
379 __le32 start_block;
380 __le32 nlink;
381 __le16 file_size;
382 __le16 offset;
383 __le32 parent_inode;
384};
385
386struct squashfs_ldir_inode {
387 __le16 inode_type;
388 __le16 mode;
389 __le16 uid;
390 __le16 guid;
391 __le32 mtime;
392 __le32 inode_number;
393 __le32 nlink;
394 __le32 file_size;
395 __le32 start_block;
396 __le32 parent_inode;
397 __le16 i_count;
398 __le16 offset;
399 __le32 xattr;
400 struct squashfs_dir_index index[0];
401};
402
403union squashfs_inode {
404 struct squashfs_base_inode base;
405 struct squashfs_dev_inode dev;
406 struct squashfs_ldev_inode ldev;
407 struct squashfs_symlink_inode symlink;
408 struct squashfs_reg_inode reg;
409 struct squashfs_lreg_inode lreg;
410 struct squashfs_dir_inode dir;
411 struct squashfs_ldir_inode ldir;
412 struct squashfs_ipc_inode ipc;
413 struct squashfs_lipc_inode lipc;
414};
415
416struct squashfs_dir_entry {
417 __le16 offset;
418 __le16 inode_number;
419 __le16 type;
420 __le16 size;
421 char name[0];
422};
423
424struct squashfs_dir_header {
425 __le32 count;
426 __le32 start_block;
427 __le32 inode_number;
428};
429
430struct squashfs_fragment_entry {
431 __le64 start_block;
432 __le32 size;
433 unsigned int unused;
434};
435
436struct squashfs_xattr_entry {
437 __le16 type;
438 __le16 size;
439 char data[0];
440};
441
442struct squashfs_xattr_val {
443 __le32 vsize;
444 char value[0];
445};
446
447struct squashfs_xattr_id {
448 __le64 xattr;
449 __le32 count;
450 __le32 size;
451};
452
453struct squashfs_xattr_id_table {
454 __le64 xattr_table_start;
455 __le32 xattr_ids;
456 __le32 unused;
457};
458
459#endif
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
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 * 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
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 * 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
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