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merge path_init and path_init_rcu
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / squashfs / squashfs_fs.h
blob39533feffd6d3a3e02d8a5ceeb5f37c93587c656
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@lougher.demon.co.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
61 #define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
62
63 #define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
64 SQUASHFS_NOI)
65
66 #define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
67 SQUASHFS_NOD)
68
69 #define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
70 SQUASHFS_NOF)
71
72 #define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
73 SQUASHFS_NO_FRAG)
74
75 #define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
76 SQUASHFS_ALWAYS_FRAG)
77
78 #define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
79 SQUASHFS_DUPLICATE)
80
81 #define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
82 SQUASHFS_EXPORT)
83
84 /* Max number of types and file types */
85 #define SQUASHFS_DIR_TYPE 1
86 #define SQUASHFS_REG_TYPE 2
87 #define SQUASHFS_SYMLINK_TYPE 3
88 #define SQUASHFS_BLKDEV_TYPE 4
89 #define SQUASHFS_CHRDEV_TYPE 5
90 #define SQUASHFS_FIFO_TYPE 6
91 #define SQUASHFS_SOCKET_TYPE 7
92 #define SQUASHFS_LDIR_TYPE 8
93 #define SQUASHFS_LREG_TYPE 9
94 #define SQUASHFS_LSYMLINK_TYPE 10
95 #define SQUASHFS_LBLKDEV_TYPE 11
96 #define SQUASHFS_LCHRDEV_TYPE 12
97 #define SQUASHFS_LFIFO_TYPE 13
98 #define SQUASHFS_LSOCKET_TYPE 14
99
100 /* Xattr types */
101 #define SQUASHFS_XATTR_USER 0
102 #define SQUASHFS_XATTR_TRUSTED 1
103 #define SQUASHFS_XATTR_SECURITY 2
104 #define SQUASHFS_XATTR_VALUE_OOL 256
105 #define SQUASHFS_XATTR_PREFIX_MASK 0xff
106
107 /* Flag whether block is compressed or uncompressed, bit is set if block is
108 * uncompressed */
109 #define SQUASHFS_COMPRESSED_BIT (1 << 15)
110
111 #define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
112 (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
113
114 #define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
115
116 #define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
117
118 #define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
119 ~SQUASHFS_COMPRESSED_BIT_BLOCK)
120
121 #define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
122
123 /*
124 * Inode number ops. Inodes consist of a compressed block number, and an
125 * uncompressed offset within that block
126 */
127 #define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
128
129 #define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
130
131 #define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
132 << 16) + (B)))
133
134 /* Translate between VFS mode and squashfs mode */
135 #define SQUASHFS_MODE(A) ((A) & 0xfff)
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) ((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 #define SQUASHFS_MAX_FILE_SIZE_LOG 64
208
209 #define SQUASHFS_MAX_FILE_SIZE (1LL << \
210 (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
211
212 /* meta index cache */
213 #define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
214 #define SQUASHFS_META_ENTRIES 127
215 #define SQUASHFS_META_SLOTS 8
216
217 struct meta_entry {
218 u64 data_block;
219 unsigned int index_block;
220 unsigned short offset;
221 unsigned short pad;
222 };
223
224 struct meta_index {
225 unsigned int inode_number;
226 unsigned int offset;
227 unsigned short entries;
228 unsigned short skip;
229 unsigned short locked;
230 unsigned short pad;
231 struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
232 };
233
234
235 /*
236 * definitions for structures on disk
237 */
238 #define ZLIB_COMPRESSION 1
239 #define LZMA_COMPRESSION 2
240 #define LZO_COMPRESSION 3
241 #define XZ_COMPRESSION 4
242
243 struct squashfs_super_block {
244 __le32 s_magic;
245 __le32 inodes;
246 __le32 mkfs_time;
247 __le32 block_size;
248 __le32 fragments;
249 __le16 compression;
250 __le16 block_log;
251 __le16 flags;
252 __le16 no_ids;
253 __le16 s_major;
254 __le16 s_minor;
255 __le64 root_inode;
256 __le64 bytes_used;
257 __le64 id_table_start;
258 __le64 xattr_id_table_start;
259 __le64 inode_table_start;
260 __le64 directory_table_start;
261 __le64 fragment_table_start;
262 __le64 lookup_table_start;
263 };
264
265 struct squashfs_dir_index {
266 __le32 index;
267 __le32 start_block;
268 __le32 size;
269 unsigned char name[0];
270 };
271
272 struct squashfs_base_inode {
273 __le16 inode_type;
274 __le16 mode;
275 __le16 uid;
276 __le16 guid;
277 __le32 mtime;
278 __le32 inode_number;
279 };
280
281 struct squashfs_ipc_inode {
282 __le16 inode_type;
283 __le16 mode;
284 __le16 uid;
285 __le16 guid;
286 __le32 mtime;
287 __le32 inode_number;
288 __le32 nlink;
289 };
290
291 struct squashfs_lipc_inode {
292 __le16 inode_type;
293 __le16 mode;
294 __le16 uid;
295 __le16 guid;
296 __le32 mtime;
297 __le32 inode_number;
298 __le32 nlink;
299 __le32 xattr;
300 };
301
302 struct squashfs_dev_inode {
303 __le16 inode_type;
304 __le16 mode;
305 __le16 uid;
306 __le16 guid;
307 __le32 mtime;
308 __le32 inode_number;
309 __le32 nlink;
310 __le32 rdev;
311 };
312
313 struct squashfs_ldev_inode {
314 __le16 inode_type;
315 __le16 mode;
316 __le16 uid;
317 __le16 guid;
318 __le32 mtime;
319 __le32 inode_number;
320 __le32 nlink;
321 __le32 rdev;
322 __le32 xattr;
323 };
324
325 struct squashfs_symlink_inode {
326 __le16 inode_type;
327 __le16 mode;
328 __le16 uid;
329 __le16 guid;
330 __le32 mtime;
331 __le32 inode_number;
332 __le32 nlink;
333 __le32 symlink_size;
334 char symlink[0];
335 };
336
337 struct squashfs_reg_inode {
338 __le16 inode_type;
339 __le16 mode;
340 __le16 uid;
341 __le16 guid;
342 __le32 mtime;
343 __le32 inode_number;
344 __le32 start_block;
345 __le32 fragment;
346 __le32 offset;
347 __le32 file_size;
348 __le16 block_list[0];
349 };
350
351 struct squashfs_lreg_inode {
352 __le16 inode_type;
353 __le16 mode;
354 __le16 uid;
355 __le16 guid;
356 __le32 mtime;
357 __le32 inode_number;
358 __le64 start_block;
359 __le64 file_size;
360 __le64 sparse;
361 __le32 nlink;
362 __le32 fragment;
363 __le32 offset;
364 __le32 xattr;
365 __le16 block_list[0];
366 };
367
368 struct squashfs_dir_inode {
369 __le16 inode_type;
370 __le16 mode;
371 __le16 uid;
372 __le16 guid;
373 __le32 mtime;
374 __le32 inode_number;
375 __le32 start_block;
376 __le32 nlink;
377 __le16 file_size;
378 __le16 offset;
379 __le32 parent_inode;
380 };
381
382 struct squashfs_ldir_inode {
383 __le16 inode_type;
384 __le16 mode;
385 __le16 uid;
386 __le16 guid;
387 __le32 mtime;
388 __le32 inode_number;
389 __le32 nlink;
390 __le32 file_size;
391 __le32 start_block;
392 __le32 parent_inode;
393 __le16 i_count;
394 __le16 offset;
395 __le32 xattr;
396 struct squashfs_dir_index index[0];
397 };
398
399 union squashfs_inode {
400 struct squashfs_base_inode base;
401 struct squashfs_dev_inode dev;
402 struct squashfs_ldev_inode ldev;
403 struct squashfs_symlink_inode symlink;
404 struct squashfs_reg_inode reg;
405 struct squashfs_lreg_inode lreg;
406 struct squashfs_dir_inode dir;
407 struct squashfs_ldir_inode ldir;
408 struct squashfs_ipc_inode ipc;
409 struct squashfs_lipc_inode lipc;
410 };
411
412 struct squashfs_dir_entry {
413 __le16 offset;
414 __le16 inode_number;
415 __le16 type;
416 __le16 size;
417 char name[0];
418 };
419
420 struct squashfs_dir_header {
421 __le32 count;
422 __le32 start_block;
423 __le32 inode_number;
424 };
425
426 struct squashfs_fragment_entry {
427 __le64 start_block;
428 __le32 size;
429 unsigned int unused;
430 };
431
432 struct squashfs_xattr_entry {
433 __le16 type;
434 __le16 size;
435 char data[0];
436 };
437
438 struct squashfs_xattr_val {
439 __le32 vsize;
440 char value[0];
441 };
442
443 struct squashfs_xattr_id {
444 __le64 xattr;
445 __le32 count;
446 __le32 size;
447 };
448
449 struct squashfs_xattr_id_table {
450 __le64 xattr_table_start;
451 __le32 xattr_ids;
452 __le32 unused;
453 };
454
455 #endif
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