Contents of /tags/mkinitrd-6_3_2/busybox/e2fsprogs/e2fs_defs.h
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 18560 byte(s)
tagged 'mkinitrd-6_3_2'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * linux/include/linux/ext2_fs.h |
4 | * |
5 | * Copyright (C) 1992, 1993, 1994, 1995 |
6 | * Remy Card (card@masi.ibp.fr) |
7 | * Laboratoire MASI - Institut Blaise Pascal |
8 | * Universite Pierre et Marie Curie (Paris VI) |
9 | * |
10 | * Copyright (C) 1991, 1992 Linus Torvalds |
11 | */ |
12 | |
13 | #ifndef LINUX_EXT2_FS_H |
14 | #define LINUX_EXT2_FS_H 1 |
15 | |
16 | /* |
17 | * Special inode numbers |
18 | */ |
19 | #define EXT2_BAD_INO 1 /* Bad blocks inode */ |
20 | #define EXT2_ROOT_INO 2 /* Root inode */ |
21 | #define EXT2_ACL_IDX_INO 3 /* ACL inode */ |
22 | #define EXT2_ACL_DATA_INO 4 /* ACL inode */ |
23 | #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ |
24 | #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
25 | #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ |
26 | #define EXT2_JOURNAL_INO 8 /* Journal inode */ |
27 | |
28 | /* First non-reserved inode for old ext2 filesystems */ |
29 | #define EXT2_GOOD_OLD_FIRST_INO 11 |
30 | |
31 | /* |
32 | * The second extended file system magic number |
33 | */ |
34 | #define EXT2_SUPER_MAGIC 0xEF53 |
35 | |
36 | /* Assume that user mode programs are passing in an ext2fs superblock, not |
37 | * a kernel struct super_block. This will allow us to call the feature-test |
38 | * macros from user land. */ |
39 | #define EXT2_SB(sb) (sb) |
40 | |
41 | /* |
42 | * Maximal count of links to a file |
43 | */ |
44 | #define EXT2_LINK_MAX 32000 |
45 | |
46 | /* |
47 | * Macro-instructions used to manage several block sizes |
48 | */ |
49 | #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ |
50 | #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ |
51 | #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) |
52 | #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) |
53 | #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
54 | #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
55 | #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ |
56 | EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) |
57 | #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ |
58 | EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) |
59 | #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t)) |
60 | |
61 | /* |
62 | * Macro-instructions used to manage fragments |
63 | */ |
64 | #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE |
65 | #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE |
66 | #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE |
67 | #define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) |
68 | #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) |
69 | |
70 | /* |
71 | * ACL structures |
72 | */ |
73 | struct ext2_acl_header { /* Header of Access Control Lists */ |
74 | uint32_t aclh_size; |
75 | uint32_t aclh_file_count; |
76 | uint32_t aclh_acle_count; |
77 | uint32_t aclh_first_acle; |
78 | }; |
79 | |
80 | struct ext2_acl_entry { /* Access Control List Entry */ |
81 | uint32_t acle_size; |
82 | uint16_t acle_perms; /* Access permissions */ |
83 | uint16_t acle_type; /* Type of entry */ |
84 | uint16_t acle_tag; /* User or group identity */ |
85 | uint16_t acle_pad1; |
86 | uint32_t acle_next; /* Pointer on next entry for the */ |
87 | /* same inode or on next free entry */ |
88 | }; |
89 | |
90 | /* |
91 | * Structure of a blocks group descriptor |
92 | */ |
93 | struct ext2_group_desc { |
94 | uint32_t bg_block_bitmap; /* Blocks bitmap block */ |
95 | uint32_t bg_inode_bitmap; /* Inodes bitmap block */ |
96 | uint32_t bg_inode_table; /* Inodes table block */ |
97 | uint16_t bg_free_blocks_count; /* Free blocks count */ |
98 | uint16_t bg_free_inodes_count; /* Free inodes count */ |
99 | uint16_t bg_used_dirs_count; /* Directories count */ |
100 | uint16_t bg_pad; |
101 | uint32_t bg_reserved[3]; |
102 | }; |
103 | |
104 | /* |
105 | * Data structures used by the directory indexing feature |
106 | * |
107 | * Note: all of the multibyte integer fields are little endian. |
108 | */ |
109 | |
110 | /* |
111 | * Note: dx_root_info is laid out so that if it should somehow get |
112 | * overlaid by a dirent the two low bits of the hash version will be |
113 | * zero. Therefore, the hash version mod 4 should never be 0. |
114 | * Sincerely, the paranoia department. |
115 | */ |
116 | struct ext2_dx_root_info { |
117 | uint32_t reserved_zero; |
118 | uint8_t hash_version; /* 0 now, 1 at release */ |
119 | uint8_t info_length; /* 8 */ |
120 | uint8_t indirect_levels; |
121 | uint8_t unused_flags; |
122 | }; |
123 | |
124 | #define EXT2_HASH_LEGACY 0 |
125 | #define EXT2_HASH_HALF_MD4 1 |
126 | #define EXT2_HASH_TEA 2 |
127 | |
128 | #define EXT2_HASH_FLAG_INCOMPAT 0x1 |
129 | |
130 | struct ext2_dx_entry { |
131 | uint32_t hash; |
132 | uint32_t block; |
133 | }; |
134 | |
135 | struct ext2_dx_countlimit { |
136 | uint16_t limit; |
137 | uint16_t count; |
138 | }; |
139 | |
140 | |
141 | /* |
142 | * Macro-instructions used to manage group descriptors |
143 | */ |
144 | #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) |
145 | #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) |
146 | #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) |
147 | /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ |
148 | #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) |
149 | #define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) |
150 | #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) |
151 | |
152 | /* |
153 | * Constants relative to the data blocks |
154 | */ |
155 | #define EXT2_NDIR_BLOCKS 12 |
156 | #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS |
157 | #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) |
158 | #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) |
159 | #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) |
160 | |
161 | /* |
162 | * Inode flags |
163 | */ |
164 | #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ |
165 | #define EXT2_UNRM_FL 0x00000002 /* Undelete */ |
166 | #define EXT2_COMPR_FL 0x00000004 /* Compress file */ |
167 | #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ |
168 | #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
169 | #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ |
170 | #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ |
171 | #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ |
172 | /* Reserved for compression usage... */ |
173 | #define EXT2_DIRTY_FL 0x00000100 |
174 | #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
175 | #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ |
176 | #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ |
177 | /* End compression flags --- maybe not all used */ |
178 | #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ |
179 | #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ |
180 | #define EXT2_IMAGIC_FL 0x00002000 |
181 | #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ |
182 | #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
183 | #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ |
184 | #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
185 | #define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
186 | #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
187 | |
188 | #define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ |
189 | #define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */ |
190 | |
191 | /* |
192 | * ioctl commands |
193 | */ |
194 | #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) |
195 | #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) |
196 | #define EXT2_IOC_GETVERSION _IOR('v', 1, long) |
197 | #define EXT2_IOC_SETVERSION _IOW('v', 2, long) |
198 | |
199 | /* |
200 | * Structure of an inode on the disk |
201 | */ |
202 | struct ext2_inode { |
203 | uint16_t i_mode; /* File mode */ |
204 | uint16_t i_uid; /* Low 16 bits of Owner Uid */ |
205 | uint32_t i_size; /* Size in bytes */ |
206 | uint32_t i_atime; /* Access time */ |
207 | uint32_t i_ctime; /* Creation time */ |
208 | uint32_t i_mtime; /* Modification time */ |
209 | uint32_t i_dtime; /* Deletion Time */ |
210 | uint16_t i_gid; /* Low 16 bits of Group Id */ |
211 | uint16_t i_links_count; /* Links count */ |
212 | uint32_t i_blocks; /* Blocks count */ |
213 | uint32_t i_flags; /* File flags */ |
214 | union { |
215 | struct { |
216 | uint32_t l_i_reserved1; |
217 | } linux1; |
218 | struct { |
219 | uint32_t h_i_translator; |
220 | } hurd1; |
221 | struct { |
222 | uint32_t m_i_reserved1; |
223 | } masix1; |
224 | } osd1; /* OS dependent 1 */ |
225 | uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
226 | uint32_t i_generation; /* File version (for NFS) */ |
227 | uint32_t i_file_acl; /* File ACL */ |
228 | uint32_t i_dir_acl; /* Directory ACL */ |
229 | uint32_t i_faddr; /* Fragment address */ |
230 | union { |
231 | struct { |
232 | uint8_t l_i_frag; /* Fragment number */ |
233 | uint8_t l_i_fsize; /* Fragment size */ |
234 | uint16_t i_pad1; |
235 | uint16_t l_i_uid_high; /* these 2 fields */ |
236 | uint16_t l_i_gid_high; /* were reserved2[0] */ |
237 | uint32_t l_i_reserved2; |
238 | } linux2; |
239 | struct { |
240 | uint8_t h_i_frag; /* Fragment number */ |
241 | uint8_t h_i_fsize; /* Fragment size */ |
242 | uint16_t h_i_mode_high; |
243 | uint16_t h_i_uid_high; |
244 | uint16_t h_i_gid_high; |
245 | uint32_t h_i_author; |
246 | } hurd2; |
247 | struct { |
248 | uint8_t m_i_frag; /* Fragment number */ |
249 | uint8_t m_i_fsize; /* Fragment size */ |
250 | uint16_t m_pad1; |
251 | uint32_t m_i_reserved2[2]; |
252 | } masix2; |
253 | } osd2; /* OS dependent 2 */ |
254 | }; |
255 | |
256 | /* |
257 | * Permanent part of an large inode on the disk |
258 | */ |
259 | struct ext2_inode_large { |
260 | uint16_t i_mode; /* File mode */ |
261 | uint16_t i_uid; /* Low 16 bits of Owner Uid */ |
262 | uint32_t i_size; /* Size in bytes */ |
263 | uint32_t i_atime; /* Access time */ |
264 | uint32_t i_ctime; /* Creation time */ |
265 | uint32_t i_mtime; /* Modification time */ |
266 | uint32_t i_dtime; /* Deletion Time */ |
267 | uint16_t i_gid; /* Low 16 bits of Group Id */ |
268 | uint16_t i_links_count; /* Links count */ |
269 | uint32_t i_blocks; /* Blocks count */ |
270 | uint32_t i_flags; /* File flags */ |
271 | union { |
272 | struct { |
273 | uint32_t l_i_reserved1; |
274 | } linux1; |
275 | struct { |
276 | uint32_t h_i_translator; |
277 | } hurd1; |
278 | struct { |
279 | uint32_t m_i_reserved1; |
280 | } masix1; |
281 | } osd1; /* OS dependent 1 */ |
282 | uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
283 | uint32_t i_generation; /* File version (for NFS) */ |
284 | uint32_t i_file_acl; /* File ACL */ |
285 | uint32_t i_dir_acl; /* Directory ACL */ |
286 | uint32_t i_faddr; /* Fragment address */ |
287 | union { |
288 | struct { |
289 | uint8_t l_i_frag; /* Fragment number */ |
290 | uint8_t l_i_fsize; /* Fragment size */ |
291 | uint16_t i_pad1; |
292 | uint16_t l_i_uid_high; /* these 2 fields */ |
293 | uint16_t l_i_gid_high; /* were reserved2[0] */ |
294 | uint32_t l_i_reserved2; |
295 | } linux2; |
296 | struct { |
297 | uint8_t h_i_frag; /* Fragment number */ |
298 | uint8_t h_i_fsize; /* Fragment size */ |
299 | uint16_t h_i_mode_high; |
300 | uint16_t h_i_uid_high; |
301 | uint16_t h_i_gid_high; |
302 | uint32_t h_i_author; |
303 | } hurd2; |
304 | struct { |
305 | uint8_t m_i_frag; /* Fragment number */ |
306 | uint8_t m_i_fsize; /* Fragment size */ |
307 | uint16_t m_pad1; |
308 | uint32_t m_i_reserved2[2]; |
309 | } masix2; |
310 | } osd2; /* OS dependent 2 */ |
311 | uint16_t i_extra_isize; |
312 | uint16_t i_pad1; |
313 | }; |
314 | |
315 | #define i_size_high i_dir_acl |
316 | |
317 | /* |
318 | * File system states |
319 | */ |
320 | #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ |
321 | #define EXT2_ERROR_FS 0x0002 /* Errors detected */ |
322 | |
323 | /* |
324 | * Mount flags |
325 | */ |
326 | #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ |
327 | #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ |
328 | #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ |
329 | #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ |
330 | #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ |
331 | #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ |
332 | #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ |
333 | #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ |
334 | |
335 | #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt |
336 | #define set_opt(o, opt) o |= EXT2_MOUNT_##opt |
337 | #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ |
338 | EXT2_MOUNT_##opt) |
339 | /* |
340 | * Maximal mount counts between two filesystem checks |
341 | */ |
342 | #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
343 | #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ |
344 | |
345 | /* |
346 | * Behaviour when detecting errors |
347 | */ |
348 | #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ |
349 | #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ |
350 | #define EXT2_ERRORS_PANIC 3 /* Panic */ |
351 | #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE |
352 | |
353 | /* |
354 | * Structure of the super block |
355 | */ |
356 | struct ext2_super_block { |
357 | uint32_t s_inodes_count; /* Inodes count */ |
358 | uint32_t s_blocks_count; /* Blocks count */ |
359 | uint32_t s_r_blocks_count; /* Reserved blocks count */ |
360 | uint32_t s_free_blocks_count; /* Free blocks count */ |
361 | uint32_t s_free_inodes_count; /* Free inodes count */ |
362 | uint32_t s_first_data_block; /* First Data Block */ |
363 | uint32_t s_log_block_size; /* Block size */ |
364 | int32_t s_log_frag_size; /* Fragment size */ |
365 | uint32_t s_blocks_per_group; /* # Blocks per group */ |
366 | uint32_t s_frags_per_group; /* # Fragments per group */ |
367 | uint32_t s_inodes_per_group; /* # Inodes per group */ |
368 | uint32_t s_mtime; /* Mount time */ |
369 | uint32_t s_wtime; /* Write time */ |
370 | uint16_t s_mnt_count; /* Mount count */ |
371 | int16_t s_max_mnt_count; /* Maximal mount count */ |
372 | uint16_t s_magic; /* Magic signature */ |
373 | uint16_t s_state; /* File system state */ |
374 | uint16_t s_errors; /* Behaviour when detecting errors */ |
375 | uint16_t s_minor_rev_level; /* minor revision level */ |
376 | uint32_t s_lastcheck; /* time of last check */ |
377 | uint32_t s_checkinterval; /* max. time between checks */ |
378 | uint32_t s_creator_os; /* OS */ |
379 | uint32_t s_rev_level; /* Revision level */ |
380 | uint16_t s_def_resuid; /* Default uid for reserved blocks */ |
381 | uint16_t s_def_resgid; /* Default gid for reserved blocks */ |
382 | /* |
383 | * These fields are for EXT2_DYNAMIC_REV superblocks only. |
384 | * |
385 | * Note: the difference between the compatible feature set and |
386 | * the incompatible feature set is that if there is a bit set |
387 | * in the incompatible feature set that the kernel doesn't |
388 | * know about, it should refuse to mount the filesystem. |
389 | * |
390 | * e2fsck's requirements are more strict; if it doesn't know |
391 | * about a feature in either the compatible or incompatible |
392 | * feature set, it must abort and not try to meddle with |
393 | * things it doesn't understand... |
394 | */ |
395 | uint32_t s_first_ino; /* First non-reserved inode */ |
396 | uint16_t s_inode_size; /* size of inode structure */ |
397 | uint16_t s_block_group_nr; /* block group # of this superblock */ |
398 | uint32_t s_feature_compat; /* compatible feature set */ |
399 | uint32_t s_feature_incompat; /* incompatible feature set */ |
400 | uint32_t s_feature_ro_compat; /* readonly-compatible feature set */ |
401 | uint8_t s_uuid[16]; /* 128-bit uuid for volume */ |
402 | char s_volume_name[16]; /* volume name */ |
403 | char s_last_mounted[64]; /* directory where last mounted */ |
404 | uint32_t s_algorithm_usage_bitmap; /* For compression */ |
405 | /* |
406 | * Performance hints. Directory preallocation should only |
407 | * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
408 | */ |
409 | uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
410 | uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ |
411 | uint16_t s_reserved_gdt_blocks; /* Per group table for online growth */ |
412 | /* |
413 | * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. |
414 | */ |
415 | uint8_t s_journal_uuid[16]; /* uuid of journal superblock */ |
416 | uint32_t s_journal_inum; /* inode number of journal file */ |
417 | uint32_t s_journal_dev; /* device number of journal file */ |
418 | uint32_t s_last_orphan; /* start of list of inodes to delete */ |
419 | uint32_t s_hash_seed[4]; /* HTREE hash seed */ |
420 | uint8_t s_def_hash_version; /* Default hash version to use */ |
421 | uint8_t s_jnl_backup_type; /* Default type of journal backup */ |
422 | uint16_t s_reserved_word_pad; |
423 | uint32_t s_default_mount_opts; |
424 | uint32_t s_first_meta_bg; /* First metablock group */ |
425 | uint32_t s_mkfs_time; /* When the filesystem was created */ |
426 | uint32_t s_jnl_blocks[17]; /* Backup of the journal inode */ |
427 | uint32_t s_reserved[172]; /* Padding to the end of the block */ |
428 | }; |
429 | |
430 | /* |
431 | * Codes for operating systems |
432 | */ |
433 | #define EXT2_OS_LINUX 0 |
434 | #define EXT2_OS_HURD 1 |
435 | #define EXT2_OS_MASIX 2 |
436 | #define EXT2_OS_FREEBSD 3 |
437 | #define EXT2_OS_LITES 4 |
438 | |
439 | /* |
440 | * Revision levels |
441 | */ |
442 | #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ |
443 | #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
444 | |
445 | #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV |
446 | #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV |
447 | |
448 | #define EXT2_GOOD_OLD_INODE_SIZE 128 |
449 | |
450 | /* |
451 | * Journal inode backup types |
452 | */ |
453 | #define EXT3_JNL_BACKUP_BLOCKS 1 |
454 | |
455 | /* |
456 | * Feature set definitions |
457 | */ |
458 | |
459 | #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ |
460 | ( EXT2_SB(sb)->s_feature_compat & (mask) ) |
461 | #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
462 | ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) |
463 | #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ |
464 | ( EXT2_SB(sb)->s_feature_incompat & (mask) ) |
465 | |
466 | #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 |
467 | #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 |
468 | #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
469 | #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 |
470 | #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 |
471 | #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 |
472 | |
473 | #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
474 | #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
475 | /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ |
476 | |
477 | #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
478 | #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 |
479 | #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ |
480 | #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ |
481 | #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 |
482 | #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 |
483 | |
484 | |
485 | #define EXT2_FEATURE_COMPAT_SUPP 0 |
486 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) |
487 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
488 | EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ |
489 | EXT2_FEATURE_RO_COMPAT_BTREE_DIR) |
490 | |
491 | /* |
492 | * Default values for user and/or group using reserved blocks |
493 | */ |
494 | #define EXT2_DEF_RESUID 0 |
495 | #define EXT2_DEF_RESGID 0 |
496 | |
497 | /* |
498 | * Default mount options |
499 | */ |
500 | #define EXT2_DEFM_DEBUG 0x0001 |
501 | #define EXT2_DEFM_BSDGROUPS 0x0002 |
502 | #define EXT2_DEFM_XATTR_USER 0x0004 |
503 | #define EXT2_DEFM_ACL 0x0008 |
504 | #define EXT2_DEFM_UID16 0x0010 |
505 | #define EXT3_DEFM_JMODE 0x0060 |
506 | #define EXT3_DEFM_JMODE_DATA 0x0020 |
507 | #define EXT3_DEFM_JMODE_ORDERED 0x0040 |
508 | #define EXT3_DEFM_JMODE_WBACK 0x0060 |
509 | |
510 | /* |
511 | * Structure of a directory entry |
512 | */ |
513 | #define EXT2_NAME_LEN 255 |
514 | |
515 | struct ext2_dir_entry { |
516 | uint32_t inode; /* Inode number */ |
517 | uint16_t rec_len; /* Directory entry length */ |
518 | uint16_t name_len; /* Name length */ |
519 | char name[EXT2_NAME_LEN]; /* File name */ |
520 | }; |
521 | |
522 | /* |
523 | * The new version of the directory entry. Since EXT2 structures are |
524 | * stored in intel byte order, and the name_len field could never be |
525 | * bigger than 255 chars, it's safe to reclaim the extra byte for the |
526 | * file_type field. |
527 | */ |
528 | struct ext2_dir_entry_2 { |
529 | uint32_t inode; /* Inode number */ |
530 | uint16_t rec_len; /* Directory entry length */ |
531 | uint8_t name_len; /* Name length */ |
532 | uint8_t file_type; |
533 | char name[EXT2_NAME_LEN]; /* File name */ |
534 | }; |
535 | |
536 | /* |
537 | * Ext2 directory file types. Only the low 3 bits are used. The |
538 | * other bits are reserved for now. |
539 | */ |
540 | #define EXT2_FT_UNKNOWN 0 |
541 | #define EXT2_FT_REG_FILE 1 |
542 | #define EXT2_FT_DIR 2 |
543 | #define EXT2_FT_CHRDEV 3 |
544 | #define EXT2_FT_BLKDEV 4 |
545 | #define EXT2_FT_FIFO 5 |
546 | #define EXT2_FT_SOCK 6 |
547 | #define EXT2_FT_SYMLINK 7 |
548 | |
549 | #define EXT2_FT_MAX 8 |
550 | |
551 | /* |
552 | * EXT2_DIR_PAD defines the directory entries boundaries |
553 | * |
554 | * NOTE: It must be a multiple of 4 |
555 | */ |
556 | #define EXT2_DIR_PAD 4 |
557 | #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) |
558 | #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ |
559 | ~EXT2_DIR_ROUND) |
560 | |
561 | #endif |