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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/ext2_fs.h | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/include/linux/minix_fs.h | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | */ | |
15 | ||
16 | #ifndef _LINUX_EXT2_FS_H | |
17 | #define _LINUX_EXT2_FS_H | |
18 | ||
19 | #include <linux/types.h> | |
e18fa700 | 20 | #include <linux/magic.h> |
1da177e4 LT |
21 | |
22 | /* | |
23 | * The second extended filesystem constants/structures | |
24 | */ | |
25 | ||
26 | /* | |
27 | * Define EXT2FS_DEBUG to produce debug messages | |
28 | */ | |
29 | #undef EXT2FS_DEBUG | |
30 | ||
31 | /* | |
a686cd89 | 32 | * Define EXT2_RESERVATION to reserve data blocks for expanding files |
1da177e4 | 33 | */ |
a686cd89 MB |
34 | #define EXT2_DEFAULT_RESERVE_BLOCKS 8 |
35 | /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ | |
36 | #define EXT2_MAX_RESERVE_BLOCKS 1027 | |
37 | #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 | |
1da177e4 LT |
38 | /* |
39 | * The second extended file system version | |
40 | */ | |
41 | #define EXT2FS_DATE "95/08/09" | |
42 | #define EXT2FS_VERSION "0.5b" | |
43 | ||
44 | /* | |
45 | * Debug code | |
46 | */ | |
47 | #ifdef EXT2FS_DEBUG | |
48 | # define ext2_debug(f, a...) { \ | |
49 | printk ("EXT2-fs DEBUG (%s, %d): %s:", \ | |
d5c003b4 | 50 | __FILE__, __LINE__, __func__); \ |
1da177e4 LT |
51 | printk (f, ## a); \ |
52 | } | |
53 | #else | |
54 | # define ext2_debug(f, a...) /**/ | |
55 | #endif | |
56 | ||
57 | /* | |
58 | * Special inode numbers | |
59 | */ | |
60 | #define EXT2_BAD_INO 1 /* Bad blocks inode */ | |
61 | #define EXT2_ROOT_INO 2 /* Root inode */ | |
62 | #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ | |
63 | #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
64 | ||
65 | /* First non-reserved inode for old ext2 filesystems */ | |
66 | #define EXT2_GOOD_OLD_FIRST_INO 11 | |
67 | ||
1da177e4 | 68 | #ifdef __KERNEL__ |
52a78c1c | 69 | #include <linux/ext2_fs_sb.h> |
1da177e4 LT |
70 | static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) |
71 | { | |
72 | return sb->s_fs_info; | |
73 | } | |
74 | #else | |
75 | /* Assume that user mode programs are passing in an ext2fs superblock, not | |
76 | * a kernel struct super_block. This will allow us to call the feature-test | |
77 | * macros from user land. */ | |
78 | #define EXT2_SB(sb) (sb) | |
79 | #endif | |
80 | ||
81 | /* | |
82 | * Maximal count of links to a file | |
83 | */ | |
84 | #define EXT2_LINK_MAX 32000 | |
85 | ||
86 | /* | |
87 | * Macro-instructions used to manage several block sizes | |
88 | */ | |
89 | #define EXT2_MIN_BLOCK_SIZE 1024 | |
90 | #define EXT2_MAX_BLOCK_SIZE 4096 | |
91 | #define EXT2_MIN_BLOCK_LOG_SIZE 10 | |
92 | #ifdef __KERNEL__ | |
93 | # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) | |
94 | #else | |
95 | # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) | |
96 | #endif | |
97 | #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) | |
98 | #ifdef __KERNEL__ | |
99 | # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) | |
100 | #else | |
101 | # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) | |
102 | #endif | |
103 | #ifdef __KERNEL__ | |
104 | #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) | |
105 | #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) | |
106 | #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) | |
107 | #else | |
108 | #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ | |
109 | EXT2_GOOD_OLD_INODE_SIZE : \ | |
110 | (s)->s_inode_size) | |
111 | #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ | |
112 | EXT2_GOOD_OLD_FIRST_INO : \ | |
113 | (s)->s_first_ino) | |
114 | #endif | |
115 | ||
116 | /* | |
117 | * Macro-instructions used to manage fragments | |
118 | */ | |
119 | #define EXT2_MIN_FRAG_SIZE 1024 | |
120 | #define EXT2_MAX_FRAG_SIZE 4096 | |
121 | #define EXT2_MIN_FRAG_LOG_SIZE 10 | |
122 | #ifdef __KERNEL__ | |
123 | # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) | |
124 | # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) | |
125 | #else | |
126 | # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) | |
127 | # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) | |
128 | #endif | |
129 | ||
130 | /* | |
131 | * Structure of a blocks group descriptor | |
132 | */ | |
133 | struct ext2_group_desc | |
134 | { | |
135 | __le32 bg_block_bitmap; /* Blocks bitmap block */ | |
136 | __le32 bg_inode_bitmap; /* Inodes bitmap block */ | |
137 | __le32 bg_inode_table; /* Inodes table block */ | |
138 | __le16 bg_free_blocks_count; /* Free blocks count */ | |
139 | __le16 bg_free_inodes_count; /* Free inodes count */ | |
140 | __le16 bg_used_dirs_count; /* Directories count */ | |
141 | __le16 bg_pad; | |
142 | __le32 bg_reserved[3]; | |
143 | }; | |
144 | ||
145 | /* | |
146 | * Macro-instructions used to manage group descriptors | |
147 | */ | |
148 | #ifdef __KERNEL__ | |
149 | # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) | |
150 | # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) | |
151 | # define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) | |
152 | # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) | |
153 | #else | |
154 | # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) | |
155 | # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) | |
156 | # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) | |
157 | #endif | |
158 | ||
159 | /* | |
160 | * Constants relative to the data blocks | |
161 | */ | |
162 | #define EXT2_NDIR_BLOCKS 12 | |
163 | #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS | |
164 | #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) | |
165 | #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) | |
166 | #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) | |
167 | ||
168 | /* | |
36695673 DH |
169 | * Inode flags (GETFLAGS/SETFLAGS) |
170 | */ | |
171 | #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ | |
172 | #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ | |
173 | #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ | |
174 | #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ | |
175 | #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ | |
176 | #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ | |
177 | #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ | |
178 | #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ | |
1da177e4 | 179 | /* Reserved for compression usage... */ |
36695673 DH |
180 | #define EXT2_DIRTY_FL FS_DIRTY_FL |
181 | #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ | |
182 | #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ | |
183 | #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ | |
1da177e4 | 184 | /* End compression flags --- maybe not all used */ |
36695673 DH |
185 | #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ |
186 | #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ | |
187 | #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ | |
188 | #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ | |
189 | #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ | |
190 | #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ | |
191 | #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ | |
192 | #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ | |
1da177e4 | 193 | |
36695673 DH |
194 | #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ |
195 | #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ | |
1da177e4 | 196 | |
0e090f1e DG |
197 | /* Flags that should be inherited by new inodes from their parent. */ |
198 | #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ | |
199 | EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\ | |
200 | EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\ | |
201 | EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ | |
202 | EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) | |
203 | ||
ef8b6461 DG |
204 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
205 | #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) | |
206 | ||
207 | /* Flags that are appropriate for non-directories/regular files. */ | |
208 | #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) | |
209 | ||
210 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
211 | static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) | |
212 | { | |
213 | if (S_ISDIR(mode)) | |
214 | return flags; | |
215 | else if (S_ISREG(mode)) | |
216 | return flags & EXT2_REG_FLMASK; | |
217 | else | |
218 | return flags & EXT2_OTHER_FLMASK; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | /* |
222 | * ioctl commands | |
223 | */ | |
36695673 DH |
224 | #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS |
225 | #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS | |
226 | #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION | |
227 | #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION | |
a686cd89 MB |
228 | #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) |
229 | #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) | |
36695673 DH |
230 | |
231 | /* | |
232 | * ioctl commands in 32 bit emulation | |
233 | */ | |
234 | #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS | |
235 | #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
236 | #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION | |
237 | #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION | |
1da177e4 LT |
238 | |
239 | /* | |
240 | * Structure of an inode on the disk | |
241 | */ | |
242 | struct ext2_inode { | |
243 | __le16 i_mode; /* File mode */ | |
244 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
245 | __le32 i_size; /* Size in bytes */ | |
246 | __le32 i_atime; /* Access time */ | |
247 | __le32 i_ctime; /* Creation time */ | |
248 | __le32 i_mtime; /* Modification time */ | |
249 | __le32 i_dtime; /* Deletion Time */ | |
250 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
251 | __le16 i_links_count; /* Links count */ | |
252 | __le32 i_blocks; /* Blocks count */ | |
253 | __le32 i_flags; /* File flags */ | |
254 | union { | |
255 | struct { | |
256 | __le32 l_i_reserved1; | |
257 | } linux1; | |
258 | struct { | |
259 | __le32 h_i_translator; | |
260 | } hurd1; | |
261 | struct { | |
262 | __le32 m_i_reserved1; | |
263 | } masix1; | |
264 | } osd1; /* OS dependent 1 */ | |
265 | __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ | |
266 | __le32 i_generation; /* File version (for NFS) */ | |
267 | __le32 i_file_acl; /* File ACL */ | |
268 | __le32 i_dir_acl; /* Directory ACL */ | |
269 | __le32 i_faddr; /* Fragment address */ | |
270 | union { | |
271 | struct { | |
272 | __u8 l_i_frag; /* Fragment number */ | |
273 | __u8 l_i_fsize; /* Fragment size */ | |
274 | __u16 i_pad1; | |
275 | __le16 l_i_uid_high; /* these 2 fields */ | |
276 | __le16 l_i_gid_high; /* were reserved2[0] */ | |
277 | __u32 l_i_reserved2; | |
278 | } linux2; | |
279 | struct { | |
280 | __u8 h_i_frag; /* Fragment number */ | |
281 | __u8 h_i_fsize; /* Fragment size */ | |
282 | __le16 h_i_mode_high; | |
283 | __le16 h_i_uid_high; | |
284 | __le16 h_i_gid_high; | |
285 | __le32 h_i_author; | |
286 | } hurd2; | |
287 | struct { | |
288 | __u8 m_i_frag; /* Fragment number */ | |
289 | __u8 m_i_fsize; /* Fragment size */ | |
290 | __u16 m_pad1; | |
291 | __u32 m_i_reserved2[2]; | |
292 | } masix2; | |
293 | } osd2; /* OS dependent 2 */ | |
294 | }; | |
295 | ||
296 | #define i_size_high i_dir_acl | |
297 | ||
298 | #if defined(__KERNEL__) || defined(__linux__) | |
299 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
300 | #define i_frag osd2.linux2.l_i_frag | |
301 | #define i_fsize osd2.linux2.l_i_fsize | |
302 | #define i_uid_low i_uid | |
303 | #define i_gid_low i_gid | |
304 | #define i_uid_high osd2.linux2.l_i_uid_high | |
305 | #define i_gid_high osd2.linux2.l_i_gid_high | |
306 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
307 | #endif | |
308 | ||
309 | #ifdef __hurd__ | |
310 | #define i_translator osd1.hurd1.h_i_translator | |
50c33a84 ST |
311 | #define i_frag osd2.hurd2.h_i_frag |
312 | #define i_fsize osd2.hurd2.h_i_fsize | |
1da177e4 LT |
313 | #define i_uid_high osd2.hurd2.h_i_uid_high |
314 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
315 | #define i_author osd2.hurd2.h_i_author | |
316 | #endif | |
317 | ||
318 | #ifdef __masix__ | |
319 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
320 | #define i_frag osd2.masix2.m_i_frag | |
321 | #define i_fsize osd2.masix2.m_i_fsize | |
322 | #define i_reserved2 osd2.masix2.m_i_reserved2 | |
323 | #endif | |
324 | ||
325 | /* | |
326 | * File system states | |
327 | */ | |
328 | #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ | |
329 | #define EXT2_ERROR_FS 0x0002 /* Errors detected */ | |
330 | ||
331 | /* | |
332 | * Mount flags | |
333 | */ | |
6d79125b CO |
334 | #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ |
335 | #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ | |
336 | #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ | |
337 | #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ | |
338 | #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ | |
339 | #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ | |
340 | #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ | |
341 | #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ | |
342 | #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ | |
343 | #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ | |
344 | #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ | |
345 | #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ | |
346 | #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ | |
a686cd89 MB |
347 | #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ |
348 | #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ | |
349 | #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ | |
8fc2751b | 350 | |
1da177e4 LT |
351 | |
352 | #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt | |
353 | #define set_opt(o, opt) o |= EXT2_MOUNT_##opt | |
354 | #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ | |
355 | EXT2_MOUNT_##opt) | |
356 | /* | |
357 | * Maximal mount counts between two filesystem checks | |
358 | */ | |
359 | #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ | |
360 | #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
361 | ||
362 | /* | |
363 | * Behaviour when detecting errors | |
364 | */ | |
365 | #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ | |
366 | #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ | |
367 | #define EXT2_ERRORS_PANIC 3 /* Panic */ | |
368 | #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE | |
369 | ||
370 | /* | |
371 | * Structure of the super block | |
372 | */ | |
373 | struct ext2_super_block { | |
374 | __le32 s_inodes_count; /* Inodes count */ | |
375 | __le32 s_blocks_count; /* Blocks count */ | |
376 | __le32 s_r_blocks_count; /* Reserved blocks count */ | |
377 | __le32 s_free_blocks_count; /* Free blocks count */ | |
378 | __le32 s_free_inodes_count; /* Free inodes count */ | |
379 | __le32 s_first_data_block; /* First Data Block */ | |
380 | __le32 s_log_block_size; /* Block size */ | |
381 | __le32 s_log_frag_size; /* Fragment size */ | |
382 | __le32 s_blocks_per_group; /* # Blocks per group */ | |
383 | __le32 s_frags_per_group; /* # Fragments per group */ | |
384 | __le32 s_inodes_per_group; /* # Inodes per group */ | |
385 | __le32 s_mtime; /* Mount time */ | |
386 | __le32 s_wtime; /* Write time */ | |
387 | __le16 s_mnt_count; /* Mount count */ | |
388 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
389 | __le16 s_magic; /* Magic signature */ | |
390 | __le16 s_state; /* File system state */ | |
391 | __le16 s_errors; /* Behaviour when detecting errors */ | |
392 | __le16 s_minor_rev_level; /* minor revision level */ | |
393 | __le32 s_lastcheck; /* time of last check */ | |
394 | __le32 s_checkinterval; /* max. time between checks */ | |
395 | __le32 s_creator_os; /* OS */ | |
396 | __le32 s_rev_level; /* Revision level */ | |
397 | __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
398 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
399 | /* | |
400 | * These fields are for EXT2_DYNAMIC_REV superblocks only. | |
401 | * | |
402 | * Note: the difference between the compatible feature set and | |
403 | * the incompatible feature set is that if there is a bit set | |
404 | * in the incompatible feature set that the kernel doesn't | |
405 | * know about, it should refuse to mount the filesystem. | |
406 | * | |
407 | * e2fsck's requirements are more strict; if it doesn't know | |
408 | * about a feature in either the compatible or incompatible | |
409 | * feature set, it must abort and not try to meddle with | |
410 | * things it doesn't understand... | |
411 | */ | |
412 | __le32 s_first_ino; /* First non-reserved inode */ | |
413 | __le16 s_inode_size; /* size of inode structure */ | |
414 | __le16 s_block_group_nr; /* block group # of this superblock */ | |
415 | __le32 s_feature_compat; /* compatible feature set */ | |
416 | __le32 s_feature_incompat; /* incompatible feature set */ | |
417 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
418 | __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
419 | char s_volume_name[16]; /* volume name */ | |
420 | char s_last_mounted[64]; /* directory where last mounted */ | |
421 | __le32 s_algorithm_usage_bitmap; /* For compression */ | |
422 | /* | |
423 | * Performance hints. Directory preallocation should only | |
424 | * happen if the EXT2_COMPAT_PREALLOC flag is on. | |
425 | */ | |
426 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
427 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
428 | __u16 s_padding1; | |
429 | /* | |
430 | * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. | |
431 | */ | |
432 | __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
433 | __u32 s_journal_inum; /* inode number of journal file */ | |
434 | __u32 s_journal_dev; /* device number of journal file */ | |
435 | __u32 s_last_orphan; /* start of list of inodes to delete */ | |
436 | __u32 s_hash_seed[4]; /* HTREE hash seed */ | |
437 | __u8 s_def_hash_version; /* Default hash version to use */ | |
438 | __u8 s_reserved_char_pad; | |
439 | __u16 s_reserved_word_pad; | |
440 | __le32 s_default_mount_opts; | |
441 | __le32 s_first_meta_bg; /* First metablock block group */ | |
442 | __u32 s_reserved[190]; /* Padding to the end of the block */ | |
443 | }; | |
444 | ||
445 | /* | |
446 | * Codes for operating systems | |
447 | */ | |
448 | #define EXT2_OS_LINUX 0 | |
449 | #define EXT2_OS_HURD 1 | |
450 | #define EXT2_OS_MASIX 2 | |
451 | #define EXT2_OS_FREEBSD 3 | |
452 | #define EXT2_OS_LITES 4 | |
453 | ||
454 | /* | |
455 | * Revision levels | |
456 | */ | |
457 | #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ | |
458 | #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
459 | ||
460 | #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV | |
461 | #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV | |
462 | ||
463 | #define EXT2_GOOD_OLD_INODE_SIZE 128 | |
464 | ||
465 | /* | |
466 | * Feature set definitions | |
467 | */ | |
468 | ||
469 | #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ | |
470 | ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) | |
471 | #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ | |
472 | ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) | |
473 | #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ | |
474 | ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) | |
475 | #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ | |
476 | EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
477 | #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
478 | EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
479 | #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ | |
480 | EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
481 | #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
482 | EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
483 | #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
484 | EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
485 | #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
486 | EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
487 | ||
488 | #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
489 | #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
490 | #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
491 | #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
492 | #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 | |
493 | #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
494 | #define EXT2_FEATURE_COMPAT_ANY 0xffffffff | |
495 | ||
496 | #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
497 | #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
498 | #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
499 | #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff | |
500 | ||
501 | #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
502 | #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
503 | #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 | |
504 | #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 | |
505 | #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 | |
506 | #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff | |
507 | ||
508 | #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
509 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ | |
510 | EXT2_FEATURE_INCOMPAT_META_BG) | |
511 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ | |
512 | EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
513 | EXT2_FEATURE_RO_COMPAT_BTREE_DIR) | |
514 | #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP | |
515 | #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP | |
516 | ||
517 | /* | |
518 | * Default values for user and/or group using reserved blocks | |
519 | */ | |
520 | #define EXT2_DEF_RESUID 0 | |
521 | #define EXT2_DEF_RESGID 0 | |
522 | ||
523 | /* | |
524 | * Default mount options | |
525 | */ | |
526 | #define EXT2_DEFM_DEBUG 0x0001 | |
527 | #define EXT2_DEFM_BSDGROUPS 0x0002 | |
528 | #define EXT2_DEFM_XATTR_USER 0x0004 | |
529 | #define EXT2_DEFM_ACL 0x0008 | |
530 | #define EXT2_DEFM_UID16 0x0010 | |
531 | /* Not used by ext2, but reserved for use by ext3 */ | |
532 | #define EXT3_DEFM_JMODE 0x0060 | |
533 | #define EXT3_DEFM_JMODE_DATA 0x0020 | |
534 | #define EXT3_DEFM_JMODE_ORDERED 0x0040 | |
535 | #define EXT3_DEFM_JMODE_WBACK 0x0060 | |
536 | ||
537 | /* | |
538 | * Structure of a directory entry | |
539 | */ | |
540 | #define EXT2_NAME_LEN 255 | |
541 | ||
542 | struct ext2_dir_entry { | |
543 | __le32 inode; /* Inode number */ | |
544 | __le16 rec_len; /* Directory entry length */ | |
545 | __le16 name_len; /* Name length */ | |
546 | char name[EXT2_NAME_LEN]; /* File name */ | |
547 | }; | |
548 | ||
549 | /* | |
550 | * The new version of the directory entry. Since EXT2 structures are | |
551 | * stored in intel byte order, and the name_len field could never be | |
552 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
553 | * file_type field. | |
554 | */ | |
555 | struct ext2_dir_entry_2 { | |
556 | __le32 inode; /* Inode number */ | |
557 | __le16 rec_len; /* Directory entry length */ | |
558 | __u8 name_len; /* Name length */ | |
559 | __u8 file_type; | |
560 | char name[EXT2_NAME_LEN]; /* File name */ | |
561 | }; | |
562 | ||
563 | /* | |
564 | * Ext2 directory file types. Only the low 3 bits are used. The | |
565 | * other bits are reserved for now. | |
566 | */ | |
567 | enum { | |
ad888a1f JB |
568 | EXT2_FT_UNKNOWN = 0, |
569 | EXT2_FT_REG_FILE = 1, | |
570 | EXT2_FT_DIR = 2, | |
571 | EXT2_FT_CHRDEV = 3, | |
572 | EXT2_FT_BLKDEV = 4, | |
573 | EXT2_FT_FIFO = 5, | |
574 | EXT2_FT_SOCK = 6, | |
575 | EXT2_FT_SYMLINK = 7, | |
1da177e4 LT |
576 | EXT2_FT_MAX |
577 | }; | |
578 | ||
579 | /* | |
580 | * EXT2_DIR_PAD defines the directory entries boundaries | |
581 | * | |
582 | * NOTE: It must be a multiple of 4 | |
583 | */ | |
584 | #define EXT2_DIR_PAD 4 | |
585 | #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) | |
586 | #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ | |
587 | ~EXT2_DIR_ROUND) | |
89910ccc | 588 | #define EXT2_MAX_REC_LEN ((1<<16)-1) |
1da177e4 LT |
589 | |
590 | #endif /* _LINUX_EXT2_FS_H */ |