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9f8046fc TT |
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 | ||
797f5ef1 | 19 | #include <ext2fs/ext2_types.h> /* Changed from linux/types.h */ |
9f8046fc | 20 | |
98c6113b TT |
21 | #ifndef __GNUC_PREREQ |
22 | #if defined(__GNUC__) && defined(__GNUC_MINOR__) | |
23 | #define __GNUC_PREREQ(maj, min) \ | |
24 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) | |
25 | #else | |
26 | #define __GNUC_PREREQ(maj, min) 0 | |
27 | #endif | |
28 | #endif | |
29 | ||
9f8046fc TT |
30 | /* |
31 | * The second extended filesystem constants/structures | |
32 | */ | |
33 | ||
34 | /* | |
35 | * Define EXT2FS_DEBUG to produce debug messages | |
36 | */ | |
37 | #undef EXT2FS_DEBUG | |
38 | ||
39 | /* | |
40 | * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files | |
41 | */ | |
42 | #define EXT2_PREALLOCATE | |
43 | #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 | |
44 | ||
45 | /* | |
46 | * The second extended file system version | |
47 | */ | |
48 | #define EXT2FS_DATE "95/08/09" | |
49 | #define EXT2FS_VERSION "0.5b" | |
50 | ||
51 | /* | |
0fbd1a8a | 52 | * Special inode numbers |
9f8046fc | 53 | */ |
0fbd1a8a | 54 | #define EXT2_BAD_INO 1 /* Bad blocks inode */ |
9f8046fc | 55 | #define EXT2_ROOT_INO 2 /* Root inode */ |
0edcc270 AK |
56 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
57 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ | |
9f8046fc TT |
58 | #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ |
59 | #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
60 | #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
61 | #define EXT2_JOURNAL_INO 8 /* Journal inode */ | |
6d0ed678 | 62 | #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */ |
991211f6 | 63 | #define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */ |
9f8046fc TT |
64 | |
65 | /* First non-reserved inode for old ext2 filesystems */ | |
66 | #define EXT2_GOOD_OLD_FIRST_INO 11 | |
67 | ||
68 | /* | |
69 | * The second extended file system magic number | |
70 | */ | |
71 | #define EXT2_SUPER_MAGIC 0xEF53 | |
72 | ||
0fbd1a8a AD |
73 | #ifdef __KERNEL__ |
74 | #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) | |
75 | #else | |
76 | /* Assume that user mode programs are passing in an ext2fs superblock, not | |
77 | * a kernel struct super_block. This will allow us to call the feature-test | |
78 | * macros from user land. */ | |
79 | #define EXT2_SB(sb) (sb) | |
80 | #endif | |
81 | ||
9f8046fc TT |
82 | /* |
83 | * Maximal count of links to a file | |
84 | */ | |
bec6f49a | 85 | #define EXT2_LINK_MAX 65000 |
9f8046fc TT |
86 | |
87 | /* | |
88 | * Macro-instructions used to manage several block sizes | |
89 | */ | |
932a489c | 90 | #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ |
39dc1c45 | 91 | #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ |
7da78ff1 AD |
92 | #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) |
93 | #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) | |
9f8046fc | 94 | #ifdef __KERNEL__ |
7da78ff1 AD |
95 | #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) |
96 | #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) | |
0fbd1a8a | 97 | #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) |
7da78ff1 AD |
98 | #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) |
99 | #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) | |
9f8046fc | 100 | #else |
7da78ff1 AD |
101 | #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
102 | #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) | |
9f8046fc | 103 | #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ |
7da78ff1 | 104 | EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) |
9f8046fc | 105 | #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ |
7da78ff1 | 106 | EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) |
9f8046fc | 107 | #endif |
7da78ff1 | 108 | #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) |
9f8046fc TT |
109 | |
110 | /* | |
412376ef | 111 | * Macro-instructions used to manage allocation clusters |
9f8046fc | 112 | */ |
412376ef TT |
113 | #define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE |
114 | #define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */ | |
115 | #define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE | |
116 | #define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) | |
117 | #define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ | |
118 | (s)->s_log_cluster_size) | |
119 | #define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) | |
9f8046fc | 120 | |
3fbfad55 TT |
121 | /* |
122 | * Macro-instructions used to manage fragments | |
123 | * | |
124 | * Note: for backwards compatibility only, for the dump program. | |
125 | * Ext2/3/4 will never support fragments.... | |
126 | */ | |
127 | #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE | |
128 | #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE | |
129 | #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE | |
130 | #define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) | |
131 | #define EXT2_FRAGS_PER_BLOCK(s) 1 | |
132 | ||
9f8046fc TT |
133 | /* |
134 | * ACL structures | |
135 | */ | |
136 | struct ext2_acl_header /* Header of Access Control Lists */ | |
137 | { | |
138 | __u32 aclh_size; | |
139 | __u32 aclh_file_count; | |
140 | __u32 aclh_acle_count; | |
141 | __u32 aclh_first_acle; | |
142 | }; | |
143 | ||
144 | struct ext2_acl_entry /* Access Control List Entry */ | |
145 | { | |
146 | __u32 acle_size; | |
147 | __u16 acle_perms; /* Access permissions */ | |
148 | __u16 acle_type; /* Type of entry */ | |
149 | __u16 acle_tag; /* User or group identity */ | |
150 | __u16 acle_pad1; | |
151 | __u32 acle_next; /* Pointer on next entry for the */ | |
152 | /* same inode or on next free entry */ | |
153 | }; | |
154 | ||
155 | /* | |
156 | * Structure of a blocks group descriptor | |
157 | */ | |
158 | struct ext2_group_desc | |
159 | { | |
8061d2c1 TT |
160 | __u32 bg_block_bitmap; /* Blocks bitmap block */ |
161 | __u32 bg_inode_bitmap; /* Inodes bitmap block */ | |
9f8046fc TT |
162 | __u32 bg_inode_table; /* Inodes table block */ |
163 | __u16 bg_free_blocks_count; /* Free blocks count */ | |
164 | __u16 bg_free_inodes_count; /* Free inodes count */ | |
165 | __u16 bg_used_dirs_count; /* Directories count */ | |
f5fa2007 | 166 | __u16 bg_flags; |
89efc88e TT |
167 | __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
168 | __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ | |
169 | __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ | |
8815fb8a | 170 | __u16 bg_itable_unused; /* Unused inodes count */ |
11d1116a | 171 | __u16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/ |
9f8046fc TT |
172 | }; |
173 | ||
3c4d4d74 VAH |
174 | /* |
175 | * Structure of a blocks group descriptor | |
176 | */ | |
8061d2c1 TT |
177 | struct ext4_group_desc |
178 | { | |
179 | __u32 bg_block_bitmap; /* Blocks bitmap block */ | |
180 | __u32 bg_inode_bitmap; /* Inodes bitmap block */ | |
181 | __u32 bg_inode_table; /* Inodes table block */ | |
182 | __u16 bg_free_blocks_count; /* Free blocks count */ | |
183 | __u16 bg_free_inodes_count; /* Free inodes count */ | |
184 | __u16 bg_used_dirs_count; /* Directories count */ | |
3c4d4d74 | 185 | __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
89efc88e TT |
186 | __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
187 | __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ | |
188 | __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ | |
8061d2c1 | 189 | __u16 bg_itable_unused; /* Unused inodes count */ |
3c4d4d74 | 190 | __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
8061d2c1 TT |
191 | __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
192 | __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
193 | __u32 bg_inode_table_hi; /* Inodes table block MSB */ | |
194 | __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ | |
195 | __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
196 | __u16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
3c4d4d74 | 197 | __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
89efc88e TT |
198 | __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ |
199 | __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ | |
200 | __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ | |
201 | __u32 bg_reserved; | |
8061d2c1 TT |
202 | }; |
203 | ||
a80ea340 DW |
204 | #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ |
205 | (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ | |
206 | sizeof(__u16)) | |
e7dc95c6 DW |
207 | #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION \ |
208 | (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ | |
209 | sizeof(__u16)) | |
a80ea340 | 210 | |
f5fa2007 TT |
211 | #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ |
212 | #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ | |
ca2634a4 | 213 | #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ |
f5fa2007 | 214 | |
df614db6 TT |
215 | /* |
216 | * Data structures used by the directory indexing feature | |
217 | * | |
218 | * Note: all of the multibyte integer fields are little endian. | |
219 | */ | |
220 | ||
221 | /* | |
222 | * Note: dx_root_info is laid out so that if it should somehow get | |
223 | * overlaid by a dirent the two low bits of the hash version will be | |
224 | * zero. Therefore, the hash version mod 4 should never be 0. | |
225 | * Sincerely, the paranoia department. | |
226 | */ | |
227 | struct ext2_dx_root_info { | |
228 | __u32 reserved_zero; | |
229 | __u8 hash_version; /* 0 now, 1 at release */ | |
230 | __u8 info_length; /* 8 */ | |
231 | __u8 indirect_levels; | |
232 | __u8 unused_flags; | |
233 | }; | |
234 | ||
f77704e4 TT |
235 | #define EXT2_HASH_LEGACY 0 |
236 | #define EXT2_HASH_HALF_MD4 1 | |
237 | #define EXT2_HASH_TEA 2 | |
238 | #define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ | |
239 | #define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ | |
240 | #define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ | |
503f9e7f TT |
241 | |
242 | #define EXT2_HASH_FLAG_INCOMPAT 0x1 | |
243 | ||
1d9ec88d LC |
244 | #define EXT4_DX_BLOCK_MASK 0x0fffffff |
245 | ||
df614db6 | 246 | struct ext2_dx_entry { |
1224c0d3 ES |
247 | __le32 hash; |
248 | __le32 block; | |
df614db6 TT |
249 | }; |
250 | ||
251 | struct ext2_dx_countlimit { | |
1224c0d3 ES |
252 | __le16 limit; |
253 | __le16 count; | |
df614db6 TT |
254 | }; |
255 | ||
5d914d72 DW |
256 | /* |
257 | * This goes at the end of each htree block. | |
258 | */ | |
259 | struct ext2_dx_tail { | |
1224c0d3 ES |
260 | __le32 dt_reserved; |
261 | __le32 dt_checksum; /* crc32c(uuid+inum+dxblock) */ | |
5d914d72 | 262 | }; |
df614db6 | 263 | |
9f8046fc TT |
264 | /* |
265 | * Macro-instructions used to manage group descriptors | |
266 | */ | |
f2de1d38 VC |
267 | #define EXT2_MIN_DESC_SIZE 32 |
268 | #define EXT2_MIN_DESC_SIZE_64BIT 64 | |
269 | #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE | |
270 | #define EXT2_DESC_SIZE(s) \ | |
271 | ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ | |
272 | (s)->s_desc_size : EXT2_MIN_DESC_SIZE) | |
273 | ||
b21bf267 AD |
274 | #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) |
275 | #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) | |
ae9e37cd | 276 | #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) |
b21bf267 AD |
277 | #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) |
278 | /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ | |
d32c915a | 279 | #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ |
ae9e37cd TT |
280 | (EXT2_CLUSTER_SIZE(s) / \ |
281 | EXT2_BLOCK_SIZE(s))) | |
d32c915a TT |
282 | #define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) |
283 | #define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ | |
284 | EXT2_INODES_PER_BLOCK(s)) | |
9f8046fc | 285 | #ifdef __KERNEL__ |
b21bf267 AD |
286 | #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) |
287 | #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) | |
9f8046fc | 288 | #else |
f2de1d38 | 289 | #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) |
9f8046fc TT |
290 | #endif |
291 | ||
1e33a8b4 TT |
292 | #define EXT2_GROUPS_TO_BLOCKS(s, g) ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \ |
293 | (g)) | |
294 | #define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \ | |
295 | (g)) | |
296 | ||
9f8046fc TT |
297 | /* |
298 | * Constants relative to the data blocks | |
299 | */ | |
0fbd1a8a AD |
300 | #define EXT2_NDIR_BLOCKS 12 |
301 | #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS | |
302 | #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) | |
303 | #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) | |
304 | #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) | |
9f8046fc TT |
305 | |
306 | /* | |
307 | * Inode flags | |
308 | */ | |
0fbd1a8a AD |
309 | #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ |
310 | #define EXT2_UNRM_FL 0x00000002 /* Undelete */ | |
311 | #define EXT2_COMPR_FL 0x00000004 /* Compress file */ | |
9f8046fc TT |
312 | #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ |
313 | #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
314 | #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ | |
315 | #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ | |
316 | #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ | |
317 | /* Reserved for compression usage... */ | |
318 | #define EXT2_DIRTY_FL 0x00000100 | |
319 | #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
0fbd1a8a | 320 | #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ |
22f22ab1 TT |
321 | /* nb: was previously EXT2_ECOMPR_FL */ |
322 | #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted inode */ | |
0fbd1a8a | 323 | /* End compression flags --- maybe not all used */ |
9f8046fc | 324 | #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ |
b10820cd | 325 | #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ |
9f8046fc TT |
326 | #define EXT2_IMAGIC_FL 0x00002000 |
327 | #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
b3f5b4c2 | 328 | #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
88372d5c | 329 | #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ |
15f9011a | 330 | #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
1ca1059f | 331 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
8fe81a3d | 332 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
faae7aa0 | 333 | #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ |
cff9690f | 334 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
010dc7b9 | 335 | /* EXT4_EOFBLOCKS_FL 0x00400000 was here */ |
0796e660 | 336 | #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ |
6d0ed678 TT |
337 | #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ |
338 | #define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ | |
339 | #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ | |
bf5dd0ae | 340 | #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data */ |
e1cec446 | 341 | #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ |
1378bb65 | 342 | #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */ |
9f8046fc TT |
343 | #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
344 | ||
1378bb65 GKB |
345 | #define EXT2_FL_USER_VISIBLE 0x604BDFFF /* User visible flags */ |
346 | #define EXT2_FL_USER_MODIFIABLE 0x604B80FF /* User modifiable flags */ | |
9f8046fc TT |
347 | |
348 | /* | |
349 | * ioctl commands | |
350 | */ | |
bf69235a TT |
351 | |
352 | /* Used for online resize */ | |
353 | struct ext2_new_group_input { | |
354 | __u32 group; /* Group number for this data */ | |
355 | __u32 block_bitmap; /* Absolute block number of block bitmap */ | |
356 | __u32 inode_bitmap; /* Absolute block number of inode bitmap */ | |
357 | __u32 inode_table; /* Absolute block number of inode table start */ | |
358 | __u32 blocks_count; /* Total number of blocks in this group */ | |
359 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
360 | __u16 unused; /* Number of reserved GDT blocks in group */ | |
361 | }; | |
362 | ||
5c4f8d67 TT |
363 | struct ext4_new_group_input { |
364 | __u32 group; /* Group number for this data */ | |
365 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
366 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
367 | __u64 inode_table; /* Absolute block number of inode table start */ | |
368 | __u32 blocks_count; /* Total number of blocks in this group */ | |
369 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
370 | __u16 unused; | |
371 | }; | |
372 | ||
3166c58d TT |
373 | #ifdef __GNU__ /* Needed for the Hurd */ |
374 | #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) | |
375 | #endif | |
376 | ||
0fbd1a8a AD |
377 | #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) |
378 | #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) | |
379 | #define EXT2_IOC_GETVERSION _IOR('v', 1, long) | |
380 | #define EXT2_IOC_SETVERSION _IOW('v', 2, long) | |
bf69235a TT |
381 | #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) |
382 | #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) | |
383 | #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) | |
384 | #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) | |
5c4f8d67 | 385 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) |
9f6ba888 | 386 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
9f8046fc TT |
387 | |
388 | /* | |
389 | * Structure of an inode on the disk | |
390 | */ | |
391 | struct ext2_inode { | |
27fc1ffb | 392 | /*00*/ __u16 i_mode; /* File mode */ |
9f8046fc TT |
393 | __u16 i_uid; /* Low 16 bits of Owner Uid */ |
394 | __u32 i_size; /* Size in bytes */ | |
395 | __u32 i_atime; /* Access time */ | |
6b3ce987 | 396 | __u32 i_ctime; /* Inode change time */ |
27fc1ffb | 397 | /*10*/ __u32 i_mtime; /* Modification time */ |
9f8046fc TT |
398 | __u32 i_dtime; /* Deletion Time */ |
399 | __u16 i_gid; /* Low 16 bits of Group Id */ | |
400 | __u16 i_links_count; /* Links count */ | |
401 | __u32 i_blocks; /* Blocks count */ | |
27fc1ffb | 402 | /*20*/ __u32 i_flags; /* File flags */ |
9f8046fc TT |
403 | union { |
404 | struct { | |
d362a3fb | 405 | __u32 l_i_version; /* was l_i_reserved1 */ |
9f8046fc TT |
406 | } linux1; |
407 | struct { | |
408 | __u32 h_i_translator; | |
409 | } hurd1; | |
9f8046fc | 410 | } osd1; /* OS dependent 1 */ |
27fc1ffb AD |
411 | /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
412 | /*64*/ __u32 i_generation; /* File version (for NFS) */ | |
9f8046fc | 413 | __u32 i_file_acl; /* File ACL */ |
578fcbfd | 414 | __u32 i_size_high; |
27fc1ffb | 415 | /*70*/ __u32 i_faddr; /* Fragment address */ |
9f8046fc TT |
416 | union { |
417 | struct { | |
5d17119d | 418 | __u16 l_i_blocks_hi; |
bb767b2f | 419 | __u16 l_i_file_acl_high; |
9f8046fc TT |
420 | __u16 l_i_uid_high; /* these 2 fields */ |
421 | __u16 l_i_gid_high; /* were reserved2[0] */ | |
ae96c678 TT |
422 | __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ |
423 | __u16 l_i_reserved; | |
9f8046fc TT |
424 | } linux2; |
425 | struct { | |
426 | __u8 h_i_frag; /* Fragment number */ | |
427 | __u8 h_i_fsize; /* Fragment size */ | |
428 | __u16 h_i_mode_high; | |
429 | __u16 h_i_uid_high; | |
430 | __u16 h_i_gid_high; | |
431 | __u32 h_i_author; | |
432 | } hurd2; | |
9f8046fc TT |
433 | } osd2; /* OS dependent 2 */ |
434 | }; | |
435 | ||
7331196a TT |
436 | /* |
437 | * Permanent part of an large inode on the disk | |
438 | */ | |
439 | struct ext2_inode_large { | |
27fc1ffb | 440 | /*00*/ __u16 i_mode; /* File mode */ |
7331196a TT |
441 | __u16 i_uid; /* Low 16 bits of Owner Uid */ |
442 | __u32 i_size; /* Size in bytes */ | |
443 | __u32 i_atime; /* Access time */ | |
6b3ce987 | 444 | __u32 i_ctime; /* Inode Change time */ |
27fc1ffb | 445 | /*10*/ __u32 i_mtime; /* Modification time */ |
7331196a TT |
446 | __u32 i_dtime; /* Deletion Time */ |
447 | __u16 i_gid; /* Low 16 bits of Group Id */ | |
448 | __u16 i_links_count; /* Links count */ | |
449 | __u32 i_blocks; /* Blocks count */ | |
27fc1ffb | 450 | /*20*/ __u32 i_flags; /* File flags */ |
7331196a TT |
451 | union { |
452 | struct { | |
d362a3fb | 453 | __u32 l_i_version; /* was l_i_reserved1 */ |
7331196a TT |
454 | } linux1; |
455 | struct { | |
456 | __u32 h_i_translator; | |
457 | } hurd1; | |
7331196a | 458 | } osd1; /* OS dependent 1 */ |
27fc1ffb AD |
459 | /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
460 | /*64*/ __u32 i_generation; /* File version (for NFS) */ | |
7331196a | 461 | __u32 i_file_acl; /* File ACL */ |
578fcbfd | 462 | __u32 i_size_high; |
27fc1ffb | 463 | /*70*/ __u32 i_faddr; /* Fragment address */ |
7331196a TT |
464 | union { |
465 | struct { | |
5d17119d | 466 | __u16 l_i_blocks_hi; |
bb767b2f | 467 | __u16 l_i_file_acl_high; |
7331196a TT |
468 | __u16 l_i_uid_high; /* these 2 fields */ |
469 | __u16 l_i_gid_high; /* were reserved2[0] */ | |
89efc88e TT |
470 | __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ |
471 | __u16 l_i_reserved; | |
7331196a TT |
472 | } linux2; |
473 | struct { | |
474 | __u8 h_i_frag; /* Fragment number */ | |
475 | __u8 h_i_fsize; /* Fragment size */ | |
476 | __u16 h_i_mode_high; | |
477 | __u16 h_i_uid_high; | |
478 | __u16 h_i_gid_high; | |
479 | __u32 h_i_author; | |
480 | } hurd2; | |
7331196a | 481 | } osd2; /* OS dependent 2 */ |
27fc1ffb | 482 | /*80*/ __u16 i_extra_isize; |
89efc88e | 483 | __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */ |
6b3ce987 TT |
484 | __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
485 | __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ | |
486 | __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
27fc1ffb | 487 | /*90*/ __u32 i_crtime; /* File creation time */ |
6b3ce987 | 488 | __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ |
bb767b2f | 489 | __u32 i_version_hi; /* high 32 bits for 64-bit version */ |
27fc1ffb | 490 | /*9c*/ __u32 i_projid; /* Project ID */ |
7331196a TT |
491 | }; |
492 | ||
37d82b6a DW |
493 | #define EXT4_INODE_CSUM_HI_EXTRA_END \ |
494 | (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \ | |
495 | EXT2_GOOD_OLD_INODE_SIZE) | |
496 | ||
082ed5dc DT |
497 | #define EXT4_EPOCH_BITS 2 |
498 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
499 | ||
ae67aaac TT |
500 | #define i_checksum_lo osd2.linux2.l_i_checksum_lo |
501 | ||
080e09b4 LX |
502 | #define inode_includes(size, field) \ |
503 | (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \ | |
504 | offsetof(struct ext2_inode_large, field))) | |
505 | ||
9f8046fc TT |
506 | #if defined(__KERNEL__) || defined(__linux__) |
507 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
508 | #define i_frag osd2.linux2.l_i_frag | |
509 | #define i_fsize osd2.linux2.l_i_fsize | |
510 | #define i_uid_low i_uid | |
511 | #define i_gid_low i_gid | |
512 | #define i_uid_high osd2.linux2.l_i_uid_high | |
513 | #define i_gid_high osd2.linux2.l_i_gid_high | |
48e6e813 TT |
514 | #else |
515 | #if defined(__GNU__) | |
9f8046fc TT |
516 | |
517 | #define i_translator osd1.hurd1.h_i_translator | |
518 | #define i_frag osd2.hurd2.h_i_frag; | |
519 | #define i_fsize osd2.hurd2.h_i_fsize; | |
520 | #define i_uid_high osd2.hurd2.h_i_uid_high | |
521 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
522 | #define i_author osd2.hurd2.h_i_author | |
523 | ||
48e6e813 | 524 | #endif /* __GNU__ */ |
7da78ff1 | 525 | #endif /* defined(__KERNEL__) || defined(__linux__) */ |
9f8046fc | 526 | |
7132d48d TT |
527 | #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) |
528 | #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) | |
080e09b4 | 529 | #define inode_projid(inode) ((inode).i_projid) |
15343922 TT |
530 | #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) |
531 | #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) | |
33068611 | 532 | |
bc1ec4b4 TT |
533 | static inline |
534 | struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode) | |
535 | { | |
536 | return (struct ext2_inode *) large_inode; | |
537 | } | |
538 | ||
9f8046fc TT |
539 | /* |
540 | * File system states | |
541 | */ | |
0fbd1a8a AD |
542 | #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ |
543 | #define EXT2_ERROR_FS 0x0002 /* Errors detected */ | |
a80f3694 | 544 | #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ |
9f8046fc | 545 | |
f77704e4 TT |
546 | /* |
547 | * Misc. filesystem flags | |
548 | */ | |
549 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
550 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
6cb27404 | 551 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ |
6d0ed678 TT |
552 | #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ |
553 | #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ | |
554 | #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ | |
f77704e4 | 555 | |
9f8046fc TT |
556 | /* |
557 | * Mount flags | |
558 | */ | |
559 | #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ | |
560 | #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ | |
561 | #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ | |
562 | #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ | |
563 | #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ | |
564 | #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ | |
565 | #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ | |
566 | #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ | |
567 | ||
568 | #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt | |
569 | #define set_opt(o, opt) o |= EXT2_MOUNT_##opt | |
0fbd1a8a | 570 | #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ |
9f8046fc TT |
571 | EXT2_MOUNT_##opt) |
572 | /* | |
573 | * Maximal mount counts between two filesystem checks | |
574 | */ | |
575 | #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ | |
576 | #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
577 | ||
578 | /* | |
579 | * Behaviour when detecting errors | |
580 | */ | |
581 | #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ | |
582 | #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ | |
583 | #define EXT2_ERRORS_PANIC 3 /* Panic */ | |
584 | #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE | |
585 | ||
993988f6 TT |
586 | #if (__GNUC__ >= 4) |
587 | #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) | |
588 | #else | |
589 | #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) | |
590 | #endif | |
591 | ||
5d914d72 DW |
592 | /* Metadata checksum algorithms */ |
593 | #define EXT2_CRC32C_CHKSUM 1 | |
594 | ||
bfa4b350 | 595 | /* Encryption algorithms, key size and key reference len */ |
22f22ab1 TT |
596 | #define EXT4_ENCRYPTION_MODE_INVALID 0 |
597 | #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 | |
598 | #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 | |
599 | #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 | |
f7257a93 | 600 | #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 |
22f22ab1 | 601 | |
bfa4b350 IM |
602 | #define EXT4_AES_256_XTS_KEY_SIZE 64 |
603 | #define EXT4_AES_256_GCM_KEY_SIZE 32 | |
604 | #define EXT4_AES_256_CBC_KEY_SIZE 32 | |
f7257a93 | 605 | #define EXT4_AES_256_CTS_KEY_SIZE 32 |
bfa4b350 IM |
606 | #define EXT4_MAX_KEY_SIZE 64 |
607 | ||
608 | #define EXT4_KEY_DESCRIPTOR_SIZE 8 | |
e3dd5c6f | 609 | #define EXT4_CRYPTO_BLOCK_SIZE 16 |
bfa4b350 IM |
610 | |
611 | /* Password derivation constants */ | |
612 | #define EXT4_MAX_PASSPHRASE_SIZE 1024 | |
613 | #define EXT4_MAX_SALT_SIZE 256 | |
614 | #define EXT4_PBKDF2_ITERATIONS 0xFFFF | |
615 | ||
2832fd8b TT |
616 | #define EXT2_LABEL_LEN 16 |
617 | ||
bfa4b350 IM |
618 | /* |
619 | * Policy provided via an ioctl on the topmost directory. This | |
620 | * structure is also in the kernel. | |
621 | */ | |
622 | struct ext4_encryption_policy { | |
623 | char version; | |
624 | char contents_encryption_mode; | |
625 | char filenames_encryption_mode; | |
437651ad | 626 | char flags; |
bfa4b350 IM |
627 | char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE]; |
628 | } __attribute__((__packed__)); | |
629 | ||
630 | struct ext4_encryption_key { | |
631 | __u32 mode; | |
632 | char raw[EXT4_MAX_KEY_SIZE]; | |
633 | __u32 size; | |
634 | } __attribute__((__packed__)); | |
635 | ||
9f8046fc TT |
636 | /* |
637 | * Structure of the super block | |
638 | */ | |
639 | struct ext2_super_block { | |
27fc1ffb | 640 | /*000*/ __u32 s_inodes_count; /* Inodes count */ |
9f8046fc TT |
641 | __u32 s_blocks_count; /* Blocks count */ |
642 | __u32 s_r_blocks_count; /* Reserved blocks count */ | |
643 | __u32 s_free_blocks_count; /* Free blocks count */ | |
27fc1ffb | 644 | /*010*/ __u32 s_free_inodes_count; /* Free inodes count */ |
9f8046fc TT |
645 | __u32 s_first_data_block; /* First Data Block */ |
646 | __u32 s_log_block_size; /* Block size */ | |
4df16182 | 647 | __u32 s_log_cluster_size; /* Allocation cluster size */ |
27fc1ffb | 648 | /*020*/ __u32 s_blocks_per_group; /* # Blocks per group */ |
412376ef | 649 | __u32 s_clusters_per_group; /* # Fragments per group */ |
9f8046fc TT |
650 | __u32 s_inodes_per_group; /* # Inodes per group */ |
651 | __u32 s_mtime; /* Mount time */ | |
27fc1ffb | 652 | /*030*/ __u32 s_wtime; /* Write time */ |
9f8046fc TT |
653 | __u16 s_mnt_count; /* Mount count */ |
654 | __s16 s_max_mnt_count; /* Maximal mount count */ | |
655 | __u16 s_magic; /* Magic signature */ | |
656 | __u16 s_state; /* File system state */ | |
657 | __u16 s_errors; /* Behaviour when detecting errors */ | |
0fbd1a8a | 658 | __u16 s_minor_rev_level; /* minor revision level */ |
27fc1ffb | 659 | /*040*/ __u32 s_lastcheck; /* time of last check */ |
9f8046fc TT |
660 | __u32 s_checkinterval; /* max. time between checks */ |
661 | __u32 s_creator_os; /* OS */ | |
662 | __u32 s_rev_level; /* Revision level */ | |
27fc1ffb | 663 | /*050*/ __u16 s_def_resuid; /* Default uid for reserved blocks */ |
9f8046fc TT |
664 | __u16 s_def_resgid; /* Default gid for reserved blocks */ |
665 | /* | |
666 | * These fields are for EXT2_DYNAMIC_REV superblocks only. | |
667 | * | |
668 | * Note: the difference between the compatible feature set and | |
669 | * the incompatible feature set is that if there is a bit set | |
670 | * in the incompatible feature set that the kernel doesn't | |
671 | * know about, it should refuse to mount the filesystem. | |
0fbd1a8a | 672 | * |
9f8046fc TT |
673 | * e2fsck's requirements are more strict; if it doesn't know |
674 | * about a feature in either the compatible or incompatible | |
675 | * feature set, it must abort and not try to meddle with | |
676 | * things it doesn't understand... | |
677 | */ | |
0fbd1a8a AD |
678 | __u32 s_first_ino; /* First non-reserved inode */ |
679 | __u16 s_inode_size; /* size of inode structure */ | |
680 | __u16 s_block_group_nr; /* block group # of this superblock */ | |
681 | __u32 s_feature_compat; /* compatible feature set */ | |
27fc1ffb | 682 | /*060*/ __u32 s_feature_incompat; /* incompatible feature set */ |
0fbd1a8a | 683 | __u32 s_feature_ro_compat; /* readonly-compatible feature set */ |
27fc1ffb AD |
684 | /*068*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
685 | /*078*/ char s_volume_name[EXT2_LABEL_LEN]; /* volume name */ | |
686 | /*088*/ char s_last_mounted[64]; /* directory where last mounted */ | |
687 | /*0c8*/ __u32 s_algorithm_usage_bitmap; /* For compression */ | |
9f8046fc TT |
688 | /* |
689 | * Performance hints. Directory preallocation should only | |
690 | * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. | |
691 | */ | |
692 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
693 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
9e6c5dd7 | 694 | __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ |
0fbd1a8a | 695 | /* |
9f8046fc TT |
696 | * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. |
697 | */ | |
27fc1ffb AD |
698 | /*0d0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
699 | /*0e0*/ __u32 s_journal_inum; /* inode number of journal file */ | |
9f8046fc TT |
700 | __u32 s_journal_dev; /* device number of journal file */ |
701 | __u32 s_last_orphan; /* start of list of inodes to delete */ | |
27fc1ffb AD |
702 | /*0ec*/ __u32 s_hash_seed[4]; /* HTREE hash seed */ |
703 | /*0fc*/ __u8 s_def_hash_version; /* Default hash version to use */ | |
704 | __u8 s_jnl_backup_type; /* Default type of journal backup */ | |
8061d2c1 | 705 | __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ |
27fc1ffb | 706 | /*100*/ __u32 s_default_mount_opts; /* default EXT2_MOUNT_* flags used */ |
c046ac7f | 707 | __u32 s_first_meta_bg; /* First metablock group */ |
9d2aefb3 | 708 | __u32 s_mkfs_time; /* When the filesystem was created */ |
27fc1ffb AD |
709 | /*10c*/ __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ |
710 | /*150*/ __u32 s_blocks_count_hi; /* Blocks count high 32bits */ | |
8061d2c1 | 711 | __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ |
27fc1ffb | 712 | __u32 s_free_blocks_hi; /* Free blocks count */ |
6b3ce987 | 713 | __u16 s_min_extra_isize; /* All inodes have at least # bytes */ |
27fc1ffb AD |
714 | __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ |
715 | /*160*/ __u32 s_flags; /* Miscellaneous flags */ | |
716 | __u16 s_raid_stride; /* RAID stride in blocks */ | |
717 | __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ | |
718 | __u64 s_mmp_block; /* Block for multi-mount protection */ | |
719 | /*170*/ __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
494a1daa | 720 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
27fc1ffb | 721 | __u8 s_checksum_type; /* metadata checksum algorithm */ |
fc898cb9 TT |
722 | __u8 s_encryption_level; /* versioning level for encryption */ |
723 | __u8 s_reserved_pad; /* Padding to next 32bits */ | |
b7c5b403 | 724 | __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
27fc1ffb | 725 | /*180*/ __u32 s_snapshot_inum; /* Inode number of active snapshot */ |
6d0ed678 | 726 | __u32 s_snapshot_id; /* sequential ID of active snapshot */ |
27fc1ffb AD |
727 | __u64 s_snapshot_r_blocks_count; /* active snapshot reserved blocks */ |
728 | /*190*/ __u32 s_snapshot_list; /* inode number of disk snapshot list */ | |
993988f6 TT |
729 | #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) |
730 | __u32 s_error_count; /* number of fs errors */ | |
731 | __u32 s_first_error_time; /* first time an error happened */ | |
732 | __u32 s_first_error_ino; /* inode involved in first error */ | |
27fc1ffb | 733 | /*1a0*/ __u64 s_first_error_block; /* block involved in first error */ |
993988f6 | 734 | __u8 s_first_error_func[32]; /* function where the error happened */ |
27fc1ffb | 735 | /*1c8*/ __u32 s_first_error_line; /* line number where error happened */ |
993988f6 | 736 | __u32 s_last_error_time; /* most recent time of an error */ |
27fc1ffb | 737 | /*1d0*/ __u32 s_last_error_ino; /* inode involved in last error */ |
993988f6 TT |
738 | __u32 s_last_error_line; /* line number where error happened */ |
739 | __u64 s_last_error_block; /* block involved of last error */ | |
27fc1ffb | 740 | /*1e0*/ __u8 s_last_error_func[32]; /* function where the error happened */ |
9345f026 | 741 | #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) |
27fc1ffb AD |
742 | /*200*/ __u8 s_mount_opts[64]; |
743 | /*240*/ __u32 s_usr_quota_inum; /* inode number of user quota file */ | |
0edcc270 | 744 | __u32 s_grp_quota_inum; /* inode number of group quota file */ |
4df16182 | 745 | __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ |
27fc1ffb AD |
746 | /*24c*/ __u32 s_backup_bgs[2]; /* If sparse_super2 enabled */ |
747 | /*254*/ __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ | |
748 | /*258*/ __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ | |
749 | /*268*/ __le32 s_lpf_ino; /* Location of the lost+found inode */ | |
080e09b4 | 750 | __le32 s_prj_quota_inum; /* inode for tracking project quota */ |
27fc1ffb | 751 | /*270*/ __le32 s_checksum_seed; /* crc32c(orig_uuid) if csum_seed set */ |
e39f507a GKB |
752 | /*274*/ __u8 s_wtime_hi; |
753 | __u8 s_mtime_hi; | |
754 | __u8 s_mkfs_time_hi; | |
755 | __u8 s_lastcheck_hi; | |
756 | __u8 s_first_error_time_hi; | |
757 | __u8 s_last_error_time_hi; | |
758 | __u8 s_pad[2]; | |
44a1d8b9 GKB |
759 | /*27c*/ __le16 s_encoding; /* Filename charset encoding */ |
760 | __le16 s_encoding_flags; /* Filename charset encoding flags */ | |
761 | __le32 s_reserved[95]; /* Padding to the end of the block */ | |
27fc1ffb | 762 | /*3fc*/ __u32 s_checksum; /* crc32c(superblock) */ |
9f8046fc TT |
763 | }; |
764 | ||
993988f6 TT |
765 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
766 | ||
9f8046fc TT |
767 | /* |
768 | * Codes for operating systems | |
769 | */ | |
770 | #define EXT2_OS_LINUX 0 | |
771 | #define EXT2_OS_HURD 1 | |
c9548bc3 | 772 | #define EXT2_OBSO_OS_MASIX 2 |
9f8046fc TT |
773 | #define EXT2_OS_FREEBSD 3 |
774 | #define EXT2_OS_LITES 4 | |
775 | ||
776 | /* | |
777 | * Revision levels | |
778 | */ | |
779 | #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ | |
0fbd1a8a | 780 | #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
9f8046fc TT |
781 | |
782 | #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV | |
783 | #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV | |
784 | ||
785 | #define EXT2_GOOD_OLD_INODE_SIZE 128 | |
786 | ||
a435ec34 TT |
787 | /* |
788 | * Journal inode backup types | |
789 | */ | |
790 | #define EXT3_JNL_BACKUP_BLOCKS 1 | |
791 | ||
9f8046fc TT |
792 | /* |
793 | * Feature set definitions | |
794 | */ | |
795 | ||
796 | #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ | |
797 | ( EXT2_SB(sb)->s_feature_compat & (mask) ) | |
798 | #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ | |
799 | ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) | |
800 | #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ | |
801 | ( EXT2_SB(sb)->s_feature_incompat & (mask) ) | |
802 | ||
803 | #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
804 | #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
805 | #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
b10820cd | 806 | #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 |
9f8046fc | 807 | #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 |
b10820cd | 808 | #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 |
f5fa2007 | 809 | #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 |
89efc88e TT |
810 | /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */ |
811 | #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 | |
65c6c3e0 | 812 | #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 |
89efc88e | 813 | |
9f8046fc TT |
814 | |
815 | #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
816 | #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
2c93113e | 817 | /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ |
5d17119d | 818 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
8815fb8a | 819 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
bec6f49a | 820 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
6b3ce987 | 821 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
6d0ed678 | 822 | #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 |
0edcc270 | 823 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
412376ef | 824 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
5d914d72 DW |
825 | /* |
826 | * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group | |
827 | * descriptor checksums use the same algorithm as all other data | |
828 | * structures' checksums. | |
829 | */ | |
89efc88e | 830 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
991211f6 | 831 | #define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800 |
8b39e4cf | 832 | #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 |
0c18d036 | 833 | #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 /* Project quota */ |
611d3413 | 834 | #define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000 |
faae7aa0 | 835 | #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 |
9f8046fc TT |
836 | |
837 | #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
838 | #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
839 | #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
840 | #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
c046ac7f | 841 | #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 |
39dc1c45 | 842 | #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 |
8061d2c1 | 843 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
b62e88af | 844 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
cf0eeec0 | 845 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
cff9690f | 846 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 |
30a7610e | 847 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 |
2ed0adbc | 848 | #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 |
660b4c3b | 849 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ |
94846158 | 850 | #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ |
22f22ab1 | 851 | #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 |
44a1d8b9 | 852 | #define EXT4_FEATURE_INCOMPAT_FNAME_ENCODING 0x20000 |
39dc1c45 | 853 | |
77b3e987 DW |
854 | #define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \ |
855 | static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ | |
856 | { \ | |
857 | return ((EXT2_SB(sb)->s_feature_compat & \ | |
858 | EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \ | |
859 | } \ | |
860 | static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ | |
861 | { \ | |
862 | EXT2_SB(sb)->s_feature_compat |= \ | |
863 | EXT##ver##_FEATURE_COMPAT_##flagname; \ | |
864 | } \ | |
865 | static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ | |
866 | { \ | |
867 | EXT2_SB(sb)->s_feature_compat &= \ | |
868 | ~EXT##ver##_FEATURE_COMPAT_##flagname; \ | |
869 | } | |
870 | ||
871 | #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \ | |
872 | static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ | |
873 | { \ | |
874 | return ((EXT2_SB(sb)->s_feature_ro_compat & \ | |
875 | EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \ | |
876 | } \ | |
877 | static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ | |
878 | { \ | |
879 | EXT2_SB(sb)->s_feature_ro_compat |= \ | |
880 | EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ | |
881 | } \ | |
882 | static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ | |
883 | { \ | |
884 | EXT2_SB(sb)->s_feature_ro_compat &= \ | |
885 | ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ | |
886 | } | |
887 | ||
888 | #define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \ | |
889 | static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ | |
890 | { \ | |
891 | return ((EXT2_SB(sb)->s_feature_incompat & \ | |
892 | EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \ | |
893 | } \ | |
894 | static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ | |
895 | { \ | |
896 | EXT2_SB(sb)->s_feature_incompat |= \ | |
897 | EXT##ver##_FEATURE_INCOMPAT_##flagname; \ | |
898 | } \ | |
899 | static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ | |
900 | { \ | |
901 | EXT2_SB(sb)->s_feature_incompat &= \ | |
902 | ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \ | |
903 | } | |
904 | ||
905 | EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC) | |
906 | EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES) | |
907 | EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL) | |
908 | EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR) | |
909 | EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE) | |
910 | EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX) | |
911 | EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG) | |
912 | EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP) | |
913 | EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2) | |
914 | ||
915 | EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER) | |
916 | EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE) | |
917 | EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE) | |
918 | EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM) | |
919 | EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK) | |
920 | EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE) | |
921 | EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT) | |
922 | EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA) | |
923 | EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC) | |
924 | EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM) | |
925 | EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA) | |
926 | EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY) | |
0c18d036 | 927 | EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT) |
611d3413 | 928 | EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS) |
faae7aa0 | 929 | EXT4_FEATURE_RO_COMPAT_FUNCS(verity, 4, VERITY) |
77b3e987 DW |
930 | |
931 | EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION) | |
932 | EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE) | |
933 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER) | |
934 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV) | |
935 | EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG) | |
936 | EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS) | |
937 | EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT) | |
938 | EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP) | |
939 | EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG) | |
940 | EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE) | |
941 | EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA) | |
2ed0adbc | 942 | EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED) |
77b3e987 DW |
943 | EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR) |
944 | EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA) | |
945 | EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT) | |
44a1d8b9 | 946 | EXT4_FEATURE_INCOMPAT_FUNCS(fname_encoding, 4, FNAME_ENCODING) |
77b3e987 | 947 | |
9f8046fc | 948 | #define EXT2_FEATURE_COMPAT_SUPP 0 |
0f5eba75 | 949 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ |
3f0cf647 | 950 | EXT4_FEATURE_INCOMPAT_MMP| \ |
6a081f6d AD |
951 | EXT4_FEATURE_INCOMPAT_LARGEDIR| \ |
952 | EXT4_FEATURE_INCOMPAT_EA_INODE) | |
9f8046fc TT |
953 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
954 | EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
a7c9cb7d | 955 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ |
faae7aa0 TT |
956 | EXT2_FEATURE_RO_COMPAT_BTREE_DIR| \ |
957 | EXT4_FEATURE_RO_COMPAT_VERITY) | |
9f8046fc TT |
958 | |
959 | /* | |
960 | * Default values for user and/or group using reserved blocks | |
961 | */ | |
0fbd1a8a AD |
962 | #define EXT2_DEF_RESUID 0 |
963 | #define EXT2_DEF_RESGID 0 | |
9f8046fc | 964 | |
a0c3fd5e TT |
965 | /* |
966 | * Default mount options | |
967 | */ | |
968 | #define EXT2_DEFM_DEBUG 0x0001 | |
969 | #define EXT2_DEFM_BSDGROUPS 0x0002 | |
970 | #define EXT2_DEFM_XATTR_USER 0x0004 | |
971 | #define EXT2_DEFM_ACL 0x0008 | |
972 | #define EXT2_DEFM_UID16 0x0010 | |
efc6f628 | 973 | #define EXT3_DEFM_JMODE 0x0060 |
4a959fe6 TT |
974 | #define EXT3_DEFM_JMODE_DATA 0x0020 |
975 | #define EXT3_DEFM_JMODE_ORDERED 0x0040 | |
976 | #define EXT3_DEFM_JMODE_WBACK 0x0060 | |
9345f026 TT |
977 | #define EXT4_DEFM_NOBARRIER 0x0100 |
978 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 | |
979 | #define EXT4_DEFM_DISCARD 0x0400 | |
980 | #define EXT4_DEFM_NODELALLOC 0x0800 | |
a0c3fd5e | 981 | |
9f8046fc TT |
982 | /* |
983 | * Structure of a directory entry | |
984 | */ | |
985 | #define EXT2_NAME_LEN 255 | |
986 | ||
987 | struct ext2_dir_entry { | |
988 | __u32 inode; /* Inode number */ | |
989 | __u16 rec_len; /* Directory entry length */ | |
990 | __u16 name_len; /* Name length */ | |
991 | char name[EXT2_NAME_LEN]; /* File name */ | |
992 | }; | |
993 | ||
994 | /* | |
995 | * The new version of the directory entry. Since EXT2 structures are | |
996 | * stored in intel byte order, and the name_len field could never be | |
997 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
998 | * file_type field. | |
70f4632b | 999 | * |
055866d8 | 1000 | * This structure is deprecated due to endian issues. Please use struct |
70f4632b JK |
1001 | * ext2_dir_entry and accessor functions |
1002 | * ext2fs_dirent_name_len | |
1003 | * ext2fs_dirent_set_name_len | |
1004 | * ext2fs_dirent_file_type | |
1005 | * ext2fs_dirent_set_file_type | |
1006 | * to get and set name_len and file_type fields. | |
9f8046fc TT |
1007 | */ |
1008 | struct ext2_dir_entry_2 { | |
1009 | __u32 inode; /* Inode number */ | |
1010 | __u16 rec_len; /* Directory entry length */ | |
1011 | __u8 name_len; /* Name length */ | |
1012 | __u8 file_type; | |
1013 | char name[EXT2_NAME_LEN]; /* File name */ | |
1014 | }; | |
1015 | ||
5d914d72 DW |
1016 | /* |
1017 | * This is a bogus directory entry at the end of each leaf block that | |
1018 | * records checksums. | |
1019 | */ | |
1020 | struct ext2_dir_entry_tail { | |
1021 | __u32 det_reserved_zero1; /* Pretend to be unused */ | |
1022 | __u16 det_rec_len; /* 12 */ | |
1023 | __u16 det_reserved_name_len; /* 0xDE00, fake namelen/filetype */ | |
1024 | __u32 det_checksum; /* crc32c(uuid+inode+dirent) */ | |
1025 | }; | |
1026 | ||
9f8046fc TT |
1027 | /* |
1028 | * Ext2 directory file types. Only the low 3 bits are used. The | |
1029 | * other bits are reserved for now. | |
1030 | */ | |
1031 | #define EXT2_FT_UNKNOWN 0 | |
1032 | #define EXT2_FT_REG_FILE 1 | |
1033 | #define EXT2_FT_DIR 2 | |
1034 | #define EXT2_FT_CHRDEV 3 | |
0fbd1a8a | 1035 | #define EXT2_FT_BLKDEV 4 |
9f8046fc TT |
1036 | #define EXT2_FT_FIFO 5 |
1037 | #define EXT2_FT_SOCK 6 | |
1038 | #define EXT2_FT_SYMLINK 7 | |
1039 | ||
1040 | #define EXT2_FT_MAX 8 | |
1041 | ||
5d914d72 DW |
1042 | /* |
1043 | * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we | |
1044 | * have to build ext2_dir_entry_tail with that assumption too. This | |
1045 | * constant helps to build the dir_entry_tail to look like it has an | |
1046 | * "invalid" file type. | |
1047 | */ | |
1048 | #define EXT2_DIR_NAME_LEN_CSUM 0xDE00 | |
1049 | ||
9f8046fc TT |
1050 | /* |
1051 | * EXT2_DIR_PAD defines the directory entries boundaries | |
1052 | * | |
1053 | * NOTE: It must be a multiple of 4 | |
1054 | */ | |
4a3dc1f0 | 1055 | #define EXT2_DIR_ENTRY_HEADER_LEN 8 |
0fbd1a8a AD |
1056 | #define EXT2_DIR_PAD 4 |
1057 | #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) | |
4a3dc1f0 DW |
1058 | #define EXT2_DIR_REC_LEN(name_len) (((name_len) + \ |
1059 | EXT2_DIR_ENTRY_HEADER_LEN + \ | |
1060 | EXT2_DIR_ROUND) & \ | |
9f8046fc TT |
1061 | ~EXT2_DIR_ROUND) |
1062 | ||
188960ea TT |
1063 | /* |
1064 | * Constants for ext4's extended time encoding | |
1065 | */ | |
1066 | #define EXT4_EPOCH_BITS 2 | |
1067 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
1068 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
1069 | ||
b62e88af | 1070 | /* |
0f5eba75 AD |
1071 | * This structure is used for multiple mount protection. It is written |
1072 | * into the block number saved in the s_mmp_block field in the superblock. | |
1073 | * Programs that check MMP should assume that if SEQ_FSCK (or any unknown | |
1074 | * code above SEQ_MAX) is present then it is NOT safe to use the filesystem, | |
1075 | * regardless of how old the timestamp is. | |
1076 | * | |
1077 | * The timestamp in the MMP structure will be updated by e2fsck at some | |
055866d8 | 1078 | * arbitrary intervals (start of passes, after every few groups of inodes |
0f5eba75 AD |
1079 | * in pass1 and pass1b). There is no guarantee that e2fsck is updating |
1080 | * the MMP block in a timely manner, and the updates it does are purely | |
1081 | * for the convenience of the sysadmin and not for automatic validation. | |
1082 | * | |
1083 | * Note: Only the mmp_seq value is used to determine whether the MMP block | |
1084 | * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname | |
1085 | * fields are only for informational purposes for the administrator, | |
1086 | * due to clock skew between nodes and hostname HA service takeover. | |
b62e88af | 1087 | */ |
0f5eba75 AD |
1088 | #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ |
1089 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ | |
1090 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ | |
1091 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ | |
b62e88af | 1092 | |
1224c0d3 | 1093 | /* Not endian-annotated; it's swapped at read/write time */ |
b62e88af | 1094 | struct mmp_struct { |
0f5eba75 AD |
1095 | __u32 mmp_magic; /* Magic number for MMP */ |
1096 | __u32 mmp_seq; /* Sequence no. updated periodically */ | |
1097 | __u64 mmp_time; /* Time last updated */ | |
1098 | char mmp_nodename[64]; /* Node which last updated MMP block */ | |
1099 | char mmp_bdevname[32]; /* Bdev which last updated MMP block */ | |
1100 | __u16 mmp_check_interval; /* Changed mmp_check_interval */ | |
b62e88af | 1101 | __u16 mmp_pad1; |
5d914d72 DW |
1102 | __u32 mmp_pad2[226]; |
1103 | __u32 mmp_checksum; /* crc32c(uuid+mmp_block) */ | |
b62e88af AD |
1104 | }; |
1105 | ||
1106 | /* | |
0f5eba75 AD |
1107 | * Default interval for MMP update in seconds. |
1108 | */ | |
1109 | #define EXT4_MMP_UPDATE_INTERVAL 5 | |
1110 | ||
1111 | /* | |
1112 | * Maximum interval for MMP update in seconds. | |
1113 | */ | |
1114 | #define EXT4_MMP_MAX_UPDATE_INTERVAL 300 | |
1115 | ||
1116 | /* | |
1117 | * Minimum interval for MMP checking in seconds. | |
b62e88af | 1118 | */ |
0f5eba75 | 1119 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5 |
b62e88af | 1120 | |
416c1de9 ZL |
1121 | /* |
1122 | * Minimum size of inline data. | |
1123 | */ | |
1124 | #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) * EXT2_N_BLOCKS)) | |
1125 | ||
1126 | /* | |
1127 | * Size of a parent inode in inline data directory. | |
1128 | */ | |
1129 | #define EXT4_INLINE_DATA_DOTDOT_SIZE (4) | |
1130 | ||
d85c5a61 GKB |
1131 | #define EXT4_ENC_ASCII 0 |
1132 | #define EXT4_ENC_UTF8_11_0 1 | |
1133 | ||
1134 | #define EXT4_ENC_STRICT_MODE_FL (1 << 0) /* Reject invalid sequences */ | |
1135 | #define EXT4_UTF8_NORMALIZATION_TYPE_NFKD (1 << 1) | |
1136 | #define EXT4_UTF8_CASEFOLD_TYPE_NFKDCF (1 << 4) | |
1137 | ||
9f8046fc | 1138 | #endif /* _LINUX_EXT2_FS_H */ |