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 <ext2fs/ext2_types.h> /* Changed from linux/types.h */
20
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
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 /*
52 * Special inode numbers
53 */
54 #define EXT2_BAD_INO 1 /* Bad blocks inode */
55 #define EXT2_ROOT_INO 2 /* Root inode */
56 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
57 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
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 */
62 #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */
63 #define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */
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
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
82 /*
83 * Maximal count of links to a file
84 */
85 #define EXT2_LINK_MAX 65000
86
87 /*
88 * Macro-instructions used to manage several block sizes
89 */
90 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */
91 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */
92 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE)
93 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE)
94 #ifdef __KERNEL__
95 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
96 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
97 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits)
98 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
99 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
100 #else
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)
103 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
104 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
105 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
106 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
107 #endif
108 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
109
110 /*
111 * Macro-instructions used to manage allocation clusters
112 */
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)
120
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
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 {
160 __u32 bg_block_bitmap; /* Blocks bitmap block */
161 __u32 bg_inode_bitmap; /* Inodes bitmap block */
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 */
166 __u16 bg_flags;
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 */
170 __u16 bg_itable_unused; /* Unused inodes count */
171 __u16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/
172 };
173
174 /*
175 * Structure of a blocks group descriptor
176 */
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 */
185 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
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 */
189 __u16 bg_itable_unused; /* Unused inodes count */
190 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */
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 */
197 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */
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;
202 };
203
204 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
205 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
206 sizeof(__u16))
207 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION \
208 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
209 sizeof(__u16))
210
211 #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */
212 #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */
213 #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
214
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
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 */
241 #define EXT2_HASH_SIPHASH 6
242
243 #define EXT2_HASH_FLAG_INCOMPAT 0x1
244
245 #define EXT4_DX_BLOCK_MASK 0x0fffffff
246
247 struct ext2_dx_entry {
248 __le32 hash;
249 __le32 block;
250 };
251
252 struct ext2_dx_countlimit {
253 __le16 limit;
254 __le16 count;
255 };
256
257 /*
258 * This goes at the end of each htree block.
259 */
260 struct ext2_dx_tail {
261 __le32 dt_reserved;
262 __le32 dt_checksum; /* crc32c(uuid+inum+dxblock) */
263 };
264
265 /*
266 * Macro-instructions used to manage group descriptors
267 */
268 #define EXT2_MIN_DESC_SIZE 32
269 #define EXT2_MIN_DESC_SIZE_64BIT 64
270 #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE
271 #define EXT2_DESC_SIZE(s) \
272 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \
273 (s)->s_desc_size : EXT2_MIN_DESC_SIZE)
274
275 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
276 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
277 #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group)
278 #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
279 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
280 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \
281 (EXT2_CLUSTER_SIZE(s) / \
282 EXT2_BLOCK_SIZE(s)))
283 #define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8)
284 #define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \
285 EXT2_INODES_PER_BLOCK(s))
286 #ifdef __KERNEL__
287 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
288 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
289 #else
290 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
291 #endif
292
293 #define EXT2_GROUPS_TO_BLOCKS(s, g) ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \
294 (g))
295 #define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \
296 (g))
297
298 /*
299 * Constants relative to the data blocks
300 */
301 #define EXT2_NDIR_BLOCKS 12
302 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
303 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
304 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
305 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
306
307 /*
308 * Inode flags
309 */
310 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
311 #define EXT2_UNRM_FL 0x00000002 /* Undelete */
312 #define EXT2_COMPR_FL 0x00000004 /* Compress file */
313 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
314 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
315 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
316 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
317 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
318 /* Reserved for compression usage... */
319 #define EXT2_DIRTY_FL 0x00000100
320 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
321 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
322 /* nb: was previously EXT2_ECOMPR_FL */
323 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted inode */
324 /* End compression flags --- maybe not all used */
325 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
326 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
327 #define EXT2_IMAGIC_FL 0x00002000
328 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
329 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
330 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
331 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
332 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
333 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
334 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
335 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
336 /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
337 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
338 #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */
339 #define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */
340 #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */
341 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data */
342 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
343 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */
344 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
345
346 #define EXT2_FL_USER_VISIBLE 0x604BDFFF /* User visible flags */
347 #define EXT2_FL_USER_MODIFIABLE 0x604B80FF /* User modifiable flags */
348
349 /*
350 * ioctl commands
351 */
352
353 /* Used for online resize */
354 struct ext2_new_group_input {
355 __u32 group; /* Group number for this data */
356 __u32 block_bitmap; /* Absolute block number of block bitmap */
357 __u32 inode_bitmap; /* Absolute block number of inode bitmap */
358 __u32 inode_table; /* Absolute block number of inode table start */
359 __u32 blocks_count; /* Total number of blocks in this group */
360 __u16 reserved_blocks; /* Number of reserved blocks in this group */
361 __u16 unused; /* Number of reserved GDT blocks in group */
362 };
363
364 struct ext4_new_group_input {
365 __u32 group; /* Group number for this data */
366 __u64 block_bitmap; /* Absolute block number of block bitmap */
367 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
368 __u64 inode_table; /* Absolute block number of inode table start */
369 __u32 blocks_count; /* Total number of blocks in this group */
370 __u16 reserved_blocks; /* Number of reserved blocks in this group */
371 __u16 unused;
372 };
373
374 #ifdef __GNU__ /* Needed for the Hurd */
375 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0)
376 #endif
377
378 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
379 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
380 #define EXT2_IOC_GETVERSION _IOR('v', 1, long)
381 #define EXT2_IOC_SETVERSION _IOW('v', 2, long)
382 #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long)
383 #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long)
384 #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
385 #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input)
386 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
387 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
388
389 /*
390 * Structure of an inode on the disk
391 */
392 struct ext2_inode {
393 /*00*/ __u16 i_mode; /* File mode */
394 __u16 i_uid; /* Low 16 bits of Owner Uid */
395 __u32 i_size; /* Size in bytes */
396 __u32 i_atime; /* Access time */
397 __u32 i_ctime; /* Inode change time */
398 /*10*/ __u32 i_mtime; /* Modification time */
399 __u32 i_dtime; /* Deletion Time */
400 __u16 i_gid; /* Low 16 bits of Group Id */
401 __u16 i_links_count; /* Links count */
402 __u32 i_blocks; /* Blocks count */
403 /*20*/ __u32 i_flags; /* File flags */
404 union {
405 struct {
406 __u32 l_i_version; /* was l_i_reserved1 */
407 } linux1;
408 struct {
409 __u32 h_i_translator;
410 } hurd1;
411 } osd1; /* OS dependent 1 */
412 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
413 /*64*/ __u32 i_generation; /* File version (for NFS) */
414 __u32 i_file_acl; /* File ACL */
415 __u32 i_size_high;
416 /*70*/ __u32 i_faddr; /* Fragment address */
417 union {
418 struct {
419 __u16 l_i_blocks_hi;
420 __u16 l_i_file_acl_high;
421 __u16 l_i_uid_high; /* these 2 fields */
422 __u16 l_i_gid_high; /* were reserved2[0] */
423 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
424 __u16 l_i_reserved;
425 } linux2;
426 struct {
427 __u8 h_i_frag; /* Fragment number */
428 __u8 h_i_fsize; /* Fragment size */
429 __u16 h_i_mode_high;
430 __u16 h_i_uid_high;
431 __u16 h_i_gid_high;
432 __u32 h_i_author;
433 } hurd2;
434 } osd2; /* OS dependent 2 */
435 };
436
437 /*
438 * Permanent part of an large inode on the disk
439 */
440 struct ext2_inode_large {
441 /*00*/ __u16 i_mode; /* File mode */
442 __u16 i_uid; /* Low 16 bits of Owner Uid */
443 __u32 i_size; /* Size in bytes */
444 __u32 i_atime; /* Access time */
445 __u32 i_ctime; /* Inode Change time */
446 /*10*/ __u32 i_mtime; /* Modification time */
447 __u32 i_dtime; /* Deletion Time */
448 __u16 i_gid; /* Low 16 bits of Group Id */
449 __u16 i_links_count; /* Links count */
450 __u32 i_blocks; /* Blocks count */
451 /*20*/ __u32 i_flags; /* File flags */
452 union {
453 struct {
454 __u32 l_i_version; /* was l_i_reserved1 */
455 } linux1;
456 struct {
457 __u32 h_i_translator;
458 } hurd1;
459 } osd1; /* OS dependent 1 */
460 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
461 /*64*/ __u32 i_generation; /* File version (for NFS) */
462 __u32 i_file_acl; /* File ACL */
463 __u32 i_size_high;
464 /*70*/ __u32 i_faddr; /* Fragment address */
465 union {
466 struct {
467 __u16 l_i_blocks_hi;
468 __u16 l_i_file_acl_high;
469 __u16 l_i_uid_high; /* these 2 fields */
470 __u16 l_i_gid_high; /* were reserved2[0] */
471 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
472 __u16 l_i_reserved;
473 } linux2;
474 struct {
475 __u8 h_i_frag; /* Fragment number */
476 __u8 h_i_fsize; /* Fragment size */
477 __u16 h_i_mode_high;
478 __u16 h_i_uid_high;
479 __u16 h_i_gid_high;
480 __u32 h_i_author;
481 } hurd2;
482 } osd2; /* OS dependent 2 */
483 /*80*/ __u16 i_extra_isize;
484 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */
485 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
486 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */
487 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
488 /*90*/ __u32 i_crtime; /* File creation time */
489 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/
490 __u32 i_version_hi; /* high 32 bits for 64-bit version */
491 /*9c*/ __u32 i_projid; /* Project ID */
492 };
493
494 #define EXT4_INODE_CSUM_HI_EXTRA_END \
495 (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \
496 EXT2_GOOD_OLD_INODE_SIZE)
497
498 #define EXT4_EPOCH_BITS 2
499 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
500
501 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
502
503 #define inode_includes(size, field) \
504 (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \
505 offsetof(struct ext2_inode_large, field)))
506
507 #if defined(__KERNEL__) || defined(__linux__)
508 #define i_reserved1 osd1.linux1.l_i_reserved1
509 #define i_frag osd2.linux2.l_i_frag
510 #define i_fsize osd2.linux2.l_i_fsize
511 #define i_uid_low i_uid
512 #define i_gid_low i_gid
513 #define i_uid_high osd2.linux2.l_i_uid_high
514 #define i_gid_high osd2.linux2.l_i_gid_high
515 #else
516 #if defined(__GNU__)
517
518 #define i_translator osd1.hurd1.h_i_translator
519 #define i_frag osd2.hurd2.h_i_frag;
520 #define i_fsize osd2.hurd2.h_i_fsize;
521 #define i_uid_high osd2.hurd2.h_i_uid_high
522 #define i_gid_high osd2.hurd2.h_i_gid_high
523 #define i_author osd2.hurd2.h_i_author
524
525 #endif /* __GNU__ */
526 #endif /* defined(__KERNEL__) || defined(__linux__) */
527
528 #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16)
529 #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16)
530 #define inode_projid(inode) ((inode).i_projid)
531 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
532 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))
533
534 static inline
EXT2_INODE(struct ext2_inode_large * large_inode)535 struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode)
536 {
537 return (struct ext2_inode *) large_inode;
538 }
539
540 /*
541 * File system states
542 */
543 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
544 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
545 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
546
547 /*
548 * Misc. filesystem flags
549 */
550 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
551 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
552 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */
553 #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */
554 #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */
555 #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */
556
557 /*
558 * Mount flags
559 */
560 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
561 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
562 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
563 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
564 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
565 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
566 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
567 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
568
569 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
570 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
571 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
572 EXT2_MOUNT_##opt)
573 /*
574 * Maximal mount counts between two filesystem checks
575 */
576 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
577 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
578
579 /*
580 * Behaviour when detecting errors
581 */
582 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
583 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
584 #define EXT2_ERRORS_PANIC 3 /* Panic */
585 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
586
587 #if (__GNUC__ >= 4)
588 #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
589 #else
590 #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
591 #endif
592
593 /* Metadata checksum algorithms */
594 #define EXT2_CRC32C_CHKSUM 1
595
596 /* Encryption algorithms, key size and key reference len */
597 #define EXT4_ENCRYPTION_MODE_INVALID 0
598 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
599 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
600 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
601 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
602
603 #define EXT4_AES_256_XTS_KEY_SIZE 64
604 #define EXT4_AES_256_GCM_KEY_SIZE 32
605 #define EXT4_AES_256_CBC_KEY_SIZE 32
606 #define EXT4_AES_256_CTS_KEY_SIZE 32
607 #define EXT4_MAX_KEY_SIZE 64
608
609 #define EXT4_KEY_DESCRIPTOR_SIZE 8
610 #define EXT4_CRYPTO_BLOCK_SIZE 16
611
612 /* Password derivation constants */
613 #define EXT4_MAX_PASSPHRASE_SIZE 1024
614 #define EXT4_MAX_SALT_SIZE 256
615 #define EXT4_PBKDF2_ITERATIONS 0xFFFF
616
617 #define EXT2_LABEL_LEN 16
618
619 /*
620 * Policy provided via an ioctl on the topmost directory. This
621 * structure is also in the kernel.
622 */
623 struct ext4_encryption_policy {
624 char version;
625 char contents_encryption_mode;
626 char filenames_encryption_mode;
627 char flags;
628 char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
629 } __attribute__((__packed__));
630
631 struct ext4_encryption_key {
632 __u32 mode;
633 char raw[EXT4_MAX_KEY_SIZE];
634 __u32 size;
635 } __attribute__((__packed__));
636
637 /*
638 * Structure of the super block
639 */
640 struct ext2_super_block {
641 /*000*/ __u32 s_inodes_count; /* Inodes count */
642 __u32 s_blocks_count; /* Blocks count */
643 __u32 s_r_blocks_count; /* Reserved blocks count */
644 __u32 s_free_blocks_count; /* Free blocks count */
645 /*010*/ __u32 s_free_inodes_count; /* Free inodes count */
646 __u32 s_first_data_block; /* First Data Block */
647 __u32 s_log_block_size; /* Block size */
648 __u32 s_log_cluster_size; /* Allocation cluster size */
649 /*020*/ __u32 s_blocks_per_group; /* # Blocks per group */
650 __u32 s_clusters_per_group; /* # Fragments per group */
651 __u32 s_inodes_per_group; /* # Inodes per group */
652 __u32 s_mtime; /* Mount time */
653 /*030*/ __u32 s_wtime; /* Write time */
654 __u16 s_mnt_count; /* Mount count */
655 __s16 s_max_mnt_count; /* Maximal mount count */
656 __u16 s_magic; /* Magic signature */
657 __u16 s_state; /* File system state */
658 __u16 s_errors; /* Behaviour when detecting errors */
659 __u16 s_minor_rev_level; /* minor revision level */
660 /*040*/ __u32 s_lastcheck; /* time of last check */
661 __u32 s_checkinterval; /* max. time between checks */
662 __u32 s_creator_os; /* OS */
663 __u32 s_rev_level; /* Revision level */
664 /*050*/ __u16 s_def_resuid; /* Default uid for reserved blocks */
665 __u16 s_def_resgid; /* Default gid for reserved blocks */
666 /*
667 * These fields are for EXT2_DYNAMIC_REV superblocks only.
668 *
669 * Note: the difference between the compatible feature set and
670 * the incompatible feature set is that if there is a bit set
671 * in the incompatible feature set that the kernel doesn't
672 * know about, it should refuse to mount the filesystem.
673 *
674 * e2fsck's requirements are more strict; if it doesn't know
675 * about a feature in either the compatible or incompatible
676 * feature set, it must abort and not try to meddle with
677 * things it doesn't understand...
678 */
679 __u32 s_first_ino; /* First non-reserved inode */
680 __u16 s_inode_size; /* size of inode structure */
681 __u16 s_block_group_nr; /* block group # of this superblock */
682 __u32 s_feature_compat; /* compatible feature set */
683 /*060*/ __u32 s_feature_incompat; /* incompatible feature set */
684 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
685 /*068*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
686 /*078*/ char s_volume_name[EXT2_LABEL_LEN]; /* volume name */
687 /*088*/ char s_last_mounted[64]; /* directory where last mounted */
688 /*0c8*/ __u32 s_algorithm_usage_bitmap; /* For compression */
689 /*
690 * Performance hints. Directory preallocation should only
691 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
692 */
693 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
694 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
695 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */
696 /*
697 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
698 */
699 /*0d0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
700 /*0e0*/ __u32 s_journal_inum; /* inode number of journal file */
701 __u32 s_journal_dev; /* device number of journal file */
702 __u32 s_last_orphan; /* start of list of inodes to delete */
703 /*0ec*/ __u32 s_hash_seed[4]; /* HTREE hash seed */
704 /*0fc*/ __u8 s_def_hash_version; /* Default hash version to use */
705 __u8 s_jnl_backup_type; /* Default type of journal backup */
706 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */
707 /*100*/ __u32 s_default_mount_opts; /* default EXT2_MOUNT_* flags used */
708 __u32 s_first_meta_bg; /* First metablock group */
709 __u32 s_mkfs_time; /* When the filesystem was created */
710 /*10c*/ __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
711 /*150*/ __u32 s_blocks_count_hi; /* Blocks count high 32bits */
712 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/
713 __u32 s_free_blocks_hi; /* Free blocks count */
714 __u16 s_min_extra_isize; /* All inodes have at least # bytes */
715 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
716 /*160*/ __u32 s_flags; /* Miscellaneous flags */
717 __u16 s_raid_stride; /* RAID stride in blocks */
718 __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
719 __u64 s_mmp_block; /* Block for multi-mount protection */
720 /*170*/ __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
721 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
722 __u8 s_checksum_type; /* metadata checksum algorithm */
723 __u8 s_encryption_level; /* versioning level for encryption */
724 __u8 s_reserved_pad; /* Padding to next 32bits */
725 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */
726 /*180*/ __u32 s_snapshot_inum; /* Inode number of active snapshot */
727 __u32 s_snapshot_id; /* sequential ID of active snapshot */
728 __u64 s_snapshot_r_blocks_count; /* active snapshot reserved blocks */
729 /*190*/ __u32 s_snapshot_list; /* inode number of disk snapshot list */
730 #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count)
731 __u32 s_error_count; /* number of fs errors */
732 __u32 s_first_error_time; /* first time an error happened */
733 __u32 s_first_error_ino; /* inode involved in first error */
734 /*1a0*/ __u64 s_first_error_block; /* block involved in first error */
735 __u8 s_first_error_func[32]; /* function where the error happened */
736 /*1c8*/ __u32 s_first_error_line; /* line number where error happened */
737 __u32 s_last_error_time; /* most recent time of an error */
738 /*1d0*/ __u32 s_last_error_ino; /* inode involved in last error */
739 __u32 s_last_error_line; /* line number where error happened */
740 __u64 s_last_error_block; /* block involved of last error */
741 /*1e0*/ __u8 s_last_error_func[32]; /* function where the error happened */
742 #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
743 /*200*/ __u8 s_mount_opts[64];
744 /*240*/ __u32 s_usr_quota_inum; /* inode number of user quota file */
745 __u32 s_grp_quota_inum; /* inode number of group quota file */
746 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */
747 /*24c*/ __u32 s_backup_bgs[2]; /* If sparse_super2 enabled */
748 /*254*/ __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
749 /*258*/ __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
750 /*268*/ __le32 s_lpf_ino; /* Location of the lost+found inode */
751 __le32 s_prj_quota_inum; /* inode for tracking project quota */
752 /*270*/ __le32 s_checksum_seed; /* crc32c(orig_uuid) if csum_seed set */
753 /*274*/ __u8 s_wtime_hi;
754 __u8 s_mtime_hi;
755 __u8 s_mkfs_time_hi;
756 __u8 s_lastcheck_hi;
757 __u8 s_first_error_time_hi;
758 __u8 s_last_error_time_hi;
759 __u8 s_pad[2];
760 /*27c*/ __le16 s_encoding; /* Filename charset encoding */
761 __le16 s_encoding_flags; /* Filename charset encoding flags */
762 __le32 s_reserved[95]; /* Padding to the end of the block */
763 /*3fc*/ __u32 s_checksum; /* crc32c(superblock) */
764 };
765
766 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
767
768 /*
769 * Codes for operating systems
770 */
771 #define EXT2_OS_LINUX 0
772 #define EXT2_OS_HURD 1
773 #define EXT2_OBSO_OS_MASIX 2
774 #define EXT2_OS_FREEBSD 3
775 #define EXT2_OS_LITES 4
776
777 /*
778 * Revision levels
779 */
780 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
781 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
782
783 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
784 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
785
786 #define EXT2_GOOD_OLD_INODE_SIZE 128
787
788 /*
789 * Journal inode backup types
790 */
791 #define EXT3_JNL_BACKUP_BLOCKS 1
792
793 /*
794 * Feature set definitions
795 */
796
797 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
798 ( EXT2_SB(sb)->s_feature_compat & (mask) )
799 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
800 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
801 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
802 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
803
804 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
805 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
806 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
807 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
808 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
809 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
810 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
811 /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */
812 #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100
813 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
814 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
815
816
817 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
818 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
819 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
820 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
821 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
822 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
823 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
824 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
825 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
826 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
827 /*
828 * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group
829 * descriptor checksums use the same algorithm as all other data
830 * structures' checksums.
831 */
832 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
833 #define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800
834 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
835 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 /* Project quota */
836 #define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000
837 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
838
839 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
840 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
841 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
842 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
843 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
844 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
845 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
846 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
847 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
848 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
849 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
850 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
851 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
852 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
853 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
854 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
855
856 #define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \
857 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
858 { \
859 return ((EXT2_SB(sb)->s_feature_compat & \
860 EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \
861 } \
862 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
863 { \
864 EXT2_SB(sb)->s_feature_compat |= \
865 EXT##ver##_FEATURE_COMPAT_##flagname; \
866 } \
867 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
868 { \
869 EXT2_SB(sb)->s_feature_compat &= \
870 ~EXT##ver##_FEATURE_COMPAT_##flagname; \
871 }
872
873 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \
874 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
875 { \
876 return ((EXT2_SB(sb)->s_feature_ro_compat & \
877 EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \
878 } \
879 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
880 { \
881 EXT2_SB(sb)->s_feature_ro_compat |= \
882 EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
883 } \
884 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
885 { \
886 EXT2_SB(sb)->s_feature_ro_compat &= \
887 ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
888 }
889
890 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \
891 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
892 { \
893 return ((EXT2_SB(sb)->s_feature_incompat & \
894 EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \
895 } \
896 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
897 { \
898 EXT2_SB(sb)->s_feature_incompat |= \
899 EXT##ver##_FEATURE_INCOMPAT_##flagname; \
900 } \
901 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
902 { \
903 EXT2_SB(sb)->s_feature_incompat &= \
904 ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \
905 }
906
907 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC)
908 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES)
909 EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL)
910 EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR)
911 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE)
912 EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX)
913 EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG)
914 EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP)
915 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2)
916 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, 4, STABLE_INODES)
917
918 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER)
919 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE)
920 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE)
921 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM)
922 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK)
923 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE)
924 EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT)
925 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA)
926 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC)
927 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM)
928 EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA)
929 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY)
930 EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT)
931 EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS)
932 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, 4, VERITY)
933
934 EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION)
935 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE)
936 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER)
937 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV)
938 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG)
939 EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS)
940 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT)
941 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP)
942 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG)
943 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE)
944 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA)
945 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED)
946 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR)
947 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA)
948 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT)
949 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, 4, CASEFOLD)
950
951 #define EXT2_FEATURE_COMPAT_SUPP 0
952 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
953 EXT4_FEATURE_INCOMPAT_MMP| \
954 EXT4_FEATURE_INCOMPAT_LARGEDIR| \
955 EXT4_FEATURE_INCOMPAT_EA_INODE)
956 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
957 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
958 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
959 EXT2_FEATURE_RO_COMPAT_BTREE_DIR| \
960 EXT4_FEATURE_RO_COMPAT_VERITY)
961
962 /*
963 * Default values for user and/or group using reserved blocks
964 */
965 #define EXT2_DEF_RESUID 0
966 #define EXT2_DEF_RESGID 0
967
968 /*
969 * Default mount options
970 */
971 #define EXT2_DEFM_DEBUG 0x0001
972 #define EXT2_DEFM_BSDGROUPS 0x0002
973 #define EXT2_DEFM_XATTR_USER 0x0004
974 #define EXT2_DEFM_ACL 0x0008
975 #define EXT2_DEFM_UID16 0x0010
976 #define EXT3_DEFM_JMODE 0x0060
977 #define EXT3_DEFM_JMODE_DATA 0x0020
978 #define EXT3_DEFM_JMODE_ORDERED 0x0040
979 #define EXT3_DEFM_JMODE_WBACK 0x0060
980 #define EXT4_DEFM_NOBARRIER 0x0100
981 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
982 #define EXT4_DEFM_DISCARD 0x0400
983 #define EXT4_DEFM_NODELALLOC 0x0800
984
ext4_hash_in_dirent(const struct ext2_inode * inode)985 static inline int ext4_hash_in_dirent(const struct ext2_inode *inode)
986 {
987 return (inode->i_flags & EXT4_ENCRYPT_FL) &&
988 (inode->i_flags & EXT4_CASEFOLD_FL);
989 }
990
991 /*
992 * Structure of a directory entry
993 */
994 #define EXT2_NAME_LEN 255
995
996 struct ext2_dir_entry {
997 __u32 inode; /* Inode number */
998 __u16 rec_len; /* Directory entry length */
999 __u16 name_len; /* Name length */
1000 char name[EXT2_NAME_LEN]; /* File name */
1001 };
1002
1003 /*
1004 * The new version of the directory entry. Since EXT2 structures are
1005 * stored in intel byte order, and the name_len field could never be
1006 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1007 * file_type field.
1008 *
1009 * This structure is deprecated due to endian issues. Please use struct
1010 * ext2_dir_entry and accessor functions
1011 * ext2fs_dirent_name_len
1012 * ext2fs_dirent_set_name_len
1013 * ext2fs_dirent_file_type
1014 * ext2fs_dirent_set_file_type
1015 * to get and set name_len and file_type fields.
1016 */
1017 struct ext2_dir_entry_2 {
1018 __u32 inode; /* Inode number */
1019 __u16 rec_len; /* Directory entry length */
1020 __u8 name_len; /* Name length */
1021 __u8 file_type;
1022 char name[EXT2_NAME_LEN]; /* File name */
1023 };
1024
1025 /*
1026 * Hashes for ext4_dir_entry for casefolded and ecrypted directories.
1027 * This is located at the first 4 bit aligned location after the name.
1028 */
1029
1030 struct ext2_dir_entry_hash {
1031 __le32 hash;
1032 __le32 minor_hash;
1033 };
1034
1035 #define EXT2_DIRENT_HASHES(entry) \
1036 ((struct ext2_dir_entry_hash *) &entry->name[\
1037 (ext2fs_dirent_name_len(entry) + \
1038 EXT2_DIR_ROUND) & ~EXT2_DIR_ROUND])
1039 #define EXT2_DIRENT_HASH(entry) \
1040 ext2fs_le32_to_cpu(EXT2_DIRENT_HASHES(entry)->hash)
1041 #define EXT2_DIRENT_MINOR_HASH(entry) \
1042 ext2fs_le32_to_cpu(EXT2_DIRENT_HASHES(entry)->minor_hash)
1043
1044 /*
1045 * This is a bogus directory entry at the end of each leaf block that
1046 * records checksums.
1047 */
1048 struct ext2_dir_entry_tail {
1049 __u32 det_reserved_zero1; /* Pretend to be unused */
1050 __u16 det_rec_len; /* 12 */
1051 __u16 det_reserved_name_len; /* 0xDE00, fake namelen/filetype */
1052 __u32 det_checksum; /* crc32c(uuid+inode+dirent) */
1053 };
1054
1055 /*
1056 * Ext2 directory file types. Only the low 3 bits are used. The
1057 * other bits are reserved for now.
1058 */
1059 #define EXT2_FT_UNKNOWN 0
1060 #define EXT2_FT_REG_FILE 1
1061 #define EXT2_FT_DIR 2
1062 #define EXT2_FT_CHRDEV 3
1063 #define EXT2_FT_BLKDEV 4
1064 #define EXT2_FT_FIFO 5
1065 #define EXT2_FT_SOCK 6
1066 #define EXT2_FT_SYMLINK 7
1067
1068 #define EXT2_FT_MAX 8
1069
1070 /*
1071 * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we
1072 * have to build ext2_dir_entry_tail with that assumption too. This
1073 * constant helps to build the dir_entry_tail to look like it has an
1074 * "invalid" file type.
1075 */
1076 #define EXT2_DIR_NAME_LEN_CSUM 0xDE00
1077
1078 /*
1079 * EXT2_DIR_PAD defines the directory entries boundaries
1080 *
1081 * NOTE: It must be a multiple of 4
1082 */
1083 #define EXT2_DIR_ENTRY_HEADER_LEN 8
1084 #define EXT2_DIR_ENTRY_HASH_LEN 8
1085 #define EXT2_DIR_PAD 4
1086 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
1087 #define EXT2_DIR_REC_LEN(name_len) ext2fs_dir_rec_len(name_len, 0)
1088
ext2fs_dir_rec_len(__u8 name_len,int extended)1089 static inline unsigned int ext2fs_dir_rec_len(__u8 name_len,
1090 int extended)
1091 {
1092 int rec_len = (name_len + EXT2_DIR_ENTRY_HEADER_LEN + EXT2_DIR_ROUND);
1093
1094 rec_len &= ~EXT2_DIR_ROUND;
1095 if (extended)
1096 rec_len += EXT2_DIR_ENTRY_HASH_LEN;
1097 return rec_len;
1098 }
1099
1100 /*
1101 * Constants for ext4's extended time encoding
1102 */
1103 #define EXT4_EPOCH_BITS 2
1104 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
1105 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
1106
1107 /*
1108 * This structure is used for multiple mount protection. It is written
1109 * into the block number saved in the s_mmp_block field in the superblock.
1110 * Programs that check MMP should assume that if SEQ_FSCK (or any unknown
1111 * code above SEQ_MAX) is present then it is NOT safe to use the filesystem,
1112 * regardless of how old the timestamp is.
1113 *
1114 * The timestamp in the MMP structure will be updated by e2fsck at some
1115 * arbitrary intervals (start of passes, after every few groups of inodes
1116 * in pass1 and pass1b). There is no guarantee that e2fsck is updating
1117 * the MMP block in a timely manner, and the updates it does are purely
1118 * for the convenience of the sysadmin and not for automatic validation.
1119 *
1120 * Note: Only the mmp_seq value is used to determine whether the MMP block
1121 * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname
1122 * fields are only for informational purposes for the administrator,
1123 * due to clock skew between nodes and hostname HA service takeover.
1124 */
1125 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1126 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1127 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1128 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1129
1130 /* Not endian-annotated; it's swapped at read/write time */
1131 struct mmp_struct {
1132 __u32 mmp_magic; /* Magic number for MMP */
1133 __u32 mmp_seq; /* Sequence no. updated periodically */
1134 __u64 mmp_time; /* Time last updated */
1135 char mmp_nodename[64]; /* Node which last updated MMP block */
1136 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1137 __u16 mmp_check_interval; /* Changed mmp_check_interval */
1138 __u16 mmp_pad1;
1139 __u32 mmp_pad2[226];
1140 __u32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1141 };
1142
1143 /*
1144 * Default interval for MMP update in seconds.
1145 */
1146 #define EXT4_MMP_UPDATE_INTERVAL 5
1147
1148 /*
1149 * Maximum interval for MMP update in seconds.
1150 */
1151 #define EXT4_MMP_MAX_UPDATE_INTERVAL 300
1152
1153 /*
1154 * Minimum interval for MMP checking in seconds.
1155 */
1156 #define EXT4_MMP_MIN_CHECK_INTERVAL 5
1157
1158 /*
1159 * Minimum size of inline data.
1160 */
1161 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) * EXT2_N_BLOCKS))
1162
1163 /*
1164 * Size of a parent inode in inline data directory.
1165 */
1166 #define EXT4_INLINE_DATA_DOTDOT_SIZE (4)
1167
1168 #define EXT4_ENC_UTF8_12_1 1
1169
1170 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) /* Reject invalid sequences */
1171
1172 #endif /* _LINUX_EXT2_FS_H */
1173