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
242 #define EXT2_HASH_FLAG_INCOMPAT 0x1
243
244 #define EXT4_DX_BLOCK_MASK 0x0fffffff
245
246 struct ext2_dx_entry {
247 __le32 hash;
248 __le32 block;
249 };
250
251 struct ext2_dx_countlimit {
252 __le16 limit;
253 __le16 count;
254 };
255
256 /*
257 * This goes at the end of each htree block.
258 */
259 struct ext2_dx_tail {
260 __le32 dt_reserved;
261 __le32 dt_checksum; /* crc32c(uuid+inum+dxblock) */
262 };
263
264 /*
265 * Macro-instructions used to manage group descriptors
266 */
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
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)
276 #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group)
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 */
279 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \
280 (EXT2_CLUSTER_SIZE(s) / \
281 EXT2_BLOCK_SIZE(s)))
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))
285 #ifdef __KERNEL__
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)
288 #else
289 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
290 #endif
291
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
297 /*
298 * Constants relative to the data blocks
299 */
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)
305
306 /*
307 * Inode flags
308 */
309 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
310 #define EXT2_UNRM_FL 0x00000002 /* Undelete */
311 #define EXT2_COMPR_FL 0x00000004 /* Compress file */
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 */
320 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
321 /* nb: was previously EXT2_ECOMPR_FL */
322 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted inode */
323 /* End compression flags --- maybe not all used */
324 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
325 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
326 #define EXT2_IMAGIC_FL 0x00002000
327 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
328 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
329 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
330 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
331 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
332 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
333 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
334 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
335 /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
336 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
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 */
340 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data */
341 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
342 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
343
344 #define EXT2_FL_USER_VISIBLE 0x204BDFFF /* User visible flags */
345 #define EXT2_FL_USER_MODIFIABLE 0x204B80FF /* User modifiable flags */
346
347 /*
348 * ioctl commands
349 */
350
351 /* Used for online resize */
352 struct ext2_new_group_input {
353 __u32 group; /* Group number for this data */
354 __u32 block_bitmap; /* Absolute block number of block bitmap */
355 __u32 inode_bitmap; /* Absolute block number of inode bitmap */
356 __u32 inode_table; /* Absolute block number of inode table start */
357 __u32 blocks_count; /* Total number of blocks in this group */
358 __u16 reserved_blocks; /* Number of reserved blocks in this group */
359 __u16 unused; /* Number of reserved GDT blocks in group */
360 };
361
362 struct ext4_new_group_input {
363 __u32 group; /* Group number for this data */
364 __u64 block_bitmap; /* Absolute block number of block bitmap */
365 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
366 __u64 inode_table; /* Absolute block number of inode table start */
367 __u32 blocks_count; /* Total number of blocks in this group */
368 __u16 reserved_blocks; /* Number of reserved blocks in this group */
369 __u16 unused;
370 };
371
372 #ifdef __GNU__ /* Needed for the Hurd */
373 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0)
374 #endif
375
376 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
377 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
378 #define EXT2_IOC_GETVERSION _IOR('v', 1, long)
379 #define EXT2_IOC_SETVERSION _IOW('v', 2, long)
380 #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long)
381 #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long)
382 #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
383 #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input)
384 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
385 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
386
387 /*
388 * Structure of an inode on the disk
389 */
390 struct ext2_inode {
391 /*00*/ __u16 i_mode; /* File mode */
392 __u16 i_uid; /* Low 16 bits of Owner Uid */
393 __u32 i_size; /* Size in bytes */
394 __u32 i_atime; /* Access time */
395 __u32 i_ctime; /* Inode change time */
396 /*10*/ __u32 i_mtime; /* Modification time */
397 __u32 i_dtime; /* Deletion Time */
398 __u16 i_gid; /* Low 16 bits of Group Id */
399 __u16 i_links_count; /* Links count */
400 __u32 i_blocks; /* Blocks count */
401 /*20*/ __u32 i_flags; /* File flags */
402 union {
403 struct {
404 __u32 l_i_version; /* was l_i_reserved1 */
405 } linux1;
406 struct {
407 __u32 h_i_translator;
408 } hurd1;
409 } osd1; /* OS dependent 1 */
410 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
411 /*64*/ __u32 i_generation; /* File version (for NFS) */
412 __u32 i_file_acl; /* File ACL */
413 __u32 i_size_high;
414 /*70*/ __u32 i_faddr; /* Fragment address */
415 union {
416 struct {
417 __u16 l_i_blocks_hi;
418 __u16 l_i_file_acl_high;
419 __u16 l_i_uid_high; /* these 2 fields */
420 __u16 l_i_gid_high; /* were reserved2[0] */
421 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
422 __u16 l_i_reserved;
423 } linux2;
424 struct {
425 __u8 h_i_frag; /* Fragment number */
426 __u8 h_i_fsize; /* Fragment size */
427 __u16 h_i_mode_high;
428 __u16 h_i_uid_high;
429 __u16 h_i_gid_high;
430 __u32 h_i_author;
431 } hurd2;
432 } osd2; /* OS dependent 2 */
433 };
434
435 /*
436 * Permanent part of an large inode on the disk
437 */
438 struct ext2_inode_large {
439 /*00*/ __u16 i_mode; /* File mode */
440 __u16 i_uid; /* Low 16 bits of Owner Uid */
441 __u32 i_size; /* Size in bytes */
442 __u32 i_atime; /* Access time */
443 __u32 i_ctime; /* Inode Change time */
444 /*10*/ __u32 i_mtime; /* Modification time */
445 __u32 i_dtime; /* Deletion Time */
446 __u16 i_gid; /* Low 16 bits of Group Id */
447 __u16 i_links_count; /* Links count */
448 __u32 i_blocks; /* Blocks count */
449 /*20*/ __u32 i_flags; /* File flags */
450 union {
451 struct {
452 __u32 l_i_version; /* was l_i_reserved1 */
453 } linux1;
454 struct {
455 __u32 h_i_translator;
456 } hurd1;
457 } osd1; /* OS dependent 1 */
458 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
459 /*64*/ __u32 i_generation; /* File version (for NFS) */
460 __u32 i_file_acl; /* File ACL */
461 __u32 i_size_high;
462 /*70*/ __u32 i_faddr; /* Fragment address */
463 union {
464 struct {
465 __u16 l_i_blocks_hi;
466 __u16 l_i_file_acl_high;
467 __u16 l_i_uid_high; /* these 2 fields */
468 __u16 l_i_gid_high; /* were reserved2[0] */
469 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
470 __u16 l_i_reserved;
471 } linux2;
472 struct {
473 __u8 h_i_frag; /* Fragment number */
474 __u8 h_i_fsize; /* Fragment size */
475 __u16 h_i_mode_high;
476 __u16 h_i_uid_high;
477 __u16 h_i_gid_high;
478 __u32 h_i_author;
479 } hurd2;
480 } osd2; /* OS dependent 2 */
481 /*80*/ __u16 i_extra_isize;
482 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */
483 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
484 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */
485 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
486 /*90*/ __u32 i_crtime; /* File creation time */
487 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/
488 __u32 i_version_hi; /* high 32 bits for 64-bit version */
489 /*9c*/ __u32 i_projid; /* Project ID */
490 };
491
492 #define EXT4_INODE_CSUM_HI_EXTRA_END \
493 (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \
494 EXT2_GOOD_OLD_INODE_SIZE)
495
496 #define EXT4_EPOCH_BITS 2
497 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
498
499 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
500
501 #define inode_includes(size, field) \
502 (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \
503 offsetof(struct ext2_inode_large, field)))
504
505 #if defined(__KERNEL__) || defined(__linux__)
506 #define i_reserved1 osd1.linux1.l_i_reserved1
507 #define i_frag osd2.linux2.l_i_frag
508 #define i_fsize osd2.linux2.l_i_fsize
509 #define i_uid_low i_uid
510 #define i_gid_low i_gid
511 #define i_uid_high osd2.linux2.l_i_uid_high
512 #define i_gid_high osd2.linux2.l_i_gid_high
513 #else
514 #if defined(__GNU__)
515
516 #define i_translator osd1.hurd1.h_i_translator
517 #define i_frag osd2.hurd2.h_i_frag;
518 #define i_fsize osd2.hurd2.h_i_fsize;
519 #define i_uid_high osd2.hurd2.h_i_uid_high
520 #define i_gid_high osd2.hurd2.h_i_gid_high
521 #define i_author osd2.hurd2.h_i_author
522
523 #endif /* __GNU__ */
524 #endif /* defined(__KERNEL__) || defined(__linux__) */
525
526 #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16)
527 #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16)
528 #define inode_projid(inode) ((inode).i_projid)
529 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
530 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))
531
532 static inline
EXT2_INODE(struct ext2_inode_large * large_inode)533 struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode)
534 {
535 return (struct ext2_inode *) large_inode;
536 }
537
538 /*
539 * File system states
540 */
541 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
542 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
543 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
544
545 /*
546 * Misc. filesystem flags
547 */
548 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
549 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
550 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */
551 #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */
552 #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */
553 #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */
554
555 /*
556 * Mount flags
557 */
558 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
559 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
560 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
561 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
562 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
563 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
564 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
565 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
566
567 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
568 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
569 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
570 EXT2_MOUNT_##opt)
571 /*
572 * Maximal mount counts between two filesystem checks
573 */
574 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
575 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
576
577 /*
578 * Behaviour when detecting errors
579 */
580 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
581 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
582 #define EXT2_ERRORS_PANIC 3 /* Panic */
583 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
584
585 #if (__GNUC__ >= 4)
586 #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
587 #else
588 #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
589 #endif
590
591 /* Metadata checksum algorithms */
592 #define EXT2_CRC32C_CHKSUM 1
593
594 /* Encryption algorithms, key size and key reference len */
595 #define EXT4_ENCRYPTION_MODE_INVALID 0
596 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
597 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
598 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
599 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
600
601 #define EXT4_AES_256_XTS_KEY_SIZE 64
602 #define EXT4_AES_256_GCM_KEY_SIZE 32
603 #define EXT4_AES_256_CBC_KEY_SIZE 32
604 #define EXT4_AES_256_CTS_KEY_SIZE 32
605 #define EXT4_MAX_KEY_SIZE 64
606
607 #define EXT4_KEY_DESCRIPTOR_SIZE 8
608 #define EXT4_CRYPTO_BLOCK_SIZE 16
609
610 /* Password derivation constants */
611 #define EXT4_MAX_PASSPHRASE_SIZE 1024
612 #define EXT4_MAX_SALT_SIZE 256
613 #define EXT4_PBKDF2_ITERATIONS 0xFFFF
614
615 #define EXT2_LABEL_LEN 16
616
617 /*
618 * Policy provided via an ioctl on the topmost directory. This
619 * structure is also in the kernel.
620 */
621 struct ext4_encryption_policy {
622 char version;
623 char contents_encryption_mode;
624 char filenames_encryption_mode;
625 char flags;
626 char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
627 } __attribute__((__packed__));
628
629 struct ext4_encryption_key {
630 __u32 mode;
631 char raw[EXT4_MAX_KEY_SIZE];
632 __u32 size;
633 } __attribute__((__packed__));
634
635 /*
636 * Structure of the super block
637 */
638 struct ext2_super_block {
639 /*000*/ __u32 s_inodes_count; /* Inodes count */
640 __u32 s_blocks_count; /* Blocks count */
641 __u32 s_r_blocks_count; /* Reserved blocks count */
642 __u32 s_free_blocks_count; /* Free blocks count */
643 /*010*/ __u32 s_free_inodes_count; /* Free inodes count */
644 __u32 s_first_data_block; /* First Data Block */
645 __u32 s_log_block_size; /* Block size */
646 __u32 s_log_cluster_size; /* Allocation cluster size */
647 /*020*/ __u32 s_blocks_per_group; /* # Blocks per group */
648 __u32 s_clusters_per_group; /* # Fragments per group */
649 __u32 s_inodes_per_group; /* # Inodes per group */
650 __u32 s_mtime; /* Mount time */
651 /*030*/ __u32 s_wtime; /* Write time */
652 __u16 s_mnt_count; /* Mount count */
653 __s16 s_max_mnt_count; /* Maximal mount count */
654 __u16 s_magic; /* Magic signature */
655 __u16 s_state; /* File system state */
656 __u16 s_errors; /* Behaviour when detecting errors */
657 __u16 s_minor_rev_level; /* minor revision level */
658 /*040*/ __u32 s_lastcheck; /* time of last check */
659 __u32 s_checkinterval; /* max. time between checks */
660 __u32 s_creator_os; /* OS */
661 __u32 s_rev_level; /* Revision level */
662 /*050*/ __u16 s_def_resuid; /* Default uid for reserved blocks */
663 __u16 s_def_resgid; /* Default gid for reserved blocks */
664 /*
665 * These fields are for EXT2_DYNAMIC_REV superblocks only.
666 *
667 * Note: the difference between the compatible feature set and
668 * the incompatible feature set is that if there is a bit set
669 * in the incompatible feature set that the kernel doesn't
670 * know about, it should refuse to mount the filesystem.
671 *
672 * e2fsck's requirements are more strict; if it doesn't know
673 * about a feature in either the compatible or incompatible
674 * feature set, it must abort and not try to meddle with
675 * things it doesn't understand...
676 */
677 __u32 s_first_ino; /* First non-reserved inode */
678 __u16 s_inode_size; /* size of inode structure */
679 __u16 s_block_group_nr; /* block group # of this superblock */
680 __u32 s_feature_compat; /* compatible feature set */
681 /*060*/ __u32 s_feature_incompat; /* incompatible feature set */
682 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
683 /*068*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
684 /*078*/ char s_volume_name[EXT2_LABEL_LEN]; /* volume name */
685 /*088*/ char s_last_mounted[64]; /* directory where last mounted */
686 /*0c8*/ __u32 s_algorithm_usage_bitmap; /* For compression */
687 /*
688 * Performance hints. Directory preallocation should only
689 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
690 */
691 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
692 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
693 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */
694 /*
695 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
696 */
697 /*0d0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
698 /*0e0*/ __u32 s_journal_inum; /* inode number of journal file */
699 __u32 s_journal_dev; /* device number of journal file */
700 __u32 s_last_orphan; /* start of list of inodes to delete */
701 /*0ec*/ __u32 s_hash_seed[4]; /* HTREE hash seed */
702 /*0fc*/ __u8 s_def_hash_version; /* Default hash version to use */
703 __u8 s_jnl_backup_type; /* Default type of journal backup */
704 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */
705 /*100*/ __u32 s_default_mount_opts; /* default EXT2_MOUNT_* flags used */
706 __u32 s_first_meta_bg; /* First metablock group */
707 __u32 s_mkfs_time; /* When the filesystem was created */
708 /*10c*/ __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
709 /*150*/ __u32 s_blocks_count_hi; /* Blocks count high 32bits */
710 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/
711 __u32 s_free_blocks_hi; /* Free blocks count */
712 __u16 s_min_extra_isize; /* All inodes have at least # bytes */
713 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
714 /*160*/ __u32 s_flags; /* Miscellaneous flags */
715 __u16 s_raid_stride; /* RAID stride in blocks */
716 __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
717 __u64 s_mmp_block; /* Block for multi-mount protection */
718 /*170*/ __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
719 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
720 __u8 s_checksum_type; /* metadata checksum algorithm */
721 __u8 s_encryption_level; /* versioning level for encryption */
722 __u8 s_reserved_pad; /* Padding to next 32bits */
723 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */
724 /*180*/ __u32 s_snapshot_inum; /* Inode number of active snapshot */
725 __u32 s_snapshot_id; /* sequential ID of active snapshot */
726 __u64 s_snapshot_r_blocks_count; /* active snapshot reserved blocks */
727 /*190*/ __u32 s_snapshot_list; /* inode number of disk snapshot list */
728 #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count)
729 __u32 s_error_count; /* number of fs errors */
730 __u32 s_first_error_time; /* first time an error happened */
731 __u32 s_first_error_ino; /* inode involved in first error */
732 /*1a0*/ __u64 s_first_error_block; /* block involved in first error */
733 __u8 s_first_error_func[32]; /* function where the error happened */
734 /*1c8*/ __u32 s_first_error_line; /* line number where error happened */
735 __u32 s_last_error_time; /* most recent time of an error */
736 /*1d0*/ __u32 s_last_error_ino; /* inode involved in last error */
737 __u32 s_last_error_line; /* line number where error happened */
738 __u64 s_last_error_block; /* block involved of last error */
739 /*1e0*/ __u8 s_last_error_func[32]; /* function where the error happened */
740 #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
741 /*200*/ __u8 s_mount_opts[64];
742 /*240*/ __u32 s_usr_quota_inum; /* inode number of user quota file */
743 __u32 s_grp_quota_inum; /* inode number of group quota file */
744 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */
745 /*24c*/ __u32 s_backup_bgs[2]; /* If sparse_super2 enabled */
746 /*254*/ __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
747 /*258*/ __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
748 /*268*/ __le32 s_lpf_ino; /* Location of the lost+found inode */
749 __le32 s_prj_quota_inum; /* inode for tracking project quota */
750 /*270*/ __le32 s_checksum_seed; /* crc32c(orig_uuid) if csum_seed set */
751 __le32 s_reserved[98]; /* Padding to the end of the block */
752 /*3fc*/ __u32 s_checksum; /* crc32c(superblock) */
753 };
754
755 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
756
757 /*
758 * Codes for operating systems
759 */
760 #define EXT2_OS_LINUX 0
761 #define EXT2_OS_HURD 1
762 #define EXT2_OBSO_OS_MASIX 2
763 #define EXT2_OS_FREEBSD 3
764 #define EXT2_OS_LITES 4
765
766 /*
767 * Revision levels
768 */
769 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
770 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
771
772 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
773 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
774
775 #define EXT2_GOOD_OLD_INODE_SIZE 128
776
777 /*
778 * Journal inode backup types
779 */
780 #define EXT3_JNL_BACKUP_BLOCKS 1
781
782 /*
783 * Feature set definitions
784 */
785
786 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
787 ( EXT2_SB(sb)->s_feature_compat & (mask) )
788 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
789 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
790 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
791 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
792
793 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
794 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
795 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
796 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
797 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
798 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
799 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
800 /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */
801 #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100
802 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
803
804
805 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
806 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
807 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
808 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
809 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
810 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
811 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
812 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
813 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
814 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
815 /*
816 * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group
817 * descriptor checksums use the same algorithm as all other data
818 * structures' checksums.
819 */
820 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
821 #define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800
822 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
823 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 /* Project quota */
824 #define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000
825 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
826
827 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
828 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
829 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
830 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
831 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
832 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
833 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
834 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
835 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
836 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
837 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
838 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
839 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
840 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
841 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
842
843 #define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \
844 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
845 { \
846 return ((EXT2_SB(sb)->s_feature_compat & \
847 EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \
848 } \
849 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
850 { \
851 EXT2_SB(sb)->s_feature_compat |= \
852 EXT##ver##_FEATURE_COMPAT_##flagname; \
853 } \
854 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
855 { \
856 EXT2_SB(sb)->s_feature_compat &= \
857 ~EXT##ver##_FEATURE_COMPAT_##flagname; \
858 }
859
860 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \
861 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
862 { \
863 return ((EXT2_SB(sb)->s_feature_ro_compat & \
864 EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \
865 } \
866 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
867 { \
868 EXT2_SB(sb)->s_feature_ro_compat |= \
869 EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
870 } \
871 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
872 { \
873 EXT2_SB(sb)->s_feature_ro_compat &= \
874 ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
875 }
876
877 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \
878 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
879 { \
880 return ((EXT2_SB(sb)->s_feature_incompat & \
881 EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \
882 } \
883 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
884 { \
885 EXT2_SB(sb)->s_feature_incompat |= \
886 EXT##ver##_FEATURE_INCOMPAT_##flagname; \
887 } \
888 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
889 { \
890 EXT2_SB(sb)->s_feature_incompat &= \
891 ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \
892 }
893
894 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC)
895 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES)
896 EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL)
897 EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR)
898 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE)
899 EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX)
900 EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG)
901 EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP)
902 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2)
903
904 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER)
905 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE)
906 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE)
907 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM)
908 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK)
909 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE)
910 EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT)
911 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA)
912 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC)
913 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM)
914 EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA)
915 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY)
916 EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT)
917 EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS)
918 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, 4, VERITY)
919
920 EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION)
921 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE)
922 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER)
923 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV)
924 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG)
925 EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS)
926 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT)
927 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP)
928 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG)
929 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE)
930 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA)
931 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED)
932 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR)
933 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA)
934 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT)
935
936 #define EXT2_FEATURE_COMPAT_SUPP 0
937 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
938 EXT4_FEATURE_INCOMPAT_MMP| \
939 EXT4_FEATURE_INCOMPAT_LARGEDIR| \
940 EXT4_FEATURE_INCOMPAT_EA_INODE)
941 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
942 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
943 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
944 EXT2_FEATURE_RO_COMPAT_BTREE_DIR| \
945 EXT4_FEATURE_RO_COMPAT_VERITY)
946
947 /*
948 * Default values for user and/or group using reserved blocks
949 */
950 #define EXT2_DEF_RESUID 0
951 #define EXT2_DEF_RESGID 0
952
953 /*
954 * Default mount options
955 */
956 #define EXT2_DEFM_DEBUG 0x0001
957 #define EXT2_DEFM_BSDGROUPS 0x0002
958 #define EXT2_DEFM_XATTR_USER 0x0004
959 #define EXT2_DEFM_ACL 0x0008
960 #define EXT2_DEFM_UID16 0x0010
961 #define EXT3_DEFM_JMODE 0x0060
962 #define EXT3_DEFM_JMODE_DATA 0x0020
963 #define EXT3_DEFM_JMODE_ORDERED 0x0040
964 #define EXT3_DEFM_JMODE_WBACK 0x0060
965 #define EXT4_DEFM_NOBARRIER 0x0100
966 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
967 #define EXT4_DEFM_DISCARD 0x0400
968 #define EXT4_DEFM_NODELALLOC 0x0800
969
970 /*
971 * Structure of a directory entry
972 */
973 #define EXT2_NAME_LEN 255
974
975 struct ext2_dir_entry {
976 __u32 inode; /* Inode number */
977 __u16 rec_len; /* Directory entry length */
978 __u16 name_len; /* Name length */
979 char name[EXT2_NAME_LEN]; /* File name */
980 };
981
982 /*
983 * The new version of the directory entry. Since EXT2 structures are
984 * stored in intel byte order, and the name_len field could never be
985 * bigger than 255 chars, it's safe to reclaim the extra byte for the
986 * file_type field.
987 *
988 * This structure is deprecated due to endian issues. Please use struct
989 * ext2_dir_entry and accessor functions
990 * ext2fs_dirent_name_len
991 * ext2fs_dirent_set_name_len
992 * ext2fs_dirent_file_type
993 * ext2fs_dirent_set_file_type
994 * to get and set name_len and file_type fields.
995 */
996 struct ext2_dir_entry_2 {
997 __u32 inode; /* Inode number */
998 __u16 rec_len; /* Directory entry length */
999 __u8 name_len; /* Name length */
1000 __u8 file_type;
1001 char name[EXT2_NAME_LEN]; /* File name */
1002 };
1003
1004 /*
1005 * This is a bogus directory entry at the end of each leaf block that
1006 * records checksums.
1007 */
1008 struct ext2_dir_entry_tail {
1009 __u32 det_reserved_zero1; /* Pretend to be unused */
1010 __u16 det_rec_len; /* 12 */
1011 __u16 det_reserved_name_len; /* 0xDE00, fake namelen/filetype */
1012 __u32 det_checksum; /* crc32c(uuid+inode+dirent) */
1013 };
1014
1015 /*
1016 * Ext2 directory file types. Only the low 3 bits are used. The
1017 * other bits are reserved for now.
1018 */
1019 #define EXT2_FT_UNKNOWN 0
1020 #define EXT2_FT_REG_FILE 1
1021 #define EXT2_FT_DIR 2
1022 #define EXT2_FT_CHRDEV 3
1023 #define EXT2_FT_BLKDEV 4
1024 #define EXT2_FT_FIFO 5
1025 #define EXT2_FT_SOCK 6
1026 #define EXT2_FT_SYMLINK 7
1027
1028 #define EXT2_FT_MAX 8
1029
1030 /*
1031 * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we
1032 * have to build ext2_dir_entry_tail with that assumption too. This
1033 * constant helps to build the dir_entry_tail to look like it has an
1034 * "invalid" file type.
1035 */
1036 #define EXT2_DIR_NAME_LEN_CSUM 0xDE00
1037
1038 /*
1039 * EXT2_DIR_PAD defines the directory entries boundaries
1040 *
1041 * NOTE: It must be a multiple of 4
1042 */
1043 #define EXT2_DIR_ENTRY_HEADER_LEN 8
1044 #define EXT2_DIR_PAD 4
1045 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
1046 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + \
1047 EXT2_DIR_ENTRY_HEADER_LEN + \
1048 EXT2_DIR_ROUND) & \
1049 ~EXT2_DIR_ROUND)
1050
1051 /*
1052 * Constants for ext4's extended time encoding
1053 */
1054 #define EXT4_EPOCH_BITS 2
1055 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
1056 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
1057
1058 /*
1059 * This structure is used for multiple mount protection. It is written
1060 * into the block number saved in the s_mmp_block field in the superblock.
1061 * Programs that check MMP should assume that if SEQ_FSCK (or any unknown
1062 * code above SEQ_MAX) is present then it is NOT safe to use the filesystem,
1063 * regardless of how old the timestamp is.
1064 *
1065 * The timestamp in the MMP structure will be updated by e2fsck at some
1066 * arbitrary intervals (start of passes, after every few groups of inodes
1067 * in pass1 and pass1b). There is no guarantee that e2fsck is updating
1068 * the MMP block in a timely manner, and the updates it does are purely
1069 * for the convenience of the sysadmin and not for automatic validation.
1070 *
1071 * Note: Only the mmp_seq value is used to determine whether the MMP block
1072 * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname
1073 * fields are only for informational purposes for the administrator,
1074 * due to clock skew between nodes and hostname HA service takeover.
1075 */
1076 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1077 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1078 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1079 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1080
1081 /* Not endian-annotated; it's swapped at read/write time */
1082 struct mmp_struct {
1083 __u32 mmp_magic; /* Magic number for MMP */
1084 __u32 mmp_seq; /* Sequence no. updated periodically */
1085 __u64 mmp_time; /* Time last updated */
1086 char mmp_nodename[64]; /* Node which last updated MMP block */
1087 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1088 __u16 mmp_check_interval; /* Changed mmp_check_interval */
1089 __u16 mmp_pad1;
1090 __u32 mmp_pad2[226];
1091 __u32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1092 };
1093
1094 /*
1095 * Default interval for MMP update in seconds.
1096 */
1097 #define EXT4_MMP_UPDATE_INTERVAL 5
1098
1099 /*
1100 * Maximum interval for MMP update in seconds.
1101 */
1102 #define EXT4_MMP_MAX_UPDATE_INTERVAL 300
1103
1104 /*
1105 * Minimum interval for MMP checking in seconds.
1106 */
1107 #define EXT4_MMP_MIN_CHECK_INTERVAL 5
1108
1109 /*
1110 * Minimum size of inline data.
1111 */
1112 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) * EXT2_N_BLOCKS))
1113
1114 /*
1115 * Size of a parent inode in inline data directory.
1116 */
1117 #define EXT4_INLINE_DATA_DOTDOT_SIZE (4)
1118
1119 #endif /* _LINUX_EXT2_FS_H */
1120