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 #ifndef __nonstring
31 #ifdef __has_attribute
32 #if __has_attribute(__nonstring__)
33 #define __nonstring __attribute__((__nonstring__))
34 #else
35 #define __nonstring
36 #endif /* __has_attribute(__nonstring__) */
37 #else
38 # define __nonstring
39 #endif /* __has_attribute */
40 #endif /* __nonstring */
41
42 /*
43 * The second extended filesystem constants/structures
44 */
45
46 /*
47 * Define EXT2FS_DEBUG to produce debug messages
48 */
49 #undef EXT2FS_DEBUG
50
51 /*
52 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
53 */
54 #define EXT2_PREALLOCATE
55 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8
56
57 /*
58 * The second extended file system version
59 */
60 #define EXT2FS_DATE "95/08/09"
61 #define EXT2FS_VERSION "0.5b"
62
63 /*
64 * Special inode numbers
65 */
66 #define EXT2_BAD_INO 1 /* Bad blocks inode */
67 #define EXT2_ROOT_INO 2 /* Root inode */
68 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
69 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
70 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
71 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
72 #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
73 #define EXT2_JOURNAL_INO 8 /* Journal inode */
74 #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */
75 #define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */
76
77 /* First non-reserved inode for old ext2 filesystems */
78 #define EXT2_GOOD_OLD_FIRST_INO 11
79
80 /*
81 * The second extended file system magic number
82 */
83 #define EXT2_SUPER_MAGIC 0xEF53
84
85 #ifdef __KERNEL__
86 #define EXT2_SB(sb) (&((sb)->u.ext2_sb))
87 #else
88 /* Assume that user mode programs are passing in an ext2fs superblock, not
89 * a kernel struct super_block. This will allow us to call the feature-test
90 * macros from user land. */
91 #define EXT2_SB(sb) (sb)
92 #endif
93
94 /*
95 * Maximal count of links to a file
96 */
97 #define EXT2_LINK_MAX 65000
98
99 /*
100 * Macro-instructions used to manage several block sizes
101 */
102 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */
103 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */
104 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE)
105 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE)
106 #ifdef __KERNEL__
107 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
108 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
109 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits)
110 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
111 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
112 #else
113 #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
114 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
115 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
116 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
117 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
118 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
119 #endif
120 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
121
122 /*
123 * Macro-instructions used to manage allocation clusters
124 */
125 #define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
126 #define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */
127 #define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE
128 #define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE)
129 #define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \
130 (s)->s_log_cluster_size)
131 #define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10)
132
133 /*
134 * Macro-instructions used to manage fragments
135 *
136 * Note: for backwards compatibility only, for the dump program.
137 * Ext2/3/4 will never support fragments....
138 */
139 #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
140 #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
141 #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
142 #define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s)
143 #define EXT2_FRAGS_PER_BLOCK(s) 1
144
145 /*
146 * ACL structures
147 */
148 struct ext2_acl_header /* Header of Access Control Lists */
149 {
150 __u32 aclh_size;
151 __u32 aclh_file_count;
152 __u32 aclh_acle_count;
153 __u32 aclh_first_acle;
154 };
155
156 struct ext2_acl_entry /* Access Control List Entry */
157 {
158 __u32 acle_size;
159 __u16 acle_perms; /* Access permissions */
160 __u16 acle_type; /* Type of entry */
161 __u16 acle_tag; /* User or group identity */
162 __u16 acle_pad1;
163 __u32 acle_next; /* Pointer on next entry for the */
164 /* same inode or on next free entry */
165 };
166
167 /*
168 * Structure of a blocks group descriptor
169 */
170 struct ext2_group_desc
171 {
172 __u32 bg_block_bitmap; /* Blocks bitmap block */
173 __u32 bg_inode_bitmap; /* Inodes bitmap block */
174 __u32 bg_inode_table; /* Inodes table block */
175 __u16 bg_free_blocks_count; /* Free blocks count */
176 __u16 bg_free_inodes_count; /* Free inodes count */
177 __u16 bg_used_dirs_count; /* Directories count */
178 __u16 bg_flags;
179 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
180 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
181 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
182 __u16 bg_itable_unused; /* Unused inodes count */
183 __u16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/
184 };
185
186 /*
187 * Structure of a blocks group descriptor
188 */
189 struct ext4_group_desc
190 {
191 __u32 bg_block_bitmap; /* Blocks bitmap block */
192 __u32 bg_inode_bitmap; /* Inodes bitmap block */
193 __u32 bg_inode_table; /* Inodes table block */
194 __u16 bg_free_blocks_count; /* Free blocks count */
195 __u16 bg_free_inodes_count; /* Free inodes count */
196 __u16 bg_used_dirs_count; /* Directories count */
197 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
198 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
199 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
200 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
201 __u16 bg_itable_unused; /* Unused inodes count */
202 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */
203 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
204 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
205 __u32 bg_inode_table_hi; /* Inodes table block MSB */
206 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */
207 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */
208 __u16 bg_used_dirs_count_hi; /* Directories count MSB */
209 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */
210 __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
211 __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
212 __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
213 __u32 bg_reserved;
214 };
215
216 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
217 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
218 sizeof(__u16))
219 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION \
220 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
221 sizeof(__u16))
222
223 #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */
224 #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */
225 #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
226
227 /*
228 * Data structures used by the directory indexing feature
229 *
230 * Note: all of the multibyte integer fields are little endian.
231 */
232
233 /*
234 * Note: dx_root_info is laid out so that if it should somehow get
235 * overlaid by a dirent the two low bits of the hash version will be
236 * zero. Therefore, the hash version mod 4 should never be 0.
237 * Sincerely, the paranoia department.
238 */
239 struct ext2_dx_root_info {
240 __u32 reserved_zero;
241 __u8 hash_version; /* 0 now, 1 at release */
242 __u8 info_length; /* 8 */
243 __u8 indirect_levels;
244 __u8 unused_flags;
245 };
246
247 #define EXT2_HASH_LEGACY 0
248 #define EXT2_HASH_HALF_MD4 1
249 #define EXT2_HASH_TEA 2
250 #define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */
251 #define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */
252 #define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */
253 #define EXT2_HASH_SIPHASH 6
254
255 #define EXT2_HASH_FLAG_INCOMPAT 0x1
256
257 #define EXT4_DX_BLOCK_MASK 0x0fffffff
258
259 struct ext2_dx_entry {
260 __le32 hash;
261 __le32 block;
262 };
263
264 struct ext2_dx_countlimit {
265 __le16 limit;
266 __le16 count;
267 };
268
269 /*
270 * This goes at the end of each htree block.
271 */
272 struct ext2_dx_tail {
273 __le32 dt_reserved;
274 __le32 dt_checksum; /* crc32c(uuid+inum+dxblock) */
275 };
276
277 /*
278 * Macro-instructions used to manage group descriptors
279 */
280 #define EXT2_MIN_DESC_SIZE 32
281 #define EXT2_MIN_DESC_SIZE_64BIT 64
282 #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE
283 #define EXT2_DESC_SIZE(s) \
284 (ext2fs_has_feature_64bit(s) ? (s)->s_desc_size : EXT2_MIN_DESC_SIZE)
285
286 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
287 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
288 #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group)
289 #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
290 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
291 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \
292 (EXT2_CLUSTER_SIZE(s) / \
293 EXT2_BLOCK_SIZE(s)))
294 #define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8)
295 #define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \
296 EXT2_INODES_PER_BLOCK(s))
297 #ifdef __KERNEL__
298 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
299 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
300 #else
301 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
302 #endif
303
304 #define EXT2_GROUPS_TO_BLOCKS(s, g) ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \
305 (g))
306 #define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \
307 (g))
308
309 /*
310 * Constants relative to the data blocks
311 */
312 #define EXT2_NDIR_BLOCKS 12
313 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
314 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
315 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
316 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
317
318 /*
319 * Inode flags
320 */
321 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
322 #define EXT2_UNRM_FL 0x00000002 /* Undelete */
323 #define EXT2_COMPR_FL 0x00000004 /* Compress file */
324 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
325 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
326 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
327 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
328 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
329 /* Reserved for compression usage... */
330 #define EXT2_DIRTY_FL 0x00000100
331 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
332 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
333 /* nb: was previously EXT2_ECOMPR_FL */
334 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted inode */
335 /* End compression flags --- maybe not all used */
336 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
337 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
338 #define EXT2_IMAGIC_FL 0x00002000
339 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
340 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
341 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
342 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
343 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
344 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
345 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
346 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
347 /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
348 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
349 #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */
350 #define FS_DAX_FL 0x02000000 /* Inode is DAX */
351 #define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */
352 #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */
353 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data */
354 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
355 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */
356 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
357
358 #define EXT2_FL_USER_VISIBLE 0x604BDFFF /* User visible flags */
359 #define EXT2_FL_USER_MODIFIABLE 0x604B80FF /* User modifiable flags */
360
361 /*
362 * ioctl commands
363 */
364
365 /* Used for online resize */
366 struct ext2_new_group_input {
367 __u32 group; /* Group number for this data */
368 __u32 block_bitmap; /* Absolute block number of block bitmap */
369 __u32 inode_bitmap; /* Absolute block number of inode bitmap */
370 __u32 inode_table; /* Absolute block number of inode table start */
371 __u32 blocks_count; /* Total number of blocks in this group */
372 __u16 reserved_blocks; /* Number of reserved blocks in this group */
373 __u16 unused; /* Number of reserved GDT blocks in group */
374 };
375
376 struct ext4_new_group_input {
377 __u32 group; /* Group number for this data */
378 __u64 block_bitmap; /* Absolute block number of block bitmap */
379 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
380 __u64 inode_table; /* Absolute block number of inode table start */
381 __u32 blocks_count; /* Total number of blocks in this group */
382 __u16 reserved_blocks; /* Number of reserved blocks in this group */
383 __u16 unused;
384 };
385
386 #ifdef __GNU__ /* Needed for the Hurd */
387 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0)
388 #endif
389
390 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
391 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
392 #define EXT2_IOC_GETVERSION _IOR('v', 1, long)
393 #define EXT2_IOC_SETVERSION _IOW('v', 2, long)
394 #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long)
395 #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long)
396 #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
397 #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input)
398 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
399 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
400
401 /*
402 * Structure of an inode on the disk
403 */
404 struct ext2_inode {
405 /*00*/ __u16 i_mode; /* File mode */
406 __u16 i_uid; /* Low 16 bits of Owner Uid */
407 __u32 i_size; /* Size in bytes */
408 __u32 i_atime; /* Access time */
409 __u32 i_ctime; /* Inode change time */
410 /*10*/ __u32 i_mtime; /* Modification time */
411 __u32 i_dtime; /* Deletion Time */
412 __u16 i_gid; /* Low 16 bits of Group Id */
413 __u16 i_links_count; /* Links count */
414 __u32 i_blocks; /* Blocks count */
415 /*20*/ __u32 i_flags; /* File flags */
416 union {
417 struct {
418 __u32 l_i_version; /* was l_i_reserved1 */
419 } linux1;
420 struct {
421 __u32 h_i_translator;
422 } hurd1;
423 } osd1; /* OS dependent 1 */
424 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
425 /*64*/ __u32 i_generation; /* File version (for NFS) */
426 __u32 i_file_acl; /* File ACL */
427 __u32 i_size_high;
428 /*70*/ __u32 i_faddr; /* Fragment address */
429 union {
430 struct {
431 __u16 l_i_blocks_hi;
432 __u16 l_i_file_acl_high;
433 __u16 l_i_uid_high; /* these 2 fields */
434 __u16 l_i_gid_high; /* were reserved2[0] */
435 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
436 __u16 l_i_reserved;
437 } linux2;
438 struct {
439 __u8 h_i_frag; /* Fragment number */
440 __u8 h_i_fsize; /* Fragment size */
441 __u16 h_i_mode_high;
442 __u16 h_i_uid_high;
443 __u16 h_i_gid_high;
444 __u32 h_i_author;
445 } hurd2;
446 } osd2; /* OS dependent 2 */
447 };
448
449 /*
450 * Permanent part of an large inode on the disk
451 */
452 struct ext2_inode_large {
453 /*00*/ __u16 i_mode; /* File mode */
454 __u16 i_uid; /* Low 16 bits of Owner Uid */
455 __u32 i_size; /* Size in bytes */
456 __u32 i_atime; /* Access time */
457 __u32 i_ctime; /* Inode Change time */
458 /*10*/ __u32 i_mtime; /* Modification time */
459 __u32 i_dtime; /* Deletion Time */
460 __u16 i_gid; /* Low 16 bits of Group Id */
461 __u16 i_links_count; /* Links count */
462 __u32 i_blocks; /* Blocks count */
463 /*20*/ __u32 i_flags; /* File flags */
464 union {
465 struct {
466 __u32 l_i_version; /* was l_i_reserved1 */
467 } linux1;
468 struct {
469 __u32 h_i_translator;
470 } hurd1;
471 } osd1; /* OS dependent 1 */
472 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
473 /*64*/ __u32 i_generation; /* File version (for NFS) */
474 __u32 i_file_acl; /* File ACL */
475 __u32 i_size_high;
476 /*70*/ __u32 i_faddr; /* Fragment address */
477 union {
478 struct {
479 __u16 l_i_blocks_hi;
480 __u16 l_i_file_acl_high;
481 __u16 l_i_uid_high; /* these 2 fields */
482 __u16 l_i_gid_high; /* were reserved2[0] */
483 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
484 __u16 l_i_reserved;
485 } linux2;
486 struct {
487 __u8 h_i_frag; /* Fragment number */
488 __u8 h_i_fsize; /* Fragment size */
489 __u16 h_i_mode_high;
490 __u16 h_i_uid_high;
491 __u16 h_i_gid_high;
492 __u32 h_i_author;
493 } hurd2;
494 } osd2; /* OS dependent 2 */
495 /*80*/ __u16 i_extra_isize;
496 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */
497 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
498 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */
499 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
500 /*90*/ __u32 i_crtime; /* File creation time */
501 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/
502 __u32 i_version_hi; /* high 32 bits for 64-bit version */
503 /*9c*/ __u32 i_projid; /* Project ID */
504 };
505
506 #define EXT4_INODE_CSUM_HI_EXTRA_END \
507 (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \
508 EXT2_GOOD_OLD_INODE_SIZE)
509
510 #define EXT4_EPOCH_BITS 2
511 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
512
513 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
514
515 #define inode_includes(size, field) \
516 (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \
517 offsetof(struct ext2_inode_large, field)))
518
519 #if defined(__KERNEL__) || defined(__linux__)
520 #define i_reserved1 osd1.linux1.l_i_reserved1
521 #define i_frag osd2.linux2.l_i_frag
522 #define i_fsize osd2.linux2.l_i_fsize
523 #define i_uid_low i_uid
524 #define i_gid_low i_gid
525 #define i_uid_high osd2.linux2.l_i_uid_high
526 #define i_gid_high osd2.linux2.l_i_gid_high
527 #else
528 #if defined(__GNU__)
529
530 #define i_translator osd1.hurd1.h_i_translator
531 #define i_frag osd2.hurd2.h_i_frag;
532 #define i_fsize osd2.hurd2.h_i_fsize;
533 #define i_uid_high osd2.hurd2.h_i_uid_high
534 #define i_gid_high osd2.hurd2.h_i_gid_high
535 #define i_author osd2.hurd2.h_i_author
536
537 #endif /* __GNU__ */
538 #endif /* defined(__KERNEL__) || defined(__linux__) */
539
540 #define inode_uid(inode) ((inode).i_uid | (unsigned)(inode).osd2.linux2.l_i_uid_high << 16)
541 #define inode_gid(inode) ((inode).i_gid | (unsigned)(inode).osd2.linux2.l_i_gid_high << 16)
542 #define inode_projid(inode) ((inode).i_projid)
543 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
544 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))
545
546 static inline
EXT2_INODE(struct ext2_inode_large * large_inode)547 struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode)
548 {
549 return (struct ext2_inode *) large_inode;
550 }
551
552 /*
553 * File system states
554 */
555 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
556 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
557 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
558 #define EXT4_FC_REPLAY 0x0020 /* Ext4 fast commit replay ongoing */
559
560 /*
561 * Misc. filesystem flags
562 */
563 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
564 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
565 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */
566 #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */
567 #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */
568 #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */
569
570 /*
571 * Mount flags
572 */
573 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
574 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
575 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
576 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
577 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
578 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
579 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
580 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
581
582 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
583 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
584 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
585 EXT2_MOUNT_##opt)
586 /*
587 * Maximal mount counts between two filesystem checks
588 */
589 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
590 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
591
592 /*
593 * Behaviour when detecting errors
594 */
595 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
596 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
597 #define EXT2_ERRORS_PANIC 3 /* Panic */
598 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
599
600 #if (__GNUC__ >= 4)
601 #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
602 #else
603 #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
604 #endif
605
606 /* Metadata checksum algorithms */
607 #define EXT2_CRC32C_CHKSUM 1
608
609 /* Encryption algorithms, key size and key reference len */
610 #define EXT4_ENCRYPTION_MODE_INVALID 0
611 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
612 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
613 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
614 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
615
616 #define EXT4_AES_256_XTS_KEY_SIZE 64
617 #define EXT4_AES_256_GCM_KEY_SIZE 32
618 #define EXT4_AES_256_CBC_KEY_SIZE 32
619 #define EXT4_AES_256_CTS_KEY_SIZE 32
620 #define EXT4_MAX_KEY_SIZE 64
621
622 #define EXT4_KEY_DESCRIPTOR_SIZE 8
623 #define EXT4_CRYPTO_BLOCK_SIZE 16
624
625 /* Password derivation constants */
626 #define EXT4_MAX_PASSPHRASE_SIZE 1024
627 #define EXT4_MAX_SALT_SIZE 256
628 #define EXT4_PBKDF2_ITERATIONS 0xFFFF
629
630 #define EXT2_LABEL_LEN 16
631
632 /*
633 * Policy provided via an ioctl on the topmost directory. This
634 * structure is also in the kernel.
635 */
636 struct ext4_encryption_policy {
637 char version;
638 char contents_encryption_mode;
639 char filenames_encryption_mode;
640 char flags;
641 char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
642 } __attribute__((__packed__));
643
644 struct ext4_encryption_key {
645 __u32 mode;
646 char raw[EXT4_MAX_KEY_SIZE];
647 __u32 size;
648 } __attribute__((__packed__));
649
650 /*
651 * Structure of the super block
652 */
653 struct ext2_super_block {
654 /*000*/ __u32 s_inodes_count; /* Inodes count */
655 __u32 s_blocks_count; /* Blocks count */
656 __u32 s_r_blocks_count; /* Reserved blocks count */
657 __u32 s_free_blocks_count; /* Free blocks count */
658 /*010*/ __u32 s_free_inodes_count; /* Free inodes count */
659 __u32 s_first_data_block; /* First Data Block */
660 __u32 s_log_block_size; /* Block size */
661 __u32 s_log_cluster_size; /* Allocation cluster size */
662 /*020*/ __u32 s_blocks_per_group; /* # Blocks per group */
663 __u32 s_clusters_per_group; /* # Fragments per group */
664 __u32 s_inodes_per_group; /* # Inodes per group */
665 __u32 s_mtime; /* Mount time */
666 /*030*/ __u32 s_wtime; /* Write time */
667 __u16 s_mnt_count; /* Mount count */
668 __s16 s_max_mnt_count; /* Maximal mount count */
669 __u16 s_magic; /* Magic signature */
670 __u16 s_state; /* File system state */
671 __u16 s_errors; /* Behaviour when detecting errors */
672 __u16 s_minor_rev_level; /* minor revision level */
673 /*040*/ __u32 s_lastcheck; /* time of last check */
674 __u32 s_checkinterval; /* max. time between checks */
675 __u32 s_creator_os; /* OS */
676 __u32 s_rev_level; /* Revision level */
677 /*050*/ __u16 s_def_resuid; /* Default uid for reserved blocks */
678 __u16 s_def_resgid; /* Default gid for reserved blocks */
679 /*
680 * These fields are for EXT2_DYNAMIC_REV superblocks only.
681 *
682 * Note: the difference between the compatible feature set and
683 * the incompatible feature set is that if there is a bit set
684 * in the incompatible feature set that the kernel doesn't
685 * know about, it should refuse to mount the filesystem.
686 *
687 * e2fsck's requirements are more strict; if it doesn't know
688 * about a feature in either the compatible or incompatible
689 * feature set, it must abort and not try to meddle with
690 * things it doesn't understand...
691 */
692 __u32 s_first_ino; /* First non-reserved inode */
693 __u16 s_inode_size; /* size of inode structure */
694 __u16 s_block_group_nr; /* block group # of this superblock */
695 __u32 s_feature_compat; /* compatible feature set */
696 /*060*/ __u32 s_feature_incompat; /* incompatible feature set */
697 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
698 /*068*/ __u8 s_uuid[16] __nonstring; /* 128-bit uuid for volume */
699 /*078*/ __u8 s_volume_name[EXT2_LABEL_LEN] __nonstring; /* volume name, no NUL? */
700 /*088*/ __u8 s_last_mounted[64] __nonstring; /* directory last mounted on, no NUL? */
701 /*0c8*/ __u32 s_algorithm_usage_bitmap; /* For compression */
702 /*
703 * Performance hints. Directory preallocation should only
704 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
705 */
706 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
707 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
708 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */
709 /*
710 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
711 */
712 /*0d0*/ __u8 s_journal_uuid[16] __nonstring; /* uuid of journal superblock */
713 /*0e0*/ __u32 s_journal_inum; /* inode number of journal file */
714 __u32 s_journal_dev; /* device number of journal file */
715 __u32 s_last_orphan; /* start of list of inodes to delete */
716 /*0ec*/ __u32 s_hash_seed[4]; /* HTREE hash seed */
717 /*0fc*/ __u8 s_def_hash_version; /* Default hash version to use */
718 __u8 s_jnl_backup_type; /* Default type of journal backup */
719 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */
720 /*100*/ __u32 s_default_mount_opts; /* default EXT2_MOUNT_* flags used */
721 __u32 s_first_meta_bg; /* First metablock group */
722 __u32 s_mkfs_time; /* When the filesystem was created */
723 /*10c*/ __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
724 /*150*/ __u32 s_blocks_count_hi; /* Blocks count high 32bits */
725 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/
726 __u32 s_free_blocks_hi; /* Free blocks count */
727 __u16 s_min_extra_isize; /* All inodes have at least # bytes */
728 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
729 /*160*/ __u32 s_flags; /* Miscellaneous flags */
730 __u16 s_raid_stride; /* RAID stride in blocks */
731 __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
732 __u64 s_mmp_block; /* Block for multi-mount protection */
733 /*170*/ __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
734 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
735 __u8 s_checksum_type; /* metadata checksum algorithm */
736 __u8 s_encryption_level; /* versioning level for encryption */
737 __u8 s_reserved_pad; /* Padding to next 32bits */
738 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */
739 /*180*/ __u32 s_snapshot_inum; /* Inode number of active snapshot */
740 __u32 s_snapshot_id; /* sequential ID of active snapshot */
741 __u64 s_snapshot_r_blocks_count; /* active snapshot reserved blocks */
742 /*190*/ __u32 s_snapshot_list; /* inode number of disk snapshot list */
743 #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count)
744 __u32 s_error_count; /* number of fs errors */
745 __u32 s_first_error_time; /* first time an error happened */
746 __u32 s_first_error_ino; /* inode involved in first error */
747 /*1a0*/ __u64 s_first_error_block; /* block involved in first error */
748 __u8 s_first_error_func[32] __nonstring; /* function where error hit, no NUL? */
749 /*1c8*/ __u32 s_first_error_line; /* line number where error happened */
750 __u32 s_last_error_time; /* most recent time of an error */
751 /*1d0*/ __u32 s_last_error_ino; /* inode involved in last error */
752 __u32 s_last_error_line; /* line number where error happened */
753 __u64 s_last_error_block; /* block involved of last error */
754 /*1e0*/ __u8 s_last_error_func[32] __nonstring; /* function where error hit, no NUL? */
755 #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
756 /*200*/ __u8 s_mount_opts[64] __nonstring; /* default mount options, no NUL? */
757 /*240*/ __u32 s_usr_quota_inum; /* inode number of user quota file */
758 __u32 s_grp_quota_inum; /* inode number of group quota file */
759 __u32 s_overhead_clusters; /* overhead blocks/clusters in fs */
760 /*24c*/ __u32 s_backup_bgs[2]; /* If sparse_super2 enabled */
761 /*254*/ __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
762 /*258*/ __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
763 /*268*/ __le32 s_lpf_ino; /* Location of the lost+found inode */
764 __le32 s_prj_quota_inum; /* inode for tracking project quota */
765 /*270*/ __le32 s_checksum_seed; /* crc32c(orig_uuid) if csum_seed set */
766 /*274*/ __u8 s_wtime_hi;
767 __u8 s_mtime_hi;
768 __u8 s_mkfs_time_hi;
769 __u8 s_lastcheck_hi;
770 __u8 s_first_error_time_hi;
771 __u8 s_last_error_time_hi;
772 __u8 s_first_error_errcode;
773 __u8 s_last_error_errcode;
774 /*27c*/ __le16 s_encoding; /* Filename charset encoding */
775 __le16 s_encoding_flags; /* Filename charset encoding flags */
776 __le32 s_reserved[95]; /* Padding to the end of the block */
777 /*3fc*/ __u32 s_checksum; /* crc32c(superblock) */
778 };
779
780 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
781 #define EXT2_LEN_STR(buf) (int)sizeof(buf), (char *)buf
782
783 /*
784 * Codes for operating systems
785 */
786 #define EXT2_OS_LINUX 0
787 #define EXT2_OS_HURD 1
788 #define EXT2_OBSO_OS_MASIX 2
789 #define EXT2_OS_FREEBSD 3
790 #define EXT2_OS_LITES 4
791
792 /*
793 * Revision levels
794 */
795 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
796 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
797
798 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
799 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
800
801 #define EXT2_GOOD_OLD_INODE_SIZE 128
802
803 /*
804 * Journal inode backup types
805 */
806 #define EXT3_JNL_BACKUP_BLOCKS 1
807
808 /*
809 * Feature set definitions
810 */
811
812 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
813 ( EXT2_SB(sb)->s_feature_compat & (mask) )
814 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
815 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
816 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
817 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
818
819 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
820 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
821 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
822 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
823 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
824 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
825 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
826 /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */
827 #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100
828 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
829 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
830 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
831
832
833 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
834 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
835 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
836 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
837 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
838 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
839 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
840 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
841 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
842 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
843 /*
844 * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group
845 * descriptor checksums use the same algorithm as all other data
846 * structures' checksums.
847 */
848 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
849 #define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800
850 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
851 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 /* Project quota */
852 #define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000
853 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
854
855 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
856 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
857 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
858 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
859 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
860 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
861 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
862 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
863 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
864 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
865 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
866 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
867 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
868 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
869 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
870 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
871
872 #define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \
873 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
874 { \
875 return ((EXT2_SB(sb)->s_feature_compat & \
876 EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \
877 } \
878 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
879 { \
880 EXT2_SB(sb)->s_feature_compat |= \
881 EXT##ver##_FEATURE_COMPAT_##flagname; \
882 } \
883 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
884 { \
885 EXT2_SB(sb)->s_feature_compat &= \
886 ~EXT##ver##_FEATURE_COMPAT_##flagname; \
887 }
888
889 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \
890 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
891 { \
892 return ((EXT2_SB(sb)->s_feature_ro_compat & \
893 EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \
894 } \
895 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
896 { \
897 EXT2_SB(sb)->s_feature_ro_compat |= \
898 EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
899 } \
900 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
901 { \
902 EXT2_SB(sb)->s_feature_ro_compat &= \
903 ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
904 }
905
906 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \
907 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
908 { \
909 return ((EXT2_SB(sb)->s_feature_incompat & \
910 EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \
911 } \
912 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
913 { \
914 EXT2_SB(sb)->s_feature_incompat |= \
915 EXT##ver##_FEATURE_INCOMPAT_##flagname; \
916 } \
917 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
918 { \
919 EXT2_SB(sb)->s_feature_incompat &= \
920 ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \
921 }
922
923 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC)
924 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES)
925 EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL)
926 EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR)
927 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE)
928 EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX)
929 EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG)
930 EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP)
931 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2)
932 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, 4, FAST_COMMIT)
933 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, 4, STABLE_INODES)
934
935 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER)
936 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE)
937 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE)
938 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM)
939 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK)
940 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE)
941 EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT)
942 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA)
943 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC)
944 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM)
945 EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA)
946 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY)
947 EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT)
948 EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS)
949 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, 4, VERITY)
950
951 EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION)
952 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE)
953 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER)
954 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV)
955 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG)
956 EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS)
957 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT)
958 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP)
959 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG)
960 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE)
961 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA)
962 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED)
963 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR)
964 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA)
965 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT)
966 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, 4, CASEFOLD)
967
968 #define EXT2_FEATURE_COMPAT_SUPP 0
969 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
970 EXT4_FEATURE_INCOMPAT_MMP| \
971 EXT4_FEATURE_INCOMPAT_LARGEDIR| \
972 EXT4_FEATURE_INCOMPAT_EA_INODE)
973 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
974 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
975 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
976 EXT2_FEATURE_RO_COMPAT_BTREE_DIR| \
977 EXT4_FEATURE_RO_COMPAT_VERITY)
978
979 /*
980 * Default values for user and/or group using reserved blocks
981 */
982 #define EXT2_DEF_RESUID 0
983 #define EXT2_DEF_RESGID 0
984
985 /*
986 * Default mount options
987 */
988 #define EXT2_DEFM_DEBUG 0x0001
989 #define EXT2_DEFM_BSDGROUPS 0x0002
990 #define EXT2_DEFM_XATTR_USER 0x0004
991 #define EXT2_DEFM_ACL 0x0008
992 #define EXT2_DEFM_UID16 0x0010
993 #define EXT3_DEFM_JMODE 0x0060
994 #define EXT3_DEFM_JMODE_DATA 0x0020
995 #define EXT3_DEFM_JMODE_ORDERED 0x0040
996 #define EXT3_DEFM_JMODE_WBACK 0x0060
997 #define EXT4_DEFM_NOBARRIER 0x0100
998 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
999 #define EXT4_DEFM_DISCARD 0x0400
1000 #define EXT4_DEFM_NODELALLOC 0x0800
1001
ext4_hash_in_dirent(const struct ext2_inode * inode)1002 static inline int ext4_hash_in_dirent(const struct ext2_inode *inode)
1003 {
1004 return (inode->i_flags & EXT4_ENCRYPT_FL) &&
1005 (inode->i_flags & EXT4_CASEFOLD_FL);
1006 }
1007
1008 /*
1009 * Structure of a directory entry
1010 */
1011 #define EXT2_NAME_LEN 255
1012
1013 struct ext2_dir_entry {
1014 __u32 inode; /* Inode number */
1015 __u16 rec_len; /* Directory entry length */
1016 __u16 name_len; /* Name length */
1017 char name[EXT2_NAME_LEN]; /* File name */
1018 };
1019
1020 /*
1021 * The new version of the directory entry. Since EXT2 structures are
1022 * stored in intel byte order, and the name_len field could never be
1023 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1024 * file_type field.
1025 *
1026 * This structure is deprecated due to endian issues. Please use struct
1027 * ext2_dir_entry and accessor functions
1028 * ext2fs_dirent_name_len
1029 * ext2fs_dirent_set_name_len
1030 * ext2fs_dirent_file_type
1031 * ext2fs_dirent_set_file_type
1032 * to get and set name_len and file_type fields.
1033 */
1034 struct ext2_dir_entry_2 {
1035 __u32 inode; /* Inode number */
1036 __u16 rec_len; /* Directory entry length */
1037 __u8 name_len; /* Name length */
1038 __u8 file_type;
1039 char name[EXT2_NAME_LEN]; /* File name */
1040 };
1041
1042 /*
1043 * Hashes for ext4_dir_entry for casefolded and ecrypted directories.
1044 * This is located at the first 4 bit aligned location after the name.
1045 */
1046
1047 struct ext2_dir_entry_hash {
1048 __le32 hash;
1049 __le32 minor_hash;
1050 };
1051
1052 #define EXT2_DIRENT_HASHES(entry) \
1053 ((struct ext2_dir_entry_hash *) &entry->name[\
1054 (ext2fs_dirent_name_len(entry) + \
1055 EXT2_DIR_ROUND) & ~EXT2_DIR_ROUND])
1056 #define EXT2_DIRENT_HASH(entry) \
1057 ext2fs_le32_to_cpu(EXT2_DIRENT_HASHES(entry)->hash)
1058 #define EXT2_DIRENT_MINOR_HASH(entry) \
1059 ext2fs_le32_to_cpu(EXT2_DIRENT_HASHES(entry)->minor_hash)
1060
1061 /*
1062 * This is a bogus directory entry at the end of each leaf block that
1063 * records checksums.
1064 */
1065 struct ext2_dir_entry_tail {
1066 __u32 det_reserved_zero1; /* Pretend to be unused */
1067 __u16 det_rec_len; /* 12 */
1068 __u16 det_reserved_name_len; /* 0xDE00, fake namelen/filetype */
1069 __u32 det_checksum; /* crc32c(uuid+inode+dirent) */
1070 };
1071
1072 /*
1073 * Ext2 directory file types. Only the low 3 bits are used. The
1074 * other bits are reserved for now.
1075 */
1076 #define EXT2_FT_UNKNOWN 0
1077 #define EXT2_FT_REG_FILE 1
1078 #define EXT2_FT_DIR 2
1079 #define EXT2_FT_CHRDEV 3
1080 #define EXT2_FT_BLKDEV 4
1081 #define EXT2_FT_FIFO 5
1082 #define EXT2_FT_SOCK 6
1083 #define EXT2_FT_SYMLINK 7
1084
1085 #define EXT2_FT_MAX 8
1086
1087 /*
1088 * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we
1089 * have to build ext2_dir_entry_tail with that assumption too. This
1090 * constant helps to build the dir_entry_tail to look like it has an
1091 * "invalid" file type.
1092 */
1093 #define EXT2_DIR_NAME_LEN_CSUM 0xDE00
1094
1095 /*
1096 * EXT2_DIR_PAD defines the directory entries boundaries
1097 *
1098 * NOTE: It must be a multiple of 4
1099 */
1100 #define EXT2_DIR_ENTRY_HEADER_LEN 8
1101 #define EXT2_DIR_ENTRY_HASH_LEN 8
1102 #define EXT2_DIR_PAD 4
1103 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
1104 #define EXT2_DIR_REC_LEN(name_len) ext2fs_dir_rec_len(name_len, 0)
1105
ext2fs_dir_rec_len(__u8 name_len,int extended)1106 static inline unsigned int ext2fs_dir_rec_len(__u8 name_len,
1107 int extended)
1108 {
1109 int rec_len = (name_len + EXT2_DIR_ENTRY_HEADER_LEN + EXT2_DIR_ROUND);
1110
1111 rec_len &= ~EXT2_DIR_ROUND;
1112 if (extended)
1113 rec_len += EXT2_DIR_ENTRY_HASH_LEN;
1114 return rec_len;
1115 }
1116
1117 /*
1118 * Constants for ext4's extended time encoding
1119 */
1120 #define EXT4_EPOCH_BITS 2
1121 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
1122 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
1123
1124 /*
1125 * This structure is used for multiple mount protection. It is written
1126 * into the block number saved in the s_mmp_block field in the superblock.
1127 * Programs that check MMP should assume that if SEQ_FSCK (or any unknown
1128 * code above SEQ_MAX) is present then it is NOT safe to use the filesystem,
1129 * regardless of how old the timestamp is.
1130 *
1131 * The timestamp in the MMP structure will be updated by e2fsck at some
1132 * arbitrary intervals (start of passes, after every few groups of inodes
1133 * in pass1 and pass1b). There is no guarantee that e2fsck is updating
1134 * the MMP block in a timely manner, and the updates it does are purely
1135 * for the convenience of the sysadmin and not for automatic validation.
1136 *
1137 * Note: Only the mmp_seq value is used to determine whether the MMP block
1138 * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname
1139 * fields are only for informational purposes for the administrator,
1140 * due to clock skew between nodes and hostname HA service takeover.
1141 */
1142 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1143 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1144 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1145 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1146
1147 /* Not endian-annotated; it's swapped at read/write time */
1148 struct mmp_struct {
1149 __u32 mmp_magic; /* Magic number for MMP */
1150 __u32 mmp_seq; /* Sequence no. updated periodically */
1151 __u64 mmp_time; /* Time last updated (seconds) */
1152 __u8 mmp_nodename[64] __nonstring; /* Node updating MMP block, no NUL? */
1153 __u8 mmp_bdevname[32] __nonstring; /* Bdev updating MMP block, no NUL? */
1154 __u16 mmp_check_interval; /* Changed mmp_check_interval */
1155 __u16 mmp_pad1;
1156 __u32 mmp_pad2[226];
1157 __u32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1158 };
1159
1160 /*
1161 * Default interval for MMP update in seconds.
1162 */
1163 #define EXT4_MMP_UPDATE_INTERVAL 5
1164
1165 /*
1166 * Maximum interval for MMP update in seconds.
1167 */
1168 #define EXT4_MMP_MAX_UPDATE_INTERVAL 300
1169
1170 /*
1171 * Minimum interval for MMP checking in seconds.
1172 */
1173 #define EXT4_MMP_MIN_CHECK_INTERVAL 5
1174
1175 /*
1176 * Minimum size of inline data.
1177 */
1178 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) * EXT2_N_BLOCKS))
1179
1180 /*
1181 * Size of a parent inode in inline data directory.
1182 */
1183 #define EXT4_INLINE_DATA_DOTDOT_SIZE (4)
1184
1185 #define EXT4_ENC_UTF8_12_1 1
1186
1187 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) /* Reject invalid sequences */
1188
1189 #endif /* _LINUX_EXT2_FS_H */
1190