2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
6 * Copyright (c) 2012 Martin Sucha
7 * Copyright (c) 2012 Frantisek Princ
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * - Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * - Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * - The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 /** @addtogroup lwext4
39 * @brief Ext4 data structure definitions.
45 #include <ext4_config.h>
46 #include <ext4_blockdev.h>
52 * Structure of the super block
55 uint32_t inodes_count; /* I-nodes count */
56 uint32_t blocks_count_lo; /* Blocks count */
57 uint32_t reserved_blocks_count_lo; /* Reserved blocks count */
58 uint32_t free_blocks_count_lo; /* Free blocks count */
59 uint32_t free_inodes_count; /* Free inodes count */
60 uint32_t first_data_block; /* First Data Block */
61 uint32_t log_block_size; /* Block size */
62 uint32_t log_frag_size; /* Obsoleted fragment size */
63 uint32_t blocks_per_group; /* Number of blocks per group */
64 uint32_t frags_per_group; /* Obsoleted fragments per group */
65 uint32_t inodes_per_group; /* Number of inodes per group */
66 uint32_t mount_time; /* Mount time */
67 uint32_t write_time; /* Write time */
68 uint16_t mount_count; /* Mount count */
69 uint16_t max_mount_count; /* Maximal mount count */
70 uint16_t magic; /* Magic signature */
71 uint16_t state; /* File system state */
72 uint16_t errors; /* Behaviour when detecting errors */
73 uint16_t minor_rev_level; /* Minor revision level */
74 uint32_t last_check_time; /* Time of last check */
75 uint32_t check_interval; /* Maximum time between checks */
76 uint32_t creator_os; /* Creator OS */
77 uint32_t rev_level; /* Revision level */
78 uint16_t def_resuid; /* Default uid for reserved blocks */
79 uint16_t def_resgid; /* Default gid for reserved blocks */
81 /* Fields for EXT4_DYNAMIC_REV superblocks only. */
82 uint32_t first_inode; /* First non-reserved inode */
83 uint16_t inode_size; /* Size of inode structure */
84 uint16_t block_group_index; /* Block group index of this superblock */
85 uint32_t features_compatible; /* Compatible feature set */
86 uint32_t features_incompatible; /* Incompatible feature set */
87 uint32_t features_read_only; /* Readonly-compatible feature set */
88 uint8_t uuid[16]; /* 128-bit uuid for volume */
89 char volume_name[16]; /* Volume name */
90 char last_mounted[64]; /* Directory where last mounted */
91 uint32_t algorithm_usage_bitmap; /* For compression */
94 * Performance hints. Directory preallocation should only
95 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
97 uint8_t s_prealloc_blocks; /* Number of blocks to try to preallocate */
98 uint8_t s_prealloc_dir_blocks; /* Number to preallocate for dirs */
99 uint16_t s_reserved_gdt_blocks; /* Per group desc for online growth */
102 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
104 uint8_t journal_uuid[16]; /* UUID of journal superblock */
105 uint32_t journal_inode_number; /* Inode number of journal file */
106 uint32_t journal_dev; /* Device number of journal file */
107 uint32_t last_orphan; /* Head of list of inodes to delete */
108 uint32_t hash_seed[4]; /* HTREE hash seed */
109 uint8_t default_hash_version; /* Default hash version to use */
110 uint8_t journal_backup_type;
111 uint16_t desc_size; /* Size of group descriptor */
112 uint32_t default_mount_opts; /* Default mount options */
113 uint32_t first_meta_bg; /* First metablock block group */
114 uint32_t mkfs_time; /* When the filesystem was created */
115 uint32_t journal_blocks[17]; /* Backup of the journal inode */
117 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
118 uint32_t blocks_count_hi; /* Blocks count */
119 uint32_t reserved_blocks_count_hi; /* Reserved blocks count */
120 uint32_t free_blocks_count_hi; /* Free blocks count */
121 uint16_t min_extra_isize; /* All inodes have at least # bytes */
122 uint16_t want_extra_isize; /* New inodes should reserve # bytes */
123 uint32_t flags; /* Miscellaneous flags */
124 uint16_t raid_stride; /* RAID stride */
125 uint16_t mmp_interval; /* # seconds to wait in MMP checking */
126 uint64_t mmp_block; /* Block for multi-mount protection */
127 uint32_t raid_stripe_width; /* Blocks on all data disks (N * stride) */
128 uint8_t log_groups_per_flex; /* FLEX_BG group size */
129 uint8_t reserved_char_pad;
130 uint16_t reserved_pad;
131 uint64_t kbytes_written; /* Number of lifetime kilobytes written */
132 uint32_t snapshot_inum; /* I-node number of active snapshot */
133 uint32_t snapshot_id; /* Sequential ID of active snapshot */
134 uint64_t snapshot_r_blocks_count; /* Reserved blocks for active snapshot's future use */
135 uint32_t snapshot_list; /* I-node number of the head of the on-disk snapshot list */
136 uint32_t error_count; /* Number of file system errors */
137 uint32_t first_error_time; /* First time an error happened */
138 uint32_t first_error_ino; /* I-node involved in first error */
139 uint64_t first_error_block; /* Block involved of first error */
140 uint8_t first_error_func[32]; /* Function where the error happened */
141 uint32_t first_error_line; /* Line number where error happened */
142 uint32_t last_error_time; /* Most recent time of an error */
143 uint32_t last_error_ino; /* I-node involved in last error */
144 uint32_t last_error_line; /* Line number where error happened */
145 uint64_t last_error_block; /* Block involved of last error */
146 uint8_t last_error_func[32]; /* Function where the error happened */
147 uint8_t mount_opts[64];
148 uint32_t padding[112]; /* Padding to the end of the block */
149 } __attribute__((packed));
152 #define EXT4_SUPERBLOCK_MAGIC 0xEF53
153 #define EXT4_SUPERBLOCK_SIZE 1024
154 #define EXT4_SUPERBLOCK_OFFSET 1024
156 #define EXT4_SUPERBLOCK_OS_LINUX 0
157 #define EXT4_SUPERBLOCK_OS_HURD 1
160 * Misc. filesystem flags
162 #define EXT4_SUPERBLOCK_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
163 #define EXT4_SUPERBLOCK_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
164 #define EXT4_SUPERBLOCK_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
169 #define EXT4_SUPERBLOCK_STATE_VALID_FS 0x0001 /* Unmounted cleanly */
170 #define EXT4_SUPERBLOCK_STATE_ERROR_FS 0x0002 /* Errors detected */
171 #define EXT4_SUPERBLOCK_STATE_ORPHAN_FS 0x0004 /* Orphans being recovered */
174 * Behaviour when errors detected
176 #define EXT4_SUPERBLOCK_ERRORS_CONTINUE 1 /* Continue execution */
177 #define EXT4_SUPERBLOCK_ERRORS_RO 2 /* Remount fs read-only */
178 #define EXT4_SUPERBLOCK_ERRORS_PANIC 3 /* Panic */
179 #define EXT4_SUPERBLOCK_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
182 * Compatible features
184 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
185 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
186 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
187 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
188 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
189 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
192 * Read-only compatible features
194 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
195 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
196 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
197 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
198 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
199 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
200 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
203 * Incompatible features
205 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
206 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
207 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
208 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
209 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
210 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
211 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
212 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
213 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
214 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
215 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
217 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_DIR_INDEX)
219 #define EXT4_FEATURE_INCOMPAT_SUPP \
220 (EXT4_FEATURE_INCOMPAT_FILETYPE | \
221 EXT4_FEATURE_INCOMPAT_EXTENTS | \
222 EXT4_FEATURE_INCOMPAT_64BIT)
224 #define EXT4_FEATURE_RO_COMPAT_SUPP \
225 (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
226 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
227 EXT4_FEATURE_RO_COMPAT_HUGE_FILE | \
228 EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
229 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | \
230 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)
233 struct ext4_blockdev*bdev;
234 struct ext4_sblock sb;
236 uint64_t inode_block_limits[4];
237 uint64_t inode_blocks_per_level[4];
239 uint32_t last_inode_bg_id;
243 #define EXT4_BLOCK_GROUP_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
244 #define EXT4_BLOCK_GROUP_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
245 #define EXT4_BLOCK_GROUP_ITABLE_ZEROED 0x0004 /* On-disk itable initialized to zero */
248 * Structure of a blocks group descriptor
251 uint32_t block_bitmap_lo; /* Blocks bitmap block */
252 uint32_t inode_bitmap_lo; /* Inodes bitmap block */
253 uint32_t inode_table_first_block_lo; /* Inodes table block */
254 uint16_t free_blocks_count_lo; /* Free blocks count */
255 uint16_t free_inodes_count_lo; /* Free inodes count */
256 uint16_t used_dirs_count_lo; /* Directories count */
257 uint16_t flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
258 uint32_t reserved[2]; /* Likely block/inode bitmap checksum */
259 uint16_t itable_unused_lo; /* Unused inodes count */
260 uint16_t checksum; /* crc16(sb_uuid+group+desc) */
262 uint32_t block_bitmap_hi; /* Blocks bitmap block MSB */
263 uint32_t inode_bitmap_hi; /* I-nodes bitmap block MSB */
264 uint32_t inode_table_first_block_hi; /* I-nodes table block MSB */
265 uint16_t free_blocks_count_hi; /* Free blocks count MSB */
266 uint16_t free_inodes_count_hi; /* Free i-nodes count MSB */
267 uint16_t used_dirs_count_hi; /* Directories count MSB */
268 uint16_t itable_unused_hi; /* Unused inodes count MSB */
269 uint32_t reserved2[3]; /* Padding */
272 struct ext4_block_group_ref {
273 struct ext4_block block;
274 struct ext4_bgroup *block_group;
280 #define EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE 32
281 #define EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE 64
283 #define EXT4_MIN_BLOCK_SIZE 1024 /* 1 KiB */
284 #define EXT4_MAX_BLOCK_SIZE 65536 /* 64 KiB */
285 #define EXT4_REV0_INODE_SIZE 128
287 #define EXT4_INODE_BLOCK_SIZE 512
289 #define EXT4_INODE_DIRECT_BLOCK_COUNT 12
290 #define EXT4_INODE_INDIRECT_BLOCK EXT4_INODE_DIRECT_BLOCK_COUNT
291 #define EXT4_INODE_DOUBLE_INDIRECT_BLOCK (EXT4_INODE_INDIRECT_BLOCK + 1)
292 #define EXT4_INODE_TRIPPLE_INDIRECT_BLOCK (EXT4_INODE_DOUBLE_INDIRECT_BLOCK + 1)
293 #define EXT4_INODE_BLOCKS (EXT4_INODE_TRIPPLE_INDIRECT_BLOCK + 1)
294 #define EXT4_INODE_INDIRECT_BLOCK_COUNT (EXT4_INODE_BLOCKS - EXT4_INODE_DIRECT_BLOCK_COUNT)
297 * Structure of an inode on the disk
300 uint16_t mode; /* File mode */
301 uint16_t uid; /* Low 16 bits of owner uid */
302 uint32_t size_lo; /* Size in bytes */
303 uint32_t access_time; /* Access time */
304 uint32_t change_inode_time; /* I-node change time */
305 uint32_t modification_time; /* Modification time */
306 uint32_t deletion_time; /* Deletion time */
307 uint16_t gid; /* Low 16 bits of group id */
308 uint16_t links_count; /* Links count */
309 uint32_t blocks_count_lo; /* Blocks count */
310 uint32_t flags; /* File flags */
311 uint32_t unused_osd1; /* OS dependent - not used in HelenOS */
312 uint32_t blocks[EXT4_INODE_BLOCKS]; /* Pointers to blocks */
313 uint32_t generation; /* File version (for NFS) */
314 uint32_t file_acl_lo; /* File ACL */
316 uint32_t obso_faddr; /* Obsoleted fragment address */
320 uint16_t blocks_high;
321 uint16_t file_acl_high;
333 } __attribute__ ((packed)) osd2;
335 uint16_t extra_isize;
337 uint32_t ctime_extra; /* Extra change time (nsec << 2 | epoch) */
338 uint32_t mtime_extra; /* Extra Modification time (nsec << 2 | epoch) */
339 uint32_t atime_extra; /* Extra Access time (nsec << 2 | epoch) */
340 uint32_t crtime; /* File creation time */
341 uint32_t crtime_extra; /* Extra file creation time (nsec << 2 | epoch) */
342 uint32_t version_hi; /* High 32 bits for 64-bit version */
343 } __attribute__ ((packed)) ;
345 #define EXT4_INODE_MODE_FIFO 0x1000
346 #define EXT4_INODE_MODE_CHARDEV 0x2000
347 #define EXT4_INODE_MODE_DIRECTORY 0x4000
348 #define EXT4_INODE_MODE_BLOCKDEV 0x6000
349 #define EXT4_INODE_MODE_FILE 0x8000
350 #define EXT4_INODE_MODE_SOFTLINK 0xA000
351 #define EXT4_INODE_MODE_SOCKET 0xC000
352 #define EXT4_INODE_MODE_TYPE_MASK 0xF000
357 #define EXT4_INODE_FLAG_SECRM 0x00000001 /* Secure deletion */
358 #define EXT4_INODE_FLAG_UNRM 0x00000002 /* Undelete */
359 #define EXT4_INODE_FLAG_COMPR 0x00000004 /* Compress file */
360 #define EXT4_INODE_FLAG_SYNC 0x00000008 /* Synchronous updates */
361 #define EXT4_INODE_FLAG_IMMUTABLE 0x00000010 /* Immutable file */
362 #define EXT4_INODE_FLAG_APPEND 0x00000020 /* writes to file may only append */
363 #define EXT4_INODE_FLAG_NODUMP 0x00000040 /* do not dump file */
364 #define EXT4_INODE_FLAG_NOATIME 0x00000080 /* do not update atime */
366 /* Compression flags */
367 #define EXT4_INODE_FLAG_DIRTY 0x00000100
368 #define EXT4_INODE_FLAG_COMPRBLK 0x00000200 /* One or more compressed clusters */
369 #define EXT4_INODE_FLAG_NOCOMPR 0x00000400 /* Don't compress */
370 #define EXT4_INODE_FLAG_ECOMPR 0x00000800 /* Compression error */
372 #define EXT4_INODE_FLAG_INDEX 0x00001000 /* hash-indexed directory */
373 #define EXT4_INODE_FLAG_IMAGIC 0x00002000 /* AFS directory */
374 #define EXT4_INODE_FLAG_JOURNAL_DATA 0x00004000 /* File data should be journaled */
375 #define EXT4_INODE_FLAG_NOTAIL 0x00008000 /* File tail should not be merged */
376 #define EXT4_INODE_FLAG_DIRSYNC 0x00010000 /* Dirsync behaviour (directories only) */
377 #define EXT4_INODE_FLAG_TOPDIR 0x00020000 /* Top of directory hierarchies */
378 #define EXT4_INODE_FLAG_HUGE_FILE 0x00040000 /* Set to each huge file */
379 #define EXT4_INODE_FLAG_EXTENTS 0x00080000 /* Inode uses extents */
380 #define EXT4_INODE_FLAG_EA_INODE 0x00200000 /* Inode used for large EA */
381 #define EXT4_INODE_FLAG_EOFBLOCKS 0x00400000 /* Blocks allocated beyond EOF */
382 #define EXT4_INODE_FLAG_RESERVED 0x80000000 /* reserved for ext4 lib */
384 #define EXT4_INODE_ROOT_INDEX 2
386 struct ext4_inode_ref {
387 struct ext4_block block;
388 struct ext4_inode *inode;
395 #define EXT4_DIRECTORY_FILENAME_LEN 255
397 #define EXT4_DIRECTORY_FILETYPE_UNKNOWN 0
398 #define EXT4_DIRECTORY_FILETYPE_REG_FILE 1
399 #define EXT4_DIRECTORY_FILETYPE_DIR 2
400 #define EXT4_DIRECTORY_FILETYPE_CHRDEV 3
401 #define EXT4_DIRECTORY_FILETYPE_BLKDEV 4
402 #define EXT4_DIRECTORY_FILETYPE_FIFO 5
403 #define EXT4_DIRECTORY_FILETYPE_SOCK 6
404 #define EXT4_DIRECTORY_FILETYPE_SYMLINK 7
406 union ext4_directory_entry_ll_internal{
407 uint8_t name_length_high; /* Higher 8 bits of name length */
408 uint8_t inode_type; /* Type of referenced inode (in rev >= 0.5) */
409 } __attribute__ ((packed));
412 * Linked list directory entry structure
414 struct ext4_directory_entry_ll {
415 uint32_t inode; /* I-node for the entry */
416 uint16_t entry_length; /* Distance to the next directory entry */
417 uint8_t name_length; /* Lower 8 bits of name length */
419 union ext4_directory_entry_ll_internal in;
421 uint8_t name[EXT4_DIRECTORY_FILENAME_LEN]; /* Entry name */
422 } __attribute__((packed)) ;
424 struct ext4_directory_iterator {
425 struct ext4_inode_ref *inode_ref;
426 struct ext4_block current_block;
427 uint64_t current_offset;
428 struct ext4_directory_entry_ll *current;
431 struct ext4_directory_search_result {
432 struct ext4_block block;
433 struct ext4_directory_entry_ll *dentry;
436 /* Structures for indexed directory */
438 struct ext4_directory_dx_countlimit {
443 struct ext4_directory_dx_dot_entry {
445 uint16_t entry_length;
451 struct ext4_directory_dx_root_info {
452 uint32_t reserved_zero;
453 uint8_t hash_version;
455 uint8_t indirect_levels;
456 uint8_t unused_flags;
459 struct ext4_directory_dx_entry {
464 struct ext4_directory_dx_root {
465 struct ext4_directory_dx_dot_entry dots[2];
466 struct ext4_directory_dx_root_info info;
467 struct ext4_directory_dx_entry entries[];
470 struct ext4_fake_directory_entry {
472 uint16_t entry_length;
477 struct ext4_directory_dx_node {
478 struct ext4_fake_directory_entry fake;
479 struct ext4_directory_dx_entry entries[];
482 struct ext4_directory_dx_block {
483 struct ext4_block block;
484 struct ext4_directory_dx_entry *entries;
485 struct ext4_directory_dx_entry *position;
488 #define EXT4_ERR_BAD_DX_DIR (-25000)
492 * This is the extent on-disk structure.
493 * It's used at the bottom of the tree.
496 uint32_t first_block; /* First logical block extent covers */
497 uint16_t block_count; /* Number of blocks covered by extent */
498 uint16_t start_hi; /* High 16 bits of physical block */
499 uint32_t start_lo; /* Low 32 bits of physical block */
503 * This is index on-disk structure.
504 * It's used at all the levels except the bottom.
506 struct ext4_extent_index {
507 uint32_t first_block; /* Index covers logical blocks from 'block' */
510 * Pointer to the physical block of the next
511 * level. leaf or next index could be there
512 * high 16 bits of physical block
520 * Each block (leaves and indexes), even inode-stored has header.
522 struct ext4_extent_header {
524 uint16_t entries_count; /* Number of valid entries */
525 uint16_t max_entries_count; /* Capacity of store in entries */
526 uint16_t depth; /* Has tree real underlying blocks? */
527 uint32_t generation; /* generation of the tree */
530 struct ext4_extent_path {
531 struct ext4_block block;
533 struct ext4_extent_header *header;
534 struct ext4_extent_index *index;
535 struct ext4_extent *extent;
538 #define EXT4_EXTENT_MAGIC 0xF30A
540 #define EXT4_EXTENT_FIRST(header) \
541 ((struct ext4_extent *) (((char *) (header)) + sizeof(struct ext4_extent_header)))
543 #define EXT4_EXTENT_FIRST_INDEX(header) \
544 ((struct ext4_extent_index *) (((char *) (header)) + sizeof(struct ext4_extent_header)))
547 /* EXT3 HTree directory indexing */
548 #define EXT2_HTREE_LEGACY 0
549 #define EXT2_HTREE_HALF_MD4 1
550 #define EXT2_HTREE_TEA 2
551 #define EXT2_HTREE_LEGACY_UNSIGNED 3
552 #define EXT2_HTREE_HALF_MD4_UNSIGNED 4
553 #define EXT2_HTREE_TEA_UNSIGNED 5
555 #define EXT2_HTREE_EOF 0x7FFFFFFFUL
558 struct ext4_hash_info {
561 uint32_t hash_version;
562 const uint32_t *seed;
565 /*****************************************************************************/
568 #ifdef CONFIG_BIG_ENDIAN
569 static inline uint64_t to_le64(uint64_t n)
571 return ((n & 0xff) << 56) |
572 ((n & 0xff00) << 40) |
573 ((n & 0xff0000) << 24) |
574 ((n & 0xff000000LL) << 8) |
575 ((n & 0xff00000000LL) >> 8) |
576 ((n & 0xff0000000000LL) >> 24) |
577 ((n & 0xff000000000000LL) >> 40) |
578 ((n & 0xff00000000000000LL) >> 56);
581 static inline uint32_t to_le32(uint32_t n)
583 return ((n & 0xff) << 24) |
584 ((n & 0xff00) << 8) |
585 ((n & 0xff0000) >> 8) |
586 ((n & 0xff000000) >> 24);
589 static inline uint16_t to_le16(uint16_t n)
591 return ((n & 0xff) << 8) |
597 #define to_le64(_n) _n
598 #define to_le32(_n) _n
599 #define to_le16(_n) _n
602 /****************************Access macros to ext4 structures*****************/
604 #define ext4_get32(s, f) to_le32((s)->f)
605 #define ext4_get16(s, f) to_le16((s)->f)
606 #define ext4_get8(s, f) (s)->f
609 #define ext4_set32(s, f, v) do { (s)->f = to_le32(v); }while(0)
610 #define ext4_set16(s, f, v) do { (s)->f = to_le16(v); }while(0)
611 #define ext4_set8 (s, f, v) do { (s)->f = (v); }while(0)
613 #endif /* EXT4_TYPES_H_ */