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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2010, 2012 Zheng Liu <lz@freebsd.org>
5  * Copyright (c) 2012, Vyacheslav Matyushin
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29
30 #ifndef _FS_EXT2FS_HTREE_H_
31 #define _FS_EXT2FS_HTREE_H_
32
33 /* EXT3 HTree directory indexing */
34
35 #define EXT2_HTREE_LEGACY               0
36 #define EXT2_HTREE_HALF_MD4             1
37 #define EXT2_HTREE_TEA                  2
38 #define EXT2_HTREE_LEGACY_UNSIGNED      3
39 #define EXT2_HTREE_HALF_MD4_UNSIGNED    4
40 #define EXT2_HTREE_TEA_UNSIGNED         5
41
42 #define EXT2_HTREE_EOF 0x7FFFFFFF
43
44 struct ext2fs_fake_direct {
45         uint32_t e2d_ino;               /* inode number of entry */
46         uint16_t e2d_reclen;            /* length of this record */
47         uint8_t e2d_namlen;             /* length of string in d_name */
48         uint8_t e2d_type;               /* file type */
49 };
50
51 struct ext2fs_htree_count {
52         uint16_t h_entries_max;
53         uint16_t h_entries_num;
54 };
55
56 struct ext2fs_htree_entry {
57         uint32_t h_hash;
58         uint32_t h_blk;
59 };
60
61 /*
62  * This goes at the end of each htree block.
63  */
64 struct ext2fs_htree_tail {
65         uint32_t ht_reserved;
66         uint32_t ht_checksum;   /* crc32c(uuid+inum+dirblock) */
67 };
68
69 struct ext2fs_htree_root_info {
70         uint32_t h_reserved1;
71         uint8_t h_hash_version;
72         uint8_t h_info_len;
73         uint8_t h_ind_levels;
74         uint8_t h_reserved2;
75 };
76
77 struct ext2fs_htree_root {
78         struct ext2fs_fake_direct h_dot;
79         char    h_dot_name[4];
80         struct ext2fs_fake_direct h_dotdot;
81         char    h_dotdot_name[4];
82         struct ext2fs_htree_root_info h_info;
83         struct ext2fs_htree_entry h_entries[0];
84 };
85
86 struct ext2fs_htree_node {
87         struct ext2fs_fake_direct h_fake_dirent;
88         struct ext2fs_htree_entry h_entries[0];
89 };
90
91 struct ext2fs_htree_lookup_level {
92         struct buf *h_bp;
93         struct ext2fs_htree_entry *h_entries;
94         struct ext2fs_htree_entry *h_entry;
95 };
96
97 struct ext2fs_htree_lookup_info {
98         struct ext2fs_htree_lookup_level h_levels[2];
99         uint32_t h_levels_num;
100 };
101
102 struct ext2fs_htree_sort_entry {
103         uint16_t h_offset;
104         uint16_t h_size;
105         uint32_t h_hash;
106 };
107
108 #endif  /* !_FS_EXT2FS_HTREE_H_ */