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[FreeBSD/FreeBSD.git] / sys / fs / ext2fs / htree.h
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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  * $FreeBSD$
30  */
31
32 #ifndef _FS_EXT2FS_HTREE_H_
33 #define _FS_EXT2FS_HTREE_H_
34
35 /* EXT3 HTree directory indexing */
36
37 #define EXT2_HTREE_LEGACY               0
38 #define EXT2_HTREE_HALF_MD4             1
39 #define EXT2_HTREE_TEA                  2
40 #define EXT2_HTREE_LEGACY_UNSIGNED      3
41 #define EXT2_HTREE_HALF_MD4_UNSIGNED    4
42 #define EXT2_HTREE_TEA_UNSIGNED         5
43
44 #define EXT2_HTREE_EOF 0x7FFFFFFF
45
46 struct ext2fs_fake_direct {
47         uint32_t e2d_ino;               /* inode number of entry */
48         uint16_t e2d_reclen;            /* length of this record */
49         uint8_t e2d_namlen;             /* length of string in d_name */
50         uint8_t e2d_type;               /* file type */
51 };
52
53 struct ext2fs_htree_count {
54         uint16_t h_entries_max;
55         uint16_t h_entries_num;
56 };
57
58 struct ext2fs_htree_entry {
59         uint32_t h_hash;
60         uint32_t h_blk;
61 };
62
63 struct ext2fs_htree_root_info {
64         uint32_t h_reserved1;
65         uint8_t h_hash_version;
66         uint8_t h_info_len;
67         uint8_t h_ind_levels;
68         uint8_t h_reserved2;
69 };
70
71 struct ext2fs_htree_root {
72         struct ext2fs_fake_direct h_dot;
73         char    h_dot_name[4];
74         struct ext2fs_fake_direct h_dotdot;
75         char    h_dotdot_name[4];
76         struct ext2fs_htree_root_info h_info;
77         struct ext2fs_htree_entry h_entries[0];
78 };
79
80 struct ext2fs_htree_node {
81         struct ext2fs_fake_direct h_fake_dirent;
82         struct ext2fs_htree_entry h_entries[0];
83 };
84
85 struct ext2fs_htree_lookup_level {
86         struct buf *h_bp;
87         struct ext2fs_htree_entry *h_entries;
88         struct ext2fs_htree_entry *h_entry;
89 };
90
91 struct ext2fs_htree_lookup_info {
92         struct ext2fs_htree_lookup_level h_levels[2];
93         uint32_t h_levels_num;
94 };
95
96 struct ext2fs_htree_sort_entry {
97         uint16_t h_offset;
98         uint16_t h_size;
99         uint32_t h_hash;
100 };
101
102 #endif  /* !_FS_EXT2FS_HTREE_H_ */