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1 /*-
2  * Copyright (c) 2010, 2012 Zheng Liu <lz@freebsd.org>
3  * Copyright (c) 2012, Vyacheslav Matyushin
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD$
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 struct ext2fs_htree_root_info {
62         uint32_t h_reserved1;
63         uint8_t  h_hash_version;
64         uint8_t  h_info_len;
65         uint8_t  h_ind_levels;
66         uint8_t  h_reserved2;
67 };
68
69 struct ext2fs_htree_root {
70         struct ext2fs_fake_direct h_dot;
71         char h_dot_name[4];
72         struct ext2fs_fake_direct h_dotdot;
73         char h_dotdot_name[4];
74         struct ext2fs_htree_root_info h_info;
75         struct ext2fs_htree_entry h_entries[0];
76 };
77
78 struct ext2fs_htree_node {
79         struct ext2fs_fake_direct h_fake_dirent;
80         struct ext2fs_htree_entry h_entries[0];
81 };
82
83 struct ext2fs_htree_lookup_level {
84         struct buf *h_bp;
85         struct ext2fs_htree_entry *h_entries;
86         struct ext2fs_htree_entry *h_entry;
87 };
88
89 struct ext2fs_htree_lookup_info {
90         struct ext2fs_htree_lookup_level h_levels[2];
91         uint32_t h_levels_num;
92 };
93
94 struct ext2fs_htree_sort_entry {
95         uint16_t h_offset;
96         uint16_t h_size;
97         uint32_t h_hash;
98 };
99
100 #endif /* !_FS_EXT2FS_HTREE_H_ */