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 /* 64 * This goes at the end of each htree block. 65 */ 66 struct ext2fs_htree_tail { 67 uint32_t ht_reserved; 68 uint32_t ht_checksum; /* crc32c(uuid+inum+dirblock) */ 69 }; 70 71 struct ext2fs_htree_root_info { 72 uint32_t h_reserved1; 73 uint8_t h_hash_version; 74 uint8_t h_info_len; 75 uint8_t h_ind_levels; 76 uint8_t h_reserved2; 77 }; 78 79 struct ext2fs_htree_root { 80 struct ext2fs_fake_direct h_dot; 81 char h_dot_name[4]; 82 struct ext2fs_fake_direct h_dotdot; 83 char h_dotdot_name[4]; 84 struct ext2fs_htree_root_info h_info; 85 struct ext2fs_htree_entry h_entries[0]; 86 }; 87 88 struct ext2fs_htree_node { 89 struct ext2fs_fake_direct h_fake_dirent; 90 struct ext2fs_htree_entry h_entries[0]; 91 }; 92 93 struct ext2fs_htree_lookup_level { 94 struct buf *h_bp; 95 struct ext2fs_htree_entry *h_entries; 96 struct ext2fs_htree_entry *h_entry; 97 }; 98 99 struct ext2fs_htree_lookup_info { 100 struct ext2fs_htree_lookup_level h_levels[2]; 101 uint32_t h_levels_num; 102 }; 103 104 struct ext2fs_htree_sort_entry { 105 uint16_t h_offset; 106 uint16_t h_size; 107 uint32_t h_hash; 108 }; 109 110 #endif /* !_FS_EXT2FS_HTREE_H_ */ 111