1 /* $NetBSD: ext2fs_htree.h,v 1.1 2016/06/24 17:21:30 christos Exp $ */ 2 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: head/sys/fs/ext2fs/htree.h 262623 2014-02-28 21:25:32Z pfg $ 30 */ 31 #ifndef _FS_EXT2FS_HTREE_H_ 32 #define _FS_EXT2FS_HTREE_H_ 33 34 /* EXT3 HTree directory indexing */ 35 36 #define EXT2_HTREE_LEGACY 0 37 #define EXT2_HTREE_HALF_MD4 1 38 #define EXT2_HTREE_TEA 2 39 #define EXT2_HTREE_LEGACY_UNSIGNED 3 40 #define EXT2_HTREE_HALF_MD4_UNSIGNED 4 41 #define EXT2_HTREE_TEA_UNSIGNED 5 42 43 #define EXT2_HTREE_EOF 0x7FFFFFFF 44 45 struct ext2fs_fake_direct { 46 uint32_t e2d_ino; /* inode number of entry */ 47 uint16_t e2d_reclen; /* length of this record */ 48 uint8_t e2d_namlen; /* length of string in d_name */ 49 uint8_t e2d_type; /* file type */ 50 }; 51 52 struct ext2fs_htree_count { 53 uint16_t h_entries_max; 54 uint16_t h_entries_num; 55 }; 56 57 struct ext2fs_htree_entry { 58 uint32_t h_hash; 59 uint32_t h_blk; 60 }; 61 62 struct ext2fs_htree_root_info { 63 uint32_t h_reserved1; 64 uint8_t h_hash_version; 65 uint8_t h_info_len; 66 uint8_t h_ind_levels; 67 uint8_t h_reserved2; 68 }; 69 70 struct ext2fs_htree_root { 71 struct ext2fs_fake_direct h_dot; 72 char h_dot_name[4]; 73 struct ext2fs_fake_direct h_dotdot; 74 char h_dotdot_name[4]; 75 struct ext2fs_htree_root_info h_info; 76 struct ext2fs_htree_entry h_entries[0]; 77 }; 78 79 struct ext2fs_htree_node { 80 struct ext2fs_fake_direct h_fake_dirent; 81 struct ext2fs_htree_entry h_entries[0]; 82 }; 83 84 struct ext2fs_htree_lookup_level { 85 struct buf *h_bp; 86 struct ext2fs_htree_entry *h_entries; 87 struct ext2fs_htree_entry *h_entry; 88 }; 89 90 struct ext2fs_htree_lookup_info { 91 struct ext2fs_htree_lookup_level h_levels[2]; 92 uint32_t h_levels_num; 93 }; 94 95 struct ext2fs_htree_sort_entry { 96 uint16_t h_offset; 97 uint16_t h_size; 98 uint32_t h_hash; 99 }; 100 101 #endif /* !_FS_EXT2FS_HTREE_H_ */ 102