The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/htree.h

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    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: releng/12.0/sys/fs/ext2fs/htree.h 327977 2018-01-14 20:46:39Z fsu $
   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_ */

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