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  * 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: stable/11/sys/fs/ext2fs/htree.h 311231 2017-01-04 02:42:17Z pfg $
   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_ */

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