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/ext2_dir.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009 Aditya Sarawgi
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/fs/ext2fs/ext2_dir.h 337454 2018-08-08 12:08:46Z fsu $
   29  */
   30 
   31 #ifndef _FS_EXT2FS_EXT2_DIR_H_
   32 #define _FS_EXT2FS_EXT2_DIR_H_
   33 
   34 /*
   35  * Structure of a directory entry
   36  */
   37 #define EXT2FS_MAXNAMLEN        255
   38 
   39 struct ext2fs_direct {
   40         uint32_t e2d_ino;               /* inode number of entry */
   41         uint16_t e2d_reclen;            /* length of this record */
   42         uint16_t e2d_namlen;            /* length of string in e2d_name */
   43         char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
   44 };
   45 
   46 enum slotstatus {
   47         NONE,
   48         COMPACT,
   49         FOUND
   50 };
   51 
   52 struct ext2fs_searchslot {
   53         enum slotstatus slotstatus;
   54         doff_t  slotoffset;             /* offset of area with free space */
   55         int     slotsize;               /* size of area at slotoffset */
   56         int     slotfreespace;          /* amount of space free in slot */
   57         int     slotneeded;             /* sizeof the entry we are seeking */
   58 };
   59 
   60 /*
   61  * The new version of the directory entry.  Since EXT2 structures are
   62  * stored in intel byte order, and the name_len field could never be
   63  * bigger than 255 chars, it's safe to reclaim the extra byte for the
   64  * file_type field.
   65  */
   66 struct ext2fs_direct_2 {
   67         uint32_t e2d_ino;               /* inode number of entry */
   68         uint16_t e2d_reclen;            /* length of this record */
   69         uint8_t e2d_namlen;             /* length of string in e2d_name */
   70         uint8_t e2d_type;               /* file type */
   71         char    e2d_name[EXT2FS_MAXNAMLEN];     /* name with
   72                                                  * length<=EXT2FS_MAXNAMLEN */
   73 };
   74 
   75 struct ext2fs_direct_tail {
   76         uint32_t e2dt_reserved_zero1;   /* pretend to be unused */
   77         uint16_t e2dt_rec_len;          /* 12 */
   78         uint8_t e2dt_reserved_zero2;    /* zero name length */
   79         uint8_t e2dt_reserved_ft;       /* 0xDE, fake file type */
   80         uint32_t e2dt_checksum;         /* crc32c(uuid+inum+dirblock) */
   81 };
   82 
   83 #define EXT2_FT_DIR_CSUM        0xDE
   84 
   85 #define EXT2_DIRENT_TAIL(data, blocksize) \
   86         ((struct ext2fs_direct_tail *)(((char *)(data)) + \
   87         (blocksize) - sizeof(struct ext2fs_direct_tail)))
   88 
   89 /*
   90  * Maximal count of links to a file
   91  */
   92 #define EXT4_LINK_MAX   65000
   93 
   94 /*
   95  * Ext2 directory file types.  Only the low 3 bits are used.  The
   96  * other bits are reserved for now.
   97  */
   98 #define EXT2_FT_UNKNOWN         0
   99 #define EXT2_FT_REG_FILE        1
  100 #define EXT2_FT_DIR             2
  101 #define EXT2_FT_CHRDEV          3
  102 #define EXT2_FT_BLKDEV          4
  103 #define EXT2_FT_FIFO            5
  104 #define EXT2_FT_SOCK            6
  105 #define EXT2_FT_SYMLINK         7
  106 #define EXT2_FT_MAX             8
  107 
  108 /*
  109  * EXT2_DIR_PAD defines the directory entries boundaries
  110  *
  111  * NOTE: It must be a multiple of 4
  112  */
  113 #define EXT2_DIR_PAD                    4
  114 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
  115 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
  116                                          ~EXT2_DIR_ROUND)
  117 #endif  /* !_FS_EXT2FS_EXT2_DIR_H_ */

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