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  * Copyright (c) 2009 Aditya Sarawgi
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/9.2/sys/fs/ext2fs/ext2_dir.h 252099 2013-06-22 21:31:59Z pfg $
   27  */
   28 
   29 #ifndef _FS_EXT2FS_EXT2_DIR_H_
   30 #define _FS_EXT2FS_EXT2_DIR_H_
   31 
   32 /*
   33  * Structure of a directory entry
   34  */
   35 #define EXT2FS_MAXNAMLEN 255
   36 
   37 struct  ext2fs_direct {
   38         uint32_t e2d_ino;               /* inode number of entry */
   39         uint16_t e2d_reclen;            /* length of this record */
   40         uint16_t e2d_namlen;            /* length of string in e2d_name */
   41         char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
   42 };
   43 /*
   44  * The new version of the directory entry.  Since EXT2 structures are
   45  * stored in intel byte order, and the name_len field could never be
   46  * bigger than 255 chars, it's safe to reclaim the extra byte for the
   47  * file_type field.
   48  */
   49 struct  ext2fs_direct_2 {
   50         uint32_t e2d_ino;               /* inode number of entry */
   51         uint16_t e2d_reclen;            /* length of this record */
   52         uint8_t e2d_namlen;             /* length of string in e2d_name */
   53         uint8_t e2d_type;               /* file type */
   54         char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
   55 };
   56 
   57 /*
   58  * Maximal count of links to a file
   59  */
   60 #define EXT2_LINK_MAX   32000
   61 
   62 /*
   63  * Ext2 directory file types.  Only the low 3 bits are used.  The
   64  * other bits are reserved for now.
   65  */
   66 #define EXT2_FT_UNKNOWN         0
   67 #define EXT2_FT_REG_FILE        1
   68 #define EXT2_FT_DIR             2
   69 #define EXT2_FT_CHRDEV          3
   70 #define EXT2_FT_BLKDEV          4
   71 #define EXT2_FT_FIFO            5
   72 #define EXT2_FT_SOCK            6
   73 #define EXT2_FT_SYMLINK         7
   74 
   75 #define EXT2_FT_MAX             8
   76 
   77 /*
   78  * EXT2_DIR_PAD defines the directory entries boundaries
   79  *
   80  * NOTE: It must be a multiple of 4
   81  */
   82 #define EXT2_DIR_PAD                    4
   83 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
   84 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
   85                                          ~EXT2_DIR_ROUND)
   86 #endif /* !_FS_EXT2FS_EXT2_DIR_H_ */
   87 

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