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: stable/11/sys/fs/ext2fs/ext2_dir.h 311231 2017-01-04 02:42:17Z 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 enum slotstatus {
   45         NONE,
   46         COMPACT,
   47         FOUND
   48 };
   49 
   50 struct ext2fs_searchslot {
   51         enum slotstatus slotstatus;
   52         doff_t  slotoffset;             /* offset of area with free space */
   53         int     slotsize;               /* size of area at slotoffset */
   54         int     slotfreespace;          /* amount of space free in slot */
   55         int     slotneeded;             /* sizeof the entry we are seeking */
   56 };
   57 
   58 /*
   59  * The new version of the directory entry.  Since EXT2 structures are
   60  * stored in intel byte order, and the name_len field could never be
   61  * bigger than 255 chars, it's safe to reclaim the extra byte for the
   62  * file_type field.
   63  */
   64 struct ext2fs_direct_2 {
   65         uint32_t e2d_ino;               /* inode number of entry */
   66         uint16_t e2d_reclen;            /* length of this record */
   67         uint8_t e2d_namlen;             /* length of string in e2d_name */
   68         uint8_t e2d_type;               /* file type */
   69         char    e2d_name[EXT2FS_MAXNAMLEN];     /* name with
   70                                                  * length<=EXT2FS_MAXNAMLEN */
   71 };
   72 
   73 /*
   74  * Maximal count of links to a file
   75  */
   76 #define EXT2_LINK_MAX   32000
   77 
   78 /*
   79  * Ext2 directory file types.  Only the low 3 bits are used.  The
   80  * other bits are reserved for now.
   81  */
   82 #define EXT2_FT_UNKNOWN         0
   83 #define EXT2_FT_REG_FILE        1
   84 #define EXT2_FT_DIR             2
   85 #define EXT2_FT_CHRDEV          3
   86 #define EXT2_FT_BLKDEV          4
   87 #define EXT2_FT_FIFO            5
   88 #define EXT2_FT_SOCK            6
   89 #define EXT2_FT_SYMLINK         7
   90 #define EXT2_FT_MAX             8
   91 
   92 /*
   93  * EXT2_DIR_PAD defines the directory entries boundaries
   94  *
   95  * NOTE: It must be a multiple of 4
   96  */
   97 #define EXT2_DIR_PAD                    4
   98 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
   99 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
  100                                          ~EXT2_DIR_ROUND)
  101 #endif  /* !_FS_EXT2FS_EXT2_DIR_H_ */

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