FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_dir.h

     /*-
      * Copyright (c) 2009 Aditya Sarawgi
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/11.0/sys/fs/ext2fs/ext2_dir.h 294504 2016-01-21 14:50:28Z pfg $
     */
    
    #ifndef _FS_EXT2FS_EXT2_DIR_H_
    #define _FS_EXT2FS_EXT2_DIR_H_
    
    /*
     * Structure of a directory entry
     */
    #define EXT2FS_MAXNAMLEN        255
    
    struct  ext2fs_direct {
            uint32_t e2d_ino;               /* inode number of entry */
            uint16_t e2d_reclen;            /* length of this record */
            uint16_t e2d_namlen;            /* length of string in e2d_name */
            char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
    };
    
    enum slotstatus {
            NONE,
            COMPACT,
            FOUND
    };
    
    struct ext2fs_searchslot {
            enum slotstatus slotstatus;
            doff_t slotoffset;      /* offset of area with free space */
            int slotsize;           /* size of area at slotoffset */
            int slotfreespace;      /* amount of space free in slot */
            int slotneeded;         /* sizeof the entry we are seeking */
    };
    
    /*
     * The new version of the directory entry.  Since EXT2 structures are
     * stored in intel byte order, and the name_len field could never be
     * bigger than 255 chars, it's safe to reclaim the extra byte for the
     * file_type field.
     */
    struct  ext2fs_direct_2 {
            uint32_t e2d_ino;               /* inode number of entry */
            uint16_t e2d_reclen;            /* length of this record */
            uint8_t e2d_namlen;             /* length of string in e2d_name */
            uint8_t e2d_type;               /* file type */
            char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
    };
    
    /*
     * Maximal count of links to a file
     */
    #define EXT2_LINK_MAX   32000
    
    /*
     * Ext2 directory file types.  Only the low 3 bits are used.  The
     * other bits are reserved for now.
     */
    #define EXT2_FT_UNKNOWN         0
    #define EXT2_FT_REG_FILE        1
    #define EXT2_FT_DIR             2
    #define EXT2_FT_CHRDEV          3
    #define EXT2_FT_BLKDEV          4
    #define EXT2_FT_FIFO            5
    #define EXT2_FT_SOCK            6
    #define EXT2_FT_SYMLINK         7
    #define EXT2_FT_MAX             8
    
    /*
     * EXT2_DIR_PAD defines the directory entries boundaries
     *
     * NOTE: It must be a multiple of 4
     */
    #define EXT2_DIR_PAD                    4
    #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
    #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
                                             ~EXT2_DIR_ROUND)
   #endif /* !_FS_EXT2FS_EXT2_DIR_H_ */
   

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