FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_extents.h

     /*-
      * Copyright (c) 2012, 2010 Zheng Liu <lz@freebsd.org>
      * 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.
     *
     * $FreeBSD$
     */
    #ifndef _FS_EXT2FS_EXT2_EXTENTS_H_
    #define _FS_EXT2FS_EXT2_EXTENTS_H_
    
    #include <sys/types.h>
    
    #define EXT4_EXT_MAGIC  0xf30a
    
    #define EXT4_EXT_CACHE_NO       0
    #define EXT4_EXT_CACHE_GAP      1
    #define EXT4_EXT_CACHE_IN       2
    
    /*
     * Ext4 file system extent on disk.
     */
    struct ext4_extent {
            uint32_t e_blk; /* first logical block */
            uint16_t e_len; /* number of blocks */
            uint16_t e_start_hi;    /* high 16 bits of physical block */
            uint32_t e_start_lo;    /* low 32 bits of physical block */
    };
    
    /*
     * Extent index on disk.
     */
    struct ext4_extent_index {
            uint32_t ei_blk;        /* indexes logical blocks */
            uint32_t ei_leaf_lo;    /* points to physical block of the
                                     * next level */
            uint16_t ei_leaf_hi;    /* high 16 bits of physical block */
            uint16_t ei_unused;
    };
    
    /*
     * Extent tree header.
     */
    struct ext4_extent_header {
            uint16_t eh_magic;              /* magic number: 0xf30a */
            uint16_t eh_ecount;             /* number of valid entries */
            uint16_t eh_max;                /* capacity of store in entries */
            uint16_t eh_depth;              /* the depth of extent tree */
            uint32_t eh_gen;                /* generation of extent tree */
    };
    
    /*
     * Save cached extent.
     */
    struct ext4_extent_cache {
            daddr_t ec_start;               /* extent start */
            uint32_t ec_blk;                /* logical block */
            uint32_t ec_len;
            uint32_t ec_type;
    };
    
    /*
     * Save path to some extent.
     */
    struct ext4_extent_path {
            uint16_t ep_depth;
            struct buf *ep_bp;
            struct ext4_extent *ep_ext;
            struct ext4_extent_index *ep_index;
            struct ext4_extent_header *ep_header;
    };
    
    struct inode;
    struct m_ext2fs;
    int     ext4_ext_in_cache(struct inode *, daddr_t, struct ext4_extent *);
    void    ext4_ext_put_cache(struct inode *, struct ext4_extent *, int);
    struct ext4_extent_path *
    ext4_ext_find_extent(struct m_ext2fs *fs,
        struct inode *, daddr_t, struct ext4_extent_path *);
    
   #endif  /* !_FS_EXT2FS_EXT2_EXTENTS_H_ */

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