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_extents.h

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    1 /*-
    2  * Copyright (c) 2012, 2010 Zheng Liu <lz@freebsd.org>
    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/10.2/sys/fs/ext2fs/ext2_extents.h 262723 2014-03-04 03:10:31Z pfg $
   27  */
   28 #ifndef _FS_EXT2FS_EXT2_EXTENTS_H_
   29 #define _FS_EXT2FS_EXT2_EXTENTS_H_
   30 
   31 #include <sys/types.h>
   32 
   33 #define EXT4_EXT_MAGIC  0xf30a
   34 
   35 #define EXT4_EXT_CACHE_NO       0
   36 #define EXT4_EXT_CACHE_GAP      1
   37 #define EXT4_EXT_CACHE_IN       2
   38 
   39 /*
   40  * Ext4 file system extent on disk.
   41  */
   42 struct ext4_extent {
   43         uint32_t e_blk; /* first logical block */
   44         uint16_t e_len; /* number of blocks */
   45         uint16_t e_start_hi;    /* high 16 bits of physical block */
   46         uint32_t e_start_lo;    /* low 32 bits of physical block */
   47 };
   48 
   49 /*
   50  * Extent index on disk.
   51  */
   52 struct ext4_extent_index {
   53         uint32_t ei_blk;        /* indexes logical blocks */
   54         uint32_t ei_leaf_lo;    /* points to physical block of the
   55                                  * next level */
   56         uint16_t ei_leaf_hi;    /* high 16 bits of physical block */
   57         uint16_t ei_unused;
   58 };
   59 
   60 /*
   61  * Extent tree header.
   62  */
   63 struct ext4_extent_header {
   64         uint16_t eh_magic;      /* magic number: 0xf30a */
   65         uint16_t eh_ecount;     /* number of valid entries */
   66         uint16_t eh_max;        /* capacity of store in entries */
   67         uint16_t eh_depth;      /* the depth of extent tree */
   68         uint32_t eh_gen;        /* generation of extent tree */
   69 };
   70 
   71 /*
   72  * Save cached extent.
   73  */
   74 struct ext4_extent_cache {
   75         daddr_t ec_start;       /* extent start */
   76         uint32_t ec_blk;        /* logical block */
   77         uint32_t ec_len;
   78         uint32_t ec_type;
   79 };
   80 
   81 /*
   82  * Save path to some extent.
   83  */
   84 struct ext4_extent_path {
   85         uint16_t ep_depth;
   86         struct buf *ep_bp;
   87         struct ext4_extent *ep_ext;
   88         struct ext4_extent_index *ep_index;
   89         struct ext4_extent_header *ep_header;
   90 };
   91 
   92 struct inode;
   93 struct m_ext2fs;
   94 int     ext4_ext_in_cache(struct inode *, daddr_t, struct ext4_extent *);
   95 void    ext4_ext_put_cache(struct inode *, struct ext4_extent *, int);
   96 struct ext4_extent_path *ext4_ext_find_extent(struct m_ext2fs *fs,
   97     struct inode *, daddr_t, struct ext4_extent_path *);
   98 
   99 #endif /* !_FS_EXT2FS_EXT2_EXTENTS_H_ */

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