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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012, 2010 Zheng Liu <lz@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/fs/ext2fs/ext2_extents.h 333584 2018-05-13 19:19:10Z fsu $
   29  */
   30 #ifndef _FS_EXT2FS_EXT2_EXTENTS_H_
   31 #define _FS_EXT2FS_EXT2_EXTENTS_H_
   32 
   33 #include <sys/types.h>
   34 
   35 #define EXT4_EXT_MAGIC  0xf30a
   36 #define EXT4_MAX_BLOCKS 0xffffffff
   37 #define EXT_INIT_MAX_LEN (1UL << 15)
   38 #define EXT4_MAX_LEN    (EXT_INIT_MAX_LEN - 1)
   39 #define EXT4_EXT_DEPTH_MAX 5
   40 
   41 #define EXT4_EXT_CACHE_NO       0
   42 #define EXT4_EXT_CACHE_GAP      1
   43 #define EXT4_EXT_CACHE_IN       2
   44 
   45 /*
   46  * Ext4 extent tail with csum
   47  */
   48 struct ext4_extent_tail {
   49         uint32_t et_checksum;   /* crc32c(uuid+inum+extent_block) */
   50 };
   51 
   52 /*
   53  * Ext4 file system extent on disk.
   54  */
   55 struct ext4_extent {
   56         uint32_t e_blk;                 /* first logical block */
   57         uint16_t e_len;                 /* number of blocks */
   58         uint16_t e_start_hi;            /* high 16 bits of physical block */
   59         uint32_t e_start_lo;            /* low 32 bits of physical block */
   60 };
   61 
   62 /*
   63  * Extent index on disk.
   64  */
   65 struct ext4_extent_index {
   66         uint32_t ei_blk;        /* indexes logical blocks */
   67         uint32_t ei_leaf_lo;    /* points to physical block of the
   68                                  * next level */
   69         uint16_t ei_leaf_hi;    /* high 16 bits of physical block */
   70         uint16_t ei_unused;
   71 };
   72 
   73 /*
   74  * Extent tree header.
   75  */
   76 struct ext4_extent_header {
   77         uint16_t eh_magic;              /* magic number: 0xf30a */
   78         uint16_t eh_ecount;             /* number of valid entries */
   79         uint16_t eh_max;                /* capacity of store in entries */
   80         uint16_t eh_depth;              /* the depth of extent tree */
   81         uint32_t eh_gen;                /* generation of extent tree */
   82 };
   83 
   84 /*
   85  * Save cached extent.
   86  */
   87 struct ext4_extent_cache {
   88         daddr_t ec_start;               /* extent start */
   89         uint32_t ec_blk;                /* logical block */
   90         uint32_t ec_len;
   91         uint32_t ec_type;
   92 };
   93 
   94 /*
   95  * Save path to some extent.
   96  */
   97 struct ext4_extent_path {
   98         int index_count;
   99         uint16_t ep_depth;
  100         uint64_t ep_blk;
  101         char *ep_data;
  102         struct ext4_extent *ep_ext;
  103         struct ext4_extent_index *ep_index;
  104         struct ext4_extent_header *ep_header;
  105 };
  106 
  107 #define EXT_FIRST_EXTENT(hdr) ((struct ext4_extent *)(((char *)(hdr)) + \
  108     sizeof(struct ext4_extent_header)))
  109 #define EXT_FIRST_INDEX(hdr) ((struct ext4_extent_index *)(((char *)(hdr)) + \
  110     sizeof(struct ext4_extent_header)))
  111 #define EXT_LAST_EXTENT(hdr) (EXT_FIRST_EXTENT((hdr)) + (hdr)->eh_ecount - 1)
  112 #define EXT_LAST_INDEX(hdr) (EXT_FIRST_INDEX((hdr)) + (hdr)->eh_ecount - 1)
  113 #define EXT4_EXTENT_TAIL_OFFSET(hdr) (sizeof(struct ext4_extent_header) + \
  114     (sizeof(struct ext4_extent) * (hdr)->eh_max))
  115 #define EXT_HAS_FREE_INDEX(path) \
  116     ((path)->ep_header->eh_ecount < (path)->ep_header->eh_max)
  117 #define EXT_MAX_EXTENT(hdr) (EXT_FIRST_EXTENT(hdr) + ((hdr)->eh_max) - 1)
  118 #define EXT_MAX_INDEX(hdr) (EXT_FIRST_INDEX((hdr)) + (hdr)->eh_max - 1)
  119 
  120 struct inode;
  121 struct m_ext2fs;
  122 void    ext4_ext_tree_init(struct inode *ip);
  123 int     ext4_ext_in_cache(struct inode *, daddr_t, struct ext4_extent *);
  124 void    ext4_ext_put_cache(struct inode *, struct ext4_extent *, int);
  125 int ext4_ext_find_extent(struct inode *, daddr_t, struct ext4_extent_path **);
  126 void ext4_ext_path_free(struct ext4_extent_path *path);
  127 int ext4_ext_remove_space(struct inode *ip, off_t length, int flags,
  128     struct ucred *cred, struct thread *td);
  129 int ext4_ext_get_blocks(struct inode *ip, int64_t iblock,
  130     unsigned long max_blocks, struct ucred *cred, struct buf **bpp,
  131     int *allocate, daddr_t *);
  132 #ifdef EXT2FS_DEBUG
  133 void ext4_ext_print_extent_tree_status(struct inode *ip);
  134 #endif
  135 
  136 #endif  /* !_FS_EXT2FS_EXT2_EXTENTS_H_ */

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