| 1 | /* $NetBSD: ext2fs_extents.h,v 1.4 2016/08/09 13:18:50 kre Exp $ */ |
| 2 | |
| 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: head/sys/fs/ext2fs/ext2_extents.h 295523 2016-02-11 15:27:14Z pfg $ |
| 29 | */ |
| 30 | |
| 31 | #ifndef _UFS_EXT2FS_EXT2FS_EXTENTS_H_ |
| 32 | #define _UFS_EXT2FS_EXT2FS_EXTENTS_H_ |
| 33 | |
| 34 | #include <sys/types.h> |
| 35 | #ifndef _KERNEL |
| 36 | #include <stdbool.h> |
| 37 | #endif |
| 38 | |
| 39 | #include <ufs/ufs/inode.h> |
| 40 | #define EXT4_EXT_MAGIC 0xf30a |
| 41 | |
| 42 | #define EXT4_EXT_CACHE_NO 0 |
| 43 | #define EXT4_EXT_CACHE_GAP 1 |
| 44 | #define EXT4_EXT_CACHE_IN 2 |
| 45 | |
| 46 | /* |
| 47 | * Ext4 file system extent on disk. |
| 48 | */ |
| 49 | struct ext4_extent { |
| 50 | uint32_t e_blk; /* first logical block */ |
| 51 | uint16_t e_len; /* number of blocks */ |
| 52 | uint16_t e_start_hi; /* high 16 bits of physical block */ |
| 53 | uint32_t e_start_lo; /* low 32 bits of physical block */ |
| 54 | }; |
| 55 | |
| 56 | /* |
| 57 | * Extent index on disk. |
| 58 | */ |
| 59 | struct ext4_extent_index { |
| 60 | uint32_t ei_blk; /* indexes logical blocks */ |
| 61 | uint32_t ei_leaf_lo; /* points to physical block of the |
| 62 | * next level */ |
| 63 | uint16_t ei_leaf_hi; /* high 16 bits of physical block */ |
| 64 | uint16_t ei_unused; |
| 65 | }; |
| 66 | |
| 67 | /* |
| 68 | * Extent tree header. |
| 69 | */ |
| 70 | struct { |
| 71 | uint16_t ; /* magic number: 0xf30a */ |
| 72 | uint16_t ; /* number of valid entries */ |
| 73 | uint16_t ; /* capacity of store in entries */ |
| 74 | uint16_t ; /* the depth of extent tree */ |
| 75 | uint32_t ; /* generation of extent tree */ |
| 76 | }; |
| 77 | |
| 78 | /* |
| 79 | * Save cached extent. |
| 80 | */ |
| 81 | struct ext4_extent_cache { |
| 82 | daddr_t ec_start; /* extent start */ |
| 83 | uint32_t ec_blk; /* logical block */ |
| 84 | uint32_t ec_len; |
| 85 | uint32_t ec_type; |
| 86 | }; |
| 87 | |
| 88 | /* |
| 89 | * Save path to some extent. |
| 90 | */ |
| 91 | struct ext4_extent_path { |
| 92 | uint16_t ep_depth; |
| 93 | struct buf *ep_bp; |
| 94 | bool ep_is_sparse; |
| 95 | union { |
| 96 | struct ext4_extent ep_sparse_ext; |
| 97 | struct ext4_extent *ep_ext; |
| 98 | }; |
| 99 | struct ext4_extent_index *ep_index; |
| 100 | struct ext4_extent_header *; |
| 101 | }; |
| 102 | |
| 103 | struct inode; |
| 104 | struct m_ext2fs; |
| 105 | |
| 106 | int ext4_ext_in_cache(struct inode *, daddr_t, struct ext4_extent *); |
| 107 | void ext4_ext_put_cache(struct inode *, struct ext4_extent *, int); |
| 108 | struct ext4_extent_path *ext4_ext_find_extent(struct m_ext2fs *fs, |
| 109 | struct inode *, daddr_t, struct ext4_extent_path *); |
| 110 | |
| 111 | #endif /* !_UFS_EXT2FS_EXT2FS_EXTENTS_H_ */ |
| 112 | |