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 | |