1 /*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
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 * without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30 #ifndef _VXFS_OLT_H_
31 #define _VXFS_OLT_H_
32
33 /*
34 * Veritas filesystem driver - Object Location Table data structures.
35 *
36 * This file contains definitions for the Object Location Table used
37 * by the Veritas Filesystem version 2 and newer.
38 */
39
40
41 /*
42 * OLT magic number (vxfs_olt->olt_magic).
43 */
44 #define VXFS_OLT_MAGIC 0xa504FCF5
45
46 /*
47 * VxFS OLT entry types.
48 */
49 enum {
50 VXFS_OLT_FREE = 1,
51 VXFS_OLT_FSHEAD = 2,
52 VXFS_OLT_CUT = 3,
53 VXFS_OLT_ILIST = 4,
54 VXFS_OLT_DEV = 5,
55 VXFS_OLT_SB = 6
56 };
57
58 /*
59 * VxFS OLT header.
60 *
61 * The Object Location Table header is placed at the beginning of each
62 * OLT extent. It is used to fing certain filesystem-wide metadata, e.g.
63 * the initial inode list, the fileset header or the device configuration.
64 */
65 struct vxfs_olt {
66 __fs32 olt_magic; /* magic number */
67 __fs32 olt_size; /* size of this entry */
68 __fs32 olt_checksum; /* checksum of extent */
69 __u32 __unused1; /* ??? */
70 __fs32 olt_mtime; /* time of last mod. (sec) */
71 __fs32 olt_mutime; /* time of last mod. (usec) */
72 __fs32 olt_totfree; /* free space in OLT extent */
73 __fs32 olt_extents[2]; /* addr of this extent, replica */
74 __fs32 olt_esize; /* size of this extent */
75 __fs32 olt_next[2]; /* addr of next extent, replica */
76 __fs32 olt_nsize; /* size of next extent */
77 __u32 __unused2; /* align to 8 byte boundary */
78 };
79
80 /*
81 * VxFS common OLT entry (on disk).
82 */
83 struct vxfs_oltcommon {
84 __fs32 olt_type; /* type of this record */
85 __fs32 olt_size; /* size of this record */
86 };
87
88 /*
89 * VxFS free OLT entry (on disk).
90 */
91 struct vxfs_oltfree {
92 __fs32 olt_type; /* type of this record */
93 __fs32 olt_fsize; /* size of this free record */
94 };
95
96 /*
97 * VxFS initial-inode list (on disk).
98 */
99 struct vxfs_oltilist {
100 __fs32 olt_type; /* type of this record */
101 __fs32 olt_size; /* size of this record */
102 __fs32 olt_iext[2]; /* initial inode list, replica */
103 };
104
105 /*
106 * Current Usage Table
107 */
108 struct vxfs_oltcut {
109 __fs32 olt_type; /* type of this record */
110 __fs32 olt_size; /* size of this record */
111 __fs32 olt_cutino; /* inode of current usage table */
112 __u8 __pad; /* unused, 8 byte align */
113 };
114
115 /*
116 * Inodes containing Superblock, Intent log and OLTs
117 */
118 struct vxfs_oltsb {
119 __fs32 olt_type; /* type of this record */
120 __fs32 olt_size; /* size of this record */
121 __fs32 olt_sbino; /* inode of superblock file */
122 __u32 __unused1; /* ??? */
123 __fs32 olt_logino[2]; /* inode of log file,replica */
124 __fs32 olt_oltino[2]; /* inode of OLT, replica */
125 };
126
127 /*
128 * Inode containing device configuration + it's replica
129 */
130 struct vxfs_oltdev {
131 __fs32 olt_type; /* type of this record */
132 __fs32 olt_size; /* size of this record */
133 __fs32 olt_devino[2]; /* inode of device config files */
134 };
135
136 /*
137 * Fileset header
138 */
139 struct vxfs_oltfshead {
140 __fs32 olt_type; /* type number */
141 __fs32 olt_size; /* size of this record */
142 __fs32 olt_fsino[2]; /* inodes of fileset header */
143 };
144
145 #endif /* _VXFS_OLT_H_ */