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_ */
146