aboutsummaryrefslogtreecommitdiff
path: root/fs/freevxfs/vxfs_olt.h
blob: 0c0b0c9fa5579b4b54ccb67c5bf3b214916ac767 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
#ifndef _VXFS_OLT_H_
#define _VXFS_OLT_H_

/*
 * Veritas filesystem driver - Object Location Table data structures.
 *
 * This file contains definitions for the Object Location Table used
 * by the Veritas Filesystem version 2 and newer.
 */


/*
 * OLT magic number (vxfs_olt->olt_magic).
 */
#define VXFS_OLT_MAGIC		0xa504FCF5

/*
 * VxFS OLT entry types.
 */
enum {
	VXFS_OLT_FREE	= 1,
	VXFS_OLT_FSHEAD	= 2,
	VXFS_OLT_CUT	= 3,
	VXFS_OLT_ILIST	= 4,
	VXFS_OLT_DEV	= 5,
	VXFS_OLT_SB	= 6
};

/*
 * VxFS OLT header.
 *
 * The Object Location Table header is placed at the beginning of each
 * OLT extent.  It is used to fing certain filesystem-wide metadata, e.g.
 * the initial inode list, the fileset header or the device configuration.
 */
struct vxfs_olt {
	__fs32		olt_magic;	/* magic number			*/
	__fs32		olt_size;	/* size of this entry		*/
	__fs32		olt_checksum;	/* checksum of extent		*/
	__u32		__unused1;	/* ???				*/
	__fs32		olt_mtime;	/* time of last mod. (sec)	*/
	__fs32		olt_mutime;	/* time of last mod. (usec)	*/
	__fs32		olt_totfree;	/* free space in OLT extent	*/
	__fs32		olt_extents[2];	/* addr of this extent, replica	*/
	__fs32		olt_esize;	/* size of this extent		*/
	__fs32		olt_next[2];    /* addr of next extent, replica	*/
	__fs32		olt_nsize;	/* size of next extent		*/
	__u32		__unused2;	/* align to 8 byte boundary	*/
};

/*
 * VxFS common OLT entry (on disk).
 */
struct vxfs_oltcommon {
	__fs32		olt_type;	/* type of this record		*/
	__fs32		olt_size;	/* size of this record		*/
};

/*
 * VxFS free OLT entry (on disk).
 */
struct vxfs_oltfree {
	__fs32		olt_type;	/* type of this record		*/
	__fs32		olt_fsize;	/* size of this free record	*/
};

/*
 * VxFS initial-inode list (on disk).
 */
struct vxfs_oltilist {
	__fs32	olt_type;	/* type of this record		*/
	__fs32	olt_size;	/* size of this record		*/
	__fs32		olt_iext[2];	/* initial inode list, replica	*/
};

/*
 * Current Usage Table 
 */
struct vxfs_oltcut {
	__fs32		olt_type;	/* type of this record		*/
	__fs32		olt_size;	/* size of this record		*/
	__fs32		olt_cutino;	/* inode of current usage table	*/
	__u8		__pad;		/* unused, 8 byte align		*/
};

/*
 * Inodes containing Superblock, Intent log and OLTs 
 */
struct vxfs_oltsb {
	__fs32		olt_type;	/* type of this record		*/
	__fs32		olt_size;	/* size of this record		*/
	__fs32		olt_sbino;	/* inode of superblock file	*/
	__u32		__unused1;	/* ???				*/
	__fs32		olt_logino[2];	/* inode of log file,replica	*/
	__fs32		olt_oltino[2];	/* inode of OLT, replica	*/
};

/*
 * Inode containing device configuration + it's replica 
 */
struct vxfs_oltdev {
	__fs32		olt_type;	/* type of this record		*/
	__fs32		olt_size;	/* size of this record		*/
	__fs32		olt_devino[2];	/* inode of device config files	*/
};

/*
 * Fileset header 
 */
struct vxfs_oltfshead {
	__fs32		olt_type;	/* type number			*/
	__fs32		olt_size;	/* size of this record		*/
	__fs32		olt_fsino[2];   /* inodes of fileset header	*/
};

#endif /* _VXFS_OLT_H_ */