xref: /linux/fs/freevxfs/vxfs_olt.h (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2000-2001 Christoph Hellwig.
4  */
5 #ifndef _VXFS_OLT_H_
6 #define _VXFS_OLT_H_
7 
8 /*
9  * Veritas filesystem driver - Object Location Table data structures.
10  *
11  * This file contains definitions for the Object Location Table used
12  * by the Veritas Filesystem version 2 and newer.
13  */
14 
15 
16 /*
17  * OLT magic number (vxfs_olt->olt_magic).
18  */
19 #define VXFS_OLT_MAGIC		0xa504FCF5
20 
21 /*
22  * VxFS OLT entry types.
23  */
24 enum {
25 	VXFS_OLT_FREE	= 1,
26 	VXFS_OLT_FSHEAD	= 2,
27 	VXFS_OLT_CUT	= 3,
28 	VXFS_OLT_ILIST	= 4,
29 	VXFS_OLT_DEV	= 5,
30 	VXFS_OLT_SB	= 6
31 };
32 
33 /*
34  * VxFS OLT header.
35  *
36  * The Object Location Table header is placed at the beginning of each
37  * OLT extent.  It is used to fing certain filesystem-wide metadata, e.g.
38  * the initial inode list, the fileset header or the device configuration.
39  */
40 struct vxfs_olt {
41 	__fs32		olt_magic;	/* magic number			*/
42 	__fs32		olt_size;	/* size of this entry		*/
43 	__fs32		olt_checksum;	/* checksum of extent		*/
44 	__u32		__unused1;	/* ???				*/
45 	__fs32		olt_mtime;	/* time of last mod. (sec)	*/
46 	__fs32		olt_mutime;	/* time of last mod. (usec)	*/
47 	__fs32		olt_totfree;	/* free space in OLT extent	*/
48 	__fs32		olt_extents[2];	/* addr of this extent, replica	*/
49 	__fs32		olt_esize;	/* size of this extent		*/
50 	__fs32		olt_next[2];    /* addr of next extent, replica	*/
51 	__fs32		olt_nsize;	/* size of next extent		*/
52 	__u32		__unused2;	/* align to 8 byte boundary	*/
53 };
54 
55 /*
56  * VxFS common OLT entry (on disk).
57  */
58 struct vxfs_oltcommon {
59 	__fs32		olt_type;	/* type of this record		*/
60 	__fs32		olt_size;	/* size of this record		*/
61 };
62 
63 /*
64  * VxFS free OLT entry (on disk).
65  */
66 struct vxfs_oltfree {
67 	__fs32		olt_type;	/* type of this record		*/
68 	__fs32		olt_fsize;	/* size of this free record	*/
69 };
70 
71 /*
72  * VxFS initial-inode list (on disk).
73  */
74 struct vxfs_oltilist {
75 	__fs32	olt_type;	/* type of this record		*/
76 	__fs32	olt_size;	/* size of this record		*/
77 	__fs32		olt_iext[2];	/* initial inode list, replica	*/
78 };
79 
80 /*
81  * Current Usage Table
82  */
83 struct vxfs_oltcut {
84 	__fs32		olt_type;	/* type of this record		*/
85 	__fs32		olt_size;	/* size of this record		*/
86 	__fs32		olt_cutino;	/* inode of current usage table	*/
87 	__u8		__pad;		/* unused, 8 byte align		*/
88 };
89 
90 /*
91  * Inodes containing Superblock, Intent log and OLTs
92  */
93 struct vxfs_oltsb {
94 	__fs32		olt_type;	/* type of this record		*/
95 	__fs32		olt_size;	/* size of this record		*/
96 	__fs32		olt_sbino;	/* inode of superblock file	*/
97 	__u32		__unused1;	/* ???				*/
98 	__fs32		olt_logino[2];	/* inode of log file,replica	*/
99 	__fs32		olt_oltino[2];	/* inode of OLT, replica	*/
100 };
101 
102 /*
103  * Inode containing device configuration + it's replica
104  */
105 struct vxfs_oltdev {
106 	__fs32		olt_type;	/* type of this record		*/
107 	__fs32		olt_size;	/* size of this record		*/
108 	__fs32		olt_devino[2];	/* inode of device config files	*/
109 };
110 
111 /*
112  * Fileset header
113  */
114 struct vxfs_oltfshead {
115 	__fs32		olt_type;	/* type number			*/
116 	__fs32		olt_size;	/* size of this record		*/
117 	__fs32		olt_fsino[2];   /* inodes of fileset header	*/
118 };
119 
120 #endif /* _VXFS_OLT_H_ */
121