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 */
 49enum {
 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 */
 65struct 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 */
 83struct 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 */
 91struct 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 */
 99struct 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 */
108struct 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 */
118struct 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 */
130struct 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 */
139struct 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_ */