[linux.git] / fs / freevxfs / vxfs_olt.h

/*
 * 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_ */
Commit	Line	Data
1da177e4 LT	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.
25985edc	63	* the initial inode list, the fileset header or the device configuration.
1da177e4 LT	64	*/
1da177e4 LT	65	struct vxfs_olt {
0d83f7fc KB	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 */
1da177e4 LT	78	};
	79
	80	/*
	81	* VxFS common OLT entry (on disk).
	82	*/
	83	struct vxfs_oltcommon {
0d83f7fc KB	84	__fs32 olt_type; /* type of this record */
0d83f7fc KB	85	__fs32 olt_size; /* size of this record */
1da177e4 LT	86	};
	87
	88	/*
	89	* VxFS free OLT entry (on disk).
	90	*/
	91	struct vxfs_oltfree {
0d83f7fc KB	92	__fs32 olt_type; /* type of this record */
0d83f7fc KB	93	__fs32 olt_fsize; /* size of this free record */
1da177e4 LT	94	};
	95
	96	/*
	97	* VxFS initial-inode list (on disk).
	98	*/
	99	struct vxfs_oltilist {
0d83f7fc KB	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 */
1da177e4 LT	103	};
	104
	105	/*
	106	* Current Usage Table
	107	*/
	108	struct vxfs_oltcut {
0d83f7fc KB	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 */
1da177e4 LT	113	};
	114
	115	/*
	116	* Inodes containing Superblock, Intent log and OLTs
	117	*/
	118	struct vxfs_oltsb {
0d83f7fc KB	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 */
1da177e4 LT	125	};
	126
	127	/*
	128	* Inode containing device configuration + it's replica
	129	*/
	130	struct vxfs_oltdev {
0d83f7fc KB	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 */
1da177e4 LT	134	};
	135
	136	/*
	137	* Fileset header
	138	*/
	139	struct vxfs_oltfshead {
0d83f7fc KB	140	__fs32 olt_type; /* type number */
	141	__fs32 olt_size; /* size of this record */
	142	__fs32 olt_fsino[2]; /* inodes of fileset header */
1da177e4 LT	143	};
	144
	145	#endif /* _VXFS_OLT_H_ */