xnu-792.13.8.tar.gz

[apple/xnu.git] / bsd / ufs / ufs / ufsmount.h

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The Original Code and all software distributed under the License are 
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
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 * Please see the License for the specific language governing rights and 
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 * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *	The Regents of the University of California.  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.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)ufsmount.h	8.6 (Berkeley) 3/30/95
 */
#ifndef _UFS_UFSMOUNT_H_
#define _UFS_UFSMOUNT_H_

#include <sys/appleapiopts.h>

#include <sys/quota.h>

#ifdef __APPLE_API_UNSTABLE
/*
 * Arguments to mount UFS-based filesystems
 */
struct ufs_args {
	char	*fspec;			/* block special device to mount */
};
#endif /* __APPLE_API_UNSTABLE */

#ifdef __APPLE_API_OBSOLETE
#if MFS
/*
 * Arguments to mount MFS
 */
struct mfs_args {
	char	*fspec;			/* name to export for statfs */
	caddr_t	base;			/* base of file system in memory */
	u_long	size;			/* size of file system */
};
#endif /* MFS */
#endif /* __APPLE_API_OBSOLETE */

#ifdef KERNEL
#ifdef __APPLE_API_PRIVATE
struct fs;
struct mount;
struct vnode;

/* This structure describes the UFS specific mount structure data. */
struct ufsmount {
	struct	mount *um_mountp;		/* filesystem vfs structure */
	dev_t	um_dev;				/* device mounted */
	struct	vnode *um_devvp;		/* block device mounted vnode */

	union {					/* pointer to superblock */
		struct	fs *fs;			/* FFS */
	} ufsmount_u;
#define	um_fs	ufsmount_u.fs

	struct	quotafile um_qfiles[MAXQUOTAS];	/* quota files */
	u_long	um_nindir;			/* indirect ptrs per block */
	u_long	um_bptrtodb;			/* indir ptr to disk block */
	u_long	um_seqinc;			/* inc between seq blocks */
	int64_t	um_savedmaxfilesize;		/* XXX - limit maxfilesize */
};


/* Convert mount ptr to ufsmount ptr. */
#define VFSTOUFS(mp)	((struct ufsmount *)((mp)->mnt_data))

/*
 * Macros to access file system parameters in the ufsmount structure.
 * Used by ufs_bmap.
 */
#define MNINDIR(ump)			((ump)->um_nindir)
#define	blkptrtodb(ump, b)		((b) << (ump)->um_bptrtodb)
#define	is_sequential(ump, a, b)	((b) == (a) + ump->um_seqinc)
#endif /* __APPLE_API_PRIVATE */
#endif /* KERNEL */

#endif /* ! _UFS_UFSMOUNT_H_ */