/*	$OpenBSD: ufsmount.h,v 1.13 2016/02/27 18:50:38 natano Exp $	*/
/*	$NetBSD: ufsmount.h,v 1.4 1994/12/21 20:00:23 mycroft Exp $	*/

/*
 * 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. 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	8.4 (Berkeley) 10/27/94
 */

struct buf;
struct inode;
struct nameidata;
struct timeval;
struct ucred;
struct uio;
struct vnode;
struct netexport;

/* 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 */
	u_long	um_fstype;			/* type of file system */

	union {					/* pointer to superblock */
		struct	fs *fs;			/* FFS */
		struct  m_ext2fs *e2fs;		/* EXT2FS */
	} ufsmount_u;
#define	um_fs		ufsmount_u.fs
#define	um_e2fs		ufsmount_u.e2fs
#define	um_e2fsb	ufsmount_u.e2fs->s_es

	struct	vnode *um_quotas[MAXQUOTAS];	/* pointer to quota files */
	struct	ucred *um_cred[MAXQUOTAS];	/* quota file access cred */
	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 */
	time_t	um_btime[MAXQUOTAS];		/* block quota time limit */
	time_t	um_itime[MAXQUOTAS];		/* inode quota time limit */
	char	um_qflags[MAXQUOTAS];		/* quota specific flags */
	struct	netexport um_export;		/* export information */
	u_int64_t um_savedmaxfilesize;		/* XXX - limit maxfilesize */
	u_int	um_maxsymlinklen;		/* max size of short symlink */
};

/*
 * Filesystem types
 */
#define	UM_UFS1	1
#define	UM_UFS2	2
#define	UM_EXT2FS	3

/*
 * Flags describing the state of quotas.
 */
#define	QTF_OPENING	0x01			/* Q_QUOTAON in progress */
#define	QTF_CLOSING	0x02			/* Q_QUOTAOFF in progress */

/* 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)