/*	@(#)vfs.h	4.1	(ULTRIX)	7/2/90	*//************************************************************************ *									* *			Copyright (c) 1986 by				* *		Digital Equipment Corporation, Maynard, MA		* *			All rights reserved.				* *									* *   This software is furnished under a license and may be used and	* *   copied  only  in accordance with the terms of such license and	* *   with the  inclusion  of  the  above  copyright  notice.   This	* *   software  or  any  other copies thereof may not be provided or	* *   otherwise made available to any other person.  No title to and	* *   ownership of the software is hereby transferred.			* *									* *   This software is  derived  from  software  received  from  the	* *   University    of   California,   Berkeley,   and   from   Bell	* *   Laboratories.  Use, duplication, or disclosure is  subject  to	* *   restrictions  under  license  agreements  with  University  of	* *   California and with AT&T.						* *									* *   The information in this software is subject to change  without	* *   notice  and should not be construed as a commitment by Digital	* *   Equipment Corporation.						* *									* *   Digital assumes no responsibility for the use  or  reliability	* *   of its software on equipment which is not supplied by Digital.	* *									* ************************************************************************//* *	Portions of this software have been licensed to  *	Digital Equipment Company, Maynard, MA. *	Copyright (c) 1986 Sun Microsystems, Inc.  ALL RIGHTS RESERVED. *//* * Structure per mounted file system. * Each mounted file system has an array of * operations and an instance record. * The file systems are put on a singly linked list. */struct vfs {	struct vfs	*vfs_next;		/* next vfs in vfs list */	struct vnode	*vfs_vnodecovered;	/* vnode we mounted on */	int		vfs_flag;		/* flags */	int		vfs_bsize;		/* native block size */	u_short		vfs_exroot;		/* exported fs uid 0 mapping */	short		vfs_exflags;		/* exported fs flags */	caddr_t		vfs_data;		/* private data */};/* the v_fs_data structure is an overlay for the fs_data structure *//* to make nfs faster and cleaner we only malloc the fs_data structure *//* and use the spare area in the end for the mntinfo and vfs structures *//* ALWAYS USE THE TWO MACROS TO GET TO THE MNTINFO AND VFS STRUCTURES */struct v_fs_data {		struct fs_data_req fd_req;	/* required by gfs - mount.h */		union {			u_int	fd_spare[112];	/* lots of room left, use it */			struct gfs_vfs {	/* keep the # of fd_spare in */				struct mntinfo mi;	/* sync with mount.h */				struct vfs vfs;			} gvfs;		} fd_un;};#define MP_TO_MIP(mp)	((struct mntinfo *) &(((struct v_fs_data *) \					(mp->m_fs_data))->fd_un.gvfs.mi))#define MP_TO_VFSP(mp)  ((struct vfs *) &(((struct v_fs_data *) \					(mp->m_fs_data))->fd_un.gvfs.vfs))/* * vfs flags. * VFS_MLOCK lock the vfs so that name lookup cannot proceed past the vfs. * This keeps the subtree stable during mounts and unmounts. */#define VFS_RDONLY	0x01		/* read only vfs */#define VFS_MLOCK	0x02		/* lock vfs so that subtree is stable */#define VFS_MWAIT	0x04		/* someone is waiting for lock */#define VFS_NOSUID	0x08		/* someone is waiting for lock */#define	VFS_EXPORTED	0x10		/* file system is exported (NFS) *//* * exported vfs flags. */#define	EX_RDONLY	0x01		/* exported read only */#define EXPORTFS_CREATE	0x01		/* create a new export record */#define EXPORTFS_REMOVE	0x02		/* remove an old export record */#define EXPORTFS_READ	0x03		/* read an old export record */struct exportfsdata {	int  e_flags;	char e_path[MAXPATHLEN];	dev_t	e_fsid;	u_long	e_gnum;	u_long	e_gen;	short	e_rootmap;	int	e_more;};/* * file system statistics */typedef long fsid_t[2];			/* file system id type */struct statfs {	long f_type;			/* type of info, zero for now */	long f_bsize;			/* fundamental file system block size */	long f_blocks;			/* total blocks in file system */	long f_bfree;			/* free block in fs */	long f_bavail;			/* free blocks avail to non-superuser */	long f_files;			/* total file nodes in file system */	long f_ffree;			/* free file nodes in fs */	fsid_t f_fsid;			/* file system id */	long f_spare[7];		/* spare for later */};#ifdef KERNEL/* * public operations */extern void	vfs_mountroot();	/* mount the root */extern int	vfs_add();		/* add a new vfs to mounted vfs list */extern void	vfs_remove();		/* remove a vfs from mounted vfs list */extern int	vfs_lock();		/* lock a vfs */extern void	vfs_unlock();		/* unlock a vfs */#define VFS_INIT(VFSP, DATA)	{ \	(VFSP)->vfs_next = (struct vfs *)0; \	(VFSP)->vfs_flag = 0; \	(VFSP)->vfs_exflags = 0; \	(VFSP)->vfs_data = (DATA); \}/* * globals */extern struct vfs *rootvfs;		/* ptr to root vfs structure */#endif /* KERNEL */