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Apply the NFS exports list rototill patch:

- Remove all NFS related stuff from file system specific code.
- Drop the vfs_checkexp hook and generalize it in the new nfs_check_export
  function, thus removing redundancy from all file systems.
- Move all NFS export-related stuff from kern/vfs_subr.c to the new
  file sys/nfs/nfs_export.c.  The former was becoming large and its code
  is always compiled, regardless of the build options.  Using the latter,
  the code is only compiled in when NFSSERVER is enabled.  While doing this,
  also make some functions in nfs_subs.c conditional to NFSSERVER.
- Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a
  path and a set of export entries.  At the moment it can only clear the
  exports list or append entries, one by one, but it is done in a way that
  allows setting the whole set of entries atomically in the future (see the
  comment in mountd_set_exports_list or in doc/TODO).
- Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so
  that it becomes file system agnostic.  In fact, all this whole thing was
  done to remove a 'XXX' block from this utility!
- Change the mount*, newfs and fsck* userland utilities to not deal with NFS
  exports initialization; done internally by the kernel when initializing
  the NFS support for each file system.
- Implement an interface for VFS (called VFS hooks) so that several kernel
  subsystems can run arbitrary code upon receipt of specific VFS events.
  At the moment, this only provides support for unmount and is used to
  destroy NFS exports lists from the file systems being unmounted, though it
  has room for extension.

Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments
and advice in the development of this patch.

/*	$NetBSD: fstypes.h,v 1.6 2005/09/23 12:10:33 jmmv Exp $	*/

/*
 * Copyright (c) 1989, 1991, 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.
 *
 *	@(#)mount.h	8.21 (Berkeley) 5/20/95
 */

#ifndef _SYS_FSTYPES_H_
#define _SYS_FSTYPES_H_

typedef struct { int32_t __fsid_val[2]; } fsid_t; /* file system id type */

/*
 * File identifier.
 * These are unique per filesystem on a single machine.
 */
#define	_VFS_MAXFIDSZ	16

struct fid {
	unsigned short	fid_len;		/* length of data in bytes */
	unsigned short	fid_reserved;		/* force longword alignment */
	char		fid_data[_VFS_MAXFIDSZ];/* data (variable length) */
};

#if defined(_NETBSD_SOURCE)
#define	VFS_MAXFIDSZ	_VFS_MAXFIDSZ
#endif

/*
 * Generic file handle
 */
struct fhandle {
	fsid_t	fh_fsid;	/* File system id of mount point */
	struct	fid fh_fid;	/* File sys specific id */
};
typedef struct fhandle	fhandle_t;

/*
 * Mount flags.  XXX BEWARE: these are not in numerical order!
 *
 * Unmount uses MNT_FORCE flag.
 *
 * Note that all mount flags are listed here.  if you need to add one, take
 * one of the __MNT_UNUSED flags.
 */

#define	__MNT_UNUSED3	0x00020000
#define	__MNT_UNUSED4	0x00200000
#define	__MNT_UNUSED5	0x01000000
#define	__MNT_UNUSED6	0x02000000

#define	MNT_RDONLY	0x00000001	/* read only filesystem */
#define	MNT_SYNCHRONOUS	0x00000002	/* file system written synchronously */
#define	MNT_NOEXEC	0x00000004	/* can't exec from filesystem */
#define	MNT_NOSUID	0x00000008	/* don't honor setuid bits on fs */
#define	MNT_NODEV	0x00000010	/* don't interpret special files */
#define	MNT_UNION	0x00000020	/* union with underlying filesystem */
#define	MNT_ASYNC	0x00000040	/* file system written asynchronously */
#define	MNT_NOCOREDUMP	0x00008000	/* don't write core dumps to this FS */
#define MNT_IGNORE	0x00100000	/* don't show entry in df */
#define	MNT_MAGICLINKS	0x00800000	/* interpret symlinks for magic names */
#define MNT_NOATIME	0x04000000	/* Never update access times in fs */
#define MNT_SYMPERM	0x20000000	/* recognize symlink permission */
#define MNT_NODEVMTIME	0x40000000	/* Never update mod times for devs */
#define MNT_SOFTDEP	0x80000000	/* Use soft dependencies */

#define __MNT_BASIC_FLAGS \
	{ MNT_RDONLY,		0,	"read-only" }, \
	{ MNT_SYNCHRONOUS,	0,	"synchronous" }, \
	{ MNT_NOEXEC,		0,	"noexec" }, \
	{ MNT_NOSUID,		0,	"nosuid" }, \
	{ MNT_NODEV,		0,	"nodev" }, \
	{ MNT_UNION,		0,	"union" }, \
	{ MNT_ASYNC,		0,	"asynchronous" }, \
	{ MNT_NOCOREDUMP,	0,	"nocoredump" }, \
	{ MNT_IGNORE,		0,	"hidden" }, \
	{ MNT_NOATIME,		0,	"noatime" }, \
	{ MNT_SYMPERM,		0,	"symperm" }, \
	{ MNT_NODEVMTIME,	0,	"nodevmtime" }, \
	{ MNT_MAGICLINKS,	0,	"magiclinks" }, \
	{ MNT_SOFTDEP,		0,	"soft dependencies" },

/*
 * exported mount flags.
 */
#define	MNT_EXRDONLY	0x00000080	/* exported read only */
#define	MNT_EXPORTED	0x00000100	/* file system is exported */
#define	MNT_DEFEXPORTED	0x00000200	/* exported to the world */
#define	MNT_EXPORTANON	0x00000400	/* use anon uid mapping for everyone */
#define	MNT_EXKERB	0x00000800	/* exported with Kerberos uid mapping */
#define MNT_EXNORESPORT	0x08000000	/* don't enforce reserved ports (NFS) */
#define MNT_EXPUBLIC	0x10000000	/* public export (WebNFS) */

#define __MNT_EXPORTED_FLAGS \
	{ MNT_EXRDONLY,		1,	"exported read-only" }, \
	{ MNT_EXPORTED,		0,	"NFS exported" }, \
	{ MNT_DEFEXPORTED,	1,	"exported to the world" }, \
	{ MNT_EXPORTANON,	1,	"anon uid mapping" }, \
	{ MNT_EXKERB,		1,	"kerberos uid mapping" }, \
	{ MNT_EXNORESPORT,	0,	"non-reserved ports" }, \
	{ MNT_EXPUBLIC,		0,	"WebNFS exports" },

/*
 * Flags set by internal operations.
 */
#define	MNT_LOCAL	0x00001000	/* filesystem is stored locally */
#define	MNT_QUOTA	0x00002000	/* quotas are enabled on filesystem */
#define	MNT_ROOTFS	0x00004000	/* identifies the root filesystem */

#define __MNT_INTERNAL_FLAGS \
	{ MNT_LOCAL,		0,	"local" }, \
	{ MNT_QUOTA,		0,	"with quotas" }, \
	{ MNT_ROOTFS,		1,	"root file system" },

/*
 * Mask of flags that are visible to statvfs()
 */
#define	MNT_VISFLAGMASK	( \
     MNT_RDONLY | \
     MNT_SYNCHRONOUS | \
     MNT_NOEXEC | \
     MNT_NOSUID | \
     MNT_NODEV | \
     MNT_UNION | \
     MNT_ASYNC | \
     MNT_NOCOREDUMP | \
     MNT_IGNORE | \
     MNT_MAGICLINKS | \
     MNT_NOATIME | \
     MNT_SYMPERM | \
     MNT_NODEVMTIME | \
     MNT_SOFTDEP | \
     MNT_EXRDONLY | \
     MNT_EXPORTED | \
     MNT_DEFEXPORTED | \
     MNT_EXPORTANON | \
     MNT_EXKERB | \
     MNT_EXNORESPORT | \
     MNT_EXPUBLIC | \
     MNT_LOCAL | \
     MNT_QUOTA | \
     MNT_ROOTFS)

/*
 * External filesystem control flags.
 */
#define	MNT_UPDATE	0x00010000	/* not a real mount, just an update */
#define	MNT_RELOAD	0x00040000	/* reload filesystem data */
#define	MNT_FORCE	0x00080000	/* force unmount or readonly change */
#define	MNT_GETARGS	0x00400000	/* retrieve file system specific args */

#define __MNT_EXTERNAL_FLAGS \
	{ MNT_UPDATE,		1,	"being updated" }, \
	{ MNT_RELOAD,		1,	"reload filesystem data" }, \
	{ MNT_FORCE,		1,	"force unmount or readonly change" }, \
	{ MNT_GETARGS,		1,	"retrieve mount arguments" },

/*
 * Internal filesystem control flags.
 * These are set in struct mount mnt_iflag.
 *
 * IMNT_UNMOUNT locks the mount entry so that name lookup cannot proceed
 * past the mount point.  This keeps the subtree stable during mounts
 * and unmounts.
 */
#define	IMNT_GONE	0x00000001	/* filesystem is gone.. */
#define	IMNT_UNMOUNT	0x00000002	/* unmount in progress */
#define	IMNT_WANTRDWR	0x00000004	/* upgrade to read/write requested */
#define	IMNT_SUSPEND	0x00000008	/* request upper write suspension */
#define	IMNT_SUSPENDLOW	0x00000010	/* request lower write suspension */
#define	IMNT_SUSPENDED	0x00000020	/* write operations are suspended */
#define	IMNT_DTYPE	0x00000040	/* returns d_type fields */

#define __MNT_FLAGS \
	__MNT_BASIC_FLAGS \
	__MNT_EXPORTED_FLAGS \
	__MNT_INTERNAL_FLAGS \
	__MNT_EXTERNAL_FLAGS

#define __MNT_FLAG_BITS \
	"\20" \
	"\40MNT_SOFTDEP" \
	"\37MNT_NODEVMTIME" \
	"\36MNT_SYMPERM" \
	"\35MNT_EXPUBLIC" \
	"\34MNT_EXNORESPORT" \
	"\33MNT_NOATIME" \
	"\32MNT_UNUSED6" \
	"\31MNT_UNUSED5" \
	"\30MNT_MAGICLINKS" \
	"\27MNT_GETARGS" \
	"\26MNT_UNUSED4" \
	"\25MNT_IGNORE" \
	"\24MNT_FORCE" \
	"\23MNT_RELOAD" \
	"\22MNT_DELEXPORT" \
	"\21MNT_UPDATE" \
	"\20MNT_NOCOREDUMP" \
	"\17MNT_ROOTFS" \
	"\16MNT_QUOTA" \
	"\15MNT_LOCAL" \
	"\14MNT_EXKERB" \
	"\13MNT_EXPORTANON" \
	"\12MNT_DEFEXPORTED" \
	"\11MNT_EXPORTED" \
	"\10MNT_EXRDONLY" \
	"\07MNT_ASYNC" \
	"\06MNT_UNION" \
	"\05MNT_NODEV" \
	"\04MNT_NOSUID" \
	"\03MNT_NOEXEC" \
	"\02MNT_SYNCHRONOUS" \
	"\01MNT_RDONLY"

#define __IMNT_FLAG_BITS \
	"\20" \
	"\07IMNT_DTYPE" \
	"\06IMNT_SUSPENDED" \
	"\05IMNT_SUSPENDLOW" \
	"\04IMNT_SUSPEND" \
	"\03IMNT_WANTRDWR" \
	"\02IMNT_UNMOUNT" \
	"\01IMNT_GONE"

/*
 * Flags for various system call interfaces.
 *
 * waitfor flags to vfs_sync() and getvfsstat()
 */
#define MNT_WAIT	1	/* synchronously wait for I/O to complete */
#define MNT_NOWAIT	2	/* start all I/O, but do not wait for it */
#define MNT_LAZY 	3	/* push data not written by filesystem syncer */
#endif /* _SYS_FSTYPES_H_ */