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Snapshot of work in progress on a modernised disk quota system:
- new quotactl syscall (versionned for backward compat), which takes
  as parameter a path to a mount point, and a prop_dictionary
  (in plistref format) describing commands and arguments.
  For each command, status and data are returned as a prop_dictionary.
  quota commands features will be added to take advantage of this,
  exporting quota data or getting quota commands as plists.

- new on disk-format storage (all 64bit wide), integrated to metadata for
  ffs (and playing nicely with wapbl).
  Quotas are enabled on a ffs filesystem via superblock flags.
  tunefs(8) can enable or disable quotas.
  On a quota-enabled filesystem, fsck_ffs(8) will track per-uid/gid
  block and inode usages, and will check and update quotas in Pass 6.
  quota usage and limits are stored in unliked files (one for users,
  one for groups)l fsck_ffs(8) will create the files if needed, or
  free them if needed. This means that after enabling or disabling
  quotas on a filesystem; a fsck_ffs(8) run is required.
  quotacheck(8) is not needed any more, on a unclean shutdown
  fsck or journal replay will take care of fixing quotas.
  newfs(8) can create a ready-to-mount quota-enabled filesystem
  (superblock flags are set and quota inodes are created).
  Other new features or semantic changes:
  - default quota datas, applied to users or groups which don't already
    have a quota entry
  - per-user/group grace time (instead of a filesystem global one)
  - 0 really means "nothing allowed at all", not "no limit".
    If you want "no limit", set the limit to UQUAD_MAX (tools will
    understand "unlimited" and "-")

  A quota file is structured as follow:
  it starts with a header, containing a few per-filesystem values,
  and the default quota limits.
  Quota entries are linked together as a simple list, each entry has a
  pointer (as an offset withing the file) to the next.
  The header has a pointer to a list of free quota entries, and
  a hash table of in-use entries. The size of the hash table depends
  on the filesystem block size (header+hash table should fit in the
  first block). The file is not sparse and is a multiple of
  filesystem block size (when the free quota entry list is empty a new
  filesystem block is allocated). quota entries to not cross
  filesystem block boundaries.

  In memory, the kernel keeps a cache of recently used quota entries
  as a reference to the block number, and offset withing the block.
  The quota entry itself is keept in the buf cache.

fsck_ffs(8), tunefs(8) and newfs(8) supports are completed (with
related atf tests :)
The kernel can update disk usage and report it via quotactl(2).

Todo: enforce quotas limits (limits are not checked by kernel yet)
      update repquota, edquota and rpc.rquotad to the new world
      implement compat_50_quotactl ioctl.
      update quotactl(2) man page

fsck_ffs required fixes so that allocating new blocks or inodes will
properly update the superblock and cg sumaries. This was not an issue up
to now because superblock and cg sumaries check happened last, but now
allocations or frees can happen in pass 6.

/*	$NetBSD: mount.h,v 1.196.4.1 2011/01/20 14:25:01 bouyer 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_MOUNT_H_
#define _SYS_MOUNT_H_

#ifndef _KERNEL
#include <sys/featuretest.h>
#if defined(_NETBSD_SOURCE)
#include <sys/stat.h>
#endif /* _NETBSD_SOURCE */
#endif

#ifndef _STANDALONE
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/ucred.h>
#include <sys/fstypes.h>
#include <sys/queue.h>
#include <sys/rwlock.h>
#include <sys/statvfs.h>
#include <sys/specificdata.h>
#include <sys/condvar.h>
#endif	/* !_STANDALONE */

/*
 * file system statistics
 */

#define	MNAMELEN	90	/* length of buffer for returned name */

/*
 * File system types.
 */
#define	MOUNT_FFS	"ffs"		/* UNIX "Fast" Filesystem */
#define	MOUNT_UFS	MOUNT_FFS	/* for compatibility */
#define	MOUNT_NFS	"nfs"		/* Network Filesystem */
#define	MOUNT_MFS	"mfs"		/* Memory Filesystem */
#define	MOUNT_MSDOS	"msdos"		/* MSDOS Filesystem */
#define	MOUNT_LFS	"lfs"		/* Log-based Filesystem */
#define	MOUNT_FDESC	"fdesc"		/* File Descriptor Filesystem */
#define	MOUNT_NULL	"null"		/* Minimal Filesystem Layer */
#define	MOUNT_OVERLAY	"overlay"	/* Minimal Overlay Filesystem Layer */
#define	MOUNT_UMAP	"umap"	/* User/Group Identifier Remapping Filesystem */
#define	MOUNT_KERNFS	"kernfs"	/* Kernel Information Filesystem */
#define	MOUNT_PROCFS	"procfs"	/* /proc Filesystem */
#define	MOUNT_AFS	"afs"		/* Andrew Filesystem */
#define	MOUNT_CD9660	"cd9660"	/* ISO9660 (aka CDROM) Filesystem */
#define	MOUNT_UNION	"union"		/* Union (translucent) Filesystem */
#define	MOUNT_ADOSFS	"adosfs"	/* AmigaDOS Filesystem */
#define	MOUNT_EXT2FS	"ext2fs"	/* Second Extended Filesystem */
#define	MOUNT_CFS	"coda"		/* Coda Filesystem */
#define	MOUNT_CODA	MOUNT_CFS	/* Coda Filesystem */
#define	MOUNT_FILECORE	"filecore"	/* Acorn Filecore Filesystem */
#define	MOUNT_NTFS	"ntfs"		/* Windows/NT Filesystem */
#define	MOUNT_SMBFS	"smbfs"		/* CIFS (SMB) */
#define	MOUNT_PTYFS	"ptyfs"		/* Pseudo tty filesystem */
#define	MOUNT_TMPFS	"tmpfs"		/* Efficient memory file-system */
#define MOUNT_UDF	"udf"		/* UDF CD/DVD filesystem */
#define	MOUNT_SYSVBFS	"sysvbfs"	/* System V Boot Filesystem */
#define MOUNT_PUFFS	"puffs"		/* Pass-to-Userspace filesystem */
#define MOUNT_HFS	"hfs"		/* Apple HFS+ Filesystem */
#define MOUNT_EFS	"efs"		/* SGI's Extent Filesystem */
#define MOUNT_ZFS	"zfs"		/* Sun ZFS */
#define MOUNT_NILFS	"nilfs"		/* NTT's NiLFS(2) logging file system */
#define MOUNT_RUMPFS	"rumpfs"	/* rump virtual file system */

#ifndef _STANDALONE

struct vnode;

/*
 * 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 doubly linked list.
 */
struct mount {
	CIRCLEQ_ENTRY(mount) mnt_list;		/* mount list */
	TAILQ_HEAD(, vnode) mnt_vnodelist;	/* list of vnodes this mount */
	struct vfsops	*mnt_op;		/* operations on fs */
	struct vnode	*mnt_vnodecovered;	/* vnode we mounted on */
	struct vnode	*mnt_syncer;		/* syncer vnode */
	void		*mnt_transinfo;		/* for FS-internal use */
	void		*mnt_data;		/* private data */
	krwlock_t	mnt_unmounting;		/* to prevent new activity */
	kmutex_t	mnt_renamelock;		/* per-fs rename lock */
	int		mnt_refcnt;		/* ref count on this structure */
	int		mnt_recursecnt;		/* count of write locks */
	int		mnt_flag;		/* flags */
	int		mnt_iflag;		/* internal flags */
	int		mnt_fs_bshift;		/* offset shift for lblkno */
	int		mnt_dev_bshift;		/* shift for device sectors */
	struct statvfs	mnt_stat;		/* cache of filesystem stats */
	specificdata_reference
			mnt_specdataref;	/* subsystem specific data */
	kmutex_t	mnt_updating;		/* to serialize updates */
	struct wapbl_ops
			*mnt_wapbl_op;		/* logging ops */
	struct wapbl	*mnt_wapbl;		/* log info */
	struct wapbl_replay
			*mnt_wapbl_replay;	/* replay support XXX: what? */
	uint64_t	mnt_gen;
};

/*
 * Sysctl CTL_VFS definitions.
 *
 * Second level identifier specifies which filesystem. Second level
 * identifier VFS_GENERIC returns information about all filesystems.
 *
 * Note the slightly non-flat nature of these sysctl numbers.  Oh for
 * a better sysctl interface.
 */
#define VFS_GENERIC	0		/* generic filesystem information */
#define VFS_MAXTYPENUM	1		/* int: highest defined fs type */
#define VFS_CONF	2		/* struct: vfsconf for filesystem given
					   as next argument */
#define VFS_USERMOUNT	3		/* enable/disable fs mnt by non-root */
#define	VFS_MAGICLINKS  4		/* expand 'magic' symlinks */
#define	VFSGEN_MAXID	5		/* number of valid vfs.generic ids */

/*
 * USE THE SAME NAMES AS MOUNT_*!
 *
 * Only need to add new entry here if the filesystem actually supports
 * sysctl(2).
 */
#define	CTL_VFS_NAMES { \
	{ "generic", CTLTYPE_NODE }, \
	{ MOUNT_FFS, CTLTYPE_NODE }, \
	{ MOUNT_NFS, CTLTYPE_NODE }, \
	{ MOUNT_MFS, CTLTYPE_NODE }, \
	{ MOUNT_MSDOS, CTLTYPE_NODE }, \
	{ MOUNT_LFS, CTLTYPE_NODE }, \
	{ 0, 0 }, 			/* MOUNT_LOFS */ \
	{ MOUNT_FDESC, CTLTYPE_NODE }, \
	{ MOUNT_NULL, CTLTYPE_NODE }, \
	{ MOUNT_UMAP, CTLTYPE_NODE }, \
	{ MOUNT_KERNFS, CTLTYPE_NODE }, \
	{ MOUNT_PROCFS, CTLTYPE_NODE }, \
	{ MOUNT_AFS, CTLTYPE_NODE }, \
	{ MOUNT_CD9660, CTLTYPE_NODE }, \
	{ MOUNT_UNION, CTLTYPE_NODE }, \
	{ MOUNT_ADOSFS, CTLTYPE_NODE }, \
	{ MOUNT_EXT2FS, CTLTYPE_NODE }, \
	{ MOUNT_CODA, CTLTYPE_NODE }, \
	{ MOUNT_FILECORE, CTLTYPE_NODE }, \
	{ MOUNT_NTFS, CTLTYPE_NODE }, \
}

#define	VFS_MAXID	20		/* number of valid vfs ids */

#define	CTL_VFSGENCTL_NAMES { \
	{ 0, 0 }, \
	{ "maxtypenum", CTLTYPE_INT }, \
	{ "conf", CTLTYPE_NODE }, 	/* Special */ \
	{ "usermount", CTLTYPE_INT }, \
	{ "magiclinks", CTLTYPE_INT }, \
}

#if defined(_KERNEL)
#include <prop/proplib.h>
#if __STDC__
struct nameidata;
#endif

/*
 * Operations supported on mounted file system.
 */

struct vfsops {
	const char *vfs_name;
	size_t	vfs_min_mount_data;
	int	(*vfs_mount)	(struct mount *, const char *, void *,
				    size_t *);
	int	(*vfs_start)	(struct mount *, int);
	int	(*vfs_unmount)	(struct mount *, int);
	int	(*vfs_root)	(struct mount *, struct vnode **);
	int	(*vfs_quotactl)	(struct mount *, prop_dictionary_t);
	int	(*vfs_statvfs)	(struct mount *, struct statvfs *);
	int	(*vfs_sync)	(struct mount *, int, struct kauth_cred *);
	int	(*vfs_vget)	(struct mount *, ino_t, struct vnode **);
	int	(*vfs_fhtovp)	(struct mount *, struct fid *,
				    struct vnode **);
	int	(*vfs_vptofh)	(struct vnode *, struct fid *, size_t *);
	void	(*vfs_init)	(void);
	void	(*vfs_reinit)	(void);
	void	(*vfs_done)	(void);
	int	(*vfs_mountroot)(void);
	int	(*vfs_snapshot)	(struct mount *, struct vnode *,
				    struct timespec *);
	int	(*vfs_extattrctl) (struct mount *, int,
				    struct vnode *, int, const char *);
	int	(*vfs_suspendctl) (struct mount *, int);
	int	(*vfs_renamelock_enter)(struct mount *);
	void	(*vfs_renamelock_exit)(struct mount *);
	int	(*vfs_fsync)	(struct vnode *, int);
	const struct vnodeopv_desc * const *vfs_opv_descs;
	int	vfs_refcount;
	LIST_ENTRY(vfsops) vfs_list;
};

/* XXX vget is actually file system internal. */
#define VFS_VGET(MP, INO, VPP)    (*(MP)->mnt_op->vfs_vget)(MP, INO, VPP)

#define VFS_RENAMELOCK_ENTER(MP)  (*(MP)->mnt_op->vfs_renamelock_enter)(MP)
#define VFS_RENAMELOCK_EXIT(MP)   (*(MP)->mnt_op->vfs_renamelock_exit)(MP)
#define VFS_FSYNC(MP, VP, FLG)	  (*(MP)->mnt_op->vfs_fsync)(VP, FLG)

int	VFS_MOUNT(struct mount *, const char *, void *, size_t *);
int	VFS_START(struct mount *, int);
int	VFS_UNMOUNT(struct mount *, int);
int	VFS_ROOT(struct mount *, struct vnode **);
int	VFS_QUOTACTL(struct mount *, prop_dictionary_t);
int	VFS_STATVFS(struct mount *, struct statvfs *);
int	VFS_SYNC(struct mount *, int, struct kauth_cred *);
int	VFS_FHTOVP(struct mount *, struct fid *, struct vnode **);
int	VFS_VPTOFH(struct vnode *, struct fid *, size_t *);
int	VFS_SNAPSHOT(struct mount *, struct vnode *, struct timespec *);
int	VFS_EXTATTRCTL(struct mount *, int, struct vnode *, int, const char *);
int	VFS_SUSPENDCTL(struct mount *, int);

#endif /* _KERNEL */

#ifdef _KERNEL
#if __STDC__
struct mbuf;
struct vnodeopv_desc;
struct kauth_cred;
#endif

#define	VFS_MAX_MOUNT_DATA	8192

#define VFS_PROTOS(fsname)						\
int	fsname##_mount(struct mount *, const char *, void *,		\
		size_t *);						\
int	fsname##_start(struct mount *, int);				\
int	fsname##_unmount(struct mount *, int);				\
int	fsname##_root(struct mount *, struct vnode **);			\
int	fsname##_quotactl(struct mount *, prop_dictionary_t);		\
int	fsname##_statvfs(struct mount *, struct statvfs *);		\
int	fsname##_sync(struct mount *, int, struct kauth_cred *);	\
int	fsname##_vget(struct mount *, ino_t, struct vnode **);		\
int	fsname##_fhtovp(struct mount *, struct fid *, struct vnode **);	\
int	fsname##_vptofh(struct vnode *, struct fid *, size_t *);	\
void	fsname##_init(void);						\
void	fsname##_reinit(void);						\
void	fsname##_done(void);						\
int	fsname##_mountroot(void);					\
int	fsname##_snapshot(struct mount *, struct vnode *,		\
		struct timespec *);					\
int	fsname##_extattrctl(struct mount *, int, struct vnode *, int,	\
		const char *);						\
int	fsname##_suspendctl(struct mount *, int)

/*
 * This operations vector is so wapbl can be wrapped into a filesystem lkm.
 * XXX Eventually, we want to move this functionality
 * down into the filesystems themselves so that this isn't needed.
 */
struct wapbl_ops {
	void (*wo_wapbl_discard)(struct wapbl *);
	int (*wo_wapbl_replay_isopen)(struct wapbl_replay *);
	int (*wo_wapbl_replay_can_read)(struct wapbl_replay *, daddr_t, long);
	int (*wo_wapbl_replay_read)(struct wapbl_replay *, void *, daddr_t, long);
	void (*wo_wapbl_add_buf)(struct wapbl *, struct buf *);
	void (*wo_wapbl_remove_buf)(struct wapbl *, struct buf *);
	void (*wo_wapbl_resize_buf)(struct wapbl *, struct buf *, long, long);
	int (*wo_wapbl_begin)(struct wapbl *, const char *, int);
	void (*wo_wapbl_end)(struct wapbl *);
	void (*wo_wapbl_junlock_assert)(struct wapbl *);
	void (*wo_wapbl_biodone)(struct buf *);
};
#define WAPBL_DISCARD(MP)						\
    (*(MP)->mnt_wapbl_op->wo_wapbl_discard)((MP)->mnt_wapbl)
#define WAPBL_REPLAY_ISOPEN(MP)						\
    (*(MP)->mnt_wapbl_op->wo_wapbl_replay_isopen)((MP)->mnt_wapbl_replay)
#define WAPBL_REPLAY_CAN_READ(MP, BLK, LEN)				\
    (*(MP)->mnt_wapbl_op->wo_wapbl_replay_can_read)((MP)->mnt_wapbl_replay, \
    (BLK), (LEN))
#define WAPBL_REPLAY_READ(MP, DATA, BLK, LEN)				\
    (*(MP)->mnt_wapbl_op->wo_wapbl_replay_read)((MP)->mnt_wapbl_replay,	\
    (DATA), (BLK), (LEN))
#define WAPBL_ADD_BUF(MP, BP)						\
    (*(MP)->mnt_wapbl_op->wo_wapbl_add_buf)((MP)->mnt_wapbl, (BP))
#define WAPBL_REMOVE_BUF(MP, BP)					\
    (*(MP)->mnt_wapbl_op->wo_wapbl_remove_buf)((MP)->mnt_wapbl, (BP))
#define WAPBL_RESIZE_BUF(MP, BP, OLDSZ, OLDCNT)				\
    (*(MP)->mnt_wapbl_op->wo_wapbl_resize_buf)((MP)->mnt_wapbl, (BP),	\
    (OLDSZ), (OLDCNT))
#define WAPBL_BEGIN(MP)							\
    (*(MP)->mnt_wapbl_op->wo_wapbl_begin)((MP)->mnt_wapbl,		\
    __FILE__, __LINE__)
#define WAPBL_END(MP)							\
    (*(MP)->mnt_wapbl_op->wo_wapbl_end)((MP)->mnt_wapbl)
#define WAPBL_JUNLOCK_ASSERT(MP)					\
    (*(MP)->mnt_wapbl_op->wo_wapbl_junlock_assert)((MP)->mnt_wapbl)

struct vfs_hooks {
	LIST_ENTRY(vfs_hooks) vfs_hooks_list;
	void	(*vh_unmount)(struct mount *);
	int	(*vh_reexport)(struct mount *, const char *, void *);
	void	(*vh_future_expansion_1)(void);
	void	(*vh_future_expansion_2)(void);
	void	(*vh_future_expansion_3)(void);
	void	(*vh_future_expansion_4)(void);
	void	(*vh_future_expansion_5)(void);
};

void	vfs_hooks_init(void);
int	vfs_hooks_attach(struct vfs_hooks *);
int	vfs_hooks_detach(struct vfs_hooks *);
void	vfs_hooks_unmount(struct mount *);
int	vfs_hooks_reexport(struct mount *, const char *, void *);

#endif /* _KERNEL */

/*
 * Export arguments for local filesystem mount calls.
 *
 * This structure is deprecated and is only provided for compatibility
 * reasons with old binary utilities; several file systems expose an
 * instance of this structure in their mount arguments structure, thus
 * needing a padding in place of the old values.  This definition cannot
 * change in the future due to this reason.
 * XXX: This should be moved to the compat subtree but cannot be done
 * until we can move the mount args structures themselves.
 *
 * The current export_args structure can be found in nfs/nfs.h.
 */
struct export_args30 {
	int	ex_flags;		/* export related flags */
	uid_t	ex_root;		/* mapping for root uid */
	struct	uucred ex_anon;		/* mapping for anonymous user */
	struct	sockaddr *ex_addr;	/* net address to which exported */
	int	ex_addrlen;		/* and the net address length */
	struct	sockaddr *ex_mask;	/* mask of valid bits in saddr */
	int	ex_masklen;		/* and the smask length */
	char	*ex_indexfile;		/* index file for WebNFS URLs */
};

struct mnt_export_args30 {
	const char *fspec;		/* Always NULL */
	struct export_args30 eargs;
};

#ifdef _KERNEL
#include <sys/mallocvar.h>
MALLOC_DECLARE(M_MOUNT);

/*
 * exported VFS interface (see vfssubr(9))
 */
struct	mount *vfs_getvfs(fsid_t *);    /* return vfs given fsid */
int	vfs_composefh(struct vnode *, fhandle_t *, size_t *);
int	vfs_composefh_alloc(struct vnode *, fhandle_t **);
void	vfs_composefh_free(fhandle_t *);
int	vfs_fhtovp(fhandle_t *, struct vnode **);
int	vfs_mountedon(struct vnode *);/* is a vfs mounted on vp */
int	vfs_mountroot(void);
void	vfs_shutdown(void);	    /* unmount and sync file systems */
void	vfs_sync_all(struct lwp *);
bool	vfs_unmountall(struct lwp *);	    /* unmount file systems */
bool	vfs_unmountall1(struct lwp *, bool, bool);
bool	vfs_unmount_forceone(struct lwp *);
int 	vfs_busy(struct mount *, struct mount **);
int	vfs_rootmountalloc(const char *, const char *, struct mount **);
void	vfs_unbusy(struct mount *, bool, struct mount **);
int	vfs_attach(struct vfsops *);
int	vfs_detach(struct vfsops *);
void	vfs_reinit(void);
struct vfsops *vfs_getopsbyname(const char *);
void	vfs_delref(struct vfsops *);
void	vfs_destroy(struct mount *);
void	vfs_scrubvnlist(struct mount *);
struct mount *vfs_mountalloc(struct vfsops *, struct vnode *);
int	vfs_stdextattrctl(struct mount *, int, struct vnode *,
	    int, const char *);

extern	CIRCLEQ_HEAD(mntlist, mount) mountlist;	/* mounted filesystem list */
extern	struct vfsops *vfssw[];			/* filesystem type table */
extern	int nvfssw;
extern  kmutex_t mountlist_lock;
extern	kmutex_t vfs_list_lock;

long	makefstype(const char *);
int	dounmount(struct mount *, int, struct lwp *);
int	do_sys_mount(struct lwp *, struct vfsops *, const char *, const char *,
	    int, void *, enum uio_seg, size_t, register_t *);
void	vfsinit(void);
void	vfs_opv_init(const struct vnodeopv_desc * const *);
void	vfs_opv_free(const struct vnodeopv_desc * const *);
#ifdef DEBUG
void	vfs_bufstats(void);
#endif

int	mount_specific_key_create(specificdata_key_t *, specificdata_dtor_t);
void	mount_specific_key_delete(specificdata_key_t);
void 	mount_initspecific(struct mount *);
void 	mount_finispecific(struct mount *);
void *	mount_getspecific(struct mount *, specificdata_key_t);
void	mount_setspecific(struct mount *, specificdata_key_t, void *);

int	usermount_common_policy(struct mount *, u_long);

LIST_HEAD(vfs_list_head, vfsops);
extern struct vfs_list_head vfs_list;

#else /* _KERNEL */

#include <sys/cdefs.h>

__BEGIN_DECLS
#if !defined(__LIBC12_SOURCE__) && !defined(_STANDALONE)
int	getfh(const char *, void *, size_t *)
	__RENAME(__getfh30);
#endif

int	unmount(const char *, int);
#if defined(_NETBSD_SOURCE)
#ifndef __LIBC12_SOURCE__
int mount(const char *, const char *, int, void *, size_t) __RENAME(__mount50);
int	fhopen(const void *, size_t, int) __RENAME(__fhopen40);
int	fhstat(const void *, size_t, struct stat *) __RENAME(__fhstat50);
#endif
#endif /* _NETBSD_SOURCE */
__END_DECLS

#endif /* _KERNEL */
#endif /* !_STANDALONE */

#endif /* !_SYS_MOUNT_H_ */