xref: /freebsd/sys/sys/mount.h (revision 716fd348)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1989, 1991, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	@(#)mount.h	8.21 (Berkeley) 5/20/95
32  * $FreeBSD$
33  */
34 
35 #ifndef _SYS_MOUNT_H_
36 #define _SYS_MOUNT_H_
37 
38 #include <sys/ucred.h>
39 #include <sys/queue.h>
40 #ifdef _KERNEL
41 #include <sys/types.h>
42 #include <sys/lock.h>
43 #include <sys/lockmgr.h>
44 #include <sys/tslog.h>
45 #include <sys/_mutex.h>
46 #include <sys/_sx.h>
47 #endif
48 
49 /*
50  * NOTE: When changing statfs structure, mount structure, MNT_* flags or
51  * MNTK_* flags also update DDB show mount command in vfs_subr.c.
52  */
53 
54 typedef struct fsid { int32_t val[2]; } fsid_t;	/* filesystem id type */
55 
56 #define fsidcmp(a, b) memcmp((a), (b), sizeof(fsid_t))
57 
58 /*
59  * File identifier.
60  * These are unique per filesystem on a single machine.
61  *
62  * Note that the offset of fid_data is 4 bytes, so care must be taken to avoid
63  * undefined behavior accessing unaligned fields within an embedded struct.
64  */
65 #define	MAXFIDSZ	16
66 
67 struct fid {
68 	u_short		fid_len;		/* length of data in bytes */
69 	u_short		fid_data0;		/* force longword alignment */
70 	char		fid_data[MAXFIDSZ];	/* data (variable length) */
71 };
72 
73 /*
74  * filesystem statistics
75  */
76 #define	MFSNAMELEN	16		/* length of type name including null */
77 #define	MNAMELEN	1024		/* size of on/from name bufs */
78 #define	STATFS_VERSION	0x20140518	/* current version number */
79 struct statfs {
80 	uint32_t f_version;		/* structure version number */
81 	uint32_t f_type;		/* type of filesystem */
82 	uint64_t f_flags;		/* copy of mount exported flags */
83 	uint64_t f_bsize;		/* filesystem fragment size */
84 	uint64_t f_iosize;		/* optimal transfer block size */
85 	uint64_t f_blocks;		/* total data blocks in filesystem */
86 	uint64_t f_bfree;		/* free blocks in filesystem */
87 	int64_t	 f_bavail;		/* free blocks avail to non-superuser */
88 	uint64_t f_files;		/* total file nodes in filesystem */
89 	int64_t	 f_ffree;		/* free nodes avail to non-superuser */
90 	uint64_t f_syncwrites;		/* count of sync writes since mount */
91 	uint64_t f_asyncwrites;		/* count of async writes since mount */
92 	uint64_t f_syncreads;		/* count of sync reads since mount */
93 	uint64_t f_asyncreads;		/* count of async reads since mount */
94 	uint64_t f_spare[10];		/* unused spare */
95 	uint32_t f_namemax;		/* maximum filename length */
96 	uid_t	  f_owner;		/* user that mounted the filesystem */
97 	fsid_t	  f_fsid;		/* filesystem id */
98 	char	  f_charspare[80];	    /* spare string space */
99 	char	  f_fstypename[MFSNAMELEN]; /* filesystem type name */
100 	char	  f_mntfromname[MNAMELEN];  /* mounted filesystem */
101 	char	  f_mntonname[MNAMELEN];    /* directory on which mounted */
102 };
103 
104 #if defined(_WANT_FREEBSD11_STATFS) || defined(_KERNEL)
105 #define	FREEBSD11_STATFS_VERSION	0x20030518 /* current version number */
106 struct freebsd11_statfs {
107 	uint32_t f_version;		/* structure version number */
108 	uint32_t f_type;		/* type of filesystem */
109 	uint64_t f_flags;		/* copy of mount exported flags */
110 	uint64_t f_bsize;		/* filesystem fragment size */
111 	uint64_t f_iosize;		/* optimal transfer block size */
112 	uint64_t f_blocks;		/* total data blocks in filesystem */
113 	uint64_t f_bfree;		/* free blocks in filesystem */
114 	int64_t	 f_bavail;		/* free blocks avail to non-superuser */
115 	uint64_t f_files;		/* total file nodes in filesystem */
116 	int64_t	 f_ffree;		/* free nodes avail to non-superuser */
117 	uint64_t f_syncwrites;		/* count of sync writes since mount */
118 	uint64_t f_asyncwrites;		/* count of async writes since mount */
119 	uint64_t f_syncreads;		/* count of sync reads since mount */
120 	uint64_t f_asyncreads;		/* count of async reads since mount */
121 	uint64_t f_spare[10];		/* unused spare */
122 	uint32_t f_namemax;		/* maximum filename length */
123 	uid_t	  f_owner;		/* user that mounted the filesystem */
124 	fsid_t	  f_fsid;		/* filesystem id */
125 	char	  f_charspare[80];	/* spare string space */
126 	char	  f_fstypename[16];	/* filesystem type name */
127 	char	  f_mntfromname[88];	/* mounted filesystem */
128 	char	  f_mntonname[88];	/* directory on which mounted */
129 };
130 #endif /* _WANT_FREEBSD11_STATFS || _KERNEL */
131 
132 #ifdef _KERNEL
133 #define	OMFSNAMELEN	16	/* length of fs type name, including null */
134 #define	OMNAMELEN	(88 - 2 * sizeof(long))	/* size of on/from name bufs */
135 
136 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
137 /* XXX statfs.2 is out of date with read counter changes here. */
138 struct ostatfs {
139 	long	f_spare2;		/* placeholder */
140 	long	f_bsize;		/* fundamental filesystem block size */
141 	long	f_iosize;		/* optimal transfer block size */
142 	long	f_blocks;		/* total data blocks in filesystem */
143 	long	f_bfree;		/* free blocks in fs */
144 	long	f_bavail;		/* free blocks avail to non-superuser */
145 	long	f_files;		/* total file nodes in filesystem */
146 	long	f_ffree;		/* free file nodes in fs */
147 	fsid_t	f_fsid;			/* filesystem id */
148 	uid_t	f_owner;		/* user that mounted the filesystem */
149 	int	f_type;			/* type of filesystem */
150 	int	f_flags;		/* copy of mount exported flags */
151 	long	f_syncwrites;		/* count of sync writes since mount */
152 	long	f_asyncwrites;		/* count of async writes since mount */
153 	char	f_fstypename[OMFSNAMELEN]; /* fs type name */
154 	char	f_mntonname[OMNAMELEN];	/* directory on which mounted */
155 	long	f_syncreads;		/* count of sync reads since mount */
156 	long	f_asyncreads;		/* count of async reads since mount */
157 	short	f_spares1;		/* unused spare */
158 	char	f_mntfromname[OMNAMELEN];/* mounted filesystem */
159 	short	f_spares2;		/* unused spare */
160 	/*
161 	 * XXX on machines where longs are aligned to 8-byte boundaries, there
162 	 * is an unnamed int32_t here.  This spare was after the apparent end
163 	 * of the struct until we bit off the read counters from f_mntonname.
164 	 */
165 	long	f_spare[2];		/* unused spare */
166 };
167 #endif	/* _KERNEL */
168 
169 #if defined(_WANT_MOUNT) || defined(_KERNEL)
170 TAILQ_HEAD(vnodelst, vnode);
171 
172 /* Mount options list */
173 TAILQ_HEAD(vfsoptlist, vfsopt);
174 struct vfsopt {
175 	TAILQ_ENTRY(vfsopt) link;
176 	char	*name;
177 	void	*value;
178 	int	len;
179 	int	pos;
180 	int	seen;
181 };
182 
183 struct mount_pcpu {
184 	int		mntp_thread_in_ops;
185 	int		mntp_ref;
186 	int		mntp_lockref;
187 	int		mntp_writeopcount;
188 };
189 
190 _Static_assert(sizeof(struct mount_pcpu) == 16,
191     "the struct is allocated from pcpu 16 zone");
192 
193 /*
194  * Structure for tracking a stacked filesystem mounted above another
195  * filesystem.  This is expected to be stored in the upper FS' per-mount data.
196  *
197  * Lock reference:
198  *	i - lower mount interlock
199  *	c - constant from node initialization
200  */
201 struct mount_upper_node {
202 	struct mount 	*mp;	/* (c) mount object for upper FS */
203 	TAILQ_ENTRY(mount_upper_node) mnt_upper_link;	/* (i) position in uppers list */
204 };
205 
206 /*
207  * Structure per mounted filesystem.  Each mounted filesystem has an
208  * array of operations and an instance record.  The filesystems are
209  * put on a doubly linked list.
210  *
211  * Lock reference:
212  * 	l - mnt_listmtx
213  *	m - mountlist_mtx
214  *	i - interlock
215  *	v - vnode freelist mutex
216  *	d - deferred unmount list mutex
217  *
218  * Unmarked fields are considered stable as long as a ref is held.
219  *
220  */
221 struct mount {
222 	int 		mnt_vfs_ops;		/* (i) pending vfs ops */
223 	int		mnt_kern_flag;		/* (i) kernel only flags */
224 	uint64_t	mnt_flag;		/* (i) flags shared with user */
225 	struct mount_pcpu *mnt_pcpu;		/* per-CPU data */
226 	struct vnode	*mnt_rootvnode;
227 	struct vnode	*mnt_vnodecovered;	/* vnode we mounted on */
228 	struct vfsops	*mnt_op;		/* operations on fs */
229 	struct vfsconf	*mnt_vfc;		/* configuration info */
230 	struct mtx __aligned(CACHE_LINE_SIZE)	mnt_mtx; /* mount structure interlock */
231 	int		mnt_gen;		/* struct mount generation */
232 #define	mnt_startzero	mnt_list
233 	TAILQ_ENTRY(mount) mnt_list;		/* (m) mount list */
234 	struct vnode	*mnt_syncer;		/* syncer vnode */
235 	int		mnt_ref;		/* (i) Reference count */
236 	struct vnodelst	mnt_nvnodelist;		/* (i) list of vnodes */
237 	int		mnt_nvnodelistsize;	/* (i) # of vnodes */
238 	int		mnt_writeopcount;	/* (i) write syscalls pending */
239 	struct vfsoptlist *mnt_opt;		/* current mount options */
240 	struct vfsoptlist *mnt_optnew;		/* new options passed to fs */
241 	struct statfs	mnt_stat;		/* cache of filesystem stats */
242 	struct ucred	*mnt_cred;		/* credentials of mounter */
243 	void *		mnt_data;		/* private data */
244 	time_t		mnt_time;		/* last time written*/
245 	int		mnt_iosize_max;		/* max size for clusters, etc */
246 	struct netexport *mnt_export;		/* export list */
247 	struct label	*mnt_label;		/* MAC label for the fs */
248 	u_int		mnt_hashseed;		/* Random seed for vfs_hash */
249 	int		mnt_lockref;		/* (i) Lock reference count */
250 	int		mnt_secondary_writes;   /* (i) # of secondary writes */
251 	int		mnt_secondary_accwrites;/* (i) secondary wr. starts */
252 	struct thread	*mnt_susp_owner;	/* (i) thread owning suspension */
253 #define	mnt_endzero	mnt_gjprovider
254 	char		*mnt_gjprovider;	/* gjournal provider name */
255 	struct mtx	mnt_listmtx;
256 	struct vnodelst	mnt_lazyvnodelist;	/* (l) list of lazy vnodes */
257 	int		mnt_lazyvnodelistsize;	/* (l) # of lazy vnodes */
258 	int		mnt_upper_pending;	/* (i) # of pending ops on mnt_uppers */
259 	struct lock	mnt_explock;		/* vfs_export walkers lock */
260 	TAILQ_HEAD(, mount_upper_node) mnt_uppers; /* (i) upper mounts over us */
261 	TAILQ_HEAD(, mount_upper_node) mnt_notify; /* (i) upper mounts for notification */
262 	STAILQ_ENTRY(mount) mnt_taskqueue_link;	/* (d) our place in deferred unmount list */
263 	uint64_t	mnt_taskqueue_flags;	/* (d) unmount flags passed from taskqueue */
264 	unsigned int	mnt_unmount_retries;	/* (d) # of failed deferred unmount attempts */
265 };
266 #endif	/* _WANT_MOUNT || _KERNEL */
267 
268 #ifdef _KERNEL
269 /*
270  * Definitions for MNT_VNODE_FOREACH_ALL.
271  */
272 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
273 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
274 void          __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
275 
276 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp)				\
277 	for (vp = __mnt_vnode_first_all(&(mvp), (mp));			\
278 		(vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
279 
280 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp)				\
281 	do {								\
282 		MNT_ILOCK(mp);						\
283 		__mnt_vnode_markerfree_all(&(mvp), (mp));		\
284 		/* MNT_IUNLOCK(mp); -- done in above function */	\
285 		mtx_assert(MNT_MTX(mp), MA_NOTOWNED);			\
286 	} while (0)
287 
288 /*
289  * Definitions for MNT_VNODE_FOREACH_LAZY.
290  */
291 typedef int mnt_lazy_cb_t(struct vnode *, void *);
292 struct vnode *__mnt_vnode_next_lazy(struct vnode **mvp, struct mount *mp,
293     mnt_lazy_cb_t *cb, void *cbarg);
294 struct vnode *__mnt_vnode_first_lazy(struct vnode **mvp, struct mount *mp,
295     mnt_lazy_cb_t *cb, void *cbarg);
296 void          __mnt_vnode_markerfree_lazy(struct vnode **mvp, struct mount *mp);
297 
298 #define MNT_VNODE_FOREACH_LAZY(vp, mp, mvp, cb, cbarg)			\
299 	for (vp = __mnt_vnode_first_lazy(&(mvp), (mp), (cb), (cbarg));	\
300 		(vp) != NULL; 						\
301 		vp = __mnt_vnode_next_lazy(&(mvp), (mp), (cb), (cbarg)))
302 
303 #define MNT_VNODE_FOREACH_LAZY_ABORT(mp, mvp)				\
304 	__mnt_vnode_markerfree_lazy(&(mvp), (mp))
305 
306 #define	MNT_ILOCK(mp)	mtx_lock(&(mp)->mnt_mtx)
307 #define	MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
308 #define	MNT_IUNLOCK(mp)	mtx_unlock(&(mp)->mnt_mtx)
309 #define	MNT_MTX(mp)	(&(mp)->mnt_mtx)
310 
311 #define	MNT_REF(mp)	do {						\
312 	mtx_assert(MNT_MTX(mp), MA_OWNED);				\
313 	mp->mnt_ref++;							\
314 } while (0)
315 #define	MNT_REL(mp)	do {						\
316 	mtx_assert(MNT_MTX(mp), MA_OWNED);				\
317 	(mp)->mnt_ref--;						\
318 	if ((mp)->mnt_vfs_ops && (mp)->mnt_ref < 0)		\
319 		vfs_dump_mount_counters(mp);				\
320 	if ((mp)->mnt_ref == 0 && (mp)->mnt_vfs_ops)		\
321 		wakeup((mp));						\
322 } while (0)
323 
324 #endif /* _KERNEL */
325 
326 #if defined(_WANT_MNTOPTNAMES) || defined(_KERNEL)
327 struct mntoptnames {
328 	uint64_t o_opt;
329 	const char *o_name;
330 };
331 #define MNTOPT_NAMES							\
332 	{ MNT_ASYNC,		"asynchronous" },			\
333 	{ MNT_EXPORTED,		"NFS exported" },			\
334 	{ MNT_LOCAL,		"local" },				\
335 	{ MNT_NOATIME,		"noatime" },				\
336 	{ MNT_NOEXEC,		"noexec" },				\
337 	{ MNT_NOSUID,		"nosuid" },				\
338 	{ MNT_NOSYMFOLLOW,	"nosymfollow" },			\
339 	{ MNT_QUOTA,		"with quotas" },			\
340 	{ MNT_RDONLY,		"read-only" },				\
341 	{ MNT_SYNCHRONOUS,	"synchronous" },			\
342 	{ MNT_UNION,		"union" },				\
343 	{ MNT_NOCLUSTERR,	"noclusterr" },				\
344 	{ MNT_NOCLUSTERW,	"noclusterw" },				\
345 	{ MNT_SUIDDIR,		"suiddir" },				\
346 	{ MNT_SOFTDEP,		"soft-updates" },			\
347 	{ MNT_SUJ,		"journaled soft-updates" },		\
348 	{ MNT_MULTILABEL,	"multilabel" },				\
349 	{ MNT_ACLS,		"acls" },				\
350 	{ MNT_NFS4ACLS,		"nfsv4acls" },				\
351 	{ MNT_GJOURNAL,		"gjournal" },				\
352 	{ MNT_AUTOMOUNTED,	"automounted" },			\
353 	{ MNT_VERIFIED,		"verified" },				\
354 	{ MNT_UNTRUSTED,	"untrusted" },				\
355 	{ MNT_NOCOVER,		"nocover" },				\
356 	{ MNT_EMPTYDIR,		"emptydir" },				\
357 	{ MNT_UPDATE,		"update" },				\
358 	{ MNT_DELEXPORT,	"delexport" },				\
359 	{ MNT_RELOAD,		"reload" },				\
360 	{ MNT_FORCE,		"force" },				\
361 	{ MNT_SNAPSHOT,		"snapshot" },				\
362 	{ 0, NULL }
363 #endif
364 
365 /*
366  * User specifiable flags, stored in mnt_flag.
367  */
368 #define	MNT_RDONLY	0x0000000000000001ULL /* read only filesystem */
369 #define	MNT_SYNCHRONOUS	0x0000000000000002ULL /* fs written synchronously */
370 #define	MNT_NOEXEC	0x0000000000000004ULL /* can't exec from filesystem */
371 #define	MNT_NOSUID	0x0000000000000008ULL /* don't honor setuid fs bits */
372 #define	MNT_NFS4ACLS	0x0000000000000010ULL /* enable NFS version 4 ACLs */
373 #define	MNT_UNION	0x0000000000000020ULL /* union with underlying fs */
374 #define	MNT_ASYNC	0x0000000000000040ULL /* fs written asynchronously */
375 #define	MNT_SUIDDIR	0x0000000000100000ULL /* special SUID dir handling */
376 #define	MNT_SOFTDEP	0x0000000000200000ULL /* using soft updates */
377 #define	MNT_NOSYMFOLLOW	0x0000000000400000ULL /* do not follow symlinks */
378 #define	MNT_GJOURNAL	0x0000000002000000ULL /* GEOM journal support enabled */
379 #define	MNT_MULTILABEL	0x0000000004000000ULL /* MAC support for objects */
380 #define	MNT_ACLS	0x0000000008000000ULL /* ACL support enabled */
381 #define	MNT_NOATIME	0x0000000010000000ULL /* dont update file access time */
382 #define	MNT_NOCLUSTERR	0x0000000040000000ULL /* disable cluster read */
383 #define	MNT_NOCLUSTERW	0x0000000080000000ULL /* disable cluster write */
384 #define	MNT_SUJ		0x0000000100000000ULL /* using journaled soft updates */
385 #define	MNT_AUTOMOUNTED	0x0000000200000000ULL /* mounted by automountd(8) */
386 #define	MNT_UNTRUSTED	0x0000000800000000ULL /* filesys metadata untrusted */
387 
388 /*
389  * NFS export related mount flags.
390  */
391 #define	MNT_EXRDONLY	0x0000000000000080ULL	/* exported read only */
392 #define	MNT_EXPORTED	0x0000000000000100ULL	/* filesystem is exported */
393 #define	MNT_DEFEXPORTED	0x0000000000000200ULL	/* exported to the world */
394 #define	MNT_EXPORTANON	0x0000000000000400ULL	/* anon uid mapping for all */
395 #define	MNT_EXKERB	0x0000000000000800ULL	/* exported with Kerberos */
396 #define	MNT_EXPUBLIC	0x0000000020000000ULL	/* public export (WebNFS) */
397 #define	MNT_EXTLS	0x0000004000000000ULL /* require TLS */
398 #define	MNT_EXTLSCERT	0x0000008000000000ULL /* require TLS with client cert */
399 #define	MNT_EXTLSCERTUSER 0x0000010000000000ULL /* require TLS with user cert */
400 
401 /*
402  * Flags set by internal operations, but visible to the user.
403  */
404 #define	MNT_LOCAL	0x0000000000001000ULL /* filesystem is stored locally */
405 #define	MNT_QUOTA	0x0000000000002000ULL /* quotas are enabled on fs */
406 #define	MNT_ROOTFS	0x0000000000004000ULL /* identifies the root fs */
407 #define	MNT_USER	0x0000000000008000ULL /* mounted by a user */
408 #define	MNT_IGNORE	0x0000000000800000ULL /* do not show entry in df */
409 #define	MNT_VERIFIED	0x0000000400000000ULL /* filesystem is verified */
410 
411 /*
412  * Mask of flags that are visible to statfs().
413  * XXX I think that this could now become (~(MNT_CMDFLAGS))
414  * but the 'mount' program may need changing to handle this.
415  */
416 #define	MNT_VISFLAGMASK	(MNT_RDONLY	| MNT_SYNCHRONOUS | MNT_NOEXEC	| \
417 			MNT_NOSUID	| MNT_UNION	| MNT_SUJ	| \
418 			MNT_ASYNC	| MNT_EXRDONLY	| MNT_EXPORTED	| \
419 			MNT_DEFEXPORTED	| MNT_EXPORTANON| MNT_EXKERB	| \
420 			MNT_LOCAL	| MNT_USER	| MNT_QUOTA	| \
421 			MNT_ROOTFS	| MNT_NOATIME	| MNT_NOCLUSTERR| \
422 			MNT_NOCLUSTERW	| MNT_SUIDDIR	| MNT_SOFTDEP	| \
423 			MNT_IGNORE	| MNT_EXPUBLIC	| MNT_NOSYMFOLLOW | \
424 			MNT_GJOURNAL	| MNT_MULTILABEL | MNT_ACLS	| \
425 			MNT_NFS4ACLS	| MNT_AUTOMOUNTED | MNT_VERIFIED | \
426 			MNT_UNTRUSTED)
427 
428 /* Mask of flags that can be updated. */
429 #define	MNT_UPDATEMASK (MNT_NOSUID	| MNT_NOEXEC	| \
430 			MNT_SYNCHRONOUS	| MNT_UNION	| MNT_ASYNC	| \
431 			MNT_NOATIME | \
432 			MNT_NOSYMFOLLOW	| MNT_IGNORE	| \
433 			MNT_NOCLUSTERR	| MNT_NOCLUSTERW | MNT_SUIDDIR	| \
434 			MNT_ACLS	| MNT_USER	| MNT_NFS4ACLS	| \
435 			MNT_AUTOMOUNTED | MNT_UNTRUSTED)
436 
437 /*
438  * External filesystem command modifier flags.
439  * Unmount can use the MNT_FORCE flag.
440  * XXX: These are not STATES and really should be somewhere else.
441  * XXX: MNT_BYFSID and MNT_NONBUSY collide with MNT_ACLS and MNT_MULTILABEL,
442  *      but because MNT_ACLS and MNT_MULTILABEL are only used for mount(2),
443  *      and MNT_BYFSID and MNT_NONBUSY are only used for unmount(2),
444  *      it's harmless.
445  */
446 #define	MNT_UPDATE	0x0000000000010000ULL /* not real mount, just update */
447 #define	MNT_DELEXPORT	0x0000000000020000ULL /* delete export host lists */
448 #define	MNT_RELOAD	0x0000000000040000ULL /* reload filesystem data */
449 #define	MNT_FORCE	0x0000000000080000ULL /* force unmount or readonly */
450 #define	MNT_SNAPSHOT	0x0000000001000000ULL /* snapshot the filesystem */
451 #define	MNT_NONBUSY	0x0000000004000000ULL /* check vnode use counts. */
452 #define	MNT_BYFSID	0x0000000008000000ULL /* specify filesystem by ID. */
453 #define	MNT_NOCOVER	0x0000001000000000ULL /* Do not cover a mount point */
454 #define	MNT_EMPTYDIR	0x0000002000000000ULL /* Only mount on empty dir */
455 #define	MNT_RECURSE	0x0000100000000000ULL /* recursively unmount uppers */
456 #define	MNT_DEFERRED    0x0000200000000000ULL /* unmount in async context */
457 #define	MNT_CMDFLAGS   (MNT_UPDATE	| MNT_DELEXPORT	| MNT_RELOAD	| \
458 			MNT_FORCE	| MNT_SNAPSHOT	| MNT_NONBUSY	| \
459 			MNT_BYFSID	| MNT_NOCOVER	| MNT_EMPTYDIR	| \
460 			MNT_RECURSE	| MNT_DEFERRED)
461 
462 /*
463  * Internal filesystem control flags stored in mnt_kern_flag.
464  *
465  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot
466  * proceed past the mount point.  This keeps the subtree stable during
467  * mounts and unmounts.  When non-forced unmount flushes all vnodes
468  * from the mp queue, the MNTK_UNMOUNT flag prevents insmntque() from
469  * queueing new vnodes.
470  *
471  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
472  * dounmount() is still waiting to lock the mountpoint. This allows
473  * the filesystem to cancel operations that might otherwise deadlock
474  * with the unmount attempt (used by NFS).
475  */
476 #define MNTK_UNMOUNTF	0x00000001	/* forced unmount in progress */
477 #define MNTK_ASYNC	0x00000002	/* filtered async flag */
478 #define MNTK_SOFTDEP	0x00000004	/* async disabled by softdep */
479 #define MNTK_NOMSYNC	0x00000008	/* don't do msync */
480 #define	MNTK_DRAINING	0x00000010	/* lock draining is happening */
481 #define	MNTK_REFEXPIRE	0x00000020	/* refcount expiring is happening */
482 #define MNTK_EXTENDED_SHARED	0x00000040 /* Allow shared locking for more ops */
483 #define	MNTK_SHARED_WRITES	0x00000080 /* Allow shared locking for writes */
484 #define	MNTK_NO_IOPF	0x00000100	/* Disallow page faults during reads
485 					   and writes. Filesystem shall properly
486 					   handle i/o state on EFAULT. */
487 #define	MNTK_RECURSE		0x00000200 /* pending recursive unmount */
488 #define	MNTK_UPPER_WAITER	0x00000400 /* waiting to drain MNTK_UPPER_PENDING */
489 /* UNUSED 			0x00000800 */
490 #define	MNTK_UNLOCKED_INSMNTQUE	0x00001000 /* fs does not lock the vnode for insmntque */
491 #define	MNTK_UNMAPPED_BUFS	0x00002000
492 #define	MNTK_USES_BCACHE	0x00004000 /* FS uses the buffer cache. */
493 /* UNUSED			0x00008000 */
494 #define	MNTK_VMSETSIZE_BUG	0x00010000
495 #define	MNTK_UNIONFS	0x00020000	/* A hack for F_ISUNIONSTACK */
496 #define	MNTK_FPLOOKUP	0x00040000	/* fast path lookup is supported */
497 #define	MNTK_SUSPEND_ALL	0x00080000 /* Suspended by all-fs suspension */
498 #define	MNTK_TASKQUEUE_WAITER	0x00100000 /* Waiting on unmount taskqueue */
499 /* UNUSED			0x00200000 */
500 /* UNUSED			0x00400000 */
501 #define	MNTK_NOASYNC	0x00800000	/* disable async */
502 #define	MNTK_UNMOUNT	0x01000000	/* unmount in progress */
503 #define	MNTK_MWAIT	0x02000000	/* waiting for unmount to finish */
504 #define	MNTK_SUSPEND	0x08000000	/* request write suspension */
505 #define	MNTK_SUSPEND2	0x04000000	/* block secondary writes */
506 #define	MNTK_SUSPENDED	0x10000000	/* write operations are suspended */
507 #define	MNTK_NULL_NOCACHE	0x20000000 /* auto disable cache for nullfs
508 					      mounts over this fs */
509 #define MNTK_LOOKUP_SHARED	0x40000000 /* FS supports shared lock lookups */
510 /* UNUSED			0x80000000 */
511 
512 #ifdef _KERNEL
513 static inline int
514 MNT_SHARED_WRITES(struct mount *mp)
515 {
516 
517 	return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
518 }
519 
520 static inline int
521 MNT_EXTENDED_SHARED(struct mount *mp)
522 {
523 
524 	return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
525 }
526 #endif
527 
528 /*
529  * Sysctl CTL_VFS definitions.
530  *
531  * Second level identifier specifies which filesystem. Second level
532  * identifier VFS_VFSCONF returns information about all filesystems.
533  * Second level identifier VFS_GENERIC is non-terminal.
534  */
535 #define	VFS_VFSCONF		0	/* get configured filesystems */
536 #define	VFS_GENERIC		0	/* generic filesystem information */
537 /*
538  * Third level identifiers for VFS_GENERIC are given below; third
539  * level identifiers for specific filesystems are given in their
540  * mount specific header files.
541  */
542 #define VFS_MAXTYPENUM	1	/* int: highest defined filesystem type */
543 #define VFS_CONF	2	/* struct: vfsconf for filesystem given
544 				   as next argument */
545 
546 /*
547  * Flags for various system call interfaces.
548  *
549  * waitfor flags to vfs_sync() and getfsstat()
550  */
551 #define MNT_WAIT	1	/* synchronously wait for I/O to complete */
552 #define MNT_NOWAIT	2	/* start all I/O, but do not wait for it */
553 #define MNT_LAZY	3	/* push data not written by filesystem syncer */
554 #define MNT_SUSPEND	4	/* Suspend file system after sync */
555 
556 /*
557  * Generic file handle
558  */
559 struct fhandle {
560 	fsid_t	fh_fsid;	/* Filesystem id of mount point */
561 	struct	fid fh_fid;	/* Filesys specific id */
562 };
563 typedef struct fhandle	fhandle_t;
564 
565 /*
566  * Old export arguments without security flavor list
567  */
568 struct oexport_args {
569 	int	ex_flags;		/* export related flags */
570 	uid_t	ex_root;		/* mapping for root uid */
571 	struct	xucred ex_anon;		/* mapping for anonymous user */
572 	struct	sockaddr *ex_addr;	/* net address to which exported */
573 	u_char	ex_addrlen;		/* and the net address length */
574 	struct	sockaddr *ex_mask;	/* mask of valid bits in saddr */
575 	u_char	ex_masklen;		/* and the smask length */
576 	char	*ex_indexfile;		/* index file for WebNFS URLs */
577 };
578 
579 /*
580  * Not quite so old export arguments with 32bit ex_flags and xucred ex_anon.
581  */
582 #define	MAXSECFLAVORS	5
583 struct o2export_args {
584 	int	ex_flags;		/* export related flags */
585 	uid_t	ex_root;		/* mapping for root uid */
586 	struct	xucred ex_anon;		/* mapping for anonymous user */
587 	struct	sockaddr *ex_addr;	/* net address to which exported */
588 	u_char	ex_addrlen;		/* and the net address length */
589 	struct	sockaddr *ex_mask;	/* mask of valid bits in saddr */
590 	u_char	ex_masklen;		/* and the smask length */
591 	char	*ex_indexfile;		/* index file for WebNFS URLs */
592 	int	ex_numsecflavors;	/* security flavor count */
593 	int	ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
594 };
595 
596 /*
597  * Export arguments for local filesystem mount calls.
598  */
599 struct export_args {
600 	uint64_t ex_flags;		/* export related flags */
601 	uid_t	ex_root;		/* mapping for root uid */
602 	uid_t	ex_uid;			/* mapping for anonymous user */
603 	int	ex_ngroups;
604 	gid_t	*ex_groups;
605 	struct	sockaddr *ex_addr;	/* net address to which exported */
606 	u_char	ex_addrlen;		/* and the net address length */
607 	struct	sockaddr *ex_mask;	/* mask of valid bits in saddr */
608 	u_char	ex_masklen;		/* and the smask length */
609 	char	*ex_indexfile;		/* index file for WebNFS URLs */
610 	int	ex_numsecflavors;	/* security flavor count */
611 	int	ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
612 };
613 
614 /*
615  * Structure holding information for a publicly exported filesystem
616  * (WebNFS). Currently the specs allow just for one such filesystem.
617  */
618 struct nfs_public {
619 	int		np_valid;	/* Do we hold valid information */
620 	fhandle_t	np_handle;	/* Filehandle for pub fs (internal) */
621 	struct mount	*np_mount;	/* Mountpoint of exported fs */
622 	char		*np_index;	/* Index file */
623 };
624 
625 /*
626  * Filesystem configuration information. One of these exists for each
627  * type of filesystem supported by the kernel. These are searched at
628  * mount time to identify the requested filesystem.
629  *
630  * XXX: Never change the first two arguments!
631  */
632 struct vfsconf {
633 	u_int	vfc_version;		/* ABI version number */
634 	char	vfc_name[MFSNAMELEN];	/* filesystem type name */
635 	struct	vfsops *vfc_vfsops;	/* filesystem operations vector */
636 	struct	vfsops *vfc_vfsops_sd;	/* ... signal-deferred */
637 	int	vfc_typenum;		/* historic filesystem type number */
638 	int	vfc_refcount;		/* number mounted of this type */
639 	int	vfc_flags;		/* permanent flags */
640 	int	vfc_prison_flag;	/* prison allow.mount.* flag */
641 	struct	vfsoptdecl *vfc_opts;	/* mount options */
642 	TAILQ_ENTRY(vfsconf) vfc_list;	/* list of vfscons */
643 };
644 
645 /* Userland version of the struct vfsconf. */
646 struct xvfsconf {
647 	struct	vfsops *vfc_vfsops;	/* filesystem operations vector */
648 	char	vfc_name[MFSNAMELEN];	/* filesystem type name */
649 	int	vfc_typenum;		/* historic filesystem type number */
650 	int	vfc_refcount;		/* number mounted of this type */
651 	int	vfc_flags;		/* permanent flags */
652 	struct	vfsconf *vfc_next;	/* next in list */
653 };
654 
655 #ifndef BURN_BRIDGES
656 struct ovfsconf {
657 	void	*vfc_vfsops;
658 	char	vfc_name[32];
659 	int	vfc_index;
660 	int	vfc_refcount;
661 	int	vfc_flags;
662 };
663 #endif
664 
665 /*
666  * NB: these flags refer to IMPLEMENTATION properties, not properties of
667  * any actual mounts; i.e., it does not make sense to change the flags.
668  */
669 #define	VFCF_STATIC	0x00010000	/* statically compiled into kernel */
670 #define	VFCF_NETWORK	0x00020000	/* may get data over the network */
671 #define	VFCF_READONLY	0x00040000	/* writes are not implemented */
672 #define	VFCF_SYNTHETIC	0x00080000	/* data does not represent real files */
673 #define	VFCF_LOOPBACK	0x00100000	/* aliases some other mounted FS */
674 #define	VFCF_UNICODE	0x00200000	/* stores file names as Unicode */
675 #define	VFCF_JAIL	0x00400000	/* can be mounted from within a jail */
676 #define	VFCF_DELEGADMIN	0x00800000	/* supports delegated administration */
677 #define	VFCF_SBDRY	0x01000000	/* Stop at Boundary: defer stop requests
678 					   to kernel->user (AST) transition */
679 
680 typedef uint32_t fsctlop_t;
681 
682 struct vfsidctl {
683 	int		vc_vers;	/* should be VFSIDCTL_VERS1 (below) */
684 	fsid_t		vc_fsid;	/* fsid to operate on */
685 	char		vc_fstypename[MFSNAMELEN];
686 					/* type of fs 'nfs' or '*' */
687 	fsctlop_t	vc_op;		/* operation VFS_CTL_* (below) */
688 	void		*vc_ptr;	/* pointer to data structure */
689 	size_t		vc_len;		/* sizeof said structure */
690 	u_int32_t	vc_spare[12];	/* spare (must be zero) */
691 };
692 
693 /* vfsidctl API version. */
694 #define VFS_CTL_VERS1	0x01
695 
696 /*
697  * New style VFS sysctls, do not reuse/conflict with the namespace for
698  * private sysctls.
699  * All "global" sysctl ops have the 33rd bit set:
700  * 0x...1....
701  * Private sysctl ops should have the 33rd bit unset.
702  */
703 #define VFS_CTL_QUERY	0x00010001	/* anything wrong? (vfsquery) */
704 #define VFS_CTL_TIMEO	0x00010002	/* set timeout for vfs notification */
705 #define VFS_CTL_NOLOCKS	0x00010003	/* disable file locking */
706 
707 struct vfsquery {
708 	u_int32_t	vq_flags;
709 	u_int32_t	vq_spare[31];
710 };
711 
712 /* vfsquery flags */
713 #define VQ_NOTRESP	0x0001	/* server down */
714 #define VQ_NEEDAUTH	0x0002	/* server bad auth */
715 #define VQ_LOWDISK	0x0004	/* we're low on space */
716 #define VQ_MOUNT	0x0008	/* new filesystem arrived */
717 #define VQ_UNMOUNT	0x0010	/* filesystem has left */
718 #define VQ_DEAD		0x0020	/* filesystem is dead, needs force unmount */
719 #define VQ_ASSIST	0x0040	/* filesystem needs assistance from external
720 				   program */
721 #define VQ_NOTRESPLOCK	0x0080	/* server lockd down */
722 #define VQ_FLAG0100	0x0100	/* placeholder */
723 #define VQ_FLAG0200	0x0200	/* placeholder */
724 #define VQ_FLAG0400	0x0400	/* placeholder */
725 #define VQ_FLAG0800	0x0800	/* placeholder */
726 #define VQ_FLAG1000	0x1000	/* placeholder */
727 #define VQ_FLAG2000	0x2000	/* placeholder */
728 #define VQ_FLAG4000	0x4000	/* placeholder */
729 #define VQ_FLAG8000	0x8000	/* placeholder */
730 
731 #ifdef _KERNEL
732 /* Point a sysctl request at a vfsidctl's data. */
733 #define VCTLTOREQ(vc, req)						\
734 	do {								\
735 		(req)->newptr = (vc)->vc_ptr;				\
736 		(req)->newlen = (vc)->vc_len;				\
737 		(req)->newidx = 0;					\
738 	} while (0)
739 #endif
740 
741 struct iovec;
742 struct uio;
743 
744 #ifdef _KERNEL
745 
746 /*
747  * vfs_busy specific flags and mask.
748  */
749 #define	MBF_NOWAIT	0x01
750 #define	MBF_MNTLSTLOCK	0x02
751 #define	MBF_MASK	(MBF_NOWAIT | MBF_MNTLSTLOCK)
752 
753 #ifdef MALLOC_DECLARE
754 MALLOC_DECLARE(M_MOUNT);
755 MALLOC_DECLARE(M_STATFS);
756 #endif
757 extern int maxvfsconf;		/* highest defined filesystem type */
758 
759 TAILQ_HEAD(vfsconfhead, vfsconf);
760 extern struct vfsconfhead vfsconf;
761 
762 /*
763  * Operations supported on mounted filesystem.
764  */
765 struct mount_args;
766 struct nameidata;
767 struct sysctl_req;
768 struct mntarg;
769 
770 /*
771  * N.B., vfs_cmount is the ancient vfsop invoked by the old mount(2) syscall.
772  * The new way is vfs_mount.
773  *
774  * vfs_cmount implementations typically translate arguments from their
775  * respective old per-FS structures into the key-value list supported by
776  * nmount(2), then use kernel_mount(9) to mimic nmount(2) from kernelspace.
777  *
778  * Filesystems with mounters that use nmount(2) do not need to and should not
779  * implement vfs_cmount.  Hopefully a future cleanup can remove vfs_cmount and
780  * mount(2) entirely.
781  */
782 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
783 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
784 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
785 typedef	int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg,
786 		    bool *mp_busy);
787 typedef	int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
788 typedef	int vfs_sync_t(struct mount *mp, int waitfor);
789 typedef	int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
790 		    struct vnode **vpp);
791 typedef	int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
792 		    int flags, struct vnode **vpp);
793 typedef	int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
794 		    uint64_t *extflagsp, struct ucred **credanonp,
795 		    int *numsecflavors, int *secflavors);
796 typedef	int vfs_init_t(struct vfsconf *);
797 typedef	int vfs_uninit_t(struct vfsconf *);
798 typedef	int vfs_extattrctl_t(struct mount *mp, int cmd,
799 		    struct vnode *filename_vp, int attrnamespace,
800 		    const char *attrname);
801 typedef	int vfs_mount_t(struct mount *mp);
802 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
803 		    struct sysctl_req *req);
804 typedef void vfs_susp_clean_t(struct mount *mp);
805 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
806 typedef void vfs_purge_t(struct mount *mp);
807 struct sbuf;
808 typedef int vfs_report_lockf_t(struct mount *mp, struct sbuf *sb);
809 
810 struct vfsops {
811 	vfs_mount_t		*vfs_mount;
812 	vfs_cmount_t		*vfs_cmount;
813 	vfs_unmount_t		*vfs_unmount;
814 	vfs_root_t		*vfs_root;
815 	vfs_root_t		*vfs_cachedroot;
816 	vfs_quotactl_t		*vfs_quotactl;
817 	vfs_statfs_t		*vfs_statfs;
818 	vfs_sync_t		*vfs_sync;
819 	vfs_vget_t		*vfs_vget;
820 	vfs_fhtovp_t		*vfs_fhtovp;
821 	vfs_checkexp_t		*vfs_checkexp;
822 	vfs_init_t		*vfs_init;
823 	vfs_uninit_t		*vfs_uninit;
824 	vfs_extattrctl_t	*vfs_extattrctl;
825 	vfs_sysctl_t		*vfs_sysctl;
826 	vfs_susp_clean_t	*vfs_susp_clean;
827 	vfs_notify_lowervp_t	*vfs_reclaim_lowervp;
828 	vfs_notify_lowervp_t	*vfs_unlink_lowervp;
829 	vfs_purge_t		*vfs_purge;
830 	vfs_report_lockf_t	*vfs_report_lockf;
831 	vfs_mount_t		*vfs_spare[6];	/* spares for ABI compat */
832 };
833 
834 vfs_statfs_t	__vfs_statfs;
835 
836 #define	VFS_MOUNT(MP) ({						\
837 	int _rc;							\
838 									\
839 	TSRAW(curthread, TS_ENTER, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
840 	_rc = (*(MP)->mnt_op->vfs_mount)(MP);				\
841 	TSRAW(curthread, TS_EXIT, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
842 	_rc; })
843 
844 #define	VFS_UNMOUNT(MP, FORCE) ({					\
845 	int _rc;							\
846 									\
847 	_rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE);			\
848 	_rc; })
849 
850 #define	VFS_ROOT(MP, FLAGS, VPP) ({					\
851 	int _rc;							\
852 									\
853 	_rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP);		\
854 	_rc; })
855 
856 #define	VFS_CACHEDROOT(MP, FLAGS, VPP) ({				\
857 	int _rc;							\
858 									\
859 	_rc = (*(MP)->mnt_op->vfs_cachedroot)(MP, FLAGS, VPP);		\
860 	_rc; })
861 
862 #define	VFS_QUOTACTL(MP, C, U, A, MP_BUSY) ({				\
863 	int _rc;							\
864 									\
865 	_rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, MP_BUSY);	\
866 	_rc; })
867 
868 #define	VFS_STATFS(MP, SBP) ({						\
869 	int _rc;							\
870 									\
871 	_rc = __vfs_statfs((MP), (SBP));				\
872 	_rc; })
873 
874 #define	VFS_SYNC(MP, WAIT) ({						\
875 	int _rc;							\
876 									\
877 	_rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT);			\
878 	_rc; })
879 
880 #define	VFS_VGET(MP, INO, FLAGS, VPP) ({				\
881 	int _rc;							\
882 									\
883 	_rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP);		\
884 	_rc; })
885 
886 #define	VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({				\
887 	int _rc;							\
888 									\
889 	_rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP);	\
890 	_rc; })
891 
892 #define	VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({		\
893 	int _rc;							\
894 									\
895 	_rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
896 	    SEC);							\
897 	_rc; })
898 
899 #define	VFS_EXTATTRCTL(MP, C, FN, NS, N) ({				\
900 	int _rc;							\
901 									\
902 	_rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N);	\
903 	_rc; })
904 
905 #define	VFS_SYSCTL(MP, OP, REQ) ({					\
906 	int _rc;							\
907 									\
908 	_rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ);			\
909 	_rc; })
910 
911 #define	VFS_SUSP_CLEAN(MP) do {						\
912 	if (*(MP)->mnt_op->vfs_susp_clean != NULL) {			\
913 		(*(MP)->mnt_op->vfs_susp_clean)(MP);			\
914 	}								\
915 } while (0)
916 
917 #define	VFS_RECLAIM_LOWERVP(MP, VP) do {				\
918 	if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) {		\
919 		(*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP));	\
920 	}								\
921 } while (0)
922 
923 #define	VFS_UNLINK_LOWERVP(MP, VP) do {					\
924 	if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) {		\
925 		(*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP));	\
926 	}								\
927 } while (0)
928 
929 #define	VFS_PURGE(MP) do {						\
930 	if (*(MP)->mnt_op->vfs_purge != NULL) {				\
931 		(*(MP)->mnt_op->vfs_purge)(MP);				\
932 	}								\
933 } while (0)
934 
935 #define VFS_KNOTE_LOCKED(vp, hint) do					\
936 {									\
937 	VN_KNOTE((vp), (hint), KNF_LISTLOCKED);				\
938 } while (0)
939 
940 #define VFS_KNOTE_UNLOCKED(vp, hint) do					\
941 {									\
942 	VN_KNOTE((vp), (hint), 0);					\
943 } while (0)
944 
945 #include <sys/module.h>
946 
947 /*
948  * Version numbers.
949  */
950 #define VFS_VERSION_00	0x19660120
951 #define VFS_VERSION_01	0x20121030
952 #define VFS_VERSION_02	0x20180504
953 #define VFS_VERSION	VFS_VERSION_02
954 
955 #define VFS_SET(vfsops, fsname, flags) \
956 	static struct vfsconf fsname ## _vfsconf = {		\
957 		.vfc_version = VFS_VERSION,			\
958 		.vfc_name = #fsname,				\
959 		.vfc_vfsops = &vfsops,				\
960 		.vfc_typenum = -1,				\
961 		.vfc_flags = flags,				\
962 	};							\
963 	static moduledata_t fsname ## _mod = {			\
964 		#fsname,					\
965 		vfs_modevent,					\
966 		& fsname ## _vfsconf				\
967 	};							\
968 	DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
969 
970 enum vfs_notify_upper_type {
971 	VFS_NOTIFY_UPPER_RECLAIM,
972 	VFS_NOTIFY_UPPER_UNLINK,
973 };
974 
975 /*
976  * exported vnode operations
977  */
978 
979 int	dounmount(struct mount *, uint64_t, struct thread *);
980 
981 int	kernel_mount(struct mntarg *ma, uint64_t flags);
982 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
983 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
984 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
985 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
986 void	statfs_scale_blocks(struct statfs *sf, long max_size);
987 struct vfsconf *vfs_byname(const char *);
988 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
989 void	vfs_mount_destroy(struct mount *);
990 void	vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
991 void	vfs_freeopts(struct vfsoptlist *opts);
992 void	vfs_deleteopt(struct vfsoptlist *opts, const char *name);
993 int	vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
994 int	vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
995 	    uint64_t val);
996 int	vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
997 int	vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
998 int	vfs_getopt_size(struct vfsoptlist *opts, const char *name,
999 	    off_t *value);
1000 char	*vfs_getopts(struct vfsoptlist *, const char *, int *error);
1001 int	vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
1002 int	vfs_filteropt(struct vfsoptlist *, const char **legal);
1003 void	vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
1004 int	vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
1005 int	vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
1006 	    int len);
1007 int	vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
1008 	    int len);
1009 int	vfs_setopts(struct vfsoptlist *opts, const char *name,
1010 	    const char *value);
1011 int	vfs_setpublicfs			    /* set publicly exported fs */
1012 	    (struct mount *, struct netexport *, struct export_args *);
1013 void	vfs_periodic(struct mount *, int);
1014 int	vfs_busy(struct mount *, int);
1015 int	vfs_export			 /* process mount export info */
1016 	    (struct mount *, struct export_args *);
1017 void	vfs_allocate_syncvnode(struct mount *);
1018 void	vfs_deallocate_syncvnode(struct mount *);
1019 int	vfs_donmount(struct thread *td, uint64_t fsflags,
1020 	    struct uio *fsoptions);
1021 void	vfs_getnewfsid(struct mount *);
1022 struct	mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
1023 struct	mount *vfs_busyfs(fsid_t *);
1024 int	vfs_modevent(module_t, int, void *);
1025 void	vfs_mount_error(struct mount *, const char *, ...);
1026 void	vfs_mountroot(void);			/* mount our root filesystem */
1027 void	vfs_mountedfrom(struct mount *, const char *from);
1028 void	vfs_notify_upper(struct vnode *, enum vfs_notify_upper_type);
1029 struct mount *vfs_ref_from_vp(struct vnode *);
1030 void	vfs_ref(struct mount *);
1031 void	vfs_rel(struct mount *);
1032 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
1033 	    struct ucred *);
1034 int	vfs_suser(struct mount *, struct thread *);
1035 void	vfs_unbusy(struct mount *);
1036 void	vfs_unmountall(void);
1037 struct mount *vfs_register_upper_from_vp(struct vnode *,
1038 	    struct mount *ump, struct mount_upper_node *);
1039 void	vfs_register_for_notification(struct mount *, struct mount *,
1040 	    struct mount_upper_node *);
1041 void	vfs_unregister_for_notification(struct mount *,
1042 	    struct mount_upper_node *);
1043 void	vfs_unregister_upper(struct mount *, struct mount_upper_node *);
1044 int	vfs_remount_ro(struct mount *mp);
1045 int	vfs_report_lockf(struct mount *mp, struct sbuf *sb);
1046 
1047 extern	TAILQ_HEAD(mntlist, mount) mountlist;	/* mounted filesystem list */
1048 extern	struct mtx_padalign mountlist_mtx;
1049 extern	struct nfs_public nfs_pub;
1050 extern	struct sx vfsconf_sx;
1051 #define	vfsconf_lock()		sx_xlock(&vfsconf_sx)
1052 #define	vfsconf_unlock()	sx_xunlock(&vfsconf_sx)
1053 #define	vfsconf_slock()		sx_slock(&vfsconf_sx)
1054 #define	vfsconf_sunlock()	sx_sunlock(&vfsconf_sx)
1055 struct vnode *mntfs_allocvp(struct mount *, struct vnode *);
1056 void   mntfs_freevp(struct vnode *);
1057 
1058 /*
1059  * Declarations for these vfs default operations are located in
1060  * kern/vfs_default.c.  They will be automatically used to replace
1061  * null entries in VFS ops tables when registering a new filesystem
1062  * type in the global table.
1063  */
1064 vfs_root_t		vfs_stdroot;
1065 vfs_quotactl_t		vfs_stdquotactl;
1066 vfs_statfs_t		vfs_stdstatfs;
1067 vfs_sync_t		vfs_stdsync;
1068 vfs_sync_t		vfs_stdnosync;
1069 vfs_vget_t		vfs_stdvget;
1070 vfs_fhtovp_t		vfs_stdfhtovp;
1071 vfs_checkexp_t		vfs_stdcheckexp;
1072 vfs_init_t		vfs_stdinit;
1073 vfs_uninit_t		vfs_stduninit;
1074 vfs_extattrctl_t	vfs_stdextattrctl;
1075 vfs_sysctl_t		vfs_stdsysctl;
1076 
1077 void	syncer_suspend(void);
1078 void	syncer_resume(void);
1079 
1080 struct vnode *vfs_cache_root_clear(struct mount *);
1081 void	vfs_cache_root_set(struct mount *, struct vnode *);
1082 
1083 void	vfs_op_barrier_wait(struct mount *);
1084 void	vfs_op_enter(struct mount *);
1085 void	vfs_op_exit_locked(struct mount *);
1086 void	vfs_op_exit(struct mount *);
1087 
1088 #ifdef DIAGNOSTIC
1089 void	vfs_assert_mount_counters(struct mount *);
1090 void	vfs_dump_mount_counters(struct mount *);
1091 #else
1092 #define vfs_assert_mount_counters(mp) do { } while (0)
1093 #define vfs_dump_mount_counters(mp) do { } while (0)
1094 #endif
1095 
1096 enum mount_counter { MNT_COUNT_REF, MNT_COUNT_LOCKREF, MNT_COUNT_WRITEOPCOUNT };
1097 int	vfs_mount_fetch_counter(struct mount *, enum mount_counter);
1098 
1099 void suspend_all_fs(void);
1100 void resume_all_fs(void);
1101 
1102 /*
1103  * Code transitioning mnt_vfs_ops to > 0 issues IPIs until it observes
1104  * all CPUs not executing code enclosed by thread_in_ops_pcpu variable.
1105  *
1106  * This provides an invariant that by the time the last CPU is observed not
1107  * executing, everyone else entering will see the counter > 0 and exit.
1108  *
1109  * Note there is no barrier between vfs_ops and the rest of the code in the
1110  * section. It is not necessary as the writer has to wait for everyone to drain
1111  * before making any changes or only make changes safe while the section is
1112  * executed.
1113  */
1114 #define	vfs_mount_pcpu(mp)		zpcpu_get(mp->mnt_pcpu)
1115 #define	vfs_mount_pcpu_remote(mp, cpu)	zpcpu_get_cpu(mp->mnt_pcpu, cpu)
1116 
1117 #define vfs_op_thread_entered(mp) ({				\
1118 	MPASS(curthread->td_critnest > 0);			\
1119 	struct mount_pcpu *_mpcpu = vfs_mount_pcpu(mp);		\
1120 	_mpcpu->mntp_thread_in_ops == 1;			\
1121 })
1122 
1123 #define vfs_op_thread_enter_crit(mp, _mpcpu) ({			\
1124 	bool _retval_crit = true;				\
1125 	MPASS(curthread->td_critnest > 0);			\
1126 	_mpcpu = vfs_mount_pcpu(mp);				\
1127 	MPASS(mpcpu->mntp_thread_in_ops == 0);			\
1128 	_mpcpu->mntp_thread_in_ops = 1;				\
1129 	atomic_interrupt_fence();					\
1130 	if (__predict_false(mp->mnt_vfs_ops > 0)) {		\
1131 		vfs_op_thread_exit_crit(mp, _mpcpu);		\
1132 		_retval_crit = false;				\
1133 	}							\
1134 	_retval_crit;						\
1135 })
1136 
1137 #define vfs_op_thread_enter(mp, _mpcpu) ({			\
1138 	bool _retval;						\
1139 	critical_enter();					\
1140 	_retval = vfs_op_thread_enter_crit(mp, _mpcpu);		\
1141 	if (__predict_false(!_retval))				\
1142 		critical_exit();				\
1143 	_retval;						\
1144 })
1145 
1146 #define vfs_op_thread_exit_crit(mp, _mpcpu) do {		\
1147 	MPASS(_mpcpu == vfs_mount_pcpu(mp));			\
1148 	MPASS(_mpcpu->mntp_thread_in_ops == 1);			\
1149 	atomic_interrupt_fence();					\
1150 	_mpcpu->mntp_thread_in_ops = 0;				\
1151 } while (0)
1152 
1153 #define vfs_op_thread_exit(mp, _mpcpu) do {			\
1154 	vfs_op_thread_exit_crit(mp, _mpcpu);			\
1155 	critical_exit();					\
1156 } while (0)
1157 
1158 #define vfs_mp_count_add_pcpu(_mpcpu, count, val) do {		\
1159 	MPASS(_mpcpu->mntp_thread_in_ops == 1);			\
1160 	_mpcpu->mntp_##count += val;				\
1161 } while (0)
1162 
1163 #define vfs_mp_count_sub_pcpu(_mpcpu, count, val) do {		\
1164 	MPASS(_mpcpu->mntp_thread_in_ops == 1);			\
1165 	_mpcpu->mntp_##count -= val;				\
1166 } while (0)
1167 
1168 #else /* !_KERNEL */
1169 
1170 #include <sys/cdefs.h>
1171 
1172 struct stat;
1173 
1174 __BEGIN_DECLS
1175 int	fhlink(struct fhandle *, const char *);
1176 int	fhlinkat(struct fhandle *, int, const char *);
1177 int	fhopen(const struct fhandle *, int);
1178 int	fhreadlink(struct fhandle *, char *, size_t);
1179 int	fhstat(const struct fhandle *, struct stat *);
1180 int	fhstatfs(const struct fhandle *, struct statfs *);
1181 int	fstatfs(int, struct statfs *);
1182 int	getfh(const char *, fhandle_t *);
1183 int	getfhat(int, char *, struct fhandle *, int);
1184 int	getfsstat(struct statfs *, long, int);
1185 int	getmntinfo(struct statfs **, int);
1186 int	lgetfh(const char *, fhandle_t *);
1187 int	mount(const char *, const char *, int, void *);
1188 int	nmount(struct iovec *, unsigned int, int);
1189 int	statfs(const char *, struct statfs *);
1190 int	unmount(const char *, int);
1191 
1192 /* C library stuff */
1193 int	getvfsbyname(const char *, struct xvfsconf *);
1194 __END_DECLS
1195 
1196 #endif /* _KERNEL */
1197 
1198 #endif /* !_SYS_MOUNT_H_ */
1199