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/lock.h>
42 #include <sys/lockmgr.h>
43 #include <sys/tslog.h>
44 #include <sys/_mutex.h>
45 #include <sys/_sx.h>
46 #endif
47
48 /*
49 * NOTE: When changing statfs structure, mount structure, MNT_* flags or
50 * MNTK_* flags also update DDB show mount command in vfs_subr.c.
51 */
52
53 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
54
55 /*
56 * File identifier.
57 * These are unique per filesystem on a single machine.
58 */
59 #define MAXFIDSZ 16
60
61 struct fid {
62 u_short fid_len; /* length of data in bytes */
63 u_short fid_data0; /* force longword alignment */
64 char fid_data[MAXFIDSZ]; /* data (variable length) */
65 };
66
67 /*
68 * filesystem statistics
69 */
70 #define MFSNAMELEN 16 /* length of type name including null */
71 #define MNAMELEN 1024 /* size of on/from name bufs */
72 #define STATFS_VERSION 0x20140518 /* current version number */
73 struct statfs {
74 uint32_t f_version; /* structure version number */
75 uint32_t f_type; /* type of filesystem */
76 uint64_t f_flags; /* copy of mount exported flags */
77 uint64_t f_bsize; /* filesystem fragment size */
78 uint64_t f_iosize; /* optimal transfer block size */
79 uint64_t f_blocks; /* total data blocks in filesystem */
80 uint64_t f_bfree; /* free blocks in filesystem */
81 int64_t f_bavail; /* free blocks avail to non-superuser */
82 uint64_t f_files; /* total file nodes in filesystem */
83 int64_t f_ffree; /* free nodes avail to non-superuser */
84 uint64_t f_syncwrites; /* count of sync writes since mount */
85 uint64_t f_asyncwrites; /* count of async writes since mount */
86 uint64_t f_syncreads; /* count of sync reads since mount */
87 uint64_t f_asyncreads; /* count of async reads since mount */
88 uint64_t f_spare[10]; /* unused spare */
89 uint32_t f_namemax; /* maximum filename length */
90 uid_t f_owner; /* user that mounted the filesystem */
91 fsid_t f_fsid; /* filesystem id */
92 char f_charspare[80]; /* spare string space */
93 char f_fstypename[MFSNAMELEN]; /* filesystem type name */
94 char f_mntfromname[MNAMELEN]; /* mounted filesystem */
95 char f_mntonname[MNAMELEN]; /* directory on which mounted */
96 };
97
98 #if defined(_WANT_FREEBSD11_STATFS) || defined(_KERNEL)
99 #define FREEBSD11_STATFS_VERSION 0x20030518 /* current version number */
100 struct freebsd11_statfs {
101 uint32_t f_version; /* structure version number */
102 uint32_t f_type; /* type of filesystem */
103 uint64_t f_flags; /* copy of mount exported flags */
104 uint64_t f_bsize; /* filesystem fragment size */
105 uint64_t f_iosize; /* optimal transfer block size */
106 uint64_t f_blocks; /* total data blocks in filesystem */
107 uint64_t f_bfree; /* free blocks in filesystem */
108 int64_t f_bavail; /* free blocks avail to non-superuser */
109 uint64_t f_files; /* total file nodes in filesystem */
110 int64_t f_ffree; /* free nodes avail to non-superuser */
111 uint64_t f_syncwrites; /* count of sync writes since mount */
112 uint64_t f_asyncwrites; /* count of async writes since mount */
113 uint64_t f_syncreads; /* count of sync reads since mount */
114 uint64_t f_asyncreads; /* count of async reads since mount */
115 uint64_t f_spare[10]; /* unused spare */
116 uint32_t f_namemax; /* maximum filename length */
117 uid_t f_owner; /* user that mounted the filesystem */
118 fsid_t f_fsid; /* filesystem id */
119 char f_charspare[80]; /* spare string space */
120 char f_fstypename[16]; /* filesystem type name */
121 char f_mntfromname[88]; /* mounted filesystem */
122 char f_mntonname[88]; /* directory on which mounted */
123 };
124 #endif /* _WANT_FREEBSD11_STATFS || _KERNEL */
125
126 #ifdef _KERNEL
127 #define OMFSNAMELEN 16 /* length of fs type name, including null */
128 #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
129
130 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
131 /* XXX statfs.2 is out of date with read counter changes here. */
132 struct ostatfs {
133 long f_spare2; /* placeholder */
134 long f_bsize; /* fundamental filesystem block size */
135 long f_iosize; /* optimal transfer block size */
136 long f_blocks; /* total data blocks in filesystem */
137 long f_bfree; /* free blocks in fs */
138 long f_bavail; /* free blocks avail to non-superuser */
139 long f_files; /* total file nodes in filesystem */
140 long f_ffree; /* free file nodes in fs */
141 fsid_t f_fsid; /* filesystem id */
142 uid_t f_owner; /* user that mounted the filesystem */
143 int f_type; /* type of filesystem */
144 int f_flags; /* copy of mount exported flags */
145 long f_syncwrites; /* count of sync writes since mount */
146 long f_asyncwrites; /* count of async writes since mount */
147 char f_fstypename[OMFSNAMELEN]; /* fs type name */
148 char f_mntonname[OMNAMELEN]; /* directory on which mounted */
149 long f_syncreads; /* count of sync reads since mount */
150 long f_asyncreads; /* count of async reads since mount */
151 short f_spares1; /* unused spare */
152 char f_mntfromname[OMNAMELEN];/* mounted filesystem */
153 short f_spares2; /* unused spare */
154 /*
155 * XXX on machines where longs are aligned to 8-byte boundaries, there
156 * is an unnamed int32_t here. This spare was after the apparent end
157 * of the struct until we bit off the read counters from f_mntonname.
158 */
159 long f_spare[2]; /* unused spare */
160 };
161
162 TAILQ_HEAD(vnodelst, vnode);
163
164 /* Mount options list */
165 TAILQ_HEAD(vfsoptlist, vfsopt);
166 struct vfsopt {
167 TAILQ_ENTRY(vfsopt) link;
168 char *name;
169 void *value;
170 int len;
171 int pos;
172 int seen;
173 };
174
175 /*
176 * Structure per mounted filesystem. Each mounted filesystem has an
177 * array of operations and an instance record. The filesystems are
178 * put on a doubly linked list.
179 *
180 * Lock reference:
181 * l - mnt_listmtx
182 * m - mountlist_mtx
183 * i - interlock
184 * v - vnode freelist mutex
185 *
186 * Unmarked fields are considered stable as long as a ref is held.
187 *
188 */
189 struct mount {
190 struct mtx mnt_mtx; /* mount structure interlock */
191 int mnt_gen; /* struct mount generation */
192 #define mnt_startzero mnt_list
193 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
194 struct vfsops *mnt_op; /* operations on fs */
195 struct vfsconf *mnt_vfc; /* configuration info */
196 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
197 struct vnode *mnt_syncer; /* syncer vnode */
198 int mnt_ref; /* (i) Reference count */
199 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
200 int mnt_nvnodelistsize; /* (i) # of vnodes */
201 int mnt_writeopcount; /* (i) write syscalls pending */
202 int mnt_kern_flag; /* (i) kernel only flags */
203 uint64_t mnt_flag; /* (i) flags shared with user */
204 struct vfsoptlist *mnt_opt; /* current mount options */
205 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
206 int mnt_maxsymlinklen; /* max size of short symlink */
207 struct statfs mnt_stat; /* cache of filesystem stats */
208 struct ucred *mnt_cred; /* credentials of mounter */
209 void * mnt_data; /* private data */
210 time_t mnt_time; /* last time written*/
211 int mnt_iosize_max; /* max size for clusters, etc */
212 struct netexport *mnt_export; /* export list */
213 struct label *mnt_label; /* MAC label for the fs */
214 u_int mnt_hashseed; /* Random seed for vfs_hash */
215 int mnt_lockref; /* (i) Lock reference count */
216 int mnt_secondary_writes; /* (i) # of secondary writes */
217 int mnt_secondary_accwrites;/* (i) secondary wr. starts */
218 struct thread *mnt_susp_owner; /* (i) thread owning suspension */
219 #define mnt_endzero mnt_gjprovider
220 char *mnt_gjprovider; /* gjournal provider name */
221 struct mtx mnt_listmtx;
222 struct vnodelst mnt_activevnodelist; /* (l) list of active vnodes */
223 int mnt_activevnodelistsize;/* (l) # of active vnodes */
224 struct vnodelst mnt_tmpfreevnodelist; /* (l) list of free vnodes */
225 int mnt_tmpfreevnodelistsize;/* (l) # of free vnodes */
226 struct lock mnt_explock; /* vfs_export walkers lock */
227 TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */
228 TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/
229 };
230
231 /*
232 * Definitions for MNT_VNODE_FOREACH_ALL.
233 */
234 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
235 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
236 void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
237
238 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \
239 for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \
240 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
241
242 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \
243 do { \
244 MNT_ILOCK(mp); \
245 __mnt_vnode_markerfree_all(&(mvp), (mp)); \
246 /* MNT_IUNLOCK(mp); -- done in above function */ \
247 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
248 } while (0)
249
250 /*
251 * Definitions for MNT_VNODE_FOREACH_ACTIVE.
252 */
253 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
254 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
255 void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
256
257 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \
258 for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \
259 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
260
261 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \
262 __mnt_vnode_markerfree_active(&(mvp), (mp))
263
264 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
265 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
266 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
267 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
268 #define MNT_REF(mp) (mp)->mnt_ref++
269 #define MNT_REL(mp) do { \
270 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
271 (mp)->mnt_ref--; \
272 if ((mp)->mnt_ref == 0) \
273 wakeup((mp)); \
274 } while (0)
275
276 #endif /* _KERNEL */
277
278 /*
279 * User specifiable flags, stored in mnt_flag.
280 */
281 #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */
282 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
283 #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */
284 #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */
285 #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */
286 #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */
287 #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */
288 #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */
289 #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */
290 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
291 #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */
292 #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */
293 #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */
294 #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */
295 #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */
296 #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */
297 #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */
298 #define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */
299 #define MNT_UNTRUSTED 0x0000000800000000ULL /* filesys metadata untrusted */
300
301 /*
302 * NFS export related mount flags.
303 */
304 #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */
305 #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */
306 #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */
307 #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */
308 #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */
309 #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */
310
311 /*
312 * Flags set by internal operations,
313 * but visible to the user.
314 * XXX some of these are not quite right.. (I've never seen the root flag set)
315 */
316 #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */
317 #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */
318 #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */
319 #define MNT_USER 0x0000000000008000ULL /* mounted by a user */
320 #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */
321 #define MNT_VERIFIED 0x0000000400000000ULL /* filesystem is verified */
322
323 /*
324 * Mask of flags that are visible to statfs().
325 * XXX I think that this could now become (~(MNT_CMDFLAGS))
326 * but the 'mount' program may need changing to handle this.
327 */
328 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
329 MNT_NOSUID | MNT_UNION | MNT_SUJ | \
330 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
331 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
332 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
333 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
334 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
335 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
336 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \
337 MNT_NFS4ACLS | MNT_AUTOMOUNTED | MNT_VERIFIED | \
338 MNT_UNTRUSTED)
339
340 /* Mask of flags that can be updated. */
341 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
342 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
343 MNT_NOATIME | \
344 MNT_NOSYMFOLLOW | MNT_IGNORE | \
345 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
346 MNT_ACLS | MNT_USER | MNT_NFS4ACLS | \
347 MNT_AUTOMOUNTED | MNT_UNTRUSTED)
348
349 /*
350 * External filesystem command modifier flags.
351 * Unmount can use the MNT_FORCE flag.
352 * XXX: These are not STATES and really should be somewhere else.
353 * XXX: MNT_BYFSID and MNT_NONBUSY collide with MNT_ACLS and MNT_MULTILABEL,
354 * but because MNT_ACLS and MNT_MULTILABEL are only used for mount(2),
355 * and MNT_BYFSID and MNT_NONBUSY are only used for unmount(2),
356 * it's harmless.
357 */
358 #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */
359 #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */
360 #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */
361 #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */
362 #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */
363 #define MNT_NONBUSY 0x0000000004000000ULL /* check vnode use counts. */
364 #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */
365 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
366 MNT_FORCE | MNT_SNAPSHOT | MNT_NONBUSY | \
367 MNT_BYFSID)
368 /*
369 * Internal filesystem control flags stored in mnt_kern_flag.
370 *
371 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot
372 * proceed past the mount point. This keeps the subtree stable during
373 * mounts and unmounts. When non-forced unmount flushes all vnodes
374 * from the mp queue, the MNTK_UNMOUNT flag prevents insmntque() from
375 * queueing new vnodes.
376 *
377 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
378 * dounmount() is still waiting to lock the mountpoint. This allows
379 * the filesystem to cancel operations that might otherwise deadlock
380 * with the unmount attempt (used by NFS).
381 */
382 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
383 #define MNTK_ASYNC 0x00000002 /* filtered async flag */
384 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
385 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */
386 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
387 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
388 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
389 #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads
390 and writes. Filesystem shall properly
391 handle i/o state on EFAULT. */
392 #define MNTK_VGONE_UPPER 0x00000200
393 #define MNTK_VGONE_WAITER 0x00000400
394 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
395 #define MNTK_MARKER 0x00001000
396 #define MNTK_UNMAPPED_BUFS 0x00002000
397 #define MNTK_USES_BCACHE 0x00004000 /* FS uses the buffer cache. */
398 #define MNTK_TEXT_REFS 0x00008000 /* Keep use ref for text */
399 #define MNTK_NOASYNC 0x00800000 /* disable async */
400 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
401 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
402 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
403 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
404 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
405 #define MNTK_NULL_NOCACHE 0x20000000 /* auto disable cache for nullfs
406 mounts over this fs */
407 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
408 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
409
410 #ifdef _KERNEL
411 static inline int
MNT_SHARED_WRITES(struct mount * mp)412 MNT_SHARED_WRITES(struct mount *mp)
413 {
414
415 return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
416 }
417
418 static inline int
MNT_EXTENDED_SHARED(struct mount * mp)419 MNT_EXTENDED_SHARED(struct mount *mp)
420 {
421
422 return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
423 }
424 #endif
425
426 /*
427 * Sysctl CTL_VFS definitions.
428 *
429 * Second level identifier specifies which filesystem. Second level
430 * identifier VFS_VFSCONF returns information about all filesystems.
431 * Second level identifier VFS_GENERIC is non-terminal.
432 */
433 #define VFS_VFSCONF 0 /* get configured filesystems */
434 #define VFS_GENERIC 0 /* generic filesystem information */
435 /*
436 * Third level identifiers for VFS_GENERIC are given below; third
437 * level identifiers for specific filesystems are given in their
438 * mount specific header files.
439 */
440 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
441 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
442 as next argument */
443
444 /*
445 * Flags for various system call interfaces.
446 *
447 * waitfor flags to vfs_sync() and getfsstat()
448 */
449 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
450 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
451 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
452 #define MNT_SUSPEND 4 /* Suspend file system after sync */
453
454 /*
455 * Generic file handle
456 */
457 struct fhandle {
458 fsid_t fh_fsid; /* Filesystem id of mount point */
459 struct fid fh_fid; /* Filesys specific id */
460 };
461 typedef struct fhandle fhandle_t;
462
463 /*
464 * Old export arguments without security flavor list
465 */
466 struct oexport_args {
467 int ex_flags; /* export related flags */
468 uid_t ex_root; /* mapping for root uid */
469 struct xucred ex_anon; /* mapping for anonymous user */
470 struct sockaddr *ex_addr; /* net address to which exported */
471 u_char ex_addrlen; /* and the net address length */
472 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
473 u_char ex_masklen; /* and the smask length */
474 char *ex_indexfile; /* index file for WebNFS URLs */
475 };
476
477 /*
478 * Export arguments for local filesystem mount calls.
479 */
480 #define MAXSECFLAVORS 5
481 struct export_args {
482 int ex_flags; /* export related flags */
483 uid_t ex_root; /* mapping for root uid */
484 struct xucred ex_anon; /* mapping for anonymous user */
485 struct sockaddr *ex_addr; /* net address to which exported */
486 u_char ex_addrlen; /* and the net address length */
487 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
488 u_char ex_masklen; /* and the smask length */
489 char *ex_indexfile; /* index file for WebNFS URLs */
490 int ex_numsecflavors; /* security flavor count */
491 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
492 };
493
494 /*
495 * Structure holding information for a publicly exported filesystem
496 * (WebNFS). Currently the specs allow just for one such filesystem.
497 */
498 struct nfs_public {
499 int np_valid; /* Do we hold valid information */
500 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
501 struct mount *np_mount; /* Mountpoint of exported fs */
502 char *np_index; /* Index file */
503 };
504
505 /*
506 * Filesystem configuration information. One of these exists for each
507 * type of filesystem supported by the kernel. These are searched at
508 * mount time to identify the requested filesystem.
509 *
510 * XXX: Never change the first two arguments!
511 */
512 struct vfsconf {
513 u_int vfc_version; /* ABI version number */
514 char vfc_name[MFSNAMELEN]; /* filesystem type name */
515 struct vfsops *vfc_vfsops; /* filesystem operations vector */
516 int vfc_typenum; /* historic filesystem type number */
517 int vfc_refcount; /* number mounted of this type */
518 int vfc_flags; /* permanent flags */
519 int vfc_prison_flag; /* prison allow.mount.* flag */
520 struct vfsoptdecl *vfc_opts; /* mount options */
521 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
522 };
523
524 /* Userland version of the struct vfsconf. */
525 struct xvfsconf {
526 struct vfsops *vfc_vfsops; /* filesystem operations vector */
527 char vfc_name[MFSNAMELEN]; /* filesystem type name */
528 int vfc_typenum; /* historic filesystem type number */
529 int vfc_refcount; /* number mounted of this type */
530 int vfc_flags; /* permanent flags */
531 struct vfsconf *vfc_next; /* next in list */
532 };
533
534 #ifndef BURN_BRIDGES
535 struct ovfsconf {
536 void *vfc_vfsops;
537 char vfc_name[32];
538 int vfc_index;
539 int vfc_refcount;
540 int vfc_flags;
541 };
542 #endif
543
544 /*
545 * NB: these flags refer to IMPLEMENTATION properties, not properties of
546 * any actual mounts; i.e., it does not make sense to change the flags.
547 */
548 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
549 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
550 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
551 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
552 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
553 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
554 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
555 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
556 #define VFCF_SBDRY 0x01000000 /* Stop at Boundary: defer stop requests
557 to kernel->user (AST) transition */
558
559 typedef uint32_t fsctlop_t;
560
561 struct vfsidctl {
562 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
563 fsid_t vc_fsid; /* fsid to operate on */
564 char vc_fstypename[MFSNAMELEN];
565 /* type of fs 'nfs' or '*' */
566 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
567 void *vc_ptr; /* pointer to data structure */
568 size_t vc_len; /* sizeof said structure */
569 u_int32_t vc_spare[12]; /* spare (must be zero) */
570 };
571
572 /* vfsidctl API version. */
573 #define VFS_CTL_VERS1 0x01
574
575 /*
576 * New style VFS sysctls, do not reuse/conflict with the namespace for
577 * private sysctls.
578 * All "global" sysctl ops have the 33rd bit set:
579 * 0x...1....
580 * Private sysctl ops should have the 33rd bit unset.
581 */
582 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
583 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
584 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
585
586 struct vfsquery {
587 u_int32_t vq_flags;
588 u_int32_t vq_spare[31];
589 };
590
591 /* vfsquery flags */
592 #define VQ_NOTRESP 0x0001 /* server down */
593 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
594 #define VQ_LOWDISK 0x0004 /* we're low on space */
595 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
596 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
597 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
598 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
599 program */
600 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
601 #define VQ_FLAG0100 0x0100 /* placeholder */
602 #define VQ_FLAG0200 0x0200 /* placeholder */
603 #define VQ_FLAG0400 0x0400 /* placeholder */
604 #define VQ_FLAG0800 0x0800 /* placeholder */
605 #define VQ_FLAG1000 0x1000 /* placeholder */
606 #define VQ_FLAG2000 0x2000 /* placeholder */
607 #define VQ_FLAG4000 0x4000 /* placeholder */
608 #define VQ_FLAG8000 0x8000 /* placeholder */
609
610 #ifdef _KERNEL
611 /* Point a sysctl request at a vfsidctl's data. */
612 #define VCTLTOREQ(vc, req) \
613 do { \
614 (req)->newptr = (vc)->vc_ptr; \
615 (req)->newlen = (vc)->vc_len; \
616 (req)->newidx = 0; \
617 } while (0)
618 #endif
619
620 struct iovec;
621 struct uio;
622
623 #ifdef _KERNEL
624
625 /*
626 * vfs_busy specific flags and mask.
627 */
628 #define MBF_NOWAIT 0x01
629 #define MBF_MNTLSTLOCK 0x02
630 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
631
632 #ifdef MALLOC_DECLARE
633 MALLOC_DECLARE(M_MOUNT);
634 MALLOC_DECLARE(M_STATFS);
635 #endif
636 extern int maxvfsconf; /* highest defined filesystem type */
637
638 TAILQ_HEAD(vfsconfhead, vfsconf);
639 extern struct vfsconfhead vfsconf;
640
641 /*
642 * Operations supported on mounted filesystem.
643 */
644 struct mount_args;
645 struct nameidata;
646 struct sysctl_req;
647 struct mntarg;
648
649 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
650 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
651 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
652 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
653 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
654 typedef int vfs_sync_t(struct mount *mp, int waitfor);
655 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
656 struct vnode **vpp);
657 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
658 int flags, struct vnode **vpp);
659 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
660 int *extflagsp, struct ucred **credanonp,
661 int *numsecflavors, int **secflavors);
662 typedef int vfs_init_t(struct vfsconf *);
663 typedef int vfs_uninit_t(struct vfsconf *);
664 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
665 struct vnode *filename_vp, int attrnamespace,
666 const char *attrname);
667 typedef int vfs_mount_t(struct mount *mp);
668 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
669 struct sysctl_req *req);
670 typedef void vfs_susp_clean_t(struct mount *mp);
671 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
672 typedef void vfs_purge_t(struct mount *mp);
673
674 struct vfsops {
675 vfs_mount_t *vfs_mount;
676 vfs_cmount_t *vfs_cmount;
677 vfs_unmount_t *vfs_unmount;
678 vfs_root_t *vfs_root;
679 vfs_quotactl_t *vfs_quotactl;
680 vfs_statfs_t *vfs_statfs;
681 vfs_sync_t *vfs_sync;
682 vfs_vget_t *vfs_vget;
683 vfs_fhtovp_t *vfs_fhtovp;
684 vfs_checkexp_t *vfs_checkexp;
685 vfs_init_t *vfs_init;
686 vfs_uninit_t *vfs_uninit;
687 vfs_extattrctl_t *vfs_extattrctl;
688 vfs_sysctl_t *vfs_sysctl;
689 vfs_susp_clean_t *vfs_susp_clean;
690 vfs_notify_lowervp_t *vfs_reclaim_lowervp;
691 vfs_notify_lowervp_t *vfs_unlink_lowervp;
692 vfs_purge_t *vfs_purge;
693 vfs_mount_t *vfs_spare[6]; /* spares for ABI compat */
694 };
695
696 vfs_statfs_t __vfs_statfs;
697
698 #define VFS_PROLOGUE(MP) do { \
699 struct mount *mp__; \
700 int _prev_stops; \
701 \
702 mp__ = (MP); \
703 _prev_stops = sigdeferstop((mp__ != NULL && \
704 (mp__->mnt_vfc->vfc_flags & VFCF_SBDRY) != 0) ? \
705 SIGDEFERSTOP_SILENT : SIGDEFERSTOP_NOP);
706
707 #define VFS_EPILOGUE(MP) \
708 sigallowstop(_prev_stops); \
709 } while (0)
710
711 #define VFS_MOUNT(MP) ({ \
712 int _rc; \
713 \
714 TSRAW(curthread, TS_ENTER, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
715 VFS_PROLOGUE(MP); \
716 _rc = (*(MP)->mnt_op->vfs_mount)(MP); \
717 VFS_EPILOGUE(MP); \
718 TSRAW(curthread, TS_EXIT, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
719 _rc; })
720
721 #define VFS_UNMOUNT(MP, FORCE) ({ \
722 int _rc; \
723 \
724 VFS_PROLOGUE(MP); \
725 _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \
726 VFS_EPILOGUE(MP); \
727 _rc; })
728
729 #define VFS_ROOT(MP, FLAGS, VPP) ({ \
730 int _rc; \
731 \
732 VFS_PROLOGUE(MP); \
733 _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \
734 VFS_EPILOGUE(MP); \
735 _rc; })
736
737 #define VFS_QUOTACTL(MP, C, U, A) ({ \
738 int _rc; \
739 \
740 VFS_PROLOGUE(MP); \
741 _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A); \
742 VFS_EPILOGUE(MP); \
743 _rc; })
744
745 #define VFS_STATFS(MP, SBP) ({ \
746 int _rc; \
747 \
748 VFS_PROLOGUE(MP); \
749 _rc = __vfs_statfs((MP), (SBP)); \
750 VFS_EPILOGUE(MP); \
751 _rc; })
752
753 #define VFS_SYNC(MP, WAIT) ({ \
754 int _rc; \
755 \
756 VFS_PROLOGUE(MP); \
757 _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \
758 VFS_EPILOGUE(MP); \
759 _rc; })
760
761 #define VFS_VGET(MP, INO, FLAGS, VPP) ({ \
762 int _rc; \
763 \
764 VFS_PROLOGUE(MP); \
765 _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \
766 VFS_EPILOGUE(MP); \
767 _rc; })
768
769 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({ \
770 int _rc; \
771 \
772 VFS_PROLOGUE(MP); \
773 _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP); \
774 VFS_EPILOGUE(MP); \
775 _rc; })
776
777 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \
778 int _rc; \
779 \
780 VFS_PROLOGUE(MP); \
781 _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
782 SEC); \
783 VFS_EPILOGUE(MP); \
784 _rc; })
785
786 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \
787 int _rc; \
788 \
789 VFS_PROLOGUE(MP); \
790 _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \
791 VFS_EPILOGUE(MP); \
792 _rc; })
793
794 #define VFS_SYSCTL(MP, OP, REQ) ({ \
795 int _rc; \
796 \
797 VFS_PROLOGUE(MP); \
798 _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \
799 VFS_EPILOGUE(MP); \
800 _rc; })
801
802 #define VFS_SUSP_CLEAN(MP) do { \
803 if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \
804 VFS_PROLOGUE(MP); \
805 (*(MP)->mnt_op->vfs_susp_clean)(MP); \
806 VFS_EPILOGUE(MP); \
807 } \
808 } while (0)
809
810 #define VFS_RECLAIM_LOWERVP(MP, VP) do { \
811 if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \
812 VFS_PROLOGUE(MP); \
813 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \
814 VFS_EPILOGUE(MP); \
815 } \
816 } while (0)
817
818 #define VFS_UNLINK_LOWERVP(MP, VP) do { \
819 if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) { \
820 VFS_PROLOGUE(MP); \
821 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP)); \
822 VFS_EPILOGUE(MP); \
823 } \
824 } while (0)
825
826 #define VFS_PURGE(MP) do { \
827 if (*(MP)->mnt_op->vfs_purge != NULL) { \
828 VFS_PROLOGUE(MP); \
829 (*(MP)->mnt_op->vfs_purge)(MP); \
830 VFS_EPILOGUE(MP); \
831 } \
832 } while (0)
833
834 #define VFS_KNOTE_LOCKED(vp, hint) do \
835 { \
836 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
837 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
838 } while (0)
839
840 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
841 { \
842 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
843 VN_KNOTE((vp), (hint), 0); \
844 } while (0)
845
846 #define VFS_NOTIFY_UPPER_RECLAIM 1
847 #define VFS_NOTIFY_UPPER_UNLINK 2
848
849 #include <sys/module.h>
850
851 /*
852 * Version numbers.
853 */
854 #define VFS_VERSION_00 0x19660120
855 #define VFS_VERSION_01 0x20121030
856 #define VFS_VERSION_02 0x20180504
857 #define VFS_VERSION VFS_VERSION_02
858
859 #define VFS_SET(vfsops, fsname, flags) \
860 static struct vfsconf fsname ## _vfsconf = { \
861 .vfc_version = VFS_VERSION, \
862 .vfc_name = #fsname, \
863 .vfc_vfsops = &vfsops, \
864 .vfc_typenum = -1, \
865 .vfc_flags = flags, \
866 }; \
867 static moduledata_t fsname ## _mod = { \
868 #fsname, \
869 vfs_modevent, \
870 & fsname ## _vfsconf \
871 }; \
872 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
873
874 /*
875 * exported vnode operations
876 */
877
878 int dounmount(struct mount *, int, struct thread *);
879
880 int kernel_mount(struct mntarg *ma, uint64_t flags);
881 int kernel_vmount(int flags, ...);
882 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
883 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
884 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
885 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
886 void statfs_scale_blocks(struct statfs *sf, long max_size);
887 struct vfsconf *vfs_byname(const char *);
888 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
889 void vfs_mount_destroy(struct mount *);
890 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
891 void vfs_freeopts(struct vfsoptlist *opts);
892 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
893 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
894 int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
895 uint64_t val);
896 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
897 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
898 int vfs_getopt_size(struct vfsoptlist *opts, const char *name,
899 off_t *value);
900 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
901 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
902 int vfs_filteropt(struct vfsoptlist *, const char **legal);
903 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
904 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
905 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
906 int len);
907 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
908 int len);
909 int vfs_setopts(struct vfsoptlist *opts, const char *name,
910 const char *value);
911 int vfs_setpublicfs /* set publicly exported fs */
912 (struct mount *, struct netexport *, struct export_args *);
913 void vfs_msync(struct mount *, int);
914 int vfs_busy(struct mount *, int);
915 int vfs_export /* process mount export info */
916 (struct mount *, struct export_args *);
917 void vfs_allocate_syncvnode(struct mount *);
918 void vfs_deallocate_syncvnode(struct mount *);
919 int vfs_donmount(struct thread *td, uint64_t fsflags,
920 struct uio *fsoptions);
921 void vfs_getnewfsid(struct mount *);
922 struct cdev *vfs_getrootfsid(struct mount *);
923 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
924 struct mount *vfs_busyfs(fsid_t *);
925 int vfs_modevent(module_t, int, void *);
926 void vfs_mount_error(struct mount *, const char *, ...);
927 void vfs_mountroot(void); /* mount our root filesystem */
928 void vfs_mountedfrom(struct mount *, const char *from);
929 void vfs_notify_upper(struct vnode *, int);
930 void vfs_oexport_conv(const struct oexport_args *oexp,
931 struct export_args *exp);
932 void vfs_ref(struct mount *);
933 void vfs_rel(struct mount *);
934 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
935 struct ucred *);
936 int vfs_suser(struct mount *, struct thread *);
937 void vfs_unbusy(struct mount *);
938 void vfs_unmountall(void);
939 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
940 extern struct mtx mountlist_mtx;
941 extern struct nfs_public nfs_pub;
942 extern struct sx vfsconf_sx;
943 #define vfsconf_lock() sx_xlock(&vfsconf_sx)
944 #define vfsconf_unlock() sx_xunlock(&vfsconf_sx)
945 #define vfsconf_slock() sx_slock(&vfsconf_sx)
946 #define vfsconf_sunlock() sx_sunlock(&vfsconf_sx)
947
948 /*
949 * Declarations for these vfs default operations are located in
950 * kern/vfs_default.c. They will be automatically used to replace
951 * null entries in VFS ops tables when registering a new filesystem
952 * type in the global table.
953 */
954 vfs_root_t vfs_stdroot;
955 vfs_quotactl_t vfs_stdquotactl;
956 vfs_statfs_t vfs_stdstatfs;
957 vfs_sync_t vfs_stdsync;
958 vfs_sync_t vfs_stdnosync;
959 vfs_vget_t vfs_stdvget;
960 vfs_fhtovp_t vfs_stdfhtovp;
961 vfs_checkexp_t vfs_stdcheckexp;
962 vfs_init_t vfs_stdinit;
963 vfs_uninit_t vfs_stduninit;
964 vfs_extattrctl_t vfs_stdextattrctl;
965 vfs_sysctl_t vfs_stdsysctl;
966
967 void syncer_suspend(void);
968 void syncer_resume(void);
969
970 #else /* !_KERNEL */
971
972 #include <sys/cdefs.h>
973
974 struct stat;
975
976 __BEGIN_DECLS
977 int fhlink(struct fhandle *, const char *);
978 int fhlinkat(struct fhandle *, int, const char *);
979 int fhopen(const struct fhandle *, int);
980 int fhreadlink(struct fhandle *, char *, size_t);
981 int fhstat(const struct fhandle *, struct stat *);
982 int fhstatfs(const struct fhandle *, struct statfs *);
983 int fstatfs(int, struct statfs *);
984 int getfh(const char *, fhandle_t *);
985 int getfhat(int, char *, struct fhandle *, int);
986 int getfsstat(struct statfs *, long, int);
987 int getmntinfo(struct statfs **, int);
988 int lgetfh(const char *, fhandle_t *);
989 int mount(const char *, const char *, int, void *);
990 int nmount(struct iovec *, unsigned int, int);
991 int statfs(const char *, struct statfs *);
992 int unmount(const char *, int);
993
994 /* C library stuff */
995 int getvfsbyname(const char *, struct xvfsconf *);
996 __END_DECLS
997
998 #endif /* _KERNEL */
999
1000 #endif /* !_SYS_MOUNT_H_ */
1001