2 * Copyright (c) 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)mount.h 8.21 (Berkeley) 5/20/95
40 #include <sys/ucred.h>
41 #include <sys/queue.h>
43 #include <sys/lockmgr.h>
44 #include <sys/_label.h>
45 #include <sys/_lock.h>
46 #include <sys/_mutex.h>
49 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
53 * These are unique per filesystem on a single machine.
58 u_short fid_len; /* length of data in bytes */
59 u_short fid_reserved; /* force longword alignment */
60 char fid_data[MAXFIDSZ]; /* data (variable length) */
64 * filesystem statistics
67 #define MFSNAMELEN 16 /* length of fs type name, including null */
68 #define MNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
70 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
71 /* XXX statfs.2 is out of date with read counter changes here. */
73 long f_spare2; /* placeholder */
74 long f_bsize; /* fundamental filesystem block size */
75 long f_iosize; /* optimal transfer block size */
76 long f_blocks; /* total data blocks in filesystem */
77 long f_bfree; /* free blocks in fs */
78 long f_bavail; /* free blocks avail to non-superuser */
79 long f_files; /* total file nodes in filesystem */
80 long f_ffree; /* free file nodes in fs */
81 fsid_t f_fsid; /* filesystem id */
82 uid_t f_owner; /* user that mounted the filesystem */
83 int f_type; /* type of filesystem */
84 int f_flags; /* copy of mount exported flags */
85 long f_syncwrites; /* count of sync writes since mount */
86 long f_asyncwrites; /* count of async writes since mount */
87 char f_fstypename[MFSNAMELEN]; /* fs type name */
88 char f_mntonname[MNAMELEN]; /* directory on which mounted */
89 long f_syncreads; /* count of sync reads since mount */
90 long f_asyncreads; /* count of async reads since mount */
91 short f_spares1; /* unused spare */
92 char f_mntfromname[MNAMELEN];/* mounted filesystem */
93 short f_spares2; /* unused spare */
95 * XXX on machines where longs are aligned to 8-byte boundaries, there
96 * is an unnamed int32_t here. This spare was after the apparent end
97 * of the struct until we bit off the read counters from f_mntonname.
99 long f_spare[2]; /* unused spare */
103 #define MMAXOPTIONLEN 65536 /* maximum length of a mount option */
105 TAILQ_HEAD(vnodelst, vnode);
106 TAILQ_HEAD(vfsoptlist, vfsopt);
108 TAILQ_ENTRY(vfsopt) link;
115 * Structure per mounted filesystem. Each mounted filesystem has an
116 * array of operations and an instance record. The filesystems are
117 * put on a doubly linked list.
119 * NOTE: mnt_nvnodelist and mnt_reservedvnlist. At the moment vnodes
120 * are linked into mnt_nvnodelist. At some point in the near future the
121 * vnode list will be split into a 'dirty' and 'clean' list. mnt_nvnodelist
122 * will become the dirty list and mnt_reservedvnlist will become the 'clean'
123 * list. Filesystem kld's syncing code should remain compatible since
124 * they only need to scan the dirty vnode list (nvnodelist -> dirtyvnodelist).
127 TAILQ_ENTRY(mount) mnt_list; /* mount list */
128 struct vfsops *mnt_op; /* operations on fs */
129 struct vfsconf *mnt_vfc; /* configuration info */
130 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
131 struct vnode *mnt_syncer; /* syncer vnode */
132 struct vnodelst mnt_nvnodelist; /* list of vnodes this mount */
133 struct vnodelst mnt_reservedvnlist; /* (future) dirty vnode list */
134 struct lock mnt_lock; /* mount structure lock */
135 int mnt_writeopcount; /* write syscalls in progress */
136 int mnt_flag; /* flags shared with user */
137 struct vfsoptlist *mnt_opt; /* current mount options */
138 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
139 int mnt_kern_flag; /* kernel only flags */
140 int mnt_maxsymlinklen; /* max size of short symlink */
141 struct statfs mnt_stat; /* cache of filesystem stats */
142 struct ucred *mnt_cred; /* credentials of mounter */
143 qaddr_t mnt_data; /* private data */
144 time_t mnt_time; /* last time written*/
145 int mnt_iosize_max; /* max size for clusters, etc */
146 struct netexport *mnt_export; /* export list */
147 struct label mnt_mntlabel; /* MAC label for the mount */
148 struct label mnt_fslabel; /* MAC label for the fs */
149 int mnt_nvnodelistsize; /* # of vnodes on this mount */
154 * User specifiable flags.
156 #define MNT_RDONLY 0x00000001 /* read only filesystem */
157 #define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */
158 #define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */
159 #define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */
160 #define MNT_NODEV 0x00000010 /* don't interpret special files */
161 #define MNT_UNION 0x00000020 /* union with underlying filesystem */
162 #define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */
163 #define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */
164 #define MNT_SOFTDEP 0x00200000 /* soft updates being done */
165 #define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */
166 #define MNT_JAILDEVFS 0x02000000 /* jail-friendly DEVFS behaviour */
167 #define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */
168 #define MNT_ACLS 0x08000000 /* ACL support enabled */
169 #define MNT_NOATIME 0x10000000 /* disable update of file access time */
170 #define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */
171 #define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */
174 * NFS export related mount flags.
176 #define MNT_EXRDONLY 0x00000080 /* exported read only */
177 #define MNT_EXPORTED 0x00000100 /* filesystem is exported */
178 #define MNT_DEFEXPORTED 0x00000200 /* exported to the world */
179 #define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */
180 #define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */
181 #define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */
184 * Flags set by internal operations,
185 * but visible to the user.
186 * XXX some of these are not quite right.. (I've never seen the root flag set)
188 #define MNT_LOCAL 0x00001000 /* filesystem is stored locally */
189 #define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */
190 #define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */
191 #define MNT_USER 0x00008000 /* mounted by a user */
192 #define MNT_IGNORE 0x00800000 /* do not show entry in df */
195 * Mask of flags that are visible to statfs().
196 * XXX I think that this could now become (~(MNT_CMDFLAGS))
197 * but the 'mount' program may need changing to handle this.
199 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
200 MNT_NOSUID | MNT_NODEV | MNT_UNION | \
201 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
202 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
203 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
204 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
205 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
206 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
207 MNT_JAILDEVFS | MNT_MULTILABEL | MNT_ACLS)
209 /* Mask of flags that can be updated. */
210 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | \
211 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
213 MNT_NOSYMFOLLOW | MNT_IGNORE | MNT_JAILDEVFS | \
214 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
218 * External filesystem command modifier flags.
219 * Unmount can use the MNT_FORCE flag.
220 * XXX These are not STATES and really should be somewhere else.
222 #define MNT_UPDATE 0x00010000 /* not a real mount, just an update */
223 #define MNT_DELEXPORT 0x00020000 /* delete export host lists */
224 #define MNT_RELOAD 0x00040000 /* reload filesystem data */
225 #define MNT_FORCE 0x00080000 /* force unmount or readonly change */
226 #define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */
227 #define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */
228 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
229 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
231 * Internal filesystem control flags stored in mnt_kern_flag.
233 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
234 * past the mount point. This keeps the subtree stable during mounts
237 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
238 * dounmount() is still waiting to lock the mountpoint. This allows
239 * the filesystem to cancel operations that might otherwise deadlock
240 * with the unmount attempt (used by NFS).
242 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
243 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
244 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
245 #define MNTK_WANTRDWR 0x04000000 /* upgrade to read/write requested */
246 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
247 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
250 * Sysctl CTL_VFS definitions.
252 * Second level identifier specifies which filesystem. Second level
253 * identifier VFS_VFSCONF returns information about all filesystems.
254 * Second level identifier VFS_GENERIC is non-terminal.
256 #define VFS_VFSCONF 0 /* get configured filesystems */
257 #define VFS_GENERIC 0 /* generic filesystem information */
259 * Third level identifiers for VFS_GENERIC are given below; third
260 * level identifiers for specific filesystems are given in their
261 * mount specific header files.
263 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
264 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
268 * Flags for various system call interfaces.
270 * waitfor flags to vfs_sync() and getfsstat()
272 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
273 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
274 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
277 * Generic file handle
280 fsid_t fh_fsid; /* Filesystem id of mount point */
281 struct fid fh_fid; /* Filesys specific id */
283 typedef struct fhandle fhandle_t;
286 * Export arguments for local filesystem mount calls.
289 int ex_flags; /* export related flags */
290 uid_t ex_root; /* mapping for root uid */
291 struct xucred ex_anon; /* mapping for anonymous user */
292 struct sockaddr *ex_addr; /* net address to which exported */
293 u_char ex_addrlen; /* and the net address length */
294 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
295 u_char ex_masklen; /* and the smask length */
296 char *ex_indexfile; /* index file for WebNFS URLs */
300 * Structure holding information for a publicly exported filesystem
301 * (WebNFS). Currently the specs allow just for one such filesystem.
304 int np_valid; /* Do we hold valid information */
305 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
306 struct mount *np_mount; /* Mountpoint of exported fs */
307 char *np_index; /* Index file */
311 * Filesystem configuration information. One of these exists for each
312 * type of filesystem supported by the kernel. These are searched at
313 * mount time to identify the requested filesystem.
316 struct vfsops *vfc_vfsops; /* filesystem operations vector */
317 char vfc_name[MFSNAMELEN]; /* filesystem type name */
318 int vfc_typenum; /* historic filesystem type number */
319 int vfc_refcount; /* number mounted of this type */
320 int vfc_flags; /* permanent flags */
321 struct vfsoptdecl *vfc_opts; /* mount options */
322 struct vfsconf *vfc_next; /* next in list */
325 /* Userland version of the struct vfsconf. */
327 struct vfsops *vfc_vfsops; /* filesystem operations vector */
328 char vfc_name[MFSNAMELEN]; /* filesystem type name */
329 int vfc_typenum; /* historic filesystem type number */
330 int vfc_refcount; /* number mounted of this type */
331 int vfc_flags; /* permanent flags */
332 struct vfsconf *vfc_next; /* next in list */
344 * NB: these flags refer to IMPLEMENTATION properties, not properties of
345 * any actual mounts; i.e., it does not make sense to change the flags.
347 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
348 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
349 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
350 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
351 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
352 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/
359 #ifdef MALLOC_DECLARE
360 MALLOC_DECLARE(M_MOUNT);
362 extern int maxvfsconf; /* highest defined filesystem type */
363 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
364 extern struct vfsconf *vfsconf; /* head of list of filesystem types */
367 * Operations supported on mounted filesystem.
372 typedef int vfs_mount_t(struct mount *mp, char *path, caddr_t data,
373 struct nameidata *ndp, struct thread *td);
374 typedef int vfs_start_t(struct mount *mp, int flags, struct thread *td);
375 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
376 typedef int vfs_root_t(struct mount *mp, struct vnode **vpp);
377 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
378 caddr_t arg, struct thread *td);
379 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
381 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct ucred *cred,
383 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
385 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
386 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
387 int *extflagsp, struct ucred **credanonp);
388 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
389 typedef int vfs_init_t(struct vfsconf *);
390 typedef int vfs_uninit_t(struct vfsconf *);
391 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
392 struct vnode *filename_vp, int attrnamespace,
393 const char *attrname, struct thread *td);
394 typedef int vfs_nmount_t(struct mount *mp, struct nameidata *ndp,
398 vfs_mount_t *vfs_mount;
399 vfs_start_t *vfs_start;
400 vfs_unmount_t *vfs_unmount;
401 vfs_root_t *vfs_root;
402 vfs_quotactl_t *vfs_quotactl;
403 vfs_statfs_t *vfs_statfs;
404 vfs_sync_t *vfs_sync;
405 vfs_vget_t *vfs_vget;
406 vfs_fhtovp_t *vfs_fhtovp;
407 vfs_checkexp_t *vfs_checkexp;
408 vfs_vptofh_t *vfs_vptofh;
409 vfs_init_t *vfs_init;
410 vfs_uninit_t *vfs_uninit;
411 vfs_extattrctl_t *vfs_extattrctl;
412 /* Additions below are not binary compatible with 5.0 and below. */
413 vfs_nmount_t *vfs_nmount;
416 #define VFS_NMOUNT(MP, NDP, P) (*(MP)->mnt_op->vfs_nmount)(MP, NDP, P)
417 #define VFS_MOUNT(MP, PATH, DATA, NDP, P) \
418 (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P)
419 #define VFS_START(MP, FLAGS, P) (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
420 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
421 #define VFS_ROOT(MP, VPP) (*(MP)->mnt_op->vfs_root)(MP, VPP)
422 #define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
423 #define VFS_STATFS(MP, SBP, P) (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
424 #define VFS_SYNC(MP, WAIT, C, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, C, P)
425 #define VFS_VGET(MP, INO, FLAGS, VPP) \
426 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
427 #define VFS_FHTOVP(MP, FIDP, VPP) \
428 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
429 #define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
430 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
431 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
432 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
433 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
435 #include <sys/module.h>
437 #define VFS_SET(vfsops, fsname, flags) \
438 static struct vfsconf fsname ## _vfsconf = { \
445 static moduledata_t fsname ## _mod = { \
448 & fsname ## _vfsconf \
450 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
452 extern char *mountrootfsname;
455 * exported vnode operations
457 int dounmount(struct mount *, int, struct thread *td);
458 int kernel_mount(struct iovec *iovp, unsigned int iovcnt, int flags);
459 int kernel_vmount(int flags, ...);
460 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
461 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
462 int vfs_mount(struct thread *td, const char *type, char *path,
463 int flags, void *data);
464 int vfs_setpublicfs /* set publicly exported fs */
465 (struct mount *, struct netexport *, struct export_args *);
466 int vfs_lock(struct mount *); /* lock a vfs */
467 void vfs_msync(struct mount *, int);
468 void vfs_unlock(struct mount *); /* unlock a vfs */
469 int vfs_busy(struct mount *, int, struct mtx *, struct thread *td);
470 int vfs_export /* process mount export info */
471 (struct mount *, struct export_args *);
472 struct netcred *vfs_export_lookup /* lookup host in fs export list */
473 (struct mount *, struct sockaddr *);
474 int vfs_allocate_syncvnode(struct mount *);
475 void vfs_getnewfsid(struct mount *);
476 dev_t vfs_getrootfsid(struct mount *);
477 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
478 int vfs_modevent(module_t, int, void *);
479 int vfs_mountedon(struct vnode *); /* is a vfs mounted on vp */
480 void vfs_mountroot(void); /* mount our root filesystem */
481 int vfs_rootmountalloc(char *, char *, struct mount **);
482 void vfs_unbusy(struct mount *, struct thread *td);
483 void vfs_unmountall(void);
484 int vfs_register(struct vfsconf *);
485 int vfs_unregister(struct vfsconf *);
486 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
487 extern struct mtx mountlist_mtx;
488 extern struct nfs_public nfs_pub;
491 * Declarations for these vfs default operations are located in
492 * kern/vfs_default.c, they should be used instead of making "dummy"
493 * functions or casting entries in the VFS op table to "enopnotsupp()".
495 vfs_start_t vfs_stdstart;
496 vfs_root_t vfs_stdroot;
497 vfs_quotactl_t vfs_stdquotactl;
498 vfs_statfs_t vfs_stdstatfs;
499 vfs_sync_t vfs_stdsync;
500 vfs_sync_t vfs_stdnosync;
501 vfs_vget_t vfs_stdvget;
502 vfs_fhtovp_t vfs_stdfhtovp;
503 vfs_checkexp_t vfs_stdcheckexp;
504 vfs_vptofh_t vfs_stdvptofh;
505 vfs_init_t vfs_stdinit;
506 vfs_uninit_t vfs_stduninit;
507 vfs_extattrctl_t vfs_stdextattrctl;
509 /* XXX - these should be indirect functions!!! */
510 int softdep_fsync(struct vnode *);
511 int softdep_process_worklist(struct mount *);
515 #include <sys/cdefs.h>
520 int fhopen(const struct fhandle *, int);
521 int fhstat(const struct fhandle *, struct stat *);
522 int fhstatfs(const struct fhandle *, struct statfs *);
523 int fstatfs(int, struct statfs *);
524 int getfh(const char *, fhandle_t *);
525 int getfsstat(struct statfs *, long, int);
526 int getmntinfo(struct statfs **, int);
527 int mount(const char *, const char *, int, void *);
528 int nmount(struct iovec *, u_int, int);
529 int statfs(const char *, struct statfs *);
530 int unmount(const char *, int);
532 /* C library stuff */
533 void endvfsent(void);
534 struct ovfsconf *getvfsbytype(int);
535 struct ovfsconf *getvfsent(void);
536 int getvfsbyname(const char *, struct xvfsconf *);
538 int vfsisloadable(const char *);
539 int vfsload(const char *);
544 #endif /* !_SYS_MOUNT_H_ */