Linux needs %edx to be 0 on entry. It registers it as an atexit function if
[dragonfly.git] / sys / sys / mount.h
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1/*
2 * Copyright (c) 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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
31 * SUCH DAMAGE.
32 *
33 * @(#)mount.h 8.21 (Berkeley) 5/20/95
34 * $FreeBSD: src/sys/sys/mount.h,v 1.89.2.7 2003/04/04 20:35:57 tegge Exp $
8a8d5d85 35 * $DragonFly: src/sys/sys/mount.h,v 1.5 2003/07/06 21:23:54 dillon Exp $
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36 */
37
38#ifndef _SYS_MOUNT_H_
39#define _SYS_MOUNT_H_
40
41#include <sys/ucred.h>
42
43#ifndef _KERNEL
44#if !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)
45#include <sys/stat.h>
46#endif /* !_POSIX_C_SOURCE */
47#endif /* !_KERNEL */
48
49#include <sys/queue.h>
50#ifdef _KERNEL
51#include <sys/lock.h>
52#endif
53
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54struct thread;
55
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56typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
57
58/*
59 * File identifier.
60 * These are unique per filesystem on a single machine.
61 */
62#define MAXFIDSZ 16
63
64struct fid {
65 u_short fid_len; /* length of data in bytes */
66 u_short fid_reserved; /* force longword alignment */
67 char fid_data[MAXFIDSZ]; /* data (variable length) */
68};
69
70/*
71 * file system statistics
72 */
73
74#define MFSNAMELEN 16 /* length of fs type name, including null */
75#ifdef __i386__
76#define MNAMELEN 80 /* length of buffer for returned name */
77#endif
78#ifdef __alpha__
79#define MNAMELEN 72 /* length of buffer for returned name */
80#endif
81
82struct statfs {
83 long f_spare2; /* placeholder */
84 long f_bsize; /* fundamental file system block size */
85 long f_iosize; /* optimal transfer block size */
86 long f_blocks; /* total data blocks in file system */
87 long f_bfree; /* free blocks in fs */
88 long f_bavail; /* free blocks avail to non-superuser */
89 long f_files; /* total file nodes in file system */
90 long f_ffree; /* free file nodes in fs */
91 fsid_t f_fsid; /* file system id */
92 uid_t f_owner; /* user that mounted the filesystem */
93 int f_type; /* type of filesystem */
94 int f_flags; /* copy of mount exported flags */
95 long f_syncwrites; /* count of sync writes since mount */
96 long f_asyncwrites; /* count of async writes since mount */
97 char f_fstypename[MFSNAMELEN]; /* fs type name */
98 char f_mntonname[MNAMELEN]; /* directory on which mounted */
99 long f_syncreads; /* count of sync reads since mount */
100 long f_asyncreads; /* count of async reads since mount */
101 short f_spares1; /* unused spare */
102 char f_mntfromname[MNAMELEN];/* mounted filesystem */
103 short f_spares2; /* unused spare */
104 long f_spare[2]; /* unused spare */
105};
106
107#ifdef _KERNEL
108/*
109 * Structure per mounted file system. Each mounted file system has an
110 * array of operations and an instance record. The file systems are
111 * put on a doubly linked list.
112 *
113 * NOTE: mnt_nvnodelist and mnt_reservedvnlist. At the moment vnodes
114 * are linked into mnt_nvnodelist. At some point in the near future the
115 * vnode list will be split into a 'dirty' and 'clean' list. mnt_nvnodelist
116 * will become the dirty list and mnt_reservedvnlist will become the 'clean'
117 * list. Filesystem kld's syncing code should remain compatible since
118 * they only need to scan the dirty vnode list (nvnodelist -> dirtyvnodelist).
119 */
120TAILQ_HEAD(vnodelst, vnode);
121
122struct mount {
123 TAILQ_ENTRY(mount) mnt_list; /* mount list */
124 struct vfsops *mnt_op; /* operations on fs */
125 struct vfsconf *mnt_vfc; /* configuration info */
126 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
127 struct vnode *mnt_syncer; /* syncer vnode */
128 struct vnodelst mnt_nvnodelist; /* list of vnodes this mount */
129 struct lock mnt_lock; /* mount structure lock */
130 int mnt_flag; /* flags shared with user */
131 int mnt_kern_flag; /* kernel only flags */
132 int mnt_maxsymlinklen; /* max size of short symlink */
133 struct statfs mnt_stat; /* cache of filesystem stats */
134 qaddr_t mnt_data; /* private data */
135 time_t mnt_time; /* last time written*/
136 u_int mnt_iosize_max; /* max IO request size */
137 struct vnodelst mnt_reservedvnlist; /* (future) dirty vnode list */
138 int mnt_nvnodelistsize; /* # of vnodes on this mount */
139};
140#endif /* _KERNEL */
141
142/*
143 * User specifiable flags.
144 */
145#define MNT_RDONLY 0x00000001 /* read only filesystem */
146#define MNT_SYNCHRONOUS 0x00000002 /* file system written synchronously */
147#define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */
148#define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */
149#define MNT_NODEV 0x00000010 /* don't interpret special files */
150#define MNT_UNION 0x00000020 /* union with underlying filesystem */
151#define MNT_ASYNC 0x00000040 /* file system written asynchronously */
152#define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */
153#define MNT_SOFTDEP 0x00200000 /* soft updates being done */
154#define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */
155#define MNT_NOATIME 0x10000000 /* disable update of file access time */
156#define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */
157#define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */
158
159/*
160 * NFS export related mount flags.
161 */
162#define MNT_EXRDONLY 0x00000080 /* exported read only */
163#define MNT_EXPORTED 0x00000100 /* file system is exported */
164#define MNT_DEFEXPORTED 0x00000200 /* exported to the world */
165#define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */
166#define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */
167#define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */
168
169/*
170 * Flags set by internal operations,
171 * but visible to the user.
172 * XXX some of these are not quite right.. (I've never seen the root flag set)
173 */
174#define MNT_LOCAL 0x00001000 /* filesystem is stored locally */
175#define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */
176#define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */
177#define MNT_USER 0x00008000 /* mounted by a user */
178#define MNT_IGNORE 0x00800000 /* do not show entry in df */
179
180/*
181 * Mask of flags that are visible to statfs()
182 * XXX I think that this could now become (~(MNT_CMDFLAGS))
183 * but the 'mount' program may need changing to handle this.
184 */
185#define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
186 MNT_NOSUID | MNT_NODEV | MNT_UNION | \
187 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
188 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
189 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
190 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
191 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
192 MNT_IGNORE | MNT_NOSYMFOLLOW | MNT_EXPUBLIC )
193/*
194 * External filesystem command modifier flags.
195 * Unmount can use the MNT_FORCE flag.
196 * XXX These are not STATES and really should be somewhere else.
197 */
198#define MNT_UPDATE 0x00010000 /* not a real mount, just an update */
199#define MNT_DELEXPORT 0x00020000 /* delete export host lists */
200#define MNT_RELOAD 0x00040000 /* reload filesystem data */
201#define MNT_FORCE 0x00080000 /* force unmount or readonly change */
202#define MNT_CMDFLAGS (MNT_UPDATE|MNT_DELEXPORT|MNT_RELOAD|MNT_FORCE)
203/*
204 * Internal filesystem control flags stored in mnt_kern_flag.
205 *
206 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
207 * past the mount point. This keeps the subtree stable during mounts
208 * and unmounts.
209 *
210 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
211 * dounmount() is still waiting to lock the mountpoint. This allows
212 * the filesystem to cancel operations that might otherwise deadlock
213 * with the unmount attempt (used by NFS).
214 */
215#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
216#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
217#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
218#define MNTK_WANTRDWR 0x04000000 /* upgrade to read/write requested */
219
220/*
221 * Sysctl CTL_VFS definitions.
222 *
223 * Second level identifier specifies which filesystem. Second level
224 * identifier VFS_VFSCONF returns information about all filesystems.
225 * Second level identifier VFS_GENERIC is non-terminal.
226 */
227#define VFS_VFSCONF 0 /* get configured filesystems */
228#define VFS_GENERIC 0 /* generic filesystem information */
229/*
230 * Third level identifiers for VFS_GENERIC are given below; third
231 * level identifiers for specific filesystems are given in their
232 * mount specific header files.
233 */
234#define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
235#define VFS_CONF 2 /* struct: vfsconf for filesystem given
236 as next argument */
237
238/*
239 * Flags for various system call interfaces.
240 *
241 * waitfor flags to vfs_sync() and getfsstat()
242 */
243#define MNT_WAIT 1 /* synchronously wait for I/O to complete */
244#define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
245#define MNT_LAZY 3 /* push data not written by filesystem syncer */
246
247/*
248 * Generic file handle
249 */
250struct fhandle {
251 fsid_t fh_fsid; /* File system id of mount point */
252 struct fid fh_fid; /* File sys specific id */
253};
254typedef struct fhandle fhandle_t;
255
256/*
257 * Export arguments for local filesystem mount calls.
258 */
259struct export_args {
260 int ex_flags; /* export related flags */
261 uid_t ex_root; /* mapping for root uid */
262 struct ucred ex_anon; /* mapping for anonymous user */
263 struct sockaddr *ex_addr; /* net address to which exported */
264 int ex_addrlen; /* and the net address length */
265 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
266 int ex_masklen; /* and the smask length */
267 char *ex_indexfile; /* index file for WebNFS URLs */
268};
269
270/*
271 * Structure holding information for a publicly exported filesystem
272 * (WebNFS). Currently the specs allow just for one such filesystem.
273 */
274struct nfs_public {
275 int np_valid; /* Do we hold valid information */
276 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
277 struct mount *np_mount; /* Mountpoint of exported fs */
278 char *np_index; /* Index file */
279};
280
281/*
282 * Filesystem configuration information. One of these exists for each
283 * type of filesystem supported by the kernel. These are searched at
284 * mount time to identify the requested filesystem.
285 */
286struct vfsconf {
287 struct vfsops *vfc_vfsops; /* filesystem operations vector */
288 char vfc_name[MFSNAMELEN]; /* filesystem type name */
289 int vfc_typenum; /* historic filesystem type number */
290 int vfc_refcount; /* number mounted of this type */
291 int vfc_flags; /* permanent flags */
292 struct vfsconf *vfc_next; /* next in list */
293};
294
295struct ovfsconf {
296 void *vfc_vfsops;
297 char vfc_name[32];
298 int vfc_index;
299 int vfc_refcount;
300 int vfc_flags;
301};
302
303/*
304 * NB: these flags refer to IMPLEMENTATION properties, not properties of
305 * any actual mounts; i.e., it does not make sense to change the flags.
306 */
307#define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
308#define VFCF_NETWORK 0x00020000 /* may get data over the network */
309#define VFCF_READONLY 0x00040000 /* writes are not implemented */
310#define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
311#define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
312#define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/
313
314#ifdef _KERNEL
315
316#ifdef MALLOC_DECLARE
317MALLOC_DECLARE(M_MOUNT);
318#endif
319extern int maxvfsconf; /* highest defined filesystem type */
320extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
321extern struct vfsconf *vfsconf; /* head of list of filesystem types */
322
323/*
324 * Operations supported on mounted file system.
325 */
326#ifdef __STDC__
327struct nameidata;
328struct mbuf;
329#endif
330
331struct vfsops {
332 int (*vfs_mount) __P((struct mount *mp, char *path, caddr_t data,
dadab5e9 333 struct nameidata *ndp, struct thread *td));
984263bc 334 int (*vfs_start) __P((struct mount *mp, int flags,
dadab5e9 335 struct thread *td));
984263bc 336 int (*vfs_unmount) __P((struct mount *mp, int mntflags,
dadab5e9 337 struct thread *td));
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338 int (*vfs_root) __P((struct mount *mp, struct vnode **vpp));
339 int (*vfs_quotactl) __P((struct mount *mp, int cmds, uid_t uid,
dadab5e9 340 caddr_t arg, struct thread *td));
984263bc 341 int (*vfs_statfs) __P((struct mount *mp, struct statfs *sbp,
dadab5e9 342 struct thread *td));
984263bc 343 int (*vfs_sync) __P((struct mount *mp, int waitfor,
3b568787 344 struct thread *td));
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345 int (*vfs_vget) __P((struct mount *mp, ino_t ino,
346 struct vnode **vpp));
347 int (*vfs_fhtovp) __P((struct mount *mp, struct fid *fhp,
348 struct vnode **vpp));
349 int (*vfs_checkexp) __P((struct mount *mp, struct sockaddr *nam,
350 int *extflagsp, struct ucred **credanonp));
351 int (*vfs_vptofh) __P((struct vnode *vp, struct fid *fhp));
352 int (*vfs_init) __P((struct vfsconf *));
353 int (*vfs_uninit) __P((struct vfsconf *));
354 int (*vfs_extattrctl) __P((struct mount *mp, int cmd,
355 const char *attrname, caddr_t arg,
dadab5e9 356 struct thread *td));
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357};
358
359#define VFS_MOUNT(MP, PATH, DATA, NDP, P) \
360 (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P)
361#define VFS_START(MP, FLAGS, P) (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
362#define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
363#define VFS_ROOT(MP, VPP) (*(MP)->mnt_op->vfs_root)(MP, VPP)
364#define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
365#define VFS_STATFS(MP, SBP, P) (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
3b568787 366#define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P)
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367#define VFS_VGET(MP, INO, VPP) (*(MP)->mnt_op->vfs_vget)(MP, INO, VPP)
368#define VFS_FHTOVP(MP, FIDP, VPP) \
369 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
370#define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
371#define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
372 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
373#define VFS_EXTATTRCTL(MP, C, N, A, P) \
374 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, N, A, P)
375
376#include <sys/module.h>
377
378#define VFS_SET(vfsops, fsname, flags) \
379 static struct vfsconf fsname ## _vfsconf = { \
380 &vfsops, \
381 #fsname, \
382 -1, \
383 0, \
384 flags \
385 }; \
386 static moduledata_t fsname ## _mod = { \
387 #fsname, \
388 vfs_modevent, \
389 & fsname ## _vfsconf \
390 }; \
391 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
392
393#include <net/radix.h>
394
395#define AF_MAX 33 /* XXX */
396
397/*
398 * Network address lookup element
399 */
400struct netcred {
401 struct radix_node netc_rnodes[2];
402 int netc_exflags;
403 struct ucred netc_anon;
404};
405
406/*
407 * Network export information
408 */
409struct netexport {
410 struct netcred ne_defexported; /* Default export */
411 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
412};
413
414extern char *mountrootfsname;
415
416/*
417 * exported vnode operations
418 */
dadab5e9 419int dounmount __P((struct mount *, int, struct thread *));
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420int vfs_setpublicfs /* set publicly exported fs */
421 __P((struct mount *, struct netexport *, struct export_args *));
422int vfs_lock __P((struct mount *)); /* lock a vfs */
423void vfs_msync __P((struct mount *, int));
424void vfs_unlock __P((struct mount *)); /* unlock a vfs */
8a8d5d85 425int vfs_busy __P((struct mount *, int, struct lwkt_token *, struct thread *));
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426int vfs_export /* process mount export info */
427 __P((struct mount *, struct netexport *, struct export_args *));
428struct netcred *vfs_export_lookup /* lookup host in fs export list */
429 __P((struct mount *, struct netexport *, struct sockaddr *));
430int vfs_allocate_syncvnode __P((struct mount *));
431void vfs_getnewfsid __P((struct mount *));
432dev_t vfs_getrootfsid __P((struct mount *));
433struct mount *vfs_getvfs __P((fsid_t *)); /* return vfs given fsid */
434int vfs_modevent __P((module_t, int, void *));
435int vfs_mountedon __P((struct vnode *)); /* is a vfs mounted on vp */
436int vfs_rootmountalloc __P((char *, char *, struct mount **));
dadab5e9 437void vfs_unbusy __P((struct mount *, struct thread *));
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438void vfs_unmountall __P((void));
439int vfs_register __P((struct vfsconf *));
440int vfs_unregister __P((struct vfsconf *));
441extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
8a8d5d85 442extern struct lwkt_token mountlist_token;
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443extern struct nfs_public nfs_pub;
444
445/*
446 * Declarations for these vfs default operations are located in
447 * kern/vfs_default.c, they should be used instead of making "dummy"
448 * functions or casting entries in the VFS op table to "enopnotsupp()".
449 */
450int vfs_stdmount __P((struct mount *mp, char *path, caddr_t data,
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451 struct nameidata *ndp, struct thread *p));
452int vfs_stdstart __P((struct mount *mp, int flags, struct thread *p));
453int vfs_stdunmount __P((struct mount *mp, int mntflags, struct thread *p));
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454int vfs_stdroot __P((struct mount *mp, struct vnode **vpp));
455int vfs_stdquotactl __P((struct mount *mp, int cmds, uid_t uid,
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456 caddr_t arg, struct thread *p));
457int vfs_stdstatfs __P((struct mount *mp, struct statfs *sbp, struct thread *p));
3b568787 458int vfs_stdsync __P((struct mount *mp, int waitfor, struct thread *td));
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459int vfs_stdvget __P((struct mount *mp, ino_t ino, struct vnode **vpp));
460int vfs_stdfhtovp __P((struct mount *mp, struct fid *fhp, struct vnode **vpp));
461int vfs_stdcheckexp __P((struct mount *mp, struct sockaddr *nam,
462 int *extflagsp, struct ucred **credanonp));
463int vfs_stdvptofh __P((struct vnode *vp, struct fid *fhp));
464int vfs_stdinit __P((struct vfsconf *));
465int vfs_stduninit __P((struct vfsconf *));
466int vfs_stdextattrctl __P((struct mount *mp, int cmd, const char *attrname,
dadab5e9 467 caddr_t arg, struct thread *p));
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468
469#else /* !_KERNEL */
470
471#include <sys/cdefs.h>
472
473__BEGIN_DECLS
474int fstatfs __P((int, struct statfs *));
475int getfh __P((const char *, fhandle_t *));
476int getfsstat __P((struct statfs *, long, int));
477int getmntinfo __P((struct statfs **, int));
478int mount __P((const char *, const char *, int, void *));
479int statfs __P((const char *, struct statfs *));
480int unmount __P((const char *, int));
481int fhopen __P((const struct fhandle *, int));
482int fhstat __P((const struct fhandle *, struct stat *));
483int fhstatfs __P((const struct fhandle *, struct statfs *));
484
485/* C library stuff */
486void endvfsent __P((void));
487struct ovfsconf *getvfsbyname __P((const char *));
488struct ovfsconf *getvfsbytype __P((int));
489struct ovfsconf *getvfsent __P((void));
490#define getvfsbyname new_getvfsbyname
491int new_getvfsbyname __P((const char *, struct vfsconf *));
492void setvfsent __P((int));
493int vfsisloadable __P((const char *));
494int vfsload __P((const char *));
495__END_DECLS
496
497#endif /* _KERNEL */
498
499#endif /* !_SYS_MOUNT_H_ */