FreeBSD/Linux Kernel Cross Reference
sys/sys/mount.h
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)mount.h 8.21 (Berkeley) 5/20/95
30 * $FreeBSD: releng/6.0/sys/sys/mount.h 149066 2005-08-15 06:01:36Z ssouhlal $
31 */
32
33 #ifndef _SYS_MOUNT_H_
34 #define _SYS_MOUNT_H_
35
36 #include <sys/ucred.h>
37 #include <sys/queue.h>
38 #ifdef _KERNEL
39 #include <sys/lockmgr.h>
40 #include <sys/_lock.h>
41 #include <sys/_mutex.h>
42 #endif
43
44 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
45
46 /*
47 * File identifier.
48 * These are unique per filesystem on a single machine.
49 */
50 #define MAXFIDSZ 16
51
52 struct fid {
53 u_short fid_len; /* length of data in bytes */
54 u_short fid_reserved; /* force longword alignment */
55 char fid_data[MAXFIDSZ]; /* data (variable length) */
56 };
57
58 /*
59 * filesystem statistics
60 */
61 #define MFSNAMELEN 16 /* length of type name including null */
62 #define MNAMELEN 88 /* size of on/from name bufs */
63 #define STATFS_VERSION 0x20030518 /* current version number */
64 struct statfs {
65 uint32_t f_version; /* structure version number */
66 uint32_t f_type; /* type of filesystem */
67 uint64_t f_flags; /* copy of mount exported flags */
68 uint64_t f_bsize; /* filesystem fragment size */
69 uint64_t f_iosize; /* optimal transfer block size */
70 uint64_t f_blocks; /* total data blocks in filesystem */
71 uint64_t f_bfree; /* free blocks in filesystem */
72 int64_t f_bavail; /* free blocks avail to non-superuser */
73 uint64_t f_files; /* total file nodes in filesystem */
74 int64_t f_ffree; /* free nodes avail to non-superuser */
75 uint64_t f_syncwrites; /* count of sync writes since mount */
76 uint64_t f_asyncwrites; /* count of async writes since mount */
77 uint64_t f_syncreads; /* count of sync reads since mount */
78 uint64_t f_asyncreads; /* count of async reads since mount */
79 uint64_t f_spare[10]; /* unused spare */
80 uint32_t f_namemax; /* maximum filename length */
81 uid_t f_owner; /* user that mounted the filesystem */
82 fsid_t f_fsid; /* filesystem id */
83 char f_charspare[80]; /* spare string space */
84 char f_fstypename[MFSNAMELEN]; /* filesystem type name */
85 char f_mntfromname[MNAMELEN]; /* mounted filesystem */
86 char f_mntonname[MNAMELEN]; /* directory on which mounted */
87 };
88
89 #ifdef _KERNEL
90 #define OMFSNAMELEN 16 /* length of fs type name, including null */
91 #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
92
93 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
94 /* XXX statfs.2 is out of date with read counter changes here. */
95 struct ostatfs {
96 long f_spare2; /* placeholder */
97 long f_bsize; /* fundamental filesystem block size */
98 long f_iosize; /* optimal transfer block size */
99 long f_blocks; /* total data blocks in filesystem */
100 long f_bfree; /* free blocks in fs */
101 long f_bavail; /* free blocks avail to non-superuser */
102 long f_files; /* total file nodes in filesystem */
103 long f_ffree; /* free file nodes in fs */
104 fsid_t f_fsid; /* filesystem id */
105 uid_t f_owner; /* user that mounted the filesystem */
106 int f_type; /* type of filesystem */
107 int f_flags; /* copy of mount exported flags */
108 long f_syncwrites; /* count of sync writes since mount */
109 long f_asyncwrites; /* count of async writes since mount */
110 char f_fstypename[OMFSNAMELEN]; /* fs type name */
111 char f_mntonname[OMNAMELEN]; /* directory on which mounted */
112 long f_syncreads; /* count of sync reads since mount */
113 long f_asyncreads; /* count of async reads since mount */
114 short f_spares1; /* unused spare */
115 char f_mntfromname[OMNAMELEN];/* mounted filesystem */
116 short f_spares2; /* unused spare */
117 /*
118 * XXX on machines where longs are aligned to 8-byte boundaries, there
119 * is an unnamed int32_t here. This spare was after the apparent end
120 * of the struct until we bit off the read counters from f_mntonname.
121 */
122 long f_spare[2]; /* unused spare */
123 };
124
125 #define MMAXOPTIONLEN 65536 /* maximum length of a mount option */
126
127 TAILQ_HEAD(vnodelst, vnode);
128
129 struct vfsoptlist;
130 struct vfsopt;
131
132 /*
133 * Structure per mounted filesystem. Each mounted filesystem has an
134 * array of operations and an instance record. The filesystems are
135 * put on a doubly linked list.
136 *
137 */
138 struct mount {
139 TAILQ_ENTRY(mount) mnt_list; /* mount list */
140 struct vfsops *mnt_op; /* operations on fs */
141 struct vfsconf *mnt_vfc; /* configuration info */
142 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
143 struct vnode *mnt_syncer; /* syncer vnode */
144 struct vnodelst mnt_nvnodelist; /* list of vnodes this mount */
145 struct lock mnt_lock; /* mount structure lock */
146 struct mtx mnt_mtx; /* mount structure interlock */
147 int mnt_writeopcount; /* write syscalls in progress */
148 u_int mnt_flag; /* flags shared with user */
149 struct vfsoptlist *mnt_opt; /* current mount options */
150 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
151 int mnt_kern_flag; /* kernel only flags */
152 int mnt_maxsymlinklen; /* max size of short symlink */
153 struct statfs mnt_stat; /* cache of filesystem stats */
154 struct ucred *mnt_cred; /* credentials of mounter */
155 void * mnt_data; /* private data */
156 time_t mnt_time; /* last time written*/
157 int mnt_iosize_max; /* max size for clusters, etc */
158 struct netexport *mnt_export; /* export list */
159 struct label *mnt_mntlabel; /* MAC label for the mount */
160 struct label *mnt_fslabel; /* MAC label for the fs */
161 int mnt_nvnodelistsize; /* # of vnodes on this mount */
162 u_int mnt_hashseed; /* Random seed for vfs_hash */
163 };
164
165 struct vnode *__mnt_vnode_next(struct vnode **nvp, struct mount *mp);
166
167 #define MNT_VNODE_FOREACH(vp, mp, vp2) \
168 for ((vp2) = TAILQ_FIRST(&(mp)->mnt_nvnodelist); \
169 (vp = __mnt_vnode_next(&(vp2), (mp))) != NULL;)
170
171
172 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
173 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
174 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
175
176 #endif /* _KERNEL */
177
178 /*
179 * User specifiable flags.
180 */
181 #define MNT_RDONLY 0x00000001 /* read only filesystem */
182 #define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */
183 #define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */
184 #define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */
185 #define MNT_NODEV 0 /* Deprecated option */
186 #define MNT_UNION 0x00000020 /* union with underlying filesystem */
187 #define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */
188 #define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */
189 #define MNT_SOFTDEP 0x00200000 /* soft updates being done */
190 #define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */
191 #define MNT_JAILDEVFS 0x02000000 /* jail-friendly DEVFS behaviour */
192 #define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */
193 #define MNT_ACLS 0x08000000 /* ACL support enabled */
194 #define MNT_NOATIME 0x10000000 /* disable update of file access time */
195 #define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */
196 #define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */
197
198 /*
199 * NFS export related mount flags.
200 */
201 #define MNT_EXRDONLY 0x00000080 /* exported read only */
202 #define MNT_EXPORTED 0x00000100 /* filesystem is exported */
203 #define MNT_DEFEXPORTED 0x00000200 /* exported to the world */
204 #define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */
205 #define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */
206 #define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */
207
208 /*
209 * Flags set by internal operations,
210 * but visible to the user.
211 * XXX some of these are not quite right.. (I've never seen the root flag set)
212 */
213 #define MNT_LOCAL 0x00001000 /* filesystem is stored locally */
214 #define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */
215 #define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */
216 #define MNT_USER 0x00008000 /* mounted by a user */
217 #define MNT_IGNORE 0x00800000 /* do not show entry in df */
218
219 /*
220 * Mask of flags that are visible to statfs().
221 * XXX I think that this could now become (~(MNT_CMDFLAGS))
222 * but the 'mount' program may need changing to handle this.
223 */
224 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
225 MNT_NOSUID | MNT_UNION | \
226 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
227 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
228 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
229 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
230 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
231 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
232 MNT_JAILDEVFS | MNT_MULTILABEL | MNT_ACLS)
233
234 /* Mask of flags that can be updated. */
235 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
236 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
237 MNT_NOATIME | \
238 MNT_NOSYMFOLLOW | MNT_IGNORE | MNT_JAILDEVFS | \
239 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
240 MNT_ACLS | MNT_USER)
241
242 /*
243 * External filesystem command modifier flags.
244 * Unmount can use the MNT_FORCE flag.
245 * XXX These are not STATES and really should be somewhere else.
246 */
247 #define MNT_UPDATE 0x00010000 /* not a real mount, just an update */
248 #define MNT_DELEXPORT 0x00020000 /* delete export host lists */
249 #define MNT_RELOAD 0x00040000 /* reload filesystem data */
250 #define MNT_FORCE 0x00080000 /* force unmount or readonly change */
251 #define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */
252 #define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */
253 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
254 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
255 /*
256 * Internal filesystem control flags stored in mnt_kern_flag.
257 *
258 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
259 * past the mount point. This keeps the subtree stable during mounts
260 * and unmounts.
261 *
262 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
263 * dounmount() is still waiting to lock the mountpoint. This allows
264 * the filesystem to cancel operations that might otherwise deadlock
265 * with the unmount attempt (used by NFS).
266 */
267 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
268 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
269 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
270 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
271 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
272 #define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */
273 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
274
275 /*
276 * Sysctl CTL_VFS definitions.
277 *
278 * Second level identifier specifies which filesystem. Second level
279 * identifier VFS_VFSCONF returns information about all filesystems.
280 * Second level identifier VFS_GENERIC is non-terminal.
281 */
282 #define VFS_VFSCONF 0 /* get configured filesystems */
283 #define VFS_GENERIC 0 /* generic filesystem information */
284 /*
285 * Third level identifiers for VFS_GENERIC are given below; third
286 * level identifiers for specific filesystems are given in their
287 * mount specific header files.
288 */
289 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
290 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
291 as next argument */
292
293 /*
294 * Flags for various system call interfaces.
295 *
296 * waitfor flags to vfs_sync() and getfsstat()
297 */
298 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
299 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
300 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
301
302 /*
303 * Generic file handle
304 */
305 struct fhandle {
306 fsid_t fh_fsid; /* Filesystem id of mount point */
307 struct fid fh_fid; /* Filesys specific id */
308 };
309 typedef struct fhandle fhandle_t;
310
311 /*
312 * Export arguments for local filesystem mount calls.
313 */
314 struct export_args {
315 int ex_flags; /* export related flags */
316 uid_t ex_root; /* mapping for root uid */
317 struct xucred ex_anon; /* mapping for anonymous user */
318 struct sockaddr *ex_addr; /* net address to which exported */
319 u_char ex_addrlen; /* and the net address length */
320 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
321 u_char ex_masklen; /* and the smask length */
322 char *ex_indexfile; /* index file for WebNFS URLs */
323 };
324
325 /*
326 * Structure holding information for a publicly exported filesystem
327 * (WebNFS). Currently the specs allow just for one such filesystem.
328 */
329 struct nfs_public {
330 int np_valid; /* Do we hold valid information */
331 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
332 struct mount *np_mount; /* Mountpoint of exported fs */
333 char *np_index; /* Index file */
334 };
335
336 /*
337 * Filesystem configuration information. One of these exists for each
338 * type of filesystem supported by the kernel. These are searched at
339 * mount time to identify the requested filesystem.
340 *
341 * XXX: Never change the first two arguments!
342 */
343 struct vfsconf {
344 u_int vfc_version; /* ABI version number */
345 char vfc_name[MFSNAMELEN]; /* filesystem type name */
346 struct vfsops *vfc_vfsops; /* filesystem operations vector */
347 int vfc_typenum; /* historic filesystem type number */
348 int vfc_refcount; /* number mounted of this type */
349 int vfc_flags; /* permanent flags */
350 struct vfsoptdecl *vfc_opts; /* mount options */
351 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
352 };
353
354 /* Userland version of the struct vfsconf. */
355 struct xvfsconf {
356 struct vfsops *vfc_vfsops; /* filesystem operations vector */
357 char vfc_name[MFSNAMELEN]; /* filesystem type name */
358 int vfc_typenum; /* historic filesystem type number */
359 int vfc_refcount; /* number mounted of this type */
360 int vfc_flags; /* permanent flags */
361 struct vfsconf *vfc_next; /* next in list */
362 };
363
364 #ifndef BURN_BRIDGES
365 struct ovfsconf {
366 void *vfc_vfsops;
367 char vfc_name[32];
368 int vfc_index;
369 int vfc_refcount;
370 int vfc_flags;
371 };
372 #endif
373
374 /*
375 * NB: these flags refer to IMPLEMENTATION properties, not properties of
376 * any actual mounts; i.e., it does not make sense to change the flags.
377 */
378 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
379 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
380 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
381 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
382 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
383 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/
384
385 typedef uint32_t fsctlop_t;
386
387 struct vfsidctl {
388 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
389 fsid_t vc_fsid; /* fsid to operate on. */
390 char vc_fstypename[MFSNAMELEN];
391 /* type of fs 'nfs' or '*' */
392 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
393 void *vc_ptr; /* pointer to data structure. */
394 size_t vc_len; /* sizeof said structure. */
395 u_int32_t vc_spare[12]; /* spare (must be zero). */
396 };
397
398 /* vfsidctl API version. */
399 #define VFS_CTL_VERS1 0x01
400
401 /*
402 * New style VFS sysctls, do not reuse/conflict with the namespace for
403 * private sysctls.
404 * All "global" sysctl ops have the 33rd bit set:
405 * 0x...1....
406 * Private sysctl ops should have the 33rd bit unset.
407 */
408 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
409 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
410 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
411
412 struct vfsquery {
413 u_int32_t vq_flags;
414 u_int32_t vq_spare[31];
415 };
416
417 /* vfsquery flags */
418 #define VQ_NOTRESP 0x0001 /* server down */
419 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
420 #define VQ_LOWDISK 0x0004 /* we're low on space */
421 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
422 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
423 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
424 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
425 program */
426 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
427 #define VQ_FLAG0100 0x0100 /* placeholder */
428 #define VQ_FLAG0200 0x0200 /* placeholder */
429 #define VQ_FLAG0400 0x0400 /* placeholder */
430 #define VQ_FLAG0800 0x0800 /* placeholder */
431 #define VQ_FLAG1000 0x1000 /* placeholder */
432 #define VQ_FLAG2000 0x2000 /* placeholder */
433 #define VQ_FLAG4000 0x4000 /* placeholder */
434 #define VQ_FLAG8000 0x8000 /* placeholder */
435
436 #ifdef _KERNEL
437 /* Point a sysctl request at a vfsidctl's data. */
438 #define VCTLTOREQ(vc, req) \
439 do { \
440 (req)->newptr = (vc)->vc_ptr; \
441 (req)->newlen = (vc)->vc_len; \
442 (req)->newidx = 0; \
443 } while (0)
444 #endif
445
446 struct iovec;
447 struct uio;
448
449 #ifdef _KERNEL
450
451 #ifdef MALLOC_DECLARE
452 MALLOC_DECLARE(M_MOUNT);
453 #endif
454 extern int maxvfsconf; /* highest defined filesystem type */
455 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
456
457 TAILQ_HEAD(vfsconfhead, vfsconf);
458 extern struct vfsconfhead vfsconf;
459
460 /*
461 * Operations supported on mounted filesystem.
462 */
463 struct mount_args;
464 struct nameidata;
465 struct sysctl_req;
466 struct mntarg;
467
468 typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td);
469 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
470 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp,
471 struct thread *td);
472 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
473 caddr_t arg, struct thread *td);
474 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
475 struct thread *td);
476 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td);
477 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
478 struct vnode **vpp);
479 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
480 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
481 int *extflagsp, struct ucred **credanonp);
482 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
483 typedef int vfs_init_t(struct vfsconf *);
484 typedef int vfs_uninit_t(struct vfsconf *);
485 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
486 struct vnode *filename_vp, int attrnamespace,
487 const char *attrname, struct thread *td);
488 typedef int vfs_mount_t(struct mount *mp, struct thread *td);
489 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
490 struct sysctl_req *req);
491
492 struct vfsops {
493 vfs_mount_t *vfs_mount;
494 vfs_cmount_t *vfs_cmount;
495 vfs_unmount_t *vfs_unmount;
496 vfs_root_t *vfs_root;
497 vfs_quotactl_t *vfs_quotactl;
498 vfs_statfs_t *vfs_statfs;
499 vfs_sync_t *vfs_sync;
500 vfs_vget_t *vfs_vget;
501 vfs_fhtovp_t *vfs_fhtovp;
502 vfs_checkexp_t *vfs_checkexp;
503 vfs_vptofh_t *vfs_vptofh;
504 vfs_init_t *vfs_init;
505 vfs_uninit_t *vfs_uninit;
506 vfs_extattrctl_t *vfs_extattrctl;
507 vfs_sysctl_t *vfs_sysctl;
508 };
509
510 vfs_statfs_t __vfs_statfs;
511
512 #define VFS_MOUNT(MP, P) (*(MP)->mnt_op->vfs_mount)(MP, P)
513 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
514 #define VFS_ROOT(MP, FLAGS, VPP, P) \
515 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P)
516 #define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
517 #define VFS_STATFS(MP, SBP, P) __vfs_statfs((MP), (SBP), (P))
518 #define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P)
519 #define VFS_VGET(MP, INO, FLAGS, VPP) \
520 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
521 #define VFS_FHTOVP(MP, FIDP, VPP) \
522 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
523 #define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
524 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
525 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
526 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
527 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
528 #define VFS_SYSCTL(MP, OP, REQ) \
529 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
530
531 extern int mpsafe_vfs;
532
533 #define VFS_NEEDSGIANT(MP) \
534 (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0))
535
536 #define VFS_LOCK_GIANT(MP) __extension__ \
537 ({ \
538 int _locked; \
539 if (VFS_NEEDSGIANT((MP))) { \
540 mtx_lock(&Giant); \
541 _locked = 1; \
542 } else \
543 _locked = 0; \
544 _locked; \
545 })
546 #define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant);
547 #define VFS_ASSERT_GIANT(MP) do \
548 { \
549 if (VFS_NEEDSGIANT((MP))) \
550 mtx_assert(&Giant, MA_OWNED); \
551 } while (0)
552
553 #define VFS_KNOTE_LOCKED(vp, hint) do \
554 { \
555 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
556 VN_KNOTE((vp), (hint), 1); \
557 } while (0)
558
559 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
560 { \
561 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
562 VN_KNOTE((vp), (hint), 0); \
563 } while (0)
564
565 #include <sys/module.h>
566
567 /*
568 * Version numbers.
569 */
570 #define VFS_VERSION_00 0x19660120
571 #define VFS_VERSION VFS_VERSION_00
572
573 #define VFS_SET(vfsops, fsname, flags) \
574 static struct vfsconf fsname ## _vfsconf = { \
575 .vfc_version = VFS_VERSION, \
576 .vfc_name = #fsname, \
577 .vfc_vfsops = &vfsops, \
578 .vfc_typenum = -1, \
579 .vfc_flags = flags, \
580 }; \
581 static moduledata_t fsname ## _mod = { \
582 #fsname, \
583 vfs_modevent, \
584 & fsname ## _vfsconf \
585 }; \
586 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
587
588 extern char *mountrootfsname;
589
590 /*
591 * exported vnode operations
592 */
593
594 int dounmount(struct mount *, int, struct thread *);
595
596 int kernel_mount(struct mntarg *ma, int flags);
597 int kernel_vmount(int flags, ...);
598 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
599 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
600 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
601 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
602 struct vfsconf *vfs_byname(const char *);
603 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
604 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
605 int vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val);
606 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
607 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
608 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
609 int vfs_filteropt(struct vfsoptlist *, const char **legal);
610 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
611 int vfs_setpublicfs /* set publicly exported fs */
612 (struct mount *, struct netexport *, struct export_args *);
613 int vfs_lock(struct mount *); /* lock a vfs */
614 void vfs_msync(struct mount *, int);
615 void vfs_unlock(struct mount *); /* unlock a vfs */
616 int vfs_busy(struct mount *, int, struct mtx *, struct thread *);
617 int vfs_export /* process mount export info */
618 (struct mount *, struct export_args *);
619 int vfs_allocate_syncvnode(struct mount *);
620 void vfs_getnewfsid(struct mount *);
621 struct cdev *vfs_getrootfsid(struct mount *);
622 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
623 int vfs_modevent(module_t, int, void *);
624 void vfs_mountroot(void); /* mount our root filesystem */
625 void vfs_mountedfrom(struct mount *, const char *from);
626 int vfs_suser(struct mount *, struct thread *);
627 void vfs_unbusy(struct mount *, struct thread *);
628 void vfs_unmountall(void);
629 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
630 extern struct mtx mountlist_mtx;
631 extern struct nfs_public nfs_pub;
632
633 /*
634 * Declarations for these vfs default operations are located in
635 * kern/vfs_default.c, they should be used instead of making "dummy"
636 * functions or casting entries in the VFS op table to "enopnotsupp()".
637 */
638 vfs_root_t vfs_stdroot;
639 vfs_quotactl_t vfs_stdquotactl;
640 vfs_statfs_t vfs_stdstatfs;
641 vfs_sync_t vfs_stdsync;
642 vfs_sync_t vfs_stdnosync;
643 vfs_vget_t vfs_stdvget;
644 vfs_fhtovp_t vfs_stdfhtovp;
645 vfs_checkexp_t vfs_stdcheckexp;
646 vfs_vptofh_t vfs_stdvptofh;
647 vfs_init_t vfs_stdinit;
648 vfs_uninit_t vfs_stduninit;
649 vfs_extattrctl_t vfs_stdextattrctl;
650 vfs_sysctl_t vfs_stdsysctl;
651
652 /* XXX - these should be indirect functions!!! */
653 int softdep_fsync(struct vnode *);
654 int softdep_process_worklist(struct mount *);
655
656 #else /* !_KERNEL */
657
658 #include <sys/cdefs.h>
659
660 struct stat;
661
662 __BEGIN_DECLS
663 int fhopen(const struct fhandle *, int);
664 int fhstat(const struct fhandle *, struct stat *);
665 int fhstatfs(const struct fhandle *, struct statfs *);
666 int fstatfs(int, struct statfs *);
667 int getfh(const char *, fhandle_t *);
668 int getfsstat(struct statfs *, long, int);
669 int getmntinfo(struct statfs **, int);
670 int lgetfh(const char *, fhandle_t *);
671 int mount(const char *, const char *, int, void *);
672 int nmount(struct iovec *, unsigned int, int);
673 int statfs(const char *, struct statfs *);
674 int unmount(const char *, int);
675
676 /* C library stuff */
677 int getvfsbyname(const char *, struct xvfsconf *);
678 __END_DECLS
679
680 #endif /* _KERNEL */
681
682 #endif /* !_SYS_MOUNT_H_ */
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