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 * $FreeBSD$
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 * Lock reference:
138 * m - mountlist_mtx
139 * i - interlock
140 * l - mnt_lock
141 *
142 * Unmarked fields are considered stable as long as a ref is held.
143 *
144 */
145 struct mount {
146 #define mnt_startzero mnt_list
147 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
148 struct vfsops *mnt_op; /* operations on fs */
149 struct vfsconf *mnt_vfc; /* configuration info */
150 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
151 struct vnode *mnt_syncer; /* syncer vnode */
152 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
153 #define mnt_endzero mnt_lock
154 struct lock mnt_lock; /* mount structure lock */
155 struct mtx mnt_mtx; /* mount structure interlock */
156 #define mnt_startzero2 mnt_writeopcount
157 int mnt_writeopcount; /* (i) write syscalls pending */
158 u_int mnt_flag; /* (i) flags shared with user */
159 struct vfsoptlist *mnt_opt; /* current mount options */
160 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
161 int mnt_kern_flag; /* (i) kernel only flags */
162 int mnt_maxsymlinklen; /* max size of short symlink */
163 struct statfs mnt_stat; /* cache of filesystem stats */
164 struct ucred *mnt_cred; /* credentials of mounter */
165 void * mnt_data; /* private data */
166 time_t mnt_time; /* last time written*/
167 int mnt_iosize_max; /* max size for clusters, etc */
168 struct netexport *mnt_export; /* export list */
169 struct label *mnt_mntlabel; /* MAC label for the mount */
170 struct label *mnt_fslabel; /* MAC label for the fs */
171 int mnt_nvnodelistsize; /* (i) # of vnodes */
172 u_int mnt_hashseed; /* Random seed for vfs_hash */
173 int mnt_markercnt; /* marker vnodes in use */
174 int mnt_holdcnt; /* hold count */
175 int mnt_holdcntwaiters; /* waits on hold count */
176 int mnt_secondary_writes; /* (i) # of secondary writes */
177 #define mnt_endzero2 mnt_secondary_accwrites
178 int mnt_secondary_accwrites;/* (i) secondary wr. starts */
179 int mnt_ref; /* (i) Reference count */
180 int mnt_gen; /* struct mount generation */
181 struct lock mnt_explock; /* vfs_export walkers lock */
182 };
183
184 struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp);
185 struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp);
186 void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
187
188 #define MNT_VNODE_FOREACH(vp, mp, mvp) \
189 for (vp = __mnt_vnode_first(&(mvp), (mp)); \
190 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp)))
191
192 #define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \
193 __mnt_vnode_markerfree(&(mvp), (mp))
194
195 #define MNT_VNODE_FOREACH_ABORT(mp, mvp) \
196 do { \
197 MNT_ILOCK(mp); \
198 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \
199 MNT_IUNLOCK(mp); \
200 } while (0)
201
202 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
203 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
204 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
205 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
206 #define MNT_REF(mp) (mp)->mnt_ref++
207 #define MNT_REL(mp) do { \
208 (mp)->mnt_ref--; \
209 if ((mp)->mnt_ref == 0) \
210 wakeup((mp)); \
211 } while (0)
212
213 #endif /* _KERNEL */
214
215 /*
216 * User specifiable flags.
217 */
218 #define MNT_RDONLY 0x00000001 /* read only filesystem */
219 #define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */
220 #define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */
221 #define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */
222 #define MNT_NODEV 0 /* Deprecated option */
223 #define MNT_UNION 0x00000020 /* union with underlying filesystem */
224 #define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */
225 #define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */
226 #define MNT_SOFTDEP 0x00200000 /* soft updates being done */
227 #define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */
228 #define MNT_JAILDEVFS 0x02000000 /* jail-friendly DEVFS behaviour */
229 #define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */
230 #define MNT_ACLS 0x08000000 /* ACL support enabled */
231 #define MNT_NOATIME 0x10000000 /* disable update of file access time */
232 #define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */
233 #define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */
234
235 /*
236 * NFS export related mount flags.
237 */
238 #define MNT_EXRDONLY 0x00000080 /* exported read only */
239 #define MNT_EXPORTED 0x00000100 /* filesystem is exported */
240 #define MNT_DEFEXPORTED 0x00000200 /* exported to the world */
241 #define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */
242 #define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */
243 #define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */
244
245 /*
246 * Flags set by internal operations,
247 * but visible to the user.
248 * XXX some of these are not quite right.. (I've never seen the root flag set)
249 */
250 #define MNT_LOCAL 0x00001000 /* filesystem is stored locally */
251 #define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */
252 #define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */
253 #define MNT_USER 0x00008000 /* mounted by a user */
254 #define MNT_IGNORE 0x00800000 /* do not show entry in df */
255
256 /*
257 * Mask of flags that are visible to statfs().
258 * XXX I think that this could now become (~(MNT_CMDFLAGS))
259 * but the 'mount' program may need changing to handle this.
260 */
261 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
262 MNT_NOSUID | MNT_UNION | \
263 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
264 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
265 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
266 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
267 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
268 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
269 MNT_JAILDEVFS | MNT_MULTILABEL | MNT_ACLS)
270
271 /* Mask of flags that can be updated. */
272 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
273 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
274 MNT_NOATIME | \
275 MNT_NOSYMFOLLOW | MNT_IGNORE | MNT_JAILDEVFS | \
276 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
277 MNT_ACLS | MNT_USER)
278
279 /*
280 * External filesystem command modifier flags.
281 * Unmount can use the MNT_FORCE flag.
282 * XXX These are not STATES and really should be somewhere else.
283 */
284 #define MNT_UPDATE 0x00010000 /* not a real mount, just an update */
285 #define MNT_DELEXPORT 0x00020000 /* delete export host lists */
286 #define MNT_RELOAD 0x00040000 /* reload filesystem data */
287 #define MNT_FORCE 0x00080000 /* force unmount or readonly change */
288 #define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */
289 #define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */
290 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
291 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
292 /*
293 * Internal filesystem control flags stored in mnt_kern_flag.
294 *
295 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
296 * past the mount point. This keeps the subtree stable during mounts
297 * and unmounts.
298 *
299 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
300 * dounmount() is still waiting to lock the mountpoint. This allows
301 * the filesystem to cancel operations that might otherwise deadlock
302 * with the unmount attempt (used by NFS).
303 */
304 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
305 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
306 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
307 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
308 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
309 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
310 #define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */
311 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
312 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
313
314 /*
315 * Sysctl CTL_VFS definitions.
316 *
317 * Second level identifier specifies which filesystem. Second level
318 * identifier VFS_VFSCONF returns information about all filesystems.
319 * Second level identifier VFS_GENERIC is non-terminal.
320 */
321 #define VFS_VFSCONF 0 /* get configured filesystems */
322 #define VFS_GENERIC 0 /* generic filesystem information */
323 /*
324 * Third level identifiers for VFS_GENERIC are given below; third
325 * level identifiers for specific filesystems are given in their
326 * mount specific header files.
327 */
328 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
329 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
330 as next argument */
331
332 /*
333 * Flags for various system call interfaces.
334 *
335 * waitfor flags to vfs_sync() and getfsstat()
336 */
337 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
338 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
339 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
340 #define MNT_SUSPEND 4 /* Suspend file system after sync */
341
342 /*
343 * Generic file handle
344 */
345 struct fhandle {
346 fsid_t fh_fsid; /* Filesystem id of mount point */
347 struct fid fh_fid; /* Filesys specific id */
348 };
349 typedef struct fhandle fhandle_t;
350
351 /*
352 * Export arguments for local filesystem mount calls.
353 */
354 struct export_args {
355 int ex_flags; /* export related flags */
356 uid_t ex_root; /* mapping for root uid */
357 struct xucred ex_anon; /* mapping for anonymous user */
358 struct sockaddr *ex_addr; /* net address to which exported */
359 u_char ex_addrlen; /* and the net address length */
360 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
361 u_char ex_masklen; /* and the smask length */
362 char *ex_indexfile; /* index file for WebNFS URLs */
363 };
364
365 /*
366 * Structure holding information for a publicly exported filesystem
367 * (WebNFS). Currently the specs allow just for one such filesystem.
368 */
369 struct nfs_public {
370 int np_valid; /* Do we hold valid information */
371 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
372 struct mount *np_mount; /* Mountpoint of exported fs */
373 char *np_index; /* Index file */
374 };
375
376 /*
377 * Filesystem configuration information. One of these exists for each
378 * type of filesystem supported by the kernel. These are searched at
379 * mount time to identify the requested filesystem.
380 *
381 * XXX: Never change the first two arguments!
382 */
383 struct vfsconf {
384 u_int vfc_version; /* ABI version number */
385 char vfc_name[MFSNAMELEN]; /* filesystem type name */
386 struct vfsops *vfc_vfsops; /* filesystem operations vector */
387 int vfc_typenum; /* historic filesystem type number */
388 int vfc_refcount; /* number mounted of this type */
389 int vfc_flags; /* permanent flags */
390 struct vfsoptdecl *vfc_opts; /* mount options */
391 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
392 };
393
394 /* Userland version of the struct vfsconf. */
395 struct xvfsconf {
396 struct vfsops *vfc_vfsops; /* filesystem operations vector */
397 char vfc_name[MFSNAMELEN]; /* filesystem type name */
398 int vfc_typenum; /* historic filesystem type number */
399 int vfc_refcount; /* number mounted of this type */
400 int vfc_flags; /* permanent flags */
401 struct vfsconf *vfc_next; /* next in list */
402 };
403
404 #ifndef BURN_BRIDGES
405 struct ovfsconf {
406 void *vfc_vfsops;
407 char vfc_name[32];
408 int vfc_index;
409 int vfc_refcount;
410 int vfc_flags;
411 };
412 #endif
413
414 /*
415 * NB: these flags refer to IMPLEMENTATION properties, not properties of
416 * any actual mounts; i.e., it does not make sense to change the flags.
417 */
418 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
419 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
420 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
421 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
422 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
423 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/
424
425 typedef uint32_t fsctlop_t;
426
427 struct vfsidctl {
428 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
429 fsid_t vc_fsid; /* fsid to operate on. */
430 char vc_fstypename[MFSNAMELEN];
431 /* type of fs 'nfs' or '*' */
432 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
433 void *vc_ptr; /* pointer to data structure. */
434 size_t vc_len; /* sizeof said structure. */
435 u_int32_t vc_spare[12]; /* spare (must be zero). */
436 };
437
438 /* vfsidctl API version. */
439 #define VFS_CTL_VERS1 0x01
440
441 /*
442 * New style VFS sysctls, do not reuse/conflict with the namespace for
443 * private sysctls.
444 * All "global" sysctl ops have the 33rd bit set:
445 * 0x...1....
446 * Private sysctl ops should have the 33rd bit unset.
447 */
448 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
449 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
450 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
451
452 struct vfsquery {
453 u_int32_t vq_flags;
454 u_int32_t vq_spare[31];
455 };
456
457 /* vfsquery flags */
458 #define VQ_NOTRESP 0x0001 /* server down */
459 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
460 #define VQ_LOWDISK 0x0004 /* we're low on space */
461 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
462 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
463 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
464 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
465 program */
466 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
467 #define VQ_FLAG0100 0x0100 /* placeholder */
468 #define VQ_FLAG0200 0x0200 /* placeholder */
469 #define VQ_FLAG0400 0x0400 /* placeholder */
470 #define VQ_FLAG0800 0x0800 /* placeholder */
471 #define VQ_FLAG1000 0x1000 /* placeholder */
472 #define VQ_FLAG2000 0x2000 /* placeholder */
473 #define VQ_FLAG4000 0x4000 /* placeholder */
474 #define VQ_FLAG8000 0x8000 /* placeholder */
475
476 #ifdef _KERNEL
477 /* Point a sysctl request at a vfsidctl's data. */
478 #define VCTLTOREQ(vc, req) \
479 do { \
480 (req)->newptr = (vc)->vc_ptr; \
481 (req)->newlen = (vc)->vc_len; \
482 (req)->newidx = 0; \
483 } while (0)
484 #endif
485
486 struct iovec;
487 struct uio;
488
489 #ifdef _KERNEL
490
491 #ifdef MALLOC_DECLARE
492 MALLOC_DECLARE(M_MOUNT);
493 #endif
494 extern int maxvfsconf; /* highest defined filesystem type */
495 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
496
497 TAILQ_HEAD(vfsconfhead, vfsconf);
498 extern struct vfsconfhead vfsconf;
499
500 /*
501 * Operations supported on mounted filesystem.
502 */
503 struct mount_args;
504 struct nameidata;
505 struct sysctl_req;
506 struct mntarg;
507
508 typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td);
509 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
510 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp,
511 struct thread *td);
512 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
513 caddr_t arg, struct thread *td);
514 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
515 struct thread *td);
516 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td);
517 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
518 struct vnode **vpp);
519 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
520 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
521 int *extflagsp, struct ucred **credanonp);
522 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
523 typedef int vfs_init_t(struct vfsconf *);
524 typedef int vfs_uninit_t(struct vfsconf *);
525 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
526 struct vnode *filename_vp, int attrnamespace,
527 const char *attrname, struct thread *td);
528 typedef int vfs_mount_t(struct mount *mp, struct thread *td);
529 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
530 struct sysctl_req *req);
531
532 struct vfsops {
533 vfs_mount_t *vfs_mount;
534 vfs_cmount_t *vfs_cmount;
535 vfs_unmount_t *vfs_unmount;
536 vfs_root_t *vfs_root;
537 vfs_quotactl_t *vfs_quotactl;
538 vfs_statfs_t *vfs_statfs;
539 vfs_sync_t *vfs_sync;
540 vfs_vget_t *vfs_vget;
541 vfs_fhtovp_t *vfs_fhtovp;
542 vfs_checkexp_t *vfs_checkexp;
543 vfs_vptofh_t *vfs_vptofh;
544 vfs_init_t *vfs_init;
545 vfs_uninit_t *vfs_uninit;
546 vfs_extattrctl_t *vfs_extattrctl;
547 vfs_sysctl_t *vfs_sysctl;
548 };
549
550 vfs_statfs_t __vfs_statfs;
551
552 #define VFS_MOUNT(MP, P) (*(MP)->mnt_op->vfs_mount)(MP, P)
553 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
554 #define VFS_ROOT(MP, FLAGS, VPP, P) \
555 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P)
556 #define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
557 #define VFS_STATFS(MP, SBP, P) __vfs_statfs((MP), (SBP), (P))
558 #define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P)
559 #define VFS_VGET(MP, INO, FLAGS, VPP) \
560 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
561 #define VFS_FHTOVP(MP, FIDP, VPP) \
562 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
563 #define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
564 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
565 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
566 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
567 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
568 #define VFS_SYSCTL(MP, OP, REQ) \
569 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
570
571 extern int mpsafe_vfs;
572
573 #define VFS_NEEDSGIANT_(MP) \
574 (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0))
575
576 #define VFS_NEEDSGIANT(MP) __extension__ \
577 ({ \
578 struct mount *_mp; \
579 _mp = (MP); \
580 VFS_NEEDSGIANT_(_mp); \
581 })
582
583 #define VFS_LOCK_GIANT(MP) __extension__ \
584 ({ \
585 int _locked; \
586 struct mount *_mp; \
587 _mp = (MP); \
588 if (VFS_NEEDSGIANT_(_mp)) { \
589 mtx_lock(&Giant); \
590 _locked = 1; \
591 } else \
592 _locked = 0; \
593 _locked; \
594 })
595 #define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant);
596 #define VFS_ASSERT_GIANT(MP) do \
597 { \
598 struct mount *_mp; \
599 _mp = (MP); \
600 if (VFS_NEEDSGIANT_(_mp)) \
601 mtx_assert(&Giant, MA_OWNED); \
602 } while (0)
603
604 #define VFS_KNOTE_LOCKED(vp, hint) do \
605 { \
606 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
607 VN_KNOTE((vp), (hint), 1); \
608 } while (0)
609
610 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
611 { \
612 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
613 VN_KNOTE((vp), (hint), 0); \
614 } while (0)
615
616 #include <sys/module.h>
617
618 /*
619 * Version numbers.
620 */
621 #define VFS_VERSION_00 0x19660120
622 #define VFS_VERSION VFS_VERSION_00
623
624 #define VFS_SET(vfsops, fsname, flags) \
625 static struct vfsconf fsname ## _vfsconf = { \
626 .vfc_version = VFS_VERSION, \
627 .vfc_name = #fsname, \
628 .vfc_vfsops = &vfsops, \
629 .vfc_typenum = -1, \
630 .vfc_flags = flags, \
631 }; \
632 static moduledata_t fsname ## _mod = { \
633 #fsname, \
634 vfs_modevent, \
635 & fsname ## _vfsconf \
636 }; \
637 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
638
639 extern char *mountrootfsname;
640
641 /*
642 * exported vnode operations
643 */
644
645 int dounmount(struct mount *, int, struct thread *);
646
647 int kernel_mount(struct mntarg *ma, int flags);
648 int kernel_vmount(int flags, ...);
649 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
650 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
651 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
652 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
653 struct vfsconf *vfs_byname(const char *);
654 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
655 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
656 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
657 int vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val);
658 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
659 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
660 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
661 int vfs_filteropt(struct vfsoptlist *, const char **legal);
662 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
663 int vfs_setpublicfs /* set publicly exported fs */
664 (struct mount *, struct netexport *, struct export_args *);
665 void vfs_msync(struct mount *, int);
666 int vfs_busy(struct mount *, int, struct mtx *, struct thread *);
667 int vfs_export /* process mount export info */
668 (struct mount *, struct export_args *);
669 int vfs_allocate_syncvnode(struct mount *);
670 void vfs_getnewfsid(struct mount *);
671 struct cdev *vfs_getrootfsid(struct mount *);
672 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
673 int vfs_modevent(module_t, int, void *);
674 void vfs_mount_error(struct mount *, const char *, ...);
675 void vfs_mountroot(void); /* mount our root filesystem */
676 void vfs_mountedfrom(struct mount *, const char *from);
677 void vfs_ref(struct mount *);
678 void vfs_rel(struct mount *);
679 int vfs_suser(struct mount *, struct thread *);
680 void vfs_unbusy(struct mount *, struct thread *);
681 void vfs_unmountall(void);
682 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
683 extern struct mtx mountlist_mtx;
684 extern struct nfs_public nfs_pub;
685
686 /*
687 * Declarations for these vfs default operations are located in
688 * kern/vfs_default.c, they should be used instead of making "dummy"
689 * functions or casting entries in the VFS op table to "enopnotsupp()".
690 */
691 vfs_root_t vfs_stdroot;
692 vfs_quotactl_t vfs_stdquotactl;
693 vfs_statfs_t vfs_stdstatfs;
694 vfs_sync_t vfs_stdsync;
695 vfs_sync_t vfs_stdnosync;
696 vfs_vget_t vfs_stdvget;
697 vfs_fhtovp_t vfs_stdfhtovp;
698 vfs_checkexp_t vfs_stdcheckexp;
699 vfs_vptofh_t vfs_stdvptofh;
700 vfs_init_t vfs_stdinit;
701 vfs_uninit_t vfs_stduninit;
702 vfs_extattrctl_t vfs_stdextattrctl;
703 vfs_sysctl_t vfs_stdsysctl;
704
705 #else /* !_KERNEL */
706
707 #include <sys/cdefs.h>
708
709 struct stat;
710
711 __BEGIN_DECLS
712 int fhopen(const struct fhandle *, int);
713 int fhstat(const struct fhandle *, struct stat *);
714 int fhstatfs(const struct fhandle *, struct statfs *);
715 int fstatfs(int, struct statfs *);
716 int getfh(const char *, fhandle_t *);
717 int getfsstat(struct statfs *, long, int);
718 int getmntinfo(struct statfs **, int);
719 int lgetfh(const char *, fhandle_t *);
720 int mount(const char *, const char *, int, void *);
721 int nmount(struct iovec *, unsigned int, int);
722 int statfs(const char *, struct statfs *);
723 int unmount(const char *, int);
724
725 /* C library stuff */
726 int getvfsbyname(const char *, struct xvfsconf *);
727 __END_DECLS
728
729 #endif /* _KERNEL */
730
731 #endif /* !_SYS_MOUNT_H_ */
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