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/9.1/sys/sys/mount.h 235626 2012-05-18 19:48:38Z mckusick $
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/lock.h>
40 #include <sys/lockmgr.h>
41 #include <sys/_mutex.h>
42 #endif
43
44 /*
45 * NOTE: When changing statfs structure, mount structure, MNT_* flags or
46 * MNTK_* flags also update DDB show mount command in vfs_subr.c.
47 */
48
49 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
50
51 /*
52 * File identifier.
53 * These are unique per filesystem on a single machine.
54 */
55 #define MAXFIDSZ 16
56
57 struct fid {
58 u_short fid_len; /* length of data in bytes */
59 u_short fid_data0; /* force longword alignment */
60 char fid_data[MAXFIDSZ]; /* data (variable length) */
61 };
62
63 /*
64 * filesystem statistics
65 */
66 #define MFSNAMELEN 16 /* length of type name including null */
67 #define MNAMELEN 88 /* size of on/from name bufs */
68 #define STATFS_VERSION 0x20030518 /* current version number */
69 struct statfs {
70 uint32_t f_version; /* structure version number */
71 uint32_t f_type; /* type of filesystem */
72 uint64_t f_flags; /* copy of mount exported flags */
73 uint64_t f_bsize; /* filesystem fragment size */
74 uint64_t f_iosize; /* optimal transfer block size */
75 uint64_t f_blocks; /* total data blocks in filesystem */
76 uint64_t f_bfree; /* free blocks in filesystem */
77 int64_t f_bavail; /* free blocks avail to non-superuser */
78 uint64_t f_files; /* total file nodes in filesystem */
79 int64_t f_ffree; /* free nodes avail to non-superuser */
80 uint64_t f_syncwrites; /* count of sync writes since mount */
81 uint64_t f_asyncwrites; /* count of async writes since mount */
82 uint64_t f_syncreads; /* count of sync reads since mount */
83 uint64_t f_asyncreads; /* count of async reads since mount */
84 uint64_t f_spare[10]; /* unused spare */
85 uint32_t f_namemax; /* maximum filename length */
86 uid_t f_owner; /* user that mounted the filesystem */
87 fsid_t f_fsid; /* filesystem id */
88 char f_charspare[80]; /* spare string space */
89 char f_fstypename[MFSNAMELEN]; /* filesystem type name */
90 char f_mntfromname[MNAMELEN]; /* mounted filesystem */
91 char f_mntonname[MNAMELEN]; /* directory on which mounted */
92 };
93
94 #ifdef _KERNEL
95 #define OMFSNAMELEN 16 /* length of fs type name, including null */
96 #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
97
98 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
99 /* XXX statfs.2 is out of date with read counter changes here. */
100 struct ostatfs {
101 long f_spare2; /* placeholder */
102 long f_bsize; /* fundamental filesystem block size */
103 long f_iosize; /* optimal transfer block size */
104 long f_blocks; /* total data blocks in filesystem */
105 long f_bfree; /* free blocks in fs */
106 long f_bavail; /* free blocks avail to non-superuser */
107 long f_files; /* total file nodes in filesystem */
108 long f_ffree; /* free file nodes in fs */
109 fsid_t f_fsid; /* filesystem id */
110 uid_t f_owner; /* user that mounted the filesystem */
111 int f_type; /* type of filesystem */
112 int f_flags; /* copy of mount exported flags */
113 long f_syncwrites; /* count of sync writes since mount */
114 long f_asyncwrites; /* count of async writes since mount */
115 char f_fstypename[OMFSNAMELEN]; /* fs type name */
116 char f_mntonname[OMNAMELEN]; /* directory on which mounted */
117 long f_syncreads; /* count of sync reads since mount */
118 long f_asyncreads; /* count of async reads since mount */
119 short f_spares1; /* unused spare */
120 char f_mntfromname[OMNAMELEN];/* mounted filesystem */
121 short f_spares2; /* unused spare */
122 /*
123 * XXX on machines where longs are aligned to 8-byte boundaries, there
124 * is an unnamed int32_t here. This spare was after the apparent end
125 * of the struct until we bit off the read counters from f_mntonname.
126 */
127 long f_spare[2]; /* unused spare */
128 };
129
130 TAILQ_HEAD(vnodelst, vnode);
131
132 /* Mount options list */
133 TAILQ_HEAD(vfsoptlist, vfsopt);
134 struct vfsopt {
135 TAILQ_ENTRY(vfsopt) link;
136 char *name;
137 void *value;
138 int len;
139 int pos;
140 int seen;
141 };
142
143 /*
144 * Structure per mounted filesystem. Each mounted filesystem has an
145 * array of operations and an instance record. The filesystems are
146 * put on a doubly linked list.
147 *
148 * Lock reference:
149 * m - mountlist_mtx
150 * i - interlock
151 * v - vnode freelist mutex
152 *
153 * Unmarked fields are considered stable as long as a ref is held.
154 *
155 */
156 struct mount {
157 struct mtx mnt_mtx; /* mount structure interlock */
158 int mnt_gen; /* struct mount generation */
159 #define mnt_startzero mnt_list
160 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
161 struct vfsops *mnt_op; /* operations on fs */
162 struct vfsconf *mnt_vfc; /* configuration info */
163 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
164 struct vnode *mnt_syncer; /* syncer vnode */
165 int mnt_ref; /* (i) Reference count */
166 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
167 int mnt_nvnodelistsize; /* (i) # of vnodes */
168 struct vnodelst mnt_activevnodelist; /* (v) list of active vnodes */
169 int mnt_activevnodelistsize;/* (v) # of active vnodes */
170 int mnt_writeopcount; /* (i) write syscalls pending */
171 int mnt_kern_flag; /* (i) kernel only flags */
172 uint64_t mnt_flag; /* (i) flags shared with user */
173 u_int mnt_pad_noasync;
174 struct vfsoptlist *mnt_opt; /* current mount options */
175 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
176 int mnt_maxsymlinklen; /* max size of short symlink */
177 struct statfs mnt_stat; /* cache of filesystem stats */
178 struct ucred *mnt_cred; /* credentials of mounter */
179 void * mnt_data; /* private data */
180 time_t mnt_time; /* last time written*/
181 int mnt_iosize_max; /* max size for clusters, etc */
182 struct netexport *mnt_export; /* export list */
183 struct label *mnt_label; /* MAC label for the fs */
184 u_int mnt_hashseed; /* Random seed for vfs_hash */
185 int mnt_lockref; /* (i) Lock reference count */
186 int mnt_secondary_writes; /* (i) # of secondary writes */
187 int mnt_secondary_accwrites;/* (i) secondary wr. starts */
188 struct thread *mnt_susp_owner; /* (i) thread owning suspension */
189 #define mnt_endzero mnt_gjprovider
190 char *mnt_gjprovider; /* gjournal provider name */
191 struct lock mnt_explock; /* vfs_export walkers lock */
192 };
193
194 /*
195 * Definitions for MNT_VNODE_FOREACH_ALL.
196 */
197 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
198 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
199 void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
200
201 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \
202 for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \
203 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
204
205 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \
206 do { \
207 MNT_ILOCK(mp); \
208 __mnt_vnode_markerfree_all(&(mvp), (mp)); \
209 /* MNT_IUNLOCK(mp); -- done in above function */ \
210 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
211 } while (0)
212
213 /*
214 * Definitions for MNT_VNODE_FOREACH_ACTIVE.
215 */
216 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
217 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
218 void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
219
220 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \
221 for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \
222 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
223
224 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \
225 do { \
226 MNT_ILOCK(mp); \
227 __mnt_vnode_markerfree_active(&(mvp), (mp)); \
228 /* MNT_IUNLOCK(mp); -- done in above function */ \
229 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
230 } while (0)
231
232 /*
233 * Definitions for MNT_VNODE_FOREACH.
234 *
235 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL.
236 */
237 struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp);
238 struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp);
239 void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
240
241 #define MNT_VNODE_FOREACH(vp, mp, mvp) \
242 for (vp = __mnt_vnode_first(&(mvp), (mp)); \
243 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp)))
244
245 #define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \
246 __mnt_vnode_markerfree(&(mvp), (mp))
247
248 #define MNT_VNODE_FOREACH_ABORT(mp, mvp) \
249 do { \
250 MNT_ILOCK(mp); \
251 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \
252 MNT_IUNLOCK(mp); \
253 } while (0)
254
255 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
256 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
257 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
258 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
259 #define MNT_REF(mp) (mp)->mnt_ref++
260 #define MNT_REL(mp) do { \
261 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
262 (mp)->mnt_ref--; \
263 if ((mp)->mnt_ref == 0) \
264 wakeup((mp)); \
265 } while (0)
266
267 #endif /* _KERNEL */
268
269 /*
270 * User specifiable flags, stored in mnt_flag.
271 */
272 #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */
273 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
274 #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */
275 #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */
276 #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */
277 #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */
278 #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */
279 #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */
280 #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */
281 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
282 #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */
283 #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */
284 #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */
285 #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */
286 #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */
287 #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */
288 #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */
289
290 /*
291 * NFS export related mount flags.
292 */
293 #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */
294 #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */
295 #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */
296 #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */
297 #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */
298 #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */
299
300 /*
301 * Flags set by internal operations,
302 * but visible to the user.
303 * XXX some of these are not quite right.. (I've never seen the root flag set)
304 */
305 #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */
306 #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */
307 #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */
308 #define MNT_USER 0x0000000000008000ULL /* mounted by a user */
309 #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */
310
311 /*
312 * Mask of flags that are visible to statfs().
313 * XXX I think that this could now become (~(MNT_CMDFLAGS))
314 * but the 'mount' program may need changing to handle this.
315 */
316 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
317 MNT_NOSUID | MNT_UNION | MNT_SUJ | \
318 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
319 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
320 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
321 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
322 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
323 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
324 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \
325 MNT_NFS4ACLS)
326
327 /* Mask of flags that can be updated. */
328 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
329 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
330 MNT_NOATIME | \
331 MNT_NOSYMFOLLOW | MNT_IGNORE | \
332 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
333 MNT_ACLS | MNT_USER | MNT_NFS4ACLS)
334
335 /*
336 * External filesystem command modifier flags.
337 * Unmount can use the MNT_FORCE flag.
338 * XXX: These are not STATES and really should be somewhere else.
339 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
340 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
341 */
342 #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */
343 #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */
344 #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */
345 #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */
346 #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */
347 #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */
348 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
349 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
350 /*
351 * Internal filesystem control flags stored in mnt_kern_flag.
352 *
353 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
354 * past the mount point. This keeps the subtree stable during mounts
355 * and unmounts.
356 *
357 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
358 * dounmount() is still waiting to lock the mountpoint. This allows
359 * the filesystem to cancel operations that might otherwise deadlock
360 * with the unmount attempt (used by NFS).
361 *
362 * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
363 * to allow for failed unmount attempt to restore the syncer vnode for
364 * the mount.
365 */
366 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
367 #define MNTK_ASYNC 0x00000002 /* filtered async flag */
368 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
369 #define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */
370 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */
371 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
372 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
373 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
374 #define MNTK_NOASYNC 0x00800000 /* disable async */
375 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
376 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
377 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
378 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
379 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
380 #define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */
381 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
382 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
383
384 #define MNT_SHARED_WRITES(mp) (((mp) != NULL) && \
385 ((mp)->mnt_kern_flag & MNTK_SHARED_WRITES))
386
387 /*
388 * Sysctl CTL_VFS definitions.
389 *
390 * Second level identifier specifies which filesystem. Second level
391 * identifier VFS_VFSCONF returns information about all filesystems.
392 * Second level identifier VFS_GENERIC is non-terminal.
393 */
394 #define VFS_VFSCONF 0 /* get configured filesystems */
395 #define VFS_GENERIC 0 /* generic filesystem information */
396 /*
397 * Third level identifiers for VFS_GENERIC are given below; third
398 * level identifiers for specific filesystems are given in their
399 * mount specific header files.
400 */
401 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
402 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
403 as next argument */
404
405 /*
406 * Flags for various system call interfaces.
407 *
408 * waitfor flags to vfs_sync() and getfsstat()
409 */
410 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
411 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
412 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
413 #define MNT_SUSPEND 4 /* Suspend file system after sync */
414
415 /*
416 * Generic file handle
417 */
418 struct fhandle {
419 fsid_t fh_fsid; /* Filesystem id of mount point */
420 struct fid fh_fid; /* Filesys specific id */
421 };
422 typedef struct fhandle fhandle_t;
423
424 /*
425 * Old export arguments without security flavor list
426 */
427 struct oexport_args {
428 int ex_flags; /* export related flags */
429 uid_t ex_root; /* mapping for root uid */
430 struct xucred ex_anon; /* mapping for anonymous user */
431 struct sockaddr *ex_addr; /* net address to which exported */
432 u_char ex_addrlen; /* and the net address length */
433 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
434 u_char ex_masklen; /* and the smask length */
435 char *ex_indexfile; /* index file for WebNFS URLs */
436 };
437
438 /*
439 * Export arguments for local filesystem mount calls.
440 */
441 #define MAXSECFLAVORS 5
442 struct export_args {
443 int ex_flags; /* export related flags */
444 uid_t ex_root; /* mapping for root uid */
445 struct xucred ex_anon; /* mapping for anonymous user */
446 struct sockaddr *ex_addr; /* net address to which exported */
447 u_char ex_addrlen; /* and the net address length */
448 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
449 u_char ex_masklen; /* and the smask length */
450 char *ex_indexfile; /* index file for WebNFS URLs */
451 int ex_numsecflavors; /* security flavor count */
452 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
453 };
454
455 /*
456 * Structure holding information for a publicly exported filesystem
457 * (WebNFS). Currently the specs allow just for one such filesystem.
458 */
459 struct nfs_public {
460 int np_valid; /* Do we hold valid information */
461 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
462 struct mount *np_mount; /* Mountpoint of exported fs */
463 char *np_index; /* Index file */
464 };
465
466 /*
467 * Filesystem configuration information. One of these exists for each
468 * type of filesystem supported by the kernel. These are searched at
469 * mount time to identify the requested filesystem.
470 *
471 * XXX: Never change the first two arguments!
472 */
473 struct vfsconf {
474 u_int vfc_version; /* ABI version number */
475 char vfc_name[MFSNAMELEN]; /* filesystem type name */
476 struct vfsops *vfc_vfsops; /* filesystem operations vector */
477 int vfc_typenum; /* historic filesystem type number */
478 int vfc_refcount; /* number mounted of this type */
479 int vfc_flags; /* permanent flags */
480 struct vfsoptdecl *vfc_opts; /* mount options */
481 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
482 };
483
484 /* Userland version of the struct vfsconf. */
485 struct xvfsconf {
486 struct vfsops *vfc_vfsops; /* filesystem operations vector */
487 char vfc_name[MFSNAMELEN]; /* filesystem type name */
488 int vfc_typenum; /* historic filesystem type number */
489 int vfc_refcount; /* number mounted of this type */
490 int vfc_flags; /* permanent flags */
491 struct vfsconf *vfc_next; /* next in list */
492 };
493
494 #ifndef BURN_BRIDGES
495 struct ovfsconf {
496 void *vfc_vfsops;
497 char vfc_name[32];
498 int vfc_index;
499 int vfc_refcount;
500 int vfc_flags;
501 };
502 #endif
503
504 /*
505 * NB: these flags refer to IMPLEMENTATION properties, not properties of
506 * any actual mounts; i.e., it does not make sense to change the flags.
507 */
508 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
509 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
510 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
511 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
512 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
513 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
514 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
515 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
516
517 typedef uint32_t fsctlop_t;
518
519 struct vfsidctl {
520 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
521 fsid_t vc_fsid; /* fsid to operate on */
522 char vc_fstypename[MFSNAMELEN];
523 /* type of fs 'nfs' or '*' */
524 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
525 void *vc_ptr; /* pointer to data structure */
526 size_t vc_len; /* sizeof said structure */
527 u_int32_t vc_spare[12]; /* spare (must be zero) */
528 };
529
530 /* vfsidctl API version. */
531 #define VFS_CTL_VERS1 0x01
532
533 /*
534 * New style VFS sysctls, do not reuse/conflict with the namespace for
535 * private sysctls.
536 * All "global" sysctl ops have the 33rd bit set:
537 * 0x...1....
538 * Private sysctl ops should have the 33rd bit unset.
539 */
540 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
541 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
542 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
543
544 struct vfsquery {
545 u_int32_t vq_flags;
546 u_int32_t vq_spare[31];
547 };
548
549 /* vfsquery flags */
550 #define VQ_NOTRESP 0x0001 /* server down */
551 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
552 #define VQ_LOWDISK 0x0004 /* we're low on space */
553 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
554 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
555 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
556 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
557 program */
558 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
559 #define VQ_FLAG0100 0x0100 /* placeholder */
560 #define VQ_FLAG0200 0x0200 /* placeholder */
561 #define VQ_FLAG0400 0x0400 /* placeholder */
562 #define VQ_FLAG0800 0x0800 /* placeholder */
563 #define VQ_FLAG1000 0x1000 /* placeholder */
564 #define VQ_FLAG2000 0x2000 /* placeholder */
565 #define VQ_FLAG4000 0x4000 /* placeholder */
566 #define VQ_FLAG8000 0x8000 /* placeholder */
567
568 #ifdef _KERNEL
569 /* Point a sysctl request at a vfsidctl's data. */
570 #define VCTLTOREQ(vc, req) \
571 do { \
572 (req)->newptr = (vc)->vc_ptr; \
573 (req)->newlen = (vc)->vc_len; \
574 (req)->newidx = 0; \
575 } while (0)
576 #endif
577
578 struct iovec;
579 struct uio;
580
581 #ifdef _KERNEL
582
583 /*
584 * vfs_busy specific flags and mask.
585 */
586 #define MBF_NOWAIT 0x01
587 #define MBF_MNTLSTLOCK 0x02
588 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
589
590 #ifdef MALLOC_DECLARE
591 MALLOC_DECLARE(M_MOUNT);
592 #endif
593 extern int maxvfsconf; /* highest defined filesystem type */
594 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
595
596 TAILQ_HEAD(vfsconfhead, vfsconf);
597 extern struct vfsconfhead vfsconf;
598
599 /*
600 * Operations supported on mounted filesystem.
601 */
602 struct mount_args;
603 struct nameidata;
604 struct sysctl_req;
605 struct mntarg;
606
607 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
608 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
609 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
610 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
611 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
612 typedef int vfs_sync_t(struct mount *mp, int waitfor);
613 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
614 struct vnode **vpp);
615 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
616 int flags, struct vnode **vpp);
617 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
618 int *extflagsp, struct ucred **credanonp,
619 int *numsecflavors, int **secflavors);
620 typedef int vfs_init_t(struct vfsconf *);
621 typedef int vfs_uninit_t(struct vfsconf *);
622 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
623 struct vnode *filename_vp, int attrnamespace,
624 const char *attrname);
625 typedef int vfs_mount_t(struct mount *mp);
626 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
627 struct sysctl_req *req);
628 typedef void vfs_susp_clean_t(struct mount *mp);
629
630 struct vfsops {
631 vfs_mount_t *vfs_mount;
632 vfs_cmount_t *vfs_cmount;
633 vfs_unmount_t *vfs_unmount;
634 vfs_root_t *vfs_root;
635 vfs_quotactl_t *vfs_quotactl;
636 vfs_statfs_t *vfs_statfs;
637 vfs_sync_t *vfs_sync;
638 vfs_vget_t *vfs_vget;
639 vfs_fhtovp_t *vfs_fhtovp;
640 vfs_checkexp_t *vfs_checkexp;
641 vfs_init_t *vfs_init;
642 vfs_uninit_t *vfs_uninit;
643 vfs_extattrctl_t *vfs_extattrctl;
644 vfs_sysctl_t *vfs_sysctl;
645 vfs_susp_clean_t *vfs_susp_clean;
646 };
647
648 vfs_statfs_t __vfs_statfs;
649
650 #define VFS_MOUNT(MP) (*(MP)->mnt_op->vfs_mount)(MP)
651 #define VFS_UNMOUNT(MP, FORCE) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE)
652 #define VFS_ROOT(MP, FLAGS, VPP) \
653 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP)
654 #define VFS_QUOTACTL(MP, C, U, A) \
655 (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A)
656 #define VFS_STATFS(MP, SBP) __vfs_statfs((MP), (SBP))
657 #define VFS_SYNC(MP, WAIT) (*(MP)->mnt_op->vfs_sync)(MP, WAIT)
658 #define VFS_VGET(MP, INO, FLAGS, VPP) \
659 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
660 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) \
661 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP)
662 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) \
663 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC, SEC)
664 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) \
665 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N)
666 #define VFS_SYSCTL(MP, OP, REQ) \
667 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
668 #define VFS_SUSP_CLEAN(MP) \
669 ({if (*(MP)->mnt_op->vfs_susp_clean != NULL) \
670 (*(MP)->mnt_op->vfs_susp_clean)(MP); })
671
672 #define VFS_NEEDSGIANT_(MP) \
673 ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)
674
675 #define VFS_NEEDSGIANT(MP) __extension__ \
676 ({ \
677 struct mount *_mp; \
678 _mp = (MP); \
679 VFS_NEEDSGIANT_(_mp); \
680 })
681
682 #define VFS_LOCK_GIANT(MP) __extension__ \
683 ({ \
684 int _locked; \
685 struct mount *_mp; \
686 _mp = (MP); \
687 if (VFS_NEEDSGIANT_(_mp)) { \
688 mtx_lock(&Giant); \
689 _locked = 1; \
690 } else \
691 _locked = 0; \
692 _locked; \
693 })
694 #define VFS_UNLOCK_GIANT(locked) do \
695 { \
696 if ((locked)) \
697 mtx_unlock(&Giant); \
698 } while (0)
699 #define VFS_ASSERT_GIANT(MP) do \
700 { \
701 struct mount *_mp; \
702 _mp = (MP); \
703 if (VFS_NEEDSGIANT_(_mp)) \
704 mtx_assert(&Giant, MA_OWNED); \
705 } while (0)
706
707 #define VFS_KNOTE_LOCKED(vp, hint) do \
708 { \
709 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
710 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
711 } while (0)
712
713 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
714 { \
715 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
716 VN_KNOTE((vp), (hint), 0); \
717 } while (0)
718
719 #include <sys/module.h>
720
721 /*
722 * Version numbers.
723 */
724 #define VFS_VERSION_00 0x19660120
725 #define VFS_VERSION VFS_VERSION_00
726
727 #define VFS_SET(vfsops, fsname, flags) \
728 static struct vfsconf fsname ## _vfsconf = { \
729 .vfc_version = VFS_VERSION, \
730 .vfc_name = #fsname, \
731 .vfc_vfsops = &vfsops, \
732 .vfc_typenum = -1, \
733 .vfc_flags = flags, \
734 }; \
735 static moduledata_t fsname ## _mod = { \
736 #fsname, \
737 vfs_modevent, \
738 & fsname ## _vfsconf \
739 }; \
740 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
741
742 extern char *mountrootfsname;
743
744 /*
745 * exported vnode operations
746 */
747
748 int dounmount(struct mount *, int, struct thread *);
749
750 int kernel_mount(struct mntarg *ma, uint64_t flags);
751 int kernel_vmount(int flags, ...);
752 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
753 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
754 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
755 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
756 void statfs_scale_blocks(struct statfs *sf, long max_size);
757 struct vfsconf *vfs_byname(const char *);
758 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
759 void vfs_mount_destroy(struct mount *);
760 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
761 void vfs_freeopts(struct vfsoptlist *opts);
762 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
763 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
764 int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
765 uint64_t val);
766 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
767 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
768 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
769 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
770 int vfs_filteropt(struct vfsoptlist *, const char **legal);
771 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
772 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
773 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
774 int len);
775 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
776 int len);
777 int vfs_setopts(struct vfsoptlist *opts, const char *name,
778 const char *value);
779 int vfs_setpublicfs /* set publicly exported fs */
780 (struct mount *, struct netexport *, struct export_args *);
781 void vfs_msync(struct mount *, int);
782 int vfs_busy(struct mount *, int);
783 int vfs_export /* process mount export info */
784 (struct mount *, struct export_args *);
785 void vfs_allocate_syncvnode(struct mount *);
786 void vfs_deallocate_syncvnode(struct mount *);
787 int vfs_donmount(struct thread *td, uint64_t fsflags,
788 struct uio *fsoptions);
789 void vfs_getnewfsid(struct mount *);
790 struct cdev *vfs_getrootfsid(struct mount *);
791 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
792 struct mount *vfs_busyfs(fsid_t *);
793 int vfs_modevent(module_t, int, void *);
794 void vfs_mount_error(struct mount *, const char *, ...);
795 void vfs_mountroot(void); /* mount our root filesystem */
796 void vfs_mountedfrom(struct mount *, const char *from);
797 void vfs_oexport_conv(const struct oexport_args *oexp,
798 struct export_args *exp);
799 void vfs_ref(struct mount *);
800 void vfs_rel(struct mount *);
801 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
802 struct ucred *);
803 int vfs_suser(struct mount *, struct thread *);
804 void vfs_unbusy(struct mount *);
805 void vfs_unmountall(void);
806 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
807 extern struct mtx mountlist_mtx;
808 extern struct nfs_public nfs_pub;
809
810 /*
811 * Declarations for these vfs default operations are located in
812 * kern/vfs_default.c, they should be used instead of making "dummy"
813 * functions or casting entries in the VFS op table to "enopnotsupp()".
814 */
815 vfs_root_t vfs_stdroot;
816 vfs_quotactl_t vfs_stdquotactl;
817 vfs_statfs_t vfs_stdstatfs;
818 vfs_sync_t vfs_stdsync;
819 vfs_sync_t vfs_stdnosync;
820 vfs_vget_t vfs_stdvget;
821 vfs_fhtovp_t vfs_stdfhtovp;
822 vfs_checkexp_t vfs_stdcheckexp;
823 vfs_init_t vfs_stdinit;
824 vfs_uninit_t vfs_stduninit;
825 vfs_extattrctl_t vfs_stdextattrctl;
826 vfs_sysctl_t vfs_stdsysctl;
827
828 #else /* !_KERNEL */
829
830 #include <sys/cdefs.h>
831
832 struct stat;
833
834 __BEGIN_DECLS
835 int fhopen(const struct fhandle *, int);
836 int fhstat(const struct fhandle *, struct stat *);
837 int fhstatfs(const struct fhandle *, struct statfs *);
838 int fstatfs(int, struct statfs *);
839 int getfh(const char *, fhandle_t *);
840 int getfsstat(struct statfs *, long, int);
841 int getmntinfo(struct statfs **, int);
842 int lgetfh(const char *, fhandle_t *);
843 int mount(const char *, const char *, int, void *);
844 int nmount(struct iovec *, unsigned int, int);
845 int statfs(const char *, struct statfs *);
846 int unmount(const char *, int);
847
848 /* C library stuff */
849 int getvfsbyname(const char *, struct xvfsconf *);
850 __END_DECLS
851
852 #endif /* _KERNEL */
853
854 #endif /* !_SYS_MOUNT_H_ */
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