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/11.1/sys/sys/mount.h 311957 2017-01-12 01:09:15Z kib $
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 #include <sys/_sx.h>
43 #endif
44
45 /*
46 * NOTE: When changing statfs structure, mount structure, MNT_* flags or
47 * MNTK_* flags also update DDB show mount command in vfs_subr.c.
48 */
49
50 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
51
52 /*
53 * File identifier.
54 * These are unique per filesystem on a single machine.
55 */
56 #define MAXFIDSZ 16
57
58 struct fid {
59 u_short fid_len; /* length of data in bytes */
60 u_short fid_data0; /* force longword alignment */
61 char fid_data[MAXFIDSZ]; /* data (variable length) */
62 };
63
64 /*
65 * filesystem statistics
66 */
67 #define MFSNAMELEN 16 /* length of type name including null */
68 #define MNAMELEN 88 /* size of on/from name bufs */
69 #define STATFS_VERSION 0x20030518 /* current version number */
70 struct statfs {
71 uint32_t f_version; /* structure version number */
72 uint32_t f_type; /* type of filesystem */
73 uint64_t f_flags; /* copy of mount exported flags */
74 uint64_t f_bsize; /* filesystem fragment size */
75 uint64_t f_iosize; /* optimal transfer block size */
76 uint64_t f_blocks; /* total data blocks in filesystem */
77 uint64_t f_bfree; /* free blocks in filesystem */
78 int64_t f_bavail; /* free blocks avail to non-superuser */
79 uint64_t f_files; /* total file nodes in filesystem */
80 int64_t f_ffree; /* free nodes avail to non-superuser */
81 uint64_t f_syncwrites; /* count of sync writes since mount */
82 uint64_t f_asyncwrites; /* count of async writes since mount */
83 uint64_t f_syncreads; /* count of sync reads since mount */
84 uint64_t f_asyncreads; /* count of async reads since mount */
85 uint64_t f_spare[10]; /* unused spare */
86 uint32_t f_namemax; /* maximum filename length */
87 uid_t f_owner; /* user that mounted the filesystem */
88 fsid_t f_fsid; /* filesystem id */
89 char f_charspare[80]; /* spare string space */
90 char f_fstypename[MFSNAMELEN]; /* filesystem type name */
91 char f_mntfromname[MNAMELEN]; /* mounted filesystem */
92 char f_mntonname[MNAMELEN]; /* directory on which mounted */
93 };
94
95 #ifdef _KERNEL
96 #define OMFSNAMELEN 16 /* length of fs type name, including null */
97 #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
98
99 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
100 /* XXX statfs.2 is out of date with read counter changes here. */
101 struct ostatfs {
102 long f_spare2; /* placeholder */
103 long f_bsize; /* fundamental filesystem block size */
104 long f_iosize; /* optimal transfer block size */
105 long f_blocks; /* total data blocks in filesystem */
106 long f_bfree; /* free blocks in fs */
107 long f_bavail; /* free blocks avail to non-superuser */
108 long f_files; /* total file nodes in filesystem */
109 long f_ffree; /* free file nodes in fs */
110 fsid_t f_fsid; /* filesystem id */
111 uid_t f_owner; /* user that mounted the filesystem */
112 int f_type; /* type of filesystem */
113 int f_flags; /* copy of mount exported flags */
114 long f_syncwrites; /* count of sync writes since mount */
115 long f_asyncwrites; /* count of async writes since mount */
116 char f_fstypename[OMFSNAMELEN]; /* fs type name */
117 char f_mntonname[OMNAMELEN]; /* directory on which mounted */
118 long f_syncreads; /* count of sync reads since mount */
119 long f_asyncreads; /* count of async reads since mount */
120 short f_spares1; /* unused spare */
121 char f_mntfromname[OMNAMELEN];/* mounted filesystem */
122 short f_spares2; /* unused spare */
123 /*
124 * XXX on machines where longs are aligned to 8-byte boundaries, there
125 * is an unnamed int32_t here. This spare was after the apparent end
126 * of the struct until we bit off the read counters from f_mntonname.
127 */
128 long f_spare[2]; /* unused spare */
129 };
130
131 TAILQ_HEAD(vnodelst, vnode);
132
133 /* Mount options list */
134 TAILQ_HEAD(vfsoptlist, vfsopt);
135 struct vfsopt {
136 TAILQ_ENTRY(vfsopt) link;
137 char *name;
138 void *value;
139 int len;
140 int pos;
141 int seen;
142 };
143
144 /*
145 * Structure per mounted filesystem. Each mounted filesystem has an
146 * array of operations and an instance record. The filesystems are
147 * put on a doubly linked list.
148 *
149 * Lock reference:
150 * m - mountlist_mtx
151 * i - interlock
152 * v - vnode freelist mutex
153 *
154 * Unmarked fields are considered stable as long as a ref is held.
155 *
156 */
157 struct mount {
158 struct mtx mnt_mtx; /* mount structure interlock */
159 int mnt_gen; /* struct mount generation */
160 #define mnt_startzero mnt_list
161 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
162 struct vfsops *mnt_op; /* operations on fs */
163 struct vfsconf *mnt_vfc; /* configuration info */
164 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
165 struct vnode *mnt_syncer; /* syncer vnode */
166 int mnt_ref; /* (i) Reference count */
167 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
168 int mnt_nvnodelistsize; /* (i) # of vnodes */
169 struct vnodelst mnt_activevnodelist; /* (v) list of active vnodes */
170 int mnt_activevnodelistsize;/* (v) # of active vnodes */
171 int mnt_writeopcount; /* (i) write syscalls pending */
172 int mnt_kern_flag; /* (i) kernel only flags */
173 uint64_t mnt_flag; /* (i) flags shared with user */
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 TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */
193 TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/
194 };
195
196 /*
197 * Definitions for MNT_VNODE_FOREACH_ALL.
198 */
199 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
200 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
201 void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
202
203 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \
204 for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \
205 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
206
207 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \
208 do { \
209 MNT_ILOCK(mp); \
210 __mnt_vnode_markerfree_all(&(mvp), (mp)); \
211 /* MNT_IUNLOCK(mp); -- done in above function */ \
212 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
213 } while (0)
214
215 /*
216 * Definitions for MNT_VNODE_FOREACH_ACTIVE.
217 */
218 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
219 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
220 void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
221
222 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \
223 for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \
224 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
225
226 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \
227 __mnt_vnode_markerfree_active(&(mvp), (mp))
228
229 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
230 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
231 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
232 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
233 #define MNT_REF(mp) (mp)->mnt_ref++
234 #define MNT_REL(mp) do { \
235 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
236 (mp)->mnt_ref--; \
237 if ((mp)->mnt_ref == 0) \
238 wakeup((mp)); \
239 } while (0)
240
241 #endif /* _KERNEL */
242
243 /*
244 * User specifiable flags, stored in mnt_flag.
245 */
246 #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */
247 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
248 #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */
249 #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */
250 #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */
251 #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */
252 #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */
253 #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */
254 #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */
255 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
256 #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */
257 #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */
258 #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */
259 #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */
260 #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */
261 #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */
262 #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */
263 #define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */
264
265 /*
266 * NFS export related mount flags.
267 */
268 #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */
269 #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */
270 #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */
271 #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */
272 #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */
273 #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */
274
275 /*
276 * Flags set by internal operations,
277 * but visible to the user.
278 * XXX some of these are not quite right.. (I've never seen the root flag set)
279 */
280 #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */
281 #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */
282 #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */
283 #define MNT_USER 0x0000000000008000ULL /* mounted by a user */
284 #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */
285
286 /*
287 * Mask of flags that are visible to statfs().
288 * XXX I think that this could now become (~(MNT_CMDFLAGS))
289 * but the 'mount' program may need changing to handle this.
290 */
291 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
292 MNT_NOSUID | MNT_UNION | MNT_SUJ | \
293 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
294 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
295 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
296 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
297 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
298 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
299 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \
300 MNT_NFS4ACLS | MNT_AUTOMOUNTED)
301
302 /* Mask of flags that can be updated. */
303 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
304 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
305 MNT_NOATIME | \
306 MNT_NOSYMFOLLOW | MNT_IGNORE | \
307 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
308 MNT_ACLS | MNT_USER | MNT_NFS4ACLS | \
309 MNT_AUTOMOUNTED)
310
311 /*
312 * External filesystem command modifier flags.
313 * Unmount can use the MNT_FORCE flag.
314 * XXX: These are not STATES and really should be somewhere else.
315 * XXX: MNT_BYFSID and MNT_NONBUSY collide with MNT_ACLS and MNT_MULTILABEL,
316 * but because MNT_ACLS and MNT_MULTILABEL are only used for mount(2),
317 * and MNT_BYFSID and MNT_NONBUSY are only used for unmount(2),
318 * it's harmless.
319 */
320 #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */
321 #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */
322 #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */
323 #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */
324 #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */
325 #define MNT_NONBUSY 0x0000000004000000ULL /* check vnode use counts. */
326 #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */
327 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
328 MNT_FORCE | MNT_SNAPSHOT | MNT_NONBUSY | \
329 MNT_BYFSID)
330 /*
331 * Internal filesystem control flags stored in mnt_kern_flag.
332 *
333 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
334 * past the mount point. This keeps the subtree stable during mounts
335 * and unmounts.
336 *
337 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
338 * dounmount() is still waiting to lock the mountpoint. This allows
339 * the filesystem to cancel operations that might otherwise deadlock
340 * with the unmount attempt (used by NFS).
341 *
342 * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
343 * to allow for failed unmount attempt to restore the syncer vnode for
344 * the mount.
345 */
346 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
347 #define MNTK_ASYNC 0x00000002 /* filtered async flag */
348 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
349 #define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */
350 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */
351 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
352 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
353 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
354 #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads
355 and writes. Filesystem shall properly
356 handle i/o state on EFAULT. */
357 #define MNTK_VGONE_UPPER 0x00000200
358 #define MNTK_VGONE_WAITER 0x00000400
359 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
360 #define MNTK_MARKER 0x00001000
361 #define MNTK_UNMAPPED_BUFS 0x00002000
362 #define MNTK_USES_BCACHE 0x00004000 /* FS uses the buffer cache. */
363 #define MNTK_NOASYNC 0x00800000 /* disable async */
364 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
365 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
366 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
367 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
368 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
369 #define MNTK_NULL_NOCACHE 0x20000000 /* auto disable cache for nullfs
370 mounts over this fs */
371 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
372 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
373
374 #ifdef _KERNEL
375 static inline int
376 MNT_SHARED_WRITES(struct mount *mp)
377 {
378
379 return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
380 }
381
382 static inline int
383 MNT_EXTENDED_SHARED(struct mount *mp)
384 {
385
386 return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
387 }
388 #endif
389
390 /*
391 * Sysctl CTL_VFS definitions.
392 *
393 * Second level identifier specifies which filesystem. Second level
394 * identifier VFS_VFSCONF returns information about all filesystems.
395 * Second level identifier VFS_GENERIC is non-terminal.
396 */
397 #define VFS_VFSCONF 0 /* get configured filesystems */
398 #define VFS_GENERIC 0 /* generic filesystem information */
399 /*
400 * Third level identifiers for VFS_GENERIC are given below; third
401 * level identifiers for specific filesystems are given in their
402 * mount specific header files.
403 */
404 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
405 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
406 as next argument */
407
408 /*
409 * Flags for various system call interfaces.
410 *
411 * waitfor flags to vfs_sync() and getfsstat()
412 */
413 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
414 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
415 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
416 #define MNT_SUSPEND 4 /* Suspend file system after sync */
417
418 /*
419 * Generic file handle
420 */
421 struct fhandle {
422 fsid_t fh_fsid; /* Filesystem id of mount point */
423 struct fid fh_fid; /* Filesys specific id */
424 };
425 typedef struct fhandle fhandle_t;
426
427 /*
428 * Old export arguments without security flavor list
429 */
430 struct oexport_args {
431 int ex_flags; /* export related flags */
432 uid_t ex_root; /* mapping for root uid */
433 struct xucred ex_anon; /* mapping for anonymous user */
434 struct sockaddr *ex_addr; /* net address to which exported */
435 u_char ex_addrlen; /* and the net address length */
436 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
437 u_char ex_masklen; /* and the smask length */
438 char *ex_indexfile; /* index file for WebNFS URLs */
439 };
440
441 /*
442 * Export arguments for local filesystem mount calls.
443 */
444 #define MAXSECFLAVORS 5
445 struct export_args {
446 int ex_flags; /* export related flags */
447 uid_t ex_root; /* mapping for root uid */
448 struct xucred ex_anon; /* mapping for anonymous user */
449 struct sockaddr *ex_addr; /* net address to which exported */
450 u_char ex_addrlen; /* and the net address length */
451 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
452 u_char ex_masklen; /* and the smask length */
453 char *ex_indexfile; /* index file for WebNFS URLs */
454 int ex_numsecflavors; /* security flavor count */
455 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
456 };
457
458 /*
459 * Structure holding information for a publicly exported filesystem
460 * (WebNFS). Currently the specs allow just for one such filesystem.
461 */
462 struct nfs_public {
463 int np_valid; /* Do we hold valid information */
464 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
465 struct mount *np_mount; /* Mountpoint of exported fs */
466 char *np_index; /* Index file */
467 };
468
469 /*
470 * Filesystem configuration information. One of these exists for each
471 * type of filesystem supported by the kernel. These are searched at
472 * mount time to identify the requested filesystem.
473 *
474 * XXX: Never change the first two arguments!
475 */
476 struct vfsconf {
477 u_int vfc_version; /* ABI version number */
478 char vfc_name[MFSNAMELEN]; /* filesystem type name */
479 struct vfsops *vfc_vfsops; /* filesystem operations vector */
480 int vfc_typenum; /* historic filesystem type number */
481 int vfc_refcount; /* number mounted of this type */
482 int vfc_flags; /* permanent flags */
483 struct vfsoptdecl *vfc_opts; /* mount options */
484 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
485 };
486
487 /* Userland version of the struct vfsconf. */
488 struct xvfsconf {
489 struct vfsops *vfc_vfsops; /* filesystem operations vector */
490 char vfc_name[MFSNAMELEN]; /* filesystem type name */
491 int vfc_typenum; /* historic filesystem type number */
492 int vfc_refcount; /* number mounted of this type */
493 int vfc_flags; /* permanent flags */
494 struct vfsconf *vfc_next; /* next in list */
495 };
496
497 #ifndef BURN_BRIDGES
498 struct ovfsconf {
499 void *vfc_vfsops;
500 char vfc_name[32];
501 int vfc_index;
502 int vfc_refcount;
503 int vfc_flags;
504 };
505 #endif
506
507 /*
508 * NB: these flags refer to IMPLEMENTATION properties, not properties of
509 * any actual mounts; i.e., it does not make sense to change the flags.
510 */
511 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
512 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
513 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
514 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
515 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
516 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
517 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
518 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
519 #define VFCF_SBDRY 0x01000000 /* defer stop requests */
520
521 typedef uint32_t fsctlop_t;
522
523 struct vfsidctl {
524 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
525 fsid_t vc_fsid; /* fsid to operate on */
526 char vc_fstypename[MFSNAMELEN];
527 /* type of fs 'nfs' or '*' */
528 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
529 void *vc_ptr; /* pointer to data structure */
530 size_t vc_len; /* sizeof said structure */
531 u_int32_t vc_spare[12]; /* spare (must be zero) */
532 };
533
534 /* vfsidctl API version. */
535 #define VFS_CTL_VERS1 0x01
536
537 /*
538 * New style VFS sysctls, do not reuse/conflict with the namespace for
539 * private sysctls.
540 * All "global" sysctl ops have the 33rd bit set:
541 * 0x...1....
542 * Private sysctl ops should have the 33rd bit unset.
543 */
544 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
545 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
546 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
547
548 struct vfsquery {
549 u_int32_t vq_flags;
550 u_int32_t vq_spare[31];
551 };
552
553 /* vfsquery flags */
554 #define VQ_NOTRESP 0x0001 /* server down */
555 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
556 #define VQ_LOWDISK 0x0004 /* we're low on space */
557 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
558 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
559 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
560 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
561 program */
562 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
563 #define VQ_FLAG0100 0x0100 /* placeholder */
564 #define VQ_FLAG0200 0x0200 /* placeholder */
565 #define VQ_FLAG0400 0x0400 /* placeholder */
566 #define VQ_FLAG0800 0x0800 /* placeholder */
567 #define VQ_FLAG1000 0x1000 /* placeholder */
568 #define VQ_FLAG2000 0x2000 /* placeholder */
569 #define VQ_FLAG4000 0x4000 /* placeholder */
570 #define VQ_FLAG8000 0x8000 /* placeholder */
571
572 #ifdef _KERNEL
573 /* Point a sysctl request at a vfsidctl's data. */
574 #define VCTLTOREQ(vc, req) \
575 do { \
576 (req)->newptr = (vc)->vc_ptr; \
577 (req)->newlen = (vc)->vc_len; \
578 (req)->newidx = 0; \
579 } while (0)
580 #endif
581
582 struct iovec;
583 struct uio;
584
585 #ifdef _KERNEL
586
587 /*
588 * vfs_busy specific flags and mask.
589 */
590 #define MBF_NOWAIT 0x01
591 #define MBF_MNTLSTLOCK 0x02
592 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
593
594 #ifdef MALLOC_DECLARE
595 MALLOC_DECLARE(M_MOUNT);
596 MALLOC_DECLARE(M_STATFS);
597 #endif
598 extern int maxvfsconf; /* highest defined filesystem type */
599
600 TAILQ_HEAD(vfsconfhead, vfsconf);
601 extern struct vfsconfhead vfsconf;
602
603 /*
604 * Operations supported on mounted filesystem.
605 */
606 struct mount_args;
607 struct nameidata;
608 struct sysctl_req;
609 struct mntarg;
610
611 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
612 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
613 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
614 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
615 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
616 typedef int vfs_sync_t(struct mount *mp, int waitfor);
617 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
618 struct vnode **vpp);
619 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
620 int flags, struct vnode **vpp);
621 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
622 int *extflagsp, struct ucred **credanonp,
623 int *numsecflavors, int **secflavors);
624 typedef int vfs_init_t(struct vfsconf *);
625 typedef int vfs_uninit_t(struct vfsconf *);
626 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
627 struct vnode *filename_vp, int attrnamespace,
628 const char *attrname);
629 typedef int vfs_mount_t(struct mount *mp);
630 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
631 struct sysctl_req *req);
632 typedef void vfs_susp_clean_t(struct mount *mp);
633 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
634 typedef void vfs_purge_t(struct mount *mp);
635
636 struct vfsops {
637 vfs_mount_t *vfs_mount;
638 vfs_cmount_t *vfs_cmount;
639 vfs_unmount_t *vfs_unmount;
640 vfs_root_t *vfs_root;
641 vfs_quotactl_t *vfs_quotactl;
642 vfs_statfs_t *vfs_statfs;
643 vfs_sync_t *vfs_sync;
644 vfs_vget_t *vfs_vget;
645 vfs_fhtovp_t *vfs_fhtovp;
646 vfs_checkexp_t *vfs_checkexp;
647 vfs_init_t *vfs_init;
648 vfs_uninit_t *vfs_uninit;
649 vfs_extattrctl_t *vfs_extattrctl;
650 vfs_sysctl_t *vfs_sysctl;
651 vfs_susp_clean_t *vfs_susp_clean;
652 vfs_notify_lowervp_t *vfs_reclaim_lowervp;
653 vfs_notify_lowervp_t *vfs_unlink_lowervp;
654 vfs_purge_t *vfs_purge;
655 vfs_mount_t *vfs_spare[6]; /* spares for ABI compat */
656 };
657
658 vfs_statfs_t __vfs_statfs;
659
660 #define VFS_PROLOGUE(MP) do { \
661 struct mount *mp__; \
662 int _prev_stops; \
663 \
664 mp__ = (MP); \
665 _prev_stops = sigdeferstop((mp__ != NULL && \
666 (mp__->mnt_vfc->vfc_flags & VFCF_SBDRY) != 0) ? \
667 SIGDEFERSTOP_SILENT : SIGDEFERSTOP_NOP);
668
669 #define VFS_EPILOGUE(MP) \
670 sigallowstop(_prev_stops); \
671 } while (0)
672
673 #define VFS_MOUNT(MP) ({ \
674 int _rc; \
675 \
676 VFS_PROLOGUE(MP); \
677 _rc = (*(MP)->mnt_op->vfs_mount)(MP); \
678 VFS_EPILOGUE(MP); \
679 _rc; })
680
681 #define VFS_UNMOUNT(MP, FORCE) ({ \
682 int _rc; \
683 \
684 VFS_PROLOGUE(MP); \
685 _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \
686 VFS_EPILOGUE(MP); \
687 _rc; })
688
689 #define VFS_ROOT(MP, FLAGS, VPP) ({ \
690 int _rc; \
691 \
692 VFS_PROLOGUE(MP); \
693 _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \
694 VFS_EPILOGUE(MP); \
695 _rc; })
696
697 #define VFS_QUOTACTL(MP, C, U, A) ({ \
698 int _rc; \
699 \
700 VFS_PROLOGUE(MP); \
701 _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A); \
702 VFS_EPILOGUE(MP); \
703 _rc; })
704
705 #define VFS_STATFS(MP, SBP) ({ \
706 int _rc; \
707 \
708 VFS_PROLOGUE(MP); \
709 _rc = __vfs_statfs((MP), (SBP)); \
710 VFS_EPILOGUE(MP); \
711 _rc; })
712
713 #define VFS_SYNC(MP, WAIT) ({ \
714 int _rc; \
715 \
716 VFS_PROLOGUE(MP); \
717 _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \
718 VFS_EPILOGUE(MP); \
719 _rc; })
720
721 #define VFS_VGET(MP, INO, FLAGS, VPP) ({ \
722 int _rc; \
723 \
724 VFS_PROLOGUE(MP); \
725 _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \
726 VFS_EPILOGUE(MP); \
727 _rc; })
728
729 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({ \
730 int _rc; \
731 \
732 VFS_PROLOGUE(MP); \
733 _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP); \
734 VFS_EPILOGUE(MP); \
735 _rc; })
736
737 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \
738 int _rc; \
739 \
740 VFS_PROLOGUE(MP); \
741 _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
742 SEC); \
743 VFS_EPILOGUE(MP); \
744 _rc; })
745
746 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \
747 int _rc; \
748 \
749 VFS_PROLOGUE(MP); \
750 _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \
751 VFS_EPILOGUE(MP); \
752 _rc; })
753
754 #define VFS_SYSCTL(MP, OP, REQ) ({ \
755 int _rc; \
756 \
757 VFS_PROLOGUE(MP); \
758 _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \
759 VFS_EPILOGUE(MP); \
760 _rc; })
761
762 #define VFS_SUSP_CLEAN(MP) do { \
763 if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \
764 VFS_PROLOGUE(MP); \
765 (*(MP)->mnt_op->vfs_susp_clean)(MP); \
766 VFS_EPILOGUE(MP); \
767 } \
768 } while (0)
769
770 #define VFS_RECLAIM_LOWERVP(MP, VP) do { \
771 if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \
772 VFS_PROLOGUE(MP); \
773 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \
774 VFS_EPILOGUE(MP); \
775 } \
776 } while (0)
777
778 #define VFS_UNLINK_LOWERVP(MP, VP) do { \
779 if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) { \
780 VFS_PROLOGUE(MP); \
781 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP)); \
782 VFS_EPILOGUE(MP); \
783 } \
784 } while (0)
785
786 #define VFS_PURGE(MP) do { \
787 if (*(MP)->mnt_op->vfs_purge != NULL) { \
788 VFS_PROLOGUE(MP); \
789 (*(MP)->mnt_op->vfs_purge)(MP); \
790 VFS_EPILOGUE(MP); \
791 } \
792 } while (0)
793
794 #define VFS_KNOTE_LOCKED(vp, hint) do \
795 { \
796 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
797 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
798 } while (0)
799
800 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
801 { \
802 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
803 VN_KNOTE((vp), (hint), 0); \
804 } while (0)
805
806 #define VFS_NOTIFY_UPPER_RECLAIM 1
807 #define VFS_NOTIFY_UPPER_UNLINK 2
808
809 #include <sys/module.h>
810
811 /*
812 * Version numbers.
813 */
814 #define VFS_VERSION_00 0x19660120
815 #define VFS_VERSION_01 0x20121030
816 #define VFS_VERSION VFS_VERSION_01
817
818 #define VFS_SET(vfsops, fsname, flags) \
819 static struct vfsconf fsname ## _vfsconf = { \
820 .vfc_version = VFS_VERSION, \
821 .vfc_name = #fsname, \
822 .vfc_vfsops = &vfsops, \
823 .vfc_typenum = -1, \
824 .vfc_flags = flags, \
825 }; \
826 static moduledata_t fsname ## _mod = { \
827 #fsname, \
828 vfs_modevent, \
829 & fsname ## _vfsconf \
830 }; \
831 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
832
833 /*
834 * exported vnode operations
835 */
836
837 int dounmount(struct mount *, int, struct thread *);
838
839 int kernel_mount(struct mntarg *ma, uint64_t flags);
840 int kernel_vmount(int flags, ...);
841 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
842 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
843 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
844 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
845 void statfs_scale_blocks(struct statfs *sf, long max_size);
846 struct vfsconf *vfs_byname(const char *);
847 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
848 void vfs_mount_destroy(struct mount *);
849 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
850 void vfs_freeopts(struct vfsoptlist *opts);
851 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
852 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
853 int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
854 uint64_t val);
855 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
856 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
857 int vfs_getopt_size(struct vfsoptlist *opts, const char *name,
858 off_t *value);
859 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
860 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
861 int vfs_filteropt(struct vfsoptlist *, const char **legal);
862 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
863 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
864 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
865 int len);
866 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
867 int len);
868 int vfs_setopts(struct vfsoptlist *opts, const char *name,
869 const char *value);
870 int vfs_setpublicfs /* set publicly exported fs */
871 (struct mount *, struct netexport *, struct export_args *);
872 void vfs_msync(struct mount *, int);
873 int vfs_busy(struct mount *, int);
874 int vfs_export /* process mount export info */
875 (struct mount *, struct export_args *);
876 void vfs_allocate_syncvnode(struct mount *);
877 void vfs_deallocate_syncvnode(struct mount *);
878 int vfs_donmount(struct thread *td, uint64_t fsflags,
879 struct uio *fsoptions);
880 void vfs_getnewfsid(struct mount *);
881 struct cdev *vfs_getrootfsid(struct mount *);
882 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
883 struct mount *vfs_busyfs(fsid_t *);
884 int vfs_modevent(module_t, int, void *);
885 void vfs_mount_error(struct mount *, const char *, ...);
886 void vfs_mountroot(void); /* mount our root filesystem */
887 void vfs_mountedfrom(struct mount *, const char *from);
888 void vfs_notify_upper(struct vnode *, int);
889 void vfs_oexport_conv(const struct oexport_args *oexp,
890 struct export_args *exp);
891 void vfs_ref(struct mount *);
892 void vfs_rel(struct mount *);
893 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
894 struct ucred *);
895 int vfs_suser(struct mount *, struct thread *);
896 void vfs_unbusy(struct mount *);
897 void vfs_unmountall(void);
898 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
899 extern struct mtx mountlist_mtx;
900 extern struct nfs_public nfs_pub;
901 extern struct sx vfsconf_sx;
902 #define vfsconf_lock() sx_xlock(&vfsconf_sx)
903 #define vfsconf_unlock() sx_xunlock(&vfsconf_sx)
904 #define vfsconf_slock() sx_slock(&vfsconf_sx)
905 #define vfsconf_sunlock() sx_sunlock(&vfsconf_sx)
906
907 /*
908 * Declarations for these vfs default operations are located in
909 * kern/vfs_default.c. They will be automatically used to replace
910 * null entries in VFS ops tables when registering a new filesystem
911 * type in the global table.
912 */
913 vfs_root_t vfs_stdroot;
914 vfs_quotactl_t vfs_stdquotactl;
915 vfs_statfs_t vfs_stdstatfs;
916 vfs_sync_t vfs_stdsync;
917 vfs_sync_t vfs_stdnosync;
918 vfs_vget_t vfs_stdvget;
919 vfs_fhtovp_t vfs_stdfhtovp;
920 vfs_checkexp_t vfs_stdcheckexp;
921 vfs_init_t vfs_stdinit;
922 vfs_uninit_t vfs_stduninit;
923 vfs_extattrctl_t vfs_stdextattrctl;
924 vfs_sysctl_t vfs_stdsysctl;
925
926 void syncer_suspend(void);
927 void syncer_resume(void);
928
929 #else /* !_KERNEL */
930
931 #include <sys/cdefs.h>
932
933 struct stat;
934
935 __BEGIN_DECLS
936 int fhopen(const struct fhandle *, int);
937 int fhstat(const struct fhandle *, struct stat *);
938 int fhstatfs(const struct fhandle *, struct statfs *);
939 int fstatfs(int, struct statfs *);
940 int getfh(const char *, fhandle_t *);
941 int getfsstat(struct statfs *, long, int);
942 int getmntinfo(struct statfs **, int);
943 int lgetfh(const char *, fhandle_t *);
944 int mount(const char *, const char *, int, void *);
945 int nmount(struct iovec *, unsigned int, int);
946 int statfs(const char *, struct statfs *);
947 int unmount(const char *, int);
948
949 /* C library stuff */
950 int getvfsbyname(const char *, struct xvfsconf *);
951 __END_DECLS
952
953 #endif /* _KERNEL */
954
955 #endif /* !_SYS_MOUNT_H_ */
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