1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed
8 * to Berkeley by John Heidemann of the UCLA Ficus project.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/fnv_hash.h>
38 #include <sys/jail.h>
39 #include <sys/kernel.h>
40 #include <sys/linker.h>
41 #include <sys/mount.h>
42 #include <sys/proc.h>
43 #include <sys/sx.h>
44 #include <sys/syscallsubr.h>
45 #include <sys/sysctl.h>
46 #include <sys/vnode.h>
47 #include <sys/malloc.h>
48
49 static int vfs_register(struct vfsconf *);
50 static int vfs_unregister(struct vfsconf *);
51
52 MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");
53
54 /*
55 * The highest defined VFS number.
56 */
57 int maxvfsconf = VFS_GENERIC + 1;
58
59 /*
60 * Single-linked list of configured VFSes.
61 * New entries are added/deleted by vfs_register()/vfs_unregister()
62 */
63 struct vfsconfhead vfsconf = TAILQ_HEAD_INITIALIZER(vfsconf);
64 struct sx vfsconf_sx;
65 SX_SYSINIT(vfsconf, &vfsconf_sx, "vfsconf");
66
67 /*
68 * Loader.conf variable vfs.typenumhash enables setting vfc_typenum using a hash
69 * calculation on vfc_name, so that it doesn't change when file systems are
70 * loaded in a different order. This will avoid the NFS server file handles from
71 * changing for file systems that use vfc_typenum in their fsid.
72 */
73 static int vfs_typenumhash = 1;
74 SYSCTL_INT(_vfs, OID_AUTO, typenumhash, CTLFLAG_RDTUN, &vfs_typenumhash, 0,
75 "Set vfc_typenum using a hash calculation on vfc_name, so that it does not"
76 " change when file systems are loaded in a different order.");
77
78 /*
79 * A Zen vnode attribute structure.
80 *
81 * Initialized when the first filesystem registers by vfs_register().
82 */
83 struct vattr va_null;
84
85 /*
86 * vfs_init.c
87 *
88 * Allocate and fill in operations vectors.
89 *
90 * An undocumented feature of this approach to defining operations is that
91 * there can be multiple entries in vfs_opv_descs for the same operations
92 * vector. This allows third parties to extend the set of operations
93 * supported by another layer in a binary compatibile way. For example,
94 * assume that NFS needed to be modified to support Ficus. NFS has an entry
95 * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by
96 * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions)
97 * listing those new operations Ficus adds to NFS, all without modifying the
98 * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but
99 * that is a(whole)nother story.) This is a feature.
100 */
101
102 /*
103 * Routines having to do with the management of the vnode table.
104 */
105
106 void
vfs_unref_vfsconf(struct vfsconf * vfsp)107 vfs_unref_vfsconf(struct vfsconf *vfsp)
108 {
109 vfsconf_lock();
110 KASSERT(vfsp->vfc_refcount > 0,
111 ("vfs %p refcount underflow %d", vfsp, vfsp->vfc_refcount));
112 vfsp->vfc_refcount--;
113 vfsconf_unlock();
114 }
115
116 static struct vfsconf *
vfs_byname_locked(const char * name)117 vfs_byname_locked(const char *name)
118 {
119 struct vfsconf *vfsp;
120
121 sx_assert(&vfsconf_sx, SA_LOCKED);
122 if (!strcmp(name, "ffs"))
123 name = "ufs";
124 TAILQ_FOREACH(vfsp, &vfsconf, vfc_list) {
125 if (!strcmp(name, vfsp->vfc_name))
126 return (vfsp);
127 }
128 return (NULL);
129 }
130
131 struct vfsconf *
vfs_byname(const char * name)132 vfs_byname(const char *name)
133 {
134 struct vfsconf *vfsp;
135
136 vfsconf_lock();
137 vfsp = vfs_byname_locked(name);
138 if (vfsp != NULL)
139 vfsp->vfc_refcount++;
140 vfsconf_unlock();
141 return (vfsp);
142 }
143
144 struct vfsconf *
vfs_byname_kld(const char * fstype,struct thread * td,int * error)145 vfs_byname_kld(const char *fstype, struct thread *td, int *error)
146 {
147 struct vfsconf *vfsp;
148 int fileid, loaded;
149
150 vfsp = vfs_byname(fstype);
151 if (vfsp != NULL)
152 return (vfsp);
153
154 /* Try to load the respective module. */
155 *error = kern_kldload(td, fstype, &fileid);
156 loaded = (*error == 0);
157 if (*error == EEXIST)
158 *error = 0;
159 if (*error) {
160 *error = ENODEV;
161 return (NULL);
162 }
163
164 /* Look up again to see if the VFS was loaded. */
165 vfsp = vfs_byname(fstype);
166 if (vfsp == NULL) {
167 if (loaded)
168 (void)kern_kldunload(td, fileid, LINKER_UNLOAD_FORCE);
169 *error = ENODEV;
170 return (NULL);
171 }
172 return (vfsp);
173 }
174
175 static int
vfs_mount_sigdefer(struct mount * mp)176 vfs_mount_sigdefer(struct mount *mp)
177 {
178 int prev_stops, rc;
179
180 TSRAW(curthread, TS_ENTER, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
181 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
182 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_mount)(mp);
183 sigallowstop(prev_stops);
184 TSRAW(curthread, TS_EXIT, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
185 return (rc);
186 }
187
188 static int
vfs_unmount_sigdefer(struct mount * mp,int mntflags)189 vfs_unmount_sigdefer(struct mount *mp, int mntflags)
190 {
191 int prev_stops, rc;
192
193 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
194 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unmount)(mp, mntflags);
195 sigallowstop(prev_stops);
196 return (rc);
197 }
198
199 static int
vfs_root_sigdefer(struct mount * mp,int flags,struct vnode ** vpp)200 vfs_root_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
201 {
202 int prev_stops, rc;
203
204 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
205 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_root)(mp, flags, vpp);
206 sigallowstop(prev_stops);
207 return (rc);
208 }
209
210 static int
vfs_cachedroot_sigdefer(struct mount * mp,int flags,struct vnode ** vpp)211 vfs_cachedroot_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
212 {
213 int prev_stops, rc;
214
215 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
216 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_cachedroot)(mp, flags, vpp);
217 sigallowstop(prev_stops);
218 return (rc);
219 }
220
221 static int
vfs_quotactl_sigdefer(struct mount * mp,int cmd,uid_t uid,void * arg,bool * mp_busy)222 vfs_quotactl_sigdefer(struct mount *mp, int cmd, uid_t uid, void *arg,
223 bool *mp_busy)
224 {
225 int prev_stops, rc;
226
227 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
228 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_quotactl)(mp, cmd, uid, arg,
229 mp_busy);
230 sigallowstop(prev_stops);
231 return (rc);
232 }
233
234 static int
vfs_statfs_sigdefer(struct mount * mp,struct statfs * sbp)235 vfs_statfs_sigdefer(struct mount *mp, struct statfs *sbp)
236 {
237 int prev_stops, rc;
238
239 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
240 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_statfs)(mp, sbp);
241 sigallowstop(prev_stops);
242 return (rc);
243 }
244
245 static int
vfs_sync_sigdefer(struct mount * mp,int waitfor)246 vfs_sync_sigdefer(struct mount *mp, int waitfor)
247 {
248 int prev_stops, rc;
249
250 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
251 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sync)(mp, waitfor);
252 sigallowstop(prev_stops);
253 return (rc);
254 }
255
256 static int
vfs_vget_sigdefer(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)257 vfs_vget_sigdefer(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
258 {
259 int prev_stops, rc;
260
261 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
262 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_vget)(mp, ino, flags, vpp);
263 sigallowstop(prev_stops);
264 return (rc);
265 }
266
267 static int
vfs_fhtovp_sigdefer(struct mount * mp,struct fid * fidp,int flags,struct vnode ** vpp)268 vfs_fhtovp_sigdefer(struct mount *mp, struct fid *fidp, int flags,
269 struct vnode **vpp)
270 {
271 int prev_stops, rc;
272
273 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
274 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_fhtovp)(mp, fidp, flags, vpp);
275 sigallowstop(prev_stops);
276 return (rc);
277 }
278
279 static int
vfs_checkexp_sigdefer(struct mount * mp,struct sockaddr * nam,uint64_t * exflg,struct ucred ** credp,int * numsecflavors,int * secflavors)280 vfs_checkexp_sigdefer(struct mount *mp, struct sockaddr *nam, uint64_t *exflg,
281 struct ucred **credp, int *numsecflavors, int *secflavors)
282 {
283 int prev_stops, rc;
284
285 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
286 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_checkexp)(mp, nam, exflg, credp,
287 numsecflavors, secflavors);
288 sigallowstop(prev_stops);
289 return (rc);
290 }
291
292 static int
vfs_extattrctl_sigdefer(struct mount * mp,int cmd,struct vnode * filename_vp,int attrnamespace,const char * attrname)293 vfs_extattrctl_sigdefer(struct mount *mp, int cmd, struct vnode *filename_vp,
294 int attrnamespace, const char *attrname)
295 {
296 int prev_stops, rc;
297
298 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
299 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_extattrctl)(mp, cmd,
300 filename_vp, attrnamespace, attrname);
301 sigallowstop(prev_stops);
302 return (rc);
303 }
304
305 static int
vfs_sysctl_sigdefer(struct mount * mp,fsctlop_t op,struct sysctl_req * req)306 vfs_sysctl_sigdefer(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
307 {
308 int prev_stops, rc;
309
310 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
311 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sysctl)(mp, op, req);
312 sigallowstop(prev_stops);
313 return (rc);
314 }
315
316 static void
vfs_susp_clean_sigdefer(struct mount * mp)317 vfs_susp_clean_sigdefer(struct mount *mp)
318 {
319 int prev_stops;
320
321 if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean == NULL)
322 return;
323 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
324 (*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean)(mp);
325 sigallowstop(prev_stops);
326 }
327
328 static void
vfs_reclaim_lowervp_sigdefer(struct mount * mp,struct vnode * vp)329 vfs_reclaim_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
330 {
331 int prev_stops;
332
333 if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp == NULL)
334 return;
335 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
336 (*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp)(mp, vp);
337 sigallowstop(prev_stops);
338 }
339
340 static void
vfs_unlink_lowervp_sigdefer(struct mount * mp,struct vnode * vp)341 vfs_unlink_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
342 {
343 int prev_stops;
344
345 if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp == NULL)
346 return;
347 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
348 (*(mp)->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp)(mp, vp);
349 sigallowstop(prev_stops);
350 }
351
352 static void
vfs_purge_sigdefer(struct mount * mp)353 vfs_purge_sigdefer(struct mount *mp)
354 {
355 int prev_stops;
356
357 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
358 (*mp->mnt_vfc->vfc_vfsops_sd->vfs_purge)(mp);
359 sigallowstop(prev_stops);
360 }
361
362 static int
vfs_report_lockf_sigdefer(struct mount * mp,struct sbuf * sb)363 vfs_report_lockf_sigdefer(struct mount *mp, struct sbuf *sb)
364 {
365 int prev_stops, rc;
366
367 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
368 rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_report_lockf)(mp, sb);
369 sigallowstop(prev_stops);
370 return (rc);
371 }
372
373 static struct vfsops vfsops_sigdefer = {
374 .vfs_mount = vfs_mount_sigdefer,
375 .vfs_unmount = vfs_unmount_sigdefer,
376 .vfs_root = vfs_root_sigdefer,
377 .vfs_cachedroot = vfs_cachedroot_sigdefer,
378 .vfs_quotactl = vfs_quotactl_sigdefer,
379 .vfs_statfs = vfs_statfs_sigdefer,
380 .vfs_sync = vfs_sync_sigdefer,
381 .vfs_vget = vfs_vget_sigdefer,
382 .vfs_fhtovp = vfs_fhtovp_sigdefer,
383 .vfs_checkexp = vfs_checkexp_sigdefer,
384 .vfs_extattrctl = vfs_extattrctl_sigdefer,
385 .vfs_sysctl = vfs_sysctl_sigdefer,
386 .vfs_susp_clean = vfs_susp_clean_sigdefer,
387 .vfs_reclaim_lowervp = vfs_reclaim_lowervp_sigdefer,
388 .vfs_unlink_lowervp = vfs_unlink_lowervp_sigdefer,
389 .vfs_purge = vfs_purge_sigdefer,
390 .vfs_report_lockf = vfs_report_lockf_sigdefer,
391 };
392
393 /* Register a new filesystem type in the global table */
394 static int
vfs_register(struct vfsconf * vfc)395 vfs_register(struct vfsconf *vfc)
396 {
397 struct sysctl_oid *oidp;
398 struct vfsops *vfsops;
399 static int once;
400 struct vfsconf *tvfc;
401 uint32_t hashval;
402 int secondpass;
403
404 if (!once) {
405 vattr_null(&va_null);
406 once = 1;
407 }
408
409 if (vfc->vfc_version != VFS_VERSION) {
410 printf("ERROR: filesystem %s, unsupported ABI version %x\n",
411 vfc->vfc_name, vfc->vfc_version);
412 return (EINVAL);
413 }
414 vfsconf_lock();
415 if (vfs_byname_locked(vfc->vfc_name) != NULL) {
416 vfsconf_unlock();
417 return (EEXIST);
418 }
419
420 if (vfs_typenumhash != 0) {
421 /*
422 * Calculate a hash on vfc_name to use for vfc_typenum. Unless
423 * all of 1<->255 are assigned, it is limited to 8bits since
424 * that is what ZFS uses from vfc_typenum and is also the
425 * preferred range for vfs_getnewfsid().
426 */
427 hashval = fnv_32_str(vfc->vfc_name, FNV1_32_INIT);
428 hashval &= 0xff;
429 secondpass = 0;
430 do {
431 /* Look for and fix any collision. */
432 TAILQ_FOREACH(tvfc, &vfsconf, vfc_list) {
433 if (hashval == tvfc->vfc_typenum) {
434 if (hashval == 255 && secondpass == 0) {
435 hashval = 1;
436 secondpass = 1;
437 } else
438 hashval++;
439 break;
440 }
441 }
442 } while (tvfc != NULL);
443 vfc->vfc_typenum = hashval;
444 if (vfc->vfc_typenum >= maxvfsconf)
445 maxvfsconf = vfc->vfc_typenum + 1;
446 } else
447 vfc->vfc_typenum = maxvfsconf++;
448 TAILQ_INSERT_TAIL(&vfsconf, vfc, vfc_list);
449
450 /*
451 * Initialise unused ``struct vfsops'' fields, to use
452 * the vfs_std*() functions. Note, we need the mount
453 * and unmount operations, at the least. The check
454 * for vfsops available is just a debugging aid.
455 */
456 KASSERT(vfc->vfc_vfsops != NULL,
457 ("Filesystem %s has no vfsops", vfc->vfc_name));
458 /*
459 * Check the mount and unmount operations.
460 */
461 vfsops = vfc->vfc_vfsops;
462 KASSERT(vfsops->vfs_mount != NULL,
463 ("Filesystem %s has no mount op", vfc->vfc_name));
464 KASSERT(vfsops->vfs_unmount != NULL,
465 ("Filesystem %s has no unmount op", vfc->vfc_name));
466
467 if (vfsops->vfs_root == NULL)
468 /* return file system's root vnode */
469 vfsops->vfs_root = vfs_stdroot;
470 if (vfsops->vfs_quotactl == NULL)
471 /* quota control */
472 vfsops->vfs_quotactl = vfs_stdquotactl;
473 if (vfsops->vfs_statfs == NULL)
474 /* return file system's status */
475 vfsops->vfs_statfs = vfs_stdstatfs;
476 if (vfsops->vfs_sync == NULL)
477 /*
478 * flush unwritten data (nosync)
479 * file systems can use vfs_stdsync
480 * explicitly by setting it in the
481 * vfsop vector.
482 */
483 vfsops->vfs_sync = vfs_stdnosync;
484 if (vfsops->vfs_vget == NULL)
485 /* convert an inode number to a vnode */
486 vfsops->vfs_vget = vfs_stdvget;
487 if (vfsops->vfs_fhtovp == NULL)
488 /* turn an NFS file handle into a vnode */
489 vfsops->vfs_fhtovp = vfs_stdfhtovp;
490 if (vfsops->vfs_checkexp == NULL)
491 /* check if file system is exported */
492 vfsops->vfs_checkexp = vfs_stdcheckexp;
493 if (vfsops->vfs_init == NULL)
494 /* file system specific initialisation */
495 vfsops->vfs_init = vfs_stdinit;
496 if (vfsops->vfs_uninit == NULL)
497 /* file system specific uninitialisation */
498 vfsops->vfs_uninit = vfs_stduninit;
499 if (vfsops->vfs_extattrctl == NULL)
500 /* extended attribute control */
501 vfsops->vfs_extattrctl = vfs_stdextattrctl;
502 if (vfsops->vfs_sysctl == NULL)
503 vfsops->vfs_sysctl = vfs_stdsysctl;
504 if (vfsops->vfs_report_lockf == NULL)
505 vfsops->vfs_report_lockf = vfs_report_lockf;
506
507 if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
508 vfc->vfc_vfsops_sd = vfc->vfc_vfsops;
509 vfc->vfc_vfsops = &vfsops_sigdefer;
510 }
511
512 if (vfc->vfc_flags & VFCF_JAIL)
513 prison_add_vfs(vfc);
514
515 /*
516 * Call init function for this VFS...
517 */
518 if ((vfc->vfc_flags & VFCF_SBDRY) != 0)
519 vfc->vfc_vfsops_sd->vfs_init(vfc);
520 else
521 vfc->vfc_vfsops->vfs_init(vfc);
522 vfsconf_unlock();
523
524 /*
525 * If this filesystem has a sysctl node under vfs
526 * (i.e. vfs.xxfs), then change the oid number of that node to
527 * match the filesystem's type number. This allows user code
528 * which uses the type number to read sysctl variables defined
529 * by the filesystem to continue working. Since the oids are
530 * in a sorted list, we need to make sure the order is
531 * preserved by re-registering the oid after modifying its
532 * number.
533 */
534 sysctl_wlock();
535 RB_FOREACH(oidp, sysctl_oid_list, SYSCTL_CHILDREN(&sysctl___vfs)) {
536 if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
537 sysctl_unregister_oid(oidp);
538 oidp->oid_number = vfc->vfc_typenum;
539 sysctl_register_oid(oidp);
540 break;
541 }
542 }
543 sysctl_wunlock();
544
545 return (0);
546 }
547
548 /* Remove registration of a filesystem type */
549 static int
vfs_unregister(struct vfsconf * vfc)550 vfs_unregister(struct vfsconf *vfc)
551 {
552 struct vfsconf *vfsp;
553 int error, maxtypenum;
554
555 vfsconf_lock();
556 vfsp = vfs_byname_locked(vfc->vfc_name);
557 if (vfsp == NULL) {
558 vfsconf_unlock();
559 return (EINVAL);
560 }
561 if (vfsp->vfc_refcount != 0) {
562 vfsconf_unlock();
563 return (EBUSY);
564 }
565 error = 0;
566 if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
567 if (vfc->vfc_vfsops_sd->vfs_uninit != NULL)
568 error = vfc->vfc_vfsops_sd->vfs_uninit(vfsp);
569 } else {
570 if (vfc->vfc_vfsops->vfs_uninit != NULL)
571 error = vfc->vfc_vfsops->vfs_uninit(vfsp);
572 }
573 if (error != 0) {
574 vfsconf_unlock();
575 return (error);
576 }
577 TAILQ_REMOVE(&vfsconf, vfsp, vfc_list);
578 maxtypenum = VFS_GENERIC;
579 TAILQ_FOREACH(vfsp, &vfsconf, vfc_list)
580 if (maxtypenum < vfsp->vfc_typenum)
581 maxtypenum = vfsp->vfc_typenum;
582 maxvfsconf = maxtypenum + 1;
583 vfsconf_unlock();
584 return (0);
585 }
586
587 /*
588 * Standard kernel module handling code for filesystem modules.
589 * Referenced from VFS_SET().
590 */
591 int
vfs_modevent(module_t mod,int type,void * data)592 vfs_modevent(module_t mod, int type, void *data)
593 {
594 struct vfsconf *vfc;
595 int error = 0;
596
597 vfc = (struct vfsconf *)data;
598
599 switch (type) {
600 case MOD_LOAD:
601 if (vfc)
602 error = vfs_register(vfc);
603 break;
604
605 case MOD_UNLOAD:
606 if (vfc)
607 error = vfs_unregister(vfc);
608 break;
609 default:
610 error = EOPNOTSUPP;
611 break;
612 }
613 return (error);
614 }
615