FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_mount.c
1 /*-
2 * Copyright (c) 1999-2004 Poul-Henning Kamp
3 * Copyright (c) 1999 Michael Smith
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/9.1/sys/kern/vfs_mount.c 235626 2012-05-18 19:48:38Z mckusick $");
39
40 #include <sys/param.h>
41 #include <sys/conf.h>
42 #include <sys/fcntl.h>
43 #include <sys/jail.h>
44 #include <sys/kernel.h>
45 #include <sys/libkern.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/mutex.h>
49 #include <sys/namei.h>
50 #include <sys/priv.h>
51 #include <sys/proc.h>
52 #include <sys/filedesc.h>
53 #include <sys/reboot.h>
54 #include <sys/sbuf.h>
55 #include <sys/syscallsubr.h>
56 #include <sys/sysproto.h>
57 #include <sys/sx.h>
58 #include <sys/sysctl.h>
59 #include <sys/sysent.h>
60 #include <sys/systm.h>
61 #include <sys/vnode.h>
62 #include <vm/uma.h>
63
64 #include <geom/geom.h>
65
66 #include <machine/stdarg.h>
67
68 #include <security/audit/audit.h>
69 #include <security/mac/mac_framework.h>
70
71 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
72
73 static int vfs_domount(struct thread *td, const char *fstype, char *fspath,
74 uint64_t fsflags, struct vfsoptlist **optlist);
75 static void free_mntarg(struct mntarg *ma);
76
77 static int usermount = 0;
78 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0,
79 "Unprivileged users may mount and unmount file systems");
80
81 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
82 static uma_zone_t mount_zone;
83
84 /* List of mounted filesystems. */
85 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
86
87 /* For any iteration/modification of mountlist */
88 struct mtx mountlist_mtx;
89 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
90
91 /*
92 * Global opts, taken by all filesystems
93 */
94 static const char *global_opts[] = {
95 "errmsg",
96 "fstype",
97 "fspath",
98 "ro",
99 "rw",
100 "nosuid",
101 "noexec",
102 NULL
103 };
104
105 static int
106 mount_init(void *mem, int size, int flags)
107 {
108 struct mount *mp;
109
110 mp = (struct mount *)mem;
111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
112 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
113 return (0);
114 }
115
116 static void
117 mount_fini(void *mem, int size)
118 {
119 struct mount *mp;
120
121 mp = (struct mount *)mem;
122 lockdestroy(&mp->mnt_explock);
123 mtx_destroy(&mp->mnt_mtx);
124 }
125
126 static void
127 vfs_mount_init(void *dummy __unused)
128 {
129
130 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
131 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
132 }
133 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
134
135 /*
136 * ---------------------------------------------------------------------
137 * Functions for building and sanitizing the mount options
138 */
139
140 /* Remove one mount option. */
141 static void
142 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
143 {
144
145 TAILQ_REMOVE(opts, opt, link);
146 free(opt->name, M_MOUNT);
147 if (opt->value != NULL)
148 free(opt->value, M_MOUNT);
149 free(opt, M_MOUNT);
150 }
151
152 /* Release all resources related to the mount options. */
153 void
154 vfs_freeopts(struct vfsoptlist *opts)
155 {
156 struct vfsopt *opt;
157
158 while (!TAILQ_EMPTY(opts)) {
159 opt = TAILQ_FIRST(opts);
160 vfs_freeopt(opts, opt);
161 }
162 free(opts, M_MOUNT);
163 }
164
165 void
166 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
167 {
168 struct vfsopt *opt, *temp;
169
170 if (opts == NULL)
171 return;
172 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
173 if (strcmp(opt->name, name) == 0)
174 vfs_freeopt(opts, opt);
175 }
176 }
177
178 static int
179 vfs_isopt_ro(const char *opt)
180 {
181
182 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
183 strcmp(opt, "norw") == 0)
184 return (1);
185 return (0);
186 }
187
188 static int
189 vfs_isopt_rw(const char *opt)
190 {
191
192 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
193 return (1);
194 return (0);
195 }
196
197 /*
198 * Check if options are equal (with or without the "no" prefix).
199 */
200 static int
201 vfs_equalopts(const char *opt1, const char *opt2)
202 {
203 char *p;
204
205 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
206 if (strcmp(opt1, opt2) == 0)
207 return (1);
208 /* "noopt" vs. "opt" */
209 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
210 return (1);
211 /* "opt" vs. "noopt" */
212 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
213 return (1);
214 while ((p = strchr(opt1, '.')) != NULL &&
215 !strncmp(opt1, opt2, ++p - opt1)) {
216 opt2 += p - opt1;
217 opt1 = p;
218 /* "foo.noopt" vs. "foo.opt" */
219 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
220 return (1);
221 /* "foo.opt" vs. "foo.noopt" */
222 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
223 return (1);
224 }
225 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */
226 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
227 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
228 return (1);
229 return (0);
230 }
231
232 /*
233 * If a mount option is specified several times,
234 * (with or without the "no" prefix) only keep
235 * the last occurence of it.
236 */
237 static void
238 vfs_sanitizeopts(struct vfsoptlist *opts)
239 {
240 struct vfsopt *opt, *opt2, *tmp;
241
242 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
243 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
244 while (opt2 != NULL) {
245 if (vfs_equalopts(opt->name, opt2->name)) {
246 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
247 vfs_freeopt(opts, opt2);
248 opt2 = tmp;
249 } else {
250 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
251 }
252 }
253 }
254 }
255
256 /*
257 * Build a linked list of mount options from a struct uio.
258 */
259 int
260 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
261 {
262 struct vfsoptlist *opts;
263 struct vfsopt *opt;
264 size_t memused, namelen, optlen;
265 unsigned int i, iovcnt;
266 int error;
267
268 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
269 TAILQ_INIT(opts);
270 memused = 0;
271 iovcnt = auio->uio_iovcnt;
272 for (i = 0; i < iovcnt; i += 2) {
273 namelen = auio->uio_iov[i].iov_len;
274 optlen = auio->uio_iov[i + 1].iov_len;
275 memused += sizeof(struct vfsopt) + optlen + namelen;
276 /*
277 * Avoid consuming too much memory, and attempts to overflow
278 * memused.
279 */
280 if (memused > VFS_MOUNTARG_SIZE_MAX ||
281 optlen > VFS_MOUNTARG_SIZE_MAX ||
282 namelen > VFS_MOUNTARG_SIZE_MAX) {
283 error = EINVAL;
284 goto bad;
285 }
286
287 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
288 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
289 opt->value = NULL;
290 opt->len = 0;
291 opt->pos = i / 2;
292 opt->seen = 0;
293
294 /*
295 * Do this early, so jumps to "bad" will free the current
296 * option.
297 */
298 TAILQ_INSERT_TAIL(opts, opt, link);
299
300 if (auio->uio_segflg == UIO_SYSSPACE) {
301 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
302 } else {
303 error = copyin(auio->uio_iov[i].iov_base, opt->name,
304 namelen);
305 if (error)
306 goto bad;
307 }
308 /* Ensure names are null-terminated strings. */
309 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
310 error = EINVAL;
311 goto bad;
312 }
313 if (optlen != 0) {
314 opt->len = optlen;
315 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
316 if (auio->uio_segflg == UIO_SYSSPACE) {
317 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
318 optlen);
319 } else {
320 error = copyin(auio->uio_iov[i + 1].iov_base,
321 opt->value, optlen);
322 if (error)
323 goto bad;
324 }
325 }
326 }
327 vfs_sanitizeopts(opts);
328 *options = opts;
329 return (0);
330 bad:
331 vfs_freeopts(opts);
332 return (error);
333 }
334
335 /*
336 * Merge the old mount options with the new ones passed
337 * in the MNT_UPDATE case.
338 *
339 * XXX: This function will keep a "nofoo" option in the new
340 * options. E.g, if the option's canonical name is "foo",
341 * "nofoo" ends up in the mount point's active options.
342 */
343 static void
344 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
345 {
346 struct vfsopt *opt, *new;
347
348 TAILQ_FOREACH(opt, oldopts, link) {
349 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
350 new->name = strdup(opt->name, M_MOUNT);
351 if (opt->len != 0) {
352 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
353 bcopy(opt->value, new->value, opt->len);
354 } else
355 new->value = NULL;
356 new->len = opt->len;
357 new->seen = opt->seen;
358 TAILQ_INSERT_HEAD(toopts, new, link);
359 }
360 vfs_sanitizeopts(toopts);
361 }
362
363 /*
364 * Mount a filesystem.
365 */
366 int
367 sys_nmount(td, uap)
368 struct thread *td;
369 struct nmount_args /* {
370 struct iovec *iovp;
371 unsigned int iovcnt;
372 int flags;
373 } */ *uap;
374 {
375 struct uio *auio;
376 int error;
377 u_int iovcnt;
378 uint64_t flags;
379
380 /*
381 * Mount flags are now 64-bits. On 32-bit archtectures only
382 * 32-bits are passed in, but from here on everything handles
383 * 64-bit flags correctly.
384 */
385 flags = uap->flags;
386
387 AUDIT_ARG_FFLAGS(flags);
388 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
389 uap->iovp, uap->iovcnt, flags);
390
391 /*
392 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
393 * userspace to set this flag, but we must filter it out if we want
394 * MNT_UPDATE on the root file system to work.
395 * MNT_ROOTFS should only be set by the kernel when mounting its
396 * root file system.
397 */
398 flags &= ~MNT_ROOTFS;
399
400 iovcnt = uap->iovcnt;
401 /*
402 * Check that we have an even number of iovec's
403 * and that we have at least two options.
404 */
405 if ((iovcnt & 1) || (iovcnt < 4)) {
406 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
407 uap->iovcnt);
408 return (EINVAL);
409 }
410
411 error = copyinuio(uap->iovp, iovcnt, &auio);
412 if (error) {
413 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
414 __func__, error);
415 return (error);
416 }
417 error = vfs_donmount(td, flags, auio);
418
419 free(auio, M_IOV);
420 return (error);
421 }
422
423 /*
424 * ---------------------------------------------------------------------
425 * Various utility functions
426 */
427
428 void
429 vfs_ref(struct mount *mp)
430 {
431
432 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
433 MNT_ILOCK(mp);
434 MNT_REF(mp);
435 MNT_IUNLOCK(mp);
436 }
437
438 void
439 vfs_rel(struct mount *mp)
440 {
441
442 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
443 MNT_ILOCK(mp);
444 MNT_REL(mp);
445 MNT_IUNLOCK(mp);
446 }
447
448 /*
449 * Allocate and initialize the mount point struct.
450 */
451 struct mount *
452 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
453 struct ucred *cred)
454 {
455 struct mount *mp;
456
457 mp = uma_zalloc(mount_zone, M_WAITOK);
458 bzero(&mp->mnt_startzero,
459 __rangeof(struct mount, mnt_startzero, mnt_endzero));
460 TAILQ_INIT(&mp->mnt_nvnodelist);
461 mp->mnt_nvnodelistsize = 0;
462 TAILQ_INIT(&mp->mnt_activevnodelist);
463 mp->mnt_activevnodelistsize = 0;
464 mp->mnt_ref = 0;
465 (void) vfs_busy(mp, MBF_NOWAIT);
466 mp->mnt_op = vfsp->vfc_vfsops;
467 mp->mnt_vfc = vfsp;
468 vfsp->vfc_refcount++; /* XXX Unlocked */
469 mp->mnt_stat.f_type = vfsp->vfc_typenum;
470 mp->mnt_gen++;
471 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
472 mp->mnt_vnodecovered = vp;
473 mp->mnt_cred = crdup(cred);
474 mp->mnt_stat.f_owner = cred->cr_uid;
475 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
476 mp->mnt_iosize_max = DFLTPHYS;
477 #ifdef MAC
478 mac_mount_init(mp);
479 mac_mount_create(cred, mp);
480 #endif
481 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
482 return (mp);
483 }
484
485 /*
486 * Destroy the mount struct previously allocated by vfs_mount_alloc().
487 */
488 void
489 vfs_mount_destroy(struct mount *mp)
490 {
491
492 MNT_ILOCK(mp);
493 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
494 if (mp->mnt_kern_flag & MNTK_MWAIT) {
495 mp->mnt_kern_flag &= ~MNTK_MWAIT;
496 wakeup(mp);
497 }
498 while (mp->mnt_ref)
499 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
500 KASSERT(mp->mnt_ref == 0,
501 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
502 __FILE__, __LINE__));
503 if (mp->mnt_writeopcount != 0)
504 panic("vfs_mount_destroy: nonzero writeopcount");
505 if (mp->mnt_secondary_writes != 0)
506 panic("vfs_mount_destroy: nonzero secondary_writes");
507 mp->mnt_vfc->vfc_refcount--;
508 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
509 struct vnode *vp;
510
511 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
512 vprint("", vp);
513 panic("unmount: dangling vnode");
514 }
515 if (mp->mnt_nvnodelistsize != 0)
516 panic("vfs_mount_destroy: nonzero nvnodelistsize");
517 if (mp->mnt_activevnodelistsize != 0)
518 panic("vfs_mount_destroy: nonzero activevnodelistsize");
519 if (mp->mnt_lockref != 0)
520 panic("vfs_mount_destroy: nonzero lock refcount");
521 MNT_IUNLOCK(mp);
522 #ifdef MAC
523 mac_mount_destroy(mp);
524 #endif
525 if (mp->mnt_opt != NULL)
526 vfs_freeopts(mp->mnt_opt);
527 crfree(mp->mnt_cred);
528 uma_zfree(mount_zone, mp);
529 }
530
531 int
532 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
533 {
534 struct vfsoptlist *optlist;
535 struct vfsopt *opt, *tmp_opt;
536 char *fstype, *fspath, *errmsg;
537 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
538
539 errmsg = fspath = NULL;
540 errmsg_len = fspathlen = 0;
541 errmsg_pos = -1;
542
543 error = vfs_buildopts(fsoptions, &optlist);
544 if (error)
545 return (error);
546
547 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
548 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
549
550 /*
551 * We need these two options before the others,
552 * and they are mandatory for any filesystem.
553 * Ensure they are NUL terminated as well.
554 */
555 fstypelen = 0;
556 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
557 if (error || fstype[fstypelen - 1] != '\0') {
558 error = EINVAL;
559 if (errmsg != NULL)
560 strncpy(errmsg, "Invalid fstype", errmsg_len);
561 goto bail;
562 }
563 fspathlen = 0;
564 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
565 if (error || fspath[fspathlen - 1] != '\0') {
566 error = EINVAL;
567 if (errmsg != NULL)
568 strncpy(errmsg, "Invalid fspath", errmsg_len);
569 goto bail;
570 }
571
572 /*
573 * We need to see if we have the "update" option
574 * before we call vfs_domount(), since vfs_domount() has special
575 * logic based on MNT_UPDATE. This is very important
576 * when we want to update the root filesystem.
577 */
578 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
579 if (strcmp(opt->name, "update") == 0) {
580 fsflags |= MNT_UPDATE;
581 vfs_freeopt(optlist, opt);
582 }
583 else if (strcmp(opt->name, "async") == 0)
584 fsflags |= MNT_ASYNC;
585 else if (strcmp(opt->name, "force") == 0) {
586 fsflags |= MNT_FORCE;
587 vfs_freeopt(optlist, opt);
588 }
589 else if (strcmp(opt->name, "reload") == 0) {
590 fsflags |= MNT_RELOAD;
591 vfs_freeopt(optlist, opt);
592 }
593 else if (strcmp(opt->name, "multilabel") == 0)
594 fsflags |= MNT_MULTILABEL;
595 else if (strcmp(opt->name, "noasync") == 0)
596 fsflags &= ~MNT_ASYNC;
597 else if (strcmp(opt->name, "noatime") == 0)
598 fsflags |= MNT_NOATIME;
599 else if (strcmp(opt->name, "atime") == 0) {
600 free(opt->name, M_MOUNT);
601 opt->name = strdup("nonoatime", M_MOUNT);
602 }
603 else if (strcmp(opt->name, "noclusterr") == 0)
604 fsflags |= MNT_NOCLUSTERR;
605 else if (strcmp(opt->name, "clusterr") == 0) {
606 free(opt->name, M_MOUNT);
607 opt->name = strdup("nonoclusterr", M_MOUNT);
608 }
609 else if (strcmp(opt->name, "noclusterw") == 0)
610 fsflags |= MNT_NOCLUSTERW;
611 else if (strcmp(opt->name, "clusterw") == 0) {
612 free(opt->name, M_MOUNT);
613 opt->name = strdup("nonoclusterw", M_MOUNT);
614 }
615 else if (strcmp(opt->name, "noexec") == 0)
616 fsflags |= MNT_NOEXEC;
617 else if (strcmp(opt->name, "exec") == 0) {
618 free(opt->name, M_MOUNT);
619 opt->name = strdup("nonoexec", M_MOUNT);
620 }
621 else if (strcmp(opt->name, "nosuid") == 0)
622 fsflags |= MNT_NOSUID;
623 else if (strcmp(opt->name, "suid") == 0) {
624 free(opt->name, M_MOUNT);
625 opt->name = strdup("nonosuid", M_MOUNT);
626 }
627 else if (strcmp(opt->name, "nosymfollow") == 0)
628 fsflags |= MNT_NOSYMFOLLOW;
629 else if (strcmp(opt->name, "symfollow") == 0) {
630 free(opt->name, M_MOUNT);
631 opt->name = strdup("nonosymfollow", M_MOUNT);
632 }
633 else if (strcmp(opt->name, "noro") == 0)
634 fsflags &= ~MNT_RDONLY;
635 else if (strcmp(opt->name, "rw") == 0)
636 fsflags &= ~MNT_RDONLY;
637 else if (strcmp(opt->name, "ro") == 0)
638 fsflags |= MNT_RDONLY;
639 else if (strcmp(opt->name, "rdonly") == 0) {
640 free(opt->name, M_MOUNT);
641 opt->name = strdup("ro", M_MOUNT);
642 fsflags |= MNT_RDONLY;
643 }
644 else if (strcmp(opt->name, "suiddir") == 0)
645 fsflags |= MNT_SUIDDIR;
646 else if (strcmp(opt->name, "sync") == 0)
647 fsflags |= MNT_SYNCHRONOUS;
648 else if (strcmp(opt->name, "union") == 0)
649 fsflags |= MNT_UNION;
650 }
651
652 /*
653 * Be ultra-paranoid about making sure the type and fspath
654 * variables will fit in our mp buffers, including the
655 * terminating NUL.
656 */
657 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
658 error = ENAMETOOLONG;
659 goto bail;
660 }
661
662 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
663 bail:
664 /* copyout the errmsg */
665 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
666 && errmsg_len > 0 && errmsg != NULL) {
667 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
668 bcopy(errmsg,
669 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
670 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
671 } else {
672 copyout(errmsg,
673 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
674 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
675 }
676 }
677
678 if (optlist != NULL)
679 vfs_freeopts(optlist);
680 return (error);
681 }
682
683 /*
684 * Old mount API.
685 */
686 #ifndef _SYS_SYSPROTO_H_
687 struct mount_args {
688 char *type;
689 char *path;
690 int flags;
691 caddr_t data;
692 };
693 #endif
694 /* ARGSUSED */
695 int
696 sys_mount(td, uap)
697 struct thread *td;
698 struct mount_args /* {
699 char *type;
700 char *path;
701 int flags;
702 caddr_t data;
703 } */ *uap;
704 {
705 char *fstype;
706 struct vfsconf *vfsp = NULL;
707 struct mntarg *ma = NULL;
708 uint64_t flags;
709 int error;
710
711 /*
712 * Mount flags are now 64-bits. On 32-bit archtectures only
713 * 32-bits are passed in, but from here on everything handles
714 * 64-bit flags correctly.
715 */
716 flags = uap->flags;
717
718 AUDIT_ARG_FFLAGS(flags);
719
720 /*
721 * Filter out MNT_ROOTFS. We do not want clients of mount() in
722 * userspace to set this flag, but we must filter it out if we want
723 * MNT_UPDATE on the root file system to work.
724 * MNT_ROOTFS should only be set by the kernel when mounting its
725 * root file system.
726 */
727 flags &= ~MNT_ROOTFS;
728
729 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
730 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
731 if (error) {
732 free(fstype, M_TEMP);
733 return (error);
734 }
735
736 AUDIT_ARG_TEXT(fstype);
737 mtx_lock(&Giant);
738 vfsp = vfs_byname_kld(fstype, td, &error);
739 free(fstype, M_TEMP);
740 if (vfsp == NULL) {
741 mtx_unlock(&Giant);
742 return (ENOENT);
743 }
744 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
745 mtx_unlock(&Giant);
746 return (EOPNOTSUPP);
747 }
748
749 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN);
750 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
751 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
752 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
753 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
754
755 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
756 mtx_unlock(&Giant);
757 return (error);
758 }
759
760 /*
761 * vfs_domount_first(): first file system mount (not update)
762 */
763 static int
764 vfs_domount_first(
765 struct thread *td, /* Calling thread. */
766 struct vfsconf *vfsp, /* File system type. */
767 char *fspath, /* Mount path. */
768 struct vnode *vp, /* Vnode to be covered. */
769 uint64_t fsflags, /* Flags common to all filesystems. */
770 struct vfsoptlist **optlist /* Options local to the filesystem. */
771 )
772 {
773 struct vattr va;
774 struct mount *mp;
775 struct vnode *newdp;
776 int error;
777
778 mtx_assert(&Giant, MA_OWNED);
779 ASSERT_VOP_ELOCKED(vp, __func__);
780 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
781
782 /*
783 * If the user is not root, ensure that they own the directory
784 * onto which we are attempting to mount.
785 */
786 error = VOP_GETATTR(vp, &va, td->td_ucred);
787 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
788 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
789 if (error == 0)
790 error = vinvalbuf(vp, V_SAVE, 0, 0);
791 if (error == 0 && vp->v_type != VDIR)
792 error = ENOTDIR;
793 if (error == 0) {
794 VI_LOCK(vp);
795 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
796 vp->v_iflag |= VI_MOUNT;
797 else
798 error = EBUSY;
799 VI_UNLOCK(vp);
800 }
801 if (error != 0) {
802 vput(vp);
803 return (error);
804 }
805 VOP_UNLOCK(vp, 0);
806
807 /* Allocate and initialize the filesystem. */
808 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
809 /* XXXMAC: pass to vfs_mount_alloc? */
810 mp->mnt_optnew = *optlist;
811 /* Set the mount level flags. */
812 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
813
814 /*
815 * Mount the filesystem.
816 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
817 * get. No freeing of cn_pnbuf.
818 */
819 error = VFS_MOUNT(mp);
820 if (error != 0) {
821 vfs_unbusy(mp);
822 vfs_mount_destroy(mp);
823 VI_LOCK(vp);
824 vp->v_iflag &= ~VI_MOUNT;
825 VI_UNLOCK(vp);
826 vrele(vp);
827 return (error);
828 }
829
830 if (mp->mnt_opt != NULL)
831 vfs_freeopts(mp->mnt_opt);
832 mp->mnt_opt = mp->mnt_optnew;
833 *optlist = NULL;
834 (void)VFS_STATFS(mp, &mp->mnt_stat);
835
836 /*
837 * Prevent external consumers of mount options from reading mnt_optnew.
838 */
839 mp->mnt_optnew = NULL;
840
841 MNT_ILOCK(mp);
842 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
843 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
844 mp->mnt_kern_flag |= MNTK_ASYNC;
845 else
846 mp->mnt_kern_flag &= ~MNTK_ASYNC;
847 MNT_IUNLOCK(mp);
848
849 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
850 cache_purge(vp);
851 VI_LOCK(vp);
852 vp->v_iflag &= ~VI_MOUNT;
853 VI_UNLOCK(vp);
854 vp->v_mountedhere = mp;
855 /* Place the new filesystem at the end of the mount list. */
856 mtx_lock(&mountlist_mtx);
857 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
858 mtx_unlock(&mountlist_mtx);
859 vfs_event_signal(NULL, VQ_MOUNT, 0);
860 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
861 panic("mount: lost mount");
862 VOP_UNLOCK(newdp, 0);
863 VOP_UNLOCK(vp, 0);
864 mountcheckdirs(vp, newdp);
865 vrele(newdp);
866 if ((mp->mnt_flag & MNT_RDONLY) == 0)
867 vfs_allocate_syncvnode(mp);
868 vfs_unbusy(mp);
869 return (0);
870 }
871
872 /*
873 * vfs_domount_update(): update of mounted file system
874 */
875 static int
876 vfs_domount_update(
877 struct thread *td, /* Calling thread. */
878 struct vnode *vp, /* Mount point vnode. */
879 uint64_t fsflags, /* Flags common to all filesystems. */
880 struct vfsoptlist **optlist /* Options local to the filesystem. */
881 )
882 {
883 struct oexport_args oexport;
884 struct export_args export;
885 struct mount *mp;
886 int error, export_error;
887 uint64_t flag;
888
889 mtx_assert(&Giant, MA_OWNED);
890 ASSERT_VOP_ELOCKED(vp, __func__);
891 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
892
893 if ((vp->v_vflag & VV_ROOT) == 0) {
894 vput(vp);
895 return (EINVAL);
896 }
897 mp = vp->v_mount;
898 /*
899 * We only allow the filesystem to be reloaded if it
900 * is currently mounted read-only.
901 */
902 flag = mp->mnt_flag;
903 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
904 vput(vp);
905 return (EOPNOTSUPP); /* Needs translation */
906 }
907 /*
908 * Only privileged root, or (if MNT_USER is set) the user that
909 * did the original mount is permitted to update it.
910 */
911 error = vfs_suser(mp, td);
912 if (error != 0) {
913 vput(vp);
914 return (error);
915 }
916 if (vfs_busy(mp, MBF_NOWAIT)) {
917 vput(vp);
918 return (EBUSY);
919 }
920 VI_LOCK(vp);
921 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
922 VI_UNLOCK(vp);
923 vfs_unbusy(mp);
924 vput(vp);
925 return (EBUSY);
926 }
927 vp->v_iflag |= VI_MOUNT;
928 VI_UNLOCK(vp);
929 VOP_UNLOCK(vp, 0);
930
931 MNT_ILOCK(mp);
932 mp->mnt_flag &= ~MNT_UPDATEMASK;
933 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
934 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
935 if ((mp->mnt_flag & MNT_ASYNC) == 0)
936 mp->mnt_kern_flag &= ~MNTK_ASYNC;
937 MNT_IUNLOCK(mp);
938 mp->mnt_optnew = *optlist;
939 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
940
941 /*
942 * Mount the filesystem.
943 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
944 * get. No freeing of cn_pnbuf.
945 */
946 error = VFS_MOUNT(mp);
947
948 export_error = 0;
949 if (error == 0) {
950 /* Process the export option. */
951 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
952 sizeof(export)) == 0) {
953 export_error = vfs_export(mp, &export);
954 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
955 sizeof(oexport)) == 0) {
956 export.ex_flags = oexport.ex_flags;
957 export.ex_root = oexport.ex_root;
958 export.ex_anon = oexport.ex_anon;
959 export.ex_addr = oexport.ex_addr;
960 export.ex_addrlen = oexport.ex_addrlen;
961 export.ex_mask = oexport.ex_mask;
962 export.ex_masklen = oexport.ex_masklen;
963 export.ex_indexfile = oexport.ex_indexfile;
964 export.ex_numsecflavors = 0;
965 export_error = vfs_export(mp, &export);
966 }
967 }
968
969 MNT_ILOCK(mp);
970 if (error == 0) {
971 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
972 MNT_SNAPSHOT);
973 } else {
974 /*
975 * If we fail, restore old mount flags. MNT_QUOTA is special,
976 * because it is not part of MNT_UPDATEMASK, but it could have
977 * changed in the meantime if quotactl(2) was called.
978 * All in all we want current value of MNT_QUOTA, not the old
979 * one.
980 */
981 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
982 }
983 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
984 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
985 mp->mnt_kern_flag |= MNTK_ASYNC;
986 else
987 mp->mnt_kern_flag &= ~MNTK_ASYNC;
988 MNT_IUNLOCK(mp);
989
990 if (error != 0)
991 goto end;
992
993 if (mp->mnt_opt != NULL)
994 vfs_freeopts(mp->mnt_opt);
995 mp->mnt_opt = mp->mnt_optnew;
996 *optlist = NULL;
997 (void)VFS_STATFS(mp, &mp->mnt_stat);
998 /*
999 * Prevent external consumers of mount options from reading
1000 * mnt_optnew.
1001 */
1002 mp->mnt_optnew = NULL;
1003
1004 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1005 vfs_allocate_syncvnode(mp);
1006 else
1007 vfs_deallocate_syncvnode(mp);
1008 end:
1009 vfs_unbusy(mp);
1010 VI_LOCK(vp);
1011 vp->v_iflag &= ~VI_MOUNT;
1012 VI_UNLOCK(vp);
1013 vrele(vp);
1014 return (error != 0 ? error : export_error);
1015 }
1016
1017 /*
1018 * vfs_domount(): actually attempt a filesystem mount.
1019 */
1020 static int
1021 vfs_domount(
1022 struct thread *td, /* Calling thread. */
1023 const char *fstype, /* Filesystem type. */
1024 char *fspath, /* Mount path. */
1025 uint64_t fsflags, /* Flags common to all filesystems. */
1026 struct vfsoptlist **optlist /* Options local to the filesystem. */
1027 )
1028 {
1029 struct vfsconf *vfsp;
1030 struct nameidata nd;
1031 struct vnode *vp;
1032 char *pathbuf;
1033 int error;
1034
1035 /*
1036 * Be ultra-paranoid about making sure the type and fspath
1037 * variables will fit in our mp buffers, including the
1038 * terminating NUL.
1039 */
1040 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1041 return (ENAMETOOLONG);
1042
1043 if (jailed(td->td_ucred) || usermount == 0) {
1044 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1045 return (error);
1046 }
1047
1048 /*
1049 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1050 */
1051 if (fsflags & MNT_EXPORTED) {
1052 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1053 if (error)
1054 return (error);
1055 }
1056 if (fsflags & MNT_SUIDDIR) {
1057 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1058 if (error)
1059 return (error);
1060 }
1061 /*
1062 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1063 */
1064 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1065 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1066 fsflags |= MNT_NOSUID | MNT_USER;
1067 }
1068
1069 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1070 vfsp = NULL;
1071 if ((fsflags & MNT_UPDATE) == 0) {
1072 /* Don't try to load KLDs if we're mounting the root. */
1073 if (fsflags & MNT_ROOTFS)
1074 vfsp = vfs_byname(fstype);
1075 else
1076 vfsp = vfs_byname_kld(fstype, td, &error);
1077 if (vfsp == NULL)
1078 return (ENODEV);
1079 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1080 return (EPERM);
1081 }
1082
1083 /*
1084 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1085 */
1086 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1087 UIO_SYSSPACE, fspath, td);
1088 error = namei(&nd);
1089 if (error != 0)
1090 return (error);
1091 if (!NDHASGIANT(&nd))
1092 mtx_lock(&Giant);
1093 NDFREE(&nd, NDF_ONLY_PNBUF);
1094 vp = nd.ni_vp;
1095 if ((fsflags & MNT_UPDATE) == 0) {
1096 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1097 strcpy(pathbuf, fspath);
1098 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1099 /* debug.disablefullpath == 1 results in ENODEV */
1100 if (error == 0 || error == ENODEV) {
1101 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1102 fsflags, optlist);
1103 }
1104 free(pathbuf, M_TEMP);
1105 } else
1106 error = vfs_domount_update(td, vp, fsflags, optlist);
1107 mtx_unlock(&Giant);
1108
1109 ASSERT_VI_UNLOCKED(vp, __func__);
1110 ASSERT_VOP_UNLOCKED(vp, __func__);
1111
1112 return (error);
1113 }
1114
1115 /*
1116 * Unmount a filesystem.
1117 *
1118 * Note: unmount takes a path to the vnode mounted on as argument, not
1119 * special file (as before).
1120 */
1121 #ifndef _SYS_SYSPROTO_H_
1122 struct unmount_args {
1123 char *path;
1124 int flags;
1125 };
1126 #endif
1127 /* ARGSUSED */
1128 int
1129 sys_unmount(td, uap)
1130 struct thread *td;
1131 register struct unmount_args /* {
1132 char *path;
1133 int flags;
1134 } */ *uap;
1135 {
1136 struct nameidata nd;
1137 struct mount *mp;
1138 char *pathbuf;
1139 int error, id0, id1, vfslocked;
1140
1141 AUDIT_ARG_VALUE(uap->flags);
1142 if (jailed(td->td_ucred) || usermount == 0) {
1143 error = priv_check(td, PRIV_VFS_UNMOUNT);
1144 if (error)
1145 return (error);
1146 }
1147
1148 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1149 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1150 if (error) {
1151 free(pathbuf, M_TEMP);
1152 return (error);
1153 }
1154 mtx_lock(&Giant);
1155 if (uap->flags & MNT_BYFSID) {
1156 AUDIT_ARG_TEXT(pathbuf);
1157 /* Decode the filesystem ID. */
1158 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1159 mtx_unlock(&Giant);
1160 free(pathbuf, M_TEMP);
1161 return (EINVAL);
1162 }
1163
1164 mtx_lock(&mountlist_mtx);
1165 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1166 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1167 mp->mnt_stat.f_fsid.val[1] == id1)
1168 break;
1169 }
1170 mtx_unlock(&mountlist_mtx);
1171 } else {
1172 AUDIT_ARG_UPATH1(td, pathbuf);
1173 /*
1174 * Try to find global path for path argument.
1175 */
1176 NDINIT(&nd, LOOKUP,
1177 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1178 UIO_SYSSPACE, pathbuf, td);
1179 if (namei(&nd) == 0) {
1180 vfslocked = NDHASGIANT(&nd);
1181 NDFREE(&nd, NDF_ONLY_PNBUF);
1182 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1183 MNAMELEN);
1184 if (error == 0 || error == ENODEV)
1185 vput(nd.ni_vp);
1186 VFS_UNLOCK_GIANT(vfslocked);
1187 }
1188 mtx_lock(&mountlist_mtx);
1189 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1190 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1191 break;
1192 }
1193 mtx_unlock(&mountlist_mtx);
1194 }
1195 free(pathbuf, M_TEMP);
1196 if (mp == NULL) {
1197 /*
1198 * Previously we returned ENOENT for a nonexistent path and
1199 * EINVAL for a non-mountpoint. We cannot tell these apart
1200 * now, so in the !MNT_BYFSID case return the more likely
1201 * EINVAL for compatibility.
1202 */
1203 mtx_unlock(&Giant);
1204 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1205 }
1206
1207 /*
1208 * Don't allow unmounting the root filesystem.
1209 */
1210 if (mp->mnt_flag & MNT_ROOTFS) {
1211 mtx_unlock(&Giant);
1212 return (EINVAL);
1213 }
1214 error = dounmount(mp, uap->flags, td);
1215 mtx_unlock(&Giant);
1216 return (error);
1217 }
1218
1219 /*
1220 * Do the actual filesystem unmount.
1221 */
1222 int
1223 dounmount(mp, flags, td)
1224 struct mount *mp;
1225 int flags;
1226 struct thread *td;
1227 {
1228 struct vnode *coveredvp, *fsrootvp;
1229 int error;
1230 uint64_t async_flag;
1231 int mnt_gen_r;
1232
1233 mtx_assert(&Giant, MA_OWNED);
1234
1235 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1236 mnt_gen_r = mp->mnt_gen;
1237 VI_LOCK(coveredvp);
1238 vholdl(coveredvp);
1239 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1240 vdrop(coveredvp);
1241 /*
1242 * Check for mp being unmounted while waiting for the
1243 * covered vnode lock.
1244 */
1245 if (coveredvp->v_mountedhere != mp ||
1246 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1247 VOP_UNLOCK(coveredvp, 0);
1248 return (EBUSY);
1249 }
1250 }
1251 /*
1252 * Only privileged root, or (if MNT_USER is set) the user that did the
1253 * original mount is permitted to unmount this filesystem.
1254 */
1255 error = vfs_suser(mp, td);
1256 if (error) {
1257 if (coveredvp)
1258 VOP_UNLOCK(coveredvp, 0);
1259 return (error);
1260 }
1261
1262 MNT_ILOCK(mp);
1263 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
1264 MNT_IUNLOCK(mp);
1265 if (coveredvp)
1266 VOP_UNLOCK(coveredvp, 0);
1267 return (EBUSY);
1268 }
1269 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1270 /* Allow filesystems to detect that a forced unmount is in progress. */
1271 if (flags & MNT_FORCE)
1272 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1273 error = 0;
1274 if (mp->mnt_lockref) {
1275 mp->mnt_kern_flag |= MNTK_DRAINING;
1276 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1277 "mount drain", 0);
1278 }
1279 MNT_IUNLOCK(mp);
1280 KASSERT(mp->mnt_lockref == 0,
1281 ("%s: invalid lock refcount in the drain path @ %s:%d",
1282 __func__, __FILE__, __LINE__));
1283 KASSERT(error == 0,
1284 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1285 __func__, __FILE__, __LINE__));
1286 vn_start_write(NULL, &mp, V_WAIT);
1287
1288 if (mp->mnt_flag & MNT_EXPUBLIC)
1289 vfs_setpublicfs(NULL, NULL, NULL);
1290
1291 vfs_msync(mp, MNT_WAIT);
1292 MNT_ILOCK(mp);
1293 async_flag = mp->mnt_flag & MNT_ASYNC;
1294 mp->mnt_flag &= ~MNT_ASYNC;
1295 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1296 MNT_IUNLOCK(mp);
1297 cache_purgevfs(mp); /* remove cache entries for this file sys */
1298 vfs_deallocate_syncvnode(mp);
1299 /*
1300 * For forced unmounts, move process cdir/rdir refs on the fs root
1301 * vnode to the covered vnode. For non-forced unmounts we want
1302 * such references to cause an EBUSY error.
1303 */
1304 if ((flags & MNT_FORCE) &&
1305 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1306 if (mp->mnt_vnodecovered != NULL)
1307 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1308 if (fsrootvp == rootvnode) {
1309 vrele(rootvnode);
1310 rootvnode = NULL;
1311 }
1312 vput(fsrootvp);
1313 }
1314 if (((mp->mnt_flag & MNT_RDONLY) ||
1315 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0)
1316 error = VFS_UNMOUNT(mp, flags);
1317 vn_finished_write(mp);
1318 /*
1319 * If we failed to flush the dirty blocks for this mount point,
1320 * undo all the cdir/rdir and rootvnode changes we made above.
1321 * Unless we failed to do so because the device is reporting that
1322 * it doesn't exist anymore.
1323 */
1324 if (error && error != ENXIO) {
1325 if ((flags & MNT_FORCE) &&
1326 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1327 if (mp->mnt_vnodecovered != NULL)
1328 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1329 if (rootvnode == NULL) {
1330 rootvnode = fsrootvp;
1331 vref(rootvnode);
1332 }
1333 vput(fsrootvp);
1334 }
1335 MNT_ILOCK(mp);
1336 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1337 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1338 MNT_IUNLOCK(mp);
1339 vfs_allocate_syncvnode(mp);
1340 MNT_ILOCK(mp);
1341 }
1342 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1343 mp->mnt_flag |= async_flag;
1344 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1345 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1346 mp->mnt_kern_flag |= MNTK_ASYNC;
1347 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1348 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1349 wakeup(mp);
1350 }
1351 MNT_IUNLOCK(mp);
1352 if (coveredvp)
1353 VOP_UNLOCK(coveredvp, 0);
1354 return (error);
1355 }
1356 mtx_lock(&mountlist_mtx);
1357 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1358 mtx_unlock(&mountlist_mtx);
1359 if (coveredvp != NULL) {
1360 coveredvp->v_mountedhere = NULL;
1361 vput(coveredvp);
1362 }
1363 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1364 vfs_mount_destroy(mp);
1365 return (0);
1366 }
1367
1368 /*
1369 * Report errors during filesystem mounting.
1370 */
1371 void
1372 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1373 {
1374 struct vfsoptlist *moptlist = mp->mnt_optnew;
1375 va_list ap;
1376 int error, len;
1377 char *errmsg;
1378
1379 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1380 if (error || errmsg == NULL || len <= 0)
1381 return;
1382
1383 va_start(ap, fmt);
1384 vsnprintf(errmsg, (size_t)len, fmt, ap);
1385 va_end(ap);
1386 }
1387
1388 void
1389 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1390 {
1391 va_list ap;
1392 int error, len;
1393 char *errmsg;
1394
1395 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1396 if (error || errmsg == NULL || len <= 0)
1397 return;
1398
1399 va_start(ap, fmt);
1400 vsnprintf(errmsg, (size_t)len, fmt, ap);
1401 va_end(ap);
1402 }
1403
1404 /*
1405 * ---------------------------------------------------------------------
1406 * Functions for querying mount options/arguments from filesystems.
1407 */
1408
1409 /*
1410 * Check that no unknown options are given
1411 */
1412 int
1413 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1414 {
1415 struct vfsopt *opt;
1416 char errmsg[255];
1417 const char **t, *p, *q;
1418 int ret = 0;
1419
1420 TAILQ_FOREACH(opt, opts, link) {
1421 p = opt->name;
1422 q = NULL;
1423 if (p[0] == 'n' && p[1] == 'o')
1424 q = p + 2;
1425 for(t = global_opts; *t != NULL; t++) {
1426 if (strcmp(*t, p) == 0)
1427 break;
1428 if (q != NULL) {
1429 if (strcmp(*t, q) == 0)
1430 break;
1431 }
1432 }
1433 if (*t != NULL)
1434 continue;
1435 for(t = legal; *t != NULL; t++) {
1436 if (strcmp(*t, p) == 0)
1437 break;
1438 if (q != NULL) {
1439 if (strcmp(*t, q) == 0)
1440 break;
1441 }
1442 }
1443 if (*t != NULL)
1444 continue;
1445 snprintf(errmsg, sizeof(errmsg),
1446 "mount option <%s> is unknown", p);
1447 ret = EINVAL;
1448 }
1449 if (ret != 0) {
1450 TAILQ_FOREACH(opt, opts, link) {
1451 if (strcmp(opt->name, "errmsg") == 0) {
1452 strncpy((char *)opt->value, errmsg, opt->len);
1453 break;
1454 }
1455 }
1456 if (opt == NULL)
1457 printf("%s\n", errmsg);
1458 }
1459 return (ret);
1460 }
1461
1462 /*
1463 * Get a mount option by its name.
1464 *
1465 * Return 0 if the option was found, ENOENT otherwise.
1466 * If len is non-NULL it will be filled with the length
1467 * of the option. If buf is non-NULL, it will be filled
1468 * with the address of the option.
1469 */
1470 int
1471 vfs_getopt(opts, name, buf, len)
1472 struct vfsoptlist *opts;
1473 const char *name;
1474 void **buf;
1475 int *len;
1476 {
1477 struct vfsopt *opt;
1478
1479 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1480
1481 TAILQ_FOREACH(opt, opts, link) {
1482 if (strcmp(name, opt->name) == 0) {
1483 opt->seen = 1;
1484 if (len != NULL)
1485 *len = opt->len;
1486 if (buf != NULL)
1487 *buf = opt->value;
1488 return (0);
1489 }
1490 }
1491 return (ENOENT);
1492 }
1493
1494 int
1495 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1496 {
1497 struct vfsopt *opt;
1498
1499 if (opts == NULL)
1500 return (-1);
1501
1502 TAILQ_FOREACH(opt, opts, link) {
1503 if (strcmp(name, opt->name) == 0) {
1504 opt->seen = 1;
1505 return (opt->pos);
1506 }
1507 }
1508 return (-1);
1509 }
1510
1511 char *
1512 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1513 {
1514 struct vfsopt *opt;
1515
1516 *error = 0;
1517 TAILQ_FOREACH(opt, opts, link) {
1518 if (strcmp(name, opt->name) != 0)
1519 continue;
1520 opt->seen = 1;
1521 if (opt->len == 0 ||
1522 ((char *)opt->value)[opt->len - 1] != '\0') {
1523 *error = EINVAL;
1524 return (NULL);
1525 }
1526 return (opt->value);
1527 }
1528 *error = ENOENT;
1529 return (NULL);
1530 }
1531
1532 int
1533 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1534 uint64_t val)
1535 {
1536 struct vfsopt *opt;
1537
1538 TAILQ_FOREACH(opt, opts, link) {
1539 if (strcmp(name, opt->name) == 0) {
1540 opt->seen = 1;
1541 if (w != NULL)
1542 *w |= val;
1543 return (1);
1544 }
1545 }
1546 if (w != NULL)
1547 *w &= ~val;
1548 return (0);
1549 }
1550
1551 int
1552 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1553 {
1554 va_list ap;
1555 struct vfsopt *opt;
1556 int ret;
1557
1558 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1559
1560 TAILQ_FOREACH(opt, opts, link) {
1561 if (strcmp(name, opt->name) != 0)
1562 continue;
1563 opt->seen = 1;
1564 if (opt->len == 0 || opt->value == NULL)
1565 return (0);
1566 if (((char *)opt->value)[opt->len - 1] != '\0')
1567 return (0);
1568 va_start(ap, fmt);
1569 ret = vsscanf(opt->value, fmt, ap);
1570 va_end(ap);
1571 return (ret);
1572 }
1573 return (0);
1574 }
1575
1576 int
1577 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1578 {
1579 struct vfsopt *opt;
1580
1581 TAILQ_FOREACH(opt, opts, link) {
1582 if (strcmp(name, opt->name) != 0)
1583 continue;
1584 opt->seen = 1;
1585 if (opt->value == NULL)
1586 opt->len = len;
1587 else {
1588 if (opt->len != len)
1589 return (EINVAL);
1590 bcopy(value, opt->value, len);
1591 }
1592 return (0);
1593 }
1594 return (ENOENT);
1595 }
1596
1597 int
1598 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1599 {
1600 struct vfsopt *opt;
1601
1602 TAILQ_FOREACH(opt, opts, link) {
1603 if (strcmp(name, opt->name) != 0)
1604 continue;
1605 opt->seen = 1;
1606 if (opt->value == NULL)
1607 opt->len = len;
1608 else {
1609 if (opt->len < len)
1610 return (EINVAL);
1611 opt->len = len;
1612 bcopy(value, opt->value, len);
1613 }
1614 return (0);
1615 }
1616 return (ENOENT);
1617 }
1618
1619 int
1620 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1621 {
1622 struct vfsopt *opt;
1623
1624 TAILQ_FOREACH(opt, opts, link) {
1625 if (strcmp(name, opt->name) != 0)
1626 continue;
1627 opt->seen = 1;
1628 if (opt->value == NULL)
1629 opt->len = strlen(value) + 1;
1630 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1631 return (EINVAL);
1632 return (0);
1633 }
1634 return (ENOENT);
1635 }
1636
1637 /*
1638 * Find and copy a mount option.
1639 *
1640 * The size of the buffer has to be specified
1641 * in len, if it is not the same length as the
1642 * mount option, EINVAL is returned.
1643 * Returns ENOENT if the option is not found.
1644 */
1645 int
1646 vfs_copyopt(opts, name, dest, len)
1647 struct vfsoptlist *opts;
1648 const char *name;
1649 void *dest;
1650 int len;
1651 {
1652 struct vfsopt *opt;
1653
1654 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1655
1656 TAILQ_FOREACH(opt, opts, link) {
1657 if (strcmp(name, opt->name) == 0) {
1658 opt->seen = 1;
1659 if (len != opt->len)
1660 return (EINVAL);
1661 bcopy(opt->value, dest, opt->len);
1662 return (0);
1663 }
1664 }
1665 return (ENOENT);
1666 }
1667
1668 /*
1669 * These are helper functions for filesystems to traverse all
1670 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h.
1671 *
1672 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL.
1673 */
1674
1675 MALLOC_DECLARE(M_VNODE_MARKER);
1676
1677 struct vnode *
1678 __mnt_vnode_next(struct vnode **mvp, struct mount *mp)
1679 {
1680 struct vnode *vp;
1681
1682 mtx_assert(MNT_MTX(mp), MA_OWNED);
1683
1684 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1685 if (should_yield()) {
1686 MNT_IUNLOCK(mp);
1687 kern_yield(PRI_UNCHANGED);
1688 MNT_ILOCK(mp);
1689 }
1690 vp = TAILQ_NEXT(*mvp, v_nmntvnodes);
1691 while (vp != NULL && vp->v_type == VMARKER)
1692 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1693
1694 /* Check if we are done */
1695 if (vp == NULL) {
1696 __mnt_vnode_markerfree(mvp, mp);
1697 return (NULL);
1698 }
1699 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1700 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1701 return (vp);
1702 }
1703
1704 struct vnode *
1705 __mnt_vnode_first(struct vnode **mvp, struct mount *mp)
1706 {
1707 struct vnode *vp;
1708
1709 mtx_assert(MNT_MTX(mp), MA_OWNED);
1710
1711 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1712 while (vp != NULL && vp->v_type == VMARKER)
1713 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1714
1715 /* Check if we are done */
1716 if (vp == NULL) {
1717 *mvp = NULL;
1718 return (NULL);
1719 }
1720 MNT_REF(mp);
1721 MNT_IUNLOCK(mp);
1722 *mvp = (struct vnode *) malloc(sizeof(struct vnode),
1723 M_VNODE_MARKER,
1724 M_WAITOK | M_ZERO);
1725 MNT_ILOCK(mp);
1726 (*mvp)->v_type = VMARKER;
1727
1728 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1729 while (vp != NULL && vp->v_type == VMARKER)
1730 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1731
1732 /* Check if we are done */
1733 if (vp == NULL) {
1734 MNT_IUNLOCK(mp);
1735 free(*mvp, M_VNODE_MARKER);
1736 MNT_ILOCK(mp);
1737 *mvp = NULL;
1738 MNT_REL(mp);
1739 return (NULL);
1740 }
1741 (*mvp)->v_mount = mp;
1742 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1743 return (vp);
1744 }
1745
1746
1747 void
1748 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp)
1749 {
1750
1751 if (*mvp == NULL)
1752 return;
1753
1754 mtx_assert(MNT_MTX(mp), MA_OWNED);
1755
1756 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1757 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1758 MNT_IUNLOCK(mp);
1759 free(*mvp, M_VNODE_MARKER);
1760 MNT_ILOCK(mp);
1761 *mvp = NULL;
1762 MNT_REL(mp);
1763 }
1764
1765 int
1766 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1767 {
1768 int error;
1769
1770 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1771 if (sbp != &mp->mnt_stat)
1772 *sbp = mp->mnt_stat;
1773 return (error);
1774 }
1775
1776 void
1777 vfs_mountedfrom(struct mount *mp, const char *from)
1778 {
1779
1780 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1781 strlcpy(mp->mnt_stat.f_mntfromname, from,
1782 sizeof mp->mnt_stat.f_mntfromname);
1783 }
1784
1785 /*
1786 * ---------------------------------------------------------------------
1787 * This is the api for building mount args and mounting filesystems from
1788 * inside the kernel.
1789 *
1790 * The API works by accumulation of individual args. First error is
1791 * latched.
1792 *
1793 * XXX: should be documented in new manpage kernel_mount(9)
1794 */
1795
1796 /* A memory allocation which must be freed when we are done */
1797 struct mntaarg {
1798 SLIST_ENTRY(mntaarg) next;
1799 };
1800
1801 /* The header for the mount arguments */
1802 struct mntarg {
1803 struct iovec *v;
1804 int len;
1805 int error;
1806 SLIST_HEAD(, mntaarg) list;
1807 };
1808
1809 /*
1810 * Add a boolean argument.
1811 *
1812 * flag is the boolean value.
1813 * name must start with "no".
1814 */
1815 struct mntarg *
1816 mount_argb(struct mntarg *ma, int flag, const char *name)
1817 {
1818
1819 KASSERT(name[0] == 'n' && name[1] == 'o',
1820 ("mount_argb(...,%s): name must start with 'no'", name));
1821
1822 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1823 }
1824
1825 /*
1826 * Add an argument printf style
1827 */
1828 struct mntarg *
1829 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1830 {
1831 va_list ap;
1832 struct mntaarg *maa;
1833 struct sbuf *sb;
1834 int len;
1835
1836 if (ma == NULL) {
1837 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1838 SLIST_INIT(&ma->list);
1839 }
1840 if (ma->error)
1841 return (ma);
1842
1843 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1844 M_MOUNT, M_WAITOK);
1845 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1846 ma->v[ma->len].iov_len = strlen(name) + 1;
1847 ma->len++;
1848
1849 sb = sbuf_new_auto();
1850 va_start(ap, fmt);
1851 sbuf_vprintf(sb, fmt, ap);
1852 va_end(ap);
1853 sbuf_finish(sb);
1854 len = sbuf_len(sb) + 1;
1855 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1856 SLIST_INSERT_HEAD(&ma->list, maa, next);
1857 bcopy(sbuf_data(sb), maa + 1, len);
1858 sbuf_delete(sb);
1859
1860 ma->v[ma->len].iov_base = maa + 1;
1861 ma->v[ma->len].iov_len = len;
1862 ma->len++;
1863
1864 return (ma);
1865 }
1866
1867 /*
1868 * Add an argument which is a userland string.
1869 */
1870 struct mntarg *
1871 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1872 {
1873 struct mntaarg *maa;
1874 char *tbuf;
1875
1876 if (val == NULL)
1877 return (ma);
1878 if (ma == NULL) {
1879 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1880 SLIST_INIT(&ma->list);
1881 }
1882 if (ma->error)
1883 return (ma);
1884 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1885 SLIST_INSERT_HEAD(&ma->list, maa, next);
1886 tbuf = (void *)(maa + 1);
1887 ma->error = copyinstr(val, tbuf, len, NULL);
1888 return (mount_arg(ma, name, tbuf, -1));
1889 }
1890
1891 /*
1892 * Plain argument.
1893 *
1894 * If length is -1, treat value as a C string.
1895 */
1896 struct mntarg *
1897 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1898 {
1899
1900 if (ma == NULL) {
1901 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1902 SLIST_INIT(&ma->list);
1903 }
1904 if (ma->error)
1905 return (ma);
1906
1907 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1908 M_MOUNT, M_WAITOK);
1909 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1910 ma->v[ma->len].iov_len = strlen(name) + 1;
1911 ma->len++;
1912
1913 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1914 if (len < 0)
1915 ma->v[ma->len].iov_len = strlen(val) + 1;
1916 else
1917 ma->v[ma->len].iov_len = len;
1918 ma->len++;
1919 return (ma);
1920 }
1921
1922 /*
1923 * Free a mntarg structure
1924 */
1925 static void
1926 free_mntarg(struct mntarg *ma)
1927 {
1928 struct mntaarg *maa;
1929
1930 while (!SLIST_EMPTY(&ma->list)) {
1931 maa = SLIST_FIRST(&ma->list);
1932 SLIST_REMOVE_HEAD(&ma->list, next);
1933 free(maa, M_MOUNT);
1934 }
1935 free(ma->v, M_MOUNT);
1936 free(ma, M_MOUNT);
1937 }
1938
1939 /*
1940 * Mount a filesystem
1941 */
1942 int
1943 kernel_mount(struct mntarg *ma, uint64_t flags)
1944 {
1945 struct uio auio;
1946 int error;
1947
1948 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
1949 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
1950 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
1951
1952 auio.uio_iov = ma->v;
1953 auio.uio_iovcnt = ma->len;
1954 auio.uio_segflg = UIO_SYSSPACE;
1955
1956 error = ma->error;
1957 if (!error)
1958 error = vfs_donmount(curthread, flags, &auio);
1959 free_mntarg(ma);
1960 return (error);
1961 }
1962
1963 /*
1964 * A printflike function to mount a filesystem.
1965 */
1966 int
1967 kernel_vmount(int flags, ...)
1968 {
1969 struct mntarg *ma = NULL;
1970 va_list ap;
1971 const char *cp;
1972 const void *vp;
1973 int error;
1974
1975 va_start(ap, flags);
1976 for (;;) {
1977 cp = va_arg(ap, const char *);
1978 if (cp == NULL)
1979 break;
1980 vp = va_arg(ap, const void *);
1981 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
1982 }
1983 va_end(ap);
1984
1985 error = kernel_mount(ma, flags);
1986 return (error);
1987 }
1988
1989 void
1990 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
1991 {
1992
1993 bcopy(oexp, exp, sizeof(*oexp));
1994 exp->ex_numsecflavors = 0;
1995 }
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