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: head/sys/kern/vfs_mount.c 234482 2012-04-20 06:50:44Z mckusick $");
39
40 #include "opt_vfs_allow_nonmpsafe.h"
41
42 #include <sys/param.h>
43 #include <sys/conf.h>
44 #include <sys/fcntl.h>
45 #include <sys/jail.h>
46 #include <sys/kernel.h>
47 #include <sys/libkern.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/mutex.h>
51 #include <sys/namei.h>
52 #include <sys/priv.h>
53 #include <sys/proc.h>
54 #include <sys/filedesc.h>
55 #include <sys/reboot.h>
56 #include <sys/sbuf.h>
57 #include <sys/syscallsubr.h>
58 #include <sys/sysproto.h>
59 #include <sys/sx.h>
60 #include <sys/sysctl.h>
61 #include <sys/sysent.h>
62 #include <sys/systm.h>
63 #include <sys/vnode.h>
64 #include <vm/uma.h>
65
66 #include <geom/geom.h>
67
68 #include <machine/stdarg.h>
69
70 #include <security/audit/audit.h>
71 #include <security/mac/mac_framework.h>
72
73 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
74
75 static int vfs_domount(struct thread *td, const char *fstype, char *fspath,
76 uint64_t fsflags, struct vfsoptlist **optlist);
77 static void free_mntarg(struct mntarg *ma);
78
79 static int usermount = 0;
80 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0,
81 "Unprivileged users may mount and unmount file systems");
82
83 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
84 static uma_zone_t mount_zone;
85
86 /* List of mounted filesystems. */
87 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
88
89 /* For any iteration/modification of mountlist */
90 struct mtx mountlist_mtx;
91 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
92
93 /*
94 * Global opts, taken by all filesystems
95 */
96 static const char *global_opts[] = {
97 "errmsg",
98 "fstype",
99 "fspath",
100 "ro",
101 "rw",
102 "nosuid",
103 "noexec",
104 NULL
105 };
106
107 static int
108 mount_init(void *mem, int size, int flags)
109 {
110 struct mount *mp;
111
112 mp = (struct mount *)mem;
113 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
114 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
115 return (0);
116 }
117
118 static void
119 mount_fini(void *mem, int size)
120 {
121 struct mount *mp;
122
123 mp = (struct mount *)mem;
124 lockdestroy(&mp->mnt_explock);
125 mtx_destroy(&mp->mnt_mtx);
126 }
127
128 static void
129 vfs_mount_init(void *dummy __unused)
130 {
131
132 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
133 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
134 }
135 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
136
137 /*
138 * ---------------------------------------------------------------------
139 * Functions for building and sanitizing the mount options
140 */
141
142 /* Remove one mount option. */
143 static void
144 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
145 {
146
147 TAILQ_REMOVE(opts, opt, link);
148 free(opt->name, M_MOUNT);
149 if (opt->value != NULL)
150 free(opt->value, M_MOUNT);
151 free(opt, M_MOUNT);
152 }
153
154 /* Release all resources related to the mount options. */
155 void
156 vfs_freeopts(struct vfsoptlist *opts)
157 {
158 struct vfsopt *opt;
159
160 while (!TAILQ_EMPTY(opts)) {
161 opt = TAILQ_FIRST(opts);
162 vfs_freeopt(opts, opt);
163 }
164 free(opts, M_MOUNT);
165 }
166
167 void
168 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
169 {
170 struct vfsopt *opt, *temp;
171
172 if (opts == NULL)
173 return;
174 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
175 if (strcmp(opt->name, name) == 0)
176 vfs_freeopt(opts, opt);
177 }
178 }
179
180 static int
181 vfs_isopt_ro(const char *opt)
182 {
183
184 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
185 strcmp(opt, "norw") == 0)
186 return (1);
187 return (0);
188 }
189
190 static int
191 vfs_isopt_rw(const char *opt)
192 {
193
194 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
195 return (1);
196 return (0);
197 }
198
199 /*
200 * Check if options are equal (with or without the "no" prefix).
201 */
202 static int
203 vfs_equalopts(const char *opt1, const char *opt2)
204 {
205 char *p;
206
207 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
208 if (strcmp(opt1, opt2) == 0)
209 return (1);
210 /* "noopt" vs. "opt" */
211 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
212 return (1);
213 /* "opt" vs. "noopt" */
214 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
215 return (1);
216 while ((p = strchr(opt1, '.')) != NULL &&
217 !strncmp(opt1, opt2, ++p - opt1)) {
218 opt2 += p - opt1;
219 opt1 = p;
220 /* "foo.noopt" vs. "foo.opt" */
221 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
222 return (1);
223 /* "foo.opt" vs. "foo.noopt" */
224 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
225 return (1);
226 }
227 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */
228 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
229 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
230 return (1);
231 return (0);
232 }
233
234 /*
235 * If a mount option is specified several times,
236 * (with or without the "no" prefix) only keep
237 * the last occurence of it.
238 */
239 static void
240 vfs_sanitizeopts(struct vfsoptlist *opts)
241 {
242 struct vfsopt *opt, *opt2, *tmp;
243
244 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
245 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
246 while (opt2 != NULL) {
247 if (vfs_equalopts(opt->name, opt2->name)) {
248 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
249 vfs_freeopt(opts, opt2);
250 opt2 = tmp;
251 } else {
252 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
253 }
254 }
255 }
256 }
257
258 /*
259 * Build a linked list of mount options from a struct uio.
260 */
261 int
262 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
263 {
264 struct vfsoptlist *opts;
265 struct vfsopt *opt;
266 size_t memused, namelen, optlen;
267 unsigned int i, iovcnt;
268 int error;
269
270 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
271 TAILQ_INIT(opts);
272 memused = 0;
273 iovcnt = auio->uio_iovcnt;
274 for (i = 0; i < iovcnt; i += 2) {
275 namelen = auio->uio_iov[i].iov_len;
276 optlen = auio->uio_iov[i + 1].iov_len;
277 memused += sizeof(struct vfsopt) + optlen + namelen;
278 /*
279 * Avoid consuming too much memory, and attempts to overflow
280 * memused.
281 */
282 if (memused > VFS_MOUNTARG_SIZE_MAX ||
283 optlen > VFS_MOUNTARG_SIZE_MAX ||
284 namelen > VFS_MOUNTARG_SIZE_MAX) {
285 error = EINVAL;
286 goto bad;
287 }
288
289 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
290 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
291 opt->value = NULL;
292 opt->len = 0;
293 opt->pos = i / 2;
294 opt->seen = 0;
295
296 /*
297 * Do this early, so jumps to "bad" will free the current
298 * option.
299 */
300 TAILQ_INSERT_TAIL(opts, opt, link);
301
302 if (auio->uio_segflg == UIO_SYSSPACE) {
303 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
304 } else {
305 error = copyin(auio->uio_iov[i].iov_base, opt->name,
306 namelen);
307 if (error)
308 goto bad;
309 }
310 /* Ensure names are null-terminated strings. */
311 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
312 error = EINVAL;
313 goto bad;
314 }
315 if (optlen != 0) {
316 opt->len = optlen;
317 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
318 if (auio->uio_segflg == UIO_SYSSPACE) {
319 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
320 optlen);
321 } else {
322 error = copyin(auio->uio_iov[i + 1].iov_base,
323 opt->value, optlen);
324 if (error)
325 goto bad;
326 }
327 }
328 }
329 vfs_sanitizeopts(opts);
330 *options = opts;
331 return (0);
332 bad:
333 vfs_freeopts(opts);
334 return (error);
335 }
336
337 /*
338 * Merge the old mount options with the new ones passed
339 * in the MNT_UPDATE case.
340 *
341 * XXX: This function will keep a "nofoo" option in the new
342 * options. E.g, if the option's canonical name is "foo",
343 * "nofoo" ends up in the mount point's active options.
344 */
345 static void
346 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
347 {
348 struct vfsopt *opt, *new;
349
350 TAILQ_FOREACH(opt, oldopts, link) {
351 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
352 new->name = strdup(opt->name, M_MOUNT);
353 if (opt->len != 0) {
354 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
355 bcopy(opt->value, new->value, opt->len);
356 } else
357 new->value = NULL;
358 new->len = opt->len;
359 new->seen = opt->seen;
360 TAILQ_INSERT_HEAD(toopts, new, link);
361 }
362 vfs_sanitizeopts(toopts);
363 }
364
365 /*
366 * Mount a filesystem.
367 */
368 int
369 sys_nmount(td, uap)
370 struct thread *td;
371 struct nmount_args /* {
372 struct iovec *iovp;
373 unsigned int iovcnt;
374 int flags;
375 } */ *uap;
376 {
377 struct uio *auio;
378 int error;
379 u_int iovcnt;
380 uint64_t flags;
381
382 /*
383 * Mount flags are now 64-bits. On 32-bit archtectures only
384 * 32-bits are passed in, but from here on everything handles
385 * 64-bit flags correctly.
386 */
387 flags = uap->flags;
388
389 AUDIT_ARG_FFLAGS(flags);
390 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
391 uap->iovp, uap->iovcnt, flags);
392
393 /*
394 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
395 * userspace to set this flag, but we must filter it out if we want
396 * MNT_UPDATE on the root file system to work.
397 * MNT_ROOTFS should only be set by the kernel when mounting its
398 * root file system.
399 */
400 flags &= ~MNT_ROOTFS;
401
402 iovcnt = uap->iovcnt;
403 /*
404 * Check that we have an even number of iovec's
405 * and that we have at least two options.
406 */
407 if ((iovcnt & 1) || (iovcnt < 4)) {
408 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
409 uap->iovcnt);
410 return (EINVAL);
411 }
412
413 error = copyinuio(uap->iovp, iovcnt, &auio);
414 if (error) {
415 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
416 __func__, error);
417 return (error);
418 }
419 error = vfs_donmount(td, flags, auio);
420
421 free(auio, M_IOV);
422 return (error);
423 }
424
425 /*
426 * ---------------------------------------------------------------------
427 * Various utility functions
428 */
429
430 void
431 vfs_ref(struct mount *mp)
432 {
433
434 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
435 MNT_ILOCK(mp);
436 MNT_REF(mp);
437 MNT_IUNLOCK(mp);
438 }
439
440 void
441 vfs_rel(struct mount *mp)
442 {
443
444 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
445 MNT_ILOCK(mp);
446 MNT_REL(mp);
447 MNT_IUNLOCK(mp);
448 }
449
450 /*
451 * Allocate and initialize the mount point struct.
452 */
453 struct mount *
454 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
455 struct ucred *cred)
456 {
457 struct mount *mp;
458
459 mp = uma_zalloc(mount_zone, M_WAITOK);
460 bzero(&mp->mnt_startzero,
461 __rangeof(struct mount, mnt_startzero, mnt_endzero));
462 TAILQ_INIT(&mp->mnt_nvnodelist);
463 mp->mnt_nvnodelistsize = 0;
464 TAILQ_INIT(&mp->mnt_activevnodelist);
465 mp->mnt_activevnodelistsize = 0;
466 mp->mnt_ref = 0;
467 (void) vfs_busy(mp, MBF_NOWAIT);
468 mp->mnt_op = vfsp->vfc_vfsops;
469 mp->mnt_vfc = vfsp;
470 vfsp->vfc_refcount++; /* XXX Unlocked */
471 mp->mnt_stat.f_type = vfsp->vfc_typenum;
472 mp->mnt_gen++;
473 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
474 mp->mnt_vnodecovered = vp;
475 mp->mnt_cred = crdup(cred);
476 mp->mnt_stat.f_owner = cred->cr_uid;
477 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
478 mp->mnt_iosize_max = DFLTPHYS;
479 #ifdef MAC
480 mac_mount_init(mp);
481 mac_mount_create(cred, mp);
482 #endif
483 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
484 return (mp);
485 }
486
487 /*
488 * Destroy the mount struct previously allocated by vfs_mount_alloc().
489 */
490 void
491 vfs_mount_destroy(struct mount *mp)
492 {
493
494 MNT_ILOCK(mp);
495 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
496 if (mp->mnt_kern_flag & MNTK_MWAIT) {
497 mp->mnt_kern_flag &= ~MNTK_MWAIT;
498 wakeup(mp);
499 }
500 while (mp->mnt_ref)
501 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
502 KASSERT(mp->mnt_ref == 0,
503 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
504 __FILE__, __LINE__));
505 if (mp->mnt_writeopcount != 0)
506 panic("vfs_mount_destroy: nonzero writeopcount");
507 if (mp->mnt_secondary_writes != 0)
508 panic("vfs_mount_destroy: nonzero secondary_writes");
509 mp->mnt_vfc->vfc_refcount--;
510 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
511 struct vnode *vp;
512
513 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
514 vprint("", vp);
515 panic("unmount: dangling vnode");
516 }
517 if (mp->mnt_nvnodelistsize != 0)
518 panic("vfs_mount_destroy: nonzero nvnodelistsize");
519 if (mp->mnt_activevnodelistsize != 0)
520 panic("vfs_mount_destroy: nonzero activevnodelistsize");
521 if (mp->mnt_lockref != 0)
522 panic("vfs_mount_destroy: nonzero lock refcount");
523 MNT_IUNLOCK(mp);
524 #ifdef MAC
525 mac_mount_destroy(mp);
526 #endif
527 if (mp->mnt_opt != NULL)
528 vfs_freeopts(mp->mnt_opt);
529 crfree(mp->mnt_cred);
530 uma_zfree(mount_zone, mp);
531 }
532
533 int
534 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
535 {
536 struct vfsoptlist *optlist;
537 struct vfsopt *opt, *tmp_opt;
538 char *fstype, *fspath, *errmsg;
539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
540
541 errmsg = fspath = NULL;
542 errmsg_len = fspathlen = 0;
543 errmsg_pos = -1;
544
545 error = vfs_buildopts(fsoptions, &optlist);
546 if (error)
547 return (error);
548
549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
551
552 /*
553 * We need these two options before the others,
554 * and they are mandatory for any filesystem.
555 * Ensure they are NUL terminated as well.
556 */
557 fstypelen = 0;
558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
559 if (error || fstype[fstypelen - 1] != '\0') {
560 error = EINVAL;
561 if (errmsg != NULL)
562 strncpy(errmsg, "Invalid fstype", errmsg_len);
563 goto bail;
564 }
565 fspathlen = 0;
566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
567 if (error || fspath[fspathlen - 1] != '\0') {
568 error = EINVAL;
569 if (errmsg != NULL)
570 strncpy(errmsg, "Invalid fspath", errmsg_len);
571 goto bail;
572 }
573
574 /*
575 * We need to see if we have the "update" option
576 * before we call vfs_domount(), since vfs_domount() has special
577 * logic based on MNT_UPDATE. This is very important
578 * when we want to update the root filesystem.
579 */
580 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
581 if (strcmp(opt->name, "update") == 0) {
582 fsflags |= MNT_UPDATE;
583 vfs_freeopt(optlist, opt);
584 }
585 else if (strcmp(opt->name, "async") == 0)
586 fsflags |= MNT_ASYNC;
587 else if (strcmp(opt->name, "force") == 0) {
588 fsflags |= MNT_FORCE;
589 vfs_freeopt(optlist, opt);
590 }
591 else if (strcmp(opt->name, "reload") == 0) {
592 fsflags |= MNT_RELOAD;
593 vfs_freeopt(optlist, opt);
594 }
595 else if (strcmp(opt->name, "multilabel") == 0)
596 fsflags |= MNT_MULTILABEL;
597 else if (strcmp(opt->name, "noasync") == 0)
598 fsflags &= ~MNT_ASYNC;
599 else if (strcmp(opt->name, "noatime") == 0)
600 fsflags |= MNT_NOATIME;
601 else if (strcmp(opt->name, "atime") == 0) {
602 free(opt->name, M_MOUNT);
603 opt->name = strdup("nonoatime", M_MOUNT);
604 }
605 else if (strcmp(opt->name, "noclusterr") == 0)
606 fsflags |= MNT_NOCLUSTERR;
607 else if (strcmp(opt->name, "clusterr") == 0) {
608 free(opt->name, M_MOUNT);
609 opt->name = strdup("nonoclusterr", M_MOUNT);
610 }
611 else if (strcmp(opt->name, "noclusterw") == 0)
612 fsflags |= MNT_NOCLUSTERW;
613 else if (strcmp(opt->name, "clusterw") == 0) {
614 free(opt->name, M_MOUNT);
615 opt->name = strdup("nonoclusterw", M_MOUNT);
616 }
617 else if (strcmp(opt->name, "noexec") == 0)
618 fsflags |= MNT_NOEXEC;
619 else if (strcmp(opt->name, "exec") == 0) {
620 free(opt->name, M_MOUNT);
621 opt->name = strdup("nonoexec", M_MOUNT);
622 }
623 else if (strcmp(opt->name, "nosuid") == 0)
624 fsflags |= MNT_NOSUID;
625 else if (strcmp(opt->name, "suid") == 0) {
626 free(opt->name, M_MOUNT);
627 opt->name = strdup("nonosuid", M_MOUNT);
628 }
629 else if (strcmp(opt->name, "nosymfollow") == 0)
630 fsflags |= MNT_NOSYMFOLLOW;
631 else if (strcmp(opt->name, "symfollow") == 0) {
632 free(opt->name, M_MOUNT);
633 opt->name = strdup("nonosymfollow", M_MOUNT);
634 }
635 else if (strcmp(opt->name, "noro") == 0)
636 fsflags &= ~MNT_RDONLY;
637 else if (strcmp(opt->name, "rw") == 0)
638 fsflags &= ~MNT_RDONLY;
639 else if (strcmp(opt->name, "ro") == 0)
640 fsflags |= MNT_RDONLY;
641 else if (strcmp(opt->name, "rdonly") == 0) {
642 free(opt->name, M_MOUNT);
643 opt->name = strdup("ro", M_MOUNT);
644 fsflags |= MNT_RDONLY;
645 }
646 else if (strcmp(opt->name, "suiddir") == 0)
647 fsflags |= MNT_SUIDDIR;
648 else if (strcmp(opt->name, "sync") == 0)
649 fsflags |= MNT_SYNCHRONOUS;
650 else if (strcmp(opt->name, "union") == 0)
651 fsflags |= MNT_UNION;
652 }
653
654 /*
655 * Be ultra-paranoid about making sure the type and fspath
656 * variables will fit in our mp buffers, including the
657 * terminating NUL.
658 */
659 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
660 error = ENAMETOOLONG;
661 goto bail;
662 }
663
664 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
665 bail:
666 /* copyout the errmsg */
667 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
668 && errmsg_len > 0 && errmsg != NULL) {
669 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
670 bcopy(errmsg,
671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
673 } else {
674 copyout(errmsg,
675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
677 }
678 }
679
680 if (optlist != NULL)
681 vfs_freeopts(optlist);
682 return (error);
683 }
684
685 /*
686 * Old mount API.
687 */
688 #ifndef _SYS_SYSPROTO_H_
689 struct mount_args {
690 char *type;
691 char *path;
692 int flags;
693 caddr_t data;
694 };
695 #endif
696 /* ARGSUSED */
697 int
698 sys_mount(td, uap)
699 struct thread *td;
700 struct mount_args /* {
701 char *type;
702 char *path;
703 int flags;
704 caddr_t data;
705 } */ *uap;
706 {
707 char *fstype;
708 struct vfsconf *vfsp = NULL;
709 struct mntarg *ma = NULL;
710 uint64_t flags;
711 int error;
712
713 /*
714 * Mount flags are now 64-bits. On 32-bit archtectures only
715 * 32-bits are passed in, but from here on everything handles
716 * 64-bit flags correctly.
717 */
718 flags = uap->flags;
719
720 AUDIT_ARG_FFLAGS(flags);
721
722 /*
723 * Filter out MNT_ROOTFS. We do not want clients of mount() in
724 * userspace to set this flag, but we must filter it out if we want
725 * MNT_UPDATE on the root file system to work.
726 * MNT_ROOTFS should only be set by the kernel when mounting its
727 * root file system.
728 */
729 flags &= ~MNT_ROOTFS;
730
731 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
732 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
733 if (error) {
734 free(fstype, M_TEMP);
735 return (error);
736 }
737
738 AUDIT_ARG_TEXT(fstype);
739 mtx_lock(&Giant);
740 vfsp = vfs_byname_kld(fstype, td, &error);
741 free(fstype, M_TEMP);
742 if (vfsp == NULL) {
743 mtx_unlock(&Giant);
744 return (ENOENT);
745 }
746 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
747 mtx_unlock(&Giant);
748 return (EOPNOTSUPP);
749 }
750
751 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN);
752 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
753 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
754 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
755 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
756
757 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
758 mtx_unlock(&Giant);
759 return (error);
760 }
761
762 /*
763 * vfs_domount_first(): first file system mount (not update)
764 */
765 static int
766 vfs_domount_first(
767 struct thread *td, /* Calling thread. */
768 struct vfsconf *vfsp, /* File system type. */
769 char *fspath, /* Mount path. */
770 struct vnode *vp, /* Vnode to be covered. */
771 uint64_t fsflags, /* Flags common to all filesystems. */
772 struct vfsoptlist **optlist /* Options local to the filesystem. */
773 )
774 {
775 struct vattr va;
776 struct mount *mp;
777 struct vnode *newdp;
778 int error;
779
780 mtx_assert(&Giant, MA_OWNED);
781 ASSERT_VOP_ELOCKED(vp, __func__);
782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
783
784 /*
785 * If the user is not root, ensure that they own the directory
786 * onto which we are attempting to mount.
787 */
788 error = VOP_GETATTR(vp, &va, td->td_ucred);
789 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
790 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
791 if (error == 0)
792 error = vinvalbuf(vp, V_SAVE, 0, 0);
793 if (error == 0 && vp->v_type != VDIR)
794 error = ENOTDIR;
795 if (error == 0) {
796 VI_LOCK(vp);
797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
798 vp->v_iflag |= VI_MOUNT;
799 else
800 error = EBUSY;
801 VI_UNLOCK(vp);
802 }
803 if (error != 0) {
804 vput(vp);
805 return (error);
806 }
807 VOP_UNLOCK(vp, 0);
808
809 /* Allocate and initialize the filesystem. */
810 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
811 /* XXXMAC: pass to vfs_mount_alloc? */
812 mp->mnt_optnew = *optlist;
813 /* Set the mount level flags. */
814 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
815
816 /*
817 * Mount the filesystem.
818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
819 * get. No freeing of cn_pnbuf.
820 */
821 error = VFS_MOUNT(mp);
822 #ifndef VFS_ALLOW_NONMPSAFE
823 if (error == 0 && VFS_NEEDSGIANT(mp)) {
824 (void)VFS_UNMOUNT(mp, fsflags);
825 error = ENXIO;
826 printf("%s: Mounting non-MPSAFE fs (%s) is disabled\n",
827 __func__, mp->mnt_vfc->vfc_name);
828 }
829 #endif
830 if (error != 0) {
831 vfs_unbusy(mp);
832 vfs_mount_destroy(mp);
833 VI_LOCK(vp);
834 vp->v_iflag &= ~VI_MOUNT;
835 VI_UNLOCK(vp);
836 vrele(vp);
837 return (error);
838 }
839 #ifdef VFS_ALLOW_NONMPSAFE
840 if (VFS_NEEDSGIANT(mp))
841 printf("%s: Mounting non-MPSAFE fs (%s) is deprecated\n",
842 __func__, mp->mnt_vfc->vfc_name);
843 #endif
844
845 if (mp->mnt_opt != NULL)
846 vfs_freeopts(mp->mnt_opt);
847 mp->mnt_opt = mp->mnt_optnew;
848 *optlist = NULL;
849 (void)VFS_STATFS(mp, &mp->mnt_stat);
850
851 /*
852 * Prevent external consumers of mount options from reading mnt_optnew.
853 */
854 mp->mnt_optnew = NULL;
855
856 MNT_ILOCK(mp);
857 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
858 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
859 mp->mnt_kern_flag |= MNTK_ASYNC;
860 else
861 mp->mnt_kern_flag &= ~MNTK_ASYNC;
862 MNT_IUNLOCK(mp);
863
864 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
865 cache_purge(vp);
866 VI_LOCK(vp);
867 vp->v_iflag &= ~VI_MOUNT;
868 VI_UNLOCK(vp);
869 vp->v_mountedhere = mp;
870 /* Place the new filesystem at the end of the mount list. */
871 mtx_lock(&mountlist_mtx);
872 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
873 mtx_unlock(&mountlist_mtx);
874 vfs_event_signal(NULL, VQ_MOUNT, 0);
875 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
876 panic("mount: lost mount");
877 VOP_UNLOCK(newdp, 0);
878 VOP_UNLOCK(vp, 0);
879 mountcheckdirs(vp, newdp);
880 vrele(newdp);
881 if ((mp->mnt_flag & MNT_RDONLY) == 0)
882 vfs_allocate_syncvnode(mp);
883 vfs_unbusy(mp);
884 return (0);
885 }
886
887 /*
888 * vfs_domount_update(): update of mounted file system
889 */
890 static int
891 vfs_domount_update(
892 struct thread *td, /* Calling thread. */
893 struct vnode *vp, /* Mount point vnode. */
894 uint64_t fsflags, /* Flags common to all filesystems. */
895 struct vfsoptlist **optlist /* Options local to the filesystem. */
896 )
897 {
898 struct oexport_args oexport;
899 struct export_args export;
900 struct mount *mp;
901 int error, export_error;
902 uint64_t flag;
903
904 mtx_assert(&Giant, MA_OWNED);
905 ASSERT_VOP_ELOCKED(vp, __func__);
906 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
907
908 if ((vp->v_vflag & VV_ROOT) == 0) {
909 vput(vp);
910 return (EINVAL);
911 }
912 mp = vp->v_mount;
913 /*
914 * We only allow the filesystem to be reloaded if it
915 * is currently mounted read-only.
916 */
917 flag = mp->mnt_flag;
918 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
919 vput(vp);
920 return (EOPNOTSUPP); /* Needs translation */
921 }
922 /*
923 * Only privileged root, or (if MNT_USER is set) the user that
924 * did the original mount is permitted to update it.
925 */
926 error = vfs_suser(mp, td);
927 if (error != 0) {
928 vput(vp);
929 return (error);
930 }
931 if (vfs_busy(mp, MBF_NOWAIT)) {
932 vput(vp);
933 return (EBUSY);
934 }
935 VI_LOCK(vp);
936 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
937 VI_UNLOCK(vp);
938 vfs_unbusy(mp);
939 vput(vp);
940 return (EBUSY);
941 }
942 vp->v_iflag |= VI_MOUNT;
943 VI_UNLOCK(vp);
944 VOP_UNLOCK(vp, 0);
945
946 MNT_ILOCK(mp);
947 mp->mnt_flag &= ~MNT_UPDATEMASK;
948 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
949 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
950 if ((mp->mnt_flag & MNT_ASYNC) == 0)
951 mp->mnt_kern_flag &= ~MNTK_ASYNC;
952 MNT_IUNLOCK(mp);
953 mp->mnt_optnew = *optlist;
954 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
955
956 /*
957 * Mount the filesystem.
958 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
959 * get. No freeing of cn_pnbuf.
960 */
961 error = VFS_MOUNT(mp);
962
963 export_error = 0;
964 if (error == 0) {
965 /* Process the export option. */
966 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
967 sizeof(export)) == 0) {
968 export_error = vfs_export(mp, &export);
969 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
970 sizeof(oexport)) == 0) {
971 export.ex_flags = oexport.ex_flags;
972 export.ex_root = oexport.ex_root;
973 export.ex_anon = oexport.ex_anon;
974 export.ex_addr = oexport.ex_addr;
975 export.ex_addrlen = oexport.ex_addrlen;
976 export.ex_mask = oexport.ex_mask;
977 export.ex_masklen = oexport.ex_masklen;
978 export.ex_indexfile = oexport.ex_indexfile;
979 export.ex_numsecflavors = 0;
980 export_error = vfs_export(mp, &export);
981 }
982 }
983
984 MNT_ILOCK(mp);
985 if (error == 0) {
986 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
987 MNT_SNAPSHOT);
988 } else {
989 /*
990 * If we fail, restore old mount flags. MNT_QUOTA is special,
991 * because it is not part of MNT_UPDATEMASK, but it could have
992 * changed in the meantime if quotactl(2) was called.
993 * All in all we want current value of MNT_QUOTA, not the old
994 * one.
995 */
996 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
997 }
998 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
999 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1000 mp->mnt_kern_flag |= MNTK_ASYNC;
1001 else
1002 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1003 MNT_IUNLOCK(mp);
1004
1005 if (error != 0)
1006 goto end;
1007
1008 if (mp->mnt_opt != NULL)
1009 vfs_freeopts(mp->mnt_opt);
1010 mp->mnt_opt = mp->mnt_optnew;
1011 *optlist = NULL;
1012 (void)VFS_STATFS(mp, &mp->mnt_stat);
1013 /*
1014 * Prevent external consumers of mount options from reading
1015 * mnt_optnew.
1016 */
1017 mp->mnt_optnew = NULL;
1018
1019 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1020 vfs_allocate_syncvnode(mp);
1021 else
1022 vfs_deallocate_syncvnode(mp);
1023 end:
1024 vfs_unbusy(mp);
1025 VI_LOCK(vp);
1026 vp->v_iflag &= ~VI_MOUNT;
1027 VI_UNLOCK(vp);
1028 vrele(vp);
1029 return (error != 0 ? error : export_error);
1030 }
1031
1032 /*
1033 * vfs_domount(): actually attempt a filesystem mount.
1034 */
1035 static int
1036 vfs_domount(
1037 struct thread *td, /* Calling thread. */
1038 const char *fstype, /* Filesystem type. */
1039 char *fspath, /* Mount path. */
1040 uint64_t fsflags, /* Flags common to all filesystems. */
1041 struct vfsoptlist **optlist /* Options local to the filesystem. */
1042 )
1043 {
1044 struct vfsconf *vfsp;
1045 struct nameidata nd;
1046 struct vnode *vp;
1047 char *pathbuf;
1048 int error;
1049
1050 /*
1051 * Be ultra-paranoid about making sure the type and fspath
1052 * variables will fit in our mp buffers, including the
1053 * terminating NUL.
1054 */
1055 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1056 return (ENAMETOOLONG);
1057
1058 if (jailed(td->td_ucred) || usermount == 0) {
1059 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1060 return (error);
1061 }
1062
1063 /*
1064 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1065 */
1066 if (fsflags & MNT_EXPORTED) {
1067 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1068 if (error)
1069 return (error);
1070 }
1071 if (fsflags & MNT_SUIDDIR) {
1072 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1073 if (error)
1074 return (error);
1075 }
1076 /*
1077 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1078 */
1079 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1080 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1081 fsflags |= MNT_NOSUID | MNT_USER;
1082 }
1083
1084 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1085 vfsp = NULL;
1086 if ((fsflags & MNT_UPDATE) == 0) {
1087 /* Don't try to load KLDs if we're mounting the root. */
1088 if (fsflags & MNT_ROOTFS)
1089 vfsp = vfs_byname(fstype);
1090 else
1091 vfsp = vfs_byname_kld(fstype, td, &error);
1092 if (vfsp == NULL)
1093 return (ENODEV);
1094 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1095 return (EPERM);
1096 }
1097
1098 /*
1099 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1100 */
1101 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1102 UIO_SYSSPACE, fspath, td);
1103 error = namei(&nd);
1104 if (error != 0)
1105 return (error);
1106 if (!NDHASGIANT(&nd))
1107 mtx_lock(&Giant);
1108 NDFREE(&nd, NDF_ONLY_PNBUF);
1109 vp = nd.ni_vp;
1110 if ((fsflags & MNT_UPDATE) == 0) {
1111 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1112 strcpy(pathbuf, fspath);
1113 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1114 /* debug.disablefullpath == 1 results in ENODEV */
1115 if (error == 0 || error == ENODEV) {
1116 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1117 fsflags, optlist);
1118 }
1119 free(pathbuf, M_TEMP);
1120 } else
1121 error = vfs_domount_update(td, vp, fsflags, optlist);
1122 mtx_unlock(&Giant);
1123
1124 ASSERT_VI_UNLOCKED(vp, __func__);
1125 ASSERT_VOP_UNLOCKED(vp, __func__);
1126
1127 return (error);
1128 }
1129
1130 /*
1131 * Unmount a filesystem.
1132 *
1133 * Note: unmount takes a path to the vnode mounted on as argument, not
1134 * special file (as before).
1135 */
1136 #ifndef _SYS_SYSPROTO_H_
1137 struct unmount_args {
1138 char *path;
1139 int flags;
1140 };
1141 #endif
1142 /* ARGSUSED */
1143 int
1144 sys_unmount(td, uap)
1145 struct thread *td;
1146 register struct unmount_args /* {
1147 char *path;
1148 int flags;
1149 } */ *uap;
1150 {
1151 struct nameidata nd;
1152 struct mount *mp;
1153 char *pathbuf;
1154 int error, id0, id1, vfslocked;
1155
1156 AUDIT_ARG_VALUE(uap->flags);
1157 if (jailed(td->td_ucred) || usermount == 0) {
1158 error = priv_check(td, PRIV_VFS_UNMOUNT);
1159 if (error)
1160 return (error);
1161 }
1162
1163 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1164 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1165 if (error) {
1166 free(pathbuf, M_TEMP);
1167 return (error);
1168 }
1169 mtx_lock(&Giant);
1170 if (uap->flags & MNT_BYFSID) {
1171 AUDIT_ARG_TEXT(pathbuf);
1172 /* Decode the filesystem ID. */
1173 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1174 mtx_unlock(&Giant);
1175 free(pathbuf, M_TEMP);
1176 return (EINVAL);
1177 }
1178
1179 mtx_lock(&mountlist_mtx);
1180 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1181 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1182 mp->mnt_stat.f_fsid.val[1] == id1)
1183 break;
1184 }
1185 mtx_unlock(&mountlist_mtx);
1186 } else {
1187 AUDIT_ARG_UPATH1(td, pathbuf);
1188 /*
1189 * Try to find global path for path argument.
1190 */
1191 NDINIT(&nd, LOOKUP,
1192 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1193 UIO_SYSSPACE, pathbuf, td);
1194 if (namei(&nd) == 0) {
1195 vfslocked = NDHASGIANT(&nd);
1196 NDFREE(&nd, NDF_ONLY_PNBUF);
1197 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1198 MNAMELEN);
1199 if (error == 0 || error == ENODEV)
1200 vput(nd.ni_vp);
1201 VFS_UNLOCK_GIANT(vfslocked);
1202 }
1203 mtx_lock(&mountlist_mtx);
1204 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1205 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1206 break;
1207 }
1208 mtx_unlock(&mountlist_mtx);
1209 }
1210 free(pathbuf, M_TEMP);
1211 if (mp == NULL) {
1212 /*
1213 * Previously we returned ENOENT for a nonexistent path and
1214 * EINVAL for a non-mountpoint. We cannot tell these apart
1215 * now, so in the !MNT_BYFSID case return the more likely
1216 * EINVAL for compatibility.
1217 */
1218 mtx_unlock(&Giant);
1219 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1220 }
1221
1222 /*
1223 * Don't allow unmounting the root filesystem.
1224 */
1225 if (mp->mnt_flag & MNT_ROOTFS) {
1226 mtx_unlock(&Giant);
1227 return (EINVAL);
1228 }
1229 error = dounmount(mp, uap->flags, td);
1230 mtx_unlock(&Giant);
1231 return (error);
1232 }
1233
1234 /*
1235 * Do the actual filesystem unmount.
1236 */
1237 int
1238 dounmount(mp, flags, td)
1239 struct mount *mp;
1240 int flags;
1241 struct thread *td;
1242 {
1243 struct vnode *coveredvp, *fsrootvp;
1244 int error;
1245 uint64_t async_flag;
1246 int mnt_gen_r;
1247
1248 mtx_assert(&Giant, MA_OWNED);
1249
1250 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1251 mnt_gen_r = mp->mnt_gen;
1252 VI_LOCK(coveredvp);
1253 vholdl(coveredvp);
1254 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1255 vdrop(coveredvp);
1256 /*
1257 * Check for mp being unmounted while waiting for the
1258 * covered vnode lock.
1259 */
1260 if (coveredvp->v_mountedhere != mp ||
1261 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1262 VOP_UNLOCK(coveredvp, 0);
1263 return (EBUSY);
1264 }
1265 }
1266 /*
1267 * Only privileged root, or (if MNT_USER is set) the user that did the
1268 * original mount is permitted to unmount this filesystem.
1269 */
1270 error = vfs_suser(mp, td);
1271 if (error) {
1272 if (coveredvp)
1273 VOP_UNLOCK(coveredvp, 0);
1274 return (error);
1275 }
1276
1277 MNT_ILOCK(mp);
1278 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
1279 MNT_IUNLOCK(mp);
1280 if (coveredvp)
1281 VOP_UNLOCK(coveredvp, 0);
1282 return (EBUSY);
1283 }
1284 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1285 /* Allow filesystems to detect that a forced unmount is in progress. */
1286 if (flags & MNT_FORCE)
1287 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1288 error = 0;
1289 if (mp->mnt_lockref) {
1290 mp->mnt_kern_flag |= MNTK_DRAINING;
1291 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1292 "mount drain", 0);
1293 }
1294 MNT_IUNLOCK(mp);
1295 KASSERT(mp->mnt_lockref == 0,
1296 ("%s: invalid lock refcount in the drain path @ %s:%d",
1297 __func__, __FILE__, __LINE__));
1298 KASSERT(error == 0,
1299 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1300 __func__, __FILE__, __LINE__));
1301 vn_start_write(NULL, &mp, V_WAIT);
1302
1303 if (mp->mnt_flag & MNT_EXPUBLIC)
1304 vfs_setpublicfs(NULL, NULL, NULL);
1305
1306 vfs_msync(mp, MNT_WAIT);
1307 MNT_ILOCK(mp);
1308 async_flag = mp->mnt_flag & MNT_ASYNC;
1309 mp->mnt_flag &= ~MNT_ASYNC;
1310 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1311 MNT_IUNLOCK(mp);
1312 cache_purgevfs(mp); /* remove cache entries for this file sys */
1313 vfs_deallocate_syncvnode(mp);
1314 /*
1315 * For forced unmounts, move process cdir/rdir refs on the fs root
1316 * vnode to the covered vnode. For non-forced unmounts we want
1317 * such references to cause an EBUSY error.
1318 */
1319 if ((flags & MNT_FORCE) &&
1320 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1321 if (mp->mnt_vnodecovered != NULL)
1322 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1323 if (fsrootvp == rootvnode) {
1324 vrele(rootvnode);
1325 rootvnode = NULL;
1326 }
1327 vput(fsrootvp);
1328 }
1329 if (((mp->mnt_flag & MNT_RDONLY) ||
1330 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0)
1331 error = VFS_UNMOUNT(mp, flags);
1332 vn_finished_write(mp);
1333 /*
1334 * If we failed to flush the dirty blocks for this mount point,
1335 * undo all the cdir/rdir and rootvnode changes we made above.
1336 * Unless we failed to do so because the device is reporting that
1337 * it doesn't exist anymore.
1338 */
1339 if (error && error != ENXIO) {
1340 if ((flags & MNT_FORCE) &&
1341 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1342 if (mp->mnt_vnodecovered != NULL)
1343 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1344 if (rootvnode == NULL) {
1345 rootvnode = fsrootvp;
1346 vref(rootvnode);
1347 }
1348 vput(fsrootvp);
1349 }
1350 MNT_ILOCK(mp);
1351 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1352 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1353 MNT_IUNLOCK(mp);
1354 vfs_allocate_syncvnode(mp);
1355 MNT_ILOCK(mp);
1356 }
1357 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1358 mp->mnt_flag |= async_flag;
1359 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1360 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1361 mp->mnt_kern_flag |= MNTK_ASYNC;
1362 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1363 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1364 wakeup(mp);
1365 }
1366 MNT_IUNLOCK(mp);
1367 if (coveredvp)
1368 VOP_UNLOCK(coveredvp, 0);
1369 return (error);
1370 }
1371 mtx_lock(&mountlist_mtx);
1372 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1373 mtx_unlock(&mountlist_mtx);
1374 if (coveredvp != NULL) {
1375 coveredvp->v_mountedhere = NULL;
1376 vput(coveredvp);
1377 }
1378 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1379 vfs_mount_destroy(mp);
1380 return (0);
1381 }
1382
1383 /*
1384 * Report errors during filesystem mounting.
1385 */
1386 void
1387 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1388 {
1389 struct vfsoptlist *moptlist = mp->mnt_optnew;
1390 va_list ap;
1391 int error, len;
1392 char *errmsg;
1393
1394 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1395 if (error || errmsg == NULL || len <= 0)
1396 return;
1397
1398 va_start(ap, fmt);
1399 vsnprintf(errmsg, (size_t)len, fmt, ap);
1400 va_end(ap);
1401 }
1402
1403 void
1404 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1405 {
1406 va_list ap;
1407 int error, len;
1408 char *errmsg;
1409
1410 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1411 if (error || errmsg == NULL || len <= 0)
1412 return;
1413
1414 va_start(ap, fmt);
1415 vsnprintf(errmsg, (size_t)len, fmt, ap);
1416 va_end(ap);
1417 }
1418
1419 /*
1420 * ---------------------------------------------------------------------
1421 * Functions for querying mount options/arguments from filesystems.
1422 */
1423
1424 /*
1425 * Check that no unknown options are given
1426 */
1427 int
1428 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1429 {
1430 struct vfsopt *opt;
1431 char errmsg[255];
1432 const char **t, *p, *q;
1433 int ret = 0;
1434
1435 TAILQ_FOREACH(opt, opts, link) {
1436 p = opt->name;
1437 q = NULL;
1438 if (p[0] == 'n' && p[1] == 'o')
1439 q = p + 2;
1440 for(t = global_opts; *t != NULL; t++) {
1441 if (strcmp(*t, p) == 0)
1442 break;
1443 if (q != NULL) {
1444 if (strcmp(*t, q) == 0)
1445 break;
1446 }
1447 }
1448 if (*t != NULL)
1449 continue;
1450 for(t = legal; *t != NULL; t++) {
1451 if (strcmp(*t, p) == 0)
1452 break;
1453 if (q != NULL) {
1454 if (strcmp(*t, q) == 0)
1455 break;
1456 }
1457 }
1458 if (*t != NULL)
1459 continue;
1460 snprintf(errmsg, sizeof(errmsg),
1461 "mount option <%s> is unknown", p);
1462 ret = EINVAL;
1463 }
1464 if (ret != 0) {
1465 TAILQ_FOREACH(opt, opts, link) {
1466 if (strcmp(opt->name, "errmsg") == 0) {
1467 strncpy((char *)opt->value, errmsg, opt->len);
1468 break;
1469 }
1470 }
1471 if (opt == NULL)
1472 printf("%s\n", errmsg);
1473 }
1474 return (ret);
1475 }
1476
1477 /*
1478 * Get a mount option by its name.
1479 *
1480 * Return 0 if the option was found, ENOENT otherwise.
1481 * If len is non-NULL it will be filled with the length
1482 * of the option. If buf is non-NULL, it will be filled
1483 * with the address of the option.
1484 */
1485 int
1486 vfs_getopt(opts, name, buf, len)
1487 struct vfsoptlist *opts;
1488 const char *name;
1489 void **buf;
1490 int *len;
1491 {
1492 struct vfsopt *opt;
1493
1494 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1495
1496 TAILQ_FOREACH(opt, opts, link) {
1497 if (strcmp(name, opt->name) == 0) {
1498 opt->seen = 1;
1499 if (len != NULL)
1500 *len = opt->len;
1501 if (buf != NULL)
1502 *buf = opt->value;
1503 return (0);
1504 }
1505 }
1506 return (ENOENT);
1507 }
1508
1509 int
1510 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1511 {
1512 struct vfsopt *opt;
1513
1514 if (opts == NULL)
1515 return (-1);
1516
1517 TAILQ_FOREACH(opt, opts, link) {
1518 if (strcmp(name, opt->name) == 0) {
1519 opt->seen = 1;
1520 return (opt->pos);
1521 }
1522 }
1523 return (-1);
1524 }
1525
1526 int
1527 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1528 {
1529 char *opt_value, *vtp;
1530 quad_t iv;
1531 int error, opt_len;
1532
1533 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1534 if (error != 0)
1535 return (error);
1536 if (opt_len == 0 || opt_value == NULL)
1537 return (EINVAL);
1538 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1539 return (EINVAL);
1540 iv = strtoq(opt_value, &vtp, 0);
1541 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1542 return (EINVAL);
1543 if (iv < 0)
1544 return (EINVAL);
1545 switch (vtp[0]) {
1546 case 't':
1547 case 'T':
1548 iv *= 1024;
1549 case 'g':
1550 case 'G':
1551 iv *= 1024;
1552 case 'm':
1553 case 'M':
1554 iv *= 1024;
1555 case 'k':
1556 case 'K':
1557 iv *= 1024;
1558 case '\0':
1559 break;
1560 default:
1561 return (EINVAL);
1562 }
1563 *value = iv;
1564
1565 return (0);
1566 }
1567
1568 char *
1569 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1570 {
1571 struct vfsopt *opt;
1572
1573 *error = 0;
1574 TAILQ_FOREACH(opt, opts, link) {
1575 if (strcmp(name, opt->name) != 0)
1576 continue;
1577 opt->seen = 1;
1578 if (opt->len == 0 ||
1579 ((char *)opt->value)[opt->len - 1] != '\0') {
1580 *error = EINVAL;
1581 return (NULL);
1582 }
1583 return (opt->value);
1584 }
1585 *error = ENOENT;
1586 return (NULL);
1587 }
1588
1589 int
1590 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1591 uint64_t val)
1592 {
1593 struct vfsopt *opt;
1594
1595 TAILQ_FOREACH(opt, opts, link) {
1596 if (strcmp(name, opt->name) == 0) {
1597 opt->seen = 1;
1598 if (w != NULL)
1599 *w |= val;
1600 return (1);
1601 }
1602 }
1603 if (w != NULL)
1604 *w &= ~val;
1605 return (0);
1606 }
1607
1608 int
1609 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1610 {
1611 va_list ap;
1612 struct vfsopt *opt;
1613 int ret;
1614
1615 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1616
1617 TAILQ_FOREACH(opt, opts, link) {
1618 if (strcmp(name, opt->name) != 0)
1619 continue;
1620 opt->seen = 1;
1621 if (opt->len == 0 || opt->value == NULL)
1622 return (0);
1623 if (((char *)opt->value)[opt->len - 1] != '\0')
1624 return (0);
1625 va_start(ap, fmt);
1626 ret = vsscanf(opt->value, fmt, ap);
1627 va_end(ap);
1628 return (ret);
1629 }
1630 return (0);
1631 }
1632
1633 int
1634 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1635 {
1636 struct vfsopt *opt;
1637
1638 TAILQ_FOREACH(opt, opts, link) {
1639 if (strcmp(name, opt->name) != 0)
1640 continue;
1641 opt->seen = 1;
1642 if (opt->value == NULL)
1643 opt->len = len;
1644 else {
1645 if (opt->len != len)
1646 return (EINVAL);
1647 bcopy(value, opt->value, len);
1648 }
1649 return (0);
1650 }
1651 return (ENOENT);
1652 }
1653
1654 int
1655 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1656 {
1657 struct vfsopt *opt;
1658
1659 TAILQ_FOREACH(opt, opts, link) {
1660 if (strcmp(name, opt->name) != 0)
1661 continue;
1662 opt->seen = 1;
1663 if (opt->value == NULL)
1664 opt->len = len;
1665 else {
1666 if (opt->len < len)
1667 return (EINVAL);
1668 opt->len = len;
1669 bcopy(value, opt->value, len);
1670 }
1671 return (0);
1672 }
1673 return (ENOENT);
1674 }
1675
1676 int
1677 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1678 {
1679 struct vfsopt *opt;
1680
1681 TAILQ_FOREACH(opt, opts, link) {
1682 if (strcmp(name, opt->name) != 0)
1683 continue;
1684 opt->seen = 1;
1685 if (opt->value == NULL)
1686 opt->len = strlen(value) + 1;
1687 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1688 return (EINVAL);
1689 return (0);
1690 }
1691 return (ENOENT);
1692 }
1693
1694 /*
1695 * Find and copy a mount option.
1696 *
1697 * The size of the buffer has to be specified
1698 * in len, if it is not the same length as the
1699 * mount option, EINVAL is returned.
1700 * Returns ENOENT if the option is not found.
1701 */
1702 int
1703 vfs_copyopt(opts, name, dest, len)
1704 struct vfsoptlist *opts;
1705 const char *name;
1706 void *dest;
1707 int len;
1708 {
1709 struct vfsopt *opt;
1710
1711 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1712
1713 TAILQ_FOREACH(opt, opts, link) {
1714 if (strcmp(name, opt->name) == 0) {
1715 opt->seen = 1;
1716 if (len != opt->len)
1717 return (EINVAL);
1718 bcopy(opt->value, dest, opt->len);
1719 return (0);
1720 }
1721 }
1722 return (ENOENT);
1723 }
1724
1725 /*
1726 * These are helper functions for filesystems to traverse all
1727 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h.
1728 *
1729 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL.
1730 */
1731
1732 MALLOC_DECLARE(M_VNODE_MARKER);
1733
1734 struct vnode *
1735 __mnt_vnode_next(struct vnode **mvp, struct mount *mp)
1736 {
1737 struct vnode *vp;
1738
1739 mtx_assert(MNT_MTX(mp), MA_OWNED);
1740
1741 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1742 if (should_yield()) {
1743 MNT_IUNLOCK(mp);
1744 kern_yield(PRI_UNCHANGED);
1745 MNT_ILOCK(mp);
1746 }
1747 vp = TAILQ_NEXT(*mvp, v_nmntvnodes);
1748 while (vp != NULL && vp->v_type == VMARKER)
1749 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1750
1751 /* Check if we are done */
1752 if (vp == NULL) {
1753 __mnt_vnode_markerfree(mvp, mp);
1754 return (NULL);
1755 }
1756 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1757 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1758 return (vp);
1759 }
1760
1761 struct vnode *
1762 __mnt_vnode_first(struct vnode **mvp, struct mount *mp)
1763 {
1764 struct vnode *vp;
1765
1766 mtx_assert(MNT_MTX(mp), MA_OWNED);
1767
1768 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1769 while (vp != NULL && vp->v_type == VMARKER)
1770 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1771
1772 /* Check if we are done */
1773 if (vp == NULL) {
1774 *mvp = NULL;
1775 return (NULL);
1776 }
1777 MNT_REF(mp);
1778 MNT_IUNLOCK(mp);
1779 *mvp = (struct vnode *) malloc(sizeof(struct vnode),
1780 M_VNODE_MARKER,
1781 M_WAITOK | M_ZERO);
1782 MNT_ILOCK(mp);
1783 (*mvp)->v_type = VMARKER;
1784
1785 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1786 while (vp != NULL && vp->v_type == VMARKER)
1787 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1788
1789 /* Check if we are done */
1790 if (vp == NULL) {
1791 MNT_IUNLOCK(mp);
1792 free(*mvp, M_VNODE_MARKER);
1793 MNT_ILOCK(mp);
1794 *mvp = NULL;
1795 MNT_REL(mp);
1796 return (NULL);
1797 }
1798 (*mvp)->v_mount = mp;
1799 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1800 return (vp);
1801 }
1802
1803
1804 void
1805 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp)
1806 {
1807
1808 if (*mvp == NULL)
1809 return;
1810
1811 mtx_assert(MNT_MTX(mp), MA_OWNED);
1812
1813 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1814 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1815 MNT_IUNLOCK(mp);
1816 free(*mvp, M_VNODE_MARKER);
1817 MNT_ILOCK(mp);
1818 *mvp = NULL;
1819 MNT_REL(mp);
1820 }
1821
1822 int
1823 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1824 {
1825 int error;
1826
1827 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1828 if (sbp != &mp->mnt_stat)
1829 *sbp = mp->mnt_stat;
1830 return (error);
1831 }
1832
1833 void
1834 vfs_mountedfrom(struct mount *mp, const char *from)
1835 {
1836
1837 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1838 strlcpy(mp->mnt_stat.f_mntfromname, from,
1839 sizeof mp->mnt_stat.f_mntfromname);
1840 }
1841
1842 /*
1843 * ---------------------------------------------------------------------
1844 * This is the api for building mount args and mounting filesystems from
1845 * inside the kernel.
1846 *
1847 * The API works by accumulation of individual args. First error is
1848 * latched.
1849 *
1850 * XXX: should be documented in new manpage kernel_mount(9)
1851 */
1852
1853 /* A memory allocation which must be freed when we are done */
1854 struct mntaarg {
1855 SLIST_ENTRY(mntaarg) next;
1856 };
1857
1858 /* The header for the mount arguments */
1859 struct mntarg {
1860 struct iovec *v;
1861 int len;
1862 int error;
1863 SLIST_HEAD(, mntaarg) list;
1864 };
1865
1866 /*
1867 * Add a boolean argument.
1868 *
1869 * flag is the boolean value.
1870 * name must start with "no".
1871 */
1872 struct mntarg *
1873 mount_argb(struct mntarg *ma, int flag, const char *name)
1874 {
1875
1876 KASSERT(name[0] == 'n' && name[1] == 'o',
1877 ("mount_argb(...,%s): name must start with 'no'", name));
1878
1879 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1880 }
1881
1882 /*
1883 * Add an argument printf style
1884 */
1885 struct mntarg *
1886 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1887 {
1888 va_list ap;
1889 struct mntaarg *maa;
1890 struct sbuf *sb;
1891 int len;
1892
1893 if (ma == NULL) {
1894 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1895 SLIST_INIT(&ma->list);
1896 }
1897 if (ma->error)
1898 return (ma);
1899
1900 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1901 M_MOUNT, M_WAITOK);
1902 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1903 ma->v[ma->len].iov_len = strlen(name) + 1;
1904 ma->len++;
1905
1906 sb = sbuf_new_auto();
1907 va_start(ap, fmt);
1908 sbuf_vprintf(sb, fmt, ap);
1909 va_end(ap);
1910 sbuf_finish(sb);
1911 len = sbuf_len(sb) + 1;
1912 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1913 SLIST_INSERT_HEAD(&ma->list, maa, next);
1914 bcopy(sbuf_data(sb), maa + 1, len);
1915 sbuf_delete(sb);
1916
1917 ma->v[ma->len].iov_base = maa + 1;
1918 ma->v[ma->len].iov_len = len;
1919 ma->len++;
1920
1921 return (ma);
1922 }
1923
1924 /*
1925 * Add an argument which is a userland string.
1926 */
1927 struct mntarg *
1928 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1929 {
1930 struct mntaarg *maa;
1931 char *tbuf;
1932
1933 if (val == NULL)
1934 return (ma);
1935 if (ma == NULL) {
1936 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1937 SLIST_INIT(&ma->list);
1938 }
1939 if (ma->error)
1940 return (ma);
1941 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1942 SLIST_INSERT_HEAD(&ma->list, maa, next);
1943 tbuf = (void *)(maa + 1);
1944 ma->error = copyinstr(val, tbuf, len, NULL);
1945 return (mount_arg(ma, name, tbuf, -1));
1946 }
1947
1948 /*
1949 * Plain argument.
1950 *
1951 * If length is -1, treat value as a C string.
1952 */
1953 struct mntarg *
1954 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1955 {
1956
1957 if (ma == NULL) {
1958 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1959 SLIST_INIT(&ma->list);
1960 }
1961 if (ma->error)
1962 return (ma);
1963
1964 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1965 M_MOUNT, M_WAITOK);
1966 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1967 ma->v[ma->len].iov_len = strlen(name) + 1;
1968 ma->len++;
1969
1970 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1971 if (len < 0)
1972 ma->v[ma->len].iov_len = strlen(val) + 1;
1973 else
1974 ma->v[ma->len].iov_len = len;
1975 ma->len++;
1976 return (ma);
1977 }
1978
1979 /*
1980 * Free a mntarg structure
1981 */
1982 static void
1983 free_mntarg(struct mntarg *ma)
1984 {
1985 struct mntaarg *maa;
1986
1987 while (!SLIST_EMPTY(&ma->list)) {
1988 maa = SLIST_FIRST(&ma->list);
1989 SLIST_REMOVE_HEAD(&ma->list, next);
1990 free(maa, M_MOUNT);
1991 }
1992 free(ma->v, M_MOUNT);
1993 free(ma, M_MOUNT);
1994 }
1995
1996 /*
1997 * Mount a filesystem
1998 */
1999 int
2000 kernel_mount(struct mntarg *ma, uint64_t flags)
2001 {
2002 struct uio auio;
2003 int error;
2004
2005 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
2006 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
2007 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
2008
2009 auio.uio_iov = ma->v;
2010 auio.uio_iovcnt = ma->len;
2011 auio.uio_segflg = UIO_SYSSPACE;
2012
2013 error = ma->error;
2014 if (!error)
2015 error = vfs_donmount(curthread, flags, &auio);
2016 free_mntarg(ma);
2017 return (error);
2018 }
2019
2020 /*
2021 * A printflike function to mount a filesystem.
2022 */
2023 int
2024 kernel_vmount(int flags, ...)
2025 {
2026 struct mntarg *ma = NULL;
2027 va_list ap;
2028 const char *cp;
2029 const void *vp;
2030 int error;
2031
2032 va_start(ap, flags);
2033 for (;;) {
2034 cp = va_arg(ap, const char *);
2035 if (cp == NULL)
2036 break;
2037 vp = va_arg(ap, const void *);
2038 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
2039 }
2040 va_end(ap);
2041
2042 error = kernel_mount(ma, flags);
2043 return (error);
2044 }
2045
2046 void
2047 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
2048 {
2049
2050 bcopy(oexp, exp, sizeof(*oexp));
2051 exp->ex_numsecflavors = 0;
2052 }
Cache object: e7814fc474028e18cda091d7a7258251
|