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/11.2/sys/kern/vfs_mount.c 332753 2018-04-19 05:37:32Z avg $");
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 static bool default_autoro = false;
82 SYSCTL_BOOL(_vfs, OID_AUTO, default_autoro, CTLFLAG_RW, &default_autoro, 0,
83 "Retry failed r/w mount as r/o if no explicit ro/rw option is specified");
84
85 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
86 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure");
87 static uma_zone_t mount_zone;
88
89 /* List of mounted filesystems. */
90 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
91
92 /* For any iteration/modification of mountlist */
93 struct mtx mountlist_mtx;
94 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
95
96 /*
97 * Global opts, taken by all filesystems
98 */
99 static const char *global_opts[] = {
100 "errmsg",
101 "fstype",
102 "fspath",
103 "ro",
104 "rw",
105 "nosuid",
106 "noexec",
107 NULL
108 };
109
110 static int
111 mount_init(void *mem, int size, int flags)
112 {
113 struct mount *mp;
114
115 mp = (struct mount *)mem;
116 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
117 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
118 return (0);
119 }
120
121 static void
122 mount_fini(void *mem, int size)
123 {
124 struct mount *mp;
125
126 mp = (struct mount *)mem;
127 lockdestroy(&mp->mnt_explock);
128 mtx_destroy(&mp->mnt_mtx);
129 }
130
131 static void
132 vfs_mount_init(void *dummy __unused)
133 {
134
135 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
136 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
137 }
138 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
139
140 /*
141 * ---------------------------------------------------------------------
142 * Functions for building and sanitizing the mount options
143 */
144
145 /* Remove one mount option. */
146 static void
147 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
148 {
149
150 TAILQ_REMOVE(opts, opt, link);
151 free(opt->name, M_MOUNT);
152 if (opt->value != NULL)
153 free(opt->value, M_MOUNT);
154 free(opt, M_MOUNT);
155 }
156
157 /* Release all resources related to the mount options. */
158 void
159 vfs_freeopts(struct vfsoptlist *opts)
160 {
161 struct vfsopt *opt;
162
163 while (!TAILQ_EMPTY(opts)) {
164 opt = TAILQ_FIRST(opts);
165 vfs_freeopt(opts, opt);
166 }
167 free(opts, M_MOUNT);
168 }
169
170 void
171 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
172 {
173 struct vfsopt *opt, *temp;
174
175 if (opts == NULL)
176 return;
177 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
178 if (strcmp(opt->name, name) == 0)
179 vfs_freeopt(opts, opt);
180 }
181 }
182
183 static int
184 vfs_isopt_ro(const char *opt)
185 {
186
187 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
188 strcmp(opt, "norw") == 0)
189 return (1);
190 return (0);
191 }
192
193 static int
194 vfs_isopt_rw(const char *opt)
195 {
196
197 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
198 return (1);
199 return (0);
200 }
201
202 /*
203 * Check if options are equal (with or without the "no" prefix).
204 */
205 static int
206 vfs_equalopts(const char *opt1, const char *opt2)
207 {
208 char *p;
209
210 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
211 if (strcmp(opt1, opt2) == 0)
212 return (1);
213 /* "noopt" vs. "opt" */
214 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
215 return (1);
216 /* "opt" vs. "noopt" */
217 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
218 return (1);
219 while ((p = strchr(opt1, '.')) != NULL &&
220 !strncmp(opt1, opt2, ++p - opt1)) {
221 opt2 += p - opt1;
222 opt1 = p;
223 /* "foo.noopt" vs. "foo.opt" */
224 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
225 return (1);
226 /* "foo.opt" vs. "foo.noopt" */
227 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
228 return (1);
229 }
230 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */
231 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
232 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
233 return (1);
234 return (0);
235 }
236
237 /*
238 * If a mount option is specified several times,
239 * (with or without the "no" prefix) only keep
240 * the last occurrence of it.
241 */
242 static void
243 vfs_sanitizeopts(struct vfsoptlist *opts)
244 {
245 struct vfsopt *opt, *opt2, *tmp;
246
247 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
248 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
249 while (opt2 != NULL) {
250 if (vfs_equalopts(opt->name, opt2->name)) {
251 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
252 vfs_freeopt(opts, opt2);
253 opt2 = tmp;
254 } else {
255 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
256 }
257 }
258 }
259 }
260
261 /*
262 * Build a linked list of mount options from a struct uio.
263 */
264 int
265 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
266 {
267 struct vfsoptlist *opts;
268 struct vfsopt *opt;
269 size_t memused, namelen, optlen;
270 unsigned int i, iovcnt;
271 int error;
272
273 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
274 TAILQ_INIT(opts);
275 memused = 0;
276 iovcnt = auio->uio_iovcnt;
277 for (i = 0; i < iovcnt; i += 2) {
278 namelen = auio->uio_iov[i].iov_len;
279 optlen = auio->uio_iov[i + 1].iov_len;
280 memused += sizeof(struct vfsopt) + optlen + namelen;
281 /*
282 * Avoid consuming too much memory, and attempts to overflow
283 * memused.
284 */
285 if (memused > VFS_MOUNTARG_SIZE_MAX ||
286 optlen > VFS_MOUNTARG_SIZE_MAX ||
287 namelen > VFS_MOUNTARG_SIZE_MAX) {
288 error = EINVAL;
289 goto bad;
290 }
291
292 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
293 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
294 opt->value = NULL;
295 opt->len = 0;
296 opt->pos = i / 2;
297 opt->seen = 0;
298
299 /*
300 * Do this early, so jumps to "bad" will free the current
301 * option.
302 */
303 TAILQ_INSERT_TAIL(opts, opt, link);
304
305 if (auio->uio_segflg == UIO_SYSSPACE) {
306 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
307 } else {
308 error = copyin(auio->uio_iov[i].iov_base, opt->name,
309 namelen);
310 if (error)
311 goto bad;
312 }
313 /* Ensure names are null-terminated strings. */
314 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
315 error = EINVAL;
316 goto bad;
317 }
318 if (optlen != 0) {
319 opt->len = optlen;
320 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
321 if (auio->uio_segflg == UIO_SYSSPACE) {
322 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
323 optlen);
324 } else {
325 error = copyin(auio->uio_iov[i + 1].iov_base,
326 opt->value, optlen);
327 if (error)
328 goto bad;
329 }
330 }
331 }
332 vfs_sanitizeopts(opts);
333 *options = opts;
334 return (0);
335 bad:
336 vfs_freeopts(opts);
337 return (error);
338 }
339
340 /*
341 * Merge the old mount options with the new ones passed
342 * in the MNT_UPDATE case.
343 *
344 * XXX: This function will keep a "nofoo" option in the new
345 * options. E.g, if the option's canonical name is "foo",
346 * "nofoo" ends up in the mount point's active options.
347 */
348 static void
349 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
350 {
351 struct vfsopt *opt, *new;
352
353 TAILQ_FOREACH(opt, oldopts, link) {
354 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
355 new->name = strdup(opt->name, M_MOUNT);
356 if (opt->len != 0) {
357 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
358 bcopy(opt->value, new->value, opt->len);
359 } else
360 new->value = NULL;
361 new->len = opt->len;
362 new->seen = opt->seen;
363 TAILQ_INSERT_HEAD(toopts, new, link);
364 }
365 vfs_sanitizeopts(toopts);
366 }
367
368 /*
369 * Mount a filesystem.
370 */
371 #ifndef _SYS_SYSPROTO_H_
372 struct nmount_args {
373 struct iovec *iovp;
374 unsigned int iovcnt;
375 int flags;
376 };
377 #endif
378 int
379 sys_nmount(struct thread *td, struct nmount_args *uap)
380 {
381 struct uio *auio;
382 int error;
383 u_int iovcnt;
384 uint64_t flags;
385
386 /*
387 * Mount flags are now 64-bits. On 32-bit archtectures only
388 * 32-bits are passed in, but from here on everything handles
389 * 64-bit flags correctly.
390 */
391 flags = uap->flags;
392
393 AUDIT_ARG_FFLAGS(flags);
394 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
395 uap->iovp, uap->iovcnt, flags);
396
397 /*
398 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
399 * userspace to set this flag, but we must filter it out if we want
400 * MNT_UPDATE on the root file system to work.
401 * MNT_ROOTFS should only be set by the kernel when mounting its
402 * root file system.
403 */
404 flags &= ~MNT_ROOTFS;
405
406 iovcnt = uap->iovcnt;
407 /*
408 * Check that we have an even number of iovec's
409 * and that we have at least two options.
410 */
411 if ((iovcnt & 1) || (iovcnt < 4)) {
412 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
413 uap->iovcnt);
414 return (EINVAL);
415 }
416
417 error = copyinuio(uap->iovp, iovcnt, &auio);
418 if (error) {
419 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
420 __func__, error);
421 return (error);
422 }
423 error = vfs_donmount(td, flags, auio);
424
425 free(auio, M_IOV);
426 return (error);
427 }
428
429 /*
430 * ---------------------------------------------------------------------
431 * Various utility functions
432 */
433
434 void
435 vfs_ref(struct mount *mp)
436 {
437
438 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
439 MNT_ILOCK(mp);
440 MNT_REF(mp);
441 MNT_IUNLOCK(mp);
442 }
443
444 void
445 vfs_rel(struct mount *mp)
446 {
447
448 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
449 MNT_ILOCK(mp);
450 MNT_REL(mp);
451 MNT_IUNLOCK(mp);
452 }
453
454 /*
455 * Allocate and initialize the mount point struct.
456 */
457 struct mount *
458 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
459 struct ucred *cred)
460 {
461 struct mount *mp;
462
463 mp = uma_zalloc(mount_zone, M_WAITOK);
464 bzero(&mp->mnt_startzero,
465 __rangeof(struct mount, mnt_startzero, mnt_endzero));
466 TAILQ_INIT(&mp->mnt_nvnodelist);
467 mp->mnt_nvnodelistsize = 0;
468 TAILQ_INIT(&mp->mnt_activevnodelist);
469 mp->mnt_activevnodelistsize = 0;
470 mp->mnt_ref = 0;
471 (void) vfs_busy(mp, MBF_NOWAIT);
472 atomic_add_acq_int(&vfsp->vfc_refcount, 1);
473 mp->mnt_op = vfsp->vfc_vfsops;
474 mp->mnt_vfc = vfsp;
475 mp->mnt_stat.f_type = vfsp->vfc_typenum;
476 mp->mnt_gen++;
477 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
478 mp->mnt_vnodecovered = vp;
479 mp->mnt_cred = crdup(cred);
480 mp->mnt_stat.f_owner = cred->cr_uid;
481 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
482 mp->mnt_iosize_max = DFLTPHYS;
483 #ifdef MAC
484 mac_mount_init(mp);
485 mac_mount_create(cred, mp);
486 #endif
487 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
488 TAILQ_INIT(&mp->mnt_uppers);
489 return (mp);
490 }
491
492 /*
493 * Destroy the mount struct previously allocated by vfs_mount_alloc().
494 */
495 void
496 vfs_mount_destroy(struct mount *mp)
497 {
498
499 MNT_ILOCK(mp);
500 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
501 if (mp->mnt_kern_flag & MNTK_MWAIT) {
502 mp->mnt_kern_flag &= ~MNTK_MWAIT;
503 wakeup(mp);
504 }
505 while (mp->mnt_ref)
506 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
507 KASSERT(mp->mnt_ref == 0,
508 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
509 __FILE__, __LINE__));
510 if (mp->mnt_writeopcount != 0)
511 panic("vfs_mount_destroy: nonzero writeopcount");
512 if (mp->mnt_secondary_writes != 0)
513 panic("vfs_mount_destroy: nonzero secondary_writes");
514 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1);
515 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
516 struct vnode *vp;
517
518 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
519 vn_printf(vp, "dangling vnode ");
520 panic("unmount: dangling vnode");
521 }
522 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers"));
523 if (mp->mnt_nvnodelistsize != 0)
524 panic("vfs_mount_destroy: nonzero nvnodelistsize");
525 if (mp->mnt_activevnodelistsize != 0)
526 panic("vfs_mount_destroy: nonzero activevnodelistsize");
527 if (mp->mnt_lockref != 0)
528 panic("vfs_mount_destroy: nonzero lock refcount");
529 MNT_IUNLOCK(mp);
530 if (mp->mnt_vnodecovered != NULL)
531 vrele(mp->mnt_vnodecovered);
532 #ifdef MAC
533 mac_mount_destroy(mp);
534 #endif
535 if (mp->mnt_opt != NULL)
536 vfs_freeopts(mp->mnt_opt);
537 crfree(mp->mnt_cred);
538 uma_zfree(mount_zone, mp);
539 }
540
541 static bool
542 vfs_should_downgrade_to_ro_mount(uint64_t fsflags, int error)
543 {
544 /* This is an upgrade of an exisiting mount. */
545 if ((fsflags & MNT_UPDATE) != 0)
546 return (false);
547 /* This is already an R/O mount. */
548 if ((fsflags & MNT_RDONLY) != 0)
549 return (false);
550
551 switch (error) {
552 case ENODEV: /* generic, geom, ... */
553 case EACCES: /* cam/scsi, ... */
554 case EROFS: /* md, mmcsd, ... */
555 /*
556 * These errors can be returned by the storage layer to signal
557 * that the media is read-only. No harm in the R/O mount
558 * attempt if the error was returned for some other reason.
559 */
560 return (true);
561 default:
562 return (false);
563 }
564 }
565
566 int
567 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
568 {
569 struct vfsoptlist *optlist;
570 struct vfsopt *opt, *tmp_opt;
571 char *fstype, *fspath, *errmsg;
572 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
573 bool autoro;
574
575 errmsg = fspath = NULL;
576 errmsg_len = fspathlen = 0;
577 errmsg_pos = -1;
578 autoro = default_autoro;
579
580 error = vfs_buildopts(fsoptions, &optlist);
581 if (error)
582 return (error);
583
584 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
585 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
586
587 /*
588 * We need these two options before the others,
589 * and they are mandatory for any filesystem.
590 * Ensure they are NUL terminated as well.
591 */
592 fstypelen = 0;
593 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
594 if (error || fstype[fstypelen - 1] != '\0') {
595 error = EINVAL;
596 if (errmsg != NULL)
597 strncpy(errmsg, "Invalid fstype", errmsg_len);
598 goto bail;
599 }
600 fspathlen = 0;
601 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
602 if (error || fspath[fspathlen - 1] != '\0') {
603 error = EINVAL;
604 if (errmsg != NULL)
605 strncpy(errmsg, "Invalid fspath", errmsg_len);
606 goto bail;
607 }
608
609 /*
610 * We need to see if we have the "update" option
611 * before we call vfs_domount(), since vfs_domount() has special
612 * logic based on MNT_UPDATE. This is very important
613 * when we want to update the root filesystem.
614 */
615 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
616 if (strcmp(opt->name, "update") == 0) {
617 fsflags |= MNT_UPDATE;
618 vfs_freeopt(optlist, opt);
619 }
620 else if (strcmp(opt->name, "async") == 0)
621 fsflags |= MNT_ASYNC;
622 else if (strcmp(opt->name, "force") == 0) {
623 fsflags |= MNT_FORCE;
624 vfs_freeopt(optlist, opt);
625 }
626 else if (strcmp(opt->name, "reload") == 0) {
627 fsflags |= MNT_RELOAD;
628 vfs_freeopt(optlist, opt);
629 }
630 else if (strcmp(opt->name, "multilabel") == 0)
631 fsflags |= MNT_MULTILABEL;
632 else if (strcmp(opt->name, "noasync") == 0)
633 fsflags &= ~MNT_ASYNC;
634 else if (strcmp(opt->name, "noatime") == 0)
635 fsflags |= MNT_NOATIME;
636 else if (strcmp(opt->name, "atime") == 0) {
637 free(opt->name, M_MOUNT);
638 opt->name = strdup("nonoatime", M_MOUNT);
639 }
640 else if (strcmp(opt->name, "noclusterr") == 0)
641 fsflags |= MNT_NOCLUSTERR;
642 else if (strcmp(opt->name, "clusterr") == 0) {
643 free(opt->name, M_MOUNT);
644 opt->name = strdup("nonoclusterr", M_MOUNT);
645 }
646 else if (strcmp(opt->name, "noclusterw") == 0)
647 fsflags |= MNT_NOCLUSTERW;
648 else if (strcmp(opt->name, "clusterw") == 0) {
649 free(opt->name, M_MOUNT);
650 opt->name = strdup("nonoclusterw", M_MOUNT);
651 }
652 else if (strcmp(opt->name, "noexec") == 0)
653 fsflags |= MNT_NOEXEC;
654 else if (strcmp(opt->name, "exec") == 0) {
655 free(opt->name, M_MOUNT);
656 opt->name = strdup("nonoexec", M_MOUNT);
657 }
658 else if (strcmp(opt->name, "nosuid") == 0)
659 fsflags |= MNT_NOSUID;
660 else if (strcmp(opt->name, "suid") == 0) {
661 free(opt->name, M_MOUNT);
662 opt->name = strdup("nonosuid", M_MOUNT);
663 }
664 else if (strcmp(opt->name, "nosymfollow") == 0)
665 fsflags |= MNT_NOSYMFOLLOW;
666 else if (strcmp(opt->name, "symfollow") == 0) {
667 free(opt->name, M_MOUNT);
668 opt->name = strdup("nonosymfollow", M_MOUNT);
669 }
670 else if (strcmp(opt->name, "noro") == 0) {
671 fsflags &= ~MNT_RDONLY;
672 autoro = false;
673 }
674 else if (strcmp(opt->name, "rw") == 0) {
675 fsflags &= ~MNT_RDONLY;
676 autoro = false;
677 }
678 else if (strcmp(opt->name, "ro") == 0) {
679 fsflags |= MNT_RDONLY;
680 autoro = false;
681 }
682 else if (strcmp(opt->name, "rdonly") == 0) {
683 free(opt->name, M_MOUNT);
684 opt->name = strdup("ro", M_MOUNT);
685 fsflags |= MNT_RDONLY;
686 autoro = false;
687 }
688 else if (strcmp(opt->name, "autoro") == 0) {
689 vfs_freeopt(optlist, opt);
690 autoro = true;
691 }
692 else if (strcmp(opt->name, "suiddir") == 0)
693 fsflags |= MNT_SUIDDIR;
694 else if (strcmp(opt->name, "sync") == 0)
695 fsflags |= MNT_SYNCHRONOUS;
696 else if (strcmp(opt->name, "union") == 0)
697 fsflags |= MNT_UNION;
698 else if (strcmp(opt->name, "automounted") == 0) {
699 fsflags |= MNT_AUTOMOUNTED;
700 vfs_freeopt(optlist, opt);
701 }
702 }
703
704 /*
705 * Be ultra-paranoid about making sure the type and fspath
706 * variables will fit in our mp buffers, including the
707 * terminating NUL.
708 */
709 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) {
710 error = ENAMETOOLONG;
711 goto bail;
712 }
713
714 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
715
716 /*
717 * See if we can mount in the read-only mode if the error code suggests
718 * that it could be possible and the mount options allow for that.
719 * Never try it if "[no]{ro|rw}" has been explicitly requested and not
720 * overridden by "autoro".
721 */
722 if (autoro && vfs_should_downgrade_to_ro_mount(fsflags, error)) {
723 printf("%s: R/W mount failed, possibly R/O media,"
724 " trying R/O mount\n", __func__);
725 fsflags |= MNT_RDONLY;
726 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
727 }
728 bail:
729 /* copyout the errmsg */
730 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
731 && errmsg_len > 0 && errmsg != NULL) {
732 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
733 bcopy(errmsg,
734 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
735 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
736 } else {
737 copyout(errmsg,
738 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
739 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
740 }
741 }
742
743 if (optlist != NULL)
744 vfs_freeopts(optlist);
745 return (error);
746 }
747
748 /*
749 * Old mount API.
750 */
751 #ifndef _SYS_SYSPROTO_H_
752 struct mount_args {
753 char *type;
754 char *path;
755 int flags;
756 caddr_t data;
757 };
758 #endif
759 /* ARGSUSED */
760 int
761 sys_mount(struct thread *td, struct mount_args *uap)
762 {
763 char *fstype;
764 struct vfsconf *vfsp = NULL;
765 struct mntarg *ma = NULL;
766 uint64_t flags;
767 int error;
768
769 /*
770 * Mount flags are now 64-bits. On 32-bit architectures only
771 * 32-bits are passed in, but from here on everything handles
772 * 64-bit flags correctly.
773 */
774 flags = uap->flags;
775
776 AUDIT_ARG_FFLAGS(flags);
777
778 /*
779 * Filter out MNT_ROOTFS. We do not want clients of mount() in
780 * userspace to set this flag, but we must filter it out if we want
781 * MNT_UPDATE on the root file system to work.
782 * MNT_ROOTFS should only be set by the kernel when mounting its
783 * root file system.
784 */
785 flags &= ~MNT_ROOTFS;
786
787 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
788 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
789 if (error) {
790 free(fstype, M_TEMP);
791 return (error);
792 }
793
794 AUDIT_ARG_TEXT(fstype);
795 vfsp = vfs_byname_kld(fstype, td, &error);
796 free(fstype, M_TEMP);
797 if (vfsp == NULL)
798 return (ENOENT);
799 if (vfsp->vfc_vfsops->vfs_cmount == NULL)
800 return (EOPNOTSUPP);
801
802 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN);
803 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
804 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
805 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
806 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
807
808 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
809 return (error);
810 }
811
812 /*
813 * vfs_domount_first(): first file system mount (not update)
814 */
815 static int
816 vfs_domount_first(
817 struct thread *td, /* Calling thread. */
818 struct vfsconf *vfsp, /* File system type. */
819 char *fspath, /* Mount path. */
820 struct vnode *vp, /* Vnode to be covered. */
821 uint64_t fsflags, /* Flags common to all filesystems. */
822 struct vfsoptlist **optlist /* Options local to the filesystem. */
823 )
824 {
825 struct vattr va;
826 struct mount *mp;
827 struct vnode *newdp;
828 int error;
829
830 ASSERT_VOP_ELOCKED(vp, __func__);
831 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
832
833 /*
834 * If the user is not root, ensure that they own the directory
835 * onto which we are attempting to mount.
836 */
837 error = VOP_GETATTR(vp, &va, td->td_ucred);
838 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
839 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
840 if (error == 0)
841 error = vinvalbuf(vp, V_SAVE, 0, 0);
842 if (error == 0 && vp->v_type != VDIR)
843 error = ENOTDIR;
844 if (error == 0) {
845 VI_LOCK(vp);
846 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
847 vp->v_iflag |= VI_MOUNT;
848 else
849 error = EBUSY;
850 VI_UNLOCK(vp);
851 }
852 if (error != 0) {
853 vput(vp);
854 return (error);
855 }
856 VOP_UNLOCK(vp, 0);
857
858 /* Allocate and initialize the filesystem. */
859 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
860 /* XXXMAC: pass to vfs_mount_alloc? */
861 mp->mnt_optnew = *optlist;
862 /* Set the mount level flags. */
863 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
864
865 /*
866 * Mount the filesystem.
867 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
868 * get. No freeing of cn_pnbuf.
869 */
870 error = VFS_MOUNT(mp);
871 if (error != 0) {
872 vfs_unbusy(mp);
873 mp->mnt_vnodecovered = NULL;
874 vfs_mount_destroy(mp);
875 VI_LOCK(vp);
876 vp->v_iflag &= ~VI_MOUNT;
877 VI_UNLOCK(vp);
878 vrele(vp);
879 return (error);
880 }
881
882 if (mp->mnt_opt != NULL)
883 vfs_freeopts(mp->mnt_opt);
884 mp->mnt_opt = mp->mnt_optnew;
885 *optlist = NULL;
886 (void)VFS_STATFS(mp, &mp->mnt_stat);
887
888 /*
889 * Prevent external consumers of mount options from reading mnt_optnew.
890 */
891 mp->mnt_optnew = NULL;
892
893 MNT_ILOCK(mp);
894 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
895 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
896 mp->mnt_kern_flag |= MNTK_ASYNC;
897 else
898 mp->mnt_kern_flag &= ~MNTK_ASYNC;
899 MNT_IUNLOCK(mp);
900
901 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
902 cache_purge(vp);
903 VI_LOCK(vp);
904 vp->v_iflag &= ~VI_MOUNT;
905 VI_UNLOCK(vp);
906 vp->v_mountedhere = mp;
907 /* Place the new filesystem at the end of the mount list. */
908 mtx_lock(&mountlist_mtx);
909 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
910 mtx_unlock(&mountlist_mtx);
911 vfs_event_signal(NULL, VQ_MOUNT, 0);
912 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
913 panic("mount: lost mount");
914 VOP_UNLOCK(vp, 0);
915 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td);
916 VOP_UNLOCK(newdp, 0);
917 mountcheckdirs(vp, newdp);
918 vrele(newdp);
919 if ((mp->mnt_flag & MNT_RDONLY) == 0)
920 vfs_allocate_syncvnode(mp);
921 vfs_unbusy(mp);
922 return (0);
923 }
924
925 /*
926 * vfs_domount_update(): update of mounted file system
927 */
928 static int
929 vfs_domount_update(
930 struct thread *td, /* Calling thread. */
931 struct vnode *vp, /* Mount point vnode. */
932 uint64_t fsflags, /* Flags common to all filesystems. */
933 struct vfsoptlist **optlist /* Options local to the filesystem. */
934 )
935 {
936 struct export_args export;
937 void *bufp;
938 struct mount *mp;
939 int error, export_error, len;
940 uint64_t flag;
941
942 ASSERT_VOP_ELOCKED(vp, __func__);
943 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
944 mp = vp->v_mount;
945
946 if ((vp->v_vflag & VV_ROOT) == 0) {
947 if (vfs_copyopt(*optlist, "export", &export, sizeof(export))
948 == 0)
949 error = EXDEV;
950 else
951 error = EINVAL;
952 vput(vp);
953 return (error);
954 }
955
956 /*
957 * We only allow the filesystem to be reloaded if it
958 * is currently mounted read-only.
959 */
960 flag = mp->mnt_flag;
961 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
962 vput(vp);
963 return (EOPNOTSUPP); /* Needs translation */
964 }
965 /*
966 * Only privileged root, or (if MNT_USER is set) the user that
967 * did the original mount is permitted to update it.
968 */
969 error = vfs_suser(mp, td);
970 if (error != 0) {
971 vput(vp);
972 return (error);
973 }
974 if (vfs_busy(mp, MBF_NOWAIT)) {
975 vput(vp);
976 return (EBUSY);
977 }
978 VI_LOCK(vp);
979 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
980 VI_UNLOCK(vp);
981 vfs_unbusy(mp);
982 vput(vp);
983 return (EBUSY);
984 }
985 vp->v_iflag |= VI_MOUNT;
986 VI_UNLOCK(vp);
987 VOP_UNLOCK(vp, 0);
988
989 MNT_ILOCK(mp);
990 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
991 MNT_IUNLOCK(mp);
992 error = EBUSY;
993 goto end;
994 }
995 mp->mnt_flag &= ~MNT_UPDATEMASK;
996 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
997 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
998 if ((mp->mnt_flag & MNT_ASYNC) == 0)
999 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1000 MNT_IUNLOCK(mp);
1001 mp->mnt_optnew = *optlist;
1002 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
1003
1004 /*
1005 * Mount the filesystem.
1006 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
1007 * get. No freeing of cn_pnbuf.
1008 */
1009 error = VFS_MOUNT(mp);
1010
1011 export_error = 0;
1012 /* Process the export option. */
1013 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp,
1014 &len) == 0) {
1015 /* Assume that there is only 1 ABI for each length. */
1016 switch (len) {
1017 case (sizeof(struct oexport_args)):
1018 bzero(&export, sizeof(export));
1019 /* FALLTHROUGH */
1020 case (sizeof(export)):
1021 bcopy(bufp, &export, len);
1022 export_error = vfs_export(mp, &export);
1023 break;
1024 default:
1025 export_error = EINVAL;
1026 break;
1027 }
1028 }
1029
1030 MNT_ILOCK(mp);
1031 if (error == 0) {
1032 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
1033 MNT_SNAPSHOT);
1034 } else {
1035 /*
1036 * If we fail, restore old mount flags. MNT_QUOTA is special,
1037 * because it is not part of MNT_UPDATEMASK, but it could have
1038 * changed in the meantime if quotactl(2) was called.
1039 * All in all we want current value of MNT_QUOTA, not the old
1040 * one.
1041 */
1042 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
1043 }
1044 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1045 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1046 mp->mnt_kern_flag |= MNTK_ASYNC;
1047 else
1048 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1049 MNT_IUNLOCK(mp);
1050
1051 if (error != 0)
1052 goto end;
1053
1054 if (mp->mnt_opt != NULL)
1055 vfs_freeopts(mp->mnt_opt);
1056 mp->mnt_opt = mp->mnt_optnew;
1057 *optlist = NULL;
1058 (void)VFS_STATFS(mp, &mp->mnt_stat);
1059 /*
1060 * Prevent external consumers of mount options from reading
1061 * mnt_optnew.
1062 */
1063 mp->mnt_optnew = NULL;
1064
1065 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1066 vfs_allocate_syncvnode(mp);
1067 else
1068 vfs_deallocate_syncvnode(mp);
1069 end:
1070 vfs_unbusy(mp);
1071 VI_LOCK(vp);
1072 vp->v_iflag &= ~VI_MOUNT;
1073 VI_UNLOCK(vp);
1074 vrele(vp);
1075 return (error != 0 ? error : export_error);
1076 }
1077
1078 /*
1079 * vfs_domount(): actually attempt a filesystem mount.
1080 */
1081 static int
1082 vfs_domount(
1083 struct thread *td, /* Calling thread. */
1084 const char *fstype, /* Filesystem type. */
1085 char *fspath, /* Mount path. */
1086 uint64_t fsflags, /* Flags common to all filesystems. */
1087 struct vfsoptlist **optlist /* Options local to the filesystem. */
1088 )
1089 {
1090 struct vfsconf *vfsp;
1091 struct nameidata nd;
1092 struct vnode *vp;
1093 char *pathbuf;
1094 int error;
1095
1096 /*
1097 * Be ultra-paranoid about making sure the type and fspath
1098 * variables will fit in our mp buffers, including the
1099 * terminating NUL.
1100 */
1101 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1102 return (ENAMETOOLONG);
1103
1104 if (jailed(td->td_ucred) || usermount == 0) {
1105 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1106 return (error);
1107 }
1108
1109 /*
1110 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1111 */
1112 if (fsflags & MNT_EXPORTED) {
1113 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1114 if (error)
1115 return (error);
1116 }
1117 if (fsflags & MNT_SUIDDIR) {
1118 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1119 if (error)
1120 return (error);
1121 }
1122 /*
1123 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1124 */
1125 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1126 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1127 fsflags |= MNT_NOSUID | MNT_USER;
1128 }
1129
1130 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1131 vfsp = NULL;
1132 if ((fsflags & MNT_UPDATE) == 0) {
1133 /* Don't try to load KLDs if we're mounting the root. */
1134 if (fsflags & MNT_ROOTFS)
1135 vfsp = vfs_byname(fstype);
1136 else
1137 vfsp = vfs_byname_kld(fstype, td, &error);
1138 if (vfsp == NULL)
1139 return (ENODEV);
1140 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1141 return (EPERM);
1142 }
1143
1144 /*
1145 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1146 */
1147 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1148 UIO_SYSSPACE, fspath, td);
1149 error = namei(&nd);
1150 if (error != 0)
1151 return (error);
1152 NDFREE(&nd, NDF_ONLY_PNBUF);
1153 vp = nd.ni_vp;
1154 if ((fsflags & MNT_UPDATE) == 0) {
1155 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1156 strcpy(pathbuf, fspath);
1157 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1158 /* debug.disablefullpath == 1 results in ENODEV */
1159 if (error == 0 || error == ENODEV) {
1160 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1161 fsflags, optlist);
1162 }
1163 free(pathbuf, M_TEMP);
1164 } else
1165 error = vfs_domount_update(td, vp, fsflags, optlist);
1166
1167 return (error);
1168 }
1169
1170 /*
1171 * Unmount a filesystem.
1172 *
1173 * Note: unmount takes a path to the vnode mounted on as argument, not
1174 * special file (as before).
1175 */
1176 #ifndef _SYS_SYSPROTO_H_
1177 struct unmount_args {
1178 char *path;
1179 int flags;
1180 };
1181 #endif
1182 /* ARGSUSED */
1183 int
1184 sys_unmount(struct thread *td, struct unmount_args *uap)
1185 {
1186 struct nameidata nd;
1187 struct mount *mp;
1188 char *pathbuf;
1189 int error, id0, id1;
1190
1191 AUDIT_ARG_VALUE(uap->flags);
1192 if (jailed(td->td_ucred) || usermount == 0) {
1193 error = priv_check(td, PRIV_VFS_UNMOUNT);
1194 if (error)
1195 return (error);
1196 }
1197
1198 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1199 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1200 if (error) {
1201 free(pathbuf, M_TEMP);
1202 return (error);
1203 }
1204 if (uap->flags & MNT_BYFSID) {
1205 AUDIT_ARG_TEXT(pathbuf);
1206 /* Decode the filesystem ID. */
1207 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1208 free(pathbuf, M_TEMP);
1209 return (EINVAL);
1210 }
1211
1212 mtx_lock(&mountlist_mtx);
1213 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1214 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1215 mp->mnt_stat.f_fsid.val[1] == id1) {
1216 vfs_ref(mp);
1217 break;
1218 }
1219 }
1220 mtx_unlock(&mountlist_mtx);
1221 } else {
1222 /*
1223 * Try to find global path for path argument.
1224 */
1225 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1226 UIO_SYSSPACE, pathbuf, td);
1227 if (namei(&nd) == 0) {
1228 NDFREE(&nd, NDF_ONLY_PNBUF);
1229 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1230 MNAMELEN);
1231 if (error == 0 || error == ENODEV)
1232 vput(nd.ni_vp);
1233 }
1234 mtx_lock(&mountlist_mtx);
1235 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1236 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) {
1237 vfs_ref(mp);
1238 break;
1239 }
1240 }
1241 mtx_unlock(&mountlist_mtx);
1242 }
1243 free(pathbuf, M_TEMP);
1244 if (mp == NULL) {
1245 /*
1246 * Previously we returned ENOENT for a nonexistent path and
1247 * EINVAL for a non-mountpoint. We cannot tell these apart
1248 * now, so in the !MNT_BYFSID case return the more likely
1249 * EINVAL for compatibility.
1250 */
1251 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1252 }
1253
1254 /*
1255 * Don't allow unmounting the root filesystem.
1256 */
1257 if (mp->mnt_flag & MNT_ROOTFS) {
1258 vfs_rel(mp);
1259 return (EINVAL);
1260 }
1261 error = dounmount(mp, uap->flags, td);
1262 return (error);
1263 }
1264
1265 /*
1266 * Return error if any of the vnodes, ignoring the root vnode
1267 * and the syncer vnode, have non-zero usecount.
1268 *
1269 * This function is purely advisory - it can return false positives
1270 * and negatives.
1271 */
1272 static int
1273 vfs_check_usecounts(struct mount *mp)
1274 {
1275 struct vnode *vp, *mvp;
1276
1277 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1278 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON &&
1279 vp->v_usecount != 0) {
1280 VI_UNLOCK(vp);
1281 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1282 return (EBUSY);
1283 }
1284 VI_UNLOCK(vp);
1285 }
1286
1287 return (0);
1288 }
1289
1290 static void
1291 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags)
1292 {
1293
1294 mtx_assert(MNT_MTX(mp), MA_OWNED);
1295 mp->mnt_kern_flag &= ~mntkflags;
1296 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) {
1297 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1298 wakeup(mp);
1299 }
1300 MNT_IUNLOCK(mp);
1301 if (coveredvp != NULL) {
1302 VOP_UNLOCK(coveredvp, 0);
1303 vdrop(coveredvp);
1304 }
1305 vn_finished_write(mp);
1306 }
1307
1308 /*
1309 * Do the actual filesystem unmount.
1310 */
1311 int
1312 dounmount(struct mount *mp, int flags, struct thread *td)
1313 {
1314 struct vnode *coveredvp, *fsrootvp;
1315 int error;
1316 uint64_t async_flag;
1317 int mnt_gen_r;
1318
1319 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1320 mnt_gen_r = mp->mnt_gen;
1321 VI_LOCK(coveredvp);
1322 vholdl(coveredvp);
1323 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1324 /*
1325 * Check for mp being unmounted while waiting for the
1326 * covered vnode lock.
1327 */
1328 if (coveredvp->v_mountedhere != mp ||
1329 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1330 VOP_UNLOCK(coveredvp, 0);
1331 vdrop(coveredvp);
1332 vfs_rel(mp);
1333 return (EBUSY);
1334 }
1335 }
1336
1337 /*
1338 * Only privileged root, or (if MNT_USER is set) the user that did the
1339 * original mount is permitted to unmount this filesystem.
1340 */
1341 error = vfs_suser(mp, td);
1342 if (error != 0) {
1343 if (coveredvp != NULL) {
1344 VOP_UNLOCK(coveredvp, 0);
1345 vdrop(coveredvp);
1346 }
1347 vfs_rel(mp);
1348 return (error);
1349 }
1350
1351 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF);
1352 MNT_ILOCK(mp);
1353 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 ||
1354 (mp->mnt_flag & MNT_UPDATE) != 0 ||
1355 !TAILQ_EMPTY(&mp->mnt_uppers)) {
1356 dounmount_cleanup(mp, coveredvp, 0);
1357 return (EBUSY);
1358 }
1359 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1360 if (flags & MNT_NONBUSY) {
1361 MNT_IUNLOCK(mp);
1362 error = vfs_check_usecounts(mp);
1363 MNT_ILOCK(mp);
1364 if (error != 0) {
1365 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT |
1366 MNTK_NOINSMNTQ);
1367 return (error);
1368 }
1369 }
1370 /* Allow filesystems to detect that a forced unmount is in progress. */
1371 if (flags & MNT_FORCE) {
1372 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1373 MNT_IUNLOCK(mp);
1374 /*
1375 * Must be done after setting MNTK_UNMOUNTF and before
1376 * waiting for mnt_lockref to become 0.
1377 */
1378 VFS_PURGE(mp);
1379 MNT_ILOCK(mp);
1380 }
1381 error = 0;
1382 if (mp->mnt_lockref) {
1383 mp->mnt_kern_flag |= MNTK_DRAINING;
1384 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1385 "mount drain", 0);
1386 }
1387 MNT_IUNLOCK(mp);
1388 KASSERT(mp->mnt_lockref == 0,
1389 ("%s: invalid lock refcount in the drain path @ %s:%d",
1390 __func__, __FILE__, __LINE__));
1391 KASSERT(error == 0,
1392 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1393 __func__, __FILE__, __LINE__));
1394
1395 if (mp->mnt_flag & MNT_EXPUBLIC)
1396 vfs_setpublicfs(NULL, NULL, NULL);
1397
1398 /*
1399 * From now, we can claim that the use reference on the
1400 * coveredvp is ours, and the ref can be released only by
1401 * successfull unmount by us, or left for later unmount
1402 * attempt. The previously acquired hold reference is no
1403 * longer needed to protect the vnode from reuse.
1404 */
1405 if (coveredvp != NULL)
1406 vdrop(coveredvp);
1407
1408 vfs_msync(mp, MNT_WAIT);
1409 MNT_ILOCK(mp);
1410 async_flag = mp->mnt_flag & MNT_ASYNC;
1411 mp->mnt_flag &= ~MNT_ASYNC;
1412 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1413 MNT_IUNLOCK(mp);
1414 cache_purgevfs(mp, false); /* remove cache entries for this file sys */
1415 vfs_deallocate_syncvnode(mp);
1416 /*
1417 * For forced unmounts, move process cdir/rdir refs on the fs root
1418 * vnode to the covered vnode. For non-forced unmounts we want
1419 * such references to cause an EBUSY error.
1420 */
1421 if ((flags & MNT_FORCE) &&
1422 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1423 if (mp->mnt_vnodecovered != NULL &&
1424 (mp->mnt_flag & MNT_IGNORE) == 0)
1425 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1426 if (fsrootvp == rootvnode) {
1427 vrele(rootvnode);
1428 rootvnode = NULL;
1429 }
1430 vput(fsrootvp);
1431 }
1432 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 ||
1433 (error = VFS_SYNC(mp, MNT_WAIT)) == 0)
1434 error = VFS_UNMOUNT(mp, flags);
1435 vn_finished_write(mp);
1436 /*
1437 * If we failed to flush the dirty blocks for this mount point,
1438 * undo all the cdir/rdir and rootvnode changes we made above.
1439 * Unless we failed to do so because the device is reporting that
1440 * it doesn't exist anymore.
1441 */
1442 if (error && error != ENXIO) {
1443 if ((flags & MNT_FORCE) &&
1444 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1445 if (mp->mnt_vnodecovered != NULL &&
1446 (mp->mnt_flag & MNT_IGNORE) == 0)
1447 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1448 if (rootvnode == NULL) {
1449 rootvnode = fsrootvp;
1450 vref(rootvnode);
1451 }
1452 vput(fsrootvp);
1453 }
1454 MNT_ILOCK(mp);
1455 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1456 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1457 MNT_IUNLOCK(mp);
1458 vfs_allocate_syncvnode(mp);
1459 MNT_ILOCK(mp);
1460 }
1461 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1462 mp->mnt_flag |= async_flag;
1463 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1464 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1465 mp->mnt_kern_flag |= MNTK_ASYNC;
1466 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1467 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1468 wakeup(mp);
1469 }
1470 MNT_IUNLOCK(mp);
1471 if (coveredvp)
1472 VOP_UNLOCK(coveredvp, 0);
1473 return (error);
1474 }
1475 mtx_lock(&mountlist_mtx);
1476 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1477 mtx_unlock(&mountlist_mtx);
1478 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td);
1479 if (coveredvp != NULL) {
1480 coveredvp->v_mountedhere = NULL;
1481 VOP_UNLOCK(coveredvp, 0);
1482 }
1483 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1484 if (mp == rootdevmp)
1485 rootdevmp = NULL;
1486 vfs_mount_destroy(mp);
1487 return (0);
1488 }
1489
1490 /*
1491 * Report errors during filesystem mounting.
1492 */
1493 void
1494 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1495 {
1496 struct vfsoptlist *moptlist = mp->mnt_optnew;
1497 va_list ap;
1498 int error, len;
1499 char *errmsg;
1500
1501 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1502 if (error || errmsg == NULL || len <= 0)
1503 return;
1504
1505 va_start(ap, fmt);
1506 vsnprintf(errmsg, (size_t)len, fmt, ap);
1507 va_end(ap);
1508 }
1509
1510 void
1511 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1512 {
1513 va_list ap;
1514 int error, len;
1515 char *errmsg;
1516
1517 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1518 if (error || errmsg == NULL || len <= 0)
1519 return;
1520
1521 va_start(ap, fmt);
1522 vsnprintf(errmsg, (size_t)len, fmt, ap);
1523 va_end(ap);
1524 }
1525
1526 /*
1527 * ---------------------------------------------------------------------
1528 * Functions for querying mount options/arguments from filesystems.
1529 */
1530
1531 /*
1532 * Check that no unknown options are given
1533 */
1534 int
1535 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1536 {
1537 struct vfsopt *opt;
1538 char errmsg[255];
1539 const char **t, *p, *q;
1540 int ret = 0;
1541
1542 TAILQ_FOREACH(opt, opts, link) {
1543 p = opt->name;
1544 q = NULL;
1545 if (p[0] == 'n' && p[1] == 'o')
1546 q = p + 2;
1547 for(t = global_opts; *t != NULL; t++) {
1548 if (strcmp(*t, p) == 0)
1549 break;
1550 if (q != NULL) {
1551 if (strcmp(*t, q) == 0)
1552 break;
1553 }
1554 }
1555 if (*t != NULL)
1556 continue;
1557 for(t = legal; *t != NULL; t++) {
1558 if (strcmp(*t, p) == 0)
1559 break;
1560 if (q != NULL) {
1561 if (strcmp(*t, q) == 0)
1562 break;
1563 }
1564 }
1565 if (*t != NULL)
1566 continue;
1567 snprintf(errmsg, sizeof(errmsg),
1568 "mount option <%s> is unknown", p);
1569 ret = EINVAL;
1570 }
1571 if (ret != 0) {
1572 TAILQ_FOREACH(opt, opts, link) {
1573 if (strcmp(opt->name, "errmsg") == 0) {
1574 strncpy((char *)opt->value, errmsg, opt->len);
1575 break;
1576 }
1577 }
1578 if (opt == NULL)
1579 printf("%s\n", errmsg);
1580 }
1581 return (ret);
1582 }
1583
1584 /*
1585 * Get a mount option by its name.
1586 *
1587 * Return 0 if the option was found, ENOENT otherwise.
1588 * If len is non-NULL it will be filled with the length
1589 * of the option. If buf is non-NULL, it will be filled
1590 * with the address of the option.
1591 */
1592 int
1593 vfs_getopt(struct vfsoptlist *opts, const char *name, void **buf, int *len)
1594 {
1595 struct vfsopt *opt;
1596
1597 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1598
1599 TAILQ_FOREACH(opt, opts, link) {
1600 if (strcmp(name, opt->name) == 0) {
1601 opt->seen = 1;
1602 if (len != NULL)
1603 *len = opt->len;
1604 if (buf != NULL)
1605 *buf = opt->value;
1606 return (0);
1607 }
1608 }
1609 return (ENOENT);
1610 }
1611
1612 int
1613 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1614 {
1615 struct vfsopt *opt;
1616
1617 if (opts == NULL)
1618 return (-1);
1619
1620 TAILQ_FOREACH(opt, opts, link) {
1621 if (strcmp(name, opt->name) == 0) {
1622 opt->seen = 1;
1623 return (opt->pos);
1624 }
1625 }
1626 return (-1);
1627 }
1628
1629 int
1630 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1631 {
1632 char *opt_value, *vtp;
1633 quad_t iv;
1634 int error, opt_len;
1635
1636 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1637 if (error != 0)
1638 return (error);
1639 if (opt_len == 0 || opt_value == NULL)
1640 return (EINVAL);
1641 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1642 return (EINVAL);
1643 iv = strtoq(opt_value, &vtp, 0);
1644 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1645 return (EINVAL);
1646 if (iv < 0)
1647 return (EINVAL);
1648 switch (vtp[0]) {
1649 case 't':
1650 case 'T':
1651 iv *= 1024;
1652 case 'g':
1653 case 'G':
1654 iv *= 1024;
1655 case 'm':
1656 case 'M':
1657 iv *= 1024;
1658 case 'k':
1659 case 'K':
1660 iv *= 1024;
1661 case '\0':
1662 break;
1663 default:
1664 return (EINVAL);
1665 }
1666 *value = iv;
1667
1668 return (0);
1669 }
1670
1671 char *
1672 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1673 {
1674 struct vfsopt *opt;
1675
1676 *error = 0;
1677 TAILQ_FOREACH(opt, opts, link) {
1678 if (strcmp(name, opt->name) != 0)
1679 continue;
1680 opt->seen = 1;
1681 if (opt->len == 0 ||
1682 ((char *)opt->value)[opt->len - 1] != '\0') {
1683 *error = EINVAL;
1684 return (NULL);
1685 }
1686 return (opt->value);
1687 }
1688 *error = ENOENT;
1689 return (NULL);
1690 }
1691
1692 int
1693 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1694 uint64_t val)
1695 {
1696 struct vfsopt *opt;
1697
1698 TAILQ_FOREACH(opt, opts, link) {
1699 if (strcmp(name, opt->name) == 0) {
1700 opt->seen = 1;
1701 if (w != NULL)
1702 *w |= val;
1703 return (1);
1704 }
1705 }
1706 if (w != NULL)
1707 *w &= ~val;
1708 return (0);
1709 }
1710
1711 int
1712 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1713 {
1714 va_list ap;
1715 struct vfsopt *opt;
1716 int ret;
1717
1718 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1719
1720 TAILQ_FOREACH(opt, opts, link) {
1721 if (strcmp(name, opt->name) != 0)
1722 continue;
1723 opt->seen = 1;
1724 if (opt->len == 0 || opt->value == NULL)
1725 return (0);
1726 if (((char *)opt->value)[opt->len - 1] != '\0')
1727 return (0);
1728 va_start(ap, fmt);
1729 ret = vsscanf(opt->value, fmt, ap);
1730 va_end(ap);
1731 return (ret);
1732 }
1733 return (0);
1734 }
1735
1736 int
1737 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1738 {
1739 struct vfsopt *opt;
1740
1741 TAILQ_FOREACH(opt, opts, link) {
1742 if (strcmp(name, opt->name) != 0)
1743 continue;
1744 opt->seen = 1;
1745 if (opt->value == NULL)
1746 opt->len = len;
1747 else {
1748 if (opt->len != len)
1749 return (EINVAL);
1750 bcopy(value, opt->value, len);
1751 }
1752 return (0);
1753 }
1754 return (ENOENT);
1755 }
1756
1757 int
1758 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1759 {
1760 struct vfsopt *opt;
1761
1762 TAILQ_FOREACH(opt, opts, link) {
1763 if (strcmp(name, opt->name) != 0)
1764 continue;
1765 opt->seen = 1;
1766 if (opt->value == NULL)
1767 opt->len = len;
1768 else {
1769 if (opt->len < len)
1770 return (EINVAL);
1771 opt->len = len;
1772 bcopy(value, opt->value, len);
1773 }
1774 return (0);
1775 }
1776 return (ENOENT);
1777 }
1778
1779 int
1780 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1781 {
1782 struct vfsopt *opt;
1783
1784 TAILQ_FOREACH(opt, opts, link) {
1785 if (strcmp(name, opt->name) != 0)
1786 continue;
1787 opt->seen = 1;
1788 if (opt->value == NULL)
1789 opt->len = strlen(value) + 1;
1790 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1791 return (EINVAL);
1792 return (0);
1793 }
1794 return (ENOENT);
1795 }
1796
1797 /*
1798 * Find and copy a mount option.
1799 *
1800 * The size of the buffer has to be specified
1801 * in len, if it is not the same length as the
1802 * mount option, EINVAL is returned.
1803 * Returns ENOENT if the option is not found.
1804 */
1805 int
1806 vfs_copyopt(struct vfsoptlist *opts, const char *name, void *dest, int len)
1807 {
1808 struct vfsopt *opt;
1809
1810 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1811
1812 TAILQ_FOREACH(opt, opts, link) {
1813 if (strcmp(name, opt->name) == 0) {
1814 opt->seen = 1;
1815 if (len != opt->len)
1816 return (EINVAL);
1817 bcopy(opt->value, dest, opt->len);
1818 return (0);
1819 }
1820 }
1821 return (ENOENT);
1822 }
1823
1824 int
1825 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1826 {
1827 int error;
1828
1829 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1830 if (sbp != &mp->mnt_stat)
1831 *sbp = mp->mnt_stat;
1832 return (error);
1833 }
1834
1835 void
1836 vfs_mountedfrom(struct mount *mp, const char *from)
1837 {
1838
1839 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1840 strlcpy(mp->mnt_stat.f_mntfromname, from,
1841 sizeof mp->mnt_stat.f_mntfromname);
1842 }
1843
1844 /*
1845 * ---------------------------------------------------------------------
1846 * This is the api for building mount args and mounting filesystems from
1847 * inside the kernel.
1848 *
1849 * The API works by accumulation of individual args. First error is
1850 * latched.
1851 *
1852 * XXX: should be documented in new manpage kernel_mount(9)
1853 */
1854
1855 /* A memory allocation which must be freed when we are done */
1856 struct mntaarg {
1857 SLIST_ENTRY(mntaarg) next;
1858 };
1859
1860 /* The header for the mount arguments */
1861 struct mntarg {
1862 struct iovec *v;
1863 int len;
1864 int error;
1865 SLIST_HEAD(, mntaarg) list;
1866 };
1867
1868 /*
1869 * Add a boolean argument.
1870 *
1871 * flag is the boolean value.
1872 * name must start with "no".
1873 */
1874 struct mntarg *
1875 mount_argb(struct mntarg *ma, int flag, const char *name)
1876 {
1877
1878 KASSERT(name[0] == 'n' && name[1] == 'o',
1879 ("mount_argb(...,%s): name must start with 'no'", name));
1880
1881 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1882 }
1883
1884 /*
1885 * Add an argument printf style
1886 */
1887 struct mntarg *
1888 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1889 {
1890 va_list ap;
1891 struct mntaarg *maa;
1892 struct sbuf *sb;
1893 int len;
1894
1895 if (ma == NULL) {
1896 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1897 SLIST_INIT(&ma->list);
1898 }
1899 if (ma->error)
1900 return (ma);
1901
1902 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1903 M_MOUNT, M_WAITOK);
1904 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1905 ma->v[ma->len].iov_len = strlen(name) + 1;
1906 ma->len++;
1907
1908 sb = sbuf_new_auto();
1909 va_start(ap, fmt);
1910 sbuf_vprintf(sb, fmt, ap);
1911 va_end(ap);
1912 sbuf_finish(sb);
1913 len = sbuf_len(sb) + 1;
1914 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1915 SLIST_INSERT_HEAD(&ma->list, maa, next);
1916 bcopy(sbuf_data(sb), maa + 1, len);
1917 sbuf_delete(sb);
1918
1919 ma->v[ma->len].iov_base = maa + 1;
1920 ma->v[ma->len].iov_len = len;
1921 ma->len++;
1922
1923 return (ma);
1924 }
1925
1926 /*
1927 * Add an argument which is a userland string.
1928 */
1929 struct mntarg *
1930 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1931 {
1932 struct mntaarg *maa;
1933 char *tbuf;
1934
1935 if (val == NULL)
1936 return (ma);
1937 if (ma == NULL) {
1938 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1939 SLIST_INIT(&ma->list);
1940 }
1941 if (ma->error)
1942 return (ma);
1943 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1944 SLIST_INSERT_HEAD(&ma->list, maa, next);
1945 tbuf = (void *)(maa + 1);
1946 ma->error = copyinstr(val, tbuf, len, NULL);
1947 return (mount_arg(ma, name, tbuf, -1));
1948 }
1949
1950 /*
1951 * Plain argument.
1952 *
1953 * If length is -1, treat value as a C string.
1954 */
1955 struct mntarg *
1956 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1957 {
1958
1959 if (ma == NULL) {
1960 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1961 SLIST_INIT(&ma->list);
1962 }
1963 if (ma->error)
1964 return (ma);
1965
1966 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1967 M_MOUNT, M_WAITOK);
1968 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1969 ma->v[ma->len].iov_len = strlen(name) + 1;
1970 ma->len++;
1971
1972 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1973 if (len < 0)
1974 ma->v[ma->len].iov_len = strlen(val) + 1;
1975 else
1976 ma->v[ma->len].iov_len = len;
1977 ma->len++;
1978 return (ma);
1979 }
1980
1981 /*
1982 * Free a mntarg structure
1983 */
1984 static void
1985 free_mntarg(struct mntarg *ma)
1986 {
1987 struct mntaarg *maa;
1988
1989 while (!SLIST_EMPTY(&ma->list)) {
1990 maa = SLIST_FIRST(&ma->list);
1991 SLIST_REMOVE_HEAD(&ma->list, next);
1992 free(maa, M_MOUNT);
1993 }
1994 free(ma->v, M_MOUNT);
1995 free(ma, M_MOUNT);
1996 }
1997
1998 /*
1999 * Mount a filesystem
2000 */
2001 int
2002 kernel_mount(struct mntarg *ma, uint64_t flags)
2003 {
2004 struct uio auio;
2005 int error;
2006
2007 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
2008 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
2009 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
2010
2011 auio.uio_iov = ma->v;
2012 auio.uio_iovcnt = ma->len;
2013 auio.uio_segflg = UIO_SYSSPACE;
2014
2015 error = ma->error;
2016 if (!error)
2017 error = vfs_donmount(curthread, flags, &auio);
2018 free_mntarg(ma);
2019 return (error);
2020 }
2021
2022 /*
2023 * A printflike function to mount a filesystem.
2024 */
2025 int
2026 kernel_vmount(int flags, ...)
2027 {
2028 struct mntarg *ma = NULL;
2029 va_list ap;
2030 const char *cp;
2031 const void *vp;
2032 int error;
2033
2034 va_start(ap, flags);
2035 for (;;) {
2036 cp = va_arg(ap, const char *);
2037 if (cp == NULL)
2038 break;
2039 vp = va_arg(ap, const void *);
2040 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
2041 }
2042 va_end(ap);
2043
2044 error = kernel_mount(ma, flags);
2045 return (error);
2046 }
2047
2048 void
2049 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
2050 {
2051
2052 bcopy(oexp, exp, sizeof(*oexp));
2053 exp->ex_numsecflavors = 0;
2054 }
Cache object: bf62ce41199ac9edd2e1d9de9bce7b1f
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