2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1999-2004 Poul-Henning Kamp
5 * Copyright (c) 1999 Michael Smith
6 * Copyright (c) 1989, 1993
7 * The Regents of the University of California. All rights reserved.
8 * (c) UNIX System Laboratories, Inc.
9 * All or some portions of this file are derived from material licensed
10 * to the University of California by American Telephone and Telegraph
11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
12 * the permission of UNIX System Laboratories, Inc.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
44 #include <sys/fcntl.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>
54 #include <sys/filedesc.h>
55 #include <sys/reboot.h>
57 #include <sys/syscallsubr.h>
58 #include <sys/sysproto.h>
60 #include <sys/sysctl.h>
61 #include <sys/sysent.h>
62 #include <sys/systm.h>
63 #include <sys/vnode.h>
66 #include <geom/geom.h>
68 #include <machine/stdarg.h>
70 #include <security/audit/audit.h>
71 #include <security/mac/mac_framework.h>
73 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
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);
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");
83 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
84 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure");
85 static uma_zone_t mount_zone;
87 /* List of mounted filesystems. */
88 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
90 /* For any iteration/modification of mountlist */
91 struct mtx mountlist_mtx;
92 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
95 * Global opts, taken by all filesystems
97 static const char *global_opts[] = {
109 mount_init(void *mem, int size, int flags)
113 mp = (struct mount *)mem;
114 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
115 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF);
116 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
121 mount_fini(void *mem, int size)
125 mp = (struct mount *)mem;
126 lockdestroy(&mp->mnt_explock);
127 mtx_destroy(&mp->mnt_listmtx);
128 mtx_destroy(&mp->mnt_mtx);
132 vfs_mount_init(void *dummy __unused)
135 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
136 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
138 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
141 * ---------------------------------------------------------------------
142 * Functions for building and sanitizing the mount options
145 /* Remove one mount option. */
147 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
150 TAILQ_REMOVE(opts, opt, link);
151 free(opt->name, M_MOUNT);
152 if (opt->value != NULL)
153 free(opt->value, M_MOUNT);
157 /* Release all resources related to the mount options. */
159 vfs_freeopts(struct vfsoptlist *opts)
163 while (!TAILQ_EMPTY(opts)) {
164 opt = TAILQ_FIRST(opts);
165 vfs_freeopt(opts, opt);
171 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
173 struct vfsopt *opt, *temp;
177 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
178 if (strcmp(opt->name, name) == 0)
179 vfs_freeopt(opts, opt);
184 vfs_isopt_ro(const char *opt)
187 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
188 strcmp(opt, "norw") == 0)
194 vfs_isopt_rw(const char *opt)
197 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
203 * Check if options are equal (with or without the "no" prefix).
206 vfs_equalopts(const char *opt1, const char *opt2)
210 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
211 if (strcmp(opt1, opt2) == 0)
213 /* "noopt" vs. "opt" */
214 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
216 /* "opt" vs. "noopt" */
217 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
219 while ((p = strchr(opt1, '.')) != NULL &&
220 !strncmp(opt1, opt2, ++p - opt1)) {
223 /* "foo.noopt" vs. "foo.opt" */
224 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
226 /* "foo.opt" vs. "foo.noopt" */
227 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
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)))
238 * If a mount option is specified several times,
239 * (with or without the "no" prefix) only keep
240 * the last occurrence of it.
243 vfs_sanitizeopts(struct vfsoptlist *opts)
245 struct vfsopt *opt, *opt2, *tmp;
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);
255 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
262 * Build a linked list of mount options from a struct uio.
265 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
267 struct vfsoptlist *opts;
269 size_t memused, namelen, optlen;
270 unsigned int i, iovcnt;
273 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
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;
282 * Avoid consuming too much memory, and attempts to overflow
285 if (memused > VFS_MOUNTARG_SIZE_MAX ||
286 optlen > VFS_MOUNTARG_SIZE_MAX ||
287 namelen > VFS_MOUNTARG_SIZE_MAX) {
292 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
293 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
300 * Do this early, so jumps to "bad" will free the current
303 TAILQ_INSERT_TAIL(opts, opt, link);
305 if (auio->uio_segflg == UIO_SYSSPACE) {
306 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
308 error = copyin(auio->uio_iov[i].iov_base, opt->name,
313 /* Ensure names are null-terminated strings. */
314 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
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,
325 error = copyin(auio->uio_iov[i + 1].iov_base,
332 vfs_sanitizeopts(opts);
341 * Merge the old mount options with the new ones passed
342 * in the MNT_UPDATE case.
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.
349 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
351 struct vfsopt *opt, *new;
353 TAILQ_FOREACH(opt, oldopts, link) {
354 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
355 new->name = strdup(opt->name, M_MOUNT);
357 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
358 bcopy(opt->value, new->value, opt->len);
362 new->seen = opt->seen;
363 TAILQ_INSERT_HEAD(toopts, new, link);
365 vfs_sanitizeopts(toopts);
369 * Mount a filesystem.
371 #ifndef _SYS_SYSPROTO_H_
379 sys_nmount(struct thread *td, struct nmount_args *uap)
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.
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);
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
404 flags &= ~MNT_ROOTFS;
406 iovcnt = uap->iovcnt;
408 * Check that we have an even number of iovec's
409 * and that we have at least two options.
411 if ((iovcnt & 1) || (iovcnt < 4)) {
412 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
417 error = copyinuio(uap->iovp, iovcnt, &auio);
419 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
423 error = vfs_donmount(td, flags, auio);
430 * ---------------------------------------------------------------------
431 * Various utility functions
435 vfs_ref(struct mount *mp)
438 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
445 vfs_rel(struct mount *mp)
448 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
455 * Allocate and initialize the mount point struct.
458 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
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 TAILQ_INIT(&mp->mnt_tmpfreevnodelist);
471 mp->mnt_tmpfreevnodelistsize = 0;
473 (void) vfs_busy(mp, MBF_NOWAIT);
474 atomic_add_acq_int(&vfsp->vfc_refcount, 1);
475 mp->mnt_op = vfsp->vfc_vfsops;
477 mp->mnt_stat.f_type = vfsp->vfc_typenum;
479 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
480 mp->mnt_vnodecovered = vp;
481 mp->mnt_cred = crdup(cred);
482 mp->mnt_stat.f_owner = cred->cr_uid;
483 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
484 mp->mnt_iosize_max = DFLTPHYS;
487 mac_mount_create(cred, mp);
489 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
490 TAILQ_INIT(&mp->mnt_uppers);
495 * Destroy the mount struct previously allocated by vfs_mount_alloc().
498 vfs_mount_destroy(struct mount *mp)
502 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
503 if (mp->mnt_kern_flag & MNTK_MWAIT) {
504 mp->mnt_kern_flag &= ~MNTK_MWAIT;
508 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
509 KASSERT(mp->mnt_ref == 0,
510 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
511 __FILE__, __LINE__));
512 if (mp->mnt_writeopcount != 0)
513 panic("vfs_mount_destroy: nonzero writeopcount");
514 if (mp->mnt_secondary_writes != 0)
515 panic("vfs_mount_destroy: nonzero secondary_writes");
516 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1);
517 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
520 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
521 vn_printf(vp, "dangling vnode ");
522 panic("unmount: dangling vnode");
524 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers"));
525 if (mp->mnt_nvnodelistsize != 0)
526 panic("vfs_mount_destroy: nonzero nvnodelistsize");
527 if (mp->mnt_activevnodelistsize != 0)
528 panic("vfs_mount_destroy: nonzero activevnodelistsize");
529 if (mp->mnt_tmpfreevnodelistsize != 0)
530 panic("vfs_mount_destroy: nonzero tmpfreevnodelistsize");
531 if (mp->mnt_lockref != 0)
532 panic("vfs_mount_destroy: nonzero lock refcount");
534 if (mp->mnt_vnodecovered != NULL)
535 vrele(mp->mnt_vnodecovered);
537 mac_mount_destroy(mp);
539 if (mp->mnt_opt != NULL)
540 vfs_freeopts(mp->mnt_opt);
541 crfree(mp->mnt_cred);
542 uma_zfree(mount_zone, mp);
546 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
548 struct vfsoptlist *optlist;
549 struct vfsopt *opt, *tmp_opt;
550 char *fstype, *fspath, *errmsg;
551 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
553 errmsg = fspath = NULL;
554 errmsg_len = fspathlen = 0;
557 error = vfs_buildopts(fsoptions, &optlist);
561 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
562 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
565 * We need these two options before the others,
566 * and they are mandatory for any filesystem.
567 * Ensure they are NUL terminated as well.
570 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
571 if (error || fstype[fstypelen - 1] != '\0') {
574 strncpy(errmsg, "Invalid fstype", errmsg_len);
578 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
579 if (error || fspath[fspathlen - 1] != '\0') {
582 strncpy(errmsg, "Invalid fspath", errmsg_len);
587 * We need to see if we have the "update" option
588 * before we call vfs_domount(), since vfs_domount() has special
589 * logic based on MNT_UPDATE. This is very important
590 * when we want to update the root filesystem.
592 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
593 if (strcmp(opt->name, "update") == 0) {
594 fsflags |= MNT_UPDATE;
595 vfs_freeopt(optlist, opt);
597 else if (strcmp(opt->name, "async") == 0)
598 fsflags |= MNT_ASYNC;
599 else if (strcmp(opt->name, "force") == 0) {
600 fsflags |= MNT_FORCE;
601 vfs_freeopt(optlist, opt);
603 else if (strcmp(opt->name, "reload") == 0) {
604 fsflags |= MNT_RELOAD;
605 vfs_freeopt(optlist, opt);
607 else if (strcmp(opt->name, "multilabel") == 0)
608 fsflags |= MNT_MULTILABEL;
609 else if (strcmp(opt->name, "noasync") == 0)
610 fsflags &= ~MNT_ASYNC;
611 else if (strcmp(opt->name, "noatime") == 0)
612 fsflags |= MNT_NOATIME;
613 else if (strcmp(opt->name, "atime") == 0) {
614 free(opt->name, M_MOUNT);
615 opt->name = strdup("nonoatime", M_MOUNT);
617 else if (strcmp(opt->name, "noclusterr") == 0)
618 fsflags |= MNT_NOCLUSTERR;
619 else if (strcmp(opt->name, "clusterr") == 0) {
620 free(opt->name, M_MOUNT);
621 opt->name = strdup("nonoclusterr", M_MOUNT);
623 else if (strcmp(opt->name, "noclusterw") == 0)
624 fsflags |= MNT_NOCLUSTERW;
625 else if (strcmp(opt->name, "clusterw") == 0) {
626 free(opt->name, M_MOUNT);
627 opt->name = strdup("nonoclusterw", M_MOUNT);
629 else if (strcmp(opt->name, "noexec") == 0)
630 fsflags |= MNT_NOEXEC;
631 else if (strcmp(opt->name, "exec") == 0) {
632 free(opt->name, M_MOUNT);
633 opt->name = strdup("nonoexec", M_MOUNT);
635 else if (strcmp(opt->name, "nosuid") == 0)
636 fsflags |= MNT_NOSUID;
637 else if (strcmp(opt->name, "suid") == 0) {
638 free(opt->name, M_MOUNT);
639 opt->name = strdup("nonosuid", M_MOUNT);
641 else if (strcmp(opt->name, "nosymfollow") == 0)
642 fsflags |= MNT_NOSYMFOLLOW;
643 else if (strcmp(opt->name, "symfollow") == 0) {
644 free(opt->name, M_MOUNT);
645 opt->name = strdup("nonosymfollow", M_MOUNT);
647 else if (strcmp(opt->name, "noro") == 0)
648 fsflags &= ~MNT_RDONLY;
649 else if (strcmp(opt->name, "rw") == 0)
650 fsflags &= ~MNT_RDONLY;
651 else if (strcmp(opt->name, "ro") == 0)
652 fsflags |= MNT_RDONLY;
653 else if (strcmp(opt->name, "rdonly") == 0) {
654 free(opt->name, M_MOUNT);
655 opt->name = strdup("ro", M_MOUNT);
656 fsflags |= MNT_RDONLY;
658 else if (strcmp(opt->name, "suiddir") == 0)
659 fsflags |= MNT_SUIDDIR;
660 else if (strcmp(opt->name, "sync") == 0)
661 fsflags |= MNT_SYNCHRONOUS;
662 else if (strcmp(opt->name, "union") == 0)
663 fsflags |= MNT_UNION;
664 else if (strcmp(opt->name, "automounted") == 0) {
665 fsflags |= MNT_AUTOMOUNTED;
666 vfs_freeopt(optlist, opt);
671 * Be ultra-paranoid about making sure the type and fspath
672 * variables will fit in our mp buffers, including the
675 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) {
676 error = ENAMETOOLONG;
680 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
682 /* copyout the errmsg */
683 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
684 && errmsg_len > 0 && errmsg != NULL) {
685 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
687 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
688 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
691 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
692 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
697 vfs_freeopts(optlist);
704 #ifndef _SYS_SYSPROTO_H_
714 sys_mount(struct thread *td, struct mount_args *uap)
717 struct vfsconf *vfsp = NULL;
718 struct mntarg *ma = NULL;
723 * Mount flags are now 64-bits. On 32-bit architectures only
724 * 32-bits are passed in, but from here on everything handles
725 * 64-bit flags correctly.
729 AUDIT_ARG_FFLAGS(flags);
732 * Filter out MNT_ROOTFS. We do not want clients of mount() in
733 * userspace to set this flag, but we must filter it out if we want
734 * MNT_UPDATE on the root file system to work.
735 * MNT_ROOTFS should only be set by the kernel when mounting its
738 flags &= ~MNT_ROOTFS;
740 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
741 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
743 free(fstype, M_TEMP);
747 AUDIT_ARG_TEXT(fstype);
748 vfsp = vfs_byname_kld(fstype, td, &error);
749 free(fstype, M_TEMP);
752 if (vfsp->vfc_vfsops->vfs_cmount == NULL)
755 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN);
756 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
757 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
758 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
759 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
761 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
766 * vfs_domount_first(): first file system mount (not update)
770 struct thread *td, /* Calling thread. */
771 struct vfsconf *vfsp, /* File system type. */
772 char *fspath, /* Mount path. */
773 struct vnode *vp, /* Vnode to be covered. */
774 uint64_t fsflags, /* Flags common to all filesystems. */
775 struct vfsoptlist **optlist /* Options local to the filesystem. */
783 ASSERT_VOP_ELOCKED(vp, __func__);
784 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
787 * If the user is not root, ensure that they own the directory
788 * onto which we are attempting to mount.
790 error = VOP_GETATTR(vp, &va, td->td_ucred);
791 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
792 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
794 error = vinvalbuf(vp, V_SAVE, 0, 0);
795 if (error == 0 && vp->v_type != VDIR)
799 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
800 vp->v_iflag |= VI_MOUNT;
811 /* Allocate and initialize the filesystem. */
812 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
813 /* XXXMAC: pass to vfs_mount_alloc? */
814 mp->mnt_optnew = *optlist;
815 /* Set the mount level flags. */
816 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
819 * Mount the filesystem.
820 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
821 * get. No freeing of cn_pnbuf.
823 error = VFS_MOUNT(mp);
826 mp->mnt_vnodecovered = NULL;
827 vfs_mount_destroy(mp);
829 vp->v_iflag &= ~VI_MOUNT;
835 if (mp->mnt_opt != NULL)
836 vfs_freeopts(mp->mnt_opt);
837 mp->mnt_opt = mp->mnt_optnew;
839 (void)VFS_STATFS(mp, &mp->mnt_stat);
842 * Prevent external consumers of mount options from reading mnt_optnew.
844 mp->mnt_optnew = NULL;
847 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
848 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
849 mp->mnt_kern_flag |= MNTK_ASYNC;
851 mp->mnt_kern_flag &= ~MNTK_ASYNC;
854 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
857 vp->v_iflag &= ~VI_MOUNT;
859 vp->v_mountedhere = mp;
860 /* Place the new filesystem at the end of the mount list. */
861 mtx_lock(&mountlist_mtx);
862 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
863 mtx_unlock(&mountlist_mtx);
864 vfs_event_signal(NULL, VQ_MOUNT, 0);
865 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
866 panic("mount: lost mount");
868 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td);
869 VOP_UNLOCK(newdp, 0);
870 mountcheckdirs(vp, newdp);
872 if ((mp->mnt_flag & MNT_RDONLY) == 0)
873 vfs_allocate_syncvnode(mp);
879 * vfs_domount_update(): update of mounted file system
883 struct thread *td, /* Calling thread. */
884 struct vnode *vp, /* Mount point vnode. */
885 uint64_t fsflags, /* Flags common to all filesystems. */
886 struct vfsoptlist **optlist /* Options local to the filesystem. */
889 struct export_args export;
892 int error, export_error, len;
895 ASSERT_VOP_ELOCKED(vp, __func__);
896 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
899 if ((vp->v_vflag & VV_ROOT) == 0) {
900 if (vfs_copyopt(*optlist, "export", &export, sizeof(export))
910 * We only allow the filesystem to be reloaded if it
911 * is currently mounted read-only.
914 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
916 return (EOPNOTSUPP); /* Needs translation */
919 * Only privileged root, or (if MNT_USER is set) the user that
920 * did the original mount is permitted to update it.
922 error = vfs_suser(mp, td);
927 if (vfs_busy(mp, MBF_NOWAIT)) {
932 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
938 vp->v_iflag |= VI_MOUNT;
943 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
948 mp->mnt_flag &= ~MNT_UPDATEMASK;
949 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
950 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
951 if ((mp->mnt_flag & MNT_ASYNC) == 0)
952 mp->mnt_kern_flag &= ~MNTK_ASYNC;
954 mp->mnt_optnew = *optlist;
955 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
958 * Mount the filesystem.
959 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
960 * get. No freeing of cn_pnbuf.
962 error = VFS_MOUNT(mp);
965 /* Process the export option. */
966 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp,
968 /* Assume that there is only 1 ABI for each length. */
970 case (sizeof(struct oexport_args)):
971 bzero(&export, sizeof(export));
973 case (sizeof(export)):
974 bcopy(bufp, &export, len);
975 export_error = vfs_export(mp, &export);
978 export_error = EINVAL;
985 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
989 * If we fail, restore old mount flags. MNT_QUOTA is special,
990 * because it is not part of MNT_UPDATEMASK, but it could have
991 * changed in the meantime if quotactl(2) was called.
992 * All in all we want current value of MNT_QUOTA, not the old
995 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
997 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
998 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
999 mp->mnt_kern_flag |= MNTK_ASYNC;
1001 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1007 if (mp->mnt_opt != NULL)
1008 vfs_freeopts(mp->mnt_opt);
1009 mp->mnt_opt = mp->mnt_optnew;
1011 (void)VFS_STATFS(mp, &mp->mnt_stat);
1013 * Prevent external consumers of mount options from reading
1016 mp->mnt_optnew = NULL;
1018 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1019 vfs_allocate_syncvnode(mp);
1021 vfs_deallocate_syncvnode(mp);
1025 vp->v_iflag &= ~VI_MOUNT;
1028 return (error != 0 ? error : export_error);
1032 * vfs_domount(): actually attempt a filesystem mount.
1036 struct thread *td, /* Calling thread. */
1037 const char *fstype, /* Filesystem type. */
1038 char *fspath, /* Mount path. */
1039 uint64_t fsflags, /* Flags common to all filesystems. */
1040 struct vfsoptlist **optlist /* Options local to the filesystem. */
1043 struct vfsconf *vfsp;
1044 struct nameidata nd;
1050 * Be ultra-paranoid about making sure the type and fspath
1051 * variables will fit in our mp buffers, including the
1054 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1055 return (ENAMETOOLONG);
1057 if (jailed(td->td_ucred) || usermount == 0) {
1058 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1063 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1065 if (fsflags & MNT_EXPORTED) {
1066 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1070 if (fsflags & MNT_SUIDDIR) {
1071 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1076 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1078 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1079 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1080 fsflags |= MNT_NOSUID | MNT_USER;
1083 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1085 if ((fsflags & MNT_UPDATE) == 0) {
1086 /* Don't try to load KLDs if we're mounting the root. */
1087 if (fsflags & MNT_ROOTFS)
1088 vfsp = vfs_byname(fstype);
1090 vfsp = vfs_byname_kld(fstype, td, &error);
1093 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1098 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1100 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1101 UIO_SYSSPACE, fspath, td);
1105 NDFREE(&nd, NDF_ONLY_PNBUF);
1107 if ((fsflags & MNT_UPDATE) == 0) {
1108 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1109 strcpy(pathbuf, fspath);
1110 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1111 /* debug.disablefullpath == 1 results in ENODEV */
1112 if (error == 0 || error == ENODEV) {
1113 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1116 free(pathbuf, M_TEMP);
1118 error = vfs_domount_update(td, vp, fsflags, optlist);
1124 * Unmount a filesystem.
1126 * Note: unmount takes a path to the vnode mounted on as argument, not
1127 * special file (as before).
1129 #ifndef _SYS_SYSPROTO_H_
1130 struct unmount_args {
1137 sys_unmount(struct thread *td, struct unmount_args *uap)
1139 struct nameidata nd;
1142 int error, id0, id1;
1144 AUDIT_ARG_VALUE(uap->flags);
1145 if (jailed(td->td_ucred) || usermount == 0) {
1146 error = priv_check(td, PRIV_VFS_UNMOUNT);
1151 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1152 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1154 free(pathbuf, M_TEMP);
1157 if (uap->flags & MNT_BYFSID) {
1158 AUDIT_ARG_TEXT(pathbuf);
1159 /* Decode the filesystem ID. */
1160 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1161 free(pathbuf, M_TEMP);
1165 mtx_lock(&mountlist_mtx);
1166 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1167 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1168 mp->mnt_stat.f_fsid.val[1] == id1) {
1173 mtx_unlock(&mountlist_mtx);
1176 * Try to find global path for path argument.
1178 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1179 UIO_SYSSPACE, pathbuf, td);
1180 if (namei(&nd) == 0) {
1181 NDFREE(&nd, NDF_ONLY_PNBUF);
1182 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1184 if (error == 0 || error == ENODEV)
1187 mtx_lock(&mountlist_mtx);
1188 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1189 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) {
1194 mtx_unlock(&mountlist_mtx);
1196 free(pathbuf, M_TEMP);
1199 * Previously we returned ENOENT for a nonexistent path and
1200 * EINVAL for a non-mountpoint. We cannot tell these apart
1201 * now, so in the !MNT_BYFSID case return the more likely
1202 * EINVAL for compatibility.
1204 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1208 * Don't allow unmounting the root filesystem.
1210 if (mp->mnt_flag & MNT_ROOTFS) {
1214 error = dounmount(mp, uap->flags, td);
1219 * Return error if any of the vnodes, ignoring the root vnode
1220 * and the syncer vnode, have non-zero usecount.
1222 * This function is purely advisory - it can return false positives
1226 vfs_check_usecounts(struct mount *mp)
1228 struct vnode *vp, *mvp;
1230 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1231 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON &&
1232 vp->v_usecount != 0) {
1234 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1244 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags)
1247 mtx_assert(MNT_MTX(mp), MA_OWNED);
1248 mp->mnt_kern_flag &= ~mntkflags;
1249 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) {
1250 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1254 if (coveredvp != NULL) {
1255 VOP_UNLOCK(coveredvp, 0);
1258 vn_finished_write(mp);
1262 * Do the actual filesystem unmount.
1265 dounmount(struct mount *mp, int flags, struct thread *td)
1267 struct vnode *coveredvp;
1269 uint64_t async_flag;
1272 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1273 mnt_gen_r = mp->mnt_gen;
1276 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1278 * Check for mp being unmounted while waiting for the
1279 * covered vnode lock.
1281 if (coveredvp->v_mountedhere != mp ||
1282 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1283 VOP_UNLOCK(coveredvp, 0);
1291 * Only privileged root, or (if MNT_USER is set) the user that did the
1292 * original mount is permitted to unmount this filesystem.
1294 error = vfs_suser(mp, td);
1296 if (coveredvp != NULL) {
1297 VOP_UNLOCK(coveredvp, 0);
1304 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF);
1306 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 ||
1307 (mp->mnt_flag & MNT_UPDATE) != 0 ||
1308 !TAILQ_EMPTY(&mp->mnt_uppers)) {
1309 dounmount_cleanup(mp, coveredvp, 0);
1312 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1313 if (flags & MNT_NONBUSY) {
1315 error = vfs_check_usecounts(mp);
1318 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT |
1323 /* Allow filesystems to detect that a forced unmount is in progress. */
1324 if (flags & MNT_FORCE) {
1325 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1328 * Must be done after setting MNTK_UNMOUNTF and before
1329 * waiting for mnt_lockref to become 0.
1335 if (mp->mnt_lockref) {
1336 mp->mnt_kern_flag |= MNTK_DRAINING;
1337 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1341 KASSERT(mp->mnt_lockref == 0,
1342 ("%s: invalid lock refcount in the drain path @ %s:%d",
1343 __func__, __FILE__, __LINE__));
1345 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1346 __func__, __FILE__, __LINE__));
1348 if (mp->mnt_flag & MNT_EXPUBLIC)
1349 vfs_setpublicfs(NULL, NULL, NULL);
1352 * From now, we can claim that the use reference on the
1353 * coveredvp is ours, and the ref can be released only by
1354 * successfull unmount by us, or left for later unmount
1355 * attempt. The previously acquired hold reference is no
1356 * longer needed to protect the vnode from reuse.
1358 if (coveredvp != NULL)
1361 vfs_msync(mp, MNT_WAIT);
1363 async_flag = mp->mnt_flag & MNT_ASYNC;
1364 mp->mnt_flag &= ~MNT_ASYNC;
1365 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1367 cache_purgevfs(mp, false); /* remove cache entries for this file sys */
1368 vfs_deallocate_syncvnode(mp);
1369 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 ||
1370 (error = VFS_SYNC(mp, MNT_WAIT)) == 0)
1371 error = VFS_UNMOUNT(mp, flags);
1372 vn_finished_write(mp);
1374 * If we failed to flush the dirty blocks for this mount point,
1375 * undo all the cdir/rdir and rootvnode changes we made above.
1376 * Unless we failed to do so because the device is reporting that
1377 * it doesn't exist anymore.
1379 if (error && error != ENXIO) {
1381 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1382 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1384 vfs_allocate_syncvnode(mp);
1387 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1388 mp->mnt_flag |= async_flag;
1389 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1390 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1391 mp->mnt_kern_flag |= MNTK_ASYNC;
1392 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1393 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1398 VOP_UNLOCK(coveredvp, 0);
1401 mtx_lock(&mountlist_mtx);
1402 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1403 mtx_unlock(&mountlist_mtx);
1404 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td);
1405 if (coveredvp != NULL) {
1406 coveredvp->v_mountedhere = NULL;
1407 VOP_UNLOCK(coveredvp, 0);
1409 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1410 if (rootvnode != NULL && mp == rootvnode->v_mount) {
1414 if (mp == rootdevmp)
1416 vfs_mount_destroy(mp);
1421 * Report errors during filesystem mounting.
1424 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1426 struct vfsoptlist *moptlist = mp->mnt_optnew;
1431 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1432 if (error || errmsg == NULL || len <= 0)
1436 vsnprintf(errmsg, (size_t)len, fmt, ap);
1441 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1447 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1448 if (error || errmsg == NULL || len <= 0)
1452 vsnprintf(errmsg, (size_t)len, fmt, ap);
1457 * ---------------------------------------------------------------------
1458 * Functions for querying mount options/arguments from filesystems.
1462 * Check that no unknown options are given
1465 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1469 const char **t, *p, *q;
1472 TAILQ_FOREACH(opt, opts, link) {
1475 if (p[0] == 'n' && p[1] == 'o')
1477 for(t = global_opts; *t != NULL; t++) {
1478 if (strcmp(*t, p) == 0)
1481 if (strcmp(*t, q) == 0)
1487 for(t = legal; *t != NULL; t++) {
1488 if (strcmp(*t, p) == 0)
1491 if (strcmp(*t, q) == 0)
1497 snprintf(errmsg, sizeof(errmsg),
1498 "mount option <%s> is unknown", p);
1502 TAILQ_FOREACH(opt, opts, link) {
1503 if (strcmp(opt->name, "errmsg") == 0) {
1504 strncpy((char *)opt->value, errmsg, opt->len);
1509 printf("%s\n", errmsg);
1515 * Get a mount option by its name.
1517 * Return 0 if the option was found, ENOENT otherwise.
1518 * If len is non-NULL it will be filled with the length
1519 * of the option. If buf is non-NULL, it will be filled
1520 * with the address of the option.
1523 vfs_getopt(struct vfsoptlist *opts, const char *name, void **buf, int *len)
1527 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1529 TAILQ_FOREACH(opt, opts, link) {
1530 if (strcmp(name, opt->name) == 0) {
1543 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1550 TAILQ_FOREACH(opt, opts, link) {
1551 if (strcmp(name, opt->name) == 0) {
1560 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1562 char *opt_value, *vtp;
1566 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1569 if (opt_len == 0 || opt_value == NULL)
1571 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1573 iv = strtoq(opt_value, &vtp, 0);
1574 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1602 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1607 TAILQ_FOREACH(opt, opts, link) {
1608 if (strcmp(name, opt->name) != 0)
1611 if (opt->len == 0 ||
1612 ((char *)opt->value)[opt->len - 1] != '\0') {
1616 return (opt->value);
1623 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1628 TAILQ_FOREACH(opt, opts, link) {
1629 if (strcmp(name, opt->name) == 0) {
1642 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1648 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1650 TAILQ_FOREACH(opt, opts, link) {
1651 if (strcmp(name, opt->name) != 0)
1654 if (opt->len == 0 || opt->value == NULL)
1656 if (((char *)opt->value)[opt->len - 1] != '\0')
1659 ret = vsscanf(opt->value, fmt, ap);
1667 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1671 TAILQ_FOREACH(opt, opts, link) {
1672 if (strcmp(name, opt->name) != 0)
1675 if (opt->value == NULL)
1678 if (opt->len != len)
1680 bcopy(value, opt->value, len);
1688 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1692 TAILQ_FOREACH(opt, opts, link) {
1693 if (strcmp(name, opt->name) != 0)
1696 if (opt->value == NULL)
1702 bcopy(value, opt->value, len);
1710 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1714 TAILQ_FOREACH(opt, opts, link) {
1715 if (strcmp(name, opt->name) != 0)
1718 if (opt->value == NULL)
1719 opt->len = strlen(value) + 1;
1720 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1728 * Find and copy a mount option.
1730 * The size of the buffer has to be specified
1731 * in len, if it is not the same length as the
1732 * mount option, EINVAL is returned.
1733 * Returns ENOENT if the option is not found.
1736 vfs_copyopt(struct vfsoptlist *opts, const char *name, void *dest, int len)
1740 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1742 TAILQ_FOREACH(opt, opts, link) {
1743 if (strcmp(name, opt->name) == 0) {
1745 if (len != opt->len)
1747 bcopy(opt->value, dest, opt->len);
1755 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1759 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1760 if (sbp != &mp->mnt_stat)
1761 *sbp = mp->mnt_stat;
1766 vfs_mountedfrom(struct mount *mp, const char *from)
1769 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1770 strlcpy(mp->mnt_stat.f_mntfromname, from,
1771 sizeof mp->mnt_stat.f_mntfromname);
1775 * ---------------------------------------------------------------------
1776 * This is the api for building mount args and mounting filesystems from
1777 * inside the kernel.
1779 * The API works by accumulation of individual args. First error is
1782 * XXX: should be documented in new manpage kernel_mount(9)
1785 /* A memory allocation which must be freed when we are done */
1787 SLIST_ENTRY(mntaarg) next;
1790 /* The header for the mount arguments */
1795 SLIST_HEAD(, mntaarg) list;
1799 * Add a boolean argument.
1801 * flag is the boolean value.
1802 * name must start with "no".
1805 mount_argb(struct mntarg *ma, int flag, const char *name)
1808 KASSERT(name[0] == 'n' && name[1] == 'o',
1809 ("mount_argb(...,%s): name must start with 'no'", name));
1811 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1815 * Add an argument printf style
1818 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1821 struct mntaarg *maa;
1826 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1827 SLIST_INIT(&ma->list);
1832 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1834 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1835 ma->v[ma->len].iov_len = strlen(name) + 1;
1838 sb = sbuf_new_auto();
1840 sbuf_vprintf(sb, fmt, ap);
1843 len = sbuf_len(sb) + 1;
1844 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1845 SLIST_INSERT_HEAD(&ma->list, maa, next);
1846 bcopy(sbuf_data(sb), maa + 1, len);
1849 ma->v[ma->len].iov_base = maa + 1;
1850 ma->v[ma->len].iov_len = len;
1857 * Add an argument which is a userland string.
1860 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1862 struct mntaarg *maa;
1868 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1869 SLIST_INIT(&ma->list);
1873 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1874 SLIST_INSERT_HEAD(&ma->list, maa, next);
1875 tbuf = (void *)(maa + 1);
1876 ma->error = copyinstr(val, tbuf, len, NULL);
1877 return (mount_arg(ma, name, tbuf, -1));
1883 * If length is -1, treat value as a C string.
1886 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1890 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1891 SLIST_INIT(&ma->list);
1896 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1898 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1899 ma->v[ma->len].iov_len = strlen(name) + 1;
1902 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1904 ma->v[ma->len].iov_len = strlen(val) + 1;
1906 ma->v[ma->len].iov_len = len;
1912 * Free a mntarg structure
1915 free_mntarg(struct mntarg *ma)
1917 struct mntaarg *maa;
1919 while (!SLIST_EMPTY(&ma->list)) {
1920 maa = SLIST_FIRST(&ma->list);
1921 SLIST_REMOVE_HEAD(&ma->list, next);
1924 free(ma->v, M_MOUNT);
1929 * Mount a filesystem
1932 kernel_mount(struct mntarg *ma, uint64_t flags)
1937 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
1938 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
1939 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
1941 auio.uio_iov = ma->v;
1942 auio.uio_iovcnt = ma->len;
1943 auio.uio_segflg = UIO_SYSSPACE;
1947 error = vfs_donmount(curthread, flags, &auio);
1953 * A printflike function to mount a filesystem.
1956 kernel_vmount(int flags, ...)
1958 struct mntarg *ma = NULL;
1964 va_start(ap, flags);
1966 cp = va_arg(ap, const char *);
1969 vp = va_arg(ap, const void *);
1970 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
1974 error = kernel_mount(ma, flags);
1979 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
1982 bcopy(oexp, exp, sizeof(*oexp));
1983 exp->ex_numsecflavors = 0;