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.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
42 #include <sys/fcntl.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>
52 #include <sys/filedesc.h>
53 #include <sys/reboot.h>
55 #include <sys/syscallsubr.h>
56 #include <sys/sysproto.h>
58 #include <sys/sysctl.h>
59 #include <sys/sysent.h>
60 #include <sys/systm.h>
61 #include <sys/vnode.h>
64 #include <geom/geom.h>
66 #include <machine/stdarg.h>
68 #include <security/audit/audit.h>
69 #include <security/mac/mac_framework.h>
71 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
73 static int vfs_domount(struct thread *td, const char *fstype,
74 char *fspath, int fsflags, struct vfsoptlist **optlist);
75 static void free_mntarg(struct mntarg *ma);
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");
81 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
82 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker");
83 static uma_zone_t mount_zone;
85 /* List of mounted filesystems. */
86 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
88 /* For any iteration/modification of mountlist */
89 struct mtx mountlist_mtx;
90 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
93 * Global opts, taken by all filesystems
95 static const char *global_opts[] = {
107 mount_init(void *mem, int size, int flags)
111 mp = (struct mount *)mem;
112 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
113 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
118 mount_fini(void *mem, int size)
122 mp = (struct mount *)mem;
123 lockdestroy(&mp->mnt_explock);
124 mtx_destroy(&mp->mnt_mtx);
128 vfs_mount_init(void *dummy __unused)
131 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
132 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
134 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
137 * ---------------------------------------------------------------------
138 * Functions for building and sanitizing the mount options
141 /* Remove one mount option. */
143 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
146 TAILQ_REMOVE(opts, opt, link);
147 free(opt->name, M_MOUNT);
148 if (opt->value != NULL)
149 free(opt->value, M_MOUNT);
153 /* Release all resources related to the mount options. */
155 vfs_freeopts(struct vfsoptlist *opts)
159 while (!TAILQ_EMPTY(opts)) {
160 opt = TAILQ_FIRST(opts);
161 vfs_freeopt(opts, opt);
167 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
169 struct vfsopt *opt, *temp;
173 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
174 if (strcmp(opt->name, name) == 0)
175 vfs_freeopt(opts, opt);
180 vfs_isopt_ro(const char *opt)
183 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
184 strcmp(opt, "norw") == 0)
190 vfs_isopt_rw(const char *opt)
193 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
199 * Check if options are equal (with or without the "no" prefix).
202 vfs_equalopts(const char *opt1, const char *opt2)
206 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
207 if (strcmp(opt1, opt2) == 0)
209 /* "noopt" vs. "opt" */
210 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
212 /* "opt" vs. "noopt" */
213 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
215 while ((p = strchr(opt1, '.')) != NULL &&
216 !strncmp(opt1, opt2, ++p - opt1)) {
219 /* "foo.noopt" vs. "foo.opt" */
220 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
222 /* "foo.opt" vs. "foo.noopt" */
223 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
226 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */
227 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
228 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
234 * If a mount option is specified several times,
235 * (with or without the "no" prefix) only keep
236 * the last occurence of it.
239 vfs_sanitizeopts(struct vfsoptlist *opts)
241 struct vfsopt *opt, *opt2, *tmp;
243 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
244 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
245 while (opt2 != NULL) {
246 if (vfs_equalopts(opt->name, opt2->name)) {
247 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
248 vfs_freeopt(opts, opt2);
251 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
258 * Build a linked list of mount options from a struct uio.
261 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
263 struct vfsoptlist *opts;
265 size_t memused, namelen, optlen;
266 unsigned int i, iovcnt;
269 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
272 iovcnt = auio->uio_iovcnt;
273 for (i = 0; i < iovcnt; i += 2) {
274 namelen = auio->uio_iov[i].iov_len;
275 optlen = auio->uio_iov[i + 1].iov_len;
276 memused += sizeof(struct vfsopt) + optlen + namelen;
278 * Avoid consuming too much memory, and attempts to overflow
281 if (memused > VFS_MOUNTARG_SIZE_MAX ||
282 optlen > VFS_MOUNTARG_SIZE_MAX ||
283 namelen > VFS_MOUNTARG_SIZE_MAX) {
288 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
289 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
296 * Do this early, so jumps to "bad" will free the current
299 TAILQ_INSERT_TAIL(opts, opt, link);
301 if (auio->uio_segflg == UIO_SYSSPACE) {
302 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
304 error = copyin(auio->uio_iov[i].iov_base, opt->name,
309 /* Ensure names are null-terminated strings. */
310 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
316 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
317 if (auio->uio_segflg == UIO_SYSSPACE) {
318 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
321 error = copyin(auio->uio_iov[i + 1].iov_base,
328 vfs_sanitizeopts(opts);
337 * Merge the old mount options with the new ones passed
338 * in the MNT_UPDATE case.
340 * XXX: This function will keep a "nofoo" option in the new
341 * options. E.g, if the option's canonical name is "foo",
342 * "nofoo" ends up in the mount point's active options.
345 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
347 struct vfsopt *opt, *new;
349 TAILQ_FOREACH(opt, oldopts, link) {
350 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
351 new->name = strdup(opt->name, M_MOUNT);
353 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
354 bcopy(opt->value, new->value, opt->len);
358 new->seen = opt->seen;
359 TAILQ_INSERT_HEAD(toopts, new, link);
361 vfs_sanitizeopts(toopts);
365 * Mount a filesystem.
370 struct nmount_args /* {
380 AUDIT_ARG_FFLAGS(uap->flags);
381 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
382 uap->iovp, uap->iovcnt, uap->flags);
385 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
386 * userspace to set this flag, but we must filter it out if we want
387 * MNT_UPDATE on the root file system to work.
388 * MNT_ROOTFS should only be set by the kernel when mounting its
391 uap->flags &= ~MNT_ROOTFS;
393 iovcnt = uap->iovcnt;
395 * Check that we have an even number of iovec's
396 * and that we have at least two options.
398 if ((iovcnt & 1) || (iovcnt < 4)) {
399 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
404 error = copyinuio(uap->iovp, iovcnt, &auio);
406 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
410 error = vfs_donmount(td, uap->flags, auio);
417 * ---------------------------------------------------------------------
418 * Various utility functions
422 vfs_ref(struct mount *mp)
425 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
432 vfs_rel(struct mount *mp)
435 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
442 * Allocate and initialize the mount point struct.
445 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
450 mp = uma_zalloc(mount_zone, M_WAITOK);
451 bzero(&mp->mnt_startzero,
452 __rangeof(struct mount, mnt_startzero, mnt_endzero));
453 TAILQ_INIT(&mp->mnt_nvnodelist);
454 mp->mnt_nvnodelistsize = 0;
456 (void) vfs_busy(mp, MBF_NOWAIT);
457 mp->mnt_op = vfsp->vfc_vfsops;
459 vfsp->vfc_refcount++; /* XXX Unlocked */
460 mp->mnt_stat.f_type = vfsp->vfc_typenum;
462 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
463 mp->mnt_vnodecovered = vp;
464 mp->mnt_cred = crdup(cred);
465 mp->mnt_stat.f_owner = cred->cr_uid;
466 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
467 mp->mnt_iosize_max = DFLTPHYS;
470 mac_mount_create(cred, mp);
472 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
477 * Destroy the mount struct previously allocated by vfs_mount_alloc().
480 vfs_mount_destroy(struct mount *mp)
484 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
485 if (mp->mnt_kern_flag & MNTK_MWAIT) {
486 mp->mnt_kern_flag &= ~MNTK_MWAIT;
490 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
491 KASSERT(mp->mnt_ref == 0,
492 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
493 __FILE__, __LINE__));
494 if (mp->mnt_writeopcount != 0)
495 panic("vfs_mount_destroy: nonzero writeopcount");
496 if (mp->mnt_secondary_writes != 0)
497 panic("vfs_mount_destroy: nonzero secondary_writes");
498 mp->mnt_vfc->vfc_refcount--;
499 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
502 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
504 panic("unmount: dangling vnode");
506 if (mp->mnt_nvnodelistsize != 0)
507 panic("vfs_mount_destroy: nonzero nvnodelistsize");
508 if (mp->mnt_lockref != 0)
509 panic("vfs_mount_destroy: nonzero lock refcount");
512 mac_mount_destroy(mp);
514 if (mp->mnt_opt != NULL)
515 vfs_freeopts(mp->mnt_opt);
516 crfree(mp->mnt_cred);
517 uma_zfree(mount_zone, mp);
521 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions)
523 struct vfsoptlist *optlist;
524 struct vfsopt *opt, *tmp_opt;
525 char *fstype, *fspath, *errmsg;
526 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
528 errmsg = fspath = NULL;
529 errmsg_len = fspathlen = 0;
532 error = vfs_buildopts(fsoptions, &optlist);
536 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
537 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
540 * We need these two options before the others,
541 * and they are mandatory for any filesystem.
542 * Ensure they are NUL terminated as well.
545 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
546 if (error || fstype[fstypelen - 1] != '\0') {
549 strncpy(errmsg, "Invalid fstype", errmsg_len);
553 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
554 if (error || fspath[fspathlen - 1] != '\0') {
557 strncpy(errmsg, "Invalid fspath", errmsg_len);
562 * We need to see if we have the "update" option
563 * before we call vfs_domount(), since vfs_domount() has special
564 * logic based on MNT_UPDATE. This is very important
565 * when we want to update the root filesystem.
567 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
568 if (strcmp(opt->name, "update") == 0) {
569 fsflags |= MNT_UPDATE;
570 vfs_freeopt(optlist, opt);
572 else if (strcmp(opt->name, "async") == 0)
573 fsflags |= MNT_ASYNC;
574 else if (strcmp(opt->name, "force") == 0) {
575 fsflags |= MNT_FORCE;
576 vfs_freeopt(optlist, opt);
578 else if (strcmp(opt->name, "reload") == 0) {
579 fsflags |= MNT_RELOAD;
580 vfs_freeopt(optlist, opt);
582 else if (strcmp(opt->name, "multilabel") == 0)
583 fsflags |= MNT_MULTILABEL;
584 else if (strcmp(opt->name, "noasync") == 0)
585 fsflags &= ~MNT_ASYNC;
586 else if (strcmp(opt->name, "noatime") == 0)
587 fsflags |= MNT_NOATIME;
588 else if (strcmp(opt->name, "atime") == 0) {
589 free(opt->name, M_MOUNT);
590 opt->name = strdup("nonoatime", M_MOUNT);
592 else if (strcmp(opt->name, "noclusterr") == 0)
593 fsflags |= MNT_NOCLUSTERR;
594 else if (strcmp(opt->name, "clusterr") == 0) {
595 free(opt->name, M_MOUNT);
596 opt->name = strdup("nonoclusterr", M_MOUNT);
598 else if (strcmp(opt->name, "noclusterw") == 0)
599 fsflags |= MNT_NOCLUSTERW;
600 else if (strcmp(opt->name, "clusterw") == 0) {
601 free(opt->name, M_MOUNT);
602 opt->name = strdup("nonoclusterw", M_MOUNT);
604 else if (strcmp(opt->name, "noexec") == 0)
605 fsflags |= MNT_NOEXEC;
606 else if (strcmp(opt->name, "exec") == 0) {
607 free(opt->name, M_MOUNT);
608 opt->name = strdup("nonoexec", M_MOUNT);
610 else if (strcmp(opt->name, "nosuid") == 0)
611 fsflags |= MNT_NOSUID;
612 else if (strcmp(opt->name, "suid") == 0) {
613 free(opt->name, M_MOUNT);
614 opt->name = strdup("nonosuid", M_MOUNT);
616 else if (strcmp(opt->name, "nosymfollow") == 0)
617 fsflags |= MNT_NOSYMFOLLOW;
618 else if (strcmp(opt->name, "symfollow") == 0) {
619 free(opt->name, M_MOUNT);
620 opt->name = strdup("nonosymfollow", M_MOUNT);
622 else if (strcmp(opt->name, "noro") == 0)
623 fsflags &= ~MNT_RDONLY;
624 else if (strcmp(opt->name, "rw") == 0)
625 fsflags &= ~MNT_RDONLY;
626 else if (strcmp(opt->name, "ro") == 0)
627 fsflags |= MNT_RDONLY;
628 else if (strcmp(opt->name, "rdonly") == 0) {
629 free(opt->name, M_MOUNT);
630 opt->name = strdup("ro", M_MOUNT);
631 fsflags |= MNT_RDONLY;
633 else if (strcmp(opt->name, "suiddir") == 0)
634 fsflags |= MNT_SUIDDIR;
635 else if (strcmp(opt->name, "sync") == 0)
636 fsflags |= MNT_SYNCHRONOUS;
637 else if (strcmp(opt->name, "union") == 0)
638 fsflags |= MNT_UNION;
642 * Be ultra-paranoid about making sure the type and fspath
643 * variables will fit in our mp buffers, including the
646 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
647 error = ENAMETOOLONG;
651 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
653 /* copyout the errmsg */
654 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
655 && errmsg_len > 0 && errmsg != NULL) {
656 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
658 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
659 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
662 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
663 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
668 vfs_freeopts(optlist);
675 #ifndef _SYS_SYSPROTO_H_
687 struct mount_args /* {
695 struct vfsconf *vfsp = NULL;
696 struct mntarg *ma = NULL;
699 AUDIT_ARG_FFLAGS(uap->flags);
702 * Filter out MNT_ROOTFS. We do not want clients of mount() in
703 * userspace to set this flag, but we must filter it out if we want
704 * MNT_UPDATE on the root file system to work.
705 * MNT_ROOTFS should only be set by the kernel when mounting its
708 uap->flags &= ~MNT_ROOTFS;
710 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
711 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
713 free(fstype, M_TEMP);
717 AUDIT_ARG_TEXT(fstype);
719 vfsp = vfs_byname_kld(fstype, td, &error);
720 free(fstype, M_TEMP);
725 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
730 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN);
731 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
732 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro");
733 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid");
734 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec");
736 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags);
742 * vfs_domount_first(): first file system mount (not update)
746 struct thread *td, /* Calling thread. */
747 struct vfsconf *vfsp, /* File system type. */
748 char *fspath, /* Mount path. */
749 struct vnode *vp, /* Vnode to be covered. */
750 int fsflags, /* Flags common to all filesystems. */
751 struct vfsoptlist **optlist /* Options local to the filesystem. */
759 mtx_assert(&Giant, MA_OWNED);
760 ASSERT_VOP_ELOCKED(vp, __func__);
761 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
764 * If the user is not root, ensure that they own the directory
765 * onto which we are attempting to mount.
767 error = VOP_GETATTR(vp, &va, td->td_ucred);
768 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
769 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
771 error = vinvalbuf(vp, V_SAVE, 0, 0);
772 if (error == 0 && vp->v_type != VDIR)
776 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
777 vp->v_iflag |= VI_MOUNT;
788 /* Allocate and initialize the filesystem. */
789 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
790 /* XXXMAC: pass to vfs_mount_alloc? */
791 mp->mnt_optnew = *optlist;
792 /* Set the mount level flags. */
793 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
796 * Mount the filesystem.
797 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
798 * get. No freeing of cn_pnbuf.
800 error = VFS_MOUNT(mp);
803 vfs_mount_destroy(mp);
805 vp->v_iflag &= ~VI_MOUNT;
811 if (mp->mnt_opt != NULL)
812 vfs_freeopts(mp->mnt_opt);
813 mp->mnt_opt = mp->mnt_optnew;
815 (void)VFS_STATFS(mp, &mp->mnt_stat);
818 * Prevent external consumers of mount options from reading mnt_optnew.
820 mp->mnt_optnew = NULL;
823 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
824 mp->mnt_kern_flag |= MNTK_ASYNC;
826 mp->mnt_kern_flag &= ~MNTK_ASYNC;
829 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
832 vp->v_iflag &= ~VI_MOUNT;
834 vp->v_mountedhere = mp;
835 /* Place the new filesystem at the end of the mount list. */
836 mtx_lock(&mountlist_mtx);
837 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
838 mtx_unlock(&mountlist_mtx);
839 vfs_event_signal(NULL, VQ_MOUNT, 0);
840 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
841 panic("mount: lost mount");
842 VOP_UNLOCK(newdp, 0);
844 mountcheckdirs(vp, newdp);
846 if ((mp->mnt_flag & MNT_RDONLY) == 0)
847 vfs_allocate_syncvnode(mp);
853 * vfs_domount_update(): update of mounted file system
857 struct thread *td, /* Calling thread. */
858 struct vnode *vp, /* Mount point vnode. */
859 int fsflags, /* Flags common to all filesystems. */
860 struct vfsoptlist **optlist /* Options local to the filesystem. */
863 struct oexport_args oexport;
864 struct export_args export;
866 int error, export_error, flag;
868 mtx_assert(&Giant, MA_OWNED);
869 ASSERT_VOP_ELOCKED(vp, __func__);
870 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
872 if ((vp->v_vflag & VV_ROOT) == 0) {
878 * We only allow the filesystem to be reloaded if it
879 * is currently mounted read-only.
882 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
884 return (EOPNOTSUPP); /* Needs translation */
887 * Only privileged root, or (if MNT_USER is set) the user that
888 * did the original mount is permitted to update it.
890 error = vfs_suser(mp, td);
895 if (vfs_busy(mp, MBF_NOWAIT)) {
900 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
906 vp->v_iflag |= VI_MOUNT;
911 mp->mnt_flag &= ~MNT_UPDATEMASK;
912 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
913 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
914 if ((mp->mnt_flag & MNT_ASYNC) == 0)
915 mp->mnt_kern_flag &= ~MNTK_ASYNC;
917 mp->mnt_optnew = *optlist;
918 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
921 * Mount the filesystem.
922 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
923 * get. No freeing of cn_pnbuf.
925 error = VFS_MOUNT(mp);
929 /* Process the export option. */
930 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
931 sizeof(export)) == 0) {
932 export_error = vfs_export(mp, &export);
933 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
934 sizeof(oexport)) == 0) {
935 export.ex_flags = oexport.ex_flags;
936 export.ex_root = oexport.ex_root;
937 export.ex_anon = oexport.ex_anon;
938 export.ex_addr = oexport.ex_addr;
939 export.ex_addrlen = oexport.ex_addrlen;
940 export.ex_mask = oexport.ex_mask;
941 export.ex_masklen = oexport.ex_masklen;
942 export.ex_indexfile = oexport.ex_indexfile;
943 export.ex_numsecflavors = 0;
944 export_error = vfs_export(mp, &export);
950 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
954 * If we fail, restore old mount flags. MNT_QUOTA is special,
955 * because it is not part of MNT_UPDATEMASK, but it could have
956 * changed in the meantime if quotactl(2) was called.
957 * All in all we want current value of MNT_QUOTA, not the old
960 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
962 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
963 mp->mnt_kern_flag |= MNTK_ASYNC;
965 mp->mnt_kern_flag &= ~MNTK_ASYNC;
971 if (mp->mnt_opt != NULL)
972 vfs_freeopts(mp->mnt_opt);
973 mp->mnt_opt = mp->mnt_optnew;
975 (void)VFS_STATFS(mp, &mp->mnt_stat);
977 * Prevent external consumers of mount options from reading
980 mp->mnt_optnew = NULL;
982 if ((mp->mnt_flag & MNT_RDONLY) == 0)
983 vfs_allocate_syncvnode(mp);
985 vfs_deallocate_syncvnode(mp);
989 vp->v_iflag &= ~VI_MOUNT;
992 return (error != 0 ? error : export_error);
996 * vfs_domount(): actually attempt a filesystem mount.
1000 struct thread *td, /* Calling thread. */
1001 const char *fstype, /* Filesystem type. */
1002 char *fspath, /* Mount path. */
1003 int fsflags, /* Flags common to all filesystems. */
1004 struct vfsoptlist **optlist /* Options local to the filesystem. */
1007 struct vfsconf *vfsp;
1008 struct nameidata nd;
1013 * Be ultra-paranoid about making sure the type and fspath
1014 * variables will fit in our mp buffers, including the
1017 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1018 return (ENAMETOOLONG);
1020 if (jailed(td->td_ucred) || usermount == 0) {
1021 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1026 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1028 if (fsflags & MNT_EXPORTED) {
1029 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1033 if (fsflags & MNT_SUIDDIR) {
1034 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1039 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1041 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1042 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1043 fsflags |= MNT_NOSUID | MNT_USER;
1046 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1048 if ((fsflags & MNT_UPDATE) == 0) {
1049 /* Don't try to load KLDs if we're mounting the root. */
1050 if (fsflags & MNT_ROOTFS)
1051 vfsp = vfs_byname(fstype);
1053 vfsp = vfs_byname_kld(fstype, td, &error);
1056 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1061 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1063 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1064 UIO_SYSSPACE, fspath, td);
1068 if (!NDHASGIANT(&nd))
1070 NDFREE(&nd, NDF_ONLY_PNBUF);
1072 if ((fsflags & MNT_UPDATE) == 0) {
1073 error = vfs_domount_first(td, vfsp, fspath, vp, fsflags,
1076 error = vfs_domount_update(td, vp, fsflags, optlist);
1080 ASSERT_VI_UNLOCKED(vp, __func__);
1081 ASSERT_VOP_UNLOCKED(vp, __func__);
1087 * Unmount a filesystem.
1089 * Note: unmount takes a path to the vnode mounted on as argument, not
1090 * special file (as before).
1092 #ifndef _SYS_SYSPROTO_H_
1093 struct unmount_args {
1100 sys_unmount(td, uap)
1102 register struct unmount_args /* {
1109 int error, id0, id1;
1111 AUDIT_ARG_VALUE(uap->flags);
1112 if (jailed(td->td_ucred) || usermount == 0) {
1113 error = priv_check(td, PRIV_VFS_UNMOUNT);
1118 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1119 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1121 free(pathbuf, M_TEMP);
1125 if (uap->flags & MNT_BYFSID) {
1126 AUDIT_ARG_TEXT(pathbuf);
1127 /* Decode the filesystem ID. */
1128 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1130 free(pathbuf, M_TEMP);
1134 mtx_lock(&mountlist_mtx);
1135 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1136 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1137 mp->mnt_stat.f_fsid.val[1] == id1)
1140 mtx_unlock(&mountlist_mtx);
1142 AUDIT_ARG_UPATH1(td, pathbuf);
1143 mtx_lock(&mountlist_mtx);
1144 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1145 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1148 mtx_unlock(&mountlist_mtx);
1150 free(pathbuf, M_TEMP);
1153 * Previously we returned ENOENT for a nonexistent path and
1154 * EINVAL for a non-mountpoint. We cannot tell these apart
1155 * now, so in the !MNT_BYFSID case return the more likely
1156 * EINVAL for compatibility.
1159 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1163 * Don't allow unmounting the root filesystem.
1165 if (mp->mnt_flag & MNT_ROOTFS) {
1169 error = dounmount(mp, uap->flags, td);
1175 * Do the actual filesystem unmount.
1178 dounmount(mp, flags, td)
1183 struct vnode *coveredvp, *fsrootvp;
1188 mtx_assert(&Giant, MA_OWNED);
1190 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1191 mnt_gen_r = mp->mnt_gen;
1194 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1197 * Check for mp being unmounted while waiting for the
1198 * covered vnode lock.
1200 if (coveredvp->v_mountedhere != mp ||
1201 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1202 VOP_UNLOCK(coveredvp, 0);
1207 * Only privileged root, or (if MNT_USER is set) the user that did the
1208 * original mount is permitted to unmount this filesystem.
1210 error = vfs_suser(mp, td);
1213 VOP_UNLOCK(coveredvp, 0);
1218 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
1221 VOP_UNLOCK(coveredvp, 0);
1224 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1225 /* Allow filesystems to detect that a forced unmount is in progress. */
1226 if (flags & MNT_FORCE)
1227 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1229 if (mp->mnt_lockref) {
1230 mp->mnt_kern_flag |= MNTK_DRAINING;
1231 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1235 KASSERT(mp->mnt_lockref == 0,
1236 ("%s: invalid lock refcount in the drain path @ %s:%d",
1237 __func__, __FILE__, __LINE__));
1239 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1240 __func__, __FILE__, __LINE__));
1241 vn_start_write(NULL, &mp, V_WAIT);
1243 if (mp->mnt_flag & MNT_EXPUBLIC)
1244 vfs_setpublicfs(NULL, NULL, NULL);
1246 vfs_msync(mp, MNT_WAIT);
1248 async_flag = mp->mnt_flag & MNT_ASYNC;
1249 mp->mnt_flag &= ~MNT_ASYNC;
1250 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1252 cache_purgevfs(mp); /* remove cache entries for this file sys */
1253 vfs_deallocate_syncvnode(mp);
1255 * For forced unmounts, move process cdir/rdir refs on the fs root
1256 * vnode to the covered vnode. For non-forced unmounts we want
1257 * such references to cause an EBUSY error.
1259 if ((flags & MNT_FORCE) &&
1260 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1261 if (mp->mnt_vnodecovered != NULL)
1262 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1263 if (fsrootvp == rootvnode) {
1269 if (((mp->mnt_flag & MNT_RDONLY) ||
1270 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0)
1271 error = VFS_UNMOUNT(mp, flags);
1272 vn_finished_write(mp);
1274 * If we failed to flush the dirty blocks for this mount point,
1275 * undo all the cdir/rdir and rootvnode changes we made above.
1276 * Unless we failed to do so because the device is reporting that
1277 * it doesn't exist anymore.
1279 if (error && error != ENXIO) {
1280 if ((flags & MNT_FORCE) &&
1281 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1282 if (mp->mnt_vnodecovered != NULL)
1283 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1284 if (rootvnode == NULL) {
1285 rootvnode = fsrootvp;
1291 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1292 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1294 vfs_allocate_syncvnode(mp);
1297 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1298 mp->mnt_flag |= async_flag;
1299 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
1300 mp->mnt_kern_flag |= MNTK_ASYNC;
1301 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1302 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1307 VOP_UNLOCK(coveredvp, 0);
1310 mtx_lock(&mountlist_mtx);
1311 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1312 mtx_unlock(&mountlist_mtx);
1313 if (coveredvp != NULL) {
1314 coveredvp->v_mountedhere = NULL;
1317 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1318 vfs_mount_destroy(mp);
1323 * Report errors during filesystem mounting.
1326 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1328 struct vfsoptlist *moptlist = mp->mnt_optnew;
1333 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1334 if (error || errmsg == NULL || len <= 0)
1338 vsnprintf(errmsg, (size_t)len, fmt, ap);
1343 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1349 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1350 if (error || errmsg == NULL || len <= 0)
1354 vsnprintf(errmsg, (size_t)len, fmt, ap);
1359 * ---------------------------------------------------------------------
1360 * Functions for querying mount options/arguments from filesystems.
1364 * Check that no unknown options are given
1367 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1371 const char **t, *p, *q;
1374 TAILQ_FOREACH(opt, opts, link) {
1377 if (p[0] == 'n' && p[1] == 'o')
1379 for(t = global_opts; *t != NULL; t++) {
1380 if (strcmp(*t, p) == 0)
1383 if (strcmp(*t, q) == 0)
1389 for(t = legal; *t != NULL; t++) {
1390 if (strcmp(*t, p) == 0)
1393 if (strcmp(*t, q) == 0)
1399 snprintf(errmsg, sizeof(errmsg),
1400 "mount option <%s> is unknown", p);
1404 TAILQ_FOREACH(opt, opts, link) {
1405 if (strcmp(opt->name, "errmsg") == 0) {
1406 strncpy((char *)opt->value, errmsg, opt->len);
1411 printf("%s\n", errmsg);
1417 * Get a mount option by its name.
1419 * Return 0 if the option was found, ENOENT otherwise.
1420 * If len is non-NULL it will be filled with the length
1421 * of the option. If buf is non-NULL, it will be filled
1422 * with the address of the option.
1425 vfs_getopt(opts, name, buf, len)
1426 struct vfsoptlist *opts;
1433 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1435 TAILQ_FOREACH(opt, opts, link) {
1436 if (strcmp(name, opt->name) == 0) {
1449 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1456 TAILQ_FOREACH(opt, opts, link) {
1457 if (strcmp(name, opt->name) == 0) {
1466 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1471 TAILQ_FOREACH(opt, opts, link) {
1472 if (strcmp(name, opt->name) != 0)
1475 if (opt->len == 0 ||
1476 ((char *)opt->value)[opt->len - 1] != '\0') {
1480 return (opt->value);
1487 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1492 TAILQ_FOREACH(opt, opts, link) {
1493 if (strcmp(name, opt->name) == 0) {
1506 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1512 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1514 TAILQ_FOREACH(opt, opts, link) {
1515 if (strcmp(name, opt->name) != 0)
1518 if (opt->len == 0 || opt->value == NULL)
1520 if (((char *)opt->value)[opt->len - 1] != '\0')
1523 ret = vsscanf(opt->value, fmt, ap);
1531 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1535 TAILQ_FOREACH(opt, opts, link) {
1536 if (strcmp(name, opt->name) != 0)
1539 if (opt->value == NULL)
1542 if (opt->len != len)
1544 bcopy(value, opt->value, len);
1552 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1556 TAILQ_FOREACH(opt, opts, link) {
1557 if (strcmp(name, opt->name) != 0)
1560 if (opt->value == NULL)
1566 bcopy(value, opt->value, len);
1574 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1578 TAILQ_FOREACH(opt, opts, link) {
1579 if (strcmp(name, opt->name) != 0)
1582 if (opt->value == NULL)
1583 opt->len = strlen(value) + 1;
1584 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1592 * Find and copy a mount option.
1594 * The size of the buffer has to be specified
1595 * in len, if it is not the same length as the
1596 * mount option, EINVAL is returned.
1597 * Returns ENOENT if the option is not found.
1600 vfs_copyopt(opts, name, dest, len)
1601 struct vfsoptlist *opts;
1608 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1610 TAILQ_FOREACH(opt, opts, link) {
1611 if (strcmp(name, opt->name) == 0) {
1613 if (len != opt->len)
1615 bcopy(opt->value, dest, opt->len);
1623 * This is a helper function for filesystems to traverse their
1624 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h
1628 __mnt_vnode_next(struct vnode **mvp, struct mount *mp)
1632 mtx_assert(MNT_MTX(mp), MA_OWNED);
1634 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1635 if (should_yield()) {
1637 kern_yield(PRI_UNCHANGED);
1640 vp = TAILQ_NEXT(*mvp, v_nmntvnodes);
1641 while (vp != NULL && vp->v_type == VMARKER)
1642 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1644 /* Check if we are done */
1646 __mnt_vnode_markerfree(mvp, mp);
1649 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1650 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1655 __mnt_vnode_first(struct vnode **mvp, struct mount *mp)
1659 mtx_assert(MNT_MTX(mp), MA_OWNED);
1661 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1662 while (vp != NULL && vp->v_type == VMARKER)
1663 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1665 /* Check if we are done */
1672 *mvp = (struct vnode *) malloc(sizeof(struct vnode),
1676 (*mvp)->v_type = VMARKER;
1678 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1679 while (vp != NULL && vp->v_type == VMARKER)
1680 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1682 /* Check if we are done */
1685 free(*mvp, M_VNODE_MARKER);
1691 (*mvp)->v_mount = mp;
1692 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1698 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp)
1704 mtx_assert(MNT_MTX(mp), MA_OWNED);
1706 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1707 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1709 free(*mvp, M_VNODE_MARKER);
1717 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1721 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1722 if (sbp != &mp->mnt_stat)
1723 *sbp = mp->mnt_stat;
1728 vfs_mountedfrom(struct mount *mp, const char *from)
1731 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1732 strlcpy(mp->mnt_stat.f_mntfromname, from,
1733 sizeof mp->mnt_stat.f_mntfromname);
1737 * ---------------------------------------------------------------------
1738 * This is the api for building mount args and mounting filesystems from
1739 * inside the kernel.
1741 * The API works by accumulation of individual args. First error is
1744 * XXX: should be documented in new manpage kernel_mount(9)
1747 /* A memory allocation which must be freed when we are done */
1749 SLIST_ENTRY(mntaarg) next;
1752 /* The header for the mount arguments */
1757 SLIST_HEAD(, mntaarg) list;
1761 * Add a boolean argument.
1763 * flag is the boolean value.
1764 * name must start with "no".
1767 mount_argb(struct mntarg *ma, int flag, const char *name)
1770 KASSERT(name[0] == 'n' && name[1] == 'o',
1771 ("mount_argb(...,%s): name must start with 'no'", name));
1773 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1777 * Add an argument printf style
1780 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1783 struct mntaarg *maa;
1788 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1789 SLIST_INIT(&ma->list);
1794 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1796 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1797 ma->v[ma->len].iov_len = strlen(name) + 1;
1800 sb = sbuf_new_auto();
1802 sbuf_vprintf(sb, fmt, ap);
1805 len = sbuf_len(sb) + 1;
1806 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1807 SLIST_INSERT_HEAD(&ma->list, maa, next);
1808 bcopy(sbuf_data(sb), maa + 1, len);
1811 ma->v[ma->len].iov_base = maa + 1;
1812 ma->v[ma->len].iov_len = len;
1819 * Add an argument which is a userland string.
1822 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1824 struct mntaarg *maa;
1830 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1831 SLIST_INIT(&ma->list);
1835 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1836 SLIST_INSERT_HEAD(&ma->list, maa, next);
1837 tbuf = (void *)(maa + 1);
1838 ma->error = copyinstr(val, tbuf, len, NULL);
1839 return (mount_arg(ma, name, tbuf, -1));
1845 * If length is -1, treat value as a C string.
1848 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1852 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1853 SLIST_INIT(&ma->list);
1858 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1860 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1861 ma->v[ma->len].iov_len = strlen(name) + 1;
1864 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1866 ma->v[ma->len].iov_len = strlen(val) + 1;
1868 ma->v[ma->len].iov_len = len;
1874 * Free a mntarg structure
1877 free_mntarg(struct mntarg *ma)
1879 struct mntaarg *maa;
1881 while (!SLIST_EMPTY(&ma->list)) {
1882 maa = SLIST_FIRST(&ma->list);
1883 SLIST_REMOVE_HEAD(&ma->list, next);
1886 free(ma->v, M_MOUNT);
1891 * Mount a filesystem
1894 kernel_mount(struct mntarg *ma, int flags)
1899 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
1900 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
1901 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
1903 auio.uio_iov = ma->v;
1904 auio.uio_iovcnt = ma->len;
1905 auio.uio_segflg = UIO_SYSSPACE;
1909 error = vfs_donmount(curthread, flags, &auio);
1915 * A printflike function to mount a filesystem.
1918 kernel_vmount(int flags, ...)
1920 struct mntarg *ma = NULL;
1926 va_start(ap, flags);
1928 cp = va_arg(ap, const char *);
1931 vp = va_arg(ap, const void *);
1932 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
1936 error = kernel_mount(ma, flags);
1941 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
1944 bcopy(oexp, exp, sizeof(*oexp));
1945 exp->ex_numsecflavors = 0;