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, char *fspath,
74 uint64_t 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 /* {
382 * Mount flags are now 64-bits. On 32-bit archtectures only
383 * 32-bits are passed in, but from here on everything handles
384 * 64-bit flags correctly.
388 AUDIT_ARG_FFLAGS(flags);
389 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
390 uap->iovp, uap->iovcnt, flags);
393 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
394 * userspace to set this flag, but we must filter it out if we want
395 * MNT_UPDATE on the root file system to work.
396 * MNT_ROOTFS should only be set by the kernel when mounting its
399 flags &= ~MNT_ROOTFS;
401 iovcnt = uap->iovcnt;
403 * Check that we have an even number of iovec's
404 * and that we have at least two options.
406 if ((iovcnt & 1) || (iovcnt < 4)) {
407 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
412 error = copyinuio(uap->iovp, iovcnt, &auio);
414 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
418 error = vfs_donmount(td, flags, auio);
425 * ---------------------------------------------------------------------
426 * Various utility functions
430 vfs_ref(struct mount *mp)
433 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
440 vfs_rel(struct mount *mp)
443 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
450 * Allocate and initialize the mount point struct.
453 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
458 mp = uma_zalloc(mount_zone, M_WAITOK);
459 bzero(&mp->mnt_startzero,
460 __rangeof(struct mount, mnt_startzero, mnt_endzero));
461 TAILQ_INIT(&mp->mnt_nvnodelist);
462 mp->mnt_nvnodelistsize = 0;
464 (void) vfs_busy(mp, MBF_NOWAIT);
465 mp->mnt_op = vfsp->vfc_vfsops;
467 vfsp->vfc_refcount++; /* XXX Unlocked */
468 mp->mnt_stat.f_type = vfsp->vfc_typenum;
470 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
471 mp->mnt_vnodecovered = vp;
472 mp->mnt_cred = crdup(cred);
473 mp->mnt_stat.f_owner = cred->cr_uid;
474 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
475 mp->mnt_iosize_max = DFLTPHYS;
478 mac_mount_create(cred, mp);
480 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
485 * Destroy the mount struct previously allocated by vfs_mount_alloc().
488 vfs_mount_destroy(struct mount *mp)
492 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
493 if (mp->mnt_kern_flag & MNTK_MWAIT) {
494 mp->mnt_kern_flag &= ~MNTK_MWAIT;
498 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
499 KASSERT(mp->mnt_ref == 0,
500 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
501 __FILE__, __LINE__));
502 if (mp->mnt_writeopcount != 0)
503 panic("vfs_mount_destroy: nonzero writeopcount");
504 if (mp->mnt_secondary_writes != 0)
505 panic("vfs_mount_destroy: nonzero secondary_writes");
506 mp->mnt_vfc->vfc_refcount--;
507 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
510 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
512 panic("unmount: dangling vnode");
514 if (mp->mnt_nvnodelistsize != 0)
515 panic("vfs_mount_destroy: nonzero nvnodelistsize");
516 if (mp->mnt_lockref != 0)
517 panic("vfs_mount_destroy: nonzero lock refcount");
520 mac_mount_destroy(mp);
522 if (mp->mnt_opt != NULL)
523 vfs_freeopts(mp->mnt_opt);
524 crfree(mp->mnt_cred);
525 uma_zfree(mount_zone, mp);
529 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
531 struct vfsoptlist *optlist;
532 struct vfsopt *opt, *tmp_opt;
533 char *fstype, *fspath, *errmsg;
534 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
536 errmsg = fspath = NULL;
537 errmsg_len = fspathlen = 0;
540 error = vfs_buildopts(fsoptions, &optlist);
544 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
545 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
548 * We need these two options before the others,
549 * and they are mandatory for any filesystem.
550 * Ensure they are NUL terminated as well.
553 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
554 if (error || fstype[fstypelen - 1] != '\0') {
557 strncpy(errmsg, "Invalid fstype", errmsg_len);
561 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
562 if (error || fspath[fspathlen - 1] != '\0') {
565 strncpy(errmsg, "Invalid fspath", errmsg_len);
570 * We need to see if we have the "update" option
571 * before we call vfs_domount(), since vfs_domount() has special
572 * logic based on MNT_UPDATE. This is very important
573 * when we want to update the root filesystem.
575 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
576 if (strcmp(opt->name, "update") == 0) {
577 fsflags |= MNT_UPDATE;
578 vfs_freeopt(optlist, opt);
580 else if (strcmp(opt->name, "async") == 0)
581 fsflags |= MNT_ASYNC;
582 else if (strcmp(opt->name, "force") == 0) {
583 fsflags |= MNT_FORCE;
584 vfs_freeopt(optlist, opt);
586 else if (strcmp(opt->name, "reload") == 0) {
587 fsflags |= MNT_RELOAD;
588 vfs_freeopt(optlist, opt);
590 else if (strcmp(opt->name, "multilabel") == 0)
591 fsflags |= MNT_MULTILABEL;
592 else if (strcmp(opt->name, "noasync") == 0)
593 fsflags &= ~MNT_ASYNC;
594 else if (strcmp(opt->name, "noatime") == 0)
595 fsflags |= MNT_NOATIME;
596 else if (strcmp(opt->name, "atime") == 0) {
597 free(opt->name, M_MOUNT);
598 opt->name = strdup("nonoatime", M_MOUNT);
600 else if (strcmp(opt->name, "noclusterr") == 0)
601 fsflags |= MNT_NOCLUSTERR;
602 else if (strcmp(opt->name, "clusterr") == 0) {
603 free(opt->name, M_MOUNT);
604 opt->name = strdup("nonoclusterr", M_MOUNT);
606 else if (strcmp(opt->name, "noclusterw") == 0)
607 fsflags |= MNT_NOCLUSTERW;
608 else if (strcmp(opt->name, "clusterw") == 0) {
609 free(opt->name, M_MOUNT);
610 opt->name = strdup("nonoclusterw", M_MOUNT);
612 else if (strcmp(opt->name, "noexec") == 0)
613 fsflags |= MNT_NOEXEC;
614 else if (strcmp(opt->name, "exec") == 0) {
615 free(opt->name, M_MOUNT);
616 opt->name = strdup("nonoexec", M_MOUNT);
618 else if (strcmp(opt->name, "nosuid") == 0)
619 fsflags |= MNT_NOSUID;
620 else if (strcmp(opt->name, "suid") == 0) {
621 free(opt->name, M_MOUNT);
622 opt->name = strdup("nonosuid", M_MOUNT);
624 else if (strcmp(opt->name, "nosymfollow") == 0)
625 fsflags |= MNT_NOSYMFOLLOW;
626 else if (strcmp(opt->name, "symfollow") == 0) {
627 free(opt->name, M_MOUNT);
628 opt->name = strdup("nonosymfollow", M_MOUNT);
630 else if (strcmp(opt->name, "noro") == 0)
631 fsflags &= ~MNT_RDONLY;
632 else if (strcmp(opt->name, "rw") == 0)
633 fsflags &= ~MNT_RDONLY;
634 else if (strcmp(opt->name, "ro") == 0)
635 fsflags |= MNT_RDONLY;
636 else if (strcmp(opt->name, "rdonly") == 0) {
637 free(opt->name, M_MOUNT);
638 opt->name = strdup("ro", M_MOUNT);
639 fsflags |= MNT_RDONLY;
641 else if (strcmp(opt->name, "suiddir") == 0)
642 fsflags |= MNT_SUIDDIR;
643 else if (strcmp(opt->name, "sync") == 0)
644 fsflags |= MNT_SYNCHRONOUS;
645 else if (strcmp(opt->name, "union") == 0)
646 fsflags |= MNT_UNION;
650 * Be ultra-paranoid about making sure the type and fspath
651 * variables will fit in our mp buffers, including the
654 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
655 error = ENAMETOOLONG;
659 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
661 /* copyout the errmsg */
662 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
663 && errmsg_len > 0 && errmsg != NULL) {
664 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
666 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
667 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
670 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
676 vfs_freeopts(optlist);
683 #ifndef _SYS_SYSPROTO_H_
695 struct mount_args /* {
703 struct vfsconf *vfsp = NULL;
704 struct mntarg *ma = NULL;
709 * Mount flags are now 64-bits. On 32-bit archtectures only
710 * 32-bits are passed in, but from here on everything handles
711 * 64-bit flags correctly.
715 AUDIT_ARG_FFLAGS(flags);
718 * Filter out MNT_ROOTFS. We do not want clients of mount() in
719 * userspace to set this flag, but we must filter it out if we want
720 * MNT_UPDATE on the root file system to work.
721 * MNT_ROOTFS should only be set by the kernel when mounting its
724 flags &= ~MNT_ROOTFS;
726 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
727 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
729 free(fstype, M_TEMP);
733 AUDIT_ARG_TEXT(fstype);
735 vfsp = vfs_byname_kld(fstype, td, &error);
736 free(fstype, M_TEMP);
741 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
746 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN);
747 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
748 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
749 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
750 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
752 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
758 * vfs_domount_first(): first file system mount (not update)
762 struct thread *td, /* Calling thread. */
763 struct vfsconf *vfsp, /* File system type. */
764 char *fspath, /* Mount path. */
765 struct vnode *vp, /* Vnode to be covered. */
766 uint64_t fsflags, /* Flags common to all filesystems. */
767 struct vfsoptlist **optlist /* Options local to the filesystem. */
775 mtx_assert(&Giant, MA_OWNED);
776 ASSERT_VOP_ELOCKED(vp, __func__);
777 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
780 * If the user is not root, ensure that they own the directory
781 * onto which we are attempting to mount.
783 error = VOP_GETATTR(vp, &va, td->td_ucred);
784 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
785 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
787 error = vinvalbuf(vp, V_SAVE, 0, 0);
788 if (error == 0 && vp->v_type != VDIR)
792 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
793 vp->v_iflag |= VI_MOUNT;
804 /* Allocate and initialize the filesystem. */
805 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
806 /* XXXMAC: pass to vfs_mount_alloc? */
807 mp->mnt_optnew = *optlist;
808 /* Set the mount level flags. */
809 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
812 * Mount the filesystem.
813 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
814 * get. No freeing of cn_pnbuf.
816 error = VFS_MOUNT(mp);
819 vfs_mount_destroy(mp);
821 vp->v_iflag &= ~VI_MOUNT;
827 if (mp->mnt_opt != NULL)
828 vfs_freeopts(mp->mnt_opt);
829 mp->mnt_opt = mp->mnt_optnew;
831 (void)VFS_STATFS(mp, &mp->mnt_stat);
834 * Prevent external consumers of mount options from reading mnt_optnew.
836 mp->mnt_optnew = NULL;
839 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
840 mp->mnt_kern_flag |= MNTK_ASYNC;
842 mp->mnt_kern_flag &= ~MNTK_ASYNC;
845 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
848 vp->v_iflag &= ~VI_MOUNT;
850 vp->v_mountedhere = mp;
851 /* Place the new filesystem at the end of the mount list. */
852 mtx_lock(&mountlist_mtx);
853 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
854 mtx_unlock(&mountlist_mtx);
855 vfs_event_signal(NULL, VQ_MOUNT, 0);
856 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
857 panic("mount: lost mount");
858 VOP_UNLOCK(newdp, 0);
860 mountcheckdirs(vp, newdp);
862 if ((mp->mnt_flag & MNT_RDONLY) == 0)
863 vfs_allocate_syncvnode(mp);
869 * vfs_domount_update(): update of mounted file system
873 struct thread *td, /* Calling thread. */
874 struct vnode *vp, /* Mount point vnode. */
875 uint64_t fsflags, /* Flags common to all filesystems. */
876 struct vfsoptlist **optlist /* Options local to the filesystem. */
879 struct oexport_args oexport;
880 struct export_args export;
882 int error, export_error;
885 mtx_assert(&Giant, MA_OWNED);
886 ASSERT_VOP_ELOCKED(vp, __func__);
887 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
889 if ((vp->v_vflag & VV_ROOT) == 0) {
895 * We only allow the filesystem to be reloaded if it
896 * is currently mounted read-only.
899 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
901 return (EOPNOTSUPP); /* Needs translation */
904 * Only privileged root, or (if MNT_USER is set) the user that
905 * did the original mount is permitted to update it.
907 error = vfs_suser(mp, td);
912 if (vfs_busy(mp, MBF_NOWAIT)) {
917 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
923 vp->v_iflag |= VI_MOUNT;
928 mp->mnt_flag &= ~MNT_UPDATEMASK;
929 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
930 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
931 if ((mp->mnt_flag & MNT_ASYNC) == 0)
932 mp->mnt_kern_flag &= ~MNTK_ASYNC;
934 mp->mnt_optnew = *optlist;
935 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
938 * Mount the filesystem.
939 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
940 * get. No freeing of cn_pnbuf.
942 error = VFS_MOUNT(mp);
946 /* Process the export option. */
947 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
948 sizeof(export)) == 0) {
949 export_error = vfs_export(mp, &export);
950 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
951 sizeof(oexport)) == 0) {
952 export.ex_flags = oexport.ex_flags;
953 export.ex_root = oexport.ex_root;
954 export.ex_anon = oexport.ex_anon;
955 export.ex_addr = oexport.ex_addr;
956 export.ex_addrlen = oexport.ex_addrlen;
957 export.ex_mask = oexport.ex_mask;
958 export.ex_masklen = oexport.ex_masklen;
959 export.ex_indexfile = oexport.ex_indexfile;
960 export.ex_numsecflavors = 0;
961 export_error = vfs_export(mp, &export);
967 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
971 * If we fail, restore old mount flags. MNT_QUOTA is special,
972 * because it is not part of MNT_UPDATEMASK, but it could have
973 * changed in the meantime if quotactl(2) was called.
974 * All in all we want current value of MNT_QUOTA, not the old
977 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
979 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
980 mp->mnt_kern_flag |= MNTK_ASYNC;
982 mp->mnt_kern_flag &= ~MNTK_ASYNC;
988 if (mp->mnt_opt != NULL)
989 vfs_freeopts(mp->mnt_opt);
990 mp->mnt_opt = mp->mnt_optnew;
992 (void)VFS_STATFS(mp, &mp->mnt_stat);
994 * Prevent external consumers of mount options from reading
997 mp->mnt_optnew = NULL;
999 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1000 vfs_allocate_syncvnode(mp);
1002 vfs_deallocate_syncvnode(mp);
1006 vp->v_iflag &= ~VI_MOUNT;
1009 return (error != 0 ? error : export_error);
1013 * vfs_domount(): actually attempt a filesystem mount.
1017 struct thread *td, /* Calling thread. */
1018 const char *fstype, /* Filesystem type. */
1019 char *fspath, /* Mount path. */
1020 uint64_t fsflags, /* Flags common to all filesystems. */
1021 struct vfsoptlist **optlist /* Options local to the filesystem. */
1024 struct vfsconf *vfsp;
1025 struct nameidata nd;
1031 * Be ultra-paranoid about making sure the type and fspath
1032 * variables will fit in our mp buffers, including the
1035 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1036 return (ENAMETOOLONG);
1038 if (jailed(td->td_ucred) || usermount == 0) {
1039 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1044 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1046 if (fsflags & MNT_EXPORTED) {
1047 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1051 if (fsflags & MNT_SUIDDIR) {
1052 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1057 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1059 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1060 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1061 fsflags |= MNT_NOSUID | MNT_USER;
1064 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1066 if ((fsflags & MNT_UPDATE) == 0) {
1067 /* Don't try to load KLDs if we're mounting the root. */
1068 if (fsflags & MNT_ROOTFS)
1069 vfsp = vfs_byname(fstype);
1071 vfsp = vfs_byname_kld(fstype, td, &error);
1074 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1079 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1081 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1082 UIO_SYSSPACE, fspath, td);
1086 if (!NDHASGIANT(&nd))
1088 NDFREE(&nd, NDF_ONLY_PNBUF);
1090 if ((fsflags & MNT_UPDATE) == 0) {
1091 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1092 strcpy(pathbuf, fspath);
1093 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1094 /* debug.disablefullpath == 1 results in ENODEV */
1095 if (error == 0 || error == ENODEV) {
1096 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1099 free(pathbuf, M_TEMP);
1101 error = vfs_domount_update(td, vp, fsflags, optlist);
1104 ASSERT_VI_UNLOCKED(vp, __func__);
1105 ASSERT_VOP_UNLOCKED(vp, __func__);
1111 * Unmount a filesystem.
1113 * Note: unmount takes a path to the vnode mounted on as argument, not
1114 * special file (as before).
1116 #ifndef _SYS_SYSPROTO_H_
1117 struct unmount_args {
1124 sys_unmount(td, uap)
1126 register struct unmount_args /* {
1131 struct nameidata nd;
1134 int error, id0, id1, vfslocked;
1136 AUDIT_ARG_VALUE(uap->flags);
1137 if (jailed(td->td_ucred) || usermount == 0) {
1138 error = priv_check(td, PRIV_VFS_UNMOUNT);
1143 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1144 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1146 free(pathbuf, M_TEMP);
1150 if (uap->flags & MNT_BYFSID) {
1151 AUDIT_ARG_TEXT(pathbuf);
1152 /* Decode the filesystem ID. */
1153 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1155 free(pathbuf, M_TEMP);
1159 mtx_lock(&mountlist_mtx);
1160 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1161 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1162 mp->mnt_stat.f_fsid.val[1] == id1)
1165 mtx_unlock(&mountlist_mtx);
1167 AUDIT_ARG_UPATH1(td, pathbuf);
1169 * Try to find global path for path argument.
1172 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1173 UIO_SYSSPACE, pathbuf, td);
1174 if (namei(&nd) == 0) {
1175 vfslocked = NDHASGIANT(&nd);
1176 NDFREE(&nd, NDF_ONLY_PNBUF);
1177 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1179 if (error == 0 || error == ENODEV)
1181 VFS_UNLOCK_GIANT(vfslocked);
1183 mtx_lock(&mountlist_mtx);
1184 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1185 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1188 mtx_unlock(&mountlist_mtx);
1190 free(pathbuf, M_TEMP);
1193 * Previously we returned ENOENT for a nonexistent path and
1194 * EINVAL for a non-mountpoint. We cannot tell these apart
1195 * now, so in the !MNT_BYFSID case return the more likely
1196 * EINVAL for compatibility.
1199 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1203 * Don't allow unmounting the root filesystem.
1205 if (mp->mnt_flag & MNT_ROOTFS) {
1209 error = dounmount(mp, uap->flags, td);
1215 * Do the actual filesystem unmount.
1218 dounmount(mp, flags, td)
1223 struct vnode *coveredvp, *fsrootvp;
1225 uint64_t async_flag;
1228 mtx_assert(&Giant, MA_OWNED);
1230 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1231 mnt_gen_r = mp->mnt_gen;
1234 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1237 * Check for mp being unmounted while waiting for the
1238 * covered vnode lock.
1240 if (coveredvp->v_mountedhere != mp ||
1241 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1242 VOP_UNLOCK(coveredvp, 0);
1247 * Only privileged root, or (if MNT_USER is set) the user that did the
1248 * original mount is permitted to unmount this filesystem.
1250 error = vfs_suser(mp, td);
1253 VOP_UNLOCK(coveredvp, 0);
1258 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
1261 VOP_UNLOCK(coveredvp, 0);
1264 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1265 /* Allow filesystems to detect that a forced unmount is in progress. */
1266 if (flags & MNT_FORCE)
1267 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1269 if (mp->mnt_lockref) {
1270 mp->mnt_kern_flag |= MNTK_DRAINING;
1271 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1275 KASSERT(mp->mnt_lockref == 0,
1276 ("%s: invalid lock refcount in the drain path @ %s:%d",
1277 __func__, __FILE__, __LINE__));
1279 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1280 __func__, __FILE__, __LINE__));
1281 vn_start_write(NULL, &mp, V_WAIT);
1283 if (mp->mnt_flag & MNT_EXPUBLIC)
1284 vfs_setpublicfs(NULL, NULL, NULL);
1286 vfs_msync(mp, MNT_WAIT);
1288 async_flag = mp->mnt_flag & MNT_ASYNC;
1289 mp->mnt_flag &= ~MNT_ASYNC;
1290 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1292 cache_purgevfs(mp); /* remove cache entries for this file sys */
1293 vfs_deallocate_syncvnode(mp);
1295 * For forced unmounts, move process cdir/rdir refs on the fs root
1296 * vnode to the covered vnode. For non-forced unmounts we want
1297 * such references to cause an EBUSY error.
1299 if ((flags & MNT_FORCE) &&
1300 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1301 if (mp->mnt_vnodecovered != NULL)
1302 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1303 if (fsrootvp == rootvnode) {
1309 if (((mp->mnt_flag & MNT_RDONLY) ||
1310 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0)
1311 error = VFS_UNMOUNT(mp, flags);
1312 vn_finished_write(mp);
1314 * If we failed to flush the dirty blocks for this mount point,
1315 * undo all the cdir/rdir and rootvnode changes we made above.
1316 * Unless we failed to do so because the device is reporting that
1317 * it doesn't exist anymore.
1319 if (error && error != ENXIO) {
1320 if ((flags & MNT_FORCE) &&
1321 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1322 if (mp->mnt_vnodecovered != NULL)
1323 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1324 if (rootvnode == NULL) {
1325 rootvnode = fsrootvp;
1331 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1332 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1334 vfs_allocate_syncvnode(mp);
1337 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1338 mp->mnt_flag |= async_flag;
1339 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
1340 mp->mnt_kern_flag |= MNTK_ASYNC;
1341 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1342 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1347 VOP_UNLOCK(coveredvp, 0);
1350 mtx_lock(&mountlist_mtx);
1351 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1352 mtx_unlock(&mountlist_mtx);
1353 if (coveredvp != NULL) {
1354 coveredvp->v_mountedhere = NULL;
1357 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1358 vfs_mount_destroy(mp);
1363 * Report errors during filesystem mounting.
1366 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1368 struct vfsoptlist *moptlist = mp->mnt_optnew;
1373 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1374 if (error || errmsg == NULL || len <= 0)
1378 vsnprintf(errmsg, (size_t)len, fmt, ap);
1383 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1389 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1390 if (error || errmsg == NULL || len <= 0)
1394 vsnprintf(errmsg, (size_t)len, fmt, ap);
1399 * ---------------------------------------------------------------------
1400 * Functions for querying mount options/arguments from filesystems.
1404 * Check that no unknown options are given
1407 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1411 const char **t, *p, *q;
1414 TAILQ_FOREACH(opt, opts, link) {
1417 if (p[0] == 'n' && p[1] == 'o')
1419 for(t = global_opts; *t != NULL; t++) {
1420 if (strcmp(*t, p) == 0)
1423 if (strcmp(*t, q) == 0)
1429 for(t = legal; *t != NULL; t++) {
1430 if (strcmp(*t, p) == 0)
1433 if (strcmp(*t, q) == 0)
1439 snprintf(errmsg, sizeof(errmsg),
1440 "mount option <%s> is unknown", p);
1444 TAILQ_FOREACH(opt, opts, link) {
1445 if (strcmp(opt->name, "errmsg") == 0) {
1446 strncpy((char *)opt->value, errmsg, opt->len);
1451 printf("%s\n", errmsg);
1457 * Get a mount option by its name.
1459 * Return 0 if the option was found, ENOENT otherwise.
1460 * If len is non-NULL it will be filled with the length
1461 * of the option. If buf is non-NULL, it will be filled
1462 * with the address of the option.
1465 vfs_getopt(opts, name, buf, len)
1466 struct vfsoptlist *opts;
1473 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1475 TAILQ_FOREACH(opt, opts, link) {
1476 if (strcmp(name, opt->name) == 0) {
1489 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1496 TAILQ_FOREACH(opt, opts, link) {
1497 if (strcmp(name, opt->name) == 0) {
1506 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1511 TAILQ_FOREACH(opt, opts, link) {
1512 if (strcmp(name, opt->name) != 0)
1515 if (opt->len == 0 ||
1516 ((char *)opt->value)[opt->len - 1] != '\0') {
1520 return (opt->value);
1527 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1532 TAILQ_FOREACH(opt, opts, link) {
1533 if (strcmp(name, opt->name) == 0) {
1546 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1552 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1554 TAILQ_FOREACH(opt, opts, link) {
1555 if (strcmp(name, opt->name) != 0)
1558 if (opt->len == 0 || opt->value == NULL)
1560 if (((char *)opt->value)[opt->len - 1] != '\0')
1563 ret = vsscanf(opt->value, fmt, ap);
1571 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1575 TAILQ_FOREACH(opt, opts, link) {
1576 if (strcmp(name, opt->name) != 0)
1579 if (opt->value == NULL)
1582 if (opt->len != len)
1584 bcopy(value, opt->value, len);
1592 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1596 TAILQ_FOREACH(opt, opts, link) {
1597 if (strcmp(name, opt->name) != 0)
1600 if (opt->value == NULL)
1606 bcopy(value, opt->value, len);
1614 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1618 TAILQ_FOREACH(opt, opts, link) {
1619 if (strcmp(name, opt->name) != 0)
1622 if (opt->value == NULL)
1623 opt->len = strlen(value) + 1;
1624 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1632 * Find and copy a mount option.
1634 * The size of the buffer has to be specified
1635 * in len, if it is not the same length as the
1636 * mount option, EINVAL is returned.
1637 * Returns ENOENT if the option is not found.
1640 vfs_copyopt(opts, name, dest, len)
1641 struct vfsoptlist *opts;
1648 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1650 TAILQ_FOREACH(opt, opts, link) {
1651 if (strcmp(name, opt->name) == 0) {
1653 if (len != opt->len)
1655 bcopy(opt->value, dest, opt->len);
1663 * This is a helper function for filesystems to traverse their
1664 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h
1668 __mnt_vnode_next(struct vnode **mvp, struct mount *mp)
1672 mtx_assert(MNT_MTX(mp), MA_OWNED);
1674 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1675 if (should_yield()) {
1677 kern_yield(PRI_UNCHANGED);
1680 vp = TAILQ_NEXT(*mvp, v_nmntvnodes);
1681 while (vp != NULL && vp->v_type == VMARKER)
1682 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1684 /* Check if we are done */
1686 __mnt_vnode_markerfree(mvp, mp);
1689 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1690 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1695 __mnt_vnode_first(struct vnode **mvp, struct mount *mp)
1699 mtx_assert(MNT_MTX(mp), MA_OWNED);
1701 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1702 while (vp != NULL && vp->v_type == VMARKER)
1703 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1705 /* Check if we are done */
1712 *mvp = (struct vnode *) malloc(sizeof(struct vnode),
1716 (*mvp)->v_type = VMARKER;
1718 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1719 while (vp != NULL && vp->v_type == VMARKER)
1720 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1722 /* Check if we are done */
1725 free(*mvp, M_VNODE_MARKER);
1731 (*mvp)->v_mount = mp;
1732 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1738 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp)
1744 mtx_assert(MNT_MTX(mp), MA_OWNED);
1746 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1747 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1749 free(*mvp, M_VNODE_MARKER);
1757 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1761 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1762 if (sbp != &mp->mnt_stat)
1763 *sbp = mp->mnt_stat;
1768 vfs_mountedfrom(struct mount *mp, const char *from)
1771 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1772 strlcpy(mp->mnt_stat.f_mntfromname, from,
1773 sizeof mp->mnt_stat.f_mntfromname);
1777 * ---------------------------------------------------------------------
1778 * This is the api for building mount args and mounting filesystems from
1779 * inside the kernel.
1781 * The API works by accumulation of individual args. First error is
1784 * XXX: should be documented in new manpage kernel_mount(9)
1787 /* A memory allocation which must be freed when we are done */
1789 SLIST_ENTRY(mntaarg) next;
1792 /* The header for the mount arguments */
1797 SLIST_HEAD(, mntaarg) list;
1801 * Add a boolean argument.
1803 * flag is the boolean value.
1804 * name must start with "no".
1807 mount_argb(struct mntarg *ma, int flag, const char *name)
1810 KASSERT(name[0] == 'n' && name[1] == 'o',
1811 ("mount_argb(...,%s): name must start with 'no'", name));
1813 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1817 * Add an argument printf style
1820 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1823 struct mntaarg *maa;
1828 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1829 SLIST_INIT(&ma->list);
1834 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1836 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1837 ma->v[ma->len].iov_len = strlen(name) + 1;
1840 sb = sbuf_new_auto();
1842 sbuf_vprintf(sb, fmt, ap);
1845 len = sbuf_len(sb) + 1;
1846 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1847 SLIST_INSERT_HEAD(&ma->list, maa, next);
1848 bcopy(sbuf_data(sb), maa + 1, len);
1851 ma->v[ma->len].iov_base = maa + 1;
1852 ma->v[ma->len].iov_len = len;
1859 * Add an argument which is a userland string.
1862 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1864 struct mntaarg *maa;
1870 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1871 SLIST_INIT(&ma->list);
1875 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1876 SLIST_INSERT_HEAD(&ma->list, maa, next);
1877 tbuf = (void *)(maa + 1);
1878 ma->error = copyinstr(val, tbuf, len, NULL);
1879 return (mount_arg(ma, name, tbuf, -1));
1885 * If length is -1, treat value as a C string.
1888 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1892 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1893 SLIST_INIT(&ma->list);
1898 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1900 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1901 ma->v[ma->len].iov_len = strlen(name) + 1;
1904 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1906 ma->v[ma->len].iov_len = strlen(val) + 1;
1908 ma->v[ma->len].iov_len = len;
1914 * Free a mntarg structure
1917 free_mntarg(struct mntarg *ma)
1919 struct mntaarg *maa;
1921 while (!SLIST_EMPTY(&ma->list)) {
1922 maa = SLIST_FIRST(&ma->list);
1923 SLIST_REMOVE_HEAD(&ma->list, next);
1926 free(ma->v, M_MOUNT);
1931 * Mount a filesystem
1934 kernel_mount(struct mntarg *ma, uint64_t flags)
1939 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
1940 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
1941 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
1943 auio.uio_iov = ma->v;
1944 auio.uio_iovcnt = ma->len;
1945 auio.uio_segflg = UIO_SYSSPACE;
1949 error = vfs_donmount(curthread, flags, &auio);
1955 * A printflike function to mount a filesystem.
1958 kernel_vmount(int flags, ...)
1960 struct mntarg *ma = NULL;
1966 va_start(ap, flags);
1968 cp = va_arg(ap, const char *);
1971 vp = va_arg(ap, const void *);
1972 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
1976 error = kernel_mount(ma, flags);
1981 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
1984 bcopy(oexp, exp, sizeof(*oexp));
1985 exp->ex_numsecflavors = 0;