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 "opt_vfs_allow_nonmpsafe.h"
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 static uma_zone_t mount_zone;
86 /* List of mounted filesystems. */
87 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
89 /* For any iteration/modification of mountlist */
90 struct mtx mountlist_mtx;
91 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
94 * Global opts, taken by all filesystems
96 static const char *global_opts[] = {
108 mount_init(void *mem, int size, int flags)
112 mp = (struct mount *)mem;
113 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
114 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
119 mount_fini(void *mem, int size)
123 mp = (struct mount *)mem;
124 lockdestroy(&mp->mnt_explock);
125 mtx_destroy(&mp->mnt_mtx);
129 vfs_mount_init(void *dummy __unused)
132 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
133 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
135 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
138 * ---------------------------------------------------------------------
139 * Functions for building and sanitizing the mount options
142 /* Remove one mount option. */
144 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
147 TAILQ_REMOVE(opts, opt, link);
148 free(opt->name, M_MOUNT);
149 if (opt->value != NULL)
150 free(opt->value, M_MOUNT);
154 /* Release all resources related to the mount options. */
156 vfs_freeopts(struct vfsoptlist *opts)
160 while (!TAILQ_EMPTY(opts)) {
161 opt = TAILQ_FIRST(opts);
162 vfs_freeopt(opts, opt);
168 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
170 struct vfsopt *opt, *temp;
174 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
175 if (strcmp(opt->name, name) == 0)
176 vfs_freeopt(opts, opt);
181 vfs_isopt_ro(const char *opt)
184 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
185 strcmp(opt, "norw") == 0)
191 vfs_isopt_rw(const char *opt)
194 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
200 * Check if options are equal (with or without the "no" prefix).
203 vfs_equalopts(const char *opt1, const char *opt2)
207 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
208 if (strcmp(opt1, opt2) == 0)
210 /* "noopt" vs. "opt" */
211 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
213 /* "opt" vs. "noopt" */
214 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
216 while ((p = strchr(opt1, '.')) != NULL &&
217 !strncmp(opt1, opt2, ++p - opt1)) {
220 /* "foo.noopt" vs. "foo.opt" */
221 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
223 /* "foo.opt" vs. "foo.noopt" */
224 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
227 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */
228 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
229 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
235 * If a mount option is specified several times,
236 * (with or without the "no" prefix) only keep
237 * the last occurence of it.
240 vfs_sanitizeopts(struct vfsoptlist *opts)
242 struct vfsopt *opt, *opt2, *tmp;
244 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
245 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
246 while (opt2 != NULL) {
247 if (vfs_equalopts(opt->name, opt2->name)) {
248 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
249 vfs_freeopt(opts, opt2);
252 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
259 * Build a linked list of mount options from a struct uio.
262 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
264 struct vfsoptlist *opts;
266 size_t memused, namelen, optlen;
267 unsigned int i, iovcnt;
270 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
273 iovcnt = auio->uio_iovcnt;
274 for (i = 0; i < iovcnt; i += 2) {
275 namelen = auio->uio_iov[i].iov_len;
276 optlen = auio->uio_iov[i + 1].iov_len;
277 memused += sizeof(struct vfsopt) + optlen + namelen;
279 * Avoid consuming too much memory, and attempts to overflow
282 if (memused > VFS_MOUNTARG_SIZE_MAX ||
283 optlen > VFS_MOUNTARG_SIZE_MAX ||
284 namelen > VFS_MOUNTARG_SIZE_MAX) {
289 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
290 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
297 * Do this early, so jumps to "bad" will free the current
300 TAILQ_INSERT_TAIL(opts, opt, link);
302 if (auio->uio_segflg == UIO_SYSSPACE) {
303 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
305 error = copyin(auio->uio_iov[i].iov_base, opt->name,
310 /* Ensure names are null-terminated strings. */
311 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
317 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
318 if (auio->uio_segflg == UIO_SYSSPACE) {
319 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
322 error = copyin(auio->uio_iov[i + 1].iov_base,
329 vfs_sanitizeopts(opts);
338 * Merge the old mount options with the new ones passed
339 * in the MNT_UPDATE case.
341 * XXX: This function will keep a "nofoo" option in the new
342 * options. E.g, if the option's canonical name is "foo",
343 * "nofoo" ends up in the mount point's active options.
346 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
348 struct vfsopt *opt, *new;
350 TAILQ_FOREACH(opt, oldopts, link) {
351 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
352 new->name = strdup(opt->name, M_MOUNT);
354 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
355 bcopy(opt->value, new->value, opt->len);
359 new->seen = opt->seen;
360 TAILQ_INSERT_HEAD(toopts, new, link);
362 vfs_sanitizeopts(toopts);
366 * Mount a filesystem.
371 struct nmount_args /* {
383 * Mount flags are now 64-bits. On 32-bit archtectures only
384 * 32-bits are passed in, but from here on everything handles
385 * 64-bit flags correctly.
389 AUDIT_ARG_FFLAGS(flags);
390 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
391 uap->iovp, uap->iovcnt, flags);
394 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
395 * userspace to set this flag, but we must filter it out if we want
396 * MNT_UPDATE on the root file system to work.
397 * MNT_ROOTFS should only be set by the kernel when mounting its
400 flags &= ~MNT_ROOTFS;
402 iovcnt = uap->iovcnt;
404 * Check that we have an even number of iovec's
405 * and that we have at least two options.
407 if ((iovcnt & 1) || (iovcnt < 4)) {
408 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
413 error = copyinuio(uap->iovp, iovcnt, &auio);
415 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
419 error = vfs_donmount(td, flags, auio);
426 * ---------------------------------------------------------------------
427 * Various utility functions
431 vfs_ref(struct mount *mp)
434 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
441 vfs_rel(struct mount *mp)
444 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
451 * Allocate and initialize the mount point struct.
454 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
459 mp = uma_zalloc(mount_zone, M_WAITOK);
460 bzero(&mp->mnt_startzero,
461 __rangeof(struct mount, mnt_startzero, mnt_endzero));
462 TAILQ_INIT(&mp->mnt_nvnodelist);
463 mp->mnt_nvnodelistsize = 0;
464 TAILQ_INIT(&mp->mnt_activevnodelist);
465 mp->mnt_activevnodelistsize = 0;
467 (void) vfs_busy(mp, MBF_NOWAIT);
468 mp->mnt_op = vfsp->vfc_vfsops;
470 vfsp->vfc_refcount++; /* XXX Unlocked */
471 mp->mnt_stat.f_type = vfsp->vfc_typenum;
473 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
474 mp->mnt_vnodecovered = vp;
475 mp->mnt_cred = crdup(cred);
476 mp->mnt_stat.f_owner = cred->cr_uid;
477 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
478 mp->mnt_iosize_max = DFLTPHYS;
481 mac_mount_create(cred, mp);
483 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
488 * Destroy the mount struct previously allocated by vfs_mount_alloc().
491 vfs_mount_destroy(struct mount *mp)
495 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
496 if (mp->mnt_kern_flag & MNTK_MWAIT) {
497 mp->mnt_kern_flag &= ~MNTK_MWAIT;
501 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
502 KASSERT(mp->mnt_ref == 0,
503 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
504 __FILE__, __LINE__));
505 if (mp->mnt_writeopcount != 0)
506 panic("vfs_mount_destroy: nonzero writeopcount");
507 if (mp->mnt_secondary_writes != 0)
508 panic("vfs_mount_destroy: nonzero secondary_writes");
509 mp->mnt_vfc->vfc_refcount--;
510 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
513 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
515 panic("unmount: dangling vnode");
517 if (mp->mnt_nvnodelistsize != 0)
518 panic("vfs_mount_destroy: nonzero nvnodelistsize");
519 if (mp->mnt_activevnodelistsize != 0)
520 panic("vfs_mount_destroy: nonzero activevnodelistsize");
521 if (mp->mnt_lockref != 0)
522 panic("vfs_mount_destroy: nonzero lock refcount");
525 mac_mount_destroy(mp);
527 if (mp->mnt_opt != NULL)
528 vfs_freeopts(mp->mnt_opt);
529 crfree(mp->mnt_cred);
530 uma_zfree(mount_zone, mp);
534 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
536 struct vfsoptlist *optlist;
537 struct vfsopt *opt, *tmp_opt;
538 char *fstype, *fspath, *errmsg;
539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
541 errmsg = fspath = NULL;
542 errmsg_len = fspathlen = 0;
545 error = vfs_buildopts(fsoptions, &optlist);
549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
553 * We need these two options before the others,
554 * and they are mandatory for any filesystem.
555 * Ensure they are NUL terminated as well.
558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
559 if (error || fstype[fstypelen - 1] != '\0') {
562 strncpy(errmsg, "Invalid fstype", errmsg_len);
566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
567 if (error || fspath[fspathlen - 1] != '\0') {
570 strncpy(errmsg, "Invalid fspath", errmsg_len);
575 * We need to see if we have the "update" option
576 * before we call vfs_domount(), since vfs_domount() has special
577 * logic based on MNT_UPDATE. This is very important
578 * when we want to update the root filesystem.
580 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
581 if (strcmp(opt->name, "update") == 0) {
582 fsflags |= MNT_UPDATE;
583 vfs_freeopt(optlist, opt);
585 else if (strcmp(opt->name, "async") == 0)
586 fsflags |= MNT_ASYNC;
587 else if (strcmp(opt->name, "force") == 0) {
588 fsflags |= MNT_FORCE;
589 vfs_freeopt(optlist, opt);
591 else if (strcmp(opt->name, "reload") == 0) {
592 fsflags |= MNT_RELOAD;
593 vfs_freeopt(optlist, opt);
595 else if (strcmp(opt->name, "multilabel") == 0)
596 fsflags |= MNT_MULTILABEL;
597 else if (strcmp(opt->name, "noasync") == 0)
598 fsflags &= ~MNT_ASYNC;
599 else if (strcmp(opt->name, "noatime") == 0)
600 fsflags |= MNT_NOATIME;
601 else if (strcmp(opt->name, "atime") == 0) {
602 free(opt->name, M_MOUNT);
603 opt->name = strdup("nonoatime", M_MOUNT);
605 else if (strcmp(opt->name, "noclusterr") == 0)
606 fsflags |= MNT_NOCLUSTERR;
607 else if (strcmp(opt->name, "clusterr") == 0) {
608 free(opt->name, M_MOUNT);
609 opt->name = strdup("nonoclusterr", M_MOUNT);
611 else if (strcmp(opt->name, "noclusterw") == 0)
612 fsflags |= MNT_NOCLUSTERW;
613 else if (strcmp(opt->name, "clusterw") == 0) {
614 free(opt->name, M_MOUNT);
615 opt->name = strdup("nonoclusterw", M_MOUNT);
617 else if (strcmp(opt->name, "noexec") == 0)
618 fsflags |= MNT_NOEXEC;
619 else if (strcmp(opt->name, "exec") == 0) {
620 free(opt->name, M_MOUNT);
621 opt->name = strdup("nonoexec", M_MOUNT);
623 else if (strcmp(opt->name, "nosuid") == 0)
624 fsflags |= MNT_NOSUID;
625 else if (strcmp(opt->name, "suid") == 0) {
626 free(opt->name, M_MOUNT);
627 opt->name = strdup("nonosuid", M_MOUNT);
629 else if (strcmp(opt->name, "nosymfollow") == 0)
630 fsflags |= MNT_NOSYMFOLLOW;
631 else if (strcmp(opt->name, "symfollow") == 0) {
632 free(opt->name, M_MOUNT);
633 opt->name = strdup("nonosymfollow", M_MOUNT);
635 else if (strcmp(opt->name, "noro") == 0)
636 fsflags &= ~MNT_RDONLY;
637 else if (strcmp(opt->name, "rw") == 0)
638 fsflags &= ~MNT_RDONLY;
639 else if (strcmp(opt->name, "ro") == 0)
640 fsflags |= MNT_RDONLY;
641 else if (strcmp(opt->name, "rdonly") == 0) {
642 free(opt->name, M_MOUNT);
643 opt->name = strdup("ro", M_MOUNT);
644 fsflags |= MNT_RDONLY;
646 else if (strcmp(opt->name, "suiddir") == 0)
647 fsflags |= MNT_SUIDDIR;
648 else if (strcmp(opt->name, "sync") == 0)
649 fsflags |= MNT_SYNCHRONOUS;
650 else if (strcmp(opt->name, "union") == 0)
651 fsflags |= MNT_UNION;
655 * Be ultra-paranoid about making sure the type and fspath
656 * variables will fit in our mp buffers, including the
659 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
660 error = ENAMETOOLONG;
664 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
666 /* copyout the errmsg */
667 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
668 && errmsg_len > 0 && errmsg != NULL) {
669 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
681 vfs_freeopts(optlist);
688 #ifndef _SYS_SYSPROTO_H_
700 struct mount_args /* {
708 struct vfsconf *vfsp = NULL;
709 struct mntarg *ma = NULL;
714 * Mount flags are now 64-bits. On 32-bit archtectures only
715 * 32-bits are passed in, but from here on everything handles
716 * 64-bit flags correctly.
720 AUDIT_ARG_FFLAGS(flags);
723 * Filter out MNT_ROOTFS. We do not want clients of mount() in
724 * userspace to set this flag, but we must filter it out if we want
725 * MNT_UPDATE on the root file system to work.
726 * MNT_ROOTFS should only be set by the kernel when mounting its
729 flags &= ~MNT_ROOTFS;
731 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
732 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
734 free(fstype, M_TEMP);
738 AUDIT_ARG_TEXT(fstype);
740 vfsp = vfs_byname_kld(fstype, td, &error);
741 free(fstype, M_TEMP);
746 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
751 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN);
752 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
753 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
754 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
755 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
757 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
763 * vfs_domount_first(): first file system mount (not update)
767 struct thread *td, /* Calling thread. */
768 struct vfsconf *vfsp, /* File system type. */
769 char *fspath, /* Mount path. */
770 struct vnode *vp, /* Vnode to be covered. */
771 uint64_t fsflags, /* Flags common to all filesystems. */
772 struct vfsoptlist **optlist /* Options local to the filesystem. */
780 mtx_assert(&Giant, MA_OWNED);
781 ASSERT_VOP_ELOCKED(vp, __func__);
782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
785 * If the user is not root, ensure that they own the directory
786 * onto which we are attempting to mount.
788 error = VOP_GETATTR(vp, &va, td->td_ucred);
789 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
790 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
792 error = vinvalbuf(vp, V_SAVE, 0, 0);
793 if (error == 0 && vp->v_type != VDIR)
797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
798 vp->v_iflag |= VI_MOUNT;
809 /* Allocate and initialize the filesystem. */
810 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
811 /* XXXMAC: pass to vfs_mount_alloc? */
812 mp->mnt_optnew = *optlist;
813 /* Set the mount level flags. */
814 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
817 * Mount the filesystem.
818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
819 * get. No freeing of cn_pnbuf.
821 error = VFS_MOUNT(mp);
822 #ifndef VFS_ALLOW_NONMPSAFE
823 if (error == 0 && VFS_NEEDSGIANT(mp)) {
824 (void)VFS_UNMOUNT(mp, fsflags);
826 printf("%s: Mounting non-MPSAFE fs (%s) is disabled\n",
827 __func__, mp->mnt_vfc->vfc_name);
832 vfs_mount_destroy(mp);
834 vp->v_iflag &= ~VI_MOUNT;
839 #ifdef VFS_ALLOW_NONMPSAFE
840 if (VFS_NEEDSGIANT(mp))
841 printf("%s: Mounting non-MPSAFE fs (%s) is deprecated\n",
842 __func__, mp->mnt_vfc->vfc_name);
845 if (mp->mnt_opt != NULL)
846 vfs_freeopts(mp->mnt_opt);
847 mp->mnt_opt = mp->mnt_optnew;
849 (void)VFS_STATFS(mp, &mp->mnt_stat);
852 * Prevent external consumers of mount options from reading mnt_optnew.
854 mp->mnt_optnew = NULL;
857 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
858 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
859 mp->mnt_kern_flag |= MNTK_ASYNC;
861 mp->mnt_kern_flag &= ~MNTK_ASYNC;
864 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
867 vp->v_iflag &= ~VI_MOUNT;
869 vp->v_mountedhere = mp;
870 /* Place the new filesystem at the end of the mount list. */
871 mtx_lock(&mountlist_mtx);
872 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
873 mtx_unlock(&mountlist_mtx);
874 vfs_event_signal(NULL, VQ_MOUNT, 0);
875 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
876 panic("mount: lost mount");
877 VOP_UNLOCK(newdp, 0);
879 mountcheckdirs(vp, newdp);
881 if ((mp->mnt_flag & MNT_RDONLY) == 0)
882 vfs_allocate_syncvnode(mp);
888 * vfs_domount_update(): update of mounted file system
892 struct thread *td, /* Calling thread. */
893 struct vnode *vp, /* Mount point vnode. */
894 uint64_t fsflags, /* Flags common to all filesystems. */
895 struct vfsoptlist **optlist /* Options local to the filesystem. */
898 struct oexport_args oexport;
899 struct export_args export;
901 int error, export_error;
904 mtx_assert(&Giant, MA_OWNED);
905 ASSERT_VOP_ELOCKED(vp, __func__);
906 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
908 if ((vp->v_vflag & VV_ROOT) == 0) {
914 * We only allow the filesystem to be reloaded if it
915 * is currently mounted read-only.
918 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
920 return (EOPNOTSUPP); /* Needs translation */
923 * Only privileged root, or (if MNT_USER is set) the user that
924 * did the original mount is permitted to update it.
926 error = vfs_suser(mp, td);
931 if (vfs_busy(mp, MBF_NOWAIT)) {
936 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
942 vp->v_iflag |= VI_MOUNT;
947 mp->mnt_flag &= ~MNT_UPDATEMASK;
948 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
949 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
950 if ((mp->mnt_flag & MNT_ASYNC) == 0)
951 mp->mnt_kern_flag &= ~MNTK_ASYNC;
953 mp->mnt_optnew = *optlist;
954 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
957 * Mount the filesystem.
958 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
959 * get. No freeing of cn_pnbuf.
961 error = VFS_MOUNT(mp);
965 /* Process the export option. */
966 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
967 sizeof(export)) == 0) {
968 export_error = vfs_export(mp, &export);
969 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
970 sizeof(oexport)) == 0) {
971 export.ex_flags = oexport.ex_flags;
972 export.ex_root = oexport.ex_root;
973 export.ex_anon = oexport.ex_anon;
974 export.ex_addr = oexport.ex_addr;
975 export.ex_addrlen = oexport.ex_addrlen;
976 export.ex_mask = oexport.ex_mask;
977 export.ex_masklen = oexport.ex_masklen;
978 export.ex_indexfile = oexport.ex_indexfile;
979 export.ex_numsecflavors = 0;
980 export_error = vfs_export(mp, &export);
986 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
990 * If we fail, restore old mount flags. MNT_QUOTA is special,
991 * because it is not part of MNT_UPDATEMASK, but it could have
992 * changed in the meantime if quotactl(2) was called.
993 * All in all we want current value of MNT_QUOTA, not the old
996 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
998 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
999 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1000 mp->mnt_kern_flag |= MNTK_ASYNC;
1002 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1008 if (mp->mnt_opt != NULL)
1009 vfs_freeopts(mp->mnt_opt);
1010 mp->mnt_opt = mp->mnt_optnew;
1012 (void)VFS_STATFS(mp, &mp->mnt_stat);
1014 * Prevent external consumers of mount options from reading
1017 mp->mnt_optnew = NULL;
1019 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1020 vfs_allocate_syncvnode(mp);
1022 vfs_deallocate_syncvnode(mp);
1026 vp->v_iflag &= ~VI_MOUNT;
1029 return (error != 0 ? error : export_error);
1033 * vfs_domount(): actually attempt a filesystem mount.
1037 struct thread *td, /* Calling thread. */
1038 const char *fstype, /* Filesystem type. */
1039 char *fspath, /* Mount path. */
1040 uint64_t fsflags, /* Flags common to all filesystems. */
1041 struct vfsoptlist **optlist /* Options local to the filesystem. */
1044 struct vfsconf *vfsp;
1045 struct nameidata nd;
1051 * Be ultra-paranoid about making sure the type and fspath
1052 * variables will fit in our mp buffers, including the
1055 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1056 return (ENAMETOOLONG);
1058 if (jailed(td->td_ucred) || usermount == 0) {
1059 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1064 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1066 if (fsflags & MNT_EXPORTED) {
1067 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1071 if (fsflags & MNT_SUIDDIR) {
1072 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1077 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1079 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1080 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1081 fsflags |= MNT_NOSUID | MNT_USER;
1084 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1086 if ((fsflags & MNT_UPDATE) == 0) {
1087 /* Don't try to load KLDs if we're mounting the root. */
1088 if (fsflags & MNT_ROOTFS)
1089 vfsp = vfs_byname(fstype);
1091 vfsp = vfs_byname_kld(fstype, td, &error);
1094 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1099 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1101 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1102 UIO_SYSSPACE, fspath, td);
1106 if (!NDHASGIANT(&nd))
1108 NDFREE(&nd, NDF_ONLY_PNBUF);
1110 if ((fsflags & MNT_UPDATE) == 0) {
1111 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1112 strcpy(pathbuf, fspath);
1113 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1114 /* debug.disablefullpath == 1 results in ENODEV */
1115 if (error == 0 || error == ENODEV) {
1116 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1119 free(pathbuf, M_TEMP);
1121 error = vfs_domount_update(td, vp, fsflags, optlist);
1124 ASSERT_VI_UNLOCKED(vp, __func__);
1125 ASSERT_VOP_UNLOCKED(vp, __func__);
1131 * Unmount a filesystem.
1133 * Note: unmount takes a path to the vnode mounted on as argument, not
1134 * special file (as before).
1136 #ifndef _SYS_SYSPROTO_H_
1137 struct unmount_args {
1144 sys_unmount(td, uap)
1146 register struct unmount_args /* {
1151 struct nameidata nd;
1154 int error, id0, id1, vfslocked;
1156 AUDIT_ARG_VALUE(uap->flags);
1157 if (jailed(td->td_ucred) || usermount == 0) {
1158 error = priv_check(td, PRIV_VFS_UNMOUNT);
1163 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1164 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1166 free(pathbuf, M_TEMP);
1170 if (uap->flags & MNT_BYFSID) {
1171 AUDIT_ARG_TEXT(pathbuf);
1172 /* Decode the filesystem ID. */
1173 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1175 free(pathbuf, M_TEMP);
1179 mtx_lock(&mountlist_mtx);
1180 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1181 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1182 mp->mnt_stat.f_fsid.val[1] == id1)
1185 mtx_unlock(&mountlist_mtx);
1187 AUDIT_ARG_UPATH1(td, pathbuf);
1189 * Try to find global path for path argument.
1192 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
1193 UIO_SYSSPACE, pathbuf, td);
1194 if (namei(&nd) == 0) {
1195 vfslocked = NDHASGIANT(&nd);
1196 NDFREE(&nd, NDF_ONLY_PNBUF);
1197 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1199 if (error == 0 || error == ENODEV)
1201 VFS_UNLOCK_GIANT(vfslocked);
1203 mtx_lock(&mountlist_mtx);
1204 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1205 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1208 mtx_unlock(&mountlist_mtx);
1210 free(pathbuf, M_TEMP);
1213 * Previously we returned ENOENT for a nonexistent path and
1214 * EINVAL for a non-mountpoint. We cannot tell these apart
1215 * now, so in the !MNT_BYFSID case return the more likely
1216 * EINVAL for compatibility.
1219 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1223 * Don't allow unmounting the root filesystem.
1225 if (mp->mnt_flag & MNT_ROOTFS) {
1229 error = dounmount(mp, uap->flags, td);
1235 * Do the actual filesystem unmount.
1238 dounmount(mp, flags, td)
1243 struct vnode *coveredvp, *fsrootvp;
1245 uint64_t async_flag;
1248 mtx_assert(&Giant, MA_OWNED);
1250 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1251 mnt_gen_r = mp->mnt_gen;
1254 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1257 * Check for mp being unmounted while waiting for the
1258 * covered vnode lock.
1260 if (coveredvp->v_mountedhere != mp ||
1261 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1262 VOP_UNLOCK(coveredvp, 0);
1267 * Only privileged root, or (if MNT_USER is set) the user that did the
1268 * original mount is permitted to unmount this filesystem.
1270 error = vfs_suser(mp, td);
1273 VOP_UNLOCK(coveredvp, 0);
1278 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
1281 VOP_UNLOCK(coveredvp, 0);
1284 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1285 /* Allow filesystems to detect that a forced unmount is in progress. */
1286 if (flags & MNT_FORCE)
1287 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1289 if (mp->mnt_lockref) {
1290 mp->mnt_kern_flag |= MNTK_DRAINING;
1291 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1295 KASSERT(mp->mnt_lockref == 0,
1296 ("%s: invalid lock refcount in the drain path @ %s:%d",
1297 __func__, __FILE__, __LINE__));
1299 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1300 __func__, __FILE__, __LINE__));
1301 vn_start_write(NULL, &mp, V_WAIT);
1303 if (mp->mnt_flag & MNT_EXPUBLIC)
1304 vfs_setpublicfs(NULL, NULL, NULL);
1306 vfs_msync(mp, MNT_WAIT);
1308 async_flag = mp->mnt_flag & MNT_ASYNC;
1309 mp->mnt_flag &= ~MNT_ASYNC;
1310 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1312 cache_purgevfs(mp); /* remove cache entries for this file sys */
1313 vfs_deallocate_syncvnode(mp);
1315 * For forced unmounts, move process cdir/rdir refs on the fs root
1316 * vnode to the covered vnode. For non-forced unmounts we want
1317 * such references to cause an EBUSY error.
1319 if ((flags & MNT_FORCE) &&
1320 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1321 if (mp->mnt_vnodecovered != NULL)
1322 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1323 if (fsrootvp == rootvnode) {
1329 if (((mp->mnt_flag & MNT_RDONLY) ||
1330 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0)
1331 error = VFS_UNMOUNT(mp, flags);
1332 vn_finished_write(mp);
1334 * If we failed to flush the dirty blocks for this mount point,
1335 * undo all the cdir/rdir and rootvnode changes we made above.
1336 * Unless we failed to do so because the device is reporting that
1337 * it doesn't exist anymore.
1339 if (error && error != ENXIO) {
1340 if ((flags & MNT_FORCE) &&
1341 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1342 if (mp->mnt_vnodecovered != NULL)
1343 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1344 if (rootvnode == NULL) {
1345 rootvnode = fsrootvp;
1351 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1352 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1354 vfs_allocate_syncvnode(mp);
1357 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1358 mp->mnt_flag |= async_flag;
1359 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1360 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1361 mp->mnt_kern_flag |= MNTK_ASYNC;
1362 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1363 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1368 VOP_UNLOCK(coveredvp, 0);
1371 mtx_lock(&mountlist_mtx);
1372 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1373 mtx_unlock(&mountlist_mtx);
1374 if (coveredvp != NULL) {
1375 coveredvp->v_mountedhere = NULL;
1378 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1379 vfs_mount_destroy(mp);
1384 * Report errors during filesystem mounting.
1387 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1389 struct vfsoptlist *moptlist = mp->mnt_optnew;
1394 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1395 if (error || errmsg == NULL || len <= 0)
1399 vsnprintf(errmsg, (size_t)len, fmt, ap);
1404 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1410 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1411 if (error || errmsg == NULL || len <= 0)
1415 vsnprintf(errmsg, (size_t)len, fmt, ap);
1420 * ---------------------------------------------------------------------
1421 * Functions for querying mount options/arguments from filesystems.
1425 * Check that no unknown options are given
1428 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1432 const char **t, *p, *q;
1435 TAILQ_FOREACH(opt, opts, link) {
1438 if (p[0] == 'n' && p[1] == 'o')
1440 for(t = global_opts; *t != NULL; t++) {
1441 if (strcmp(*t, p) == 0)
1444 if (strcmp(*t, q) == 0)
1450 for(t = legal; *t != NULL; t++) {
1451 if (strcmp(*t, p) == 0)
1454 if (strcmp(*t, q) == 0)
1460 snprintf(errmsg, sizeof(errmsg),
1461 "mount option <%s> is unknown", p);
1465 TAILQ_FOREACH(opt, opts, link) {
1466 if (strcmp(opt->name, "errmsg") == 0) {
1467 strncpy((char *)opt->value, errmsg, opt->len);
1472 printf("%s\n", errmsg);
1478 * Get a mount option by its name.
1480 * Return 0 if the option was found, ENOENT otherwise.
1481 * If len is non-NULL it will be filled with the length
1482 * of the option. If buf is non-NULL, it will be filled
1483 * with the address of the option.
1486 vfs_getopt(opts, name, buf, len)
1487 struct vfsoptlist *opts;
1494 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1496 TAILQ_FOREACH(opt, opts, link) {
1497 if (strcmp(name, opt->name) == 0) {
1510 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1517 TAILQ_FOREACH(opt, opts, link) {
1518 if (strcmp(name, opt->name) == 0) {
1527 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1529 char *opt_value, *vtp;
1533 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1536 if (opt_len == 0 || opt_value == NULL)
1538 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1540 iv = strtoq(opt_value, &vtp, 0);
1541 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1569 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1574 TAILQ_FOREACH(opt, opts, link) {
1575 if (strcmp(name, opt->name) != 0)
1578 if (opt->len == 0 ||
1579 ((char *)opt->value)[opt->len - 1] != '\0') {
1583 return (opt->value);
1590 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1595 TAILQ_FOREACH(opt, opts, link) {
1596 if (strcmp(name, opt->name) == 0) {
1609 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1615 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1617 TAILQ_FOREACH(opt, opts, link) {
1618 if (strcmp(name, opt->name) != 0)
1621 if (opt->len == 0 || opt->value == NULL)
1623 if (((char *)opt->value)[opt->len - 1] != '\0')
1626 ret = vsscanf(opt->value, fmt, ap);
1634 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1638 TAILQ_FOREACH(opt, opts, link) {
1639 if (strcmp(name, opt->name) != 0)
1642 if (opt->value == NULL)
1645 if (opt->len != len)
1647 bcopy(value, opt->value, len);
1655 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1659 TAILQ_FOREACH(opt, opts, link) {
1660 if (strcmp(name, opt->name) != 0)
1663 if (opt->value == NULL)
1669 bcopy(value, opt->value, len);
1677 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1681 TAILQ_FOREACH(opt, opts, link) {
1682 if (strcmp(name, opt->name) != 0)
1685 if (opt->value == NULL)
1686 opt->len = strlen(value) + 1;
1687 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1695 * Find and copy a mount option.
1697 * The size of the buffer has to be specified
1698 * in len, if it is not the same length as the
1699 * mount option, EINVAL is returned.
1700 * Returns ENOENT if the option is not found.
1703 vfs_copyopt(opts, name, dest, len)
1704 struct vfsoptlist *opts;
1711 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1713 TAILQ_FOREACH(opt, opts, link) {
1714 if (strcmp(name, opt->name) == 0) {
1716 if (len != opt->len)
1718 bcopy(opt->value, dest, opt->len);
1726 * These are helper functions for filesystems to traverse all
1727 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h.
1729 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL.
1732 MALLOC_DECLARE(M_VNODE_MARKER);
1735 __mnt_vnode_next(struct vnode **mvp, struct mount *mp)
1739 mtx_assert(MNT_MTX(mp), MA_OWNED);
1741 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1742 if (should_yield()) {
1744 kern_yield(PRI_UNCHANGED);
1747 vp = TAILQ_NEXT(*mvp, v_nmntvnodes);
1748 while (vp != NULL && vp->v_type == VMARKER)
1749 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1751 /* Check if we are done */
1753 __mnt_vnode_markerfree(mvp, mp);
1756 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1757 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1762 __mnt_vnode_first(struct vnode **mvp, struct mount *mp)
1766 mtx_assert(MNT_MTX(mp), MA_OWNED);
1768 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1769 while (vp != NULL && vp->v_type == VMARKER)
1770 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1772 /* Check if we are done */
1779 *mvp = (struct vnode *) malloc(sizeof(struct vnode),
1783 (*mvp)->v_type = VMARKER;
1785 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1786 while (vp != NULL && vp->v_type == VMARKER)
1787 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1789 /* Check if we are done */
1792 free(*mvp, M_VNODE_MARKER);
1798 (*mvp)->v_mount = mp;
1799 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1805 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp)
1811 mtx_assert(MNT_MTX(mp), MA_OWNED);
1813 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1814 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1816 free(*mvp, M_VNODE_MARKER);
1823 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1827 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1828 if (sbp != &mp->mnt_stat)
1829 *sbp = mp->mnt_stat;
1834 vfs_mountedfrom(struct mount *mp, const char *from)
1837 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1838 strlcpy(mp->mnt_stat.f_mntfromname, from,
1839 sizeof mp->mnt_stat.f_mntfromname);
1843 * ---------------------------------------------------------------------
1844 * This is the api for building mount args and mounting filesystems from
1845 * inside the kernel.
1847 * The API works by accumulation of individual args. First error is
1850 * XXX: should be documented in new manpage kernel_mount(9)
1853 /* A memory allocation which must be freed when we are done */
1855 SLIST_ENTRY(mntaarg) next;
1858 /* The header for the mount arguments */
1863 SLIST_HEAD(, mntaarg) list;
1867 * Add a boolean argument.
1869 * flag is the boolean value.
1870 * name must start with "no".
1873 mount_argb(struct mntarg *ma, int flag, const char *name)
1876 KASSERT(name[0] == 'n' && name[1] == 'o',
1877 ("mount_argb(...,%s): name must start with 'no'", name));
1879 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1883 * Add an argument printf style
1886 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1889 struct mntaarg *maa;
1894 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1895 SLIST_INIT(&ma->list);
1900 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1902 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1903 ma->v[ma->len].iov_len = strlen(name) + 1;
1906 sb = sbuf_new_auto();
1908 sbuf_vprintf(sb, fmt, ap);
1911 len = sbuf_len(sb) + 1;
1912 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1913 SLIST_INSERT_HEAD(&ma->list, maa, next);
1914 bcopy(sbuf_data(sb), maa + 1, len);
1917 ma->v[ma->len].iov_base = maa + 1;
1918 ma->v[ma->len].iov_len = len;
1925 * Add an argument which is a userland string.
1928 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1930 struct mntaarg *maa;
1936 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1937 SLIST_INIT(&ma->list);
1941 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1942 SLIST_INSERT_HEAD(&ma->list, maa, next);
1943 tbuf = (void *)(maa + 1);
1944 ma->error = copyinstr(val, tbuf, len, NULL);
1945 return (mount_arg(ma, name, tbuf, -1));
1951 * If length is -1, treat value as a C string.
1954 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1958 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1959 SLIST_INIT(&ma->list);
1964 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1966 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1967 ma->v[ma->len].iov_len = strlen(name) + 1;
1970 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1972 ma->v[ma->len].iov_len = strlen(val) + 1;
1974 ma->v[ma->len].iov_len = len;
1980 * Free a mntarg structure
1983 free_mntarg(struct mntarg *ma)
1985 struct mntaarg *maa;
1987 while (!SLIST_EMPTY(&ma->list)) {
1988 maa = SLIST_FIRST(&ma->list);
1989 SLIST_REMOVE_HEAD(&ma->list, next);
1992 free(ma->v, M_MOUNT);
1997 * Mount a filesystem
2000 kernel_mount(struct mntarg *ma, uint64_t flags)
2005 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
2006 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
2007 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
2009 auio.uio_iov = ma->v;
2010 auio.uio_iovcnt = ma->len;
2011 auio.uio_segflg = UIO_SYSSPACE;
2015 error = vfs_donmount(curthread, flags, &auio);
2021 * A printflike function to mount a filesystem.
2024 kernel_vmount(int flags, ...)
2026 struct mntarg *ma = NULL;
2032 va_start(ap, flags);
2034 cp = va_arg(ap, const char *);
2037 vp = va_arg(ap, const void *);
2038 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
2042 error = kernel_mount(ma, flags);
2047 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
2050 bcopy(oexp, exp, sizeof(*oexp));
2051 exp->ex_numsecflavors = 0;