2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1999-2004 Poul-Henning Kamp
5 * Copyright (c) 1999 Michael Smith
6 * Copyright (c) 1989, 1993
7 * The Regents of the University of California. All rights reserved.
8 * (c) UNIX System Laboratories, Inc.
9 * All or some portions of this file are derived from material licensed
10 * to the University of California by American Telephone and Telegraph
11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
12 * the permission of UNIX System Laboratories, Inc.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
45 #include <sys/eventhandler.h>
46 #include <sys/fcntl.h>
48 #include <sys/kernel.h>
50 #include <sys/libkern.h>
51 #include <sys/malloc.h>
52 #include <sys/mount.h>
53 #include <sys/mutex.h>
54 #include <sys/namei.h>
57 #include <sys/filedesc.h>
58 #include <sys/reboot.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysproto.h>
63 #include <sys/sysctl.h>
64 #include <sys/sysent.h>
65 #include <sys/systm.h>
66 #include <sys/vnode.h>
69 #include <geom/geom.h>
71 #include <machine/stdarg.h>
73 #include <security/audit/audit.h>
74 #include <security/mac/mac_framework.h>
76 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
78 static int vfs_domount(struct thread *td, const char *fstype, char *fspath,
79 uint64_t fsflags, struct vfsoptlist **optlist);
80 static void free_mntarg(struct mntarg *ma);
82 static int usermount = 0;
83 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0,
84 "Unprivileged users may mount and unmount file systems");
86 static bool default_autoro = false;
87 SYSCTL_BOOL(_vfs, OID_AUTO, default_autoro, CTLFLAG_RW, &default_autoro, 0,
88 "Retry failed r/w mount as r/o if no explicit ro/rw option is specified");
90 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
91 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure");
92 static uma_zone_t mount_zone;
94 /* List of mounted filesystems. */
95 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
97 /* For any iteration/modification of mountlist */
98 struct mtx mountlist_mtx;
99 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
101 EVENTHANDLER_LIST_DEFINE(vfs_mounted);
102 EVENTHANDLER_LIST_DEFINE(vfs_unmounted);
105 * Global opts, taken by all filesystems
107 static const char *global_opts[] = {
119 mount_init(void *mem, int size, int flags)
123 mp = (struct mount *)mem;
124 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
125 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF);
126 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
127 mp->mnt_thread_in_ops_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
129 mp->mnt_ref_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
131 mp->mnt_lockref_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
133 mp->mnt_writeopcount_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
137 mp->mnt_rootvnode = NULL;
142 mount_fini(void *mem, int size)
146 mp = (struct mount *)mem;
147 uma_zfree_pcpu(pcpu_zone_int, mp->mnt_writeopcount_pcpu);
148 uma_zfree_pcpu(pcpu_zone_int, mp->mnt_lockref_pcpu);
149 uma_zfree_pcpu(pcpu_zone_int, mp->mnt_ref_pcpu);
150 uma_zfree_pcpu(pcpu_zone_int, mp->mnt_thread_in_ops_pcpu);
151 lockdestroy(&mp->mnt_explock);
152 mtx_destroy(&mp->mnt_listmtx);
153 mtx_destroy(&mp->mnt_mtx);
157 vfs_mount_init(void *dummy __unused)
160 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
161 NULL, mount_init, mount_fini, UMA_ALIGN_CACHE, UMA_ZONE_NOFREE);
163 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
166 * ---------------------------------------------------------------------
167 * Functions for building and sanitizing the mount options
170 /* Remove one mount option. */
172 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
175 TAILQ_REMOVE(opts, opt, link);
176 free(opt->name, M_MOUNT);
177 if (opt->value != NULL)
178 free(opt->value, M_MOUNT);
182 /* Release all resources related to the mount options. */
184 vfs_freeopts(struct vfsoptlist *opts)
188 while (!TAILQ_EMPTY(opts)) {
189 opt = TAILQ_FIRST(opts);
190 vfs_freeopt(opts, opt);
196 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
198 struct vfsopt *opt, *temp;
202 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
203 if (strcmp(opt->name, name) == 0)
204 vfs_freeopt(opts, opt);
209 vfs_isopt_ro(const char *opt)
212 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
213 strcmp(opt, "norw") == 0)
219 vfs_isopt_rw(const char *opt)
222 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
228 * Check if options are equal (with or without the "no" prefix).
231 vfs_equalopts(const char *opt1, const char *opt2)
235 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
236 if (strcmp(opt1, opt2) == 0)
238 /* "noopt" vs. "opt" */
239 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
241 /* "opt" vs. "noopt" */
242 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
244 while ((p = strchr(opt1, '.')) != NULL &&
245 !strncmp(opt1, opt2, ++p - opt1)) {
248 /* "foo.noopt" vs. "foo.opt" */
249 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
251 /* "foo.opt" vs. "foo.noopt" */
252 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
255 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */
256 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
257 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
263 * If a mount option is specified several times,
264 * (with or without the "no" prefix) only keep
265 * the last occurrence of it.
268 vfs_sanitizeopts(struct vfsoptlist *opts)
270 struct vfsopt *opt, *opt2, *tmp;
272 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
273 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
274 while (opt2 != NULL) {
275 if (vfs_equalopts(opt->name, opt2->name)) {
276 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
277 vfs_freeopt(opts, opt2);
280 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
287 * Build a linked list of mount options from a struct uio.
290 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
292 struct vfsoptlist *opts;
294 size_t memused, namelen, optlen;
295 unsigned int i, iovcnt;
298 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
301 iovcnt = auio->uio_iovcnt;
302 for (i = 0; i < iovcnt; i += 2) {
303 namelen = auio->uio_iov[i].iov_len;
304 optlen = auio->uio_iov[i + 1].iov_len;
305 memused += sizeof(struct vfsopt) + optlen + namelen;
307 * Avoid consuming too much memory, and attempts to overflow
310 if (memused > VFS_MOUNTARG_SIZE_MAX ||
311 optlen > VFS_MOUNTARG_SIZE_MAX ||
312 namelen > VFS_MOUNTARG_SIZE_MAX) {
317 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
318 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
325 * Do this early, so jumps to "bad" will free the current
328 TAILQ_INSERT_TAIL(opts, opt, link);
330 if (auio->uio_segflg == UIO_SYSSPACE) {
331 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
333 error = copyin(auio->uio_iov[i].iov_base, opt->name,
338 /* Ensure names are null-terminated strings. */
339 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
345 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
346 if (auio->uio_segflg == UIO_SYSSPACE) {
347 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
350 error = copyin(auio->uio_iov[i + 1].iov_base,
357 vfs_sanitizeopts(opts);
366 * Merge the old mount options with the new ones passed
367 * in the MNT_UPDATE case.
369 * XXX: This function will keep a "nofoo" option in the new
370 * options. E.g, if the option's canonical name is "foo",
371 * "nofoo" ends up in the mount point's active options.
374 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
376 struct vfsopt *opt, *new;
378 TAILQ_FOREACH(opt, oldopts, link) {
379 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
380 new->name = strdup(opt->name, M_MOUNT);
382 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
383 bcopy(opt->value, new->value, opt->len);
387 new->seen = opt->seen;
388 TAILQ_INSERT_HEAD(toopts, new, link);
390 vfs_sanitizeopts(toopts);
394 * Mount a filesystem.
396 #ifndef _SYS_SYSPROTO_H_
404 sys_nmount(struct thread *td, struct nmount_args *uap)
412 * Mount flags are now 64-bits. On 32-bit archtectures only
413 * 32-bits are passed in, but from here on everything handles
414 * 64-bit flags correctly.
418 AUDIT_ARG_FFLAGS(flags);
419 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
420 uap->iovp, uap->iovcnt, flags);
423 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
424 * userspace to set this flag, but we must filter it out if we want
425 * MNT_UPDATE on the root file system to work.
426 * MNT_ROOTFS should only be set by the kernel when mounting its
429 flags &= ~MNT_ROOTFS;
431 iovcnt = uap->iovcnt;
433 * Check that we have an even number of iovec's
434 * and that we have at least two options.
436 if ((iovcnt & 1) || (iovcnt < 4)) {
437 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
442 error = copyinuio(uap->iovp, iovcnt, &auio);
444 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
448 error = vfs_donmount(td, flags, auio);
455 * ---------------------------------------------------------------------
456 * Various utility functions
460 vfs_ref(struct mount *mp)
463 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
464 if (vfs_op_thread_enter(mp)) {
465 vfs_mp_count_add_pcpu(mp, ref, 1);
466 vfs_op_thread_exit(mp);
476 vfs_rel(struct mount *mp)
479 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
480 if (vfs_op_thread_enter(mp)) {
481 vfs_mp_count_sub_pcpu(mp, ref, 1);
482 vfs_op_thread_exit(mp);
492 * Allocate and initialize the mount point struct.
495 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
500 mp = uma_zalloc(mount_zone, M_WAITOK);
501 bzero(&mp->mnt_startzero,
502 __rangeof(struct mount, mnt_startzero, mnt_endzero));
503 TAILQ_INIT(&mp->mnt_nvnodelist);
504 mp->mnt_nvnodelistsize = 0;
505 TAILQ_INIT(&mp->mnt_lazyvnodelist);
506 mp->mnt_lazyvnodelistsize = 0;
507 if (mp->mnt_ref != 0 || mp->mnt_lockref != 0 ||
508 mp->mnt_writeopcount != 0)
509 panic("%s: non-zero counters on new mp %p\n", __func__, mp);
510 if (mp->mnt_vfs_ops != 1)
511 panic("%s: vfs_ops should be 1 but %d found\n", __func__,
513 (void) vfs_busy(mp, MBF_NOWAIT);
514 atomic_add_acq_int(&vfsp->vfc_refcount, 1);
515 mp->mnt_op = vfsp->vfc_vfsops;
517 mp->mnt_stat.f_type = vfsp->vfc_typenum;
519 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
520 mp->mnt_vnodecovered = vp;
521 mp->mnt_cred = crdup(cred);
522 mp->mnt_stat.f_owner = cred->cr_uid;
523 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
524 mp->mnt_iosize_max = DFLTPHYS;
527 mac_mount_create(cred, mp);
529 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
530 TAILQ_INIT(&mp->mnt_uppers);
535 * Destroy the mount struct previously allocated by vfs_mount_alloc().
538 vfs_mount_destroy(struct mount *mp)
541 if (mp->mnt_vfs_ops == 0)
542 panic("%s: entered with zero vfs_ops\n", __func__);
544 vfs_assert_mount_counters(mp);
547 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
548 if (mp->mnt_kern_flag & MNTK_MWAIT) {
549 mp->mnt_kern_flag &= ~MNTK_MWAIT;
553 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
554 KASSERT(mp->mnt_ref == 0,
555 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
556 __FILE__, __LINE__));
557 if (mp->mnt_writeopcount != 0)
558 panic("vfs_mount_destroy: nonzero writeopcount");
559 if (mp->mnt_secondary_writes != 0)
560 panic("vfs_mount_destroy: nonzero secondary_writes");
561 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1);
562 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
565 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
566 vn_printf(vp, "dangling vnode ");
567 panic("unmount: dangling vnode");
569 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers"));
570 if (mp->mnt_nvnodelistsize != 0)
571 panic("vfs_mount_destroy: nonzero nvnodelistsize");
572 if (mp->mnt_lazyvnodelistsize != 0)
573 panic("vfs_mount_destroy: nonzero lazyvnodelistsize");
574 if (mp->mnt_lockref != 0)
575 panic("vfs_mount_destroy: nonzero lock refcount");
578 if (mp->mnt_vfs_ops != 1)
579 panic("%s: vfs_ops should be 1 but %d found\n", __func__,
582 if (mp->mnt_rootvnode != NULL)
583 panic("%s: mount point still has a root vnode %p\n", __func__,
586 if (mp->mnt_vnodecovered != NULL)
587 vrele(mp->mnt_vnodecovered);
589 mac_mount_destroy(mp);
591 if (mp->mnt_opt != NULL)
592 vfs_freeopts(mp->mnt_opt);
593 crfree(mp->mnt_cred);
594 uma_zfree(mount_zone, mp);
598 vfs_should_downgrade_to_ro_mount(uint64_t fsflags, int error)
600 /* This is an upgrade of an exisiting mount. */
601 if ((fsflags & MNT_UPDATE) != 0)
603 /* This is already an R/O mount. */
604 if ((fsflags & MNT_RDONLY) != 0)
608 case ENODEV: /* generic, geom, ... */
609 case EACCES: /* cam/scsi, ... */
610 case EROFS: /* md, mmcsd, ... */
612 * These errors can be returned by the storage layer to signal
613 * that the media is read-only. No harm in the R/O mount
614 * attempt if the error was returned for some other reason.
623 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
625 struct vfsoptlist *optlist;
626 struct vfsopt *opt, *tmp_opt;
627 char *fstype, *fspath, *errmsg;
628 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
631 errmsg = fspath = NULL;
632 errmsg_len = fspathlen = 0;
634 autoro = default_autoro;
636 error = vfs_buildopts(fsoptions, &optlist);
640 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
641 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
644 * We need these two options before the others,
645 * and they are mandatory for any filesystem.
646 * Ensure they are NUL terminated as well.
649 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
650 if (error || fstypelen <= 0 || fstype[fstypelen - 1] != '\0') {
653 strncpy(errmsg, "Invalid fstype", errmsg_len);
657 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
658 if (error || fspathlen <= 0 || fspath[fspathlen - 1] != '\0') {
661 strncpy(errmsg, "Invalid fspath", errmsg_len);
666 * We need to see if we have the "update" option
667 * before we call vfs_domount(), since vfs_domount() has special
668 * logic based on MNT_UPDATE. This is very important
669 * when we want to update the root filesystem.
671 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
674 if (strcmp(opt->name, "update") == 0) {
675 fsflags |= MNT_UPDATE;
678 else if (strcmp(opt->name, "async") == 0)
679 fsflags |= MNT_ASYNC;
680 else if (strcmp(opt->name, "force") == 0) {
681 fsflags |= MNT_FORCE;
684 else if (strcmp(opt->name, "reload") == 0) {
685 fsflags |= MNT_RELOAD;
688 else if (strcmp(opt->name, "multilabel") == 0)
689 fsflags |= MNT_MULTILABEL;
690 else if (strcmp(opt->name, "noasync") == 0)
691 fsflags &= ~MNT_ASYNC;
692 else if (strcmp(opt->name, "noatime") == 0)
693 fsflags |= MNT_NOATIME;
694 else if (strcmp(opt->name, "atime") == 0) {
695 free(opt->name, M_MOUNT);
696 opt->name = strdup("nonoatime", M_MOUNT);
698 else if (strcmp(opt->name, "noclusterr") == 0)
699 fsflags |= MNT_NOCLUSTERR;
700 else if (strcmp(opt->name, "clusterr") == 0) {
701 free(opt->name, M_MOUNT);
702 opt->name = strdup("nonoclusterr", M_MOUNT);
704 else if (strcmp(opt->name, "noclusterw") == 0)
705 fsflags |= MNT_NOCLUSTERW;
706 else if (strcmp(opt->name, "clusterw") == 0) {
707 free(opt->name, M_MOUNT);
708 opt->name = strdup("nonoclusterw", M_MOUNT);
710 else if (strcmp(opt->name, "noexec") == 0)
711 fsflags |= MNT_NOEXEC;
712 else if (strcmp(opt->name, "exec") == 0) {
713 free(opt->name, M_MOUNT);
714 opt->name = strdup("nonoexec", M_MOUNT);
716 else if (strcmp(opt->name, "nosuid") == 0)
717 fsflags |= MNT_NOSUID;
718 else if (strcmp(opt->name, "suid") == 0) {
719 free(opt->name, M_MOUNT);
720 opt->name = strdup("nonosuid", M_MOUNT);
722 else if (strcmp(opt->name, "nosymfollow") == 0)
723 fsflags |= MNT_NOSYMFOLLOW;
724 else if (strcmp(opt->name, "symfollow") == 0) {
725 free(opt->name, M_MOUNT);
726 opt->name = strdup("nonosymfollow", M_MOUNT);
728 else if (strcmp(opt->name, "noro") == 0) {
729 fsflags &= ~MNT_RDONLY;
732 else if (strcmp(opt->name, "rw") == 0) {
733 fsflags &= ~MNT_RDONLY;
736 else if (strcmp(opt->name, "ro") == 0) {
737 fsflags |= MNT_RDONLY;
740 else if (strcmp(opt->name, "rdonly") == 0) {
741 free(opt->name, M_MOUNT);
742 opt->name = strdup("ro", M_MOUNT);
743 fsflags |= MNT_RDONLY;
746 else if (strcmp(opt->name, "autoro") == 0) {
750 else if (strcmp(opt->name, "suiddir") == 0)
751 fsflags |= MNT_SUIDDIR;
752 else if (strcmp(opt->name, "sync") == 0)
753 fsflags |= MNT_SYNCHRONOUS;
754 else if (strcmp(opt->name, "union") == 0)
755 fsflags |= MNT_UNION;
756 else if (strcmp(opt->name, "automounted") == 0) {
757 fsflags |= MNT_AUTOMOUNTED;
759 } else if (strcmp(opt->name, "nocover") == 0) {
760 fsflags |= MNT_NOCOVER;
762 } else if (strcmp(opt->name, "cover") == 0) {
763 fsflags &= ~MNT_NOCOVER;
765 } else if (strcmp(opt->name, "emptydir") == 0) {
766 fsflags |= MNT_EMPTYDIR;
768 } else if (strcmp(opt->name, "noemptydir") == 0) {
769 fsflags &= ~MNT_EMPTYDIR;
773 vfs_freeopt(optlist, opt);
777 * Be ultra-paranoid about making sure the type and fspath
778 * variables will fit in our mp buffers, including the
781 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) {
782 error = ENAMETOOLONG;
786 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
789 * See if we can mount in the read-only mode if the error code suggests
790 * that it could be possible and the mount options allow for that.
791 * Never try it if "[no]{ro|rw}" has been explicitly requested and not
792 * overridden by "autoro".
794 if (autoro && vfs_should_downgrade_to_ro_mount(fsflags, error)) {
795 printf("%s: R/W mount failed, possibly R/O media,"
796 " trying R/O mount\n", __func__);
797 fsflags |= MNT_RDONLY;
798 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
801 /* copyout the errmsg */
802 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
803 && errmsg_len > 0 && errmsg != NULL) {
804 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
806 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
807 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
810 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
811 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
816 vfs_freeopts(optlist);
823 #ifndef _SYS_SYSPROTO_H_
833 sys_mount(struct thread *td, struct mount_args *uap)
836 struct vfsconf *vfsp = NULL;
837 struct mntarg *ma = NULL;
842 * Mount flags are now 64-bits. On 32-bit architectures only
843 * 32-bits are passed in, but from here on everything handles
844 * 64-bit flags correctly.
848 AUDIT_ARG_FFLAGS(flags);
851 * Filter out MNT_ROOTFS. We do not want clients of mount() in
852 * userspace to set this flag, but we must filter it out if we want
853 * MNT_UPDATE on the root file system to work.
854 * MNT_ROOTFS should only be set by the kernel when mounting its
857 flags &= ~MNT_ROOTFS;
859 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
860 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
862 free(fstype, M_TEMP);
866 AUDIT_ARG_TEXT(fstype);
867 vfsp = vfs_byname_kld(fstype, td, &error);
868 free(fstype, M_TEMP);
871 if (((vfsp->vfc_flags & VFCF_SBDRY) != 0 &&
872 vfsp->vfc_vfsops_sd->vfs_cmount == NULL) ||
873 ((vfsp->vfc_flags & VFCF_SBDRY) == 0 &&
874 vfsp->vfc_vfsops->vfs_cmount == NULL))
877 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN);
878 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
879 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
880 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
881 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
883 if ((vfsp->vfc_flags & VFCF_SBDRY) != 0)
884 return (vfsp->vfc_vfsops_sd->vfs_cmount(ma, uap->data, flags));
885 return (vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags));
889 * vfs_domount_first(): first file system mount (not update)
893 struct thread *td, /* Calling thread. */
894 struct vfsconf *vfsp, /* File system type. */
895 char *fspath, /* Mount path. */
896 struct vnode *vp, /* Vnode to be covered. */
897 uint64_t fsflags, /* Flags common to all filesystems. */
898 struct vfsoptlist **optlist /* Options local to the filesystem. */
906 ASSERT_VOP_ELOCKED(vp, __func__);
907 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
909 if ((fsflags & MNT_EMPTYDIR) != 0) {
910 error = vfs_emptydir(vp);
918 * If the jail of the calling thread lacks permission for this type of
919 * file system, deny immediately.
921 if (jailed(td->td_ucred) && !prison_allow(td->td_ucred,
922 vfsp->vfc_prison_flag)) {
928 * If the user is not root, ensure that they own the directory
929 * onto which we are attempting to mount.
931 error = VOP_GETATTR(vp, &va, td->td_ucred);
932 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
933 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN);
935 error = vinvalbuf(vp, V_SAVE, 0, 0);
936 if (error == 0 && vp->v_type != VDIR)
940 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
941 vp->v_iflag |= VI_MOUNT;
952 /* Allocate and initialize the filesystem. */
953 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
954 /* XXXMAC: pass to vfs_mount_alloc? */
955 mp->mnt_optnew = *optlist;
956 /* Set the mount level flags. */
957 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
960 * Mount the filesystem.
961 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
962 * get. No freeing of cn_pnbuf.
965 if ((error = VFS_MOUNT(mp)) != 0 ||
966 (error1 = VFS_STATFS(mp, &mp->mnt_stat)) != 0 ||
967 (error1 = VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) != 0) {
970 if ((error1 = VFS_UNMOUNT(mp, 0)) != 0)
971 printf("VFS_UNMOUNT returned %d\n", error1);
974 mp->mnt_vnodecovered = NULL;
975 vfs_mount_destroy(mp);
977 vp->v_iflag &= ~VI_MOUNT;
984 if (mp->mnt_opt != NULL)
985 vfs_freeopts(mp->mnt_opt);
986 mp->mnt_opt = mp->mnt_optnew;
990 * Prevent external consumers of mount options from reading mnt_optnew.
992 mp->mnt_optnew = NULL;
995 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
996 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
997 mp->mnt_kern_flag |= MNTK_ASYNC;
999 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1002 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1005 vp->v_iflag &= ~VI_MOUNT;
1007 vp->v_mountedhere = mp;
1008 /* Place the new filesystem at the end of the mount list. */
1009 mtx_lock(&mountlist_mtx);
1010 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
1011 mtx_unlock(&mountlist_mtx);
1012 vfs_event_signal(NULL, VQ_MOUNT, 0);
1013 vn_lock(newdp, LK_EXCLUSIVE | LK_RETRY);
1015 EVENTHANDLER_DIRECT_INVOKE(vfs_mounted, mp, newdp, td);
1017 mountcheckdirs(vp, newdp);
1019 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1020 vfs_allocate_syncvnode(mp);
1027 * vfs_domount_update(): update of mounted file system
1031 struct thread *td, /* Calling thread. */
1032 struct vnode *vp, /* Mount point vnode. */
1033 uint64_t fsflags, /* Flags common to all filesystems. */
1034 struct vfsoptlist **optlist /* Options local to the filesystem. */
1037 struct export_args export;
1038 struct vnode *rootvp;
1041 int error, export_error, len;
1044 ASSERT_VOP_ELOCKED(vp, __func__);
1045 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
1048 if ((vp->v_vflag & VV_ROOT) == 0) {
1049 if (vfs_copyopt(*optlist, "export", &export, sizeof(export))
1059 * We only allow the filesystem to be reloaded if it
1060 * is currently mounted read-only.
1062 flag = mp->mnt_flag;
1063 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
1065 return (EOPNOTSUPP); /* Needs translation */
1068 * Only privileged root, or (if MNT_USER is set) the user that
1069 * did the original mount is permitted to update it.
1071 error = vfs_suser(mp, td);
1076 if (vfs_busy(mp, MBF_NOWAIT)) {
1081 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
1087 vp->v_iflag |= VI_MOUNT;
1094 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
1099 mp->mnt_flag &= ~MNT_UPDATEMASK;
1100 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
1101 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
1102 if ((mp->mnt_flag & MNT_ASYNC) == 0)
1103 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1104 rootvp = vfs_cache_root_clear(mp);
1108 mp->mnt_optnew = *optlist;
1109 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
1112 * Mount the filesystem.
1113 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
1114 * get. No freeing of cn_pnbuf.
1116 error = VFS_MOUNT(mp);
1119 /* Process the export option. */
1120 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp,
1122 /* Assume that there is only 1 ABI for each length. */
1124 case (sizeof(struct oexport_args)):
1125 bzero(&export, sizeof(export));
1127 case (sizeof(export)):
1128 bcopy(bufp, &export, len);
1129 export_error = vfs_export(mp, &export);
1132 export_error = EINVAL;
1139 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
1143 * If we fail, restore old mount flags. MNT_QUOTA is special,
1144 * because it is not part of MNT_UPDATEMASK, but it could have
1145 * changed in the meantime if quotactl(2) was called.
1146 * All in all we want current value of MNT_QUOTA, not the old
1149 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
1151 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1152 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1153 mp->mnt_kern_flag |= MNTK_ASYNC;
1155 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1161 if (mp->mnt_opt != NULL)
1162 vfs_freeopts(mp->mnt_opt);
1163 mp->mnt_opt = mp->mnt_optnew;
1165 (void)VFS_STATFS(mp, &mp->mnt_stat);
1167 * Prevent external consumers of mount options from reading
1170 mp->mnt_optnew = NULL;
1172 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1173 vfs_allocate_syncvnode(mp);
1175 vfs_deallocate_syncvnode(mp);
1180 vp->v_iflag &= ~VI_MOUNT;
1183 return (error != 0 ? error : export_error);
1187 * vfs_domount(): actually attempt a filesystem mount.
1191 struct thread *td, /* Calling thread. */
1192 const char *fstype, /* Filesystem type. */
1193 char *fspath, /* Mount path. */
1194 uint64_t fsflags, /* Flags common to all filesystems. */
1195 struct vfsoptlist **optlist /* Options local to the filesystem. */
1198 struct vfsconf *vfsp;
1199 struct nameidata nd;
1205 * Be ultra-paranoid about making sure the type and fspath
1206 * variables will fit in our mp buffers, including the
1209 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1210 return (ENAMETOOLONG);
1212 if (jailed(td->td_ucred) || usermount == 0) {
1213 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1218 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1220 if (fsflags & MNT_EXPORTED) {
1221 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1225 if (fsflags & MNT_SUIDDIR) {
1226 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1231 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1233 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1234 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1235 fsflags |= MNT_NOSUID | MNT_USER;
1238 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1240 if ((fsflags & MNT_UPDATE) == 0) {
1241 /* Don't try to load KLDs if we're mounting the root. */
1242 if (fsflags & MNT_ROOTFS)
1243 vfsp = vfs_byname(fstype);
1245 vfsp = vfs_byname_kld(fstype, td, &error);
1251 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1253 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1254 UIO_SYSSPACE, fspath, td);
1258 NDFREE(&nd, NDF_ONLY_PNBUF);
1260 if ((fsflags & MNT_UPDATE) == 0) {
1261 if ((vp->v_vflag & VV_ROOT) != 0 &&
1262 (fsflags & MNT_NOCOVER) != 0) {
1266 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1267 strcpy(pathbuf, fspath);
1268 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1269 /* debug.disablefullpath == 1 results in ENODEV */
1270 if (error == 0 || error == ENODEV) {
1271 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1274 free(pathbuf, M_TEMP);
1276 error = vfs_domount_update(td, vp, fsflags, optlist);
1282 * Unmount a filesystem.
1284 * Note: unmount takes a path to the vnode mounted on as argument, not
1285 * special file (as before).
1287 #ifndef _SYS_SYSPROTO_H_
1288 struct unmount_args {
1295 sys_unmount(struct thread *td, struct unmount_args *uap)
1297 struct nameidata nd;
1300 int error, id0, id1;
1302 AUDIT_ARG_VALUE(uap->flags);
1303 if (jailed(td->td_ucred) || usermount == 0) {
1304 error = priv_check(td, PRIV_VFS_UNMOUNT);
1309 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1310 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1312 free(pathbuf, M_TEMP);
1315 if (uap->flags & MNT_BYFSID) {
1316 AUDIT_ARG_TEXT(pathbuf);
1317 /* Decode the filesystem ID. */
1318 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1319 free(pathbuf, M_TEMP);
1323 mtx_lock(&mountlist_mtx);
1324 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1325 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1326 mp->mnt_stat.f_fsid.val[1] == id1) {
1331 mtx_unlock(&mountlist_mtx);
1334 * Try to find global path for path argument.
1336 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1337 UIO_SYSSPACE, pathbuf, td);
1338 if (namei(&nd) == 0) {
1339 NDFREE(&nd, NDF_ONLY_PNBUF);
1340 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1342 if (error == 0 || error == ENODEV)
1345 mtx_lock(&mountlist_mtx);
1346 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1347 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) {
1352 mtx_unlock(&mountlist_mtx);
1354 free(pathbuf, M_TEMP);
1357 * Previously we returned ENOENT for a nonexistent path and
1358 * EINVAL for a non-mountpoint. We cannot tell these apart
1359 * now, so in the !MNT_BYFSID case return the more likely
1360 * EINVAL for compatibility.
1362 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1366 * Don't allow unmounting the root filesystem.
1368 if (mp->mnt_flag & MNT_ROOTFS) {
1372 error = dounmount(mp, uap->flags, td);
1377 * Return error if any of the vnodes, ignoring the root vnode
1378 * and the syncer vnode, have non-zero usecount.
1380 * This function is purely advisory - it can return false positives
1384 vfs_check_usecounts(struct mount *mp)
1386 struct vnode *vp, *mvp;
1388 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1389 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON &&
1390 vp->v_usecount != 0) {
1392 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1402 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags)
1405 mtx_assert(MNT_MTX(mp), MA_OWNED);
1406 mp->mnt_kern_flag &= ~mntkflags;
1407 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) {
1408 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1411 vfs_op_exit_locked(mp);
1413 if (coveredvp != NULL) {
1414 VOP_UNLOCK(coveredvp);
1417 vn_finished_write(mp);
1421 * There are various reference counters associated with the mount point.
1422 * Normally it is permitted to modify them without taking the mnt ilock,
1423 * but this behavior can be temporarily disabled if stable value is needed
1424 * or callers are expected to block (e.g. to not allow new users during
1428 vfs_op_enter(struct mount *mp)
1434 if (mp->mnt_vfs_ops > 1) {
1439 * Paired with a fence in vfs_op_thread_enter(). See the comment
1440 * above it for details.
1442 atomic_thread_fence_seq_cst();
1443 vfs_op_barrier_wait(mp);
1445 * Paired with a fence in vfs_op_thread_exit().
1447 atomic_thread_fence_acq();
1450 zpcpu_replace_cpu(mp->mnt_ref_pcpu, 0, cpu);
1452 zpcpu_replace_cpu(mp->mnt_lockref_pcpu, 0, cpu);
1453 mp->mnt_writeopcount +=
1454 zpcpu_replace_cpu(mp->mnt_writeopcount_pcpu, 0, cpu);
1457 vfs_assert_mount_counters(mp);
1461 vfs_op_exit_locked(struct mount *mp)
1464 mtx_assert(MNT_MTX(mp), MA_OWNED);
1466 if (mp->mnt_vfs_ops <= 0)
1467 panic("%s: invalid vfs_ops count %d for mp %p\n",
1468 __func__, mp->mnt_vfs_ops, mp);
1473 vfs_op_exit(struct mount *mp)
1477 vfs_op_exit_locked(mp);
1482 * It is assumed the caller already posted at least an acquire barrier.
1485 vfs_op_barrier_wait(struct mount *mp)
1491 in_op = zpcpu_get_cpu(mp->mnt_thread_in_ops_pcpu, cpu);
1492 while (atomic_load_int(in_op))
1499 vfs_assert_mount_counters(struct mount *mp)
1503 if (mp->mnt_vfs_ops == 0)
1507 if (*(int *)zpcpu_get_cpu(mp->mnt_ref_pcpu, cpu) != 0 ||
1508 *(int *)zpcpu_get_cpu(mp->mnt_lockref_pcpu, cpu) != 0 ||
1509 *(int *)zpcpu_get_cpu(mp->mnt_writeopcount_pcpu, cpu) != 0)
1510 vfs_dump_mount_counters(mp);
1515 vfs_dump_mount_counters(struct mount *mp)
1518 int ref, lockref, writeopcount;
1520 printf("%s: mp %p vfs_ops %d\n", __func__, mp, mp->mnt_vfs_ops);
1525 count = zpcpu_get_cpu(mp->mnt_ref_pcpu, cpu);
1526 printf("%d ", *count);
1530 printf(" lockref : ");
1531 lockref = mp->mnt_lockref;
1533 count = zpcpu_get_cpu(mp->mnt_lockref_pcpu, cpu);
1534 printf("%d ", *count);
1538 printf("writeopcount: ");
1539 writeopcount = mp->mnt_writeopcount;
1541 count = zpcpu_get_cpu(mp->mnt_writeopcount_pcpu, cpu);
1542 printf("%d ", *count);
1543 writeopcount += *count;
1547 printf("counter struct total\n");
1548 printf("ref %-5d %-5d\n", mp->mnt_ref, ref);
1549 printf("lockref %-5d %-5d\n", mp->mnt_lockref, lockref);
1550 printf("writeopcount %-5d %-5d\n", mp->mnt_writeopcount, writeopcount);
1552 panic("invalid counts on struct mount");
1557 vfs_mount_fetch_counter(struct mount *mp, enum mount_counter which)
1564 base = &mp->mnt_ref;
1565 pcpu = mp->mnt_ref_pcpu;
1567 case MNT_COUNT_LOCKREF:
1568 base = &mp->mnt_lockref;
1569 pcpu = mp->mnt_lockref_pcpu;
1571 case MNT_COUNT_WRITEOPCOUNT:
1572 base = &mp->mnt_writeopcount;
1573 pcpu = mp->mnt_writeopcount_pcpu;
1579 sum += *(int *)zpcpu_get_cpu(pcpu, cpu);
1585 * Do the actual filesystem unmount.
1588 dounmount(struct mount *mp, int flags, struct thread *td)
1590 struct vnode *coveredvp, *rootvp;
1592 uint64_t async_flag;
1595 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1596 mnt_gen_r = mp->mnt_gen;
1599 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1601 * Check for mp being unmounted while waiting for the
1602 * covered vnode lock.
1604 if (coveredvp->v_mountedhere != mp ||
1605 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1606 VOP_UNLOCK(coveredvp);
1614 * Only privileged root, or (if MNT_USER is set) the user that did the
1615 * original mount is permitted to unmount this filesystem.
1617 error = vfs_suser(mp, td);
1619 if (coveredvp != NULL) {
1620 VOP_UNLOCK(coveredvp);
1629 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF);
1631 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 ||
1632 (mp->mnt_flag & MNT_UPDATE) != 0 ||
1633 !TAILQ_EMPTY(&mp->mnt_uppers)) {
1634 dounmount_cleanup(mp, coveredvp, 0);
1637 mp->mnt_kern_flag |= MNTK_UNMOUNT;
1638 rootvp = vfs_cache_root_clear(mp);
1639 if (flags & MNT_NONBUSY) {
1641 error = vfs_check_usecounts(mp);
1644 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT);
1650 /* Allow filesystems to detect that a forced unmount is in progress. */
1651 if (flags & MNT_FORCE) {
1652 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1655 * Must be done after setting MNTK_UNMOUNTF and before
1656 * waiting for mnt_lockref to become 0.
1662 if (mp->mnt_lockref) {
1663 mp->mnt_kern_flag |= MNTK_DRAINING;
1664 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1668 KASSERT(mp->mnt_lockref == 0,
1669 ("%s: invalid lock refcount in the drain path @ %s:%d",
1670 __func__, __FILE__, __LINE__));
1672 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1673 __func__, __FILE__, __LINE__));
1678 if (mp->mnt_flag & MNT_EXPUBLIC)
1679 vfs_setpublicfs(NULL, NULL, NULL);
1682 * From now, we can claim that the use reference on the
1683 * coveredvp is ours, and the ref can be released only by
1684 * successfull unmount by us, or left for later unmount
1685 * attempt. The previously acquired hold reference is no
1686 * longer needed to protect the vnode from reuse.
1688 if (coveredvp != NULL)
1691 vfs_periodic(mp, MNT_WAIT);
1693 async_flag = mp->mnt_flag & MNT_ASYNC;
1694 mp->mnt_flag &= ~MNT_ASYNC;
1695 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1697 cache_purgevfs(mp, false); /* remove cache entries for this file sys */
1698 vfs_deallocate_syncvnode(mp);
1699 error = VFS_UNMOUNT(mp, flags);
1700 vn_finished_write(mp);
1702 * If we failed to flush the dirty blocks for this mount point,
1703 * undo all the cdir/rdir and rootvnode changes we made above.
1704 * Unless we failed to do so because the device is reporting that
1705 * it doesn't exist anymore.
1707 if (error && error != ENXIO) {
1709 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1711 vfs_allocate_syncvnode(mp);
1714 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1715 mp->mnt_flag |= async_flag;
1716 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1717 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1718 mp->mnt_kern_flag |= MNTK_ASYNC;
1719 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1720 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1723 vfs_op_exit_locked(mp);
1726 VOP_UNLOCK(coveredvp);
1729 mtx_lock(&mountlist_mtx);
1730 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1731 mtx_unlock(&mountlist_mtx);
1732 EVENTHANDLER_DIRECT_INVOKE(vfs_unmounted, mp, td);
1733 if (coveredvp != NULL) {
1734 coveredvp->v_mountedhere = NULL;
1735 VOP_UNLOCK(coveredvp);
1737 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1738 if (rootvnode != NULL && mp == rootvnode->v_mount) {
1742 if (mp == rootdevmp)
1744 vfs_mount_destroy(mp);
1749 * Report errors during filesystem mounting.
1752 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1754 struct vfsoptlist *moptlist = mp->mnt_optnew;
1759 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1760 if (error || errmsg == NULL || len <= 0)
1764 vsnprintf(errmsg, (size_t)len, fmt, ap);
1769 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1775 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1776 if (error || errmsg == NULL || len <= 0)
1780 vsnprintf(errmsg, (size_t)len, fmt, ap);
1785 * ---------------------------------------------------------------------
1786 * Functions for querying mount options/arguments from filesystems.
1790 * Check that no unknown options are given
1793 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1797 const char **t, *p, *q;
1800 TAILQ_FOREACH(opt, opts, link) {
1803 if (p[0] == 'n' && p[1] == 'o')
1805 for(t = global_opts; *t != NULL; t++) {
1806 if (strcmp(*t, p) == 0)
1809 if (strcmp(*t, q) == 0)
1815 for(t = legal; *t != NULL; t++) {
1816 if (strcmp(*t, p) == 0)
1819 if (strcmp(*t, q) == 0)
1825 snprintf(errmsg, sizeof(errmsg),
1826 "mount option <%s> is unknown", p);
1830 TAILQ_FOREACH(opt, opts, link) {
1831 if (strcmp(opt->name, "errmsg") == 0) {
1832 strncpy((char *)opt->value, errmsg, opt->len);
1837 printf("%s\n", errmsg);
1843 * Get a mount option by its name.
1845 * Return 0 if the option was found, ENOENT otherwise.
1846 * If len is non-NULL it will be filled with the length
1847 * of the option. If buf is non-NULL, it will be filled
1848 * with the address of the option.
1851 vfs_getopt(struct vfsoptlist *opts, const char *name, void **buf, int *len)
1855 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1857 TAILQ_FOREACH(opt, opts, link) {
1858 if (strcmp(name, opt->name) == 0) {
1871 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1878 TAILQ_FOREACH(opt, opts, link) {
1879 if (strcmp(name, opt->name) == 0) {
1888 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1890 char *opt_value, *vtp;
1894 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1897 if (opt_len == 0 || opt_value == NULL)
1899 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1901 iv = strtoq(opt_value, &vtp, 0);
1902 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1929 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1934 TAILQ_FOREACH(opt, opts, link) {
1935 if (strcmp(name, opt->name) != 0)
1938 if (opt->len == 0 ||
1939 ((char *)opt->value)[opt->len - 1] != '\0') {
1943 return (opt->value);
1950 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1955 TAILQ_FOREACH(opt, opts, link) {
1956 if (strcmp(name, opt->name) == 0) {
1969 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1975 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1977 TAILQ_FOREACH(opt, opts, link) {
1978 if (strcmp(name, opt->name) != 0)
1981 if (opt->len == 0 || opt->value == NULL)
1983 if (((char *)opt->value)[opt->len - 1] != '\0')
1986 ret = vsscanf(opt->value, fmt, ap);
1994 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1998 TAILQ_FOREACH(opt, opts, link) {
1999 if (strcmp(name, opt->name) != 0)
2002 if (opt->value == NULL)
2005 if (opt->len != len)
2007 bcopy(value, opt->value, len);
2015 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
2019 TAILQ_FOREACH(opt, opts, link) {
2020 if (strcmp(name, opt->name) != 0)
2023 if (opt->value == NULL)
2029 bcopy(value, opt->value, len);
2037 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
2041 TAILQ_FOREACH(opt, opts, link) {
2042 if (strcmp(name, opt->name) != 0)
2045 if (opt->value == NULL)
2046 opt->len = strlen(value) + 1;
2047 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
2055 * Find and copy a mount option.
2057 * The size of the buffer has to be specified
2058 * in len, if it is not the same length as the
2059 * mount option, EINVAL is returned.
2060 * Returns ENOENT if the option is not found.
2063 vfs_copyopt(struct vfsoptlist *opts, const char *name, void *dest, int len)
2067 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
2069 TAILQ_FOREACH(opt, opts, link) {
2070 if (strcmp(name, opt->name) == 0) {
2072 if (len != opt->len)
2074 bcopy(opt->value, dest, opt->len);
2082 __vfs_statfs(struct mount *mp, struct statfs *sbp)
2086 * Filesystems only fill in part of the structure for updates, we
2087 * have to read the entirety first to get all content.
2089 memcpy(sbp, &mp->mnt_stat, sizeof(*sbp));
2092 * Set these in case the underlying filesystem fails to do so.
2094 sbp->f_version = STATFS_VERSION;
2095 sbp->f_namemax = NAME_MAX;
2096 sbp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
2098 return (mp->mnt_op->vfs_statfs(mp, sbp));
2102 vfs_mountedfrom(struct mount *mp, const char *from)
2105 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
2106 strlcpy(mp->mnt_stat.f_mntfromname, from,
2107 sizeof mp->mnt_stat.f_mntfromname);
2111 * ---------------------------------------------------------------------
2112 * This is the api for building mount args and mounting filesystems from
2113 * inside the kernel.
2115 * The API works by accumulation of individual args. First error is
2118 * XXX: should be documented in new manpage kernel_mount(9)
2121 /* A memory allocation which must be freed when we are done */
2123 SLIST_ENTRY(mntaarg) next;
2126 /* The header for the mount arguments */
2131 SLIST_HEAD(, mntaarg) list;
2135 * Add a boolean argument.
2137 * flag is the boolean value.
2138 * name must start with "no".
2141 mount_argb(struct mntarg *ma, int flag, const char *name)
2144 KASSERT(name[0] == 'n' && name[1] == 'o',
2145 ("mount_argb(...,%s): name must start with 'no'", name));
2147 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
2151 * Add an argument printf style
2154 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
2157 struct mntaarg *maa;
2162 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
2163 SLIST_INIT(&ma->list);
2168 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
2170 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
2171 ma->v[ma->len].iov_len = strlen(name) + 1;
2174 sb = sbuf_new_auto();
2176 sbuf_vprintf(sb, fmt, ap);
2179 len = sbuf_len(sb) + 1;
2180 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
2181 SLIST_INSERT_HEAD(&ma->list, maa, next);
2182 bcopy(sbuf_data(sb), maa + 1, len);
2185 ma->v[ma->len].iov_base = maa + 1;
2186 ma->v[ma->len].iov_len = len;
2193 * Add an argument which is a userland string.
2196 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
2198 struct mntaarg *maa;
2204 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
2205 SLIST_INIT(&ma->list);
2209 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
2210 SLIST_INSERT_HEAD(&ma->list, maa, next);
2211 tbuf = (void *)(maa + 1);
2212 ma->error = copyinstr(val, tbuf, len, NULL);
2213 return (mount_arg(ma, name, tbuf, -1));
2219 * If length is -1, treat value as a C string.
2222 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
2226 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
2227 SLIST_INIT(&ma->list);
2232 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
2234 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
2235 ma->v[ma->len].iov_len = strlen(name) + 1;
2238 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
2240 ma->v[ma->len].iov_len = strlen(val) + 1;
2242 ma->v[ma->len].iov_len = len;
2248 * Free a mntarg structure
2251 free_mntarg(struct mntarg *ma)
2253 struct mntaarg *maa;
2255 while (!SLIST_EMPTY(&ma->list)) {
2256 maa = SLIST_FIRST(&ma->list);
2257 SLIST_REMOVE_HEAD(&ma->list, next);
2260 free(ma->v, M_MOUNT);
2265 * Mount a filesystem
2268 kernel_mount(struct mntarg *ma, uint64_t flags)
2273 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
2274 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
2275 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
2277 auio.uio_iov = ma->v;
2278 auio.uio_iovcnt = ma->len;
2279 auio.uio_segflg = UIO_SYSSPACE;
2283 error = vfs_donmount(curthread, flags, &auio);
2289 * A printflike function to mount a filesystem.
2292 kernel_vmount(int flags, ...)
2294 struct mntarg *ma = NULL;
2300 va_start(ap, flags);
2302 cp = va_arg(ap, const char *);
2305 vp = va_arg(ap, const void *);
2306 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
2310 error = kernel_mount(ma, flags);
2315 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
2318 bcopy(oexp, exp, sizeof(*oexp));
2319 exp->ex_numsecflavors = 0;