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/clock.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>
54 #include <sys/syscallsubr.h>
55 #include <sys/sysproto.h>
57 #include <sys/sysctl.h>
58 #include <sys/sysent.h>
59 #include <sys/systm.h>
60 #include <sys/vnode.h>
63 #include <geom/geom.h>
65 #include <machine/stdarg.h>
67 #include <security/audit/audit.h>
68 #include <security/mac/mac_framework.h>
70 #include "opt_rootdevname.h"
78 #define ROOTNAME "root_device"
79 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
81 static int vfs_domount(struct thread *td, const char *fstype,
82 char *fspath, int fsflags, void *fsdata);
83 static int vfs_mountroot_ask(void);
84 static int vfs_mountroot_try(const char *mountfrom);
85 static int vfs_donmount(struct thread *td, int fsflags,
86 struct uio *fsoptions);
87 static void free_mntarg(struct mntarg *ma);
88 static int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
90 static int usermount = 0;
91 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0,
92 "Unprivileged users may mount and unmount file systems");
94 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
95 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker");
96 static uma_zone_t mount_zone;
98 /* List of mounted filesystems. */
99 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
101 /* For any iteration/modification of mountlist */
102 struct mtx mountlist_mtx;
103 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
105 TAILQ_HEAD(vfsoptlist, vfsopt);
107 TAILQ_ENTRY(vfsopt) link;
114 * The vnode of the system's root (/ in the filesystem, without chroot
117 struct vnode *rootvnode;
120 * The root filesystem is detailed in the kernel environment variable
121 * vfs.root.mountfrom, which is expected to be in the general format
124 * vfsname := the name of a VFS known to the kernel and capable
125 * of being mounted as root
126 * path := disk device name or other data used by the filesystem
127 * to locate its physical store
131 * Global opts, taken by all filesystems
133 static const char *global_opts[] = {
147 * The root specifiers we will try if RB_CDROM is specified.
149 static char *cdrom_rootdevnames[] = {
155 /* legacy find-root code */
156 char *rootdevnames[2] = {NULL, NULL};
158 # define ROOTDEVNAME NULL
160 static const char *ctrootdevname = ROOTDEVNAME;
163 * ---------------------------------------------------------------------
164 * Functions for building and sanitizing the mount options
167 /* Remove one mount option. */
169 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
172 TAILQ_REMOVE(opts, opt, link);
173 free(opt->name, M_MOUNT);
174 if (opt->value != NULL)
175 free(opt->value, M_MOUNT);
177 else if (opt->len != 0)
178 panic("%s: mount option with NULL value but length != 0",
184 /* Release all resources related to the mount options. */
186 vfs_freeopts(struct vfsoptlist *opts)
190 while (!TAILQ_EMPTY(opts)) {
191 opt = TAILQ_FIRST(opts);
192 vfs_freeopt(opts, opt);
198 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
200 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 * Check if options are equal (with or without the "no" prefix).
212 vfs_equalopts(const char *opt1, const char *opt2)
215 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
216 if (strcmp(opt1, opt2) == 0)
218 /* "noopt" vs. "opt" */
219 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
221 /* "opt" vs. "noopt" */
222 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
228 * If a mount option is specified several times,
229 * (with or without the "no" prefix) only keep
230 * the last occurence of it.
233 vfs_sanitizeopts(struct vfsoptlist *opts)
235 struct vfsopt *opt, *opt2, *tmp;
237 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
238 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
239 while (opt2 != NULL) {
240 if (vfs_equalopts(opt->name, opt2->name)) {
241 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
242 vfs_freeopt(opts, opt2);
245 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
252 * Build a linked list of mount options from a struct uio.
255 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
257 struct vfsoptlist *opts;
260 unsigned int i, iovcnt;
261 int error, namelen, optlen;
263 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
266 iovcnt = auio->uio_iovcnt;
267 for (i = 0; i < iovcnt; i += 2) {
268 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
269 namelen = auio->uio_iov[i].iov_len;
270 optlen = auio->uio_iov[i + 1].iov_len;
271 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
276 * Do this early, so jumps to "bad" will free the current
279 TAILQ_INSERT_TAIL(opts, opt, link);
280 memused += sizeof(struct vfsopt) + optlen + namelen;
283 * Avoid consuming too much memory, and attempts to overflow
286 if (memused > VFS_MOUNTARG_SIZE_MAX ||
287 optlen > VFS_MOUNTARG_SIZE_MAX ||
288 namelen > VFS_MOUNTARG_SIZE_MAX) {
293 if (auio->uio_segflg == UIO_SYSSPACE) {
294 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
296 error = copyin(auio->uio_iov[i].iov_base, opt->name,
301 /* Ensure names are null-terminated strings. */
302 if (opt->name[namelen - 1] != '\0') {
308 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
309 if (auio->uio_segflg == UIO_SYSSPACE) {
310 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
313 error = copyin(auio->uio_iov[i + 1].iov_base,
320 vfs_sanitizeopts(opts);
329 * Merge the old mount options with the new ones passed
330 * in the MNT_UPDATE case.
333 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts)
335 struct vfsopt *opt, *opt2, *new;
337 TAILQ_FOREACH(opt, opts, link) {
339 * Check that this option hasn't been redefined
340 * nor cancelled with a "no" mount option.
342 opt2 = TAILQ_FIRST(toopts);
343 while (opt2 != NULL) {
344 if (strcmp(opt2->name, opt->name) == 0)
346 if (strncmp(opt2->name, "no", 2) == 0 &&
347 strcmp(opt2->name + 2, opt->name) == 0) {
348 vfs_freeopt(toopts, opt2);
351 opt2 = TAILQ_NEXT(opt2, link);
353 /* We want this option, duplicate it. */
354 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
355 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK);
356 strcpy(new->name, opt->name);
358 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
359 bcopy(opt->value, new->value, opt->len);
364 TAILQ_INSERT_TAIL(toopts, new, link);
371 * Mount a filesystem.
376 struct nmount_args /* {
388 AUDIT_ARG(fflags, uap->flags);
390 /* Kick out MNT_ROOTFS early as it is legal internally */
391 if (uap->flags & MNT_ROOTFS)
394 iovcnt = uap->iovcnt;
396 * Check that we have an even number of iovec's
397 * and that we have at least two options.
399 if ((iovcnt & 1) || (iovcnt < 4))
402 error = copyinuio(uap->iovp, iovcnt, &auio);
406 for (i = 0; i < iovcnt; i++) {
407 if (iov->iov_len > MMAXOPTIONLEN) {
413 error = vfs_donmount(td, uap->flags, auio);
420 * ---------------------------------------------------------------------
421 * Various utility functions
425 vfs_ref(struct mount *mp)
434 vfs_rel(struct mount *mp)
443 mount_init(void *mem, int size, int flags)
447 mp = (struct mount *)mem;
448 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
449 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
454 mount_fini(void *mem, int size)
458 mp = (struct mount *)mem;
459 lockdestroy(&mp->mnt_lock);
460 mtx_destroy(&mp->mnt_mtx);
464 * Allocate and initialize the mount point struct.
467 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp,
468 const char *fspath, struct thread *td)
472 mp = uma_zalloc(mount_zone, M_WAITOK);
473 bzero(&mp->mnt_startzero,
474 __rangeof(struct mount, mnt_startzero, mnt_endzero));
475 TAILQ_INIT(&mp->mnt_nvnodelist);
476 mp->mnt_nvnodelistsize = 0;
478 (void) vfs_busy(mp, LK_NOWAIT, 0, td);
479 mp->mnt_op = vfsp->vfc_vfsops;
481 vfsp->vfc_refcount++; /* XXX Unlocked */
482 mp->mnt_stat.f_type = vfsp->vfc_typenum;
484 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
485 mp->mnt_vnodecovered = vp;
486 mp->mnt_cred = crdup(td->td_ucred);
487 mp->mnt_stat.f_owner = td->td_ucred->cr_uid;
488 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
489 mp->mnt_iosize_max = DFLTPHYS;
492 mac_create_mount(td->td_ucred, mp);
494 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
499 * Destroy the mount struct previously allocated by vfs_mount_alloc().
502 vfs_mount_destroy(struct mount *mp)
507 for (i = 0; mp->mnt_ref && i < 3; i++)
508 msleep(mp, MNT_MTX(mp), PVFS, "mntref", hz);
510 * This will always cause a 3 second delay in rebooting due to
511 * refs on the root mountpoint that never go away. Most of these
512 * are held by init which never exits.
514 if (i == 3 && (!rebooting || bootverbose))
515 printf("Mount point %s had %d dangling refs\n",
516 mp->mnt_stat.f_mntonname, mp->mnt_ref);
517 if (mp->mnt_holdcnt != 0) {
518 printf("Waiting for mount point to be unheld\n");
519 while (mp->mnt_holdcnt != 0) {
520 mp->mnt_holdcntwaiters++;
521 msleep(&mp->mnt_holdcnt, MNT_MTX(mp),
522 PZERO, "mntdestroy", 0);
523 mp->mnt_holdcntwaiters--;
525 printf("mount point unheld\n");
527 if (mp->mnt_writeopcount > 0) {
528 printf("Waiting for mount point write ops\n");
529 while (mp->mnt_writeopcount > 0) {
530 mp->mnt_kern_flag |= MNTK_SUSPEND;
531 msleep(&mp->mnt_writeopcount,
533 PZERO, "mntdestroy2", 0);
535 printf("mount point write ops completed\n");
537 if (mp->mnt_secondary_writes > 0) {
538 printf("Waiting for mount point secondary write ops\n");
539 while (mp->mnt_secondary_writes > 0) {
540 mp->mnt_kern_flag |= MNTK_SUSPEND;
541 msleep(&mp->mnt_secondary_writes,
543 PZERO, "mntdestroy3", 0);
545 printf("mount point secondary write ops completed\n");
548 mp->mnt_vfc->vfc_refcount--;
549 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
552 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
554 panic("unmount: dangling vnode");
557 if (mp->mnt_kern_flag & MNTK_MWAIT)
559 if (mp->mnt_writeopcount != 0)
560 panic("vfs_mount_destroy: nonzero writeopcount");
561 if (mp->mnt_secondary_writes != 0)
562 panic("vfs_mount_destroy: nonzero secondary_writes");
563 if (mp->mnt_nvnodelistsize != 0)
564 panic("vfs_mount_destroy: nonzero nvnodelistsize");
565 mp->mnt_writeopcount = -1000;
566 mp->mnt_nvnodelistsize = -1000;
567 mp->mnt_secondary_writes = -1000;
570 mac_destroy_mount(mp);
572 if (mp->mnt_opt != NULL)
573 vfs_freeopts(mp->mnt_opt);
574 crfree(mp->mnt_cred);
575 uma_zfree(mount_zone, mp);
579 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions)
581 struct vfsoptlist *optlist;
582 struct vfsopt *opt, *noro_opt;
583 char *fstype, *fspath, *errmsg;
584 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
585 int has_rw, has_noro;
593 error = vfs_buildopts(fsoptions, &optlist);
597 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
598 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
601 * We need these two options before the others,
602 * and they are mandatory for any filesystem.
603 * Ensure they are NUL terminated as well.
606 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
607 if (error || fstype[fstypelen - 1] != '\0') {
610 strncpy(errmsg, "Invalid fstype", errmsg_len);
614 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
615 if (error || fspath[fspathlen - 1] != '\0') {
618 strncpy(errmsg, "Invalid fspath", errmsg_len);
623 * We need to see if we have the "update" option
624 * before we call vfs_domount(), since vfs_domount() has special
625 * logic based on MNT_UPDATE. This is very important
626 * when we want to update the root filesystem.
628 TAILQ_FOREACH(opt, optlist, link) {
629 if (strcmp(opt->name, "update") == 0)
630 fsflags |= MNT_UPDATE;
631 else if (strcmp(opt->name, "async") == 0)
632 fsflags |= MNT_ASYNC;
633 else if (strcmp(opt->name, "force") == 0)
634 fsflags |= MNT_FORCE;
635 else if (strcmp(opt->name, "multilabel") == 0)
636 fsflags |= MNT_MULTILABEL;
637 else if (strcmp(opt->name, "noasync") == 0)
638 fsflags &= ~MNT_ASYNC;
639 else if (strcmp(opt->name, "noatime") == 0)
640 fsflags |= MNT_NOATIME;
641 else if (strcmp(opt->name, "noclusterr") == 0)
642 fsflags |= MNT_NOCLUSTERR;
643 else if (strcmp(opt->name, "noclusterw") == 0)
644 fsflags |= MNT_NOCLUSTERW;
645 else if (strcmp(opt->name, "noexec") == 0)
646 fsflags |= MNT_NOEXEC;
647 else if (strcmp(opt->name, "nosuid") == 0)
648 fsflags |= MNT_NOSUID;
649 else if (strcmp(opt->name, "nosymfollow") == 0)
650 fsflags |= MNT_NOSYMFOLLOW;
651 else if (strcmp(opt->name, "noro") == 0) {
652 fsflags &= ~MNT_RDONLY;
655 else if (strcmp(opt->name, "rw") == 0) {
656 fsflags &= ~MNT_RDONLY;
659 else if (strcmp(opt->name, "ro") == 0 ||
660 strcmp(opt->name, "rdonly") == 0)
661 fsflags |= MNT_RDONLY;
662 else if (strcmp(opt->name, "snapshot") == 0)
663 fsflags |= MNT_SNAPSHOT;
664 else if (strcmp(opt->name, "suiddir") == 0)
665 fsflags |= MNT_SUIDDIR;
666 else if (strcmp(opt->name, "sync") == 0)
667 fsflags |= MNT_SYNCHRONOUS;
668 else if (strcmp(opt->name, "union") == 0)
669 fsflags |= MNT_UNION;
673 * If "rw" was specified as a mount option, and we
674 * are trying to update a mount-point from "ro" to "rw",
675 * we need a mount option "noro", since in vfs_mergeopts(),
676 * "noro" will cancel "ro", but "rw" will not do anything.
678 if (has_rw && !has_noro) {
679 noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
680 noro_opt->name = strdup("noro", M_MOUNT);
681 noro_opt->value = NULL;
683 TAILQ_INSERT_TAIL(optlist, noro_opt, link);
687 * Be ultra-paranoid about making sure the type and fspath
688 * variables will fit in our mp buffers, including the
691 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
692 error = ENAMETOOLONG;
697 error = vfs_domount(td, fstype, fspath, fsflags, optlist);
700 /* copyout the errmsg */
701 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
702 && errmsg_len > 0 && errmsg != NULL) {
703 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
705 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
706 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
709 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
710 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
715 vfs_freeopts(optlist);
722 #ifndef _SYS_SYSPROTO_H_
734 struct mount_args /* {
742 struct vfsconf *vfsp = NULL;
743 struct mntarg *ma = NULL;
746 AUDIT_ARG(fflags, uap->flags);
748 /* Kick out MNT_ROOTFS early as it is legal internally */
749 uap->flags &= ~MNT_ROOTFS;
751 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
752 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
754 free(fstype, M_TEMP);
758 AUDIT_ARG(text, fstype);
760 vfsp = vfs_byname_kld(fstype, td, &error);
761 free(fstype, M_TEMP);
766 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
771 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN);
772 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
773 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro");
774 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid");
775 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec");
777 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags, td);
784 * vfs_domount(): actually attempt a filesystem mount.
788 struct thread *td, /* Calling thread. */
789 const char *fstype, /* Filesystem type. */
790 char *fspath, /* Mount path. */
791 int fsflags, /* Flags common to all filesystems. */
792 void *fsdata /* Options local to the filesystem. */
797 struct vfsconf *vfsp;
798 struct export_args export;
803 mtx_assert(&Giant, MA_OWNED);
805 * Be ultra-paranoid about making sure the type and fspath
806 * variables will fit in our mp buffers, including the
809 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
810 return (ENAMETOOLONG);
812 if (jailed(td->td_ucred) || usermount == 0) {
813 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
818 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
820 if (fsflags & MNT_EXPORTED) {
821 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
825 if (fsflags & MNT_SUIDDIR) {
826 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
831 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
833 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
834 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
835 fsflags |= MNT_NOSUID | MNT_USER;
838 /* Load KLDs before we lock the covered vnode to avoid reversals. */
840 if ((fsflags & MNT_UPDATE) == 0) {
841 /* Don't try to load KLDs if we're mounting the root. */
842 if (fsflags & MNT_ROOTFS)
843 vfsp = vfs_byname(fstype);
845 vfsp = vfs_byname_kld(fstype, td, &error);
848 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
852 * Get vnode to be covered
854 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE,
856 if ((error = namei(&nd)) != 0)
858 NDFREE(&nd, NDF_ONLY_PNBUF);
860 if (fsflags & MNT_UPDATE) {
861 if ((vp->v_vflag & VV_ROOT) == 0) {
869 * We only allow the filesystem to be reloaded if it
870 * is currently mounted read-only.
872 if ((fsflags & MNT_RELOAD) &&
873 ((mp->mnt_flag & MNT_RDONLY) == 0)) {
876 return (EOPNOTSUPP); /* Needs translation */
880 * Only privileged root, or (if MNT_USER is set) the user that
881 * did the original mount is permitted to update it.
883 error = vfs_suser(mp, td);
888 if (vfs_busy(mp, LK_NOWAIT, 0, td)) {
893 if ((vp->v_iflag & VI_MOUNT) != 0 ||
894 vp->v_mountedhere != NULL) {
900 vp->v_iflag |= VI_MOUNT;
903 mp->mnt_flag |= fsflags &
904 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS);
906 VOP_UNLOCK(vp, 0, td);
907 mp->mnt_optnew = fsdata;
908 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
911 * If the user is not root, ensure that they own the directory
912 * onto which we are attempting to mount.
914 error = VOP_GETATTR(vp, &va, td->td_ucred, td);
919 if (va.va_uid != td->td_ucred->cr_uid) {
920 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN,
927 error = vinvalbuf(vp, V_SAVE, td, 0, 0);
932 if (vp->v_type != VDIR) {
937 if ((vp->v_iflag & VI_MOUNT) != 0 ||
938 vp->v_mountedhere != NULL) {
943 vp->v_iflag |= VI_MOUNT;
947 * Allocate and initialize the filesystem.
949 mp = vfs_mount_alloc(vp, vfsp, fspath, td);
950 VOP_UNLOCK(vp, 0, td);
952 /* XXXMAC: pass to vfs_mount_alloc? */
953 mp->mnt_optnew = fsdata;
957 * Set the mount level flags.
960 mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) |
961 (fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS |
963 if ((mp->mnt_flag & MNT_ASYNC) == 0)
964 mp->mnt_kern_flag &= ~MNTK_ASYNC;
967 * Mount the filesystem.
968 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
969 * get. No freeing of cn_pnbuf.
971 error = VFS_MOUNT(mp, td);
974 * Process the export option only if we are
975 * updating mount options.
977 if (!error && (fsflags & MNT_UPDATE)) {
978 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
979 sizeof(export)) == 0)
980 error = vfs_export(mp, &export);
984 if (mp->mnt_opt != NULL)
985 vfs_freeopts(mp->mnt_opt);
986 mp->mnt_opt = mp->mnt_optnew;
987 (void)VFS_STATFS(mp, &mp->mnt_stat, td);
990 * Prevent external consumers of mount options from reading
993 mp->mnt_optnew = NULL;
994 if (mp->mnt_flag & MNT_UPDATE) {
997 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) |
1000 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD |
1001 MNT_FORCE | MNT_SNAPSHOT);
1002 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
1003 mp->mnt_kern_flag |= MNTK_ASYNC;
1005 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1007 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1008 if (mp->mnt_syncer == NULL)
1009 error = vfs_allocate_syncvnode(mp);
1011 if (mp->mnt_syncer != NULL)
1012 vrele(mp->mnt_syncer);
1013 mp->mnt_syncer = NULL;
1017 vp->v_iflag &= ~VI_MOUNT;
1023 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
1024 mp->mnt_kern_flag |= MNTK_ASYNC;
1026 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1028 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
1030 * Put the new filesystem on the mount list after root.
1034 struct vnode *newdp;
1037 vp->v_iflag &= ~VI_MOUNT;
1039 vp->v_mountedhere = mp;
1040 mtx_lock(&mountlist_mtx);
1041 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
1042 mtx_unlock(&mountlist_mtx);
1043 vfs_event_signal(NULL, VQ_MOUNT, 0);
1044 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td))
1045 panic("mount: lost mount");
1046 mountcheckdirs(vp, newdp);
1048 VOP_UNLOCK(vp, 0, td);
1049 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1050 error = vfs_allocate_syncvnode(mp);
1056 vp->v_iflag &= ~VI_MOUNT;
1059 vfs_mount_destroy(mp);
1066 * Unmount a filesystem.
1068 * Note: unmount takes a path to the vnode mounted on as argument, not
1069 * special file (as before).
1071 #ifndef _SYS_SYSPROTO_H_
1072 struct unmount_args {
1081 register struct unmount_args /* {
1088 int error, id0, id1;
1090 if (jailed(td->td_ucred) || usermount == 0) {
1091 error = priv_check(td, PRIV_VFS_UNMOUNT);
1096 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1097 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1099 free(pathbuf, M_TEMP);
1102 AUDIT_ARG(upath, td, pathbuf, ARG_UPATH1);
1104 if (uap->flags & MNT_BYFSID) {
1105 /* Decode the filesystem ID. */
1106 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1108 free(pathbuf, M_TEMP);
1112 mtx_lock(&mountlist_mtx);
1113 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1114 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1115 mp->mnt_stat.f_fsid.val[1] == id1)
1118 mtx_unlock(&mountlist_mtx);
1120 mtx_lock(&mountlist_mtx);
1121 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1122 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1125 mtx_unlock(&mountlist_mtx);
1127 free(pathbuf, M_TEMP);
1130 * Previously we returned ENOENT for a nonexistent path and
1131 * EINVAL for a non-mountpoint. We cannot tell these apart
1132 * now, so in the !MNT_BYFSID case return the more likely
1133 * EINVAL for compatibility.
1136 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1140 * Don't allow unmounting the root filesystem.
1142 if (mp->mnt_flag & MNT_ROOTFS) {
1146 error = dounmount(mp, uap->flags, td);
1152 * Do the actual filesystem unmount.
1155 dounmount(mp, flags, td)
1160 struct vnode *coveredvp, *fsrootvp;
1165 mtx_assert(&Giant, MA_OWNED);
1167 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1168 mnt_gen_r = mp->mnt_gen;
1171 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, td);
1174 * Check for mp being unmounted while waiting for the
1175 * covered vnode lock.
1177 if (coveredvp->v_mountedhere != mp ||
1178 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1179 VOP_UNLOCK(coveredvp, 0, td);
1184 * Only privileged root, or (if MNT_USER is set) the user that did the
1185 * original mount is permitted to unmount this filesystem.
1187 error = vfs_suser(mp, td);
1190 VOP_UNLOCK(coveredvp, 0, td);
1195 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
1198 VOP_UNLOCK(coveredvp, 0, td);
1201 mp->mnt_kern_flag |= MNTK_UNMOUNT;
1202 /* Allow filesystems to detect that a forced unmount is in progress. */
1203 if (flags & MNT_FORCE)
1204 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1205 error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK |
1206 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), MNT_MTX(mp), td);
1209 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1210 if (mp->mnt_kern_flag & MNTK_MWAIT)
1214 VOP_UNLOCK(coveredvp, 0, td);
1217 vn_start_write(NULL, &mp, V_WAIT);
1219 if (mp->mnt_flag & MNT_EXPUBLIC)
1220 vfs_setpublicfs(NULL, NULL, NULL);
1222 vfs_msync(mp, MNT_WAIT);
1224 async_flag = mp->mnt_flag & MNT_ASYNC;
1225 mp->mnt_flag &= ~MNT_ASYNC;
1226 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1228 cache_purgevfs(mp); /* remove cache entries for this file sys */
1229 if (mp->mnt_syncer != NULL)
1230 vrele(mp->mnt_syncer);
1232 * For forced unmounts, move process cdir/rdir refs on the fs root
1233 * vnode to the covered vnode. For non-forced unmounts we want
1234 * such references to cause an EBUSY error.
1236 if ((flags & MNT_FORCE) &&
1237 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) {
1238 if (mp->mnt_vnodecovered != NULL)
1239 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1240 if (fsrootvp == rootvnode) {
1246 if (((mp->mnt_flag & MNT_RDONLY) ||
1247 (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) ||
1248 (flags & MNT_FORCE)) {
1249 error = VFS_UNMOUNT(mp, flags, td);
1251 vn_finished_write(mp);
1253 /* Undo cdir/rdir and rootvnode changes made above. */
1254 if ((flags & MNT_FORCE) &&
1255 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) {
1256 if (mp->mnt_vnodecovered != NULL)
1257 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1258 if (rootvnode == NULL) {
1259 rootvnode = fsrootvp;
1264 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL)
1265 (void) vfs_allocate_syncvnode(mp);
1267 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1268 mp->mnt_flag |= async_flag;
1269 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
1270 mp->mnt_kern_flag |= MNTK_ASYNC;
1271 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td);
1272 if (mp->mnt_kern_flag & MNTK_MWAIT)
1276 VOP_UNLOCK(coveredvp, 0, td);
1279 mtx_lock(&mountlist_mtx);
1280 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1281 mtx_unlock(&mountlist_mtx);
1282 if (coveredvp != NULL) {
1283 coveredvp->v_mountedhere = NULL;
1286 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1287 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td);
1288 vfs_mount_destroy(mp);
1293 * ---------------------------------------------------------------------
1294 * Mounting of root filesystem
1298 struct root_hold_token {
1300 LIST_ENTRY(root_hold_token) list;
1303 static LIST_HEAD(, root_hold_token) root_holds =
1304 LIST_HEAD_INITIALIZER(&root_holds);
1306 static int root_mount_complete;
1311 struct root_hold_token *
1312 root_mount_hold(const char *identifier)
1314 struct root_hold_token *h;
1316 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
1317 h->who = identifier;
1318 mtx_lock(&mountlist_mtx);
1319 LIST_INSERT_HEAD(&root_holds, h, list);
1320 mtx_unlock(&mountlist_mtx);
1325 * Release root mount.
1328 root_mount_rel(struct root_hold_token *h)
1331 mtx_lock(&mountlist_mtx);
1332 LIST_REMOVE(h, list);
1333 wakeup(&root_holds);
1334 mtx_unlock(&mountlist_mtx);
1339 * Wait for all subsystems to release root mount.
1342 root_mount_prepare(void)
1344 struct root_hold_token *h;
1350 mtx_lock(&mountlist_mtx);
1351 if (LIST_EMPTY(&root_holds)) {
1352 mtx_unlock(&mountlist_mtx);
1355 printf("Root mount waiting for:");
1356 LIST_FOREACH(h, &root_holds, list)
1357 printf(" %s", h->who);
1359 msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold",
1365 * Root was mounted, share the good news.
1368 root_mount_done(void)
1372 * Use a mutex to prevent the wakeup being missed and waiting for
1373 * an extra 1 second sleep.
1375 mtx_lock(&mountlist_mtx);
1376 root_mount_complete = 1;
1377 wakeup(&root_mount_complete);
1378 mtx_unlock(&mountlist_mtx);
1382 * Return true if root is already mounted.
1388 /* No mutex is acquired here because int stores are atomic. */
1389 return (root_mount_complete);
1393 * Wait until root is mounted.
1396 root_mount_wait(void)
1400 * Panic on an obvious deadlock - the function can't be called from
1401 * a thread which is doing the whole SYSINIT stuff.
1403 KASSERT(curthread->td_proc->p_pid != 0,
1404 ("root_mount_wait: cannot be called from the swapper thread"));
1405 mtx_lock(&mountlist_mtx);
1406 while (!root_mount_complete) {
1407 msleep(&root_mount_complete, &mountlist_mtx, PZERO, "rootwait",
1410 mtx_unlock(&mountlist_mtx);
1414 set_rootvnode(struct thread *td)
1418 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td))
1419 panic("Cannot find root vnode");
1422 FILEDESC_SLOCK(p->p_fd);
1424 if (p->p_fd->fd_cdir != NULL)
1425 vrele(p->p_fd->fd_cdir);
1426 p->p_fd->fd_cdir = rootvnode;
1429 if (p->p_fd->fd_rdir != NULL)
1430 vrele(p->p_fd->fd_rdir);
1431 p->p_fd->fd_rdir = rootvnode;
1434 FILEDESC_SUNLOCK(p->p_fd);
1436 VOP_UNLOCK(rootvnode, 0, td);
1440 * Mount /devfs as our root filesystem, but do not put it on the mountlist
1441 * yet. Create a /dev -> / symlink so that absolute pathnames will lookup.
1447 struct thread *td = curthread;
1448 struct vfsoptlist *opts;
1449 struct vfsconf *vfsp;
1450 struct mount *mp = NULL;
1453 vfsp = vfs_byname("devfs");
1454 KASSERT(vfsp != NULL, ("Could not find devfs by name"));
1458 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td);
1460 error = VFS_MOUNT(mp, td);
1461 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
1465 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
1469 mtx_lock(&mountlist_mtx);
1470 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
1471 mtx_unlock(&mountlist_mtx);
1475 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE);
1477 printf("kern_symlink /dev -> / returns %d\n", error);
1481 * Surgically move our devfs to be mounted on /dev.
1485 devfs_fixup(struct thread *td)
1487 struct nameidata nd;
1489 struct vnode *vp, *dvp;
1492 /* Remove our devfs mount from the mountlist and purge the cache */
1493 mtx_lock(&mountlist_mtx);
1494 mp = TAILQ_FIRST(&mountlist);
1495 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1496 mtx_unlock(&mountlist_mtx);
1499 VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td);
1501 dvp->v_iflag &= ~VI_MOUNT;
1502 dvp->v_mountedhere = NULL;
1505 /* Set up the real rootvnode, and purge the cache */
1506 TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL;
1508 cache_purgevfs(rootvnode->v_mount);
1510 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
1513 printf("Lookup of /dev for devfs, error: %d\n", error);
1516 NDFREE(&nd, NDF_ONLY_PNBUF);
1518 if (vp->v_type != VDIR) {
1521 error = vinvalbuf(vp, V_SAVE, td, 0, 0);
1526 mp->mnt_vnodecovered = vp;
1527 vp->v_mountedhere = mp;
1528 mtx_lock(&mountlist_mtx);
1529 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
1530 mtx_unlock(&mountlist_mtx);
1531 VOP_UNLOCK(vp, 0, td);
1535 /* Unlink the no longer needed /dev/dev -> / symlink */
1536 kern_unlink(td, "/dev/dev", UIO_SYSSPACE);
1540 * Report errors during filesystem mounting.
1543 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1545 struct vfsoptlist *moptlist = mp->mnt_optnew;
1550 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1551 if (error || errmsg == NULL || len <= 0)
1555 vsnprintf(errmsg, (size_t)len, fmt, ap);
1560 * Find and mount the root filesystem
1566 int error, i, asked = 0;
1568 root_mount_prepare();
1570 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount),
1571 NULL, NULL, mount_init, mount_fini,
1572 UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
1576 * We are booted with instructions to prompt for the root filesystem.
1578 if (boothowto & RB_ASKNAME) {
1579 if (!vfs_mountroot_ask())
1585 * The root filesystem information is compiled in, and we are
1586 * booted with instructions to use it.
1588 if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) {
1589 if (!vfs_mountroot_try(ctrootdevname))
1591 ctrootdevname = NULL;
1595 * We've been given the generic "use CDROM as root" flag. This is
1596 * necessary because one media may be used in many different
1597 * devices, so we need to search for them.
1599 if (boothowto & RB_CDROM) {
1600 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
1601 if (!vfs_mountroot_try(cdrom_rootdevnames[i]))
1607 * Try to use the value read by the loader from /etc/fstab, or
1608 * supplied via some other means. This is the preferred
1611 cp = getenv("vfs.root.mountfrom");
1613 error = vfs_mountroot_try(cp);
1620 * Try values that may have been computed by code during boot
1622 if (!vfs_mountroot_try(rootdevnames[0]))
1624 if (!vfs_mountroot_try(rootdevnames[1]))
1628 * If we (still) have a compiled-in default, try it.
1630 if (ctrootdevname != NULL)
1631 if (!vfs_mountroot_try(ctrootdevname))
1634 * Everything so far has failed, prompt on the console if we haven't
1635 * already tried that.
1638 if (!vfs_mountroot_ask())
1641 panic("Root mount failed, startup aborted.");
1648 * Mount (mountfrom) as the root filesystem.
1651 vfs_mountroot_try(const char *mountfrom)
1654 char *vfsname, *path;
1664 if (mountfrom == NULL)
1665 return (error); /* don't complain */
1666 printf("Trying to mount root from %s\n", mountfrom);
1668 /* parse vfs name and path */
1669 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK);
1670 path = malloc(MNAMELEN, M_MOUNT, M_WAITOK);
1671 vfsname[0] = path[0] = 0;
1672 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN);
1673 if (sscanf(mountfrom, patt, vfsname, path) < 1)
1676 if (path[0] == '\0')
1677 strcpy(path, ROOTNAME);
1679 error = kernel_vmount(
1680 MNT_RDONLY | MNT_ROOTFS,
1687 * We mount devfs prior to mounting the / FS, so the first
1688 * entry will typically be devfs.
1690 mp = TAILQ_FIRST(&mountlist);
1691 KASSERT(mp != NULL, ("%s: mountlist is empty", __func__));
1694 * Iterate over all currently mounted file systems and use
1695 * the time stamp found to check and/or initialize the RTC.
1696 * Typically devfs has no time stamp and the only other FS
1697 * is the actual / FS.
1698 * Call inittodr() only once and pass it the largest of the
1699 * timestamps we encounter.
1703 if (mp->mnt_time > timebase)
1704 timebase = mp->mnt_time;
1705 mp = TAILQ_NEXT(mp, mnt_list);
1706 } while (mp != NULL);
1709 devfs_fixup(curthread);
1712 free(path, M_MOUNT);
1713 free(vfsname, M_MOUNT);
1718 * ---------------------------------------------------------------------
1719 * Interactive root filesystem selection code.
1723 vfs_mountroot_ask(void)
1728 printf("\nManual root filesystem specification:\n");
1729 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n");
1730 #if defined(__amd64__) || defined(__i386__) || defined(__ia64__)
1731 printf(" eg. ufs:da0s1a\n");
1733 printf(" eg. ufs:/dev/da0a\n");
1735 printf(" ? List valid disk boot devices\n");
1736 printf(" <empty line> Abort manual input\n");
1737 printf("\nmountroot> ");
1738 gets(name, sizeof(name), 1);
1739 if (name[0] == '\0')
1741 if (name[0] == '?') {
1742 printf("\nList of GEOM managed disk devices:\n ");
1746 if (!vfs_mountroot_try(name))
1752 * ---------------------------------------------------------------------
1753 * Functions for querying mount options/arguments from filesystems.
1757 * Check that no unknown options are given
1760 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1765 TAILQ_FOREACH(opt, opts, link) {
1767 if (p[0] == 'n' && p[1] == 'o')
1769 for(t = global_opts; *t != NULL; t++)
1774 for(t = legal; *t != NULL; t++)
1779 printf("mount option <%s> is unknown\n", p);
1786 * Get a mount option by its name.
1788 * Return 0 if the option was found, ENOENT otherwise.
1789 * If len is non-NULL it will be filled with the length
1790 * of the option. If buf is non-NULL, it will be filled
1791 * with the address of the option.
1794 vfs_getopt(opts, name, buf, len)
1795 struct vfsoptlist *opts;
1802 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1804 TAILQ_FOREACH(opt, opts, link) {
1805 if (strcmp(name, opt->name) == 0) {
1817 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1826 TAILQ_FOREACH(opt, opts, link) {
1827 if (strcmp(name, opt->name) == 0)
1835 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1840 TAILQ_FOREACH(opt, opts, link) {
1841 if (strcmp(name, opt->name) != 0)
1843 if (((char *)opt->value)[opt->len - 1] != '\0') {
1847 return (opt->value);
1854 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val)
1858 TAILQ_FOREACH(opt, opts, link) {
1859 if (strcmp(name, opt->name) == 0) {
1871 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1877 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1879 TAILQ_FOREACH(opt, opts, link) {
1880 if (strcmp(name, opt->name) != 0)
1882 if (((char *)opt->value)[opt->len - 1] != '\0')
1885 ret = vsscanf(opt->value, fmt, ap);
1893 * Find and copy a mount option.
1895 * The size of the buffer has to be specified
1896 * in len, if it is not the same length as the
1897 * mount option, EINVAL is returned.
1898 * Returns ENOENT if the option is not found.
1901 vfs_copyopt(opts, name, dest, len)
1902 struct vfsoptlist *opts;
1909 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1911 TAILQ_FOREACH(opt, opts, link) {
1912 if (strcmp(name, opt->name) == 0) {
1913 if (len != opt->len)
1915 bcopy(opt->value, dest, opt->len);
1923 * This is a helper function for filesystems to traverse their
1924 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h
1928 __mnt_vnode_next(struct vnode **mvp, struct mount *mp)
1932 mtx_assert(MNT_MTX(mp), MA_OWNED);
1934 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
1935 vp = TAILQ_NEXT(*mvp, v_nmntvnodes);
1936 while (vp != NULL && vp->v_type == VMARKER)
1937 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1939 /* Check if we are done */
1941 __mnt_vnode_markerfree(mvp, mp);
1944 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
1945 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1950 __mnt_vnode_first(struct vnode **mvp, struct mount *mp)
1954 mtx_assert(MNT_MTX(mp), MA_OWNED);
1956 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1957 while (vp != NULL && vp->v_type == VMARKER)
1958 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1960 /* Check if we are done */
1967 *mvp = (struct vnode *) malloc(sizeof(struct vnode),
1971 (*mvp)->v_type = VMARKER;
1973 vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
1974 while (vp != NULL && vp->v_type == VMARKER)
1975 vp = TAILQ_NEXT(vp, v_nmntvnodes);
1977 /* Check if we are done */
1980 free(*mvp, M_VNODE_MARKER);
1984 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0)
1985 wakeup(&mp->mnt_holdcnt);
1988 mp->mnt_markercnt++;
1989 (*mvp)->v_mount = mp;
1990 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
1996 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp)
2002 mtx_assert(MNT_MTX(mp), MA_OWNED);
2004 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
2005 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
2007 free(*mvp, M_VNODE_MARKER);
2011 mp->mnt_markercnt--;
2013 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0)
2014 wakeup(&mp->mnt_holdcnt);
2019 __vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
2023 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat, td);
2024 if (sbp != &mp->mnt_stat)
2025 *sbp = mp->mnt_stat;
2030 vfs_mountedfrom(struct mount *mp, const char *from)
2033 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
2034 strlcpy(mp->mnt_stat.f_mntfromname, from,
2035 sizeof mp->mnt_stat.f_mntfromname);
2039 * ---------------------------------------------------------------------
2040 * This is the api for building mount args and mounting filesystems from
2041 * inside the kernel.
2043 * The API works by accumulation of individual args. First error is
2046 * XXX: should be documented in new manpage kernel_mount(9)
2049 /* A memory allocation which must be freed when we are done */
2051 SLIST_ENTRY(mntaarg) next;
2054 /* The header for the mount arguments */
2059 SLIST_HEAD(, mntaarg) list;
2063 * Add a boolean argument.
2065 * flag is the boolean value.
2066 * name must start with "no".
2069 mount_argb(struct mntarg *ma, int flag, const char *name)
2072 KASSERT(name[0] == 'n' && name[1] == 'o',
2073 ("mount_argb(...,%s): name must start with 'no'", name));
2075 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
2079 * Add an argument printf style
2082 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
2085 struct mntaarg *maa;
2090 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
2091 SLIST_INIT(&ma->list);
2096 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
2098 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
2099 ma->v[ma->len].iov_len = strlen(name) + 1;
2102 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
2104 sbuf_vprintf(sb, fmt, ap);
2107 len = sbuf_len(sb) + 1;
2108 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
2109 SLIST_INSERT_HEAD(&ma->list, maa, next);
2110 bcopy(sbuf_data(sb), maa + 1, len);
2113 ma->v[ma->len].iov_base = maa + 1;
2114 ma->v[ma->len].iov_len = len;
2121 * Add an argument which is a userland string.
2124 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
2126 struct mntaarg *maa;
2132 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
2133 SLIST_INIT(&ma->list);
2137 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
2138 SLIST_INSERT_HEAD(&ma->list, maa, next);
2139 tbuf = (void *)(maa + 1);
2140 ma->error = copyinstr(val, tbuf, len, NULL);
2141 return (mount_arg(ma, name, tbuf, -1));
2147 * If length is -1, use printf.
2150 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
2154 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
2155 SLIST_INIT(&ma->list);
2160 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
2162 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
2163 ma->v[ma->len].iov_len = strlen(name) + 1;
2166 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
2168 ma->v[ma->len].iov_len = strlen(val) + 1;
2170 ma->v[ma->len].iov_len = len;
2176 * Free a mntarg structure
2179 free_mntarg(struct mntarg *ma)
2181 struct mntaarg *maa;
2183 while (!SLIST_EMPTY(&ma->list)) {
2184 maa = SLIST_FIRST(&ma->list);
2185 SLIST_REMOVE_HEAD(&ma->list, next);
2188 free(ma->v, M_MOUNT);
2193 * Mount a filesystem
2196 kernel_mount(struct mntarg *ma, int flags)
2201 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
2202 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
2203 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
2205 auio.uio_iov = ma->v;
2206 auio.uio_iovcnt = ma->len;
2207 auio.uio_segflg = UIO_SYSSPACE;
2211 error = vfs_donmount(curthread, flags, &auio);
2217 * A printflike function to mount a filesystem.
2220 kernel_vmount(int flags, ...)
2222 struct mntarg *ma = NULL;
2228 va_start(ap, flags);
2230 cp = va_arg(ap, const char *);
2233 vp = va_arg(ap, const void *);
2234 ma = mount_arg(ma, cp, vp, -1);
2238 error = kernel_mount(ma, flags);