236 */
237static void
238vfs_sanitizeopts(struct vfsoptlist *opts)
239{
240 struct vfsopt *opt, *opt2, *tmp;
241
242 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
243 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
244 while (opt2 != NULL) {
245 if (vfs_equalopts(opt->name, opt2->name)) {
246 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
247 vfs_freeopt(opts, opt2);
248 opt2 = tmp;
249 } else {
250 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
251 }
252 }
253 }
254}
255
256/*
257 * Build a linked list of mount options from a struct uio.
258 */
259int
260vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
261{
262 struct vfsoptlist *opts;
263 struct vfsopt *opt;
264 size_t memused, namelen, optlen;
265 unsigned int i, iovcnt;
266 int error;
267
268 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
269 TAILQ_INIT(opts);
270 memused = 0;
271 iovcnt = auio->uio_iovcnt;
272 for (i = 0; i < iovcnt; i += 2) {
273 namelen = auio->uio_iov[i].iov_len;
274 optlen = auio->uio_iov[i + 1].iov_len;
275 memused += sizeof(struct vfsopt) + optlen + namelen;
276 /*
277 * Avoid consuming too much memory, and attempts to overflow
278 * memused.
279 */
280 if (memused > VFS_MOUNTARG_SIZE_MAX ||
281 optlen > VFS_MOUNTARG_SIZE_MAX ||
282 namelen > VFS_MOUNTARG_SIZE_MAX) {
283 error = EINVAL;
284 goto bad;
285 }
286
287 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
288 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
289 opt->value = NULL;
290 opt->len = 0;
291 opt->pos = i / 2;
292 opt->seen = 0;
293
294 /*
295 * Do this early, so jumps to "bad" will free the current
296 * option.
297 */
298 TAILQ_INSERT_TAIL(opts, opt, link);
299
300 if (auio->uio_segflg == UIO_SYSSPACE) {
301 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
302 } else {
303 error = copyin(auio->uio_iov[i].iov_base, opt->name,
304 namelen);
305 if (error)
306 goto bad;
307 }
308 /* Ensure names are null-terminated strings. */
309 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
310 error = EINVAL;
311 goto bad;
312 }
313 if (optlen != 0) {
314 opt->len = optlen;
315 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
316 if (auio->uio_segflg == UIO_SYSSPACE) {
317 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
318 optlen);
319 } else {
320 error = copyin(auio->uio_iov[i + 1].iov_base,
321 opt->value, optlen);
322 if (error)
323 goto bad;
324 }
325 }
326 }
327 vfs_sanitizeopts(opts);
328 *options = opts;
329 return (0);
330bad:
331 vfs_freeopts(opts);
332 return (error);
333}
334
335/*
336 * Merge the old mount options with the new ones passed
337 * in the MNT_UPDATE case.
338 *
339 * XXX: This function will keep a "nofoo" option in the new
340 * options. E.g, if the option's canonical name is "foo",
341 * "nofoo" ends up in the mount point's active options.
342 */
343static void
344vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
345{
346 struct vfsopt *opt, *new;
347
348 TAILQ_FOREACH(opt, oldopts, link) {
349 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
350 new->name = strdup(opt->name, M_MOUNT);
351 if (opt->len != 0) {
352 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
353 bcopy(opt->value, new->value, opt->len);
354 } else
355 new->value = NULL;
356 new->len = opt->len;
357 new->seen = opt->seen;
358 TAILQ_INSERT_HEAD(toopts, new, link);
359 }
360 vfs_sanitizeopts(toopts);
361}
362
363/*
364 * Mount a filesystem.
365 */
366int
367sys_nmount(td, uap)
368 struct thread *td;
369 struct nmount_args /* {
370 struct iovec *iovp;
371 unsigned int iovcnt;
372 int flags;
373 } */ *uap;
374{
375 struct uio *auio;
376 int error;
377 u_int iovcnt;
378 uint64_t flags;
379
380 /*
381 * Mount flags are now 64-bits. On 32-bit archtectures only
382 * 32-bits are passed in, but from here on everything handles
383 * 64-bit flags correctly.
384 */
385 flags = uap->flags;
386
387 AUDIT_ARG_FFLAGS(flags);
388 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
389 uap->iovp, uap->iovcnt, flags);
390
391 /*
392 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
393 * userspace to set this flag, but we must filter it out if we want
394 * MNT_UPDATE on the root file system to work.
395 * MNT_ROOTFS should only be set by the kernel when mounting its
396 * root file system.
397 */
398 flags &= ~MNT_ROOTFS;
399
400 iovcnt = uap->iovcnt;
401 /*
402 * Check that we have an even number of iovec's
403 * and that we have at least two options.
404 */
405 if ((iovcnt & 1) || (iovcnt < 4)) {
406 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
407 uap->iovcnt);
408 return (EINVAL);
409 }
410
411 error = copyinuio(uap->iovp, iovcnt, &auio);
412 if (error) {
413 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
414 __func__, error);
415 return (error);
416 }
417 error = vfs_donmount(td, flags, auio);
418
419 free(auio, M_IOV);
420 return (error);
421}
422
423/*
424 * ---------------------------------------------------------------------
425 * Various utility functions
426 */
427
428void
429vfs_ref(struct mount *mp)
430{
431
432 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
433 MNT_ILOCK(mp);
434 MNT_REF(mp);
435 MNT_IUNLOCK(mp);
436}
437
438void
439vfs_rel(struct mount *mp)
440{
441
442 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
443 MNT_ILOCK(mp);
444 MNT_REL(mp);
445 MNT_IUNLOCK(mp);
446}
447
448/*
449 * Allocate and initialize the mount point struct.
450 */
451struct mount *
452vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
453 struct ucred *cred)
454{
455 struct mount *mp;
456
457 mp = uma_zalloc(mount_zone, M_WAITOK);
458 bzero(&mp->mnt_startzero,
459 __rangeof(struct mount, mnt_startzero, mnt_endzero));
460 TAILQ_INIT(&mp->mnt_nvnodelist);
461 mp->mnt_nvnodelistsize = 0;
462 TAILQ_INIT(&mp->mnt_activevnodelist);
463 mp->mnt_activevnodelistsize = 0;
464 mp->mnt_ref = 0;
465 (void) vfs_busy(mp, MBF_NOWAIT);
466 mp->mnt_op = vfsp->vfc_vfsops;
467 mp->mnt_vfc = vfsp;
468 vfsp->vfc_refcount++; /* XXX Unlocked */
469 mp->mnt_stat.f_type = vfsp->vfc_typenum;
470 mp->mnt_gen++;
471 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
472 mp->mnt_vnodecovered = vp;
473 mp->mnt_cred = crdup(cred);
474 mp->mnt_stat.f_owner = cred->cr_uid;
475 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
476 mp->mnt_iosize_max = DFLTPHYS;
477#ifdef MAC
478 mac_mount_init(mp);
479 mac_mount_create(cred, mp);
480#endif
481 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
482 TAILQ_INIT(&mp->mnt_uppers);
483 return (mp);
484}
485
486/*
487 * Destroy the mount struct previously allocated by vfs_mount_alloc().
488 */
489void
490vfs_mount_destroy(struct mount *mp)
491{
492
493 MNT_ILOCK(mp);
494 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
495 if (mp->mnt_kern_flag & MNTK_MWAIT) {
496 mp->mnt_kern_flag &= ~MNTK_MWAIT;
497 wakeup(mp);
498 }
499 while (mp->mnt_ref)
500 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
501 KASSERT(mp->mnt_ref == 0,
502 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
503 __FILE__, __LINE__));
504 if (mp->mnt_writeopcount != 0)
505 panic("vfs_mount_destroy: nonzero writeopcount");
506 if (mp->mnt_secondary_writes != 0)
507 panic("vfs_mount_destroy: nonzero secondary_writes");
508 mp->mnt_vfc->vfc_refcount--;
509 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
510 struct vnode *vp;
511
512 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
513 vprint("", vp);
514 panic("unmount: dangling vnode");
515 }
516 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers"));
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");
523 MNT_IUNLOCK(mp);
524#ifdef MAC
525 mac_mount_destroy(mp);
526#endif
527 if (mp->mnt_opt != NULL)
528 vfs_freeopts(mp->mnt_opt);
529 crfree(mp->mnt_cred);
530 uma_zfree(mount_zone, mp);
531}
532
533int
534vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
535{
536 struct vfsoptlist *optlist;
537 struct vfsopt *opt, *tmp_opt;
538 char *fstype, *fspath, *errmsg;
539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
540
541 errmsg = fspath = NULL;
542 errmsg_len = fspathlen = 0;
543 errmsg_pos = -1;
544
545 error = vfs_buildopts(fsoptions, &optlist);
546 if (error)
547 return (error);
548
549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
551
552 /*
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.
556 */
557 fstypelen = 0;
558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
559 if (error || fstype[fstypelen - 1] != '\0') {
560 error = EINVAL;
561 if (errmsg != NULL)
562 strncpy(errmsg, "Invalid fstype", errmsg_len);
563 goto bail;
564 }
565 fspathlen = 0;
566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
567 if (error || fspath[fspathlen - 1] != '\0') {
568 error = EINVAL;
569 if (errmsg != NULL)
570 strncpy(errmsg, "Invalid fspath", errmsg_len);
571 goto bail;
572 }
573
574 /*
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.
579 */
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);
584 }
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);
590 }
591 else if (strcmp(opt->name, "reload") == 0) {
592 fsflags |= MNT_RELOAD;
593 vfs_freeopt(optlist, opt);
594 }
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);
604 }
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);
610 }
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);
616 }
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);
622 }
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);
628 }
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);
634 }
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;
645 }
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;
652 }
653
654 /*
655 * Be ultra-paranoid about making sure the type and fspath
656 * variables will fit in our mp buffers, including the
657 * terminating NUL.
658 */
659 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
660 error = ENAMETOOLONG;
661 goto bail;
662 }
663
664 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
665bail:
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) {
670 bcopy(errmsg,
671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
673 } else {
674 copyout(errmsg,
675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
677 }
678 }
679
680 if (optlist != NULL)
681 vfs_freeopts(optlist);
682 return (error);
683}
684
685/*
686 * Old mount API.
687 */
688#ifndef _SYS_SYSPROTO_H_
689struct mount_args {
690 char *type;
691 char *path;
692 int flags;
693 caddr_t data;
694};
695#endif
696/* ARGSUSED */
697int
698sys_mount(td, uap)
699 struct thread *td;
700 struct mount_args /* {
701 char *type;
702 char *path;
703 int flags;
704 caddr_t data;
705 } */ *uap;
706{
707 char *fstype;
708 struct vfsconf *vfsp = NULL;
709 struct mntarg *ma = NULL;
710 uint64_t flags;
711 int error;
712
713 /*
714 * Mount flags are now 64-bits. On 32-bit architectures only
715 * 32-bits are passed in, but from here on everything handles
716 * 64-bit flags correctly.
717 */
718 flags = uap->flags;
719
720 AUDIT_ARG_FFLAGS(flags);
721
722 /*
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
727 * root file system.
728 */
729 flags &= ~MNT_ROOTFS;
730
731 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
732 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
733 if (error) {
734 free(fstype, M_TEMP);
735 return (error);
736 }
737
738 AUDIT_ARG_TEXT(fstype);
739 mtx_lock(&Giant);
740 vfsp = vfs_byname_kld(fstype, td, &error);
741 free(fstype, M_TEMP);
742 if (vfsp == NULL) {
743 mtx_unlock(&Giant);
744 return (ENOENT);
745 }
746 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
747 mtx_unlock(&Giant);
748 return (EOPNOTSUPP);
749 }
750
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");
756
757 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
758 mtx_unlock(&Giant);
759 return (error);
760}
761
762/*
763 * vfs_domount_first(): first file system mount (not update)
764 */
765static int
766vfs_domount_first(
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. */
773 )
774{
775 struct vattr va;
776 struct mount *mp;
777 struct vnode *newdp;
778 int error;
779
780 mtx_assert(&Giant, MA_OWNED);
781 ASSERT_VOP_ELOCKED(vp, __func__);
782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
783
784 /*
785 * If the user is not root, ensure that they own the directory
786 * onto which we are attempting to mount.
787 */
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);
791 if (error == 0)
792 error = vinvalbuf(vp, V_SAVE, 0, 0);
793 if (error == 0 && vp->v_type != VDIR)
794 error = ENOTDIR;
795 if (error == 0) {
796 VI_LOCK(vp);
797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
798 vp->v_iflag |= VI_MOUNT;
799 else
800 error = EBUSY;
801 VI_UNLOCK(vp);
802 }
803 if (error != 0) {
804 vput(vp);
805 return (error);
806 }
807 VOP_UNLOCK(vp, 0);
808
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));
815
816 /*
817 * Mount the filesystem.
818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
819 * get. No freeing of cn_pnbuf.
820 */
821 error = VFS_MOUNT(mp);
822 if (error != 0) {
823 vfs_unbusy(mp);
824 vfs_mount_destroy(mp);
825 VI_LOCK(vp);
826 vp->v_iflag &= ~VI_MOUNT;
827 VI_UNLOCK(vp);
828 vrele(vp);
829 return (error);
830 }
831
832 if (mp->mnt_opt != NULL)
833 vfs_freeopts(mp->mnt_opt);
834 mp->mnt_opt = mp->mnt_optnew;
835 *optlist = NULL;
836 (void)VFS_STATFS(mp, &mp->mnt_stat);
837
838 /*
839 * Prevent external consumers of mount options from reading mnt_optnew.
840 */
841 mp->mnt_optnew = NULL;
842
843 MNT_ILOCK(mp);
844 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
845 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
846 mp->mnt_kern_flag |= MNTK_ASYNC;
847 else
848 mp->mnt_kern_flag &= ~MNTK_ASYNC;
849 MNT_IUNLOCK(mp);
850
851 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
852 cache_purge(vp);
853 VI_LOCK(vp);
854 vp->v_iflag &= ~VI_MOUNT;
855 VI_UNLOCK(vp);
856 vp->v_mountedhere = mp;
857 /* Place the new filesystem at the end of the mount list. */
858 mtx_lock(&mountlist_mtx);
859 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
860 mtx_unlock(&mountlist_mtx);
861 vfs_event_signal(NULL, VQ_MOUNT, 0);
862 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
863 panic("mount: lost mount");
864 VOP_UNLOCK(newdp, 0);
865 VOP_UNLOCK(vp, 0);
866 mountcheckdirs(vp, newdp);
867 vrele(newdp);
868 if ((mp->mnt_flag & MNT_RDONLY) == 0)
869 vfs_allocate_syncvnode(mp);
870 vfs_unbusy(mp);
871 return (0);
872}
873
874/*
875 * vfs_domount_update(): update of mounted file system
876 */
877static int
878vfs_domount_update(
879 struct thread *td, /* Calling thread. */
880 struct vnode *vp, /* Mount point vnode. */
881 uint64_t fsflags, /* Flags common to all filesystems. */
882 struct vfsoptlist **optlist /* Options local to the filesystem. */
883 )
884{
885 struct oexport_args oexport;
886 struct export_args export;
887 struct mount *mp;
888 int error, export_error;
889 uint64_t flag;
890
891 mtx_assert(&Giant, MA_OWNED);
892 ASSERT_VOP_ELOCKED(vp, __func__);
893 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
894
895 if ((vp->v_vflag & VV_ROOT) == 0) {
896 vput(vp);
897 return (EINVAL);
898 }
899 mp = vp->v_mount;
900 /*
901 * We only allow the filesystem to be reloaded if it
902 * is currently mounted read-only.
903 */
904 flag = mp->mnt_flag;
905 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
906 vput(vp);
907 return (EOPNOTSUPP); /* Needs translation */
908 }
909 /*
910 * Only privileged root, or (if MNT_USER is set) the user that
911 * did the original mount is permitted to update it.
912 */
913 error = vfs_suser(mp, td);
914 if (error != 0) {
915 vput(vp);
916 return (error);
917 }
918 if (vfs_busy(mp, MBF_NOWAIT)) {
919 vput(vp);
920 return (EBUSY);
921 }
922 VI_LOCK(vp);
923 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
924 VI_UNLOCK(vp);
925 vfs_unbusy(mp);
926 vput(vp);
927 return (EBUSY);
928 }
929 vp->v_iflag |= VI_MOUNT;
930 VI_UNLOCK(vp);
931 VOP_UNLOCK(vp, 0);
932
933 MNT_ILOCK(mp);
934 mp->mnt_flag &= ~MNT_UPDATEMASK;
935 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
936 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
937 if ((mp->mnt_flag & MNT_ASYNC) == 0)
938 mp->mnt_kern_flag &= ~MNTK_ASYNC;
939 MNT_IUNLOCK(mp);
940 mp->mnt_optnew = *optlist;
941 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
942
943 /*
944 * Mount the filesystem.
945 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
946 * get. No freeing of cn_pnbuf.
947 */
948 error = VFS_MOUNT(mp);
949
950 export_error = 0;
951 if (error == 0) {
952 /* Process the export option. */
953 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
954 sizeof(export)) == 0) {
955 export_error = vfs_export(mp, &export);
956 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
957 sizeof(oexport)) == 0) {
958 export.ex_flags = oexport.ex_flags;
959 export.ex_root = oexport.ex_root;
960 export.ex_anon = oexport.ex_anon;
961 export.ex_addr = oexport.ex_addr;
962 export.ex_addrlen = oexport.ex_addrlen;
963 export.ex_mask = oexport.ex_mask;
964 export.ex_masklen = oexport.ex_masklen;
965 export.ex_indexfile = oexport.ex_indexfile;
966 export.ex_numsecflavors = 0;
967 export_error = vfs_export(mp, &export);
968 }
969 }
970
971 MNT_ILOCK(mp);
972 if (error == 0) {
973 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
974 MNT_SNAPSHOT);
975 } else {
976 /*
977 * If we fail, restore old mount flags. MNT_QUOTA is special,
978 * because it is not part of MNT_UPDATEMASK, but it could have
979 * changed in the meantime if quotactl(2) was called.
980 * All in all we want current value of MNT_QUOTA, not the old
981 * one.
982 */
983 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
984 }
985 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
986 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
987 mp->mnt_kern_flag |= MNTK_ASYNC;
988 else
989 mp->mnt_kern_flag &= ~MNTK_ASYNC;
990 MNT_IUNLOCK(mp);
991
992 if (error != 0)
993 goto end;
994
995 if (mp->mnt_opt != NULL)
996 vfs_freeopts(mp->mnt_opt);
997 mp->mnt_opt = mp->mnt_optnew;
998 *optlist = NULL;
999 (void)VFS_STATFS(mp, &mp->mnt_stat);
1000 /*
1001 * Prevent external consumers of mount options from reading
1002 * mnt_optnew.
1003 */
1004 mp->mnt_optnew = NULL;
1005
1006 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1007 vfs_allocate_syncvnode(mp);
1008 else
1009 vfs_deallocate_syncvnode(mp);
1010end:
1011 vfs_unbusy(mp);
1012 VI_LOCK(vp);
1013 vp->v_iflag &= ~VI_MOUNT;
1014 VI_UNLOCK(vp);
1015 vrele(vp);
1016 return (error != 0 ? error : export_error);
1017}
1018
1019/*
1020 * vfs_domount(): actually attempt a filesystem mount.
1021 */
1022static int
1023vfs_domount(
1024 struct thread *td, /* Calling thread. */
1025 const char *fstype, /* Filesystem type. */
1026 char *fspath, /* Mount path. */
1027 uint64_t fsflags, /* Flags common to all filesystems. */
1028 struct vfsoptlist **optlist /* Options local to the filesystem. */
1029 )
1030{
1031 struct vfsconf *vfsp;
1032 struct nameidata nd;
1033 struct vnode *vp;
1034 char *pathbuf;
1035 int error;
1036
1037 /*
1038 * Be ultra-paranoid about making sure the type and fspath
1039 * variables will fit in our mp buffers, including the
1040 * terminating NUL.
1041 */
1042 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1043 return (ENAMETOOLONG);
1044
1045 if (jailed(td->td_ucred) || usermount == 0) {
1046 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1047 return (error);
1048 }
1049
1050 /*
1051 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1052 */
1053 if (fsflags & MNT_EXPORTED) {
1054 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1055 if (error)
1056 return (error);
1057 }
1058 if (fsflags & MNT_SUIDDIR) {
1059 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1060 if (error)
1061 return (error);
1062 }
1063 /*
1064 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1065 */
1066 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1067 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1068 fsflags |= MNT_NOSUID | MNT_USER;
1069 }
1070
1071 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1072 vfsp = NULL;
1073 if ((fsflags & MNT_UPDATE) == 0) {
1074 /* Don't try to load KLDs if we're mounting the root. */
1075 if (fsflags & MNT_ROOTFS)
1076 vfsp = vfs_byname(fstype);
1077 else
1078 vfsp = vfs_byname_kld(fstype, td, &error);
1079 if (vfsp == NULL)
1080 return (ENODEV);
1081 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1082 return (EPERM);
1083 }
1084
1085 /*
1086 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1087 */
1088 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1089 UIO_SYSSPACE, fspath, td);
1090 error = namei(&nd);
1091 if (error != 0)
1092 return (error);
1093 mtx_lock(&Giant);
1094 NDFREE(&nd, NDF_ONLY_PNBUF);
1095 vp = nd.ni_vp;
1096 if ((fsflags & MNT_UPDATE) == 0) {
1097 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1098 strcpy(pathbuf, fspath);
1099 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1100 /* debug.disablefullpath == 1 results in ENODEV */
1101 if (error == 0 || error == ENODEV) {
1102 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1103 fsflags, optlist);
1104 }
1105 free(pathbuf, M_TEMP);
1106 } else
1107 error = vfs_domount_update(td, vp, fsflags, optlist);
1108 mtx_unlock(&Giant);
1109
1110 ASSERT_VI_UNLOCKED(vp, __func__);
1111 ASSERT_VOP_UNLOCKED(vp, __func__);
1112
1113 return (error);
1114}
1115
1116/*
1117 * Unmount a filesystem.
1118 *
1119 * Note: unmount takes a path to the vnode mounted on as argument, not
1120 * special file (as before).
1121 */
1122#ifndef _SYS_SYSPROTO_H_
1123struct unmount_args {
1124 char *path;
1125 int flags;
1126};
1127#endif
1128/* ARGSUSED */
1129int
1130sys_unmount(td, uap)
1131 struct thread *td;
1132 register struct unmount_args /* {
1133 char *path;
1134 int flags;
1135 } */ *uap;
1136{
1137 struct nameidata nd;
1138 struct mount *mp;
1139 char *pathbuf;
1140 int error, id0, id1;
1141
1142 AUDIT_ARG_VALUE(uap->flags);
1143 if (jailed(td->td_ucred) || usermount == 0) {
1144 error = priv_check(td, PRIV_VFS_UNMOUNT);
1145 if (error)
1146 return (error);
1147 }
1148
1149 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1150 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1151 if (error) {
1152 free(pathbuf, M_TEMP);
1153 return (error);
1154 }
1155 mtx_lock(&Giant);
1156 if (uap->flags & MNT_BYFSID) {
1157 AUDIT_ARG_TEXT(pathbuf);
1158 /* Decode the filesystem ID. */
1159 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1160 mtx_unlock(&Giant);
1161 free(pathbuf, M_TEMP);
1162 return (EINVAL);
1163 }
1164
1165 mtx_lock(&mountlist_mtx);
1166 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1167 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1168 mp->mnt_stat.f_fsid.val[1] == id1)
1169 break;
1170 }
1171 mtx_unlock(&mountlist_mtx);
1172 } else {
1173 /*
1174 * Try to find global path for path argument.
1175 */
1176 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1177 UIO_SYSSPACE, pathbuf, td);
1178 if (namei(&nd) == 0) {
1179 NDFREE(&nd, NDF_ONLY_PNBUF);
1180 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1181 MNAMELEN);
1182 if (error == 0 || error == ENODEV)
1183 vput(nd.ni_vp);
1184 }
1185 mtx_lock(&mountlist_mtx);
1186 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1187 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1188 break;
1189 }
1190 mtx_unlock(&mountlist_mtx);
1191 }
1192 free(pathbuf, M_TEMP);
1193 if (mp == NULL) {
1194 /*
1195 * Previously we returned ENOENT for a nonexistent path and
1196 * EINVAL for a non-mountpoint. We cannot tell these apart
1197 * now, so in the !MNT_BYFSID case return the more likely
1198 * EINVAL for compatibility.
1199 */
1200 mtx_unlock(&Giant);
1201 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1202 }
1203
1204 /*
1205 * Don't allow unmounting the root filesystem.
1206 */
1207 if (mp->mnt_flag & MNT_ROOTFS) {
1208 mtx_unlock(&Giant);
1209 return (EINVAL);
1210 }
1211 error = dounmount(mp, uap->flags, td);
1212 mtx_unlock(&Giant);
1213 return (error);
1214}
1215
1216/*
1217 * Do the actual filesystem unmount.
1218 */
1219int
1220dounmount(mp, flags, td)
1221 struct mount *mp;
1222 int flags;
1223 struct thread *td;
1224{
1225 struct vnode *coveredvp, *fsrootvp;
1226 int error;
1227 uint64_t async_flag;
1228 int mnt_gen_r;
1229
1230 mtx_assert(&Giant, MA_OWNED);
1231
1232 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1233 mnt_gen_r = mp->mnt_gen;
1234 VI_LOCK(coveredvp);
1235 vholdl(coveredvp);
1236 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1237 vdrop(coveredvp);
1238 /*
1239 * Check for mp being unmounted while waiting for the
1240 * covered vnode lock.
1241 */
1242 if (coveredvp->v_mountedhere != mp ||
1243 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1244 VOP_UNLOCK(coveredvp, 0);
1245 return (EBUSY);
1246 }
1247 }
1248 /*
1249 * Only privileged root, or (if MNT_USER is set) the user that did the
1250 * original mount is permitted to unmount this filesystem.
1251 */
1252 error = vfs_suser(mp, td);
1253 if (error) {
1254 if (coveredvp)
1255 VOP_UNLOCK(coveredvp, 0);
1256 return (error);
1257 }
1258
1259 vn_start_write(NULL, &mp, V_WAIT);
1260 MNT_ILOCK(mp);
1261 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 ||
1262 !TAILQ_EMPTY(&mp->mnt_uppers)) {
1263 MNT_IUNLOCK(mp);
1264 if (coveredvp)
1265 VOP_UNLOCK(coveredvp, 0);
1266 vn_finished_write(mp);
1267 return (EBUSY);
1268 }
1269 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1270 /* Allow filesystems to detect that a forced unmount is in progress. */
1271 if (flags & MNT_FORCE)
1272 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1273 error = 0;
1274 if (mp->mnt_lockref) {
1275 mp->mnt_kern_flag |= MNTK_DRAINING;
1276 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1277 "mount drain", 0);
1278 }
1279 MNT_IUNLOCK(mp);
1280 KASSERT(mp->mnt_lockref == 0,
1281 ("%s: invalid lock refcount in the drain path @ %s:%d",
1282 __func__, __FILE__, __LINE__));
1283 KASSERT(error == 0,
1284 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1285 __func__, __FILE__, __LINE__));
1286
1287 if (mp->mnt_flag & MNT_EXPUBLIC)
1288 vfs_setpublicfs(NULL, NULL, NULL);
1289
1290 vfs_msync(mp, MNT_WAIT);
1291 MNT_ILOCK(mp);
1292 async_flag = mp->mnt_flag & MNT_ASYNC;
1293 mp->mnt_flag &= ~MNT_ASYNC;
1294 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1295 MNT_IUNLOCK(mp);
1296 cache_purgevfs(mp); /* remove cache entries for this file sys */
1297 vfs_deallocate_syncvnode(mp);
1298 /*
1299 * For forced unmounts, move process cdir/rdir refs on the fs root
1300 * vnode to the covered vnode. For non-forced unmounts we want
1301 * such references to cause an EBUSY error.
1302 */
1303 if ((flags & MNT_FORCE) &&
1304 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1305 if (mp->mnt_vnodecovered != NULL)
1306 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1307 if (fsrootvp == rootvnode) {
1308 vrele(rootvnode);
1309 rootvnode = NULL;
1310 }
1311 vput(fsrootvp);
1312 }
1313 if (((mp->mnt_flag & MNT_RDONLY) ||
1314 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0)
1315 error = VFS_UNMOUNT(mp, flags);
1316 vn_finished_write(mp);
1317 /*
1318 * If we failed to flush the dirty blocks for this mount point,
1319 * undo all the cdir/rdir and rootvnode changes we made above.
1320 * Unless we failed to do so because the device is reporting that
1321 * it doesn't exist anymore.
1322 */
1323 if (error && error != ENXIO) {
1324 if ((flags & MNT_FORCE) &&
1325 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1326 if (mp->mnt_vnodecovered != NULL)
1327 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1328 if (rootvnode == NULL) {
1329 rootvnode = fsrootvp;
1330 vref(rootvnode);
1331 }
1332 vput(fsrootvp);
1333 }
1334 MNT_ILOCK(mp);
1335 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1336 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1337 MNT_IUNLOCK(mp);
1338 vfs_allocate_syncvnode(mp);
1339 MNT_ILOCK(mp);
1340 }
1341 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1342 mp->mnt_flag |= async_flag;
1343 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1344 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1345 mp->mnt_kern_flag |= MNTK_ASYNC;
1346 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1347 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1348 wakeup(mp);
1349 }
1350 MNT_IUNLOCK(mp);
1351 if (coveredvp)
1352 VOP_UNLOCK(coveredvp, 0);
1353 return (error);
1354 }
1355 mtx_lock(&mountlist_mtx);
1356 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1357 mtx_unlock(&mountlist_mtx);
1358 if (coveredvp != NULL) {
1359 coveredvp->v_mountedhere = NULL;
1360 vput(coveredvp);
1361 }
1362 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1363 vfs_mount_destroy(mp);
1364 return (0);
1365}
1366
1367/*
1368 * Report errors during filesystem mounting.
1369 */
1370void
1371vfs_mount_error(struct mount *mp, const char *fmt, ...)
1372{
1373 struct vfsoptlist *moptlist = mp->mnt_optnew;
1374 va_list ap;
1375 int error, len;
1376 char *errmsg;
1377
1378 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1379 if (error || errmsg == NULL || len <= 0)
1380 return;
1381
1382 va_start(ap, fmt);
1383 vsnprintf(errmsg, (size_t)len, fmt, ap);
1384 va_end(ap);
1385}
1386
1387void
1388vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1389{
1390 va_list ap;
1391 int error, len;
1392 char *errmsg;
1393
1394 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1395 if (error || errmsg == NULL || len <= 0)
1396 return;
1397
1398 va_start(ap, fmt);
1399 vsnprintf(errmsg, (size_t)len, fmt, ap);
1400 va_end(ap);
1401}
1402
1403/*
1404 * ---------------------------------------------------------------------
1405 * Functions for querying mount options/arguments from filesystems.
1406 */
1407
1408/*
1409 * Check that no unknown options are given
1410 */
1411int
1412vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1413{
1414 struct vfsopt *opt;
1415 char errmsg[255];
1416 const char **t, *p, *q;
1417 int ret = 0;
1418
1419 TAILQ_FOREACH(opt, opts, link) {
1420 p = opt->name;
1421 q = NULL;
1422 if (p[0] == 'n' && p[1] == 'o')
1423 q = p + 2;
1424 for(t = global_opts; *t != NULL; t++) {
1425 if (strcmp(*t, p) == 0)
1426 break;
1427 if (q != NULL) {
1428 if (strcmp(*t, q) == 0)
1429 break;
1430 }
1431 }
1432 if (*t != NULL)
1433 continue;
1434 for(t = legal; *t != NULL; t++) {
1435 if (strcmp(*t, p) == 0)
1436 break;
1437 if (q != NULL) {
1438 if (strcmp(*t, q) == 0)
1439 break;
1440 }
1441 }
1442 if (*t != NULL)
1443 continue;
1444 snprintf(errmsg, sizeof(errmsg),
1445 "mount option <%s> is unknown", p);
1446 ret = EINVAL;
1447 }
1448 if (ret != 0) {
1449 TAILQ_FOREACH(opt, opts, link) {
1450 if (strcmp(opt->name, "errmsg") == 0) {
1451 strncpy((char *)opt->value, errmsg, opt->len);
1452 break;
1453 }
1454 }
1455 if (opt == NULL)
1456 printf("%s\n", errmsg);
1457 }
1458 return (ret);
1459}
1460
1461/*
1462 * Get a mount option by its name.
1463 *
1464 * Return 0 if the option was found, ENOENT otherwise.
1465 * If len is non-NULL it will be filled with the length
1466 * of the option. If buf is non-NULL, it will be filled
1467 * with the address of the option.
1468 */
1469int
1470vfs_getopt(opts, name, buf, len)
1471 struct vfsoptlist *opts;
1472 const char *name;
1473 void **buf;
1474 int *len;
1475{
1476 struct vfsopt *opt;
1477
1478 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1479
1480 TAILQ_FOREACH(opt, opts, link) {
1481 if (strcmp(name, opt->name) == 0) {
1482 opt->seen = 1;
1483 if (len != NULL)
1484 *len = opt->len;
1485 if (buf != NULL)
1486 *buf = opt->value;
1487 return (0);
1488 }
1489 }
1490 return (ENOENT);
1491}
1492
1493int
1494vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1495{
1496 struct vfsopt *opt;
1497
1498 if (opts == NULL)
1499 return (-1);
1500
1501 TAILQ_FOREACH(opt, opts, link) {
1502 if (strcmp(name, opt->name) == 0) {
1503 opt->seen = 1;
1504 return (opt->pos);
1505 }
1506 }
1507 return (-1);
1508}
1509
1510int
1511vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1512{
1513 char *opt_value, *vtp;
1514 quad_t iv;
1515 int error, opt_len;
1516
1517 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1518 if (error != 0)
1519 return (error);
1520 if (opt_len == 0 || opt_value == NULL)
1521 return (EINVAL);
1522 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1523 return (EINVAL);
1524 iv = strtoq(opt_value, &vtp, 0);
1525 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1526 return (EINVAL);
1527 if (iv < 0)
1528 return (EINVAL);
1529 switch (vtp[0]) {
1530 case 't':
1531 case 'T':
1532 iv *= 1024;
1533 case 'g':
1534 case 'G':
1535 iv *= 1024;
1536 case 'm':
1537 case 'M':
1538 iv *= 1024;
1539 case 'k':
1540 case 'K':
1541 iv *= 1024;
1542 case '\0':
1543 break;
1544 default:
1545 return (EINVAL);
1546 }
1547 *value = iv;
1548
1549 return (0);
1550}
1551
1552char *
1553vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1554{
1555 struct vfsopt *opt;
1556
1557 *error = 0;
1558 TAILQ_FOREACH(opt, opts, link) {
1559 if (strcmp(name, opt->name) != 0)
1560 continue;
1561 opt->seen = 1;
1562 if (opt->len == 0 ||
1563 ((char *)opt->value)[opt->len - 1] != '\0') {
1564 *error = EINVAL;
1565 return (NULL);
1566 }
1567 return (opt->value);
1568 }
1569 *error = ENOENT;
1570 return (NULL);
1571}
1572
1573int
1574vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1575 uint64_t val)
1576{
1577 struct vfsopt *opt;
1578
1579 TAILQ_FOREACH(opt, opts, link) {
1580 if (strcmp(name, opt->name) == 0) {
1581 opt->seen = 1;
1582 if (w != NULL)
1583 *w |= val;
1584 return (1);
1585 }
1586 }
1587 if (w != NULL)
1588 *w &= ~val;
1589 return (0);
1590}
1591
1592int
1593vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1594{
1595 va_list ap;
1596 struct vfsopt *opt;
1597 int ret;
1598
1599 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1600
1601 TAILQ_FOREACH(opt, opts, link) {
1602 if (strcmp(name, opt->name) != 0)
1603 continue;
1604 opt->seen = 1;
1605 if (opt->len == 0 || opt->value == NULL)
1606 return (0);
1607 if (((char *)opt->value)[opt->len - 1] != '\0')
1608 return (0);
1609 va_start(ap, fmt);
1610 ret = vsscanf(opt->value, fmt, ap);
1611 va_end(ap);
1612 return (ret);
1613 }
1614 return (0);
1615}
1616
1617int
1618vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1619{
1620 struct vfsopt *opt;
1621
1622 TAILQ_FOREACH(opt, opts, link) {
1623 if (strcmp(name, opt->name) != 0)
1624 continue;
1625 opt->seen = 1;
1626 if (opt->value == NULL)
1627 opt->len = len;
1628 else {
1629 if (opt->len != len)
1630 return (EINVAL);
1631 bcopy(value, opt->value, len);
1632 }
1633 return (0);
1634 }
1635 return (ENOENT);
1636}
1637
1638int
1639vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1640{
1641 struct vfsopt *opt;
1642
1643 TAILQ_FOREACH(opt, opts, link) {
1644 if (strcmp(name, opt->name) != 0)
1645 continue;
1646 opt->seen = 1;
1647 if (opt->value == NULL)
1648 opt->len = len;
1649 else {
1650 if (opt->len < len)
1651 return (EINVAL);
1652 opt->len = len;
1653 bcopy(value, opt->value, len);
1654 }
1655 return (0);
1656 }
1657 return (ENOENT);
1658}
1659
1660int
1661vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1662{
1663 struct vfsopt *opt;
1664
1665 TAILQ_FOREACH(opt, opts, link) {
1666 if (strcmp(name, opt->name) != 0)
1667 continue;
1668 opt->seen = 1;
1669 if (opt->value == NULL)
1670 opt->len = strlen(value) + 1;
1671 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1672 return (EINVAL);
1673 return (0);
1674 }
1675 return (ENOENT);
1676}
1677
1678/*
1679 * Find and copy a mount option.
1680 *
1681 * The size of the buffer has to be specified
1682 * in len, if it is not the same length as the
1683 * mount option, EINVAL is returned.
1684 * Returns ENOENT if the option is not found.
1685 */
1686int
1687vfs_copyopt(opts, name, dest, len)
1688 struct vfsoptlist *opts;
1689 const char *name;
1690 void *dest;
1691 int len;
1692{
1693 struct vfsopt *opt;
1694
1695 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1696
1697 TAILQ_FOREACH(opt, opts, link) {
1698 if (strcmp(name, opt->name) == 0) {
1699 opt->seen = 1;
1700 if (len != opt->len)
1701 return (EINVAL);
1702 bcopy(opt->value, dest, opt->len);
1703 return (0);
1704 }
1705 }
1706 return (ENOENT);
1707}
1708
1709int
1710__vfs_statfs(struct mount *mp, struct statfs *sbp)
1711{
1712 int error;
1713
1714 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1715 if (sbp != &mp->mnt_stat)
1716 *sbp = mp->mnt_stat;
1717 return (error);
1718}
1719
1720void
1721vfs_mountedfrom(struct mount *mp, const char *from)
1722{
1723
1724 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1725 strlcpy(mp->mnt_stat.f_mntfromname, from,
1726 sizeof mp->mnt_stat.f_mntfromname);
1727}
1728
1729/*
1730 * ---------------------------------------------------------------------
1731 * This is the api for building mount args and mounting filesystems from
1732 * inside the kernel.
1733 *
1734 * The API works by accumulation of individual args. First error is
1735 * latched.
1736 *
1737 * XXX: should be documented in new manpage kernel_mount(9)
1738 */
1739
1740/* A memory allocation which must be freed when we are done */
1741struct mntaarg {
1742 SLIST_ENTRY(mntaarg) next;
1743};
1744
1745/* The header for the mount arguments */
1746struct mntarg {
1747 struct iovec *v;
1748 int len;
1749 int error;
1750 SLIST_HEAD(, mntaarg) list;
1751};
1752
1753/*
1754 * Add a boolean argument.
1755 *
1756 * flag is the boolean value.
1757 * name must start with "no".
1758 */
1759struct mntarg *
1760mount_argb(struct mntarg *ma, int flag, const char *name)
1761{
1762
1763 KASSERT(name[0] == 'n' && name[1] == 'o',
1764 ("mount_argb(...,%s): name must start with 'no'", name));
1765
1766 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1767}
1768
1769/*
1770 * Add an argument printf style
1771 */
1772struct mntarg *
1773mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1774{
1775 va_list ap;
1776 struct mntaarg *maa;
1777 struct sbuf *sb;
1778 int len;
1779
1780 if (ma == NULL) {
1781 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1782 SLIST_INIT(&ma->list);
1783 }
1784 if (ma->error)
1785 return (ma);
1786
1787 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1788 M_MOUNT, M_WAITOK);
1789 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1790 ma->v[ma->len].iov_len = strlen(name) + 1;
1791 ma->len++;
1792
1793 sb = sbuf_new_auto();
1794 va_start(ap, fmt);
1795 sbuf_vprintf(sb, fmt, ap);
1796 va_end(ap);
1797 sbuf_finish(sb);
1798 len = sbuf_len(sb) + 1;
1799 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1800 SLIST_INSERT_HEAD(&ma->list, maa, next);
1801 bcopy(sbuf_data(sb), maa + 1, len);
1802 sbuf_delete(sb);
1803
1804 ma->v[ma->len].iov_base = maa + 1;
1805 ma->v[ma->len].iov_len = len;
1806 ma->len++;
1807
1808 return (ma);
1809}
1810
1811/*
1812 * Add an argument which is a userland string.
1813 */
1814struct mntarg *
1815mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1816{
1817 struct mntaarg *maa;
1818 char *tbuf;
1819
1820 if (val == NULL)
1821 return (ma);
1822 if (ma == NULL) {
1823 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1824 SLIST_INIT(&ma->list);
1825 }
1826 if (ma->error)
1827 return (ma);
1828 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1829 SLIST_INSERT_HEAD(&ma->list, maa, next);
1830 tbuf = (void *)(maa + 1);
1831 ma->error = copyinstr(val, tbuf, len, NULL);
1832 return (mount_arg(ma, name, tbuf, -1));
1833}
1834
1835/*
1836 * Plain argument.
1837 *
1838 * If length is -1, treat value as a C string.
1839 */
1840struct mntarg *
1841mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1842{
1843
1844 if (ma == NULL) {
1845 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1846 SLIST_INIT(&ma->list);
1847 }
1848 if (ma->error)
1849 return (ma);
1850
1851 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1852 M_MOUNT, M_WAITOK);
1853 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1854 ma->v[ma->len].iov_len = strlen(name) + 1;
1855 ma->len++;
1856
1857 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1858 if (len < 0)
1859 ma->v[ma->len].iov_len = strlen(val) + 1;
1860 else
1861 ma->v[ma->len].iov_len = len;
1862 ma->len++;
1863 return (ma);
1864}
1865
1866/*
1867 * Free a mntarg structure
1868 */
1869static void
1870free_mntarg(struct mntarg *ma)
1871{
1872 struct mntaarg *maa;
1873
1874 while (!SLIST_EMPTY(&ma->list)) {
1875 maa = SLIST_FIRST(&ma->list);
1876 SLIST_REMOVE_HEAD(&ma->list, next);
1877 free(maa, M_MOUNT);
1878 }
1879 free(ma->v, M_MOUNT);
1880 free(ma, M_MOUNT);
1881}
1882
1883/*
1884 * Mount a filesystem
1885 */
1886int
1887kernel_mount(struct mntarg *ma, uint64_t flags)
1888{
1889 struct uio auio;
1890 int error;
1891
1892 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
1893 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
1894 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
1895
1896 auio.uio_iov = ma->v;
1897 auio.uio_iovcnt = ma->len;
1898 auio.uio_segflg = UIO_SYSSPACE;
1899
1900 error = ma->error;
1901 if (!error)
1902 error = vfs_donmount(curthread, flags, &auio);
1903 free_mntarg(ma);
1904 return (error);
1905}
1906
1907/*
1908 * A printflike function to mount a filesystem.
1909 */
1910int
1911kernel_vmount(int flags, ...)
1912{
1913 struct mntarg *ma = NULL;
1914 va_list ap;
1915 const char *cp;
1916 const void *vp;
1917 int error;
1918
1919 va_start(ap, flags);
1920 for (;;) {
1921 cp = va_arg(ap, const char *);
1922 if (cp == NULL)
1923 break;
1924 vp = va_arg(ap, const void *);
1925 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
1926 }
1927 va_end(ap);
1928
1929 error = kernel_mount(ma, flags);
1930 return (error);
1931}
1932
1933void
1934vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
1935{
1936
1937 bcopy(oexp, exp, sizeof(*oexp));
1938 exp->ex_numsecflavors = 0;
1939}
| 236 */
237static void
238vfs_sanitizeopts(struct vfsoptlist *opts)
239{
240 struct vfsopt *opt, *opt2, *tmp;
241
242 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
243 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
244 while (opt2 != NULL) {
245 if (vfs_equalopts(opt->name, opt2->name)) {
246 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
247 vfs_freeopt(opts, opt2);
248 opt2 = tmp;
249 } else {
250 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
251 }
252 }
253 }
254}
255
256/*
257 * Build a linked list of mount options from a struct uio.
258 */
259int
260vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
261{
262 struct vfsoptlist *opts;
263 struct vfsopt *opt;
264 size_t memused, namelen, optlen;
265 unsigned int i, iovcnt;
266 int error;
267
268 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
269 TAILQ_INIT(opts);
270 memused = 0;
271 iovcnt = auio->uio_iovcnt;
272 for (i = 0; i < iovcnt; i += 2) {
273 namelen = auio->uio_iov[i].iov_len;
274 optlen = auio->uio_iov[i + 1].iov_len;
275 memused += sizeof(struct vfsopt) + optlen + namelen;
276 /*
277 * Avoid consuming too much memory, and attempts to overflow
278 * memused.
279 */
280 if (memused > VFS_MOUNTARG_SIZE_MAX ||
281 optlen > VFS_MOUNTARG_SIZE_MAX ||
282 namelen > VFS_MOUNTARG_SIZE_MAX) {
283 error = EINVAL;
284 goto bad;
285 }
286
287 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
288 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
289 opt->value = NULL;
290 opt->len = 0;
291 opt->pos = i / 2;
292 opt->seen = 0;
293
294 /*
295 * Do this early, so jumps to "bad" will free the current
296 * option.
297 */
298 TAILQ_INSERT_TAIL(opts, opt, link);
299
300 if (auio->uio_segflg == UIO_SYSSPACE) {
301 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
302 } else {
303 error = copyin(auio->uio_iov[i].iov_base, opt->name,
304 namelen);
305 if (error)
306 goto bad;
307 }
308 /* Ensure names are null-terminated strings. */
309 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
310 error = EINVAL;
311 goto bad;
312 }
313 if (optlen != 0) {
314 opt->len = optlen;
315 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
316 if (auio->uio_segflg == UIO_SYSSPACE) {
317 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
318 optlen);
319 } else {
320 error = copyin(auio->uio_iov[i + 1].iov_base,
321 opt->value, optlen);
322 if (error)
323 goto bad;
324 }
325 }
326 }
327 vfs_sanitizeopts(opts);
328 *options = opts;
329 return (0);
330bad:
331 vfs_freeopts(opts);
332 return (error);
333}
334
335/*
336 * Merge the old mount options with the new ones passed
337 * in the MNT_UPDATE case.
338 *
339 * XXX: This function will keep a "nofoo" option in the new
340 * options. E.g, if the option's canonical name is "foo",
341 * "nofoo" ends up in the mount point's active options.
342 */
343static void
344vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
345{
346 struct vfsopt *opt, *new;
347
348 TAILQ_FOREACH(opt, oldopts, link) {
349 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
350 new->name = strdup(opt->name, M_MOUNT);
351 if (opt->len != 0) {
352 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
353 bcopy(opt->value, new->value, opt->len);
354 } else
355 new->value = NULL;
356 new->len = opt->len;
357 new->seen = opt->seen;
358 TAILQ_INSERT_HEAD(toopts, new, link);
359 }
360 vfs_sanitizeopts(toopts);
361}
362
363/*
364 * Mount a filesystem.
365 */
366int
367sys_nmount(td, uap)
368 struct thread *td;
369 struct nmount_args /* {
370 struct iovec *iovp;
371 unsigned int iovcnt;
372 int flags;
373 } */ *uap;
374{
375 struct uio *auio;
376 int error;
377 u_int iovcnt;
378 uint64_t flags;
379
380 /*
381 * Mount flags are now 64-bits. On 32-bit archtectures only
382 * 32-bits are passed in, but from here on everything handles
383 * 64-bit flags correctly.
384 */
385 flags = uap->flags;
386
387 AUDIT_ARG_FFLAGS(flags);
388 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
389 uap->iovp, uap->iovcnt, flags);
390
391 /*
392 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
393 * userspace to set this flag, but we must filter it out if we want
394 * MNT_UPDATE on the root file system to work.
395 * MNT_ROOTFS should only be set by the kernel when mounting its
396 * root file system.
397 */
398 flags &= ~MNT_ROOTFS;
399
400 iovcnt = uap->iovcnt;
401 /*
402 * Check that we have an even number of iovec's
403 * and that we have at least two options.
404 */
405 if ((iovcnt & 1) || (iovcnt < 4)) {
406 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
407 uap->iovcnt);
408 return (EINVAL);
409 }
410
411 error = copyinuio(uap->iovp, iovcnt, &auio);
412 if (error) {
413 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
414 __func__, error);
415 return (error);
416 }
417 error = vfs_donmount(td, flags, auio);
418
419 free(auio, M_IOV);
420 return (error);
421}
422
423/*
424 * ---------------------------------------------------------------------
425 * Various utility functions
426 */
427
428void
429vfs_ref(struct mount *mp)
430{
431
432 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
433 MNT_ILOCK(mp);
434 MNT_REF(mp);
435 MNT_IUNLOCK(mp);
436}
437
438void
439vfs_rel(struct mount *mp)
440{
441
442 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
443 MNT_ILOCK(mp);
444 MNT_REL(mp);
445 MNT_IUNLOCK(mp);
446}
447
448/*
449 * Allocate and initialize the mount point struct.
450 */
451struct mount *
452vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
453 struct ucred *cred)
454{
455 struct mount *mp;
456
457 mp = uma_zalloc(mount_zone, M_WAITOK);
458 bzero(&mp->mnt_startzero,
459 __rangeof(struct mount, mnt_startzero, mnt_endzero));
460 TAILQ_INIT(&mp->mnt_nvnodelist);
461 mp->mnt_nvnodelistsize = 0;
462 TAILQ_INIT(&mp->mnt_activevnodelist);
463 mp->mnt_activevnodelistsize = 0;
464 mp->mnt_ref = 0;
465 (void) vfs_busy(mp, MBF_NOWAIT);
466 mp->mnt_op = vfsp->vfc_vfsops;
467 mp->mnt_vfc = vfsp;
468 vfsp->vfc_refcount++; /* XXX Unlocked */
469 mp->mnt_stat.f_type = vfsp->vfc_typenum;
470 mp->mnt_gen++;
471 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
472 mp->mnt_vnodecovered = vp;
473 mp->mnt_cred = crdup(cred);
474 mp->mnt_stat.f_owner = cred->cr_uid;
475 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
476 mp->mnt_iosize_max = DFLTPHYS;
477#ifdef MAC
478 mac_mount_init(mp);
479 mac_mount_create(cred, mp);
480#endif
481 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
482 TAILQ_INIT(&mp->mnt_uppers);
483 return (mp);
484}
485
486/*
487 * Destroy the mount struct previously allocated by vfs_mount_alloc().
488 */
489void
490vfs_mount_destroy(struct mount *mp)
491{
492
493 MNT_ILOCK(mp);
494 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
495 if (mp->mnt_kern_flag & MNTK_MWAIT) {
496 mp->mnt_kern_flag &= ~MNTK_MWAIT;
497 wakeup(mp);
498 }
499 while (mp->mnt_ref)
500 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
501 KASSERT(mp->mnt_ref == 0,
502 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
503 __FILE__, __LINE__));
504 if (mp->mnt_writeopcount != 0)
505 panic("vfs_mount_destroy: nonzero writeopcount");
506 if (mp->mnt_secondary_writes != 0)
507 panic("vfs_mount_destroy: nonzero secondary_writes");
508 mp->mnt_vfc->vfc_refcount--;
509 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
510 struct vnode *vp;
511
512 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
513 vprint("", vp);
514 panic("unmount: dangling vnode");
515 }
516 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers"));
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");
523 MNT_IUNLOCK(mp);
524#ifdef MAC
525 mac_mount_destroy(mp);
526#endif
527 if (mp->mnt_opt != NULL)
528 vfs_freeopts(mp->mnt_opt);
529 crfree(mp->mnt_cred);
530 uma_zfree(mount_zone, mp);
531}
532
533int
534vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
535{
536 struct vfsoptlist *optlist;
537 struct vfsopt *opt, *tmp_opt;
538 char *fstype, *fspath, *errmsg;
539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
540
541 errmsg = fspath = NULL;
542 errmsg_len = fspathlen = 0;
543 errmsg_pos = -1;
544
545 error = vfs_buildopts(fsoptions, &optlist);
546 if (error)
547 return (error);
548
549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
551
552 /*
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.
556 */
557 fstypelen = 0;
558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
559 if (error || fstype[fstypelen - 1] != '\0') {
560 error = EINVAL;
561 if (errmsg != NULL)
562 strncpy(errmsg, "Invalid fstype", errmsg_len);
563 goto bail;
564 }
565 fspathlen = 0;
566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
567 if (error || fspath[fspathlen - 1] != '\0') {
568 error = EINVAL;
569 if (errmsg != NULL)
570 strncpy(errmsg, "Invalid fspath", errmsg_len);
571 goto bail;
572 }
573
574 /*
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.
579 */
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);
584 }
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);
590 }
591 else if (strcmp(opt->name, "reload") == 0) {
592 fsflags |= MNT_RELOAD;
593 vfs_freeopt(optlist, opt);
594 }
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);
604 }
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);
610 }
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);
616 }
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);
622 }
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);
628 }
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);
634 }
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;
645 }
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;
652 }
653
654 /*
655 * Be ultra-paranoid about making sure the type and fspath
656 * variables will fit in our mp buffers, including the
657 * terminating NUL.
658 */
659 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
660 error = ENAMETOOLONG;
661 goto bail;
662 }
663
664 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
665bail:
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) {
670 bcopy(errmsg,
671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
673 } else {
674 copyout(errmsg,
675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
677 }
678 }
679
680 if (optlist != NULL)
681 vfs_freeopts(optlist);
682 return (error);
683}
684
685/*
686 * Old mount API.
687 */
688#ifndef _SYS_SYSPROTO_H_
689struct mount_args {
690 char *type;
691 char *path;
692 int flags;
693 caddr_t data;
694};
695#endif
696/* ARGSUSED */
697int
698sys_mount(td, uap)
699 struct thread *td;
700 struct mount_args /* {
701 char *type;
702 char *path;
703 int flags;
704 caddr_t data;
705 } */ *uap;
706{
707 char *fstype;
708 struct vfsconf *vfsp = NULL;
709 struct mntarg *ma = NULL;
710 uint64_t flags;
711 int error;
712
713 /*
714 * Mount flags are now 64-bits. On 32-bit architectures only
715 * 32-bits are passed in, but from here on everything handles
716 * 64-bit flags correctly.
717 */
718 flags = uap->flags;
719
720 AUDIT_ARG_FFLAGS(flags);
721
722 /*
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
727 * root file system.
728 */
729 flags &= ~MNT_ROOTFS;
730
731 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
732 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
733 if (error) {
734 free(fstype, M_TEMP);
735 return (error);
736 }
737
738 AUDIT_ARG_TEXT(fstype);
739 mtx_lock(&Giant);
740 vfsp = vfs_byname_kld(fstype, td, &error);
741 free(fstype, M_TEMP);
742 if (vfsp == NULL) {
743 mtx_unlock(&Giant);
744 return (ENOENT);
745 }
746 if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
747 mtx_unlock(&Giant);
748 return (EOPNOTSUPP);
749 }
750
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");
756
757 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
758 mtx_unlock(&Giant);
759 return (error);
760}
761
762/*
763 * vfs_domount_first(): first file system mount (not update)
764 */
765static int
766vfs_domount_first(
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. */
773 )
774{
775 struct vattr va;
776 struct mount *mp;
777 struct vnode *newdp;
778 int error;
779
780 mtx_assert(&Giant, MA_OWNED);
781 ASSERT_VOP_ELOCKED(vp, __func__);
782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
783
784 /*
785 * If the user is not root, ensure that they own the directory
786 * onto which we are attempting to mount.
787 */
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);
791 if (error == 0)
792 error = vinvalbuf(vp, V_SAVE, 0, 0);
793 if (error == 0 && vp->v_type != VDIR)
794 error = ENOTDIR;
795 if (error == 0) {
796 VI_LOCK(vp);
797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
798 vp->v_iflag |= VI_MOUNT;
799 else
800 error = EBUSY;
801 VI_UNLOCK(vp);
802 }
803 if (error != 0) {
804 vput(vp);
805 return (error);
806 }
807 VOP_UNLOCK(vp, 0);
808
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));
815
816 /*
817 * Mount the filesystem.
818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
819 * get. No freeing of cn_pnbuf.
820 */
821 error = VFS_MOUNT(mp);
822 if (error != 0) {
823 vfs_unbusy(mp);
824 vfs_mount_destroy(mp);
825 VI_LOCK(vp);
826 vp->v_iflag &= ~VI_MOUNT;
827 VI_UNLOCK(vp);
828 vrele(vp);
829 return (error);
830 }
831
832 if (mp->mnt_opt != NULL)
833 vfs_freeopts(mp->mnt_opt);
834 mp->mnt_opt = mp->mnt_optnew;
835 *optlist = NULL;
836 (void)VFS_STATFS(mp, &mp->mnt_stat);
837
838 /*
839 * Prevent external consumers of mount options from reading mnt_optnew.
840 */
841 mp->mnt_optnew = NULL;
842
843 MNT_ILOCK(mp);
844 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
845 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
846 mp->mnt_kern_flag |= MNTK_ASYNC;
847 else
848 mp->mnt_kern_flag &= ~MNTK_ASYNC;
849 MNT_IUNLOCK(mp);
850
851 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
852 cache_purge(vp);
853 VI_LOCK(vp);
854 vp->v_iflag &= ~VI_MOUNT;
855 VI_UNLOCK(vp);
856 vp->v_mountedhere = mp;
857 /* Place the new filesystem at the end of the mount list. */
858 mtx_lock(&mountlist_mtx);
859 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
860 mtx_unlock(&mountlist_mtx);
861 vfs_event_signal(NULL, VQ_MOUNT, 0);
862 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
863 panic("mount: lost mount");
864 VOP_UNLOCK(newdp, 0);
865 VOP_UNLOCK(vp, 0);
866 mountcheckdirs(vp, newdp);
867 vrele(newdp);
868 if ((mp->mnt_flag & MNT_RDONLY) == 0)
869 vfs_allocate_syncvnode(mp);
870 vfs_unbusy(mp);
871 return (0);
872}
873
874/*
875 * vfs_domount_update(): update of mounted file system
876 */
877static int
878vfs_domount_update(
879 struct thread *td, /* Calling thread. */
880 struct vnode *vp, /* Mount point vnode. */
881 uint64_t fsflags, /* Flags common to all filesystems. */
882 struct vfsoptlist **optlist /* Options local to the filesystem. */
883 )
884{
885 struct oexport_args oexport;
886 struct export_args export;
887 struct mount *mp;
888 int error, export_error;
889 uint64_t flag;
890
891 mtx_assert(&Giant, MA_OWNED);
892 ASSERT_VOP_ELOCKED(vp, __func__);
893 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
894
895 if ((vp->v_vflag & VV_ROOT) == 0) {
896 vput(vp);
897 return (EINVAL);
898 }
899 mp = vp->v_mount;
900 /*
901 * We only allow the filesystem to be reloaded if it
902 * is currently mounted read-only.
903 */
904 flag = mp->mnt_flag;
905 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
906 vput(vp);
907 return (EOPNOTSUPP); /* Needs translation */
908 }
909 /*
910 * Only privileged root, or (if MNT_USER is set) the user that
911 * did the original mount is permitted to update it.
912 */
913 error = vfs_suser(mp, td);
914 if (error != 0) {
915 vput(vp);
916 return (error);
917 }
918 if (vfs_busy(mp, MBF_NOWAIT)) {
919 vput(vp);
920 return (EBUSY);
921 }
922 VI_LOCK(vp);
923 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
924 VI_UNLOCK(vp);
925 vfs_unbusy(mp);
926 vput(vp);
927 return (EBUSY);
928 }
929 vp->v_iflag |= VI_MOUNT;
930 VI_UNLOCK(vp);
931 VOP_UNLOCK(vp, 0);
932
933 MNT_ILOCK(mp);
934 mp->mnt_flag &= ~MNT_UPDATEMASK;
935 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
936 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
937 if ((mp->mnt_flag & MNT_ASYNC) == 0)
938 mp->mnt_kern_flag &= ~MNTK_ASYNC;
939 MNT_IUNLOCK(mp);
940 mp->mnt_optnew = *optlist;
941 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
942
943 /*
944 * Mount the filesystem.
945 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
946 * get. No freeing of cn_pnbuf.
947 */
948 error = VFS_MOUNT(mp);
949
950 export_error = 0;
951 if (error == 0) {
952 /* Process the export option. */
953 if (vfs_copyopt(mp->mnt_optnew, "export", &export,
954 sizeof(export)) == 0) {
955 export_error = vfs_export(mp, &export);
956 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
957 sizeof(oexport)) == 0) {
958 export.ex_flags = oexport.ex_flags;
959 export.ex_root = oexport.ex_root;
960 export.ex_anon = oexport.ex_anon;
961 export.ex_addr = oexport.ex_addr;
962 export.ex_addrlen = oexport.ex_addrlen;
963 export.ex_mask = oexport.ex_mask;
964 export.ex_masklen = oexport.ex_masklen;
965 export.ex_indexfile = oexport.ex_indexfile;
966 export.ex_numsecflavors = 0;
967 export_error = vfs_export(mp, &export);
968 }
969 }
970
971 MNT_ILOCK(mp);
972 if (error == 0) {
973 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
974 MNT_SNAPSHOT);
975 } else {
976 /*
977 * If we fail, restore old mount flags. MNT_QUOTA is special,
978 * because it is not part of MNT_UPDATEMASK, but it could have
979 * changed in the meantime if quotactl(2) was called.
980 * All in all we want current value of MNT_QUOTA, not the old
981 * one.
982 */
983 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
984 }
985 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
986 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
987 mp->mnt_kern_flag |= MNTK_ASYNC;
988 else
989 mp->mnt_kern_flag &= ~MNTK_ASYNC;
990 MNT_IUNLOCK(mp);
991
992 if (error != 0)
993 goto end;
994
995 if (mp->mnt_opt != NULL)
996 vfs_freeopts(mp->mnt_opt);
997 mp->mnt_opt = mp->mnt_optnew;
998 *optlist = NULL;
999 (void)VFS_STATFS(mp, &mp->mnt_stat);
1000 /*
1001 * Prevent external consumers of mount options from reading
1002 * mnt_optnew.
1003 */
1004 mp->mnt_optnew = NULL;
1005
1006 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1007 vfs_allocate_syncvnode(mp);
1008 else
1009 vfs_deallocate_syncvnode(mp);
1010end:
1011 vfs_unbusy(mp);
1012 VI_LOCK(vp);
1013 vp->v_iflag &= ~VI_MOUNT;
1014 VI_UNLOCK(vp);
1015 vrele(vp);
1016 return (error != 0 ? error : export_error);
1017}
1018
1019/*
1020 * vfs_domount(): actually attempt a filesystem mount.
1021 */
1022static int
1023vfs_domount(
1024 struct thread *td, /* Calling thread. */
1025 const char *fstype, /* Filesystem type. */
1026 char *fspath, /* Mount path. */
1027 uint64_t fsflags, /* Flags common to all filesystems. */
1028 struct vfsoptlist **optlist /* Options local to the filesystem. */
1029 )
1030{
1031 struct vfsconf *vfsp;
1032 struct nameidata nd;
1033 struct vnode *vp;
1034 char *pathbuf;
1035 int error;
1036
1037 /*
1038 * Be ultra-paranoid about making sure the type and fspath
1039 * variables will fit in our mp buffers, including the
1040 * terminating NUL.
1041 */
1042 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1043 return (ENAMETOOLONG);
1044
1045 if (jailed(td->td_ucred) || usermount == 0) {
1046 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1047 return (error);
1048 }
1049
1050 /*
1051 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1052 */
1053 if (fsflags & MNT_EXPORTED) {
1054 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1055 if (error)
1056 return (error);
1057 }
1058 if (fsflags & MNT_SUIDDIR) {
1059 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1060 if (error)
1061 return (error);
1062 }
1063 /*
1064 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1065 */
1066 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1067 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1068 fsflags |= MNT_NOSUID | MNT_USER;
1069 }
1070
1071 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1072 vfsp = NULL;
1073 if ((fsflags & MNT_UPDATE) == 0) {
1074 /* Don't try to load KLDs if we're mounting the root. */
1075 if (fsflags & MNT_ROOTFS)
1076 vfsp = vfs_byname(fstype);
1077 else
1078 vfsp = vfs_byname_kld(fstype, td, &error);
1079 if (vfsp == NULL)
1080 return (ENODEV);
1081 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1082 return (EPERM);
1083 }
1084
1085 /*
1086 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1087 */
1088 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1089 UIO_SYSSPACE, fspath, td);
1090 error = namei(&nd);
1091 if (error != 0)
1092 return (error);
1093 mtx_lock(&Giant);
1094 NDFREE(&nd, NDF_ONLY_PNBUF);
1095 vp = nd.ni_vp;
1096 if ((fsflags & MNT_UPDATE) == 0) {
1097 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1098 strcpy(pathbuf, fspath);
1099 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1100 /* debug.disablefullpath == 1 results in ENODEV */
1101 if (error == 0 || error == ENODEV) {
1102 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1103 fsflags, optlist);
1104 }
1105 free(pathbuf, M_TEMP);
1106 } else
1107 error = vfs_domount_update(td, vp, fsflags, optlist);
1108 mtx_unlock(&Giant);
1109
1110 ASSERT_VI_UNLOCKED(vp, __func__);
1111 ASSERT_VOP_UNLOCKED(vp, __func__);
1112
1113 return (error);
1114}
1115
1116/*
1117 * Unmount a filesystem.
1118 *
1119 * Note: unmount takes a path to the vnode mounted on as argument, not
1120 * special file (as before).
1121 */
1122#ifndef _SYS_SYSPROTO_H_
1123struct unmount_args {
1124 char *path;
1125 int flags;
1126};
1127#endif
1128/* ARGSUSED */
1129int
1130sys_unmount(td, uap)
1131 struct thread *td;
1132 register struct unmount_args /* {
1133 char *path;
1134 int flags;
1135 } */ *uap;
1136{
1137 struct nameidata nd;
1138 struct mount *mp;
1139 char *pathbuf;
1140 int error, id0, id1;
1141
1142 AUDIT_ARG_VALUE(uap->flags);
1143 if (jailed(td->td_ucred) || usermount == 0) {
1144 error = priv_check(td, PRIV_VFS_UNMOUNT);
1145 if (error)
1146 return (error);
1147 }
1148
1149 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1150 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1151 if (error) {
1152 free(pathbuf, M_TEMP);
1153 return (error);
1154 }
1155 mtx_lock(&Giant);
1156 if (uap->flags & MNT_BYFSID) {
1157 AUDIT_ARG_TEXT(pathbuf);
1158 /* Decode the filesystem ID. */
1159 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1160 mtx_unlock(&Giant);
1161 free(pathbuf, M_TEMP);
1162 return (EINVAL);
1163 }
1164
1165 mtx_lock(&mountlist_mtx);
1166 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1167 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1168 mp->mnt_stat.f_fsid.val[1] == id1)
1169 break;
1170 }
1171 mtx_unlock(&mountlist_mtx);
1172 } else {
1173 /*
1174 * Try to find global path for path argument.
1175 */
1176 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1177 UIO_SYSSPACE, pathbuf, td);
1178 if (namei(&nd) == 0) {
1179 NDFREE(&nd, NDF_ONLY_PNBUF);
1180 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1181 MNAMELEN);
1182 if (error == 0 || error == ENODEV)
1183 vput(nd.ni_vp);
1184 }
1185 mtx_lock(&mountlist_mtx);
1186 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1187 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
1188 break;
1189 }
1190 mtx_unlock(&mountlist_mtx);
1191 }
1192 free(pathbuf, M_TEMP);
1193 if (mp == NULL) {
1194 /*
1195 * Previously we returned ENOENT for a nonexistent path and
1196 * EINVAL for a non-mountpoint. We cannot tell these apart
1197 * now, so in the !MNT_BYFSID case return the more likely
1198 * EINVAL for compatibility.
1199 */
1200 mtx_unlock(&Giant);
1201 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1202 }
1203
1204 /*
1205 * Don't allow unmounting the root filesystem.
1206 */
1207 if (mp->mnt_flag & MNT_ROOTFS) {
1208 mtx_unlock(&Giant);
1209 return (EINVAL);
1210 }
1211 error = dounmount(mp, uap->flags, td);
1212 mtx_unlock(&Giant);
1213 return (error);
1214}
1215
1216/*
1217 * Do the actual filesystem unmount.
1218 */
1219int
1220dounmount(mp, flags, td)
1221 struct mount *mp;
1222 int flags;
1223 struct thread *td;
1224{
1225 struct vnode *coveredvp, *fsrootvp;
1226 int error;
1227 uint64_t async_flag;
1228 int mnt_gen_r;
1229
1230 mtx_assert(&Giant, MA_OWNED);
1231
1232 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1233 mnt_gen_r = mp->mnt_gen;
1234 VI_LOCK(coveredvp);
1235 vholdl(coveredvp);
1236 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1237 vdrop(coveredvp);
1238 /*
1239 * Check for mp being unmounted while waiting for the
1240 * covered vnode lock.
1241 */
1242 if (coveredvp->v_mountedhere != mp ||
1243 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1244 VOP_UNLOCK(coveredvp, 0);
1245 return (EBUSY);
1246 }
1247 }
1248 /*
1249 * Only privileged root, or (if MNT_USER is set) the user that did the
1250 * original mount is permitted to unmount this filesystem.
1251 */
1252 error = vfs_suser(mp, td);
1253 if (error) {
1254 if (coveredvp)
1255 VOP_UNLOCK(coveredvp, 0);
1256 return (error);
1257 }
1258
1259 vn_start_write(NULL, &mp, V_WAIT);
1260 MNT_ILOCK(mp);
1261 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 ||
1262 !TAILQ_EMPTY(&mp->mnt_uppers)) {
1263 MNT_IUNLOCK(mp);
1264 if (coveredvp)
1265 VOP_UNLOCK(coveredvp, 0);
1266 vn_finished_write(mp);
1267 return (EBUSY);
1268 }
1269 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1270 /* Allow filesystems to detect that a forced unmount is in progress. */
1271 if (flags & MNT_FORCE)
1272 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1273 error = 0;
1274 if (mp->mnt_lockref) {
1275 mp->mnt_kern_flag |= MNTK_DRAINING;
1276 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1277 "mount drain", 0);
1278 }
1279 MNT_IUNLOCK(mp);
1280 KASSERT(mp->mnt_lockref == 0,
1281 ("%s: invalid lock refcount in the drain path @ %s:%d",
1282 __func__, __FILE__, __LINE__));
1283 KASSERT(error == 0,
1284 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1285 __func__, __FILE__, __LINE__));
1286
1287 if (mp->mnt_flag & MNT_EXPUBLIC)
1288 vfs_setpublicfs(NULL, NULL, NULL);
1289
1290 vfs_msync(mp, MNT_WAIT);
1291 MNT_ILOCK(mp);
1292 async_flag = mp->mnt_flag & MNT_ASYNC;
1293 mp->mnt_flag &= ~MNT_ASYNC;
1294 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1295 MNT_IUNLOCK(mp);
1296 cache_purgevfs(mp); /* remove cache entries for this file sys */
1297 vfs_deallocate_syncvnode(mp);
1298 /*
1299 * For forced unmounts, move process cdir/rdir refs on the fs root
1300 * vnode to the covered vnode. For non-forced unmounts we want
1301 * such references to cause an EBUSY error.
1302 */
1303 if ((flags & MNT_FORCE) &&
1304 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1305 if (mp->mnt_vnodecovered != NULL)
1306 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1307 if (fsrootvp == rootvnode) {
1308 vrele(rootvnode);
1309 rootvnode = NULL;
1310 }
1311 vput(fsrootvp);
1312 }
1313 if (((mp->mnt_flag & MNT_RDONLY) ||
1314 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0)
1315 error = VFS_UNMOUNT(mp, flags);
1316 vn_finished_write(mp);
1317 /*
1318 * If we failed to flush the dirty blocks for this mount point,
1319 * undo all the cdir/rdir and rootvnode changes we made above.
1320 * Unless we failed to do so because the device is reporting that
1321 * it doesn't exist anymore.
1322 */
1323 if (error && error != ENXIO) {
1324 if ((flags & MNT_FORCE) &&
1325 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1326 if (mp->mnt_vnodecovered != NULL)
1327 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1328 if (rootvnode == NULL) {
1329 rootvnode = fsrootvp;
1330 vref(rootvnode);
1331 }
1332 vput(fsrootvp);
1333 }
1334 MNT_ILOCK(mp);
1335 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1336 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1337 MNT_IUNLOCK(mp);
1338 vfs_allocate_syncvnode(mp);
1339 MNT_ILOCK(mp);
1340 }
1341 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1342 mp->mnt_flag |= async_flag;
1343 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1344 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1345 mp->mnt_kern_flag |= MNTK_ASYNC;
1346 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1347 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1348 wakeup(mp);
1349 }
1350 MNT_IUNLOCK(mp);
1351 if (coveredvp)
1352 VOP_UNLOCK(coveredvp, 0);
1353 return (error);
1354 }
1355 mtx_lock(&mountlist_mtx);
1356 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1357 mtx_unlock(&mountlist_mtx);
1358 if (coveredvp != NULL) {
1359 coveredvp->v_mountedhere = NULL;
1360 vput(coveredvp);
1361 }
1362 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1363 vfs_mount_destroy(mp);
1364 return (0);
1365}
1366
1367/*
1368 * Report errors during filesystem mounting.
1369 */
1370void
1371vfs_mount_error(struct mount *mp, const char *fmt, ...)
1372{
1373 struct vfsoptlist *moptlist = mp->mnt_optnew;
1374 va_list ap;
1375 int error, len;
1376 char *errmsg;
1377
1378 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1379 if (error || errmsg == NULL || len <= 0)
1380 return;
1381
1382 va_start(ap, fmt);
1383 vsnprintf(errmsg, (size_t)len, fmt, ap);
1384 va_end(ap);
1385}
1386
1387void
1388vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1389{
1390 va_list ap;
1391 int error, len;
1392 char *errmsg;
1393
1394 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1395 if (error || errmsg == NULL || len <= 0)
1396 return;
1397
1398 va_start(ap, fmt);
1399 vsnprintf(errmsg, (size_t)len, fmt, ap);
1400 va_end(ap);
1401}
1402
1403/*
1404 * ---------------------------------------------------------------------
1405 * Functions for querying mount options/arguments from filesystems.
1406 */
1407
1408/*
1409 * Check that no unknown options are given
1410 */
1411int
1412vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1413{
1414 struct vfsopt *opt;
1415 char errmsg[255];
1416 const char **t, *p, *q;
1417 int ret = 0;
1418
1419 TAILQ_FOREACH(opt, opts, link) {
1420 p = opt->name;
1421 q = NULL;
1422 if (p[0] == 'n' && p[1] == 'o')
1423 q = p + 2;
1424 for(t = global_opts; *t != NULL; t++) {
1425 if (strcmp(*t, p) == 0)
1426 break;
1427 if (q != NULL) {
1428 if (strcmp(*t, q) == 0)
1429 break;
1430 }
1431 }
1432 if (*t != NULL)
1433 continue;
1434 for(t = legal; *t != NULL; t++) {
1435 if (strcmp(*t, p) == 0)
1436 break;
1437 if (q != NULL) {
1438 if (strcmp(*t, q) == 0)
1439 break;
1440 }
1441 }
1442 if (*t != NULL)
1443 continue;
1444 snprintf(errmsg, sizeof(errmsg),
1445 "mount option <%s> is unknown", p);
1446 ret = EINVAL;
1447 }
1448 if (ret != 0) {
1449 TAILQ_FOREACH(opt, opts, link) {
1450 if (strcmp(opt->name, "errmsg") == 0) {
1451 strncpy((char *)opt->value, errmsg, opt->len);
1452 break;
1453 }
1454 }
1455 if (opt == NULL)
1456 printf("%s\n", errmsg);
1457 }
1458 return (ret);
1459}
1460
1461/*
1462 * Get a mount option by its name.
1463 *
1464 * Return 0 if the option was found, ENOENT otherwise.
1465 * If len is non-NULL it will be filled with the length
1466 * of the option. If buf is non-NULL, it will be filled
1467 * with the address of the option.
1468 */
1469int
1470vfs_getopt(opts, name, buf, len)
1471 struct vfsoptlist *opts;
1472 const char *name;
1473 void **buf;
1474 int *len;
1475{
1476 struct vfsopt *opt;
1477
1478 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1479
1480 TAILQ_FOREACH(opt, opts, link) {
1481 if (strcmp(name, opt->name) == 0) {
1482 opt->seen = 1;
1483 if (len != NULL)
1484 *len = opt->len;
1485 if (buf != NULL)
1486 *buf = opt->value;
1487 return (0);
1488 }
1489 }
1490 return (ENOENT);
1491}
1492
1493int
1494vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1495{
1496 struct vfsopt *opt;
1497
1498 if (opts == NULL)
1499 return (-1);
1500
1501 TAILQ_FOREACH(opt, opts, link) {
1502 if (strcmp(name, opt->name) == 0) {
1503 opt->seen = 1;
1504 return (opt->pos);
1505 }
1506 }
1507 return (-1);
1508}
1509
1510int
1511vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1512{
1513 char *opt_value, *vtp;
1514 quad_t iv;
1515 int error, opt_len;
1516
1517 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1518 if (error != 0)
1519 return (error);
1520 if (opt_len == 0 || opt_value == NULL)
1521 return (EINVAL);
1522 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1523 return (EINVAL);
1524 iv = strtoq(opt_value, &vtp, 0);
1525 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1526 return (EINVAL);
1527 if (iv < 0)
1528 return (EINVAL);
1529 switch (vtp[0]) {
1530 case 't':
1531 case 'T':
1532 iv *= 1024;
1533 case 'g':
1534 case 'G':
1535 iv *= 1024;
1536 case 'm':
1537 case 'M':
1538 iv *= 1024;
1539 case 'k':
1540 case 'K':
1541 iv *= 1024;
1542 case '\0':
1543 break;
1544 default:
1545 return (EINVAL);
1546 }
1547 *value = iv;
1548
1549 return (0);
1550}
1551
1552char *
1553vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1554{
1555 struct vfsopt *opt;
1556
1557 *error = 0;
1558 TAILQ_FOREACH(opt, opts, link) {
1559 if (strcmp(name, opt->name) != 0)
1560 continue;
1561 opt->seen = 1;
1562 if (opt->len == 0 ||
1563 ((char *)opt->value)[opt->len - 1] != '\0') {
1564 *error = EINVAL;
1565 return (NULL);
1566 }
1567 return (opt->value);
1568 }
1569 *error = ENOENT;
1570 return (NULL);
1571}
1572
1573int
1574vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1575 uint64_t val)
1576{
1577 struct vfsopt *opt;
1578
1579 TAILQ_FOREACH(opt, opts, link) {
1580 if (strcmp(name, opt->name) == 0) {
1581 opt->seen = 1;
1582 if (w != NULL)
1583 *w |= val;
1584 return (1);
1585 }
1586 }
1587 if (w != NULL)
1588 *w &= ~val;
1589 return (0);
1590}
1591
1592int
1593vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1594{
1595 va_list ap;
1596 struct vfsopt *opt;
1597 int ret;
1598
1599 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1600
1601 TAILQ_FOREACH(opt, opts, link) {
1602 if (strcmp(name, opt->name) != 0)
1603 continue;
1604 opt->seen = 1;
1605 if (opt->len == 0 || opt->value == NULL)
1606 return (0);
1607 if (((char *)opt->value)[opt->len - 1] != '\0')
1608 return (0);
1609 va_start(ap, fmt);
1610 ret = vsscanf(opt->value, fmt, ap);
1611 va_end(ap);
1612 return (ret);
1613 }
1614 return (0);
1615}
1616
1617int
1618vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1619{
1620 struct vfsopt *opt;
1621
1622 TAILQ_FOREACH(opt, opts, link) {
1623 if (strcmp(name, opt->name) != 0)
1624 continue;
1625 opt->seen = 1;
1626 if (opt->value == NULL)
1627 opt->len = len;
1628 else {
1629 if (opt->len != len)
1630 return (EINVAL);
1631 bcopy(value, opt->value, len);
1632 }
1633 return (0);
1634 }
1635 return (ENOENT);
1636}
1637
1638int
1639vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1640{
1641 struct vfsopt *opt;
1642
1643 TAILQ_FOREACH(opt, opts, link) {
1644 if (strcmp(name, opt->name) != 0)
1645 continue;
1646 opt->seen = 1;
1647 if (opt->value == NULL)
1648 opt->len = len;
1649 else {
1650 if (opt->len < len)
1651 return (EINVAL);
1652 opt->len = len;
1653 bcopy(value, opt->value, len);
1654 }
1655 return (0);
1656 }
1657 return (ENOENT);
1658}
1659
1660int
1661vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1662{
1663 struct vfsopt *opt;
1664
1665 TAILQ_FOREACH(opt, opts, link) {
1666 if (strcmp(name, opt->name) != 0)
1667 continue;
1668 opt->seen = 1;
1669 if (opt->value == NULL)
1670 opt->len = strlen(value) + 1;
1671 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1672 return (EINVAL);
1673 return (0);
1674 }
1675 return (ENOENT);
1676}
1677
1678/*
1679 * Find and copy a mount option.
1680 *
1681 * The size of the buffer has to be specified
1682 * in len, if it is not the same length as the
1683 * mount option, EINVAL is returned.
1684 * Returns ENOENT if the option is not found.
1685 */
1686int
1687vfs_copyopt(opts, name, dest, len)
1688 struct vfsoptlist *opts;
1689 const char *name;
1690 void *dest;
1691 int len;
1692{
1693 struct vfsopt *opt;
1694
1695 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1696
1697 TAILQ_FOREACH(opt, opts, link) {
1698 if (strcmp(name, opt->name) == 0) {
1699 opt->seen = 1;
1700 if (len != opt->len)
1701 return (EINVAL);
1702 bcopy(opt->value, dest, opt->len);
1703 return (0);
1704 }
1705 }
1706 return (ENOENT);
1707}
1708
1709int
1710__vfs_statfs(struct mount *mp, struct statfs *sbp)
1711{
1712 int error;
1713
1714 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1715 if (sbp != &mp->mnt_stat)
1716 *sbp = mp->mnt_stat;
1717 return (error);
1718}
1719
1720void
1721vfs_mountedfrom(struct mount *mp, const char *from)
1722{
1723
1724 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1725 strlcpy(mp->mnt_stat.f_mntfromname, from,
1726 sizeof mp->mnt_stat.f_mntfromname);
1727}
1728
1729/*
1730 * ---------------------------------------------------------------------
1731 * This is the api for building mount args and mounting filesystems from
1732 * inside the kernel.
1733 *
1734 * The API works by accumulation of individual args. First error is
1735 * latched.
1736 *
1737 * XXX: should be documented in new manpage kernel_mount(9)
1738 */
1739
1740/* A memory allocation which must be freed when we are done */
1741struct mntaarg {
1742 SLIST_ENTRY(mntaarg) next;
1743};
1744
1745/* The header for the mount arguments */
1746struct mntarg {
1747 struct iovec *v;
1748 int len;
1749 int error;
1750 SLIST_HEAD(, mntaarg) list;
1751};
1752
1753/*
1754 * Add a boolean argument.
1755 *
1756 * flag is the boolean value.
1757 * name must start with "no".
1758 */
1759struct mntarg *
1760mount_argb(struct mntarg *ma, int flag, const char *name)
1761{
1762
1763 KASSERT(name[0] == 'n' && name[1] == 'o',
1764 ("mount_argb(...,%s): name must start with 'no'", name));
1765
1766 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1767}
1768
1769/*
1770 * Add an argument printf style
1771 */
1772struct mntarg *
1773mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1774{
1775 va_list ap;
1776 struct mntaarg *maa;
1777 struct sbuf *sb;
1778 int len;
1779
1780 if (ma == NULL) {
1781 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1782 SLIST_INIT(&ma->list);
1783 }
1784 if (ma->error)
1785 return (ma);
1786
1787 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1788 M_MOUNT, M_WAITOK);
1789 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1790 ma->v[ma->len].iov_len = strlen(name) + 1;
1791 ma->len++;
1792
1793 sb = sbuf_new_auto();
1794 va_start(ap, fmt);
1795 sbuf_vprintf(sb, fmt, ap);
1796 va_end(ap);
1797 sbuf_finish(sb);
1798 len = sbuf_len(sb) + 1;
1799 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1800 SLIST_INSERT_HEAD(&ma->list, maa, next);
1801 bcopy(sbuf_data(sb), maa + 1, len);
1802 sbuf_delete(sb);
1803
1804 ma->v[ma->len].iov_base = maa + 1;
1805 ma->v[ma->len].iov_len = len;
1806 ma->len++;
1807
1808 return (ma);
1809}
1810
1811/*
1812 * Add an argument which is a userland string.
1813 */
1814struct mntarg *
1815mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1816{
1817 struct mntaarg *maa;
1818 char *tbuf;
1819
1820 if (val == NULL)
1821 return (ma);
1822 if (ma == NULL) {
1823 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1824 SLIST_INIT(&ma->list);
1825 }
1826 if (ma->error)
1827 return (ma);
1828 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1829 SLIST_INSERT_HEAD(&ma->list, maa, next);
1830 tbuf = (void *)(maa + 1);
1831 ma->error = copyinstr(val, tbuf, len, NULL);
1832 return (mount_arg(ma, name, tbuf, -1));
1833}
1834
1835/*
1836 * Plain argument.
1837 *
1838 * If length is -1, treat value as a C string.
1839 */
1840struct mntarg *
1841mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1842{
1843
1844 if (ma == NULL) {
1845 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1846 SLIST_INIT(&ma->list);
1847 }
1848 if (ma->error)
1849 return (ma);
1850
1851 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1852 M_MOUNT, M_WAITOK);
1853 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1854 ma->v[ma->len].iov_len = strlen(name) + 1;
1855 ma->len++;
1856
1857 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1858 if (len < 0)
1859 ma->v[ma->len].iov_len = strlen(val) + 1;
1860 else
1861 ma->v[ma->len].iov_len = len;
1862 ma->len++;
1863 return (ma);
1864}
1865
1866/*
1867 * Free a mntarg structure
1868 */
1869static void
1870free_mntarg(struct mntarg *ma)
1871{
1872 struct mntaarg *maa;
1873
1874 while (!SLIST_EMPTY(&ma->list)) {
1875 maa = SLIST_FIRST(&ma->list);
1876 SLIST_REMOVE_HEAD(&ma->list, next);
1877 free(maa, M_MOUNT);
1878 }
1879 free(ma->v, M_MOUNT);
1880 free(ma, M_MOUNT);
1881}
1882
1883/*
1884 * Mount a filesystem
1885 */
1886int
1887kernel_mount(struct mntarg *ma, uint64_t flags)
1888{
1889 struct uio auio;
1890 int error;
1891
1892 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
1893 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
1894 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
1895
1896 auio.uio_iov = ma->v;
1897 auio.uio_iovcnt = ma->len;
1898 auio.uio_segflg = UIO_SYSSPACE;
1899
1900 error = ma->error;
1901 if (!error)
1902 error = vfs_donmount(curthread, flags, &auio);
1903 free_mntarg(ma);
1904 return (error);
1905}
1906
1907/*
1908 * A printflike function to mount a filesystem.
1909 */
1910int
1911kernel_vmount(int flags, ...)
1912{
1913 struct mntarg *ma = NULL;
1914 va_list ap;
1915 const char *cp;
1916 const void *vp;
1917 int error;
1918
1919 va_start(ap, flags);
1920 for (;;) {
1921 cp = va_arg(ap, const char *);
1922 if (cp == NULL)
1923 break;
1924 vp = va_arg(ap, const void *);
1925 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
1926 }
1927 va_end(ap);
1928
1929 error = kernel_mount(ma, flags);
1930 return (error);
1931}
1932
1933void
1934vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
1935{
1936
1937 bcopy(oexp, exp, sizeof(*oexp));
1938 exp->ex_numsecflavors = 0;
1939}
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