1799 lines
42 KiB
C
1799 lines
42 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Copyright (c) 1999 Michael Smith
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* All rights reserved.
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* Copyright (c) 1999 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/filedesc.h>
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#include <sys/reboot.h>
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#include <sys/sysproto.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <geom/geom.h>
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#include <machine/stdarg.h>
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#include "opt_rootdevname.h"
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#include "opt_ddb.h"
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#include "opt_mac.h"
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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#define ROOTNAME "root_device"
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static void checkdirs(struct vnode *olddp, struct vnode *newdp);
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static int vfs_nmount(struct thread *td, int, struct uio *);
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static int vfs_mountroot_try(char *mountfrom);
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static int vfs_mountroot_ask(void);
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static void gets(char *cp);
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static int usermount = 0; /* if 1, non-root can mount fs. */
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SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, "");
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MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
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/* List of mounted filesystems. */
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struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
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/* For any iteration/modification of mountlist */
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struct mtx mountlist_mtx;
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/* For any iteration/modification of mnt_vnodelist */
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struct mtx mntvnode_mtx;
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/*
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* The vnode of the system's root (/ in the filesystem, without chroot
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* active.)
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*/
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struct vnode *rootvnode;
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/*
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* The root filesystem is detailed in the kernel environment variable
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* vfs.root.mountfrom, which is expected to be in the general format
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*
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* <vfsname>:[<path>]
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* vfsname := the name of a VFS known to the kernel and capable
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* of being mounted as root
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* path := disk device name or other data used by the filesystem
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* to locate its physical store
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*/
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/*
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* The root specifiers we will try if RB_CDROM is specified.
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*/
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static char *cdrom_rootdevnames[] = {
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"cd9660:cd0",
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"cd9660:acd0",
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NULL
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};
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/* legacy find-root code */
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char *rootdevnames[2] = {NULL, NULL};
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static int setrootbyname(char *name);
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dev_t rootdev = NODEV;
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/*
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* Has to be dynamic as the value of rootdev can change; however, it can't
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* change after the root is mounted, so a user process can't access this
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* sysctl until after the value is unchangeable.
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*/
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static int
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sysctl_rootdev(SYSCTL_HANDLER_ARGS)
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{
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int error;
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/* _RD prevents this from happening. */
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KASSERT(req->newptr == NULL, ("Attempt to change root device name"));
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if (rootdev != NODEV)
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error = sysctl_handle_string(oidp, rootdev->si_name, 0, req);
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else
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error = sysctl_handle_string(oidp, "", 0, req);
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return (error);
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}
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SYSCTL_PROC(_kern, OID_AUTO, rootdev, CTLTYPE_STRING | CTLFLAG_RD,
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0, 0, sysctl_rootdev, "A", "Root file system device");
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/* Remove one mount option. */
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static void
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vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
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{
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TAILQ_REMOVE(opts, opt, link);
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free(opt->name, M_MOUNT);
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if (opt->value != NULL)
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free(opt->value, M_MOUNT);
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#ifdef INVARIANTS
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else if (opt->len != 0)
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panic("%s: mount option with NULL value but length != 0",
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__func__);
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#endif
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free(opt, M_MOUNT);
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}
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/* Release all resources related to the mount options. */
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static void
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vfs_freeopts(struct vfsoptlist *opts)
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{
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struct vfsopt *opt;
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while (!TAILQ_EMPTY(opts)) {
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opt = TAILQ_FIRST(opts);
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vfs_freeopt(opts, opt);
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}
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free(opts, M_MOUNT);
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}
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/*
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* If a mount option is specified several times,
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* (with or without the "no" prefix) only keep
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* the last occurence of it.
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*/
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static void
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vfs_sanitizeopts(struct vfsoptlist *opts)
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{
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struct vfsopt *opt, *opt2, *tmp;
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int noopt;
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TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
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if (strncmp(opt->name, "no", 2) == 0)
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noopt = 1;
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else
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noopt = 0;
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opt2 = TAILQ_PREV(opt, vfsoptlist, link);
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while (opt2 != NULL) {
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if (strcmp(opt2->name, opt->name) == 0 ||
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(noopt && strcmp(opt->name + 2, opt2->name) == 0) ||
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(!noopt && strncmp(opt2->name, "no", 2) == 0 &&
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strcmp(opt2->name + 2, opt->name) == 0)) {
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tmp = TAILQ_PREV(opt2, vfsoptlist, link);
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vfs_freeopt(opts, opt2);
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opt2 = tmp;
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} else {
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opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
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}
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}
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}
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}
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/*
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* Build a linked list of mount options from a struct uio.
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*/
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static int
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vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
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{
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struct vfsoptlist *opts;
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struct vfsopt *opt;
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unsigned int i, iovcnt;
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int error, namelen, optlen;
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iovcnt = auio->uio_iovcnt;
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opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
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TAILQ_INIT(opts);
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for (i = 0; i < iovcnt; i += 2) {
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opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
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namelen = auio->uio_iov[i].iov_len;
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optlen = auio->uio_iov[i + 1].iov_len;
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opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
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opt->value = NULL;
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if (auio->uio_segflg == UIO_SYSSPACE) {
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bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
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} else {
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error = copyin(auio->uio_iov[i].iov_base, opt->name,
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namelen);
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if (error)
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goto bad;
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}
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opt->len = optlen;
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if (optlen != 0) {
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opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
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if (auio->uio_segflg == UIO_SYSSPACE) {
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bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
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optlen);
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} else {
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error = copyin(auio->uio_iov[i + 1].iov_base,
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opt->value, optlen);
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if (error)
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goto bad;
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}
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}
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TAILQ_INSERT_TAIL(opts, opt, link);
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}
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vfs_sanitizeopts(opts);
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*options = opts;
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return (0);
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bad:
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vfs_freeopts(opts);
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return (error);
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}
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/*
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* Merge the old mount options with the new ones passed
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* in the MNT_UPDATE case.
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*/
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static void
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vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts)
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{
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struct vfsopt *opt, *opt2, *new;
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TAILQ_FOREACH(opt, opts, link) {
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/*
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* Check that this option hasn't been redefined
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* nor cancelled with a "no" mount option.
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*/
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opt2 = TAILQ_FIRST(toopts);
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while (opt2 != NULL) {
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if (strcmp(opt2->name, opt->name) == 0)
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goto next;
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if (strncmp(opt2->name, "no", 2) == 0 &&
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strcmp(opt2->name + 2, opt->name) == 0) {
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vfs_freeopt(toopts, opt2);
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goto next;
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}
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opt2 = TAILQ_NEXT(opt2, link);
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}
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/* We want this option, duplicate it. */
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new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
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new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK);
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strcpy(new->name, opt->name);
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if (opt->len != 0) {
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new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
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bcopy(opt->value, new->value, opt->len);
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} else {
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new->value = NULL;
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}
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new->len = opt->len;
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TAILQ_INSERT_TAIL(toopts, new, link);
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next:
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continue;
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}
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}
|
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|
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/*
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* New mount API.
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*/
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int
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nmount(td, uap)
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struct thread *td;
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struct nmount_args /* {
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struct iovec *iovp;
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unsigned int iovcnt;
|
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int flags;
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} */ *uap;
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{
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struct uio auio;
|
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struct iovec *iov, *needfree;
|
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struct iovec aiov[UIO_SMALLIOV];
|
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unsigned int i;
|
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int error;
|
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u_int iovlen, iovcnt;
|
|
|
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iovcnt = uap->iovcnt;
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iovlen = iovcnt * sizeof (struct iovec);
|
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/*
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* Check that we have an even number of iovec's
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* and that we have at least two options.
|
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*/
|
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if ((iovcnt & 1) || (iovcnt < 4) || (iovcnt > UIO_MAXIOV))
|
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return (EINVAL);
|
|
|
|
if (iovcnt > UIO_SMALLIOV) {
|
|
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
|
|
needfree = iov;
|
|
} else {
|
|
iov = aiov;
|
|
needfree = NULL;
|
|
}
|
|
auio.uio_iov = iov;
|
|
auio.uio_iovcnt = iovcnt;
|
|
auio.uio_segflg = UIO_USERSPACE;
|
|
if ((error = copyin(uap->iovp, iov, iovlen)))
|
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goto finish;
|
|
|
|
for (i = 0; i < iovcnt; i++) {
|
|
if (iov->iov_len > MMAXOPTIONLEN) {
|
|
error = EINVAL;
|
|
goto finish;
|
|
}
|
|
iov++;
|
|
}
|
|
error = vfs_nmount(td, uap->flags, &auio);
|
|
finish:
|
|
if (needfree != NULL)
|
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free(needfree, M_TEMP);
|
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return (error);
|
|
}
|
|
|
|
int
|
|
kernel_mount(iovp, iovcnt, flags)
|
|
struct iovec *iovp;
|
|
unsigned int iovcnt;
|
|
int flags;
|
|
{
|
|
struct uio auio;
|
|
int error;
|
|
|
|
/*
|
|
* Check that we have an even number of iovec's
|
|
* and that we have at least two options.
|
|
*/
|
|
if ((iovcnt & 1) || (iovcnt < 4))
|
|
return (EINVAL);
|
|
|
|
auio.uio_iov = iovp;
|
|
auio.uio_iovcnt = iovcnt;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
|
|
error = vfs_nmount(curthread, flags, &auio);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kernel_vmount(int flags, ...)
|
|
{
|
|
struct iovec *iovp;
|
|
struct uio auio;
|
|
va_list ap;
|
|
unsigned int iovcnt, iovlen, len;
|
|
const char *cp;
|
|
char *buf, *pos;
|
|
size_t n;
|
|
int error, i;
|
|
|
|
len = 0;
|
|
va_start(ap, flags);
|
|
for (iovcnt = 0; (cp = va_arg(ap, const char *)) != NULL; iovcnt++)
|
|
len += strlen(cp) + 1;
|
|
va_end(ap);
|
|
|
|
if (iovcnt < 4 || iovcnt & 1)
|
|
return (EINVAL);
|
|
|
|
iovlen = iovcnt * sizeof (struct iovec);
|
|
MALLOC(iovp, struct iovec *, iovlen, M_MOUNT, M_WAITOK);
|
|
MALLOC(buf, char *, len, M_MOUNT, M_WAITOK);
|
|
pos = buf;
|
|
va_start(ap, flags);
|
|
for (i = 0; i < iovcnt; i++) {
|
|
cp = va_arg(ap, const char *);
|
|
copystr(cp, pos, len - (pos - buf), &n);
|
|
iovp[i].iov_base = pos;
|
|
iovp[i].iov_len = n;
|
|
pos += n;
|
|
}
|
|
va_end(ap);
|
|
|
|
auio.uio_iov = iovp;
|
|
auio.uio_iovcnt = iovcnt;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
|
|
error = vfs_nmount(curthread, flags, &auio);
|
|
FREE(iovp, M_MOUNT);
|
|
FREE(buf, M_MOUNT);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* vfs_nmount(): actually attempt a filesystem mount.
|
|
*/
|
|
static int
|
|
vfs_nmount(td, fsflags, fsoptions)
|
|
struct thread *td;
|
|
int fsflags; /* Flags common to all filesystems. */
|
|
struct uio *fsoptions; /* Options local to the filesystem. */
|
|
{
|
|
linker_file_t lf;
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
struct vfsconf *vfsp;
|
|
struct vfsoptlist *optlist;
|
|
char *fstype, *fspath;
|
|
int error, flag = 0, kern_flag = 0;
|
|
int fstypelen, fspathlen;
|
|
struct vattr va;
|
|
struct nameidata nd;
|
|
|
|
error = vfs_buildopts(fsoptions, &optlist);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* We need these two options before the others,
|
|
* and they are mandatory for any filesystem.
|
|
* Ensure they are NUL terminated as well.
|
|
*/
|
|
fstypelen = 0;
|
|
error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
|
|
if (error || fstype[fstypelen - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
fspathlen = 0;
|
|
error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
|
|
if (error || fspath[fspathlen - 1] != '\0') {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Be ultra-paranoid about making sure the type and fspath
|
|
* variables will fit in our mp buffers, including the
|
|
* terminating NUL.
|
|
*/
|
|
if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) {
|
|
error = ENAMETOOLONG;
|
|
goto bad;
|
|
}
|
|
|
|
if (usermount == 0) {
|
|
error = suser(td);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Do not allow NFS export by non-root users.
|
|
*/
|
|
if (fsflags & MNT_EXPORTED) {
|
|
error = suser(td);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Silently enforce MNT_NOSUID and MNT_NODEV for non-root users.
|
|
*/
|
|
if (suser(td))
|
|
fsflags |= MNT_NOSUID | MNT_NODEV;
|
|
/*
|
|
* Get vnode to be covered
|
|
*/
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, td);
|
|
if ((error = namei(&nd)) != 0)
|
|
goto bad;
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
vp = nd.ni_vp;
|
|
if (fsflags & MNT_UPDATE) {
|
|
if ((vp->v_vflag & VV_ROOT) == 0) {
|
|
vput(vp);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
mp = vp->v_mount;
|
|
flag = mp->mnt_flag;
|
|
kern_flag = mp->mnt_kern_flag;
|
|
/*
|
|
* We only allow the filesystem to be reloaded if it
|
|
* is currently mounted read-only.
|
|
*/
|
|
if ((fsflags & MNT_RELOAD) &&
|
|
((mp->mnt_flag & MNT_RDONLY) == 0)) {
|
|
vput(vp);
|
|
error = EOPNOTSUPP; /* Needs translation */
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Only root, or the user that did the original mount is
|
|
* permitted to update it.
|
|
*/
|
|
if (mp->mnt_cred->cr_uid != td->td_ucred->cr_uid) {
|
|
error = suser(td);
|
|
if (error) {
|
|
vput(vp);
|
|
goto bad;
|
|
}
|
|
}
|
|
if (vfs_busy(mp, LK_NOWAIT, 0, td)) {
|
|
vput(vp);
|
|
error = EBUSY;
|
|
goto bad;
|
|
}
|
|
VI_LOCK(vp);
|
|
if ((vp->v_iflag & VI_MOUNT) != 0 ||
|
|
vp->v_mountedhere != NULL) {
|
|
VI_UNLOCK(vp);
|
|
vfs_unbusy(mp, td);
|
|
vput(vp);
|
|
error = EBUSY;
|
|
goto bad;
|
|
}
|
|
vp->v_iflag |= VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
mp->mnt_flag |= fsflags &
|
|
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
mp->mnt_optnew = optlist;
|
|
vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
|
|
goto update;
|
|
}
|
|
/*
|
|
* If the user is not root, ensure that they own the directory
|
|
* onto which we are attempting to mount.
|
|
*/
|
|
error = VOP_GETATTR(vp, &va, td->td_ucred, td);
|
|
if (error) {
|
|
vput(vp);
|
|
goto bad;
|
|
}
|
|
if (va.va_uid != td->td_ucred->cr_uid) {
|
|
error = suser(td);
|
|
if (error) {
|
|
vput(vp);
|
|
goto bad;
|
|
}
|
|
}
|
|
if ((error = vinvalbuf(vp, V_SAVE, td->td_ucred, td, 0, 0)) != 0) {
|
|
vput(vp);
|
|
goto bad;
|
|
}
|
|
if (vp->v_type != VDIR) {
|
|
vput(vp);
|
|
error = ENOTDIR;
|
|
goto bad;
|
|
}
|
|
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
|
|
if (!strcmp(vfsp->vfc_name, fstype))
|
|
break;
|
|
if (vfsp == NULL) {
|
|
/* Only load modules for root (very important!). */
|
|
error = suser(td);
|
|
if (error) {
|
|
vput(vp);
|
|
goto bad;
|
|
}
|
|
error = securelevel_gt(td->td_ucred, 0);
|
|
if (error) {
|
|
vput(vp);
|
|
goto bad;
|
|
}
|
|
error = linker_load_module(NULL, fstype, NULL, NULL, &lf);
|
|
if (error || lf == NULL) {
|
|
vput(vp);
|
|
if (lf == NULL)
|
|
error = ENODEV;
|
|
goto bad;
|
|
}
|
|
lf->userrefs++;
|
|
/* Look up again to see if the VFS was loaded. */
|
|
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
|
|
if (!strcmp(vfsp->vfc_name, fstype))
|
|
break;
|
|
if (vfsp == NULL) {
|
|
lf->userrefs--;
|
|
linker_file_unload(lf);
|
|
vput(vp);
|
|
error = ENODEV;
|
|
goto bad;
|
|
}
|
|
}
|
|
VI_LOCK(vp);
|
|
if ((vp->v_iflag & VI_MOUNT) != 0 ||
|
|
vp->v_mountedhere != NULL) {
|
|
VI_UNLOCK(vp);
|
|
vput(vp);
|
|
error = EBUSY;
|
|
goto bad;
|
|
}
|
|
vp->v_iflag |= VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
|
|
/*
|
|
* Allocate and initialize the filesystem.
|
|
*/
|
|
mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO);
|
|
TAILQ_INIT(&mp->mnt_nvnodelist);
|
|
TAILQ_INIT(&mp->mnt_reservedvnlist);
|
|
mp->mnt_nvnodelistsize = 0;
|
|
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE);
|
|
(void)vfs_busy(mp, LK_NOWAIT, 0, td);
|
|
mp->mnt_op = vfsp->vfc_vfsops;
|
|
mp->mnt_vfc = vfsp;
|
|
vfsp->vfc_refcount++;
|
|
mp->mnt_stat.f_type = vfsp->vfc_typenum;
|
|
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
|
|
strlcpy(mp->mnt_stat.f_fstypename, fstype, MFSNAMELEN);
|
|
mp->mnt_vnodecovered = vp;
|
|
mp->mnt_cred = crdup(td->td_ucred);
|
|
mp->mnt_stat.f_owner = td->td_ucred->cr_uid;
|
|
strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
|
|
mp->mnt_iosize_max = DFLTPHYS;
|
|
#ifdef MAC
|
|
mac_init_mount(mp);
|
|
mac_create_mount(td->td_ucred, mp);
|
|
#endif
|
|
VOP_UNLOCK(vp, 0, td);
|
|
mp->mnt_optnew = optlist; /* XXXMAC: should this be above? */
|
|
|
|
update:
|
|
/*
|
|
* Check if the fs implements the new VFS_NMOUNT()
|
|
* function, since the new system call was used.
|
|
*/
|
|
if (mp->mnt_op->vfs_mount != NULL) {
|
|
printf("%s doesn't support the new mount syscall\n",
|
|
mp->mnt_vfc->vfc_name);
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
if (mp->mnt_flag & MNT_UPDATE)
|
|
vfs_unbusy(mp, td);
|
|
else {
|
|
mp->mnt_vfc->vfc_refcount--;
|
|
vfs_unbusy(mp, td);
|
|
#ifdef MAC
|
|
mac_destroy_mount(mp);
|
|
#endif
|
|
crfree(mp->mnt_cred);
|
|
free(mp, M_MOUNT);
|
|
}
|
|
vrele(vp);
|
|
error = EOPNOTSUPP;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Set the mount level flags.
|
|
*/
|
|
if (fsflags & MNT_RDONLY)
|
|
mp->mnt_flag |= MNT_RDONLY;
|
|
else if (mp->mnt_flag & MNT_RDONLY)
|
|
mp->mnt_kern_flag |= MNTK_WANTRDWR;
|
|
mp->mnt_flag &=~ MNT_UPDATEMASK;
|
|
mp->mnt_flag |= fsflags & (MNT_UPDATEMASK | MNT_FORCE);
|
|
/*
|
|
* Mount the filesystem.
|
|
* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
|
|
* get. No freeing of cn_pnbuf.
|
|
*/
|
|
error = VFS_NMOUNT(mp, &nd, td);
|
|
if (!error) {
|
|
if (mp->mnt_opt != NULL)
|
|
vfs_freeopts(mp->mnt_opt);
|
|
mp->mnt_opt = mp->mnt_optnew;
|
|
}
|
|
/*
|
|
* Prevent external consumers of mount
|
|
* options to read mnt_optnew.
|
|
*/
|
|
mp->mnt_optnew = NULL;
|
|
if (mp->mnt_flag & MNT_UPDATE) {
|
|
if (mp->mnt_kern_flag & MNTK_WANTRDWR)
|
|
mp->mnt_flag &= ~MNT_RDONLY;
|
|
mp->mnt_flag &=~
|
|
(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_SNAPSHOT);
|
|
mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
|
|
if (error) {
|
|
mp->mnt_flag = flag;
|
|
mp->mnt_kern_flag = kern_flag;
|
|
}
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
|
|
if (mp->mnt_syncer == NULL)
|
|
error = vfs_allocate_syncvnode(mp);
|
|
} else {
|
|
if (mp->mnt_syncer != NULL)
|
|
vrele(mp->mnt_syncer);
|
|
mp->mnt_syncer = NULL;
|
|
}
|
|
vfs_unbusy(mp, td);
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
vrele(vp);
|
|
return (error);
|
|
}
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
/*
|
|
* Put the new filesystem on the mount list after root.
|
|
*/
|
|
cache_purge(vp);
|
|
if (!error) {
|
|
struct vnode *newdp;
|
|
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
vp->v_mountedhere = mp;
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
if (VFS_ROOT(mp, &newdp))
|
|
panic("mount: lost mount");
|
|
checkdirs(vp, newdp);
|
|
vput(newdp);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0)
|
|
error = vfs_allocate_syncvnode(mp);
|
|
vfs_unbusy(mp, td);
|
|
if ((error = VFS_START(mp, 0, td)) != 0) {
|
|
vrele(vp);
|
|
goto bad;
|
|
}
|
|
} else {
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
mp->mnt_vfc->vfc_refcount--;
|
|
vfs_unbusy(mp, td);
|
|
#ifdef MAC
|
|
mac_destroy_mount(mp);
|
|
#endif
|
|
crfree(mp->mnt_cred);
|
|
free(mp, M_MOUNT);
|
|
vput(vp);
|
|
goto bad;
|
|
}
|
|
return (0);
|
|
bad:
|
|
vfs_freeopts(optlist);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Old mount API.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mount_args {
|
|
char *type;
|
|
char *path;
|
|
int flags;
|
|
caddr_t data;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
mount(td, uap)
|
|
struct thread *td;
|
|
struct mount_args /* {
|
|
char *type;
|
|
char *path;
|
|
int flags;
|
|
caddr_t data;
|
|
} */ *uap;
|
|
{
|
|
char *fstype;
|
|
char *fspath;
|
|
int error;
|
|
|
|
fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
|
|
fspath = malloc(MNAMELEN, M_TEMP, M_WAITOK);
|
|
|
|
/*
|
|
* vfs_mount() actually takes a kernel string for `type' and
|
|
* `path' now, so extract them.
|
|
*/
|
|
error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
|
|
if (error == 0)
|
|
error = copyinstr(uap->path, fspath, MNAMELEN, NULL);
|
|
if (error == 0)
|
|
error = vfs_mount(td, fstype, fspath, uap->flags, uap->data);
|
|
free(fstype, M_TEMP);
|
|
free(fspath, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* vfs_mount(): actually attempt a filesystem mount.
|
|
*
|
|
* This routine is designed to be a "generic" entry point for routines
|
|
* that wish to mount a filesystem. All parameters except `fsdata' are
|
|
* pointers into kernel space. `fsdata' is currently still a pointer
|
|
* into userspace.
|
|
*/
|
|
int
|
|
vfs_mount(td, fstype, fspath, fsflags, fsdata)
|
|
struct thread *td;
|
|
const char *fstype;
|
|
char *fspath;
|
|
int fsflags;
|
|
void *fsdata;
|
|
{
|
|
linker_file_t lf;
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
struct vfsconf *vfsp;
|
|
int error, flag = 0, kern_flag = 0;
|
|
struct vattr va;
|
|
struct nameidata nd;
|
|
|
|
/*
|
|
* Be ultra-paranoid about making sure the type and fspath
|
|
* variables will fit in our mp buffers, including the
|
|
* terminating NUL.
|
|
*/
|
|
if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
|
|
return (ENAMETOOLONG);
|
|
|
|
if (usermount == 0) {
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
/*
|
|
* Do not allow NFS export by non-root users.
|
|
*/
|
|
if (fsflags & MNT_EXPORTED) {
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
/*
|
|
* Silently enforce MNT_NOSUID and MNT_NODEV for non-root users.
|
|
*/
|
|
if (suser(td))
|
|
fsflags |= MNT_NOSUID | MNT_NODEV;
|
|
/*
|
|
* Get vnode to be covered
|
|
*/
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, td);
|
|
if ((error = namei(&nd)) != 0)
|
|
return (error);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
vp = nd.ni_vp;
|
|
if (fsflags & MNT_UPDATE) {
|
|
if ((vp->v_vflag & VV_ROOT) == 0) {
|
|
vput(vp);
|
|
return (EINVAL);
|
|
}
|
|
mp = vp->v_mount;
|
|
flag = mp->mnt_flag;
|
|
kern_flag = mp->mnt_kern_flag;
|
|
/*
|
|
* We only allow the filesystem to be reloaded if it
|
|
* is currently mounted read-only.
|
|
*/
|
|
if ((fsflags & MNT_RELOAD) &&
|
|
((mp->mnt_flag & MNT_RDONLY) == 0)) {
|
|
vput(vp);
|
|
return (EOPNOTSUPP); /* Needs translation */
|
|
}
|
|
/*
|
|
* Only root, or the user that did the original mount is
|
|
* permitted to update it.
|
|
*/
|
|
if (mp->mnt_cred->cr_uid != td->td_ucred->cr_uid) {
|
|
error = suser(td);
|
|
if (error) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
}
|
|
if (vfs_busy(mp, LK_NOWAIT, 0, td)) {
|
|
vput(vp);
|
|
return (EBUSY);
|
|
}
|
|
VI_LOCK(vp);
|
|
if ((vp->v_iflag & VI_MOUNT) != 0 ||
|
|
vp->v_mountedhere != NULL) {
|
|
VI_UNLOCK(vp);
|
|
vfs_unbusy(mp, td);
|
|
vput(vp);
|
|
return (EBUSY);
|
|
}
|
|
vp->v_iflag |= VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
mp->mnt_flag |= fsflags &
|
|
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
goto update;
|
|
}
|
|
/*
|
|
* If the user is not root, ensure that they own the directory
|
|
* onto which we are attempting to mount.
|
|
*/
|
|
error = VOP_GETATTR(vp, &va, td->td_ucred, td);
|
|
if (error) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
if (va.va_uid != td->td_ucred->cr_uid) {
|
|
error = suser(td);
|
|
if (error) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
}
|
|
if ((error = vinvalbuf(vp, V_SAVE, td->td_ucred, td, 0, 0)) != 0) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
if (vp->v_type != VDIR) {
|
|
vput(vp);
|
|
return (ENOTDIR);
|
|
}
|
|
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
|
|
if (!strcmp(vfsp->vfc_name, fstype))
|
|
break;
|
|
if (vfsp == NULL) {
|
|
/* Only load modules for root (very important!). */
|
|
error = suser(td);
|
|
if (error) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
error = securelevel_gt(td->td_ucred, 0);
|
|
if (error) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
error = linker_load_module(NULL, fstype, NULL, NULL, &lf);
|
|
if (error || lf == NULL) {
|
|
vput(vp);
|
|
if (lf == NULL)
|
|
error = ENODEV;
|
|
return (error);
|
|
}
|
|
lf->userrefs++;
|
|
/* Look up again to see if the VFS was loaded. */
|
|
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
|
|
if (!strcmp(vfsp->vfc_name, fstype))
|
|
break;
|
|
if (vfsp == NULL) {
|
|
lf->userrefs--;
|
|
linker_file_unload(lf);
|
|
vput(vp);
|
|
return (ENODEV);
|
|
}
|
|
}
|
|
VI_LOCK(vp);
|
|
if ((vp->v_iflag & VI_MOUNT) != 0 ||
|
|
vp->v_mountedhere != NULL) {
|
|
VI_UNLOCK(vp);
|
|
vput(vp);
|
|
return (EBUSY);
|
|
}
|
|
vp->v_iflag |= VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
|
|
/*
|
|
* Allocate and initialize the filesystem.
|
|
*/
|
|
mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO);
|
|
TAILQ_INIT(&mp->mnt_nvnodelist);
|
|
TAILQ_INIT(&mp->mnt_reservedvnlist);
|
|
mp->mnt_nvnodelistsize = 0;
|
|
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE);
|
|
(void)vfs_busy(mp, LK_NOWAIT, 0, td);
|
|
mp->mnt_op = vfsp->vfc_vfsops;
|
|
mp->mnt_vfc = vfsp;
|
|
vfsp->vfc_refcount++;
|
|
mp->mnt_stat.f_type = vfsp->vfc_typenum;
|
|
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
|
|
strlcpy(mp->mnt_stat.f_fstypename, fstype, MFSNAMELEN);
|
|
mp->mnt_vnodecovered = vp;
|
|
mp->mnt_cred = crdup(td->td_ucred);
|
|
mp->mnt_stat.f_owner = td->td_ucred->cr_uid;
|
|
strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
|
|
mp->mnt_iosize_max = DFLTPHYS;
|
|
#ifdef MAC
|
|
mac_init_mount(mp);
|
|
mac_create_mount(td->td_ucred, mp);
|
|
#endif
|
|
VOP_UNLOCK(vp, 0, td);
|
|
update:
|
|
/*
|
|
* Check if the fs implements the old VFS_MOUNT()
|
|
* function, since the old system call was used.
|
|
*/
|
|
if (mp->mnt_op->vfs_mount == NULL) {
|
|
printf("%s doesn't support the old mount syscall\n",
|
|
mp->mnt_vfc->vfc_name);
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
if (mp->mnt_flag & MNT_UPDATE)
|
|
vfs_unbusy(mp, td);
|
|
else {
|
|
mp->mnt_vfc->vfc_refcount--;
|
|
vfs_unbusy(mp, td);
|
|
#ifdef MAC
|
|
mac_destroy_mount(mp);
|
|
#endif
|
|
crfree(mp->mnt_cred);
|
|
free(mp, M_MOUNT);
|
|
}
|
|
vrele(vp);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* Set the mount level flags.
|
|
*/
|
|
if (fsflags & MNT_RDONLY)
|
|
mp->mnt_flag |= MNT_RDONLY;
|
|
else if (mp->mnt_flag & MNT_RDONLY)
|
|
mp->mnt_kern_flag |= MNTK_WANTRDWR;
|
|
mp->mnt_flag &=~ MNT_UPDATEMASK;
|
|
mp->mnt_flag |= fsflags & (MNT_UPDATEMASK | MNT_FORCE);
|
|
/*
|
|
* Mount the filesystem.
|
|
* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
|
|
* get. No freeing of cn_pnbuf.
|
|
*/
|
|
error = VFS_MOUNT(mp, fspath, fsdata, &nd, td);
|
|
if (mp->mnt_flag & MNT_UPDATE) {
|
|
if (mp->mnt_kern_flag & MNTK_WANTRDWR)
|
|
mp->mnt_flag &= ~MNT_RDONLY;
|
|
mp->mnt_flag &=~
|
|
(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_SNAPSHOT);
|
|
mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
|
|
if (error) {
|
|
mp->mnt_flag = flag;
|
|
mp->mnt_kern_flag = kern_flag;
|
|
}
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
|
|
if (mp->mnt_syncer == NULL)
|
|
error = vfs_allocate_syncvnode(mp);
|
|
} else {
|
|
if (mp->mnt_syncer != NULL)
|
|
vrele(mp->mnt_syncer);
|
|
mp->mnt_syncer = NULL;
|
|
}
|
|
vfs_unbusy(mp, td);
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
vrele(vp);
|
|
return (error);
|
|
}
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
/*
|
|
* Put the new filesystem on the mount list after root.
|
|
*/
|
|
cache_purge(vp);
|
|
if (!error) {
|
|
struct vnode *newdp;
|
|
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
vp->v_mountedhere = mp;
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
if (VFS_ROOT(mp, &newdp))
|
|
panic("mount: lost mount");
|
|
checkdirs(vp, newdp);
|
|
vput(newdp);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0)
|
|
error = vfs_allocate_syncvnode(mp);
|
|
vfs_unbusy(mp, td);
|
|
if ((error = VFS_START(mp, 0, td)) != 0)
|
|
vrele(vp);
|
|
} else {
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
mp->mnt_vfc->vfc_refcount--;
|
|
vfs_unbusy(mp, td);
|
|
#ifdef MAC
|
|
mac_destroy_mount(mp);
|
|
#endif
|
|
crfree(mp->mnt_cred);
|
|
free(mp, M_MOUNT);
|
|
vput(vp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Scan all active processes to see if any of them have a current
|
|
* or root directory of `olddp'. If so, replace them with the new
|
|
* mount point.
|
|
*/
|
|
static void
|
|
checkdirs(olddp, newdp)
|
|
struct vnode *olddp, *newdp;
|
|
{
|
|
struct filedesc *fdp;
|
|
struct proc *p;
|
|
int nrele;
|
|
|
|
if (vrefcnt(olddp) == 1)
|
|
return;
|
|
sx_slock(&allproc_lock);
|
|
LIST_FOREACH(p, &allproc, p_list) {
|
|
mtx_lock(&fdesc_mtx);
|
|
fdp = p->p_fd;
|
|
if (fdp == NULL) {
|
|
mtx_unlock(&fdesc_mtx);
|
|
continue;
|
|
}
|
|
nrele = 0;
|
|
FILEDESC_LOCK(fdp);
|
|
if (fdp->fd_cdir == olddp) {
|
|
VREF(newdp);
|
|
fdp->fd_cdir = newdp;
|
|
nrele++;
|
|
}
|
|
if (fdp->fd_rdir == olddp) {
|
|
VREF(newdp);
|
|
fdp->fd_rdir = newdp;
|
|
nrele++;
|
|
}
|
|
FILEDESC_UNLOCK(fdp);
|
|
mtx_unlock(&fdesc_mtx);
|
|
while (nrele--)
|
|
vrele(olddp);
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
if (rootvnode == olddp) {
|
|
vrele(rootvnode);
|
|
VREF(newdp);
|
|
rootvnode = newdp;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unmount a filesystem.
|
|
*
|
|
* Note: unmount takes a path to the vnode mounted on as argument,
|
|
* not special file (as before).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct unmount_args {
|
|
char *path;
|
|
int flags;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
unmount(td, uap)
|
|
struct thread *td;
|
|
register struct unmount_args /* {
|
|
char *path;
|
|
int flags;
|
|
} */ *uap;
|
|
{
|
|
struct mount *mp;
|
|
char *pathbuf;
|
|
int error, id0, id1;
|
|
|
|
pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
|
|
error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
|
|
if (error) {
|
|
free(pathbuf, M_TEMP);
|
|
return (error);
|
|
}
|
|
if (uap->flags & MNT_BYFSID) {
|
|
/* Decode the filesystem ID. */
|
|
if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
|
|
free(pathbuf, M_TEMP);
|
|
return (EINVAL);
|
|
}
|
|
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list)
|
|
if (mp->mnt_stat.f_fsid.val[0] == id0 &&
|
|
mp->mnt_stat.f_fsid.val[1] == id1)
|
|
break;
|
|
mtx_unlock(&mountlist_mtx);
|
|
} else {
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list)
|
|
if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0)
|
|
break;
|
|
mtx_unlock(&mountlist_mtx);
|
|
}
|
|
free(pathbuf, M_TEMP);
|
|
if (mp == NULL) {
|
|
/*
|
|
* Previously we returned ENOENT for a nonexistent path and
|
|
* EINVAL for a non-mountpoint. We cannot tell these apart
|
|
* now, so in the !MNT_BYFSID case return the more likely
|
|
* EINVAL for compatibility.
|
|
*/
|
|
return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Only root, or the user that did the original mount is
|
|
* permitted to unmount this filesystem.
|
|
*/
|
|
if (mp->mnt_cred->cr_uid != td->td_ucred->cr_uid) {
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Don't allow unmounting the root filesystem.
|
|
*/
|
|
if (mp->mnt_flag & MNT_ROOTFS)
|
|
return (EINVAL);
|
|
return (dounmount(mp, uap->flags, td));
|
|
}
|
|
|
|
/*
|
|
* Do the actual filesystem unmount.
|
|
*/
|
|
int
|
|
dounmount(mp, flags, td)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *coveredvp, *fsrootvp;
|
|
int error;
|
|
int async_flag;
|
|
|
|
mtx_lock(&mountlist_mtx);
|
|
if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
|
|
mtx_unlock(&mountlist_mtx);
|
|
return (EBUSY);
|
|
}
|
|
mp->mnt_kern_flag |= MNTK_UNMOUNT;
|
|
/* Allow filesystems to detect that a forced unmount is in progress. */
|
|
if (flags & MNT_FORCE)
|
|
mp->mnt_kern_flag |= MNTK_UNMOUNTF;
|
|
error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK |
|
|
((flags & MNT_FORCE) ? 0 : LK_NOWAIT), &mountlist_mtx, td);
|
|
if (error) {
|
|
mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
|
|
if (mp->mnt_kern_flag & MNTK_MWAIT)
|
|
wakeup(mp);
|
|
return (error);
|
|
}
|
|
vn_start_write(NULL, &mp, V_WAIT);
|
|
|
|
if (mp->mnt_flag & MNT_EXPUBLIC)
|
|
vfs_setpublicfs(NULL, NULL, NULL);
|
|
|
|
vfs_msync(mp, MNT_WAIT);
|
|
async_flag = mp->mnt_flag & MNT_ASYNC;
|
|
mp->mnt_flag &=~ MNT_ASYNC;
|
|
cache_purgevfs(mp); /* remove cache entries for this file sys */
|
|
if (mp->mnt_syncer != NULL)
|
|
vrele(mp->mnt_syncer);
|
|
/* Move process cdir/rdir refs on fs root to underlying vnode. */
|
|
if (VFS_ROOT(mp, &fsrootvp) == 0) {
|
|
if (mp->mnt_vnodecovered != NULL)
|
|
checkdirs(fsrootvp, mp->mnt_vnodecovered);
|
|
if (fsrootvp == rootvnode) {
|
|
vrele(rootvnode);
|
|
rootvnode = NULL;
|
|
}
|
|
vput(fsrootvp);
|
|
}
|
|
if (((mp->mnt_flag & MNT_RDONLY) ||
|
|
(error = VFS_SYNC(mp, MNT_WAIT, td->td_ucred, td)) == 0) ||
|
|
(flags & MNT_FORCE)) {
|
|
error = VFS_UNMOUNT(mp, flags, td);
|
|
}
|
|
vn_finished_write(mp);
|
|
if (error) {
|
|
/* Undo cdir/rdir and rootvnode changes made above. */
|
|
if (VFS_ROOT(mp, &fsrootvp) == 0) {
|
|
if (mp->mnt_vnodecovered != NULL)
|
|
checkdirs(mp->mnt_vnodecovered, fsrootvp);
|
|
if (rootvnode == NULL) {
|
|
rootvnode = fsrootvp;
|
|
vref(rootvnode);
|
|
}
|
|
vput(fsrootvp);
|
|
}
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL)
|
|
(void) vfs_allocate_syncvnode(mp);
|
|
mtx_lock(&mountlist_mtx);
|
|
mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
|
|
mp->mnt_flag |= async_flag;
|
|
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK,
|
|
&mountlist_mtx, td);
|
|
if (mp->mnt_kern_flag & MNTK_MWAIT)
|
|
wakeup(mp);
|
|
return (error);
|
|
}
|
|
crfree(mp->mnt_cred);
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_REMOVE(&mountlist, mp, mnt_list);
|
|
if ((coveredvp = mp->mnt_vnodecovered) != NULL)
|
|
coveredvp->v_mountedhere = NULL;
|
|
mp->mnt_vfc->vfc_refcount--;
|
|
if (!TAILQ_EMPTY(&mp->mnt_nvnodelist))
|
|
panic("unmount: dangling vnode");
|
|
lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_mtx, td);
|
|
lockdestroy(&mp->mnt_lock);
|
|
if (coveredvp != NULL)
|
|
vrele(coveredvp);
|
|
if (mp->mnt_kern_flag & MNTK_MWAIT)
|
|
wakeup(mp);
|
|
#ifdef MAC
|
|
mac_destroy_mount(mp);
|
|
#endif
|
|
if (mp->mnt_op->vfs_mount == NULL)
|
|
vfs_freeopts(mp->mnt_opt);
|
|
free(mp, M_MOUNT);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Lookup a filesystem type, and if found allocate and initialize
|
|
* a mount structure for it.
|
|
*
|
|
* Devname is usually updated by mount(8) after booting.
|
|
*/
|
|
int
|
|
vfs_rootmountalloc(fstypename, devname, mpp)
|
|
char *fstypename;
|
|
char *devname;
|
|
struct mount **mpp;
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
struct vfsconf *vfsp;
|
|
struct mount *mp;
|
|
|
|
if (fstypename == NULL)
|
|
return (ENODEV);
|
|
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
|
|
if (!strcmp(vfsp->vfc_name, fstypename))
|
|
break;
|
|
if (vfsp == NULL)
|
|
return (ENODEV);
|
|
mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO);
|
|
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE);
|
|
(void)vfs_busy(mp, LK_NOWAIT, 0, td);
|
|
TAILQ_INIT(&mp->mnt_nvnodelist);
|
|
TAILQ_INIT(&mp->mnt_reservedvnlist);
|
|
mp->mnt_nvnodelistsize = 0;
|
|
mp->mnt_vfc = vfsp;
|
|
mp->mnt_op = vfsp->vfc_vfsops;
|
|
mp->mnt_flag = MNT_RDONLY;
|
|
mp->mnt_vnodecovered = NULLVP;
|
|
mp->mnt_cred = crdup(td->td_ucred);
|
|
vfsp->vfc_refcount++;
|
|
mp->mnt_iosize_max = DFLTPHYS;
|
|
mp->mnt_stat.f_type = vfsp->vfc_typenum;
|
|
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
|
|
strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
|
|
mp->mnt_stat.f_mntonname[0] = '/';
|
|
mp->mnt_stat.f_mntonname[1] = 0;
|
|
strlcpy(mp->mnt_stat.f_mntfromname, devname, MNAMELEN);
|
|
#ifdef MAC
|
|
mac_init_mount(mp);
|
|
mac_create_mount(td->td_ucred, mp);
|
|
#endif
|
|
*mpp = mp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Find and mount the root filesystem
|
|
*/
|
|
void
|
|
vfs_mountroot(void)
|
|
{
|
|
char *cp;
|
|
int i, error;
|
|
|
|
g_waitidle();
|
|
|
|
/*
|
|
* The root filesystem information is compiled in, and we are
|
|
* booted with instructions to use it.
|
|
*/
|
|
#ifdef ROOTDEVNAME
|
|
if ((boothowto & RB_DFLTROOT) &&
|
|
!vfs_mountroot_try(ROOTDEVNAME))
|
|
return;
|
|
#endif
|
|
/*
|
|
* We are booted with instructions to prompt for the root filesystem,
|
|
* or to use the compiled-in default when it doesn't exist.
|
|
*/
|
|
if (boothowto & (RB_DFLTROOT | RB_ASKNAME)) {
|
|
if (!vfs_mountroot_ask())
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We've been given the generic "use CDROM as root" flag. This is
|
|
* necessary because one media may be used in many different
|
|
* devices, so we need to search for them.
|
|
*/
|
|
if (boothowto & RB_CDROM) {
|
|
for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
|
|
if (!vfs_mountroot_try(cdrom_rootdevnames[i]))
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Try to use the value read by the loader from /etc/fstab, or
|
|
* supplied via some other means. This is the preferred
|
|
* mechanism.
|
|
*/
|
|
if ((cp = getenv("vfs.root.mountfrom")) != NULL) {
|
|
error = vfs_mountroot_try(cp);
|
|
freeenv(cp);
|
|
if (!error)
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Try values that may have been computed by the machine-dependant
|
|
* legacy code.
|
|
*/
|
|
if (!vfs_mountroot_try(rootdevnames[0]))
|
|
return;
|
|
if (!vfs_mountroot_try(rootdevnames[1]))
|
|
return;
|
|
|
|
/*
|
|
* If we have a compiled-in default, and haven't already tried it, try
|
|
* it now.
|
|
*/
|
|
#ifdef ROOTDEVNAME
|
|
if (!(boothowto & RB_DFLTROOT))
|
|
if (!vfs_mountroot_try(ROOTDEVNAME))
|
|
return;
|
|
#endif
|
|
|
|
/*
|
|
* Everything so far has failed, prompt on the console if we haven't
|
|
* already tried that.
|
|
*/
|
|
if (!(boothowto & (RB_DFLTROOT | RB_ASKNAME)) && !vfs_mountroot_ask())
|
|
return;
|
|
panic("Root mount failed, startup aborted.");
|
|
}
|
|
|
|
/*
|
|
* Mount (mountfrom) as the root filesystem.
|
|
*/
|
|
static int
|
|
vfs_mountroot_try(char *mountfrom)
|
|
{
|
|
struct mount *mp;
|
|
char *vfsname, *path;
|
|
const char *devname;
|
|
int error;
|
|
char patt[32];
|
|
int s;
|
|
|
|
vfsname = NULL;
|
|
path = NULL;
|
|
mp = NULL;
|
|
error = EINVAL;
|
|
|
|
if (mountfrom == NULL)
|
|
return(error); /* don't complain */
|
|
|
|
s = splcam(); /* Overkill, but annoying without it */
|
|
printf("Mounting root from %s\n", mountfrom);
|
|
splx(s);
|
|
|
|
/* parse vfs name and path */
|
|
vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK);
|
|
path = malloc(MNAMELEN, M_MOUNT, M_WAITOK);
|
|
vfsname[0] = path[0] = 0;
|
|
sprintf(patt, "%%%d[a-z0-9]:%%%zds", MFSNAMELEN, MNAMELEN);
|
|
if (sscanf(mountfrom, patt, vfsname, path) < 1)
|
|
goto done;
|
|
|
|
/* allocate a root mount */
|
|
error = vfs_rootmountalloc(vfsname, path[0] != 0 ? path : ROOTNAME,
|
|
&mp);
|
|
if (error != 0) {
|
|
printf("Can't allocate root mount for filesystem '%s': %d\n",
|
|
vfsname, error);
|
|
goto done;
|
|
}
|
|
mp->mnt_flag |= MNT_ROOTFS;
|
|
|
|
/* do our best to set rootdev */
|
|
if ((path[0] != 0) && setrootbyname(path))
|
|
printf("setrootbyname failed\n");
|
|
|
|
/* If the root device is a type "memory disk", mount RW */
|
|
if (rootdev != NODEV && devsw(rootdev) != NULL) {
|
|
devname = devtoname(rootdev);
|
|
if (devname[0] == 'm' && devname[1] == 'd')
|
|
mp->mnt_flag &= ~MNT_RDONLY;
|
|
}
|
|
|
|
/*
|
|
* Set the mount path to be something useful, because the
|
|
* filesystem code isn't responsible now for initialising
|
|
* f_mntonname unless they want to override the default
|
|
* (which is `path'.)
|
|
*/
|
|
strlcpy(mp->mnt_stat.f_mntonname, "/", MNAMELEN);
|
|
|
|
error = VFS_MOUNT(mp, NULL, NULL, NULL, curthread);
|
|
|
|
done:
|
|
if (vfsname != NULL)
|
|
free(vfsname, M_MOUNT);
|
|
if (path != NULL)
|
|
free(path, M_MOUNT);
|
|
if (error != 0) {
|
|
if (mp != NULL) {
|
|
vfs_unbusy(mp, curthread);
|
|
#ifdef MAC
|
|
mac_destroy_mount(mp);
|
|
#endif
|
|
crfree(mp->mnt_cred);
|
|
free(mp, M_MOUNT);
|
|
}
|
|
printf("Root mount failed: %d\n", error);
|
|
} else {
|
|
|
|
/* register with list of mounted filesystems */
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
|
|
/* sanity check system clock against root fs timestamp */
|
|
inittodr(mp->mnt_time);
|
|
vfs_unbusy(mp, curthread);
|
|
error = VFS_START(mp, 0, curthread);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Spin prompting on the console for a suitable root filesystem
|
|
*/
|
|
static int
|
|
vfs_mountroot_ask(void)
|
|
{
|
|
char name[128];
|
|
|
|
for(;;) {
|
|
printf("\nManual root filesystem specification:\n");
|
|
printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n");
|
|
#if defined(__i386__) || defined(__ia64__)
|
|
printf(" eg. ufs:da0s1a\n");
|
|
#else
|
|
printf(" eg. ufs:/dev/da0a\n");
|
|
#endif
|
|
printf(" ? List valid disk boot devices\n");
|
|
printf(" <empty line> Abort manual input\n");
|
|
printf("\nmountroot> ");
|
|
gets(name);
|
|
if (name[0] == 0)
|
|
return(1);
|
|
if (name[0] == '?') {
|
|
printf("\nList of GEOM managed disk devices:\n ");
|
|
g_dev_print();
|
|
continue;
|
|
}
|
|
if (!vfs_mountroot_try(name))
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Local helper function for vfs_mountroot_ask.
|
|
*/
|
|
static void
|
|
gets(char *cp)
|
|
{
|
|
char *lp;
|
|
int c;
|
|
|
|
lp = cp;
|
|
for (;;) {
|
|
printf("%c", c = cngetc() & 0177);
|
|
switch (c) {
|
|
case -1:
|
|
case '\n':
|
|
case '\r':
|
|
*lp++ = '\0';
|
|
return;
|
|
case '\b':
|
|
case '\177':
|
|
if (lp > cp) {
|
|
printf(" \b");
|
|
lp--;
|
|
}
|
|
continue;
|
|
case '#':
|
|
lp--;
|
|
if (lp < cp)
|
|
lp = cp;
|
|
continue;
|
|
case '@':
|
|
case 'u' & 037:
|
|
lp = cp;
|
|
printf("%c", '\n');
|
|
continue;
|
|
default:
|
|
*lp++ = c;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert a given name to the dev_t of the disk-like device
|
|
* it refers to.
|
|
*/
|
|
dev_t
|
|
getdiskbyname(char *name) {
|
|
char *cp;
|
|
dev_t dev;
|
|
|
|
cp = name;
|
|
if (!bcmp(cp, "/dev/", 5))
|
|
cp += 5;
|
|
|
|
dev = NODEV;
|
|
EVENTHANDLER_INVOKE(dev_clone, cp, strlen(cp), &dev);
|
|
return (dev);
|
|
}
|
|
|
|
/*
|
|
* Set rootdev to match (name), given that we expect it to
|
|
* refer to a disk-like device.
|
|
*/
|
|
static int
|
|
setrootbyname(char *name)
|
|
{
|
|
dev_t diskdev;
|
|
|
|
diskdev = getdiskbyname(name);
|
|
if (diskdev != NODEV) {
|
|
rootdev = diskdev;
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* Show the dev_t for a disk specified by name */
|
|
#ifdef DDB
|
|
DB_SHOW_COMMAND(disk, db_getdiskbyname)
|
|
{
|
|
dev_t dev;
|
|
|
|
if (modif[0] == '\0') {
|
|
db_error("usage: show disk/devicename");
|
|
return;
|
|
}
|
|
dev = getdiskbyname(modif);
|
|
if (dev != NODEV)
|
|
db_printf("dev_t = %p\n", dev);
|
|
else
|
|
db_printf("No disk device matched.\n");
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Get a mount option by its name.
|
|
*
|
|
* Return 0 if the option was found, ENOENT otherwise.
|
|
* If len is non-NULL it will be filled with the length
|
|
* of the option. If buf is non-NULL, it will be filled
|
|
* with the address of the option.
|
|
*/
|
|
int
|
|
vfs_getopt(opts, name, buf, len)
|
|
struct vfsoptlist *opts;
|
|
const char *name;
|
|
void **buf;
|
|
int *len;
|
|
{
|
|
struct vfsopt *opt;
|
|
|
|
KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
|
|
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
if (strcmp(name, opt->name) == 0) {
|
|
if (len != NULL)
|
|
*len = opt->len;
|
|
if (buf != NULL)
|
|
*buf = opt->value;
|
|
return (0);
|
|
}
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
/*
|
|
* Find and copy a mount option.
|
|
*
|
|
* The size of the buffer has to be specified
|
|
* in len, if it is not the same length as the
|
|
* mount option, EINVAL is returned.
|
|
* Returns ENOENT if the option is not found.
|
|
*/
|
|
int
|
|
vfs_copyopt(opts, name, dest, len)
|
|
struct vfsoptlist *opts;
|
|
const char *name;
|
|
void *dest;
|
|
int len;
|
|
{
|
|
struct vfsopt *opt;
|
|
|
|
KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
|
|
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
if (strcmp(name, opt->name) == 0) {
|
|
if (len != opt->len)
|
|
return (EINVAL);
|
|
bcopy(opt->value, dest, opt->len);
|
|
return (0);
|
|
}
|
|
}
|
|
return (ENOENT);
|
|
}
|