1993 lines
47 KiB
C
1993 lines
47 KiB
C
![]() |
/*-
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* Copyright (c) 1999-2004 Poul-Henning Kamp
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* Copyright (c) 1999 Michael Smith
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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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* 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 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
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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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#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/fcntl.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/libkern.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/priv.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/sbuf.h>
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#include <sys/syscallsubr.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 <vm/uma.h>
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#include <geom/geom.h>
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#include <machine/stdarg.h>
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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#define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
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static int vfs_domount(struct thread *td, const char *fstype, char *fspath,
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uint64_t fsflags, struct vfsoptlist **optlist);
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static void free_mntarg(struct mntarg *ma);
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static int usermount = 0;
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SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0,
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"Unprivileged users may mount and unmount file systems");
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MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
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static uma_zone_t mount_zone;
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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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MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
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/*
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* Global opts, taken by all filesystems
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*/
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static const char *global_opts[] = {
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"errmsg",
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"fstype",
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"fspath",
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"ro",
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"rw",
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"nosuid",
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"noexec",
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NULL
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};
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static int
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mount_init(void *mem, int size, int flags)
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{
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struct mount *mp;
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mp = (struct mount *)mem;
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mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
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lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
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return (0);
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}
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static void
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mount_fini(void *mem, int size)
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{
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struct mount *mp;
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mp = (struct mount *)mem;
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lockdestroy(&mp->mnt_explock);
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mtx_destroy(&mp->mnt_mtx);
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}
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static void
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vfs_mount_init(void *dummy __unused)
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{
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mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
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NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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}
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SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
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/*
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* ---------------------------------------------------------------------
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* Functions for building and sanitizing the mount options
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*/
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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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free(opt, M_MOUNT);
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}
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/* Release all resources related to the mount options. */
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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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void
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vfs_deleteopt(struct vfsoptlist *opts, const char *name)
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{
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struct vfsopt *opt, *temp;
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if (opts == NULL)
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return;
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TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
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if (strcmp(opt->name, name) == 0)
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vfs_freeopt(opts, opt);
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}
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}
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static int
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vfs_isopt_ro(const char *opt)
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{
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if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
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strcmp(opt, "norw") == 0)
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return (1);
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return (0);
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}
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static int
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vfs_isopt_rw(const char *opt)
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{
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if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
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return (1);
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return (0);
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}
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/*
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* Check if options are equal (with or without the "no" prefix).
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*/
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static int
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vfs_equalopts(const char *opt1, const char *opt2)
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{
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char *p;
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/* "opt" vs. "opt" or "noopt" vs. "noopt" */
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if (strcmp(opt1, opt2) == 0)
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return (1);
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/* "noopt" vs. "opt" */
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if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
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return (1);
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/* "opt" vs. "noopt" */
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if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
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return (1);
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while ((p = strchr(opt1, '.')) != NULL &&
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!strncmp(opt1, opt2, ++p - opt1)) {
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opt2 += p - opt1;
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opt1 = p;
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/* "foo.noopt" vs. "foo.opt" */
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if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
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return (1);
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/* "foo.opt" vs. "foo.noopt" */
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if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
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return (1);
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}
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/* "ro" / "rdonly" / "norw" / "rw" / "noro" */
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if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
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(vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
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return (1);
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return (0);
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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 occurrence 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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TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
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opt2 = TAILQ_PREV(opt, vfsoptlist, link);
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while (opt2 != NULL) {
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if (vfs_equalopts(opt->name, opt2->name)) {
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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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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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size_t memused, namelen, optlen;
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unsigned int i, iovcnt;
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int error;
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opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
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TAILQ_INIT(opts);
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memused = 0;
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iovcnt = auio->uio_iovcnt;
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for (i = 0; i < iovcnt; i += 2) {
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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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memused += sizeof(struct vfsopt) + optlen + namelen;
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/*
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* Avoid consuming too much memory, and attempts to overflow
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* memused.
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*/
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if (memused > VFS_MOUNTARG_SIZE_MAX ||
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optlen > VFS_MOUNTARG_SIZE_MAX ||
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namelen > VFS_MOUNTARG_SIZE_MAX) {
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error = EINVAL;
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goto bad;
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}
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opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
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opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
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opt->value = NULL;
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opt->len = 0;
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opt->pos = i / 2;
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opt->seen = 0;
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/*
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* Do this early, so jumps to "bad" will free the current
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* option.
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*/
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TAILQ_INSERT_TAIL(opts, opt, link);
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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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/* Ensure names are null-terminated strings. */
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if (namelen == 0 || opt->name[namelen - 1] != '\0') {
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error = EINVAL;
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goto bad;
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}
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if (optlen != 0) {
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opt->len = optlen;
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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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}
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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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* XXX: This function will keep a "nofoo" option in the new
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* options. E.g, if the option's canonical name is "foo",
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* "nofoo" ends up in the mount point's active options.
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*/
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static void
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vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
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{
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struct vfsopt *opt, *new;
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TAILQ_FOREACH(opt, oldopts, link) {
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new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
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new->name = strdup(opt->name, M_MOUNT);
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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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new->len = opt->len;
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new->seen = opt->seen;
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TAILQ_INSERT_HEAD(toopts, new, link);
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}
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vfs_sanitizeopts(toopts);
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}
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/*
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* Mount a filesystem.
|
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|
*/
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int
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sys_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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int error;
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u_int iovcnt;
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uint64_t flags;
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/*
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|
* Mount flags are now 64-bits. On 32-bit archtectures only
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* 32-bits are passed in, but from here on everything handles
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* 64-bit flags correctly.
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*/
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flags = uap->flags;
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AUDIT_ARG_FFLAGS(flags);
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CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
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uap->iovp, uap->iovcnt, flags);
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/*
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|
* Filter out MNT_ROOTFS. We do not want clients of nmount() in
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|
* userspace to set this flag, but we must filter it out if we want
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* MNT_UPDATE on the root file system to work.
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* MNT_ROOTFS should only be set by the kernel when mounting its
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* root file system.
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*/
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flags &= ~MNT_ROOTFS;
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iovcnt = uap->iovcnt;
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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)) {
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CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
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uap->iovcnt);
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return (EINVAL);
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}
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error = copyinuio(uap->iovp, iovcnt, &auio);
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|
if (error) {
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CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
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__func__, error);
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return (error);
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}
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error = vfs_donmount(td, flags, auio);
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|
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|
free(auio, M_IOV);
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|
return (error);
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}
|
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|
|
||
|
/*
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||
|
* ---------------------------------------------------------------------
|
||
|
* Various utility functions
|
||
|
*/
|
||
|
|
||
|
void
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||
|
vfs_ref(struct mount *mp)
|
||
|
{
|
||
|
|
||
|
CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
|
||
|
MNT_ILOCK(mp);
|
||
|
MNT_REF(mp);
|
||
|
MNT_IUNLOCK(mp);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
vfs_rel(struct mount *mp)
|
||
|
{
|
||
|
|
||
|
CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
|
||
|
MNT_ILOCK(mp);
|
||
|
MNT_REL(mp);
|
||
|
MNT_IUNLOCK(mp);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Allocate and initialize the mount point struct.
|
||
|
*/
|
||
|
struct mount *
|
||
|
vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
|
||
|
struct ucred *cred)
|
||
|
{
|
||
|
struct mount *mp;
|
||
|
|
||
|
mp = uma_zalloc(mount_zone, M_WAITOK);
|
||
|
bzero(&mp->mnt_startzero,
|
||
|
__rangeof(struct mount, mnt_startzero, mnt_endzero));
|
||
|
TAILQ_INIT(&mp->mnt_nvnodelist);
|
||
|
mp->mnt_nvnodelistsize = 0;
|
||
|
TAILQ_INIT(&mp->mnt_activevnodelist);
|
||
|
mp->mnt_activevnodelistsize = 0;
|
||
|
mp->mnt_ref = 0;
|
||
|
(void) vfs_busy(mp, MBF_NOWAIT);
|
||
|
atomic_add_acq_int(&vfsp->vfc_refcount, 1);
|
||
|
mp->mnt_op = vfsp->vfc_vfsops;
|
||
|
mp->mnt_vfc = vfsp;
|
||
|
mp->mnt_stat.f_type = vfsp->vfc_typenum;
|
||
|
mp->mnt_gen++;
|
||
|
strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
|
||
|
mp->mnt_vnodecovered = vp;
|
||
|
mp->mnt_cred = crdup(cred);
|
||
|
mp->mnt_stat.f_owner = cred->cr_uid;
|
||
|
strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
|
||
|
mp->mnt_iosize_max = DFLTPHYS;
|
||
|
#ifdef MAC
|
||
|
mac_mount_init(mp);
|
||
|
mac_mount_create(cred, mp);
|
||
|
#endif
|
||
|
arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
|
||
|
TAILQ_INIT(&mp->mnt_uppers);
|
||
|
return (mp);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Destroy the mount struct previously allocated by vfs_mount_alloc().
|
||
|
*/
|
||
|
void
|
||
|
vfs_mount_destroy(struct mount *mp)
|
||
|
{
|
||
|
|
||
|
MNT_ILOCK(mp);
|
||
|
mp->mnt_kern_flag |= MNTK_REFEXPIRE;
|
||
|
if (mp->mnt_kern_flag & MNTK_MWAIT) {
|
||
|
mp->mnt_kern_flag &= ~MNTK_MWAIT;
|
||
|
wakeup(mp);
|
||
|
}
|
||
|
while (mp->mnt_ref)
|
||
|
msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
|
||
|
KASSERT(mp->mnt_ref == 0,
|
||
|
("%s: invalid refcount in the drain path @ %s:%d", __func__,
|
||
|
__FILE__, __LINE__));
|
||
|
if (mp->mnt_writeopcount != 0)
|
||
|
panic("vfs_mount_destroy: nonzero writeopcount");
|
||
|
if (mp->mnt_secondary_writes != 0)
|
||
|
panic("vfs_mount_destroy: nonzero secondary_writes");
|
||
|
atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1);
|
||
|
if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
|
||
|
struct vnode *vp;
|
||
|
|
||
|
TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
|
||
|
vprint("", vp);
|
||
|
panic("unmount: dangling vnode");
|
||
|
}
|
||
|
KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers"));
|
||
|
if (mp->mnt_nvnodelistsize != 0)
|
||
|
panic("vfs_mount_destroy: nonzero nvnodelistsize");
|
||
|
if (mp->mnt_activevnodelistsize != 0)
|
||
|
panic("vfs_mount_destroy: nonzero activevnodelistsize");
|
||
|
if (mp->mnt_lockref != 0)
|
||
|
panic("vfs_mount_destroy: nonzero lock refcount");
|
||
|
MNT_IUNLOCK(mp);
|
||
|
#ifdef MAC
|
||
|
mac_mount_destroy(mp);
|
||
|
#endif
|
||
|
if (mp->mnt_opt != NULL)
|
||
|
vfs_freeopts(mp->mnt_opt);
|
||
|
crfree(mp->mnt_cred);
|
||
|
uma_zfree(mount_zone, mp);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
|
||
|
{
|
||
|
struct vfsoptlist *optlist;
|
||
|
struct vfsopt *opt, *tmp_opt;
|
||
|
char *fstype, *fspath, *errmsg;
|
||
|
int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
|
||
|
|
||
|
errmsg = fspath = NULL;
|
||
|
errmsg_len = fspathlen = 0;
|
||
|
errmsg_pos = -1;
|
||
|
|
||
|
error = vfs_buildopts(fsoptions, &optlist);
|
||
|
if (error)
|
||
|
return (error);
|
||
|
|
||
|
if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
|
||
|
errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
|
||
|
|
||
|
/*
|
||
|
* 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;
|
||
|
if (errmsg != NULL)
|
||
|
strncpy(errmsg, "Invalid fstype", errmsg_len);
|
||
|
goto bail;
|
||
|
}
|
||
|
fspathlen = 0;
|
||
|
error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
|
||
|
if (error || fspath[fspathlen - 1] != '\0') {
|
||
|
error = EINVAL;
|
||
|
if (errmsg != NULL)
|
||
|
strncpy(errmsg, "Invalid fspath", errmsg_len);
|
||
|
goto bail;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We need to see if we have the "update" option
|
||
|
* before we call vfs_domount(), since vfs_domount() has special
|
||
|
* logic based on MNT_UPDATE. This is very important
|
||
|
* when we want to update the root filesystem.
|
||
|
*/
|
||
|
TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
|
||
|
if (strcmp(opt->name, "update") == 0) {
|
||
|
fsflags |= MNT_UPDATE;
|
||
|
vfs_freeopt(optlist, opt);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "async") == 0)
|
||
|
fsflags |= MNT_ASYNC;
|
||
|
else if (strcmp(opt->name, "force") == 0) {
|
||
|
fsflags |= MNT_FORCE;
|
||
|
vfs_freeopt(optlist, opt);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "reload") == 0) {
|
||
|
fsflags |= MNT_RELOAD;
|
||
|
vfs_freeopt(optlist, opt);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "multilabel") == 0)
|
||
|
fsflags |= MNT_MULTILABEL;
|
||
|
else if (strcmp(opt->name, "noasync") == 0)
|
||
|
fsflags &= ~MNT_ASYNC;
|
||
|
else if (strcmp(opt->name, "noatime") == 0)
|
||
|
fsflags |= MNT_NOATIME;
|
||
|
else if (strcmp(opt->name, "atime") == 0) {
|
||
|
free(opt->name, M_MOUNT);
|
||
|
opt->name = strdup("nonoatime", M_MOUNT);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "noclusterr") == 0)
|
||
|
fsflags |= MNT_NOCLUSTERR;
|
||
|
else if (strcmp(opt->name, "clusterr") == 0) {
|
||
|
free(opt->name, M_MOUNT);
|
||
|
opt->name = strdup("nonoclusterr", M_MOUNT);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "noclusterw") == 0)
|
||
|
fsflags |= MNT_NOCLUSTERW;
|
||
|
else if (strcmp(opt->name, "clusterw") == 0) {
|
||
|
free(opt->name, M_MOUNT);
|
||
|
opt->name = strdup("nonoclusterw", M_MOUNT);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "noexec") == 0)
|
||
|
fsflags |= MNT_NOEXEC;
|
||
|
else if (strcmp(opt->name, "exec") == 0) {
|
||
|
free(opt->name, M_MOUNT);
|
||
|
opt->name = strdup("nonoexec", M_MOUNT);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "nosuid") == 0)
|
||
|
fsflags |= MNT_NOSUID;
|
||
|
else if (strcmp(opt->name, "suid") == 0) {
|
||
|
free(opt->name, M_MOUNT);
|
||
|
opt->name = strdup("nonosuid", M_MOUNT);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "nosymfollow") == 0)
|
||
|
fsflags |= MNT_NOSYMFOLLOW;
|
||
|
else if (strcmp(opt->name, "symfollow") == 0) {
|
||
|
free(opt->name, M_MOUNT);
|
||
|
opt->name = strdup("nonosymfollow", M_MOUNT);
|
||
|
}
|
||
|
else if (strcmp(opt->name, "noro") == 0)
|
||
|
fsflags &= ~MNT_RDONLY;
|
||
|
else if (strcmp(opt->name, "rw") == 0)
|
||
|
fsflags &= ~MNT_RDONLY;
|
||
|
else if (strcmp(opt->name, "ro") == 0)
|
||
|
fsflags |= MNT_RDONLY;
|
||
|
else if (strcmp(opt->name, "rdonly") == 0) {
|
||
|
free(opt->name, M_MOUNT);
|
||
|
opt->name = strdup("ro", M_MOUNT);
|
||
|
fsflags |= MNT_RDONLY;
|
||
|
}
|
||
|
else if (strcmp(opt->name, "suiddir") == 0)
|
||
|
fsflags |= MNT_SUIDDIR;
|
||
|
else if (strcmp(opt->name, "sync") == 0)
|
||
|
fsflags |= MNT_SYNCHRONOUS;
|
||
|
else if (strcmp(opt->name, "union") == 0)
|
||
|
fsflags |= MNT_UNION;
|
||
|
else if (strcmp(opt->name, "automounted") == 0) {
|
||
|
fsflags |= MNT_AUTOMOUNTED;
|
||
|
vfs_freeopt(optlist, opt);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Be ultra-paranoid about making sure the type and fspath
|
||
|
* variables will fit in our mp buffers, including the
|
||
|
* terminating NUL.
|
||
|
*/
|
||
|
if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) {
|
||
|
error = ENAMETOOLONG;
|
||
|
goto bail;
|
||
|
}
|
||
|
|
||
|
error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
|
||
|
bail:
|
||
|
/* copyout the errmsg */
|
||
|
if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
|
||
|
&& errmsg_len > 0 && errmsg != NULL) {
|
||
|
if (fsoptions->uio_segflg == UIO_SYSSPACE) {
|
||
|
bcopy(errmsg,
|
||
|
fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
|
||
|
fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
|
||
|
} else {
|
||
|
copyout(errmsg,
|
||
|
fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
|
||
|
fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (optlist != NULL)
|
||
|
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
|
||
|
sys_mount(td, uap)
|
||
|
struct thread *td;
|
||
|
struct mount_args /* {
|
||
|
char *type;
|
||
|
char *path;
|
||
|
int flags;
|
||
|
caddr_t data;
|
||
|
} */ *uap;
|
||
|
{
|
||
|
char *fstype;
|
||
|
struct vfsconf *vfsp = NULL;
|
||
|
struct mntarg *ma = NULL;
|
||
|
uint64_t flags;
|
||
|
int error;
|
||
|
|
||
|
/*
|
||
|
* Mount flags are now 64-bits. On 32-bit architectures only
|
||
|
* 32-bits are passed in, but from here on everything handles
|
||
|
* 64-bit flags correctly.
|
||
|
*/
|
||
|
flags = uap->flags;
|
||
|
|
||
|
AUDIT_ARG_FFLAGS(flags);
|
||
|
|
||
|
/*
|
||
|
* Filter out MNT_ROOTFS. We do not want clients of mount() in
|
||
|
* userspace to set this flag, but we must filter it out if we want
|
||
|
* MNT_UPDATE on the root file system to work.
|
||
|
* MNT_ROOTFS should only be set by the kernel when mounting its
|
||
|
* root file system.
|
||
|
*/
|
||
|
flags &= ~MNT_ROOTFS;
|
||
|
|
||
|
fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
|
||
|
error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
|
||
|
if (error) {
|
||
|
free(fstype, M_TEMP);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
AUDIT_ARG_TEXT(fstype);
|
||
|
vfsp = vfs_byname_kld(fstype, td, &error);
|
||
|
free(fstype, M_TEMP);
|
||
|
if (vfsp == NULL)
|
||
|
return (ENOENT);
|
||
|
if (vfsp->vfc_vfsops->vfs_cmount == NULL)
|
||
|
return (EOPNOTSUPP);
|
||
|
|
||
|
ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN);
|
||
|
ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
|
||
|
ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
|
||
|
ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
|
||
|
ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
|
||
|
|
||
|
error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* vfs_domount_first(): first file system mount (not update)
|
||
|
*/
|
||
|
static int
|
||
|
vfs_domount_first(
|
||
|
struct thread *td, /* Calling thread. */
|
||
|
struct vfsconf *vfsp, /* File system type. */
|
||
|
char *fspath, /* Mount path. */
|
||
|
struct vnode *vp, /* Vnode to be covered. */
|
||
|
uint64_t fsflags, /* Flags common to all filesystems. */
|
||
|
struct vfsoptlist **optlist /* Options local to the filesystem. */
|
||
|
)
|
||
|
{
|
||
|
struct vattr va;
|
||
|
struct mount *mp;
|
||
|
struct vnode *newdp;
|
||
|
int error;
|
||
|
|
||
|
ASSERT_VOP_ELOCKED(vp, __func__);
|
||
|
KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
|
||
|
|
||
|
/*
|
||
|
* 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);
|
||
|
if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
|
||
|
error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
|
||
|
if (error == 0)
|
||
|
error = vinvalbuf(vp, V_SAVE, 0, 0);
|
||
|
if (error == 0 && vp->v_type != VDIR)
|
||
|
error = ENOTDIR;
|
||
|
if (error == 0) {
|
||
|
VI_LOCK(vp);
|
||
|
if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
|
||
|
vp->v_iflag |= VI_MOUNT;
|
||
|
else
|
||
|
error = EBUSY;
|
||
|
VI_UNLOCK(vp);
|
||
|
}
|
||
|
if (error != 0) {
|
||
|
vput(vp);
|
||
|
return (error);
|
||
|
}
|
||
|
VOP_UNLOCK(vp, 0);
|
||
|
|
||
|
/* Allocate and initialize the filesystem. */
|
||
|
mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
|
||
|
/* XXXMAC: pass to vfs_mount_alloc? */
|
||
|
mp->mnt_optnew = *optlist;
|
||
|
/* Set the mount level flags. */
|
||
|
mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
|
||
|
|
||
|
/*
|
||
|
* 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);
|
||
|
if (error != 0) {
|
||
|
vfs_unbusy(mp);
|
||
|
vfs_mount_destroy(mp);
|
||
|
VI_LOCK(vp);
|
||
|
vp->v_iflag &= ~VI_MOUNT;
|
||
|
VI_UNLOCK(vp);
|
||
|
vrele(vp);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
if (mp->mnt_opt != NULL)
|
||
|
vfs_freeopts(mp->mnt_opt);
|
||
|
mp->mnt_opt = mp->mnt_optnew;
|
||
|
*optlist = NULL;
|
||
|
(void)VFS_STATFS(mp, &mp->mnt_stat);
|
||
|
|
||
|
/*
|
||
|
* Prevent external consumers of mount options from reading mnt_optnew.
|
||
|
*/
|
||
|
mp->mnt_optnew = NULL;
|
||
|
|
||
|
MNT_ILOCK(mp);
|
||
|
if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
|
||
|
(mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
|
||
|
mp->mnt_kern_flag |= MNTK_ASYNC;
|
||
|
else
|
||
|
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
||
|
MNT_IUNLOCK(mp);
|
||
|
|
||
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
||
|
cache_purge(vp);
|
||
|
VI_LOCK(vp);
|
||
|
vp->v_iflag &= ~VI_MOUNT;
|
||
|
VI_UNLOCK(vp);
|
||
|
vp->v_mountedhere = mp;
|
||
|
/* Place the new filesystem at the end of the mount list. */
|
||
|
mtx_lock(&mountlist_mtx);
|
||
|
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
||
|
mtx_unlock(&mountlist_mtx);
|
||
|
vfs_event_signal(NULL, VQ_MOUNT, 0);
|
||
|
if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
|
||
|
panic("mount: lost mount");
|
||
|
VOP_UNLOCK(vp, 0);
|
||
|
EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td);
|
||
|
VOP_UNLOCK(newdp, 0);
|
||
|
mountcheckdirs(vp, newdp);
|
||
|
vrele(newdp);
|
||
|
if ((mp->mnt_flag & MNT_RDONLY) == 0)
|
||
|
vfs_allocate_syncvnode(mp);
|
||
|
vfs_unbusy(mp);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* vfs_domount_update(): update of mounted file system
|
||
|
*/
|
||
|
static int
|
||
|
vfs_domount_update(
|
||
|
struct thread *td, /* Calling thread. */
|
||
|
struct vnode *vp, /* Mount point vnode. */
|
||
|
uint64_t fsflags, /* Flags common to all filesystems. */
|
||
|
struct vfsoptlist **optlist /* Options local to the filesystem. */
|
||
|
)
|
||
|
{
|
||
|
struct export_args export;
|
||
|
void *bufp;
|
||
|
struct mount *mp;
|
||
|
int error, export_error, len;
|
||
|
uint64_t flag;
|
||
|
|
||
|
ASSERT_VOP_ELOCKED(vp, __func__);
|
||
|
KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
|
||
|
mp = vp->v_mount;
|
||
|
|
||
|
if ((vp->v_vflag & VV_ROOT) == 0) {
|
||
|
if (vfs_copyopt(*optlist, "export", &export, sizeof(export))
|
||
|
== 0)
|
||
|
error = EXDEV;
|
||
|
else
|
||
|
error = EINVAL;
|
||
|
vput(vp);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We only allow the filesystem to be reloaded if it
|
||
|
* is currently mounted read-only.
|
||
|
*/
|
||
|
flag = mp->mnt_flag;
|
||
|
if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
|
||
|
vput(vp);
|
||
|
return (EOPNOTSUPP); /* Needs translation */
|
||
|
}
|
||
|
/*
|
||
|
* Only privileged root, or (if MNT_USER is set) the user that
|
||
|
* did the original mount is permitted to update it.
|
||
|
*/
|
||
|
error = vfs_suser(mp, td);
|
||
|
if (error != 0) {
|
||
|
vput(vp);
|
||
|
return (error);
|
||
|
}
|
||
|
if (vfs_busy(mp, MBF_NOWAIT)) {
|
||
|
vput(vp);
|
||
|
return (EBUSY);
|
||
|
}
|
||
|
VI_LOCK(vp);
|
||
|
if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
|
||
|
VI_UNLOCK(vp);
|
||
|
vfs_unbusy(mp);
|
||
|
vput(vp);
|
||
|
return (EBUSY);
|
||
|
}
|
||
|
vp->v_iflag |= VI_MOUNT;
|
||
|
VI_UNLOCK(vp);
|
||
|
VOP_UNLOCK(vp, 0);
|
||
|
|
||
|
MNT_ILOCK(mp);
|
||
|
mp->mnt_flag &= ~MNT_UPDATEMASK;
|
||
|
mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
|
||
|
MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
|
||
|
if ((mp->mnt_flag & MNT_ASYNC) == 0)
|
||
|
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
||
|
MNT_IUNLOCK(mp);
|
||
|
mp->mnt_optnew = *optlist;
|
||
|
vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
|
||
|
|
||
|
/*
|
||
|
* 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);
|
||
|
|
||
|
export_error = 0;
|
||
|
/* Process the export option. */
|
||
|
if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp,
|
||
|
&len) == 0) {
|
||
|
/* Assume that there is only 1 ABI for each length. */
|
||
|
switch (len) {
|
||
|
case (sizeof(struct oexport_args)):
|
||
|
bzero(&export, sizeof(export));
|
||
|
/* FALLTHROUGH */
|
||
|
case (sizeof(export)):
|
||
|
bcopy(bufp, &export, len);
|
||
|
export_error = vfs_export(mp, &export);
|
||
|
break;
|
||
|
default:
|
||
|
export_error = EINVAL;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
MNT_ILOCK(mp);
|
||
|
if (error == 0) {
|
||
|
mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
|
||
|
MNT_SNAPSHOT);
|
||
|
} else {
|
||
|
/*
|
||
|
* If we fail, restore old mount flags. MNT_QUOTA is special,
|
||
|
* because it is not part of MNT_UPDATEMASK, but it could have
|
||
|
* changed in the meantime if quotactl(2) was called.
|
||
|
* All in all we want current value of MNT_QUOTA, not the old
|
||
|
* one.
|
||
|
*/
|
||
|
mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
|
||
|
}
|
||
|
if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
|
||
|
(mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
|
||
|
mp->mnt_kern_flag |= MNTK_ASYNC;
|
||
|
else
|
||
|
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
||
|
MNT_IUNLOCK(mp);
|
||
|
|
||
|
if (error != 0)
|
||
|
goto end;
|
||
|
|
||
|
if (mp->mnt_opt != NULL)
|
||
|
vfs_freeopts(mp->mnt_opt);
|
||
|
mp->mnt_opt = mp->mnt_optnew;
|
||
|
*optlist = NULL;
|
||
|
(void)VFS_STATFS(mp, &mp->mnt_stat);
|
||
|
/*
|
||
|
* Prevent external consumers of mount options from reading
|
||
|
* mnt_optnew.
|
||
|
*/
|
||
|
mp->mnt_optnew = NULL;
|
||
|
|
||
|
if ((mp->mnt_flag & MNT_RDONLY) == 0)
|
||
|
vfs_allocate_syncvnode(mp);
|
||
|
else
|
||
|
vfs_deallocate_syncvnode(mp);
|
||
|
end:
|
||
|
vfs_unbusy(mp);
|
||
|
VI_LOCK(vp);
|
||
|
vp->v_iflag &= ~VI_MOUNT;
|
||
|
VI_UNLOCK(vp);
|
||
|
vrele(vp);
|
||
|
return (error != 0 ? error : export_error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* vfs_domount(): actually attempt a filesystem mount.
|
||
|
*/
|
||
|
static int
|
||
|
vfs_domount(
|
||
|
struct thread *td, /* Calling thread. */
|
||
|
const char *fstype, /* Filesystem type. */
|
||
|
char *fspath, /* Mount path. */
|
||
|
uint64_t fsflags, /* Flags common to all filesystems. */
|
||
|
struct vfsoptlist **optlist /* Options local to the filesystem. */
|
||
|
)
|
||
|
{
|
||
|
struct vfsconf *vfsp;
|
||
|
struct nameidata nd;
|
||
|
struct vnode *vp;
|
||
|
char *pathbuf;
|
||
|
int error;
|
||
|
|
||
|
/*
|
||
|
* 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 (jailed(td->td_ucred) || usermount == 0) {
|
||
|
if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
|
||
|
*/
|
||
|
if (fsflags & MNT_EXPORTED) {
|
||
|
error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
|
||
|
if (error)
|
||
|
return (error);
|
||
|
}
|
||
|
if (fsflags & MNT_SUIDDIR) {
|
||
|
error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
|
||
|
if (error)
|
||
|
return (error);
|
||
|
}
|
||
|
/*
|
||
|
* Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
|
||
|
*/
|
||
|
if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
|
||
|
if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
|
||
|
fsflags |= MNT_NOSUID | MNT_USER;
|
||
|
}
|
||
|
|
||
|
/* Load KLDs before we lock the covered vnode to avoid reversals. */
|
||
|
vfsp = NULL;
|
||
|
if ((fsflags & MNT_UPDATE) == 0) {
|
||
|
/* Don't try to load KLDs if we're mounting the root. */
|
||
|
if (fsflags & MNT_ROOTFS)
|
||
|
vfsp = vfs_byname(fstype);
|
||
|
else
|
||
|
vfsp = vfs_byname_kld(fstype, td, &error);
|
||
|
if (vfsp == NULL)
|
||
|
return (ENODEV);
|
||
|
if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
|
||
|
return (EPERM);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
|
||
|
*/
|
||
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
|
||
|
UIO_SYSSPACE, fspath, td);
|
||
|
error = namei(&nd);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||
|
vp = nd.ni_vp;
|
||
|
if ((fsflags & MNT_UPDATE) == 0) {
|
||
|
pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
|
||
|
strcpy(pathbuf, fspath);
|
||
|
error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
|
||
|
/* debug.disablefullpath == 1 results in ENODEV */
|
||
|
if (error == 0 || error == ENODEV) {
|
||
|
error = vfs_domount_first(td, vfsp, pathbuf, vp,
|
||
|
fsflags, optlist);
|
||
|
}
|
||
|
free(pathbuf, M_TEMP);
|
||
|
} else
|
||
|
error = vfs_domount_update(td, vp, fsflags, optlist);
|
||
|
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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
|
||
|
sys_unmount(struct thread *td, struct unmount_args *uap)
|
||
|
{
|
||
|
struct nameidata nd;
|
||
|
struct mount *mp;
|
||
|
char *pathbuf;
|
||
|
int error, id0, id1;
|
||
|
|
||
|
AUDIT_ARG_VALUE(uap->flags);
|
||
|
if (jailed(td->td_ucred) || usermount == 0) {
|
||
|
error = priv_check(td, PRIV_VFS_UNMOUNT);
|
||
|
if (error)
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
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) {
|
||
|
AUDIT_ARG_TEXT(pathbuf);
|
||
|
/* 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) {
|
||
|
vfs_ref(mp);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
mtx_unlock(&mountlist_mtx);
|
||
|
} else {
|
||
|
/*
|
||
|
* Try to find global path for path argument.
|
||
|
*/
|
||
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
|
||
|
UIO_SYSSPACE, pathbuf, td);
|
||
|
if (namei(&nd) == 0) {
|
||
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||
|
error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
|
||
|
MNAMELEN);
|
||
|
if (error == 0 || error == ENODEV)
|
||
|
vput(nd.ni_vp);
|
||
|
}
|
||
|
mtx_lock(&mountlist_mtx);
|
||
|
TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
|
||
|
if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) {
|
||
|
vfs_ref(mp);
|
||
|
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);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Don't allow unmounting the root filesystem.
|
||
|
*/
|
||
|
if (mp->mnt_flag & MNT_ROOTFS) {
|
||
|
vfs_rel(mp);
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
error = dounmount(mp, uap->flags, td);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Return error if any of the vnodes, ignoring the root vnode
|
||
|
* and the syncer vnode, have non-zero usecount.
|
||
|
*/
|
||
|
static int
|
||
|
vfs_check_usecounts(struct mount *mp)
|
||
|
{
|
||
|
struct vnode *vp, *mvp;
|
||
|
|
||
|
MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
|
||
|
if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON &&
|
||
|
vp->v_usecount != 0) {
|
||
|
VI_UNLOCK(vp);
|
||
|
MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
|
||
|
return (EBUSY);
|
||
|
}
|
||
|
VI_UNLOCK(vp);
|
||
|
}
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Do the actual filesystem unmount.
|
||
|
*/
|
||
|
int
|
||
|
dounmount(struct mount *mp, int flags, struct thread *td)
|
||
|
{
|
||
|
struct vnode *coveredvp, *fsrootvp;
|
||
|
int error;
|
||
|
uint64_t async_flag;
|
||
|
int mnt_gen_r;
|
||
|
|
||
|
if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
|
||
|
mnt_gen_r = mp->mnt_gen;
|
||
|
VI_LOCK(coveredvp);
|
||
|
vholdl(coveredvp);
|
||
|
vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
|
||
|
/*
|
||
|
* Check for mp being unmounted while waiting for the
|
||
|
* covered vnode lock.
|
||
|
*/
|
||
|
if (coveredvp->v_mountedhere != mp ||
|
||
|
coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
|
||
|
VOP_UNLOCK(coveredvp, 0);
|
||
|
vdrop(coveredvp);
|
||
|
vfs_rel(mp);
|
||
|
return (EBUSY);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Only privileged root, or (if MNT_USER is set) the user that did the
|
||
|
* original mount is permitted to unmount this filesystem.
|
||
|
*/
|
||
|
error = vfs_suser(mp, td);
|
||
|
if (error != 0) {
|
||
|
if (coveredvp != NULL) {
|
||
|
VOP_UNLOCK(coveredvp, 0);
|
||
|
vdrop(coveredvp);
|
||
|
}
|
||
|
vfs_rel(mp);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
vn_start_write(NULL, &mp, V_WAIT | V_MNTREF);
|
||
|
MNT_ILOCK(mp);
|
||
|
if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 ||
|
||
|
!TAILQ_EMPTY(&mp->mnt_uppers)) {
|
||
|
MNT_IUNLOCK(mp);
|
||
|
if (coveredvp != NULL) {
|
||
|
VOP_UNLOCK(coveredvp, 0);
|
||
|
vdrop(coveredvp);
|
||
|
}
|
||
|
vn_finished_write(mp);
|
||
|
return (EBUSY);
|
||
|
}
|
||
|
mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
|
||
|
if (flags & MNT_NONBUSY) {
|
||
|
MNT_IUNLOCK(mp);
|
||
|
error = vfs_check_usecounts(mp);
|
||
|
MNT_ILOCK(mp);
|
||
|
if (error != 0) {
|
||
|
mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ);
|
||
|
MNT_IUNLOCK(mp);
|
||
|
if (coveredvp != NULL) {
|
||
|
VOP_UNLOCK(coveredvp, 0);
|
||
|
vdrop(coveredvp);
|
||
|
}
|
||
|
vn_finished_write(mp);
|
||
|
return (error);
|
||
|
}
|
||
|
}
|
||
|
/* Allow filesystems to detect that a forced unmount is in progress. */
|
||
|
if (flags & MNT_FORCE) {
|
||
|
mp->mnt_kern_flag |= MNTK_UNMOUNTF;
|
||
|
MNT_IUNLOCK(mp);
|
||
|
/*
|
||
|
* Must be done after setting MNTK_UNMOUNTF and before
|
||
|
* waiting for mnt_lockref to become 0.
|
||
|
*/
|
||
|
VFS_PURGE(mp);
|
||
|
MNT_ILOCK(mp);
|
||
|
}
|
||
|
error = 0;
|
||
|
if (mp->mnt_lockref) {
|
||
|
mp->mnt_kern_flag |= MNTK_DRAINING;
|
||
|
error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
|
||
|
"mount drain", 0);
|
||
|
}
|
||
|
MNT_IUNLOCK(mp);
|
||
|
KASSERT(mp->mnt_lockref == 0,
|
||
|
("%s: invalid lock refcount in the drain path @ %s:%d",
|
||
|
__func__, __FILE__, __LINE__));
|
||
|
KASSERT(error == 0,
|
||
|
("%s: invalid return value for msleep in the drain path @ %s:%d",
|
||
|
__func__, __FILE__, __LINE__));
|
||
|
|
||
|
if (mp->mnt_flag & MNT_EXPUBLIC)
|
||
|
vfs_setpublicfs(NULL, NULL, NULL);
|
||
|
|
||
|
/*
|
||
|
* From now, we can claim that the use reference on the
|
||
|
* coveredvp is ours, and the ref can be released only by
|
||
|
* successfull unmount by us, or left for later unmount
|
||
|
* attempt. The previously acquired hold reference is no
|
||
|
* longer needed to protect the vnode from reuse.
|
||
|
*/
|
||
|
if (coveredvp != NULL)
|
||
|
vdrop(coveredvp);
|
||
|
|
||
|
vfs_msync(mp, MNT_WAIT);
|
||
|
MNT_ILOCK(mp);
|
||
|
async_flag = mp->mnt_flag & MNT_ASYNC;
|
||
|
mp->mnt_flag &= ~MNT_ASYNC;
|
||
|
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
||
|
MNT_IUNLOCK(mp);
|
||
|
cache_purgevfs(mp); /* remove cache entries for this file sys */
|
||
|
vfs_deallocate_syncvnode(mp);
|
||
|
/*
|
||
|
* For forced unmounts, move process cdir/rdir refs on the fs root
|
||
|
* vnode to the covered vnode. For non-forced unmounts we want
|
||
|
* such references to cause an EBUSY error.
|
||
|
*/
|
||
|
if ((flags & MNT_FORCE) &&
|
||
|
VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
|
||
|
if (mp->mnt_vnodecovered != NULL &&
|
||
|
(mp->mnt_flag & MNT_IGNORE) == 0)
|
||
|
mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
|
||
|
if (fsrootvp == rootvnode) {
|
||
|
vrele(rootvnode);
|
||
|
rootvnode = NULL;
|
||
|
}
|
||
|
vput(fsrootvp);
|
||
|
}
|
||
|
if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 ||
|
||
|
(error = VFS_SYNC(mp, MNT_WAIT)) == 0)
|
||
|
error = VFS_UNMOUNT(mp, flags);
|
||
|
vn_finished_write(mp);
|
||
|
/*
|
||
|
* If we failed to flush the dirty blocks for this mount point,
|
||
|
* undo all the cdir/rdir and rootvnode changes we made above.
|
||
|
* Unless we failed to do so because the device is reporting that
|
||
|
* it doesn't exist anymore.
|
||
|
*/
|
||
|
if (error && error != ENXIO) {
|
||
|
if ((flags & MNT_FORCE) &&
|
||
|
VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
|
||
|
if (mp->mnt_vnodecovered != NULL &&
|
||
|
(mp->mnt_flag & MNT_IGNORE) == 0)
|
||
|
mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
|
||
|
if (rootvnode == NULL) {
|
||
|
rootvnode = fsrootvp;
|
||
|
vref(rootvnode);
|
||
|
}
|
||
|
vput(fsrootvp);
|
||
|
}
|
||
|
MNT_ILOCK(mp);
|
||
|
mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
|
||
|
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
|
||
|
MNT_IUNLOCK(mp);
|
||
|
vfs_allocate_syncvnode(mp);
|
||
|
MNT_ILOCK(mp);
|
||
|
}
|
||
|
mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
|
||
|
mp->mnt_flag |= async_flag;
|
||
|
if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
|
||
|
(mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
|
||
|
mp->mnt_kern_flag |= MNTK_ASYNC;
|
||
|
if (mp->mnt_kern_flag & MNTK_MWAIT) {
|
||
|
mp->mnt_kern_flag &= ~MNTK_MWAIT;
|
||
|
wakeup(mp);
|
||
|
}
|
||
|
MNT_IUNLOCK(mp);
|
||
|
if (coveredvp)
|
||
|
VOP_UNLOCK(coveredvp, 0);
|
||
|
return (error);
|
||
|
}
|
||
|
mtx_lock(&mountlist_mtx);
|
||
|
TAILQ_REMOVE(&mountlist, mp, mnt_list);
|
||
|
mtx_unlock(&mountlist_mtx);
|
||
|
EVENTHANDLER_INVOKE(vfs_unmounted, mp, td);
|
||
|
if (coveredvp != NULL) {
|
||
|
coveredvp->v_mountedhere = NULL;
|
||
|
vput(coveredvp);
|
||
|
}
|
||
|
vfs_event_signal(NULL, VQ_UNMOUNT, 0);
|
||
|
if (mp == rootdevmp)
|
||
|
rootdevmp = NULL;
|
||
|
vfs_mount_destroy(mp);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Report errors during filesystem mounting.
|
||
|
*/
|
||
|
void
|
||
|
vfs_mount_error(struct mount *mp, const char *fmt, ...)
|
||
|
{
|
||
|
struct vfsoptlist *moptlist = mp->mnt_optnew;
|
||
|
va_list ap;
|
||
|
int error, len;
|
||
|
char *errmsg;
|
||
|
|
||
|
error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
|
||
|
if (error || errmsg == NULL || len <= 0)
|
||
|
return;
|
||
|
|
||
|
va_start(ap, fmt);
|
||
|
vsnprintf(errmsg, (size_t)len, fmt, ap);
|
||
|
va_end(ap);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
|
||
|
{
|
||
|
va_list ap;
|
||
|
int error, len;
|
||
|
char *errmsg;
|
||
|
|
||
|
error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
|
||
|
if (error || errmsg == NULL || len <= 0)
|
||
|
return;
|
||
|
|
||
|
va_start(ap, fmt);
|
||
|
vsnprintf(errmsg, (size_t)len, fmt, ap);
|
||
|
va_end(ap);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* ---------------------------------------------------------------------
|
||
|
* Functions for querying mount options/arguments from filesystems.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* Check that no unknown options are given
|
||
|
*/
|
||
|
int
|
||
|
vfs_filteropt(struct vfsoptlist *opts, const char **legal)
|
||
|
{
|
||
|
struct vfsopt *opt;
|
||
|
char errmsg[255];
|
||
|
const char **t, *p, *q;
|
||
|
int ret = 0;
|
||
|
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
p = opt->name;
|
||
|
q = NULL;
|
||
|
if (p[0] == 'n' && p[1] == 'o')
|
||
|
q = p + 2;
|
||
|
for(t = global_opts; *t != NULL; t++) {
|
||
|
if (strcmp(*t, p) == 0)
|
||
|
break;
|
||
|
if (q != NULL) {
|
||
|
if (strcmp(*t, q) == 0)
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (*t != NULL)
|
||
|
continue;
|
||
|
for(t = legal; *t != NULL; t++) {
|
||
|
if (strcmp(*t, p) == 0)
|
||
|
break;
|
||
|
if (q != NULL) {
|
||
|
if (strcmp(*t, q) == 0)
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (*t != NULL)
|
||
|
continue;
|
||
|
snprintf(errmsg, sizeof(errmsg),
|
||
|
"mount option <%s> is unknown", p);
|
||
|
ret = EINVAL;
|
||
|
}
|
||
|
if (ret != 0) {
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(opt->name, "errmsg") == 0) {
|
||
|
strncpy((char *)opt->value, errmsg, opt->len);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (opt == NULL)
|
||
|
printf("%s\n", errmsg);
|
||
|
}
|
||
|
return (ret);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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) {
|
||
|
opt->seen = 1;
|
||
|
if (len != NULL)
|
||
|
*len = opt->len;
|
||
|
if (buf != NULL)
|
||
|
*buf = opt->value;
|
||
|
return (0);
|
||
|
}
|
||
|
}
|
||
|
return (ENOENT);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
|
||
|
{
|
||
|
struct vfsopt *opt;
|
||
|
|
||
|
if (opts == NULL)
|
||
|
return (-1);
|
||
|
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(name, opt->name) == 0) {
|
||
|
opt->seen = 1;
|
||
|
return (opt->pos);
|
||
|
}
|
||
|
}
|
||
|
return (-1);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
|
||
|
{
|
||
|
char *opt_value, *vtp;
|
||
|
quad_t iv;
|
||
|
int error, opt_len;
|
||
|
|
||
|
error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
|
||
|
if (error != 0)
|
||
|
return (error);
|
||
|
if (opt_len == 0 || opt_value == NULL)
|
||
|
return (EINVAL);
|
||
|
if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
|
||
|
return (EINVAL);
|
||
|
iv = strtoq(opt_value, &vtp, 0);
|
||
|
if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
|
||
|
return (EINVAL);
|
||
|
if (iv < 0)
|
||
|
return (EINVAL);
|
||
|
switch (vtp[0]) {
|
||
|
case 't':
|
||
|
case 'T':
|
||
|
iv *= 1024;
|
||
|
case 'g':
|
||
|
case 'G':
|
||
|
iv *= 1024;
|
||
|
case 'm':
|
||
|
case 'M':
|
||
|
iv *= 1024;
|
||
|
case 'k':
|
||
|
case 'K':
|
||
|
iv *= 1024;
|
||
|
case '\0':
|
||
|
break;
|
||
|
default:
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
*value = iv;
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
char *
|
||
|
vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
|
||
|
{
|
||
|
struct vfsopt *opt;
|
||
|
|
||
|
*error = 0;
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(name, opt->name) != 0)
|
||
|
continue;
|
||
|
opt->seen = 1;
|
||
|
if (opt->len == 0 ||
|
||
|
((char *)opt->value)[opt->len - 1] != '\0') {
|
||
|
*error = EINVAL;
|
||
|
return (NULL);
|
||
|
}
|
||
|
return (opt->value);
|
||
|
}
|
||
|
*error = ENOENT;
|
||
|
return (NULL);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
|
||
|
uint64_t val)
|
||
|
{
|
||
|
struct vfsopt *opt;
|
||
|
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(name, opt->name) == 0) {
|
||
|
opt->seen = 1;
|
||
|
if (w != NULL)
|
||
|
*w |= val;
|
||
|
return (1);
|
||
|
}
|
||
|
}
|
||
|
if (w != NULL)
|
||
|
*w &= ~val;
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
|
||
|
{
|
||
|
va_list ap;
|
||
|
struct vfsopt *opt;
|
||
|
int ret;
|
||
|
|
||
|
KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
|
||
|
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(name, opt->name) != 0)
|
||
|
continue;
|
||
|
opt->seen = 1;
|
||
|
if (opt->len == 0 || opt->value == NULL)
|
||
|
return (0);
|
||
|
if (((char *)opt->value)[opt->len - 1] != '\0')
|
||
|
return (0);
|
||
|
va_start(ap, fmt);
|
||
|
ret = vsscanf(opt->value, fmt, ap);
|
||
|
va_end(ap);
|
||
|
return (ret);
|
||
|
}
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
|
||
|
{
|
||
|
struct vfsopt *opt;
|
||
|
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(name, opt->name) != 0)
|
||
|
continue;
|
||
|
opt->seen = 1;
|
||
|
if (opt->value == NULL)
|
||
|
opt->len = len;
|
||
|
else {
|
||
|
if (opt->len != len)
|
||
|
return (EINVAL);
|
||
|
bcopy(value, opt->value, len);
|
||
|
}
|
||
|
return (0);
|
||
|
}
|
||
|
return (ENOENT);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
|
||
|
{
|
||
|
struct vfsopt *opt;
|
||
|
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(name, opt->name) != 0)
|
||
|
continue;
|
||
|
opt->seen = 1;
|
||
|
if (opt->value == NULL)
|
||
|
opt->len = len;
|
||
|
else {
|
||
|
if (opt->len < len)
|
||
|
return (EINVAL);
|
||
|
opt->len = len;
|
||
|
bcopy(value, opt->value, len);
|
||
|
}
|
||
|
return (0);
|
||
|
}
|
||
|
return (ENOENT);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
|
||
|
{
|
||
|
struct vfsopt *opt;
|
||
|
|
||
|
TAILQ_FOREACH(opt, opts, link) {
|
||
|
if (strcmp(name, opt->name) != 0)
|
||
|
continue;
|
||
|
opt->seen = 1;
|
||
|
if (opt->value == NULL)
|
||
|
opt->len = strlen(value) + 1;
|
||
|
else if (strlcpy(opt->value, value, opt->len) >= opt->len)
|
||
|
return (EINVAL);
|
||
|
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) {
|
||
|
opt->seen = 1;
|
||
|
if (len != opt->len)
|
||
|
return (EINVAL);
|
||
|
bcopy(opt->value, dest, opt->len);
|
||
|
return (0);
|
||
|
}
|
||
|
}
|
||
|
return (ENOENT);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
__vfs_statfs(struct mount *mp, struct statfs *sbp)
|
||
|
{
|
||
|
int error;
|
||
|
|
||
|
error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
|
||
|
if (sbp != &mp->mnt_stat)
|
||
|
*sbp = mp->mnt_stat;
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
vfs_mountedfrom(struct mount *mp, const char *from)
|
||
|
{
|
||
|
|
||
|
bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
|
||
|
strlcpy(mp->mnt_stat.f_mntfromname, from,
|
||
|
sizeof mp->mnt_stat.f_mntfromname);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* ---------------------------------------------------------------------
|
||
|
* This is the api for building mount args and mounting filesystems from
|
||
|
* inside the kernel.
|
||
|
*
|
||
|
* The API works by accumulation of individual args. First error is
|
||
|
* latched.
|
||
|
*
|
||
|
* XXX: should be documented in new manpage kernel_mount(9)
|
||
|
*/
|
||
|
|
||
|
/* A memory allocation which must be freed when we are done */
|
||
|
struct mntaarg {
|
||
|
SLIST_ENTRY(mntaarg) next;
|
||
|
};
|
||
|
|
||
|
/* The header for the mount arguments */
|
||
|
struct mntarg {
|
||
|
struct iovec *v;
|
||
|
int len;
|
||
|
int error;
|
||
|
SLIST_HEAD(, mntaarg) list;
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* Add a boolean argument.
|
||
|
*
|
||
|
* flag is the boolean value.
|
||
|
* name must start with "no".
|
||
|
*/
|
||
|
struct mntarg *
|
||
|
mount_argb(struct mntarg *ma, int flag, const char *name)
|
||
|
{
|
||
|
|
||
|
KASSERT(name[0] == 'n' && name[1] == 'o',
|
||
|
("mount_argb(...,%s): name must start with 'no'", name));
|
||
|
|
||
|
return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Add an argument printf style
|
||
|
*/
|
||
|
struct mntarg *
|
||
|
mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
|
||
|
{
|
||
|
va_list ap;
|
||
|
struct mntaarg *maa;
|
||
|
struct sbuf *sb;
|
||
|
int len;
|
||
|
|
||
|
if (ma == NULL) {
|
||
|
ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
|
||
|
SLIST_INIT(&ma->list);
|
||
|
}
|
||
|
if (ma->error)
|
||
|
return (ma);
|
||
|
|
||
|
ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
|
||
|
M_MOUNT, M_WAITOK);
|
||
|
ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
|
||
|
ma->v[ma->len].iov_len = strlen(name) + 1;
|
||
|
ma->len++;
|
||
|
|
||
|
sb = sbuf_new_auto();
|
||
|
va_start(ap, fmt);
|
||
|
sbuf_vprintf(sb, fmt, ap);
|
||
|
va_end(ap);
|
||
|
sbuf_finish(sb);
|
||
|
len = sbuf_len(sb) + 1;
|
||
|
maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
|
||
|
SLIST_INSERT_HEAD(&ma->list, maa, next);
|
||
|
bcopy(sbuf_data(sb), maa + 1, len);
|
||
|
sbuf_delete(sb);
|
||
|
|
||
|
ma->v[ma->len].iov_base = maa + 1;
|
||
|
ma->v[ma->len].iov_len = len;
|
||
|
ma->len++;
|
||
|
|
||
|
return (ma);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Add an argument which is a userland string.
|
||
|
*/
|
||
|
struct mntarg *
|
||
|
mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
|
||
|
{
|
||
|
struct mntaarg *maa;
|
||
|
char *tbuf;
|
||
|
|
||
|
if (val == NULL)
|
||
|
return (ma);
|
||
|
if (ma == NULL) {
|
||
|
ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
|
||
|
SLIST_INIT(&ma->list);
|
||
|
}
|
||
|
if (ma->error)
|
||
|
return (ma);
|
||
|
maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
|
||
|
SLIST_INSERT_HEAD(&ma->list, maa, next);
|
||
|
tbuf = (void *)(maa + 1);
|
||
|
ma->error = copyinstr(val, tbuf, len, NULL);
|
||
|
return (mount_arg(ma, name, tbuf, -1));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Plain argument.
|
||
|
*
|
||
|
* If length is -1, treat value as a C string.
|
||
|
*/
|
||
|
struct mntarg *
|
||
|
mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
|
||
|
{
|
||
|
|
||
|
if (ma == NULL) {
|
||
|
ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
|
||
|
SLIST_INIT(&ma->list);
|
||
|
}
|
||
|
if (ma->error)
|
||
|
return (ma);
|
||
|
|
||
|
ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
|
||
|
M_MOUNT, M_WAITOK);
|
||
|
ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
|
||
|
ma->v[ma->len].iov_len = strlen(name) + 1;
|
||
|
ma->len++;
|
||
|
|
||
|
ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
|
||
|
if (len < 0)
|
||
|
ma->v[ma->len].iov_len = strlen(val) + 1;
|
||
|
else
|
||
|
ma->v[ma->len].iov_len = len;
|
||
|
ma->len++;
|
||
|
return (ma);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Free a mntarg structure
|
||
|
*/
|
||
|
static void
|
||
|
free_mntarg(struct mntarg *ma)
|
||
|
{
|
||
|
struct mntaarg *maa;
|
||
|
|
||
|
while (!SLIST_EMPTY(&ma->list)) {
|
||
|
maa = SLIST_FIRST(&ma->list);
|
||
|
SLIST_REMOVE_HEAD(&ma->list, next);
|
||
|
free(maa, M_MOUNT);
|
||
|
}
|
||
|
free(ma->v, M_MOUNT);
|
||
|
free(ma, M_MOUNT);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Mount a filesystem
|
||
|
*/
|
||
|
int
|
||
|
kernel_mount(struct mntarg *ma, uint64_t flags)
|
||
|
{
|
||
|
struct uio auio;
|
||
|
int error;
|
||
|
|
||
|
KASSERT(ma != NULL, ("kernel_mount NULL ma"));
|
||
|
KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
|
||
|
KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
|
||
|
|
||
|
auio.uio_iov = ma->v;
|
||
|
auio.uio_iovcnt = ma->len;
|
||
|
auio.uio_segflg = UIO_SYSSPACE;
|
||
|
|
||
|
error = ma->error;
|
||
|
if (!error)
|
||
|
error = vfs_donmount(curthread, flags, &auio);
|
||
|
free_mntarg(ma);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* A printflike function to mount a filesystem.
|
||
|
*/
|
||
|
int
|
||
|
kernel_vmount(int flags, ...)
|
||
|
{
|
||
|
struct mntarg *ma = NULL;
|
||
|
va_list ap;
|
||
|
const char *cp;
|
||
|
const void *vp;
|
||
|
int error;
|
||
|
|
||
|
va_start(ap, flags);
|
||
|
for (;;) {
|
||
|
cp = va_arg(ap, const char *);
|
||
|
if (cp == NULL)
|
||
|
break;
|
||
|
vp = va_arg(ap, const void *);
|
||
|
ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
|
||
|
}
|
||
|
va_end(ap);
|
||
|
|
||
|
error = kernel_mount(ma, flags);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
|
||
|
{
|
||
|
|
||
|
bcopy(oexp, exp, sizeof(*oexp));
|
||
|
exp->ex_numsecflavors = 0;
|
||
|
}
|