873fbcd776
- Remove also "MP SAFE" after prior "MPSAFE" pass. (suggested by bde) - Remove extra blank lines in some cases. - Add extra blank lines in some cases. - Remove no-op comments consisting solely of the function name, the word "syscall", or the system call name. - Add punctuation. - Re-wrap some comments.
2190 lines
51 KiB
C
2190 lines
51 KiB
C
/*-
|
|
* 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
|
|
* 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
|
|
* 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>
|
|
__FBSDID("$FreeBSD$");
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|
|
|
#include <sys/param.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/clock.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/kernel.h>
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|
#include <sys/libkern.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/syscallsubr.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/vnode.h>
|
|
#include <vm/uma.h>
|
|
|
|
#include <geom/geom.h>
|
|
|
|
#include <machine/stdarg.h>
|
|
|
|
#include <security/audit/audit.h>
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
#include "opt_rootdevname.h"
|
|
#include "opt_ddb.h"
|
|
#include "opt_mac.h"
|
|
|
|
#ifdef DDB
|
|
#include <ddb/ddb.h>
|
|
#endif
|
|
|
|
#define ROOTNAME "root_device"
|
|
#define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
|
|
|
|
static int vfs_domount(struct thread *td, const char *fstype,
|
|
char *fspath, int fsflags, void *fsdata);
|
|
static struct mount *vfs_mount_alloc(struct vnode *dvp, struct vfsconf *vfsp,
|
|
const char *fspath, struct thread *td);
|
|
static int vfs_mountroot_ask(void);
|
|
static int vfs_mountroot_try(const char *mountfrom);
|
|
static int vfs_donmount(struct thread *td, int fsflags,
|
|
struct uio *fsoptions);
|
|
static void free_mntarg(struct mntarg *ma);
|
|
static void vfs_mount_destroy(struct mount *);
|
|
static int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
|
|
|
|
static int usermount = 0;
|
|
SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0,
|
|
"Unprivileged users may mount and unmount file systems");
|
|
|
|
MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
|
|
MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker");
|
|
static uma_zone_t mount_zone;
|
|
|
|
/* List of mounted filesystems. */
|
|
struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
|
|
|
|
/* For any iteration/modification of mountlist */
|
|
struct mtx mountlist_mtx;
|
|
MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
|
|
|
|
TAILQ_HEAD(vfsoptlist, vfsopt);
|
|
struct vfsopt {
|
|
TAILQ_ENTRY(vfsopt) link;
|
|
char *name;
|
|
void *value;
|
|
int len;
|
|
};
|
|
|
|
/*
|
|
* The vnode of the system's root (/ in the filesystem, without chroot
|
|
* active.)
|
|
*/
|
|
struct vnode *rootvnode;
|
|
|
|
/*
|
|
* The root filesystem is detailed in the kernel environment variable
|
|
* vfs.root.mountfrom, which is expected to be in the general format
|
|
*
|
|
* <vfsname>:[<path>]
|
|
* 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
|
|
* to locate its physical store
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|
*/
|
|
|
|
/*
|
|
* Global opts, taken by all filesystems
|
|
*/
|
|
static const char *global_opts[] = {
|
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"errmsg",
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|
"fstype",
|
|
"fspath",
|
|
"rdonly",
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|
"ro",
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|
"rw",
|
|
"suid",
|
|
"exec",
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|
"update",
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|
NULL
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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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|
#ifndef ROOTDEVNAME
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|
# define ROOTDEVNAME NULL
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|
#endif
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|
static const char *ctrootdevname = ROOTDEVNAME;
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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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|
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|
TAILQ_REMOVE(opts, opt, link);
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|
free(opt->name, M_MOUNT);
|
|
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. */
|
|
static void
|
|
vfs_freeopts(struct vfsoptlist *opts)
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|
{
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|
struct vfsopt *opt;
|
|
|
|
while (!TAILQ_EMPTY(opts)) {
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|
opt = TAILQ_FIRST(opts);
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|
vfs_freeopt(opts, opt);
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|
}
|
|
free(opts, M_MOUNT);
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|
}
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|
|
|
void
|
|
vfs_deleteopt(struct vfsoptlist *opts, const char *name)
|
|
{
|
|
struct vfsopt *opt, *temp;
|
|
|
|
TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
|
|
if (strcmp(opt->name, name) == 0)
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|
vfs_freeopt(opts, opt);
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|
}
|
|
}
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|
|
|
/*
|
|
* Check if options are equal (with or without the "no" prefix).
|
|
*/
|
|
static int
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|
vfs_equalopts(const char *opt1, const char *opt2)
|
|
{
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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);
|
|
/* "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" */
|
|
if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 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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|
* 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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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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|
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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size_t memused;
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|
unsigned int i, iovcnt;
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|
int error, namelen, optlen;
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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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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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|
opt->len = 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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memused += sizeof(struct vfsopt) + optlen + namelen;
|
|
|
|
/*
|
|
* Avoid consuming too much memory, and attempts to overflow
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|
* memused.
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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;
|
|
goto bad;
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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);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
/* Ensure names are null-terminated strings. */
|
|
if (opt->name[namelen - 1] != '\0') {
|
|
error = EINVAL;
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|
goto bad;
|
|
}
|
|
if (optlen != 0) {
|
|
opt->len = optlen;
|
|
opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
|
|
if (auio->uio_segflg == UIO_SYSSPACE) {
|
|
bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
|
|
optlen);
|
|
} else {
|
|
error = copyin(auio->uio_iov[i + 1].iov_base,
|
|
opt->value, optlen);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
}
|
|
}
|
|
vfs_sanitizeopts(opts);
|
|
*options = opts;
|
|
return (0);
|
|
bad:
|
|
vfs_freeopts(opts);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Merge the old mount options with the new ones passed
|
|
* in the MNT_UPDATE case.
|
|
*/
|
|
static void
|
|
vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts)
|
|
{
|
|
struct vfsopt *opt, *opt2, *new;
|
|
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
/*
|
|
* Check that this option hasn't been redefined
|
|
* nor cancelled with a "no" mount option.
|
|
*/
|
|
opt2 = TAILQ_FIRST(toopts);
|
|
while (opt2 != NULL) {
|
|
if (strcmp(opt2->name, opt->name) == 0)
|
|
goto next;
|
|
if (strncmp(opt2->name, "no", 2) == 0 &&
|
|
strcmp(opt2->name + 2, opt->name) == 0) {
|
|
vfs_freeopt(toopts, opt2);
|
|
goto next;
|
|
}
|
|
opt2 = TAILQ_NEXT(opt2, link);
|
|
}
|
|
/* We want this option, duplicate it. */
|
|
new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
|
|
new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK);
|
|
strcpy(new->name, opt->name);
|
|
if (opt->len != 0) {
|
|
new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
|
|
bcopy(opt->value, new->value, opt->len);
|
|
} else {
|
|
new->value = NULL;
|
|
}
|
|
new->len = opt->len;
|
|
TAILQ_INSERT_TAIL(toopts, new, link);
|
|
next:
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Mount a filesystem.
|
|
*/
|
|
int
|
|
nmount(td, uap)
|
|
struct thread *td;
|
|
struct nmount_args /* {
|
|
struct iovec *iovp;
|
|
unsigned int iovcnt;
|
|
int flags;
|
|
} */ *uap;
|
|
{
|
|
struct uio *auio;
|
|
struct iovec *iov;
|
|
unsigned int i;
|
|
int error;
|
|
u_int iovcnt;
|
|
|
|
AUDIT_ARG(fflags, uap->flags);
|
|
|
|
/* Kick out MNT_ROOTFS early as it is legal internally */
|
|
if (uap->flags & MNT_ROOTFS)
|
|
return (EINVAL);
|
|
|
|
iovcnt = uap->iovcnt;
|
|
/*
|
|
* 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);
|
|
|
|
error = copyinuio(uap->iovp, iovcnt, &auio);
|
|
if (error)
|
|
return (error);
|
|
iov = auio->uio_iov;
|
|
for (i = 0; i < iovcnt; i++) {
|
|
if (iov->iov_len > MMAXOPTIONLEN) {
|
|
free(auio, M_IOV);
|
|
return (EINVAL);
|
|
}
|
|
iov++;
|
|
}
|
|
error = vfs_donmount(td, uap->flags, auio);
|
|
|
|
free(auio, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------------
|
|
* Various utility functions
|
|
*/
|
|
|
|
void
|
|
vfs_ref(struct mount *mp)
|
|
{
|
|
|
|
MNT_ILOCK(mp);
|
|
MNT_REF(mp);
|
|
MNT_IUNLOCK(mp);
|
|
}
|
|
|
|
void
|
|
vfs_rel(struct mount *mp)
|
|
{
|
|
|
|
MNT_ILOCK(mp);
|
|
MNT_REL(mp);
|
|
MNT_IUNLOCK(mp);
|
|
}
|
|
|
|
static int
|
|
mount_init(void *mem, int size, int flags)
|
|
{
|
|
struct mount *mp;
|
|
|
|
mp = (struct mount *)mem;
|
|
mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
|
|
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mount_fini(void *mem, int size)
|
|
{
|
|
struct mount *mp;
|
|
|
|
mp = (struct mount *)mem;
|
|
lockdestroy(&mp->mnt_lock);
|
|
mtx_destroy(&mp->mnt_mtx);
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize the mount point struct.
|
|
*/
|
|
static struct mount *
|
|
vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp,
|
|
const char *fspath, struct thread *td)
|
|
{
|
|
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;
|
|
mp->mnt_ref = 0;
|
|
(void) vfs_busy(mp, LK_NOWAIT, 0, td);
|
|
mp->mnt_op = vfsp->vfc_vfsops;
|
|
mp->mnt_vfc = vfsp;
|
|
vfsp->vfc_refcount++; /* XXX Unlocked */
|
|
mp->mnt_stat.f_type = vfsp->vfc_typenum;
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
|
|
MNT_IUNLOCK(mp);
|
|
mp->mnt_gen++;
|
|
strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, 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
|
|
arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
|
|
return (mp);
|
|
}
|
|
|
|
/*
|
|
* Destroy the mount struct previously allocated by vfs_mount_alloc().
|
|
*/
|
|
static void
|
|
vfs_mount_destroy(struct mount *mp)
|
|
{
|
|
int i;
|
|
|
|
MNT_ILOCK(mp);
|
|
for (i = 0; mp->mnt_ref && i < 3; i++)
|
|
msleep(mp, MNT_MTX(mp), PVFS, "mntref", hz);
|
|
/*
|
|
* This will always cause a 3 second delay in rebooting due to
|
|
* refs on the root mountpoint that never go away. Most of these
|
|
* are held by init which never exits.
|
|
*/
|
|
if (i == 3 && (!rebooting || bootverbose))
|
|
printf("Mount point %s had %d dangling refs\n",
|
|
mp->mnt_stat.f_mntonname, mp->mnt_ref);
|
|
if (mp->mnt_holdcnt != 0) {
|
|
printf("Waiting for mount point to be unheld\n");
|
|
while (mp->mnt_holdcnt != 0) {
|
|
mp->mnt_holdcntwaiters++;
|
|
msleep(&mp->mnt_holdcnt, MNT_MTX(mp),
|
|
PZERO, "mntdestroy", 0);
|
|
mp->mnt_holdcntwaiters--;
|
|
}
|
|
printf("mount point unheld\n");
|
|
}
|
|
if (mp->mnt_writeopcount > 0) {
|
|
printf("Waiting for mount point write ops\n");
|
|
while (mp->mnt_writeopcount > 0) {
|
|
mp->mnt_kern_flag |= MNTK_SUSPEND;
|
|
msleep(&mp->mnt_writeopcount,
|
|
MNT_MTX(mp),
|
|
PZERO, "mntdestroy2", 0);
|
|
}
|
|
printf("mount point write ops completed\n");
|
|
}
|
|
if (mp->mnt_secondary_writes > 0) {
|
|
printf("Waiting for mount point secondary write ops\n");
|
|
while (mp->mnt_secondary_writes > 0) {
|
|
mp->mnt_kern_flag |= MNTK_SUSPEND;
|
|
msleep(&mp->mnt_secondary_writes,
|
|
MNT_MTX(mp),
|
|
PZERO, "mntdestroy3", 0);
|
|
}
|
|
printf("mount point secondary write ops completed\n");
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
mp->mnt_vfc->vfc_refcount--;
|
|
if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
|
|
struct vnode *vp;
|
|
|
|
TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
|
|
vprint("", vp);
|
|
panic("unmount: dangling vnode");
|
|
}
|
|
MNT_ILOCK(mp);
|
|
if (mp->mnt_kern_flag & MNTK_MWAIT)
|
|
wakeup(mp);
|
|
if (mp->mnt_writeopcount != 0)
|
|
panic("vfs_mount_destroy: nonzero writeopcount");
|
|
if (mp->mnt_secondary_writes != 0)
|
|
panic("vfs_mount_destroy: nonzero secondary_writes");
|
|
if (mp->mnt_nvnodelistsize != 0)
|
|
panic("vfs_mount_destroy: nonzero nvnodelistsize");
|
|
mp->mnt_writeopcount = -1000;
|
|
mp->mnt_nvnodelistsize = -1000;
|
|
mp->mnt_secondary_writes = -1000;
|
|
MNT_IUNLOCK(mp);
|
|
#ifdef MAC
|
|
mac_destroy_mount(mp);
|
|
#endif
|
|
if (mp->mnt_opt != NULL)
|
|
vfs_freeopts(mp->mnt_opt);
|
|
crfree(mp->mnt_cred);
|
|
uma_zfree(mount_zone, mp);
|
|
}
|
|
|
|
static int
|
|
vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions)
|
|
{
|
|
struct vfsoptlist *optlist;
|
|
struct vfsopt *opt, *noro_opt;
|
|
char *fstype, *fspath, *errmsg;
|
|
int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
|
|
int has_rw, has_noro;
|
|
|
|
errmsg = NULL;
|
|
errmsg_len = 0;
|
|
errmsg_pos = -1;
|
|
has_rw = 0;
|
|
has_noro = 0;
|
|
|
|
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(opt, optlist, link) {
|
|
if (strcmp(opt->name, "update") == 0)
|
|
fsflags |= MNT_UPDATE;
|
|
else if (strcmp(opt->name, "async") == 0)
|
|
fsflags |= MNT_ASYNC;
|
|
else if (strcmp(opt->name, "force") == 0)
|
|
fsflags |= MNT_FORCE;
|
|
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, "noclusterr") == 0)
|
|
fsflags |= MNT_NOCLUSTERR;
|
|
else if (strcmp(opt->name, "noclusterw") == 0)
|
|
fsflags |= MNT_NOCLUSTERW;
|
|
else if (strcmp(opt->name, "noexec") == 0)
|
|
fsflags |= MNT_NOEXEC;
|
|
else if (strcmp(opt->name, "nosuid") == 0)
|
|
fsflags |= MNT_NOSUID;
|
|
else if (strcmp(opt->name, "nosymfollow") == 0)
|
|
fsflags |= MNT_NOSYMFOLLOW;
|
|
else if (strcmp(opt->name, "noro") == 0) {
|
|
fsflags &= ~MNT_RDONLY;
|
|
has_noro = 1;
|
|
}
|
|
else if (strcmp(opt->name, "rw") == 0) {
|
|
fsflags &= ~MNT_RDONLY;
|
|
has_rw = 1;
|
|
}
|
|
else if (strcmp(opt->name, "ro") == 0 ||
|
|
strcmp(opt->name, "rdonly") == 0)
|
|
fsflags |= MNT_RDONLY;
|
|
else if (strcmp(opt->name, "snapshot") == 0)
|
|
fsflags |= MNT_SNAPSHOT;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* If "rw" was specified as a mount option, and we
|
|
* are trying to update a mount-point from "ro" to "rw",
|
|
* we need a mount option "noro", since in vfs_mergeopts(),
|
|
* "noro" will cancel "ro", but "rw" will not do anything.
|
|
*/
|
|
if (has_rw && !has_noro) {
|
|
noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
|
|
noro_opt->name = strdup("noro", M_MOUNT);
|
|
noro_opt->value = NULL;
|
|
noro_opt->len = 0;
|
|
TAILQ_INSERT_TAIL(optlist, noro_opt, link);
|
|
}
|
|
|
|
/*
|
|
* 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 bail;
|
|
}
|
|
|
|
mtx_lock(&Giant);
|
|
error = vfs_domount(td, fstype, fspath, fsflags, optlist);
|
|
mtx_unlock(&Giant);
|
|
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 (error != 0)
|
|
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;
|
|
struct vfsconf *vfsp = NULL;
|
|
struct mntarg *ma = NULL;
|
|
int error;
|
|
|
|
AUDIT_ARG(fflags, uap->flags);
|
|
|
|
/* Kick out MNT_ROOTFS early as it is legal internally */
|
|
uap->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);
|
|
mtx_lock(&Giant);
|
|
vfsp = vfs_byname_kld(fstype, td, &error);
|
|
free(fstype, M_TEMP);
|
|
if (vfsp == NULL) {
|
|
mtx_unlock(&Giant);
|
|
return (ENOENT);
|
|
}
|
|
if (vfsp->vfc_vfsops->vfs_cmount == NULL) {
|
|
mtx_unlock(&Giant);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN);
|
|
ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
|
|
ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro");
|
|
ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid");
|
|
ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec");
|
|
|
|
error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags, td);
|
|
mtx_unlock(&Giant);
|
|
return (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. */
|
|
int fsflags, /* Flags common to all filesystems. */
|
|
void *fsdata /* Options local to the filesystem. */
|
|
)
|
|
{
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
struct vfsconf *vfsp;
|
|
struct export_args export;
|
|
int error, flag = 0;
|
|
struct vattr va;
|
|
struct nameidata nd;
|
|
|
|
mtx_assert(&Giant, MA_OWNED);
|
|
/*
|
|
* 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))
|
|
return (EPERM);
|
|
if (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);
|
|
}
|
|
/*
|
|
* Get vnode to be covered
|
|
*/
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 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;
|
|
MNT_ILOCK(mp);
|
|
flag = mp->mnt_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)) {
|
|
MNT_IUNLOCK(mp);
|
|
vput(vp);
|
|
return (EOPNOTSUPP); /* Needs translation */
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
/*
|
|
* 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) {
|
|
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);
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_flag |= fsflags &
|
|
(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS);
|
|
MNT_IUNLOCK(mp);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
mp->mnt_optnew = fsdata;
|
|
vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
|
|
} else {
|
|
/*
|
|
* 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 = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN,
|
|
SUSER_ALLOWJAIL);
|
|
if (error) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
}
|
|
error = vinvalbuf(vp, V_SAVE, td, 0, 0);
|
|
if (error != 0) {
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
if (vp->v_type != VDIR) {
|
|
vput(vp);
|
|
return (ENOTDIR);
|
|
}
|
|
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 = vfs_mount_alloc(vp, vfsp, fspath, td);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
|
|
/* XXXMAC: pass to vfs_mount_alloc? */
|
|
mp->mnt_optnew = fsdata;
|
|
}
|
|
|
|
/*
|
|
* Set the mount level flags.
|
|
*/
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) |
|
|
(fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS |
|
|
MNT_RDONLY));
|
|
if ((mp->mnt_flag & MNT_ASYNC) == 0)
|
|
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
|
MNT_IUNLOCK(mp);
|
|
/*
|
|
* 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, td);
|
|
|
|
/*
|
|
* Process the export option only if we are
|
|
* updating mount options.
|
|
*/
|
|
if (!error && (fsflags & MNT_UPDATE)) {
|
|
if (vfs_copyopt(mp->mnt_optnew, "export", &export,
|
|
sizeof(export)) == 0)
|
|
error = vfs_export(mp, &export);
|
|
}
|
|
|
|
if (!error) {
|
|
if (mp->mnt_opt != NULL)
|
|
vfs_freeopts(mp->mnt_opt);
|
|
mp->mnt_opt = mp->mnt_optnew;
|
|
(void)VFS_STATFS(mp, &mp->mnt_stat, td);
|
|
}
|
|
/*
|
|
* Prevent external consumers of mount options from reading
|
|
* mnt_optnew.
|
|
*/
|
|
mp->mnt_optnew = NULL;
|
|
if (mp->mnt_flag & MNT_UPDATE) {
|
|
MNT_ILOCK(mp);
|
|
if (error)
|
|
mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) |
|
|
(flag & ~MNT_QUOTA);
|
|
else
|
|
mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD |
|
|
MNT_FORCE | MNT_SNAPSHOT);
|
|
if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
|
|
mp->mnt_kern_flag |= MNTK_ASYNC;
|
|
else
|
|
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
|
MNT_IUNLOCK(mp);
|
|
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);
|
|
}
|
|
MNT_ILOCK(mp);
|
|
if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_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, 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);
|
|
vfs_event_signal(NULL, VQ_MOUNT, 0);
|
|
if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td))
|
|
panic("mount: lost mount");
|
|
mountcheckdirs(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)
|
|
vrele(vp);
|
|
} else {
|
|
VI_LOCK(vp);
|
|
vp->v_iflag &= ~VI_MOUNT;
|
|
VI_UNLOCK(vp);
|
|
vfs_unbusy(mp, td);
|
|
vfs_mount_destroy(mp);
|
|
vput(vp);
|
|
}
|
|
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
|
|
unmount(td, uap)
|
|
struct thread *td;
|
|
register struct unmount_args /* {
|
|
char *path;
|
|
int flags;
|
|
} */ *uap;
|
|
{
|
|
struct mount *mp;
|
|
char *pathbuf;
|
|
int error, id0, id1;
|
|
|
|
if (jailed(td->td_ucred))
|
|
return (EPERM);
|
|
if (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);
|
|
}
|
|
AUDIT_ARG(upath, td, pathbuf, ARG_UPATH1);
|
|
mtx_lock(&Giant);
|
|
if (uap->flags & MNT_BYFSID) {
|
|
/* Decode the filesystem ID. */
|
|
if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
|
|
mtx_unlock(&Giant);
|
|
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.
|
|
*/
|
|
mtx_unlock(&Giant);
|
|
return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow unmounting the root filesystem.
|
|
*/
|
|
if (mp->mnt_flag & MNT_ROOTFS) {
|
|
mtx_unlock(&Giant);
|
|
return (EINVAL);
|
|
}
|
|
error = dounmount(mp, uap->flags, td);
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int mnt_gen_r;
|
|
|
|
mtx_assert(&Giant, MA_OWNED);
|
|
|
|
if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
|
|
mnt_gen_r = mp->mnt_gen;
|
|
VI_LOCK(coveredvp);
|
|
vholdl(coveredvp);
|
|
error = vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK, td);
|
|
vdrop(coveredvp);
|
|
/*
|
|
* Check for mp being unmounted while waiting for the
|
|
* covered vnode lock.
|
|
*/
|
|
if (error)
|
|
return (error);
|
|
if (coveredvp->v_mountedhere != mp ||
|
|
coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
|
|
VOP_UNLOCK(coveredvp, 0, td);
|
|
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) {
|
|
if (coveredvp)
|
|
VOP_UNLOCK(coveredvp, 0, td);
|
|
return (error);
|
|
}
|
|
|
|
MNT_ILOCK(mp);
|
|
if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
|
|
MNT_IUNLOCK(mp);
|
|
if (coveredvp)
|
|
VOP_UNLOCK(coveredvp, 0, td);
|
|
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), MNT_MTX(mp), td);
|
|
if (error) {
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
|
|
if (mp->mnt_kern_flag & MNTK_MWAIT)
|
|
wakeup(mp);
|
|
MNT_IUNLOCK(mp);
|
|
if (coveredvp)
|
|
VOP_UNLOCK(coveredvp, 0, td);
|
|
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);
|
|
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 */
|
|
if (mp->mnt_syncer != NULL)
|
|
vrele(mp->mnt_syncer);
|
|
/*
|
|
* 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, td) == 0) {
|
|
if (mp->mnt_vnodecovered != NULL)
|
|
mountcheckdirs(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)) == 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 ((flags & MNT_FORCE) &&
|
|
VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) {
|
|
if (mp->mnt_vnodecovered != NULL)
|
|
mountcheckdirs(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);
|
|
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_noasync == 0)
|
|
mp->mnt_kern_flag |= MNTK_ASYNC;
|
|
lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td);
|
|
if (mp->mnt_kern_flag & MNTK_MWAIT)
|
|
wakeup(mp);
|
|
MNT_IUNLOCK(mp);
|
|
if (coveredvp)
|
|
VOP_UNLOCK(coveredvp, 0, td);
|
|
return (error);
|
|
}
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_REMOVE(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
if (coveredvp != NULL) {
|
|
coveredvp->v_mountedhere = NULL;
|
|
vput(coveredvp);
|
|
}
|
|
vfs_event_signal(NULL, VQ_UNMOUNT, 0);
|
|
lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td);
|
|
vfs_mount_destroy(mp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------------
|
|
* Mounting of root filesystem
|
|
*
|
|
*/
|
|
|
|
struct root_hold_token {
|
|
const char *who;
|
|
LIST_ENTRY(root_hold_token) list;
|
|
};
|
|
|
|
static LIST_HEAD(, root_hold_token) root_holds =
|
|
LIST_HEAD_INITIALIZER(&root_holds);
|
|
|
|
struct root_hold_token *
|
|
root_mount_hold(const char *identifier)
|
|
{
|
|
struct root_hold_token *h;
|
|
|
|
h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
|
|
h->who = identifier;
|
|
mtx_lock(&mountlist_mtx);
|
|
LIST_INSERT_HEAD(&root_holds, h, list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
return (h);
|
|
}
|
|
|
|
void
|
|
root_mount_rel(struct root_hold_token *h)
|
|
{
|
|
|
|
mtx_lock(&mountlist_mtx);
|
|
LIST_REMOVE(h, list);
|
|
wakeup(&root_holds);
|
|
mtx_unlock(&mountlist_mtx);
|
|
free(h, M_DEVBUF);
|
|
}
|
|
|
|
static void
|
|
root_mount_wait(void)
|
|
{
|
|
struct root_hold_token *h;
|
|
|
|
for (;;) {
|
|
DROP_GIANT();
|
|
g_waitidle();
|
|
PICKUP_GIANT();
|
|
mtx_lock(&mountlist_mtx);
|
|
if (LIST_EMPTY(&root_holds)) {
|
|
mtx_unlock(&mountlist_mtx);
|
|
break;
|
|
}
|
|
printf("Root mount waiting for:");
|
|
LIST_FOREACH(h, &root_holds, list)
|
|
printf(" %s", h->who);
|
|
printf("\n");
|
|
msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold",
|
|
hz);
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_rootvnode(struct thread *td)
|
|
{
|
|
struct proc *p;
|
|
|
|
if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td))
|
|
panic("Cannot find root vnode");
|
|
|
|
p = td->td_proc;
|
|
FILEDESC_LOCK(p->p_fd);
|
|
|
|
if (p->p_fd->fd_cdir != NULL)
|
|
vrele(p->p_fd->fd_cdir);
|
|
p->p_fd->fd_cdir = rootvnode;
|
|
VREF(rootvnode);
|
|
|
|
if (p->p_fd->fd_rdir != NULL)
|
|
vrele(p->p_fd->fd_rdir);
|
|
p->p_fd->fd_rdir = rootvnode;
|
|
VREF(rootvnode);
|
|
|
|
FILEDESC_UNLOCK(p->p_fd);
|
|
|
|
VOP_UNLOCK(rootvnode, 0, td);
|
|
}
|
|
|
|
/*
|
|
* Mount /devfs as our root filesystem, but do not put it on the mountlist
|
|
* yet. Create a /dev -> / symlink so that absolute pathnames will lookup.
|
|
*/
|
|
|
|
static void
|
|
devfs_first(void)
|
|
{
|
|
struct thread *td = curthread;
|
|
struct vfsoptlist *opts;
|
|
struct vfsconf *vfsp;
|
|
struct mount *mp = NULL;
|
|
int error;
|
|
|
|
vfsp = vfs_byname("devfs");
|
|
KASSERT(vfsp != NULL, ("Could not find devfs by name"));
|
|
if (vfsp == NULL)
|
|
return;
|
|
|
|
mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td);
|
|
|
|
error = VFS_MOUNT(mp, td);
|
|
KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
|
|
if (error)
|
|
return;
|
|
|
|
opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
|
|
TAILQ_INIT(opts);
|
|
mp->mnt_opt = opts;
|
|
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
|
|
set_rootvnode(td);
|
|
|
|
error = kern_symlink(td, "/", "dev", UIO_SYSSPACE);
|
|
if (error)
|
|
printf("kern_symlink /dev -> / returns %d\n", error);
|
|
}
|
|
|
|
/*
|
|
* Surgically move our devfs to be mounted on /dev.
|
|
*/
|
|
|
|
static void
|
|
devfs_fixup(struct thread *td)
|
|
{
|
|
struct nameidata nd;
|
|
int error;
|
|
struct vnode *vp, *dvp;
|
|
struct mount *mp;
|
|
|
|
/* Remove our devfs mount from the mountlist and purge the cache */
|
|
mtx_lock(&mountlist_mtx);
|
|
mp = TAILQ_FIRST(&mountlist);
|
|
TAILQ_REMOVE(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
cache_purgevfs(mp);
|
|
|
|
VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td);
|
|
VI_LOCK(dvp);
|
|
dvp->v_iflag &= ~VI_MOUNT;
|
|
dvp->v_mountedhere = NULL;
|
|
VI_UNLOCK(dvp);
|
|
|
|
/* Set up the real rootvnode, and purge the cache */
|
|
TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL;
|
|
set_rootvnode(td);
|
|
cache_purgevfs(rootvnode->v_mount);
|
|
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td);
|
|
error = namei(&nd);
|
|
if (error) {
|
|
printf("Lookup of /dev for devfs, error: %d\n", error);
|
|
return;
|
|
}
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
vp = nd.ni_vp;
|
|
if (vp->v_type != VDIR) {
|
|
vput(vp);
|
|
}
|
|
error = vinvalbuf(vp, V_SAVE, td, 0, 0);
|
|
if (error) {
|
|
vput(vp);
|
|
}
|
|
cache_purge(vp);
|
|
mp->mnt_vnodecovered = vp;
|
|
vp->v_mountedhere = mp;
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vput(dvp);
|
|
vfs_unbusy(mp, td);
|
|
|
|
/* Unlink the no longer needed /dev/dev -> / symlink */
|
|
kern_unlink(td, "/dev/dev", UIO_SYSSPACE);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* Find and mount the root filesystem
|
|
*/
|
|
void
|
|
vfs_mountroot(void)
|
|
{
|
|
char *cp;
|
|
int error, i, asked = 0;
|
|
|
|
root_mount_wait();
|
|
|
|
mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount),
|
|
NULL, NULL, mount_init, mount_fini,
|
|
UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
|
|
devfs_first();
|
|
|
|
/*
|
|
* We are booted with instructions to prompt for the root filesystem.
|
|
*/
|
|
if (boothowto & RB_ASKNAME) {
|
|
if (!vfs_mountroot_ask())
|
|
return;
|
|
asked = 1;
|
|
}
|
|
|
|
/*
|
|
* The root filesystem information is compiled in, and we are
|
|
* booted with instructions to use it.
|
|
*/
|
|
if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) {
|
|
if (!vfs_mountroot_try(ctrootdevname))
|
|
return;
|
|
ctrootdevname = NULL;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
cp = getenv("vfs.root.mountfrom");
|
|
if (cp != NULL) {
|
|
error = vfs_mountroot_try(cp);
|
|
freeenv(cp);
|
|
if (!error)
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Try values that may have been computed by code during boot
|
|
*/
|
|
if (!vfs_mountroot_try(rootdevnames[0]))
|
|
return;
|
|
if (!vfs_mountroot_try(rootdevnames[1]))
|
|
return;
|
|
|
|
/*
|
|
* If we (still) have a compiled-in default, try it.
|
|
*/
|
|
if (ctrootdevname != NULL)
|
|
if (!vfs_mountroot_try(ctrootdevname))
|
|
return;
|
|
/*
|
|
* Everything so far has failed, prompt on the console if we haven't
|
|
* already tried that.
|
|
*/
|
|
if (!asked)
|
|
if (!vfs_mountroot_ask())
|
|
return;
|
|
|
|
panic("Root mount failed, startup aborted.");
|
|
}
|
|
|
|
/*
|
|
* Mount (mountfrom) as the root filesystem.
|
|
*/
|
|
static int
|
|
vfs_mountroot_try(const char *mountfrom)
|
|
{
|
|
struct mount *mp;
|
|
char *vfsname, *path;
|
|
time_t timebase;
|
|
int error;
|
|
char patt[32];
|
|
|
|
vfsname = NULL;
|
|
path = NULL;
|
|
mp = NULL;
|
|
error = EINVAL;
|
|
|
|
if (mountfrom == NULL)
|
|
return (error); /* don't complain */
|
|
printf("Trying to mount root from %s\n", mountfrom);
|
|
|
|
/* 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]:%%%ds", MFSNAMELEN, MNAMELEN);
|
|
if (sscanf(mountfrom, patt, vfsname, path) < 1)
|
|
goto out;
|
|
|
|
if (path[0] == '\0')
|
|
strcpy(path, ROOTNAME);
|
|
|
|
error = kernel_vmount(
|
|
MNT_RDONLY | MNT_ROOTFS,
|
|
"fstype", vfsname,
|
|
"fspath", "/",
|
|
"from", path,
|
|
NULL);
|
|
if (error == 0) {
|
|
/*
|
|
* We mount devfs prior to mounting the / FS, so the first
|
|
* entry will typically be devfs.
|
|
*/
|
|
mp = TAILQ_FIRST(&mountlist);
|
|
KASSERT(mp != NULL, ("%s: mountlist is empty", __func__));
|
|
|
|
/*
|
|
* Iterate over all currently mounted file systems and use
|
|
* the time stamp found to check and/or initialize the RTC.
|
|
* Typically devfs has no time stamp and the only other FS
|
|
* is the actual / FS.
|
|
* Call inittodr() only once and pass it the largest of the
|
|
* timestamps we encounter.
|
|
*/
|
|
timebase = 0;
|
|
do {
|
|
if (mp->mnt_time > timebase)
|
|
timebase = mp->mnt_time;
|
|
mp = TAILQ_NEXT(mp, mnt_list);
|
|
} while (mp != NULL);
|
|
inittodr(timebase);
|
|
|
|
devfs_fixup(curthread);
|
|
}
|
|
out:
|
|
free(path, M_MOUNT);
|
|
free(vfsname, M_MOUNT);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------------
|
|
* Interactive root filesystem selection code.
|
|
*/
|
|
|
|
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(__amd64__) || 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, sizeof(name), 1);
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------------
|
|
* 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;
|
|
const char **t, *p;
|
|
|
|
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
p = opt->name;
|
|
if (p[0] == 'n' && p[1] == 'o')
|
|
p += 2;
|
|
for(t = global_opts; *t != NULL; t++)
|
|
if (!strcmp(*t, p))
|
|
break;
|
|
if (*t != NULL)
|
|
continue;
|
|
for(t = legal; *t != NULL; t++)
|
|
if (!strcmp(*t, p))
|
|
break;
|
|
if (*t != NULL)
|
|
continue;
|
|
printf("mount option <%s> is unknown\n", p);
|
|
return (EINVAL);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
static int
|
|
vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
|
|
{
|
|
struct vfsopt *opt;
|
|
int i;
|
|
|
|
if (opts == NULL)
|
|
return (-1);
|
|
|
|
i = 0;
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
if (strcmp(name, opt->name) == 0)
|
|
return (i);
|
|
++i;
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
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;
|
|
if (((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, u_int *w, u_int val)
|
|
{
|
|
struct vfsopt *opt;
|
|
|
|
TAILQ_FOREACH(opt, opts, link) {
|
|
if (strcmp(name, opt->name) == 0) {
|
|
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;
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* This is a helper function for filesystems to traverse their
|
|
* vnodes. See MNT_VNODE_FOREACH() in sys/mount.h
|
|
*/
|
|
|
|
struct vnode *
|
|
__mnt_vnode_next(struct vnode **mvp, struct mount *mp)
|
|
{
|
|
struct vnode *vp;
|
|
|
|
mtx_assert(MNT_MTX(mp), MA_OWNED);
|
|
|
|
KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
|
|
vp = TAILQ_NEXT(*mvp, v_nmntvnodes);
|
|
while (vp != NULL && vp->v_type == VMARKER)
|
|
vp = TAILQ_NEXT(vp, v_nmntvnodes);
|
|
|
|
/* Check if we are done */
|
|
if (vp == NULL) {
|
|
__mnt_vnode_markerfree(mvp, mp);
|
|
return (NULL);
|
|
}
|
|
TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
|
|
TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
|
|
return (vp);
|
|
}
|
|
|
|
struct vnode *
|
|
__mnt_vnode_first(struct vnode **mvp, struct mount *mp)
|
|
{
|
|
struct vnode *vp;
|
|
|
|
mtx_assert(MNT_MTX(mp), MA_OWNED);
|
|
|
|
vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
|
|
while (vp != NULL && vp->v_type == VMARKER)
|
|
vp = TAILQ_NEXT(vp, v_nmntvnodes);
|
|
|
|
/* Check if we are done */
|
|
if (vp == NULL) {
|
|
*mvp = NULL;
|
|
return (NULL);
|
|
}
|
|
mp->mnt_holdcnt++;
|
|
MNT_IUNLOCK(mp);
|
|
*mvp = (struct vnode *) malloc(sizeof(struct vnode),
|
|
M_VNODE_MARKER,
|
|
M_WAITOK | M_ZERO);
|
|
MNT_ILOCK(mp);
|
|
(*mvp)->v_type = VMARKER;
|
|
|
|
vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
|
|
while (vp != NULL && vp->v_type == VMARKER)
|
|
vp = TAILQ_NEXT(vp, v_nmntvnodes);
|
|
|
|
/* Check if we are done */
|
|
if (vp == NULL) {
|
|
MNT_IUNLOCK(mp);
|
|
free(*mvp, M_VNODE_MARKER);
|
|
MNT_ILOCK(mp);
|
|
*mvp = NULL;
|
|
mp->mnt_holdcnt--;
|
|
if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0)
|
|
wakeup(&mp->mnt_holdcnt);
|
|
return (NULL);
|
|
}
|
|
mp->mnt_markercnt++;
|
|
(*mvp)->v_mount = mp;
|
|
TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes);
|
|
return (vp);
|
|
}
|
|
|
|
|
|
void
|
|
__mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp)
|
|
{
|
|
|
|
if (*mvp == NULL)
|
|
return;
|
|
|
|
mtx_assert(MNT_MTX(mp), MA_OWNED);
|
|
|
|
KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch"));
|
|
TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes);
|
|
MNT_IUNLOCK(mp);
|
|
free(*mvp, M_VNODE_MARKER);
|
|
MNT_ILOCK(mp);
|
|
*mvp = NULL;
|
|
|
|
mp->mnt_markercnt--;
|
|
mp->mnt_holdcnt--;
|
|
if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0)
|
|
wakeup(&mp->mnt_holdcnt);
|
|
}
|
|
|
|
|
|
int
|
|
__vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat, td);
|
|
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(NULL, NULL, 0, SBUF_AUTOEXTEND);
|
|
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, use printf.
|
|
*/
|
|
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, int 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, -1);
|
|
}
|
|
va_end(ap);
|
|
|
|
error = kernel_mount(ma, flags);
|
|
return (error);
|
|
}
|