1373 lines
32 KiB
C
1373 lines
32 KiB
C
/* $NetBSD: vfs_mount.c,v 1.9 2011/09/01 12:29:41 christos Exp $ */
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/*-
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* Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center, by Charles M. Hannum, and by Andrew Doran.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.9 2011/09/01 12:29:41 christos Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/atomic.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/filedesc.h>
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#include <sys/device.h>
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#include <sys/kauth.h>
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#include <sys/kmem.h>
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#include <sys/module.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/syscallargs.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/vfs_syscalls.h>
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#include <sys/vnode.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/syncfs/syncfs.h>
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#include <miscfs/specfs/specdev.h>
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/* Root filesystem and device. */
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vnode_t * rootvnode;
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struct device * root_device;
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/* Mounted filesystem list. */
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struct mntlist mountlist;
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kmutex_t mountlist_lock;
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kmutex_t mntvnode_lock;
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kmutex_t vfs_list_lock;
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static specificdata_domain_t mount_specificdata_domain;
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static kmutex_t mntid_lock;
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static kmutex_t mountgen_lock;
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static uint64_t mountgen;
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void
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vfs_mount_sysinit(void)
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{
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CIRCLEQ_INIT(&mountlist);
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mutex_init(&mountlist_lock, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&mntvnode_lock, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&vfs_list_lock, MUTEX_DEFAULT, IPL_NONE);
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mount_specificdata_domain = specificdata_domain_create();
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mutex_init(&mntid_lock, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&mountgen_lock, MUTEX_DEFAULT, IPL_NONE);
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mountgen = 0;
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}
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struct mount *
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vfs_mountalloc(struct vfsops *vfsops, vnode_t *vp)
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{
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struct mount *mp;
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int error;
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mp = kmem_zalloc(sizeof(*mp), KM_SLEEP);
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if (mp == NULL)
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return NULL;
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mp->mnt_op = vfsops;
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mp->mnt_refcnt = 1;
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TAILQ_INIT(&mp->mnt_vnodelist);
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rw_init(&mp->mnt_unmounting);
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mutex_init(&mp->mnt_renamelock, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&mp->mnt_updating, MUTEX_DEFAULT, IPL_NONE);
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error = vfs_busy(mp, NULL);
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KASSERT(error == 0);
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mp->mnt_vnodecovered = vp;
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mount_initspecific(mp);
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mutex_enter(&mountgen_lock);
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mp->mnt_gen = mountgen++;
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mutex_exit(&mountgen_lock);
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return mp;
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}
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/*
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* vfs_rootmountalloc: lookup a filesystem type, and if found allocate and
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* initialize a mount structure for it.
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*
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* Devname is usually updated by mount(8) after booting.
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*/
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int
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vfs_rootmountalloc(const char *fstypename, const char *devname,
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struct mount **mpp)
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{
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struct vfsops *vfsp = NULL;
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struct mount *mp;
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mutex_enter(&vfs_list_lock);
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LIST_FOREACH(vfsp, &vfs_list, vfs_list)
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if (!strncmp(vfsp->vfs_name, fstypename,
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sizeof(mp->mnt_stat.f_fstypename)))
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break;
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if (vfsp == NULL) {
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mutex_exit(&vfs_list_lock);
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return (ENODEV);
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}
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vfsp->vfs_refcount++;
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mutex_exit(&vfs_list_lock);
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if ((mp = vfs_mountalloc(vfsp, NULL)) == NULL)
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return ENOMEM;
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mp->mnt_flag = MNT_RDONLY;
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(void)strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfs_name,
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sizeof(mp->mnt_stat.f_fstypename));
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mp->mnt_stat.f_mntonname[0] = '/';
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mp->mnt_stat.f_mntonname[1] = '\0';
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mp->mnt_stat.f_mntfromname[sizeof(mp->mnt_stat.f_mntfromname) - 1] =
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'\0';
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(void)copystr(devname, mp->mnt_stat.f_mntfromname,
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sizeof(mp->mnt_stat.f_mntfromname) - 1, 0);
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*mpp = mp;
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return 0;
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}
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/*
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* vfs_getnewfsid: get a new unique fsid.
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*/
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void
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vfs_getnewfsid(struct mount *mp)
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{
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static u_short xxxfs_mntid;
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fsid_t tfsid;
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int mtype;
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mutex_enter(&mntid_lock);
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mtype = makefstype(mp->mnt_op->vfs_name);
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mp->mnt_stat.f_fsidx.__fsid_val[0] = makedev(mtype, 0);
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mp->mnt_stat.f_fsidx.__fsid_val[1] = mtype;
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mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
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if (xxxfs_mntid == 0)
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++xxxfs_mntid;
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tfsid.__fsid_val[0] = makedev(mtype & 0xff, xxxfs_mntid);
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tfsid.__fsid_val[1] = mtype;
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if (!CIRCLEQ_EMPTY(&mountlist)) {
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while (vfs_getvfs(&tfsid)) {
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tfsid.__fsid_val[0]++;
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xxxfs_mntid++;
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}
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}
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mp->mnt_stat.f_fsidx.__fsid_val[0] = tfsid.__fsid_val[0];
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mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
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mutex_exit(&mntid_lock);
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}
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/*
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* Lookup a mount point by filesystem identifier.
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*
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* XXX Needs to add a reference to the mount point.
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*/
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struct mount *
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vfs_getvfs(fsid_t *fsid)
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{
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struct mount *mp;
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mutex_enter(&mountlist_lock);
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CIRCLEQ_FOREACH(mp, &mountlist, mnt_list) {
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if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] &&
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mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) {
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mutex_exit(&mountlist_lock);
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return (mp);
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}
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}
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mutex_exit(&mountlist_lock);
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return NULL;
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}
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/*
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* Drop a reference to a mount structure, freeing if the last reference.
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*/
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void
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vfs_destroy(struct mount *mp)
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{
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if (__predict_true((int)atomic_dec_uint_nv(&mp->mnt_refcnt) > 0)) {
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return;
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}
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/*
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* Nothing else has visibility of the mount: we can now
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* free the data structures.
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*/
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KASSERT(mp->mnt_refcnt == 0);
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specificdata_fini(mount_specificdata_domain, &mp->mnt_specdataref);
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rw_destroy(&mp->mnt_unmounting);
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mutex_destroy(&mp->mnt_updating);
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mutex_destroy(&mp->mnt_renamelock);
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if (mp->mnt_op != NULL) {
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vfs_delref(mp->mnt_op);
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}
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kmem_free(mp, sizeof(*mp));
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}
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/*
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* Mark a mount point as busy, and gain a new reference to it. Used to
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* prevent the file system from being unmounted during critical sections.
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*
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* => The caller must hold a pre-existing reference to the mount.
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* => Will fail if the file system is being unmounted, or is unmounted.
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*/
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int
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vfs_busy(struct mount *mp, struct mount **nextp)
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{
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KASSERT(mp->mnt_refcnt > 0);
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if (__predict_false(!rw_tryenter(&mp->mnt_unmounting, RW_READER))) {
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if (nextp != NULL) {
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KASSERT(mutex_owned(&mountlist_lock));
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*nextp = CIRCLEQ_NEXT(mp, mnt_list);
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}
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return EBUSY;
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}
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if (__predict_false((mp->mnt_iflag & IMNT_GONE) != 0)) {
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rw_exit(&mp->mnt_unmounting);
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if (nextp != NULL) {
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KASSERT(mutex_owned(&mountlist_lock));
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*nextp = CIRCLEQ_NEXT(mp, mnt_list);
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}
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return ENOENT;
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}
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if (nextp != NULL) {
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mutex_exit(&mountlist_lock);
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}
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atomic_inc_uint(&mp->mnt_refcnt);
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return 0;
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}
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/*
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* Unbusy a busy filesystem.
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*
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* => If keepref is true, preserve reference added by vfs_busy().
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* => If nextp != NULL, acquire mountlist_lock.
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*/
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void
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vfs_unbusy(struct mount *mp, bool keepref, struct mount **nextp)
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{
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KASSERT(mp->mnt_refcnt > 0);
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if (nextp != NULL) {
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mutex_enter(&mountlist_lock);
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}
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rw_exit(&mp->mnt_unmounting);
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if (!keepref) {
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vfs_destroy(mp);
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}
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if (nextp != NULL) {
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KASSERT(mutex_owned(&mountlist_lock));
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*nextp = CIRCLEQ_NEXT(mp, mnt_list);
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}
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}
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/*
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* Insert a marker vnode into a mount's vnode list, after the
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* specified vnode. mntvnode_lock must be held.
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*/
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void
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vmark(vnode_t *mvp, vnode_t *vp)
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{
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struct mount *mp = mvp->v_mount;
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KASSERT(mutex_owned(&mntvnode_lock));
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KASSERT((mvp->v_iflag & VI_MARKER) != 0);
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KASSERT(vp->v_mount == mp);
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TAILQ_INSERT_AFTER(&mp->mnt_vnodelist, vp, mvp, v_mntvnodes);
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}
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/*
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* Remove a marker vnode from a mount's vnode list, and return
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* a pointer to the next vnode in the list. mntvnode_lock must
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* be held.
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*/
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vnode_t *
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vunmark(vnode_t *mvp)
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{
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struct mount *mp = mvp->v_mount;
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vnode_t *vp;
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KASSERT(mutex_owned(&mntvnode_lock));
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KASSERT((mvp->v_iflag & VI_MARKER) != 0);
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vp = TAILQ_NEXT(mvp, v_mntvnodes);
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TAILQ_REMOVE(&mp->mnt_vnodelist, mvp, v_mntvnodes);
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KASSERT(vp == NULL || vp->v_mount == mp);
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return vp;
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}
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/*
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* Move a vnode from one mount queue to another.
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*/
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void
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vfs_insmntque(vnode_t *vp, struct mount *mp)
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{
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struct mount *omp;
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KASSERT(mp == NULL || (mp->mnt_iflag & IMNT_UNMOUNT) == 0 ||
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vp->v_tag == VT_VFS);
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mutex_enter(&mntvnode_lock);
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/*
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* Delete from old mount point vnode list, if on one.
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*/
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if ((omp = vp->v_mount) != NULL)
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TAILQ_REMOVE(&vp->v_mount->mnt_vnodelist, vp, v_mntvnodes);
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/*
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* Insert into list of vnodes for the new mount point, if
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* available. The caller must take a reference on the mount
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* structure and donate to the vnode.
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*/
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if ((vp->v_mount = mp) != NULL)
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TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes);
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mutex_exit(&mntvnode_lock);
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if (omp != NULL) {
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/* Release reference to old mount. */
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vfs_destroy(omp);
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}
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}
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/*
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* Remove any vnodes in the vnode table belonging to mount point mp.
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*
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* If FORCECLOSE is not specified, there should not be any active ones,
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* return error if any are found (nb: this is a user error, not a
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* system error). If FORCECLOSE is specified, detach any active vnodes
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* that are found.
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*
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* If WRITECLOSE is set, only flush out regular file vnodes open for
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* writing.
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*
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* SKIPSYSTEM causes any vnodes marked VV_SYSTEM to be skipped.
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*/
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#ifdef DEBUG
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int busyprt = 0; /* print out busy vnodes */
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struct ctldebug debug1 = { "busyprt", &busyprt };
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#endif
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static vnode_t *
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vflushnext(vnode_t *mvp, int *when)
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{
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if (hardclock_ticks > *when) {
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mutex_exit(&mntvnode_lock);
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yield();
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mutex_enter(&mntvnode_lock);
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*when = hardclock_ticks + hz / 10;
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}
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return vunmark(mvp);
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}
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int
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vflush(struct mount *mp, vnode_t *skipvp, int flags)
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{
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vnode_t *vp, *mvp;
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int busy = 0, when = 0;
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/* First, flush out any vnode references from vrele_list. */
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vrele_flush();
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/* Allocate a marker vnode. */
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mvp = vnalloc(mp);
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if (mvp == NULL) {
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return ENOMEM;
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}
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/*
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* NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
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* and vclean() are called.
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*/
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mutex_enter(&mntvnode_lock);
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for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp != NULL;
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vp = vflushnext(mvp, &when)) {
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vmark(mvp, vp);
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if (vp->v_mount != mp || vismarker(vp))
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continue;
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/*
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* Skip over a selected vnode.
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*/
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if (vp == skipvp)
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continue;
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mutex_enter(vp->v_interlock);
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/*
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* Ignore clean but still referenced vnodes.
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*/
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if ((vp->v_iflag & VI_CLEAN) != 0) {
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mutex_exit(vp->v_interlock);
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continue;
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}
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/*
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* Skip over a vnodes marked VSYSTEM.
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*/
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if ((flags & SKIPSYSTEM) && (vp->v_vflag & VV_SYSTEM)) {
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mutex_exit(vp->v_interlock);
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continue;
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}
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/*
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* If WRITECLOSE is set, only flush out regular file
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* vnodes open for writing.
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*/
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if ((flags & WRITECLOSE) &&
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(vp->v_writecount == 0 || vp->v_type != VREG)) {
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mutex_exit(vp->v_interlock);
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continue;
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}
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/*
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|
* With v_usecount == 0, all we need to do is clear
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* out the vnode data structures and we are done.
|
|
*/
|
|
if (vp->v_usecount == 0) {
|
|
mutex_exit(&mntvnode_lock);
|
|
vremfree(vp);
|
|
vp->v_usecount = 1;
|
|
vclean(vp, DOCLOSE);
|
|
vrelel(vp, 0);
|
|
mutex_enter(&mntvnode_lock);
|
|
continue;
|
|
}
|
|
/*
|
|
* If FORCECLOSE is set, forcibly close the vnode.
|
|
* For block or character devices, revert to an
|
|
* anonymous device. For all other files, just
|
|
* kill them.
|
|
*/
|
|
if (flags & FORCECLOSE) {
|
|
mutex_exit(&mntvnode_lock);
|
|
atomic_inc_uint(&vp->v_usecount);
|
|
if (vp->v_type != VBLK && vp->v_type != VCHR) {
|
|
vclean(vp, DOCLOSE);
|
|
vrelel(vp, 0);
|
|
} else {
|
|
vclean(vp, 0);
|
|
vp->v_op = spec_vnodeop_p; /* XXXSMP */
|
|
mutex_exit(vp->v_interlock);
|
|
/*
|
|
* The vnode isn't clean, but still resides
|
|
* on the mount list. Remove it. XXX This
|
|
* is a bit dodgy.
|
|
*/
|
|
vfs_insmntque(vp, NULL);
|
|
vrele(vp);
|
|
}
|
|
mutex_enter(&mntvnode_lock);
|
|
continue;
|
|
}
|
|
#ifdef DEBUG
|
|
if (busyprt)
|
|
vprint("vflush: busy vnode", vp);
|
|
#endif
|
|
mutex_exit(vp->v_interlock);
|
|
busy++;
|
|
}
|
|
mutex_exit(&mntvnode_lock);
|
|
vnfree(mvp);
|
|
if (busy)
|
|
return (EBUSY);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Remove clean vnodes from a mountpoint's vnode list.
|
|
*/
|
|
void
|
|
vfs_scrubvnlist(struct mount *mp)
|
|
{
|
|
vnode_t *vp, *nvp;
|
|
|
|
retry:
|
|
mutex_enter(&mntvnode_lock);
|
|
for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) {
|
|
nvp = TAILQ_NEXT(vp, v_mntvnodes);
|
|
mutex_enter(vp->v_interlock);
|
|
if ((vp->v_iflag & VI_CLEAN) != 0) {
|
|
TAILQ_REMOVE(&mp->mnt_vnodelist, vp, v_mntvnodes);
|
|
vp->v_mount = NULL;
|
|
mutex_exit(&mntvnode_lock);
|
|
mutex_exit(vp->v_interlock);
|
|
vfs_destroy(mp);
|
|
goto retry;
|
|
}
|
|
mutex_exit(vp->v_interlock);
|
|
}
|
|
mutex_exit(&mntvnode_lock);
|
|
}
|
|
|
|
/*
|
|
* Mount a file system.
|
|
*/
|
|
|
|
/*
|
|
* Scan all active processes to see if any of them have a current or root
|
|
* directory onto which the new filesystem has just been mounted. If so,
|
|
* replace them with the new mount point.
|
|
*/
|
|
static void
|
|
mount_checkdirs(vnode_t *olddp)
|
|
{
|
|
vnode_t *newdp, *rele1, *rele2;
|
|
struct cwdinfo *cwdi;
|
|
struct proc *p;
|
|
bool retry;
|
|
|
|
if (olddp->v_usecount == 1) {
|
|
return;
|
|
}
|
|
if (VFS_ROOT(olddp->v_mountedhere, &newdp))
|
|
panic("mount: lost mount");
|
|
|
|
do {
|
|
retry = false;
|
|
mutex_enter(proc_lock);
|
|
PROCLIST_FOREACH(p, &allproc) {
|
|
if ((cwdi = p->p_cwdi) == NULL)
|
|
continue;
|
|
/*
|
|
* Cannot change to the old directory any more,
|
|
* so even if we see a stale value it is not a
|
|
* problem.
|
|
*/
|
|
if (cwdi->cwdi_cdir != olddp &&
|
|
cwdi->cwdi_rdir != olddp)
|
|
continue;
|
|
retry = true;
|
|
rele1 = NULL;
|
|
rele2 = NULL;
|
|
atomic_inc_uint(&cwdi->cwdi_refcnt);
|
|
mutex_exit(proc_lock);
|
|
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
|
|
if (cwdi->cwdi_cdir == olddp) {
|
|
rele1 = cwdi->cwdi_cdir;
|
|
vref(newdp);
|
|
cwdi->cwdi_cdir = newdp;
|
|
}
|
|
if (cwdi->cwdi_rdir == olddp) {
|
|
rele2 = cwdi->cwdi_rdir;
|
|
vref(newdp);
|
|
cwdi->cwdi_rdir = newdp;
|
|
}
|
|
rw_exit(&cwdi->cwdi_lock);
|
|
cwdfree(cwdi);
|
|
if (rele1 != NULL)
|
|
vrele(rele1);
|
|
if (rele2 != NULL)
|
|
vrele(rele2);
|
|
mutex_enter(proc_lock);
|
|
break;
|
|
}
|
|
mutex_exit(proc_lock);
|
|
} while (retry);
|
|
|
|
if (rootvnode == olddp) {
|
|
vrele(rootvnode);
|
|
vref(newdp);
|
|
rootvnode = newdp;
|
|
}
|
|
vput(newdp);
|
|
}
|
|
|
|
int
|
|
mount_domount(struct lwp *l, vnode_t **vpp, struct vfsops *vfsops,
|
|
const char *path, int flags, void *data, size_t *data_len)
|
|
{
|
|
vnode_t *vp = *vpp;
|
|
struct mount *mp;
|
|
struct vattr va;
|
|
struct pathbuf *pb;
|
|
struct nameidata nd;
|
|
int error;
|
|
|
|
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
|
|
KAUTH_REQ_SYSTEM_MOUNT_NEW, vp, KAUTH_ARG(flags), data);
|
|
if (error) {
|
|
vfs_delref(vfsops);
|
|
return error;
|
|
}
|
|
|
|
/* Cannot make a non-dir a mount-point (from here anyway). */
|
|
if (vp->v_type != VDIR) {
|
|
vfs_delref(vfsops);
|
|
return ENOTDIR;
|
|
}
|
|
|
|
/*
|
|
* If the user is not root, ensure that they own the directory
|
|
* onto which we are attempting to mount.
|
|
*/
|
|
if ((error = VOP_GETATTR(vp, &va, l->l_cred)) != 0 ||
|
|
(va.va_uid != kauth_cred_geteuid(l->l_cred) &&
|
|
(error = kauth_authorize_generic(l->l_cred,
|
|
KAUTH_GENERIC_ISSUSER, NULL)) != 0)) {
|
|
vfs_delref(vfsops);
|
|
return error;
|
|
}
|
|
|
|
if (flags & MNT_EXPORTED) {
|
|
vfs_delref(vfsops);
|
|
return EINVAL;
|
|
}
|
|
|
|
if ((mp = vfs_mountalloc(vfsops, vp)) == NULL) {
|
|
vfs_delref(vfsops);
|
|
return ENOMEM;
|
|
}
|
|
|
|
mp->mnt_stat.f_owner = kauth_cred_geteuid(l->l_cred);
|
|
|
|
/*
|
|
* The underlying file system may refuse the mount for
|
|
* various reasons. Allow the user to force it to happen.
|
|
*
|
|
* Set the mount level flags.
|
|
*/
|
|
mp->mnt_flag = flags &
|
|
(MNT_FORCE | MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
|
|
MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP |
|
|
MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP |
|
|
MNT_LOG | MNT_IGNORE | MNT_RDONLY);
|
|
|
|
mutex_enter(&mp->mnt_updating);
|
|
error = VFS_MOUNT(mp, path, data, data_len);
|
|
mp->mnt_flag &= ~MNT_OP_FLAGS;
|
|
|
|
if (error != 0)
|
|
goto err_unmounted;
|
|
|
|
/*
|
|
* Validate and prepare the mount point.
|
|
*/
|
|
error = pathbuf_copyin(path, &pb);
|
|
if (error != 0) {
|
|
goto err_mounted;
|
|
}
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb);
|
|
error = namei(&nd);
|
|
pathbuf_destroy(pb);
|
|
if (error != 0) {
|
|
goto err_mounted;
|
|
}
|
|
if (nd.ni_vp != vp) {
|
|
vput(nd.ni_vp);
|
|
error = EINVAL;
|
|
goto err_mounted;
|
|
}
|
|
if (vp->v_mountedhere != NULL) {
|
|
vput(nd.ni_vp);
|
|
error = EBUSY;
|
|
goto err_mounted;
|
|
}
|
|
error = vinvalbuf(vp, V_SAVE, l->l_cred, l, 0, 0);
|
|
if (error != 0) {
|
|
vput(nd.ni_vp);
|
|
goto err_mounted;
|
|
}
|
|
|
|
/*
|
|
* Put the new filesystem on the mount list after root.
|
|
*/
|
|
cache_purge(vp);
|
|
mp->mnt_iflag &= ~IMNT_WANTRDWR;
|
|
|
|
mutex_enter(&mountlist_lock);
|
|
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
|
mutex_exit(&mountlist_lock);
|
|
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
|
|
error = vfs_allocate_syncvnode(mp);
|
|
if (error == 0)
|
|
vp->v_mountedhere = mp;
|
|
vput(nd.ni_vp);
|
|
if (error != 0)
|
|
goto err_onmountlist;
|
|
|
|
mount_checkdirs(vp);
|
|
mutex_exit(&mp->mnt_updating);
|
|
|
|
/* Hold an additional reference to the mount across VFS_START(). */
|
|
vfs_unbusy(mp, true, NULL);
|
|
(void) VFS_STATVFS(mp, &mp->mnt_stat);
|
|
error = VFS_START(mp, 0);
|
|
if (error)
|
|
vrele(vp);
|
|
/* Drop reference held for VFS_START(). */
|
|
vfs_destroy(mp);
|
|
*vpp = NULL;
|
|
return error;
|
|
|
|
err_onmountlist:
|
|
mutex_enter(&mountlist_lock);
|
|
CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
|
|
mp->mnt_iflag |= IMNT_GONE;
|
|
mutex_exit(&mountlist_lock);
|
|
|
|
err_mounted:
|
|
if (VFS_UNMOUNT(mp, MNT_FORCE) != 0)
|
|
panic("Unmounting fresh file system failed");
|
|
|
|
err_unmounted:
|
|
vp->v_mountedhere = NULL;
|
|
mutex_exit(&mp->mnt_updating);
|
|
vfs_unbusy(mp, false, NULL);
|
|
vfs_destroy(mp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Do the actual file system unmount. File system is assumed to have
|
|
* been locked by the caller.
|
|
*
|
|
* => Caller hold reference to the mount, explicitly for dounmount().
|
|
*/
|
|
int
|
|
dounmount(struct mount *mp, int flags, struct lwp *l)
|
|
{
|
|
vnode_t *coveredvp;
|
|
int error, async, used_syncer;
|
|
|
|
#if NVERIEXEC > 0
|
|
error = veriexec_unmountchk(mp);
|
|
if (error)
|
|
return (error);
|
|
#endif /* NVERIEXEC > 0 */
|
|
|
|
/*
|
|
* XXX Freeze syncer. Must do this before locking the
|
|
* mount point. See dounmount() for details.
|
|
*/
|
|
mutex_enter(&syncer_mutex);
|
|
rw_enter(&mp->mnt_unmounting, RW_WRITER);
|
|
if ((mp->mnt_iflag & IMNT_GONE) != 0) {
|
|
rw_exit(&mp->mnt_unmounting);
|
|
mutex_exit(&syncer_mutex);
|
|
return ENOENT;
|
|
}
|
|
|
|
used_syncer = (mp->mnt_syncer != NULL);
|
|
|
|
/*
|
|
* XXX Syncer must be frozen when we get here. This should really
|
|
* be done on a per-mountpoint basis, but the syncer doesn't work
|
|
* like that.
|
|
*
|
|
* The caller of dounmount() must acquire syncer_mutex because
|
|
* the syncer itself acquires locks in syncer_mutex -> vfs_busy
|
|
* order, and we must preserve that order to avoid deadlock.
|
|
*
|
|
* So, if the file system did not use the syncer, now is
|
|
* the time to release the syncer_mutex.
|
|
*/
|
|
if (used_syncer == 0) {
|
|
mutex_exit(&syncer_mutex);
|
|
}
|
|
mp->mnt_iflag |= IMNT_UNMOUNT;
|
|
async = mp->mnt_flag & MNT_ASYNC;
|
|
mp->mnt_flag &= ~MNT_ASYNC;
|
|
cache_purgevfs(mp); /* remove cache entries for this file sys */
|
|
if (mp->mnt_syncer != NULL)
|
|
vfs_deallocate_syncvnode(mp);
|
|
error = 0;
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
|
|
error = VFS_SYNC(mp, MNT_WAIT, l->l_cred);
|
|
}
|
|
vfs_scrubvnlist(mp);
|
|
if (error == 0 || (flags & MNT_FORCE)) {
|
|
error = VFS_UNMOUNT(mp, flags);
|
|
}
|
|
if (error) {
|
|
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0)
|
|
(void) vfs_allocate_syncvnode(mp);
|
|
mp->mnt_iflag &= ~IMNT_UNMOUNT;
|
|
mp->mnt_flag |= async;
|
|
rw_exit(&mp->mnt_unmounting);
|
|
if (used_syncer)
|
|
mutex_exit(&syncer_mutex);
|
|
return (error);
|
|
}
|
|
vfs_scrubvnlist(mp);
|
|
mutex_enter(&mountlist_lock);
|
|
if ((coveredvp = mp->mnt_vnodecovered) != NULLVP)
|
|
coveredvp->v_mountedhere = NULL;
|
|
CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
|
|
mp->mnt_iflag |= IMNT_GONE;
|
|
mutex_exit(&mountlist_lock);
|
|
if (TAILQ_FIRST(&mp->mnt_vnodelist) != NULL)
|
|
panic("unmount: dangling vnode");
|
|
if (used_syncer)
|
|
mutex_exit(&syncer_mutex);
|
|
vfs_hooks_unmount(mp);
|
|
rw_exit(&mp->mnt_unmounting);
|
|
vfs_destroy(mp); /* reference from mount() */
|
|
if (coveredvp != NULLVP) {
|
|
vrele(coveredvp);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unmount all file systems.
|
|
* We traverse the list in reverse order under the assumption that doing so
|
|
* will avoid needing to worry about dependencies.
|
|
*/
|
|
bool
|
|
vfs_unmountall(struct lwp *l)
|
|
{
|
|
|
|
printf("unmounting file systems...");
|
|
return vfs_unmountall1(l, true, true);
|
|
}
|
|
|
|
static void
|
|
vfs_unmount_print(struct mount *mp, const char *pfx)
|
|
{
|
|
|
|
aprint_verbose("%sunmounted %s on %s type %s\n", pfx,
|
|
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname,
|
|
mp->mnt_stat.f_fstypename);
|
|
}
|
|
|
|
bool
|
|
vfs_unmount_forceone(struct lwp *l)
|
|
{
|
|
struct mount *mp, *nmp;
|
|
int error;
|
|
|
|
nmp = NULL;
|
|
|
|
CIRCLEQ_FOREACH_REVERSE(mp, &mountlist, mnt_list) {
|
|
if (nmp == NULL || mp->mnt_gen > nmp->mnt_gen) {
|
|
nmp = mp;
|
|
}
|
|
}
|
|
if (nmp == NULL) {
|
|
return false;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf("\nforcefully unmounting %s (%s)...",
|
|
nmp->mnt_stat.f_mntonname, nmp->mnt_stat.f_mntfromname);
|
|
#endif
|
|
atomic_inc_uint(&nmp->mnt_refcnt);
|
|
if ((error = dounmount(nmp, MNT_FORCE, l)) == 0) {
|
|
vfs_unmount_print(nmp, "forcefully ");
|
|
return true;
|
|
} else {
|
|
vfs_destroy(nmp);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf("forceful unmount of %s failed with error %d\n",
|
|
nmp->mnt_stat.f_mntonname, error);
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
vfs_unmountall1(struct lwp *l, bool force, bool verbose)
|
|
{
|
|
struct mount *mp, *nmp;
|
|
bool any_error = false, progress = false;
|
|
int error;
|
|
|
|
for (mp = CIRCLEQ_LAST(&mountlist);
|
|
mp != (void *)&mountlist;
|
|
mp = nmp) {
|
|
nmp = CIRCLEQ_PREV(mp, mnt_list);
|
|
#ifdef DEBUG
|
|
printf("\nunmounting %p %s (%s)...",
|
|
(void *)mp, mp->mnt_stat.f_mntonname,
|
|
mp->mnt_stat.f_mntfromname);
|
|
#endif
|
|
atomic_inc_uint(&mp->mnt_refcnt);
|
|
if ((error = dounmount(mp, force ? MNT_FORCE : 0, l)) == 0) {
|
|
vfs_unmount_print(mp, "");
|
|
progress = true;
|
|
} else {
|
|
vfs_destroy(mp);
|
|
if (verbose) {
|
|
printf("unmount of %s failed with error %d\n",
|
|
mp->mnt_stat.f_mntonname, error);
|
|
}
|
|
any_error = true;
|
|
}
|
|
}
|
|
if (verbose) {
|
|
printf(" done\n");
|
|
}
|
|
if (any_error && verbose) {
|
|
printf("WARNING: some file systems would not unmount\n");
|
|
}
|
|
return progress;
|
|
}
|
|
|
|
void
|
|
vfs_sync_all(struct lwp *l)
|
|
{
|
|
printf("syncing disks... ");
|
|
|
|
/* remove user processes from run queue */
|
|
suspendsched();
|
|
(void)spl0();
|
|
|
|
/* avoid coming back this way again if we panic. */
|
|
doing_shutdown = 1;
|
|
|
|
do_sys_sync(l);
|
|
|
|
/* Wait for sync to finish. */
|
|
if (buf_syncwait() != 0) {
|
|
#if defined(DDB) && defined(DEBUG_HALT_BUSY)
|
|
Debugger();
|
|
#endif
|
|
printf("giving up\n");
|
|
return;
|
|
} else
|
|
printf("done\n");
|
|
}
|
|
|
|
/*
|
|
* Sync and unmount file systems before shutting down.
|
|
*/
|
|
void
|
|
vfs_shutdown(void)
|
|
{
|
|
lwp_t *l = curlwp;
|
|
|
|
vfs_sync_all(l);
|
|
|
|
/*
|
|
* If we have paniced - do not make the situation potentially
|
|
* worse by unmounting the file systems.
|
|
*/
|
|
if (panicstr != NULL) {
|
|
return;
|
|
}
|
|
|
|
/* Unmount file systems. */
|
|
vfs_unmountall(l);
|
|
}
|
|
|
|
/*
|
|
* Print a list of supported file system types (used by vfs_mountroot)
|
|
*/
|
|
static void
|
|
vfs_print_fstypes(void)
|
|
{
|
|
struct vfsops *v;
|
|
int cnt = 0;
|
|
|
|
mutex_enter(&vfs_list_lock);
|
|
LIST_FOREACH(v, &vfs_list, vfs_list)
|
|
++cnt;
|
|
mutex_exit(&vfs_list_lock);
|
|
|
|
if (cnt == 0) {
|
|
printf("WARNING: No file system modules have been loaded.\n");
|
|
return;
|
|
}
|
|
|
|
printf("Supported file systems:");
|
|
mutex_enter(&vfs_list_lock);
|
|
LIST_FOREACH(v, &vfs_list, vfs_list) {
|
|
printf(" %s", v->vfs_name);
|
|
}
|
|
mutex_exit(&vfs_list_lock);
|
|
printf("\n");
|
|
}
|
|
|
|
/*
|
|
* Mount the root file system. If the operator didn't specify a
|
|
* file system to use, try all possible file systems until one
|
|
* succeeds.
|
|
*/
|
|
int
|
|
vfs_mountroot(void)
|
|
{
|
|
struct vfsops *v;
|
|
int error = ENODEV;
|
|
|
|
if (root_device == NULL)
|
|
panic("vfs_mountroot: root device unknown");
|
|
|
|
switch (device_class(root_device)) {
|
|
case DV_IFNET:
|
|
if (rootdev != NODEV)
|
|
panic("vfs_mountroot: rootdev set for DV_IFNET "
|
|
"(0x%llx -> %llu,%llu)",
|
|
(unsigned long long)rootdev,
|
|
(unsigned long long)major(rootdev),
|
|
(unsigned long long)minor(rootdev));
|
|
break;
|
|
|
|
case DV_DISK:
|
|
if (rootdev == NODEV)
|
|
panic("vfs_mountroot: rootdev not set for DV_DISK");
|
|
if (bdevvp(rootdev, &rootvp))
|
|
panic("vfs_mountroot: can't get vnode for rootdev");
|
|
error = VOP_OPEN(rootvp, FREAD, FSCRED);
|
|
if (error) {
|
|
printf("vfs_mountroot: can't open root device\n");
|
|
return (error);
|
|
}
|
|
break;
|
|
|
|
case DV_VIRTUAL:
|
|
break;
|
|
|
|
default:
|
|
printf("%s: inappropriate for root file system\n",
|
|
device_xname(root_device));
|
|
return (ENODEV);
|
|
}
|
|
|
|
/*
|
|
* If user specified a root fs type, use it. Make sure the
|
|
* specified type exists and has a mount_root()
|
|
*/
|
|
if (strcmp(rootfstype, ROOT_FSTYPE_ANY) != 0) {
|
|
v = vfs_getopsbyname(rootfstype);
|
|
error = EFTYPE;
|
|
if (v != NULL) {
|
|
if (v->vfs_mountroot != NULL) {
|
|
error = (v->vfs_mountroot)();
|
|
}
|
|
v->vfs_refcount--;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Try each file system currently configured into the kernel.
|
|
*/
|
|
mutex_enter(&vfs_list_lock);
|
|
LIST_FOREACH(v, &vfs_list, vfs_list) {
|
|
if (v->vfs_mountroot == NULL)
|
|
continue;
|
|
#ifdef DEBUG
|
|
aprint_normal("mountroot: trying %s...\n", v->vfs_name);
|
|
#endif
|
|
v->vfs_refcount++;
|
|
mutex_exit(&vfs_list_lock);
|
|
error = (*v->vfs_mountroot)();
|
|
mutex_enter(&vfs_list_lock);
|
|
v->vfs_refcount--;
|
|
if (!error) {
|
|
aprint_normal("root file system type: %s\n",
|
|
v->vfs_name);
|
|
break;
|
|
}
|
|
}
|
|
mutex_exit(&vfs_list_lock);
|
|
|
|
if (v == NULL) {
|
|
vfs_print_fstypes();
|
|
printf("no file system for %s", device_xname(root_device));
|
|
if (device_class(root_device) == DV_DISK)
|
|
printf(" (dev 0x%llx)", (unsigned long long)rootdev);
|
|
printf("\n");
|
|
error = EFTYPE;
|
|
}
|
|
|
|
done:
|
|
if (error && device_class(root_device) == DV_DISK) {
|
|
VOP_CLOSE(rootvp, FREAD, FSCRED);
|
|
vrele(rootvp);
|
|
}
|
|
if (error == 0) {
|
|
extern struct cwdinfo cwdi0;
|
|
|
|
CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS;
|
|
CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++;
|
|
|
|
/*
|
|
* Get the vnode for '/'. Set cwdi0.cwdi_cdir to
|
|
* reference it.
|
|
*/
|
|
error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode);
|
|
if (error)
|
|
panic("cannot find root vnode, error=%d", error);
|
|
cwdi0.cwdi_cdir = rootvnode;
|
|
vref(cwdi0.cwdi_cdir);
|
|
VOP_UNLOCK(rootvnode);
|
|
cwdi0.cwdi_rdir = NULL;
|
|
|
|
/*
|
|
* Now that root is mounted, we can fixup initproc's CWD
|
|
* info. All other processes are kthreads, which merely
|
|
* share proc0's CWD info.
|
|
*/
|
|
initproc->p_cwdi->cwdi_cdir = rootvnode;
|
|
vref(initproc->p_cwdi->cwdi_cdir);
|
|
initproc->p_cwdi->cwdi_rdir = NULL;
|
|
/*
|
|
* Enable loading of modules from the filesystem
|
|
*/
|
|
module_load_vfs_init();
|
|
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* mount_specific_key_create --
|
|
* Create a key for subsystem mount-specific data.
|
|
*/
|
|
int
|
|
mount_specific_key_create(specificdata_key_t *keyp, specificdata_dtor_t dtor)
|
|
{
|
|
|
|
return specificdata_key_create(mount_specificdata_domain, keyp, dtor);
|
|
}
|
|
|
|
/*
|
|
* mount_specific_key_delete --
|
|
* Delete a key for subsystem mount-specific data.
|
|
*/
|
|
void
|
|
mount_specific_key_delete(specificdata_key_t key)
|
|
{
|
|
|
|
specificdata_key_delete(mount_specificdata_domain, key);
|
|
}
|
|
|
|
/*
|
|
* mount_initspecific --
|
|
* Initialize a mount's specificdata container.
|
|
*/
|
|
void
|
|
mount_initspecific(struct mount *mp)
|
|
{
|
|
int error;
|
|
|
|
error = specificdata_init(mount_specificdata_domain,
|
|
&mp->mnt_specdataref);
|
|
KASSERT(error == 0);
|
|
}
|
|
|
|
/*
|
|
* mount_finispecific --
|
|
* Finalize a mount's specificdata container.
|
|
*/
|
|
void
|
|
mount_finispecific(struct mount *mp)
|
|
{
|
|
|
|
specificdata_fini(mount_specificdata_domain, &mp->mnt_specdataref);
|
|
}
|
|
|
|
/*
|
|
* mount_getspecific --
|
|
* Return mount-specific data corresponding to the specified key.
|
|
*/
|
|
void *
|
|
mount_getspecific(struct mount *mp, specificdata_key_t key)
|
|
{
|
|
|
|
return specificdata_getspecific(mount_specificdata_domain,
|
|
&mp->mnt_specdataref, key);
|
|
}
|
|
|
|
/*
|
|
* mount_setspecific --
|
|
* Set mount-specific data corresponding to the specified key.
|
|
*/
|
|
void
|
|
mount_setspecific(struct mount *mp, specificdata_key_t key, void *data)
|
|
{
|
|
|
|
specificdata_setspecific(mount_specificdata_domain,
|
|
&mp->mnt_specdataref, key, data);
|
|
}
|
|
|
|
/*
|
|
* Check to see if a filesystem is mounted on a block device.
|
|
*/
|
|
int
|
|
vfs_mountedon(vnode_t *vp)
|
|
{
|
|
vnode_t *vq;
|
|
int error = 0;
|
|
|
|
if (vp->v_type != VBLK)
|
|
return ENOTBLK;
|
|
if (vp->v_specmountpoint != NULL)
|
|
return (EBUSY);
|
|
mutex_enter(&device_lock);
|
|
for (vq = specfs_hash[SPECHASH(vp->v_rdev)]; vq != NULL;
|
|
vq = vq->v_specnext) {
|
|
if (vq->v_type != vp->v_type || vq->v_rdev != vp->v_rdev)
|
|
continue;
|
|
if (vq->v_specmountpoint != NULL) {
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
}
|
|
mutex_exit(&device_lock);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Check if a device pointed to by vp is mounted.
|
|
*
|
|
* Returns:
|
|
* EINVAL if it's not a disk
|
|
* EBUSY if it's a disk and mounted
|
|
* 0 if it's a disk and not mounted
|
|
*/
|
|
int
|
|
rawdev_mounted(vnode_t *vp, vnode_t **bvpp)
|
|
{
|
|
vnode_t *bvp;
|
|
dev_t dev;
|
|
int d_type;
|
|
|
|
bvp = NULL;
|
|
d_type = D_OTHER;
|
|
|
|
if (iskmemvp(vp))
|
|
return EINVAL;
|
|
|
|
switch (vp->v_type) {
|
|
case VCHR: {
|
|
const struct cdevsw *cdev;
|
|
|
|
dev = vp->v_rdev;
|
|
cdev = cdevsw_lookup(dev);
|
|
if (cdev != NULL) {
|
|
dev_t blkdev;
|
|
|
|
blkdev = devsw_chr2blk(dev);
|
|
if (blkdev != NODEV) {
|
|
if (vfinddev(blkdev, VBLK, &bvp) != 0) {
|
|
d_type = (cdev->d_flag & D_TYPEMASK);
|
|
/* XXX: what if bvp disappears? */
|
|
vrele(bvp);
|
|
}
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case VBLK: {
|
|
const struct bdevsw *bdev;
|
|
|
|
dev = vp->v_rdev;
|
|
bdev = bdevsw_lookup(dev);
|
|
if (bdev != NULL)
|
|
d_type = (bdev->d_flag & D_TYPEMASK);
|
|
|
|
bvp = vp;
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (d_type != D_DISK)
|
|
return EINVAL;
|
|
|
|
if (bvpp != NULL)
|
|
*bvpp = bvp;
|
|
|
|
/*
|
|
* XXX: This is bogus. We should be failing the request
|
|
* XXX: not only if this specific slice is mounted, but
|
|
* XXX: if it's on a disk with any other mounted slice.
|
|
*/
|
|
if (vfs_mountedon(bvp))
|
|
return EBUSY;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Make a 'unique' number from a mount type name.
|
|
*/
|
|
long
|
|
makefstype(const char *type)
|
|
{
|
|
long rv;
|
|
|
|
for (rv = 0; *type; type++) {
|
|
rv <<= 2;
|
|
rv ^= *type;
|
|
}
|
|
return rv;
|
|
}
|