NetBSD-5.0.2/usr.sbin/vnconfig/vnconfig.8

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.\"	$NetBSD: vnconfig.8,v 1.34 2008/05/02 18:11:06 martin Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
.\"
.\" Redistribution and use in source and binary forms, with or without
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.\" Copyright (c) 1980, 1989, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
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.\" This code is derived from software contributed to Berkeley by
.\" the Systems Programming Group of the University of Utah Computer
.\" Science Department.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
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.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
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.\" 3. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" Copyright (c) 1993 University of Utah.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Systems Programming Group of the University of Utah Computer
.\" Science Department.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     @(#)vnconfig.8	8.1 (Berkeley) 6/5/93
.\"
.Dd July 16, 2005
.Dt VNCONFIG 8
.Os
.Sh NAME
.Nm vnconfig
.Nd configure vnode disks
.Sh SYNOPSIS
.Nm
.Op Fl crvz
.Op Fl f Ar disktab
.Op Fl t Ar typename
.Ar vnode_disk
.Ar regular_file
.Op Ar geomspec
.Nm
.Fl u
.Op Fl Fv
.Ar vnode_disk
.Nm
.Fl l
.Op Ar vnode_disk
.Sh DESCRIPTION
The
.Nm
command configures vnode pseudo disk devices.
It will associate the vnode disk
.Ar vnode_disk
with the regular file
.Ar regular_file
allowing the latter to be accessed as though it were a disk.
Hence a regular file within the filesystem can be used for swapping
or can contain a filesystem that is mounted in the name space.
The
.Ar vnode_disk
is a special file of raw partition or name of vnode disk like
.Pa vnd0 .
.Pp
Options indicate an action to be performed:
.Bl -tag -width indent
.It Fl c
Configures the device.
If successful, references to
.Ar vnode_disk
will access the contents of
.Ar regular_file .
.Pp
If
.Ar geomspec
is specified, the vnode device will emulate the specified disk geometry.
The format of the
.Ar geomspec
argument is:
.Bd -ragged -offset indent
.Sm off
.Xo Ar secsize Li / Ar nsectors Li /
.Ar ntracks Li / Ar ncylinders Xc
.Sm on
.Ed
.Pp
If geometry is not specified, the kernel will choose a default based on 1MB
cylinders.
.Ar secsize
is the number of bytes per sector.  It must be an even multiple of 512.
.Ar nsectors
is the number of sectors per track.
.Ar ntracks
is the number of tracks per cylinder.
.Ar ncylinders
is the number of cylinders in the device.
.It Fl F
Force unconfiguration if the device is in use.
Does not imply
.Fl u .
.It Fl f Ar disktab
Specifies that the
.Fl t
option should look up in
.Ar disktab
instead of in
.Pa /etc/disktab .
.It Fl l
List the vnd devices and indicate which ones are in use.  If a specific
.Ar vnode_disk
is given, then only that will be described.
.It Fl t Ar typename
If configuring the device, look up
.Ar typename
in
.Pa /etc/disktab
and use the geometry specified in the entry.  This option and the
.Ar geomspec
argument are mutually exclusive.
.It Fl r
Configure the device as read-only.
.It Fl u
Unconfigures the device.
.It Fl v
Print messages to stdout describing actions taken.
.It Fl z
Assume that
.Ar regular_file
is a compressed disk image in cloop2 format, and configure it
read-only.
See the
.Xr vndcompress 1
manpage on how to create such an image.
.El
.Pp
If no action option is given,
.Fl c
is assumed.
.Sh FILES
.Bl -tag -width /etc/disktab -compact
.It Pa /dev/rvnd??
.It Pa /dev/vnd??
.It Pa /etc/disktab
.El
.Sh EXAMPLES
.Dl vnconfig vnd0 /tmp/diskimage
or
.Dl vnconfig /dev/rvnd0c /tmp/diskimage
.Pp
Configures the vnode disk
.Pa vnd0 .
Please note that use of the second form of the command is discouraged because
it requires knowledge of the raw partition which varies between architectures.
.Pp
.Dl vnconfig vnd0 /tmp/floppy.img 512/18/2/80
.Pp
Configures the vnode disk
.Pa vnd0
emulating the geometry of 512 bytes per sector, 18 sectors per track,
2 tracks per cylinder, and 80 cylinders total.
.Pp
.Dl vnconfig -t floppy vnd0 /tmp/floppy.img
.Pp
Configures the vnode disk
.Pa vnd0
using the geometry specified in the
.Pa floppy
entry in
.Pa /etc/disktab .
.Pp
.Dl vnconfig -u vnd0
.Pp
Unconfigures the
.Pa vnd0
device.
.Sh SEE ALSO
.Xr opendisk 3 ,
.Xr vnd 4 ,
.Xr mount 8 ,
.Xr swapctl 8 ,
.Xr umount 8
.Sh HISTORY
The
.Nm
command appeared in
.Nx 1.0 .
.Sh BUGS
This command should really be named
.Nm vndconfig .