NetBSD/usr.sbin/vnconfig/vnconfig.8

.\"	$NetBSD: vnconfig.8,v 1.12 1997/10/18 03:54:00 lukem Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
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.\" modification, are permitted provided that the following conditions
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.\"    must display the following acknowledgement:
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.\"	Foundation, Inc. and its contributors.
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
.\"    contributors may be used to endorse or promote products derived
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" Copyright (c) 1993 University of Utah.
.\" 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.
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.\" 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.
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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)
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.\"     @(#)vnconfig.8	8.1 (Berkeley) 6/5/93
.\"
.Dd July 8, 1993
.Dt VNCONFIG 8
.Os BSD 4
.Sh NAME
.Nm vnconfig
.Nd configure vnode disks
.Sh SYNOPSIS
.Nm
.Op Fl c
.Op Fl t Ar typename
.Op Fl v
.Ar vnode_disk
.Ar regular_file
.Op Ar geomspec
.Nm ""
.Fl u
.Op Fl v
.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 .
If
.Op Ar geomspec
is specified, the vnode device will emulate the specified disk geometry.
The format of the
.Op Ar geomspec
argument is
.Dq secsize/nsectors/ntracks/ncylinders .
If geometry is not specified, the kernel will choose a default based on 1MB
cylinders.
.Dq secsize
is the number of bytes per sector.  It must be an even multiple of 512.
.Dq nsectors
is the number of sectors per track.
.Dq ntracks
is the number of tracks per cylinder.
.Dq ncylinders
is the number of cylinders in the device.
.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 is mutually
exclusive the
.Ar geomspec
argument.
.It Fl u
Unconfigures the device.
.It Fl v
Print messages to stdout describing actions taken.
.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
.Pp
.Dl vnconfig /dev/vnd0c /tmp/diskimage
or
.Dl vnconfig vnd0 /tmp/diskimage
.Pp
Configures the vnode disk
.Pa vnd0 .
.Pp
.Dl vnconfig /dev/vnd0c /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
.Pp
.Dl vnconfig -t floppy /dev/vnd0c /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 /dev/vnd0c
.Pp
Unconfigures the
.Pa vnd0
device.
.Sh BUGS
This command should really be named
.Nm vndconfig .
.Sh SEE ALSO
.Xr opendisk 3 ,
.Xr swapctl 8 ,
.Xr mount 8 ,
.Xr umount 8 ,
.Xr vnd 4 .