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+.\"	$NetBSD: vnd.4,v 1.19 2017/09/29 08:46:47 maya Exp $
+.\"
+.\" Copyright (c) 1996, 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
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd September 29, 2017
+.Dt VND 4
+.Os
+.Sh NAME
+.Nm vnd
+.Nd vnode disk driver
+.Sh SYNOPSIS
+.Cd "pseudo-device vnd"
+.Cd "options VND_COMPRESSION"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides a disk-like interface to a file.
+This is useful for a variety of applications, including swap files
+and building miniroot or floppy disk images.
+.Pp
+This document assumes that you're familiar with how to generate kernels
+and how to properly configure disks and pseudo-devices in a kernel
+configuration file.
+.Pp
+In order to compile in support for the
+.Nm ,
+you must add a line similar
+to the following to your kernel configuration file:
+.Bd -unfilled -offset indent
+pseudo-device	vnd		# vnode disk driver
+.Ed
+.Pp
+To also compile in support for reading compressed disk images,
+add the following option to your kernel config file:
+.Bd -unfilled -offset indent
+options        VND_COMPRESSION    # compressed vnd(4)
+.Ed
+.Pp
+Compressed disk images are expected in the cloop2 format.
+They can be created from
+.Dq normal
+disk images by the
+.Xr vndcompress 1
+program.
+.Pp
+There is a run-time utility that is used for configuring
+both compressed and uncompressed
+.Nm vnd Ns s ;
+see
+.Xr vnconfig 8
+for more information.
+.Sh FILES
+.Bl -tag -width /dev/XXrXvndX -compact
+.It Pa /dev/{,r}vnd*
+vnd device special files.
+.El
+.Sh SEE ALSO
+.Xr config 1 ,
+.Xr vndcompress 1 ,
+.Xr fsck 8 ,
+.Xr MAKEDEV 8 ,
+.Xr mount 8 ,
+.Xr newfs 8 ,
+.Xr vnconfig 8
+.Sh HISTORY
+The vnode disk driver was originally written at the University of
+Utah.
+The compression handling is based on code by
+.An Cliff Wright
+.Aq cliff@snipe444.org .
+.Sh BUGS
+The
+.Nm
+driver does not work if the file does not reside in a local filesystem.