VND(4) FreeBSD Kernel Interfaces Manual VND(4)
NAME
vnd - vnode disk driver
SYNOPSIS
pseudo-device vnd
options VND_COMPRESSION
DESCRIPTION
The vnd 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.
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.
In order to compile in support for the vnd, you must add a line similar
to the following to your kernel configuration file:
pseudo-device vnd # vnode disk driver
To also compile in support for reading compressed disk images, add the
following option to your kernel config file:
options VND_COMPRESSION # compressed vnd(4)
Compressed disk images are expected in the cloop2 format. They can be
created from "normal" disk images by the vndcompress(1) program.
There is a run-time utility that is used for configuring both compressed
and uncompressed vnds; see vnconfig(8) for more information.
FILES
/dev/{,r}vnd* vnd device special files.
SEE ALSO
config(1), vndcompress(1), fsck(8), MAKEDEV(8), mount(8), newfs(8),
vnconfig(8)
HISTORY
The vnode disk driver was originally written at the University of Utah.
The compression handling is based on code by Cliff Wright
<
[email protected]>.
BUGS
The vnd driver does not work if the file does not reside in a local
filesystem.
FreeBSD 14.1-RELEASE-p8 September 29, 2017 FreeBSD 14.1-RELEASE-p8