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.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.
p 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.
p In order to compile in support for the .Nm , you must add a line similar to the following to your kernel configuration file: d -unfilled -offset indent pseudo-device vnd # vnode disk driver .Ed
p To also compile in support for reading compressed disk images, add the following option to your kernel config file: d -unfilled -offset indent options VND_COMPRESSION # compressed vnd(4) .Ed
p Compressed disk images are expected in the cloop2 format. They can be created from .Dq normal disk images by the .Xr vndcompress 1 program.
p 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 l -tag -width /dev/XXrXvndX -compact t 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 (at] snipe444.org . .Sh BUGS The .Nm driver does not work if the file does not reside in a local filesystem.
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