1.\" 2.\" Copyright (c) 2006 Ceri Davies 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd October 9, 2006 29.Os 30.Dt GEOM_UZIP 4 31.Sh NAME 32.Nm geom_uzip 33.Nd "GEOM based compressed disk images" 34.Sh SYNOPSIS 35To compile this driver into the kernel, 36place the following line in your 37kernel configuration file: 38.Bd -ragged -offset indent 39.Cd "options GEOM_UZIP" 40.Ed 41.Pp 42Alternatively, to load the driver as a 43module at boot time, place the following line in 44.Xr loader.conf 5 : 45.Bd -literal -offset indent 46geom_uzip_load="YES" 47.Ed 48.Sh DESCRIPTION 49The 50.Nm 51framework provides support for compressed read only 52disk images. 53This allows significant storage savings at the expense of 54a little CPU time on each read. 55Data written in the GEOM label area allows 56.Nm 57to detect compressed images which have been created with 58.Xr mkuzip 8 59and presented to the kernel as a logical disk device via 60.Xr md 4 . 61.Nm 62creates a unique 63.Pa md#.uzip 64device for each image. 65.Pp 66The 67.Nm 68device is subsequently used by the 69.Fx 70kernel to access the disk images. 71The 72.Nm 73driver does not allow write operations to the underlying disk image. 74To check which 75.Xr md 4 76devices match a given 77.Nm 78device: 79.Bd -literal -offset indent 80# geom uzip list 81Geom name: md1.uzip 82Providers: 831. Name: md1.uzip 84 Mediasize: 22003712 (21M) 85 Sectorsize: 512 86 Mode: r1w0e1 87Consumers: 881. Name: md1 89 Mediasize: 9563648 (9.1M) 90 Sectorsize: 512 91 Mode: r1w0e1 92.Ed 93.Pp 94.Sh SEE ALSO 95.Xr GEOM 4 , 96.Xr md 4 , 97.Xr geom 8 , 98.Xr mkuzip 8 99.Sh AUTHORS 100.An -nosplit 101The 102.Nm 103driver was written by 104.An "Max Khon" Aq fjoe@FreeBSD.org . 105This manual page was written by 106.An "Ceri Davies" Aq ceri@FreeBSD.org . 107