geom_uzip - GEOM based compressed disk images

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To compile this driver into the kernel, place the following line in your kernel configuration file:

.Cd options GEOM_UZIP

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

geom_uzip_load="YES"

The geom_uzip framework provides support for compressed read only disk images. This allows significant storage savings at the expense of a little CPU time on each read. Data written in the GEOM label area allows geom_uzip to detect compressed images which have been created with mkuzip(8) and presented to the kernel as a logical disk device via md(4). geom_uzip creates a unique md#.uzip device for each image.

The geom_uzip device is subsequently used by the
.Fx kernel to access the disk images. The geom_uzip driver does not allow write operations to the underlying disk image. To check which md(4) devices match a given geom_uzip device:

# geom uzip list
Geom name: md1.uzip
Providers:
1. Name: md1.uzip
   Mediasize: 22003712 (21M)
   Sectorsize: 512
   Mode: r1w0e1
Consumers:
1. Name: md1
   Mediasize: 9563648 (9.1M)
   Sectorsize: 512
   Mode: r1w0e1

GEOM(4), md(4), geom(8), mkuzip(8)

.An -nosplit The geom_uzip driver was written by
.An Max Khon Aq fjoe@FreeBSD.org . This manual page was written by
.An Ceri Davies Aq ceri@FreeBSD.org .

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