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geom_uzip.4freebsd

BSD mandoc

NAME

geom_uzip - GEOM based compressed disk images

SYNOPSIS

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

options GEOM_UZIP

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:

 geom_uzip_load="YES"
 

DESCRIPTION

The 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 to detect compressed images which have been created with mkuzip(8) and presented to the kernel as a logical disk device via md(4). creates a unique md#.uzip device for each image.

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

SEE ALSO

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

AUTHORS

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