SGZip loopback driver (sgloop.o)
		   --------------------------------
Module modified from the cloop module by Michael Cohen (scudette@users.sourceforge.net) (C) 2004.

This driver allow you to mount sgzipped images by proving a kernel module to support the sgzip format. To install:

make

create a device node if you dont have dev fs:

mknod /dev/sgloop b 241 0

This will produce a sgloop.o module. Load the modules as root:

insmod ./sgloop.o file=/path/to/sgzip/file.sgz

now you may mount it:
mount -t ext2 /dev/sgloop /mnt/point
		    
	
This module is heavily borrowed from the standard cloop distribution. The cloop format is very similar to sgzip, but the indexes are kept the start of the file, which forces the compressor to use a lot of memory to keep the entire image in virtual memory before an index can be created. This makes cloop unsuitable for forensic images.

Other than this exception, the following cloop documentation will apply to sgloop as well.


		    COMPRESSED LOOPBACK DEVICE (cloop.o)
=============================================================================

DISCLAIMER: THE AUTHORS HEREBY DENY ANY WARRANTY FOR ANY DATA LOSS AND
DAMAGE WHATSOEVER THAT MAY BE CAUSED DIRECTLY OR INDIRECTLY BY USING THIS
SOFTWARE. THIS IS EXPERIMENTAL SOFTWARE. USE AT YOUR OWN RISK.

This module is licensed under the GNU GENERAL PUBLIC LICENSE Version 2, as
stated in the source.

-----------------------------------------------------------------------------

This is cloop, a Kernel module to add support for filesystem-independent,
transparently decompressed, read-only block devices.

Original Author: Paul 'Rusty' Russel
Extensions & Bugfixes: Klaus Knopper (http://www.knopper.net/knoppix/)

INSTALLATION:
-------------

make KERNEL_DIR=/path/to/linux-kernel/sources
(as root) mkdir -p /lib/modules/misc && cp cloop.o /lib/modules/misc/ 
(as root) depmod -a
(as root) mknod /dev/cloop b 240 0
(as root) mknod /dev/cloop1 b 240 1
...

USAGE:
------

Creating a compressed image:
 create_compressed_fs image blocksize > image.cloop_compressed

blocksize must be a multiple of 512  bytes. Make sure you have enough
swap to hold the entire compressed image in virtual memory! Use "-"
as filename to read data from stdin, as in:

 mkisofs -r datadir | create_compressed_fs - 65536 > datadir.iso.compressed

Mounting a compressed image (see above for device creation):
 insmod cloop.o file=/path/to/compressed/image
 mount -o ro -t whatever /dev/cloop /mnt/compressed

Starting from cloop version 1.0, setting of cloop compressed files via
losetup /dev/cloop1 /path/to/file
is possible. cloop 1.0 uses 64bit pointers instead of 32bit, so cloop files
are no longer limited to <= 4GB (uncompressed size).

For more information, please refer to the sources. If you don't understand
what all this is about, please DON'T EVEN ATTEMPT TO INSTALL OR USE THIS
SOFTWARE.

A download location for the currentmost version of this module
has been provided at: http://www.knopper.net/knoppix/sources/

		-Klaus Knopper 29.08.2003 <cloop@knopper.net>