Important notice before downloading software
By downloading the software you agree with the license-conditions of the
(an open source license).
You are strongly advised to read these conditions before
you download the software.
The license states that the software is offered to you "as is",
which means that guarantee and liability is limited.
If you want to use this software, please verify
whether the software meets your requirements a.o. by reading the
product-description on this web-site and the manual-pages delivered
with the software-package.
To ensure that you have downloaded the authentic version of the
cowloop-software, an MD5 checksum is delivered for every package.
You can determine the MD5 checksum by running the command
Alternatively one can use the signature files (those ending in
.sig) to verify the authenticity of the
Our public key,
has been uploaded to
and can be found on many keyservers.
If you have any questions or remarks, please contact the
of this software-package.
Download cowloop for Linux version 2.6.31
Version 3.2.0 and higher (Sep.2009) of cowloop: driver in mainline 2.6.32 kernel. Cowloop
utils does not contain the kernel module anymore. This is a pre-release
of the cowloop utilities for those wanting to experiment with the current development driver
which is made ready for 2.6.32. See the "news" page to learn more.
Download cowloop for Linux version 2.6
version 3.1 (Feb.2009) of cowloop: patches for Linux kernels up to 2.6.28.
Download cowloop for Linux version 2.4
Version 1 of the cowloop driver can be used for Linux kernel version 2.4.
Notice that this version of the cowloop driver is not actively maintained
Its functionality deviates from the description on this web-site:
The cowloop driver only supports one cowdevice
/dev/cowloop) that can only be activated by specifying
The size of the read-only file and cowfile is limited to 2 Gbytes.
The cowloop driver modifies the bitlist more frequently
to keep the cowfile in a consistent state (which means a
performance-degradation compared to version 2).
Load & unload
The optional parameter "
is not supported. There is no possibility to garantee the consistency
of the cowfile.
A cowfile does not contain header-information.
This implies that there is no possibility to verify whether an existing
cowfile is related to the specified read-only file.
The related commands to repair or query cowfiles are not delivered.
The layout of the status-information retrieved by reading
/proc/cowloop is different.