On Wed, 15 Aug 2012 18:50:44 -0500
Stan Hoeppner [off-list ref] wrote:

TTBOMK there are two, and only two, COW filesystems in existence:  ZFS and BTRFS.

There is also NILFS2: http://www.nilfs.org/en/
And in general, any https://en.wikipedia.org/wiki/Log-structured_file_system
is COW by design, but afaik of those only NILFS is also in the mainline Linux
kernel AND is not aimed just for some niche like flash-based devices, but for
general-purpose usage.

-- 
With respect,
Roman

~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Stallman had a printer,
with code he could not see.
So he began to tinker,
and set the software free."