Klaus,
But at least one success report: Since today, we finally have a cloop (2.622) that works with Kernel 2.6.22 and (probably) above. We are staying with cloop, since it's filesystem-independent and (at least in the previous versions) less likely to crash on physical read errors.
Where is the source?! I'd like to give it a go w/ 2.6.22.7. Thanks, Cecil