6.0-BETA3: ext2fs: no cp(1) possible, mmap returns EINVAL

Greetings,

I mounted a Linux ext3 as ext2fs, which worked fine. However, trying to
cvsupd or cp data out of the partition was refused, tracing the
processes revealed that mmap() returned EINVAL.

rsync(1) (from ports) worked though.

Are further details required? If so, which?

TIA.

Regards,

-- 
Matthias Andree