On Sat, Apr 02, 2011 at 02:13:01PM -0700, John R Pierce spake thusly:
ZFS isn't GPL, therefore can't be integrated into the kernel where a file system belongs, therefore is pretty much relegated to user space
It can be patched in by the end user. So if someone were to distribute a patch which could be dropped into a current SRPM by the end user and a change to the SPEC file made to apply the patch during the rpm build the user would be all set.