11.04 B1 Btrfs

[New Mont]

Hi all

With a clean install of 11.04 B1, I partitioned slice0 for / with
Btrfs and slice1 for /home with ext4. Did a touch, dd, mkswap to
produce a swapfile successfully but swapon failed (Swapon failed -
invalid argument). Switched to a swapfile on /home and it succeeded.
Any reason why swapfile/swapon on Btrfs have this problem? Previously,
there was no problem when / was on ext4.

PS: There is no flash plugins in Chromium in Beta1? I had uninstalled Firefox.

Thanks.