Comment 27 for bug 748340

Trying to convert ext4 to btrfs, i get same error when starting up. Using beta2 2012-04 and grub2.
!Retyped!
fsck from util-linux 2.20.1
couldn't open because of unsupported option features (2).
fsck.btrfs: disk-io.c:679: open_ctree_fd: Assertion `!(1)' failed.
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Ignoring errors with / at user request
mount: / not mounted or bad option
mountall: mount / [990] terminated with status 32
mountall: Filesystem could not be mounted: /