There's an accompanying anaconda patch, coming right up.
mulhern (2): Add BTRFSValueError error and use in btrfs related code (#1019685) Check if device has enough members when setting RAID level (#1019685)
blivet/devicelibs/btrfs.py | 20 ++++++------ blivet/devices.py | 76 +++++++++++++++++++++++++++++++++++----------- blivet/errors.py | 3 ++ 3 files changed, 72 insertions(+), 27 deletions(-)