Btrfs support only partial

[herriett]

The initramfs supports mounting single-device btrfs partitions, however both /sbin/btrfs and /sbin/btrfsck are missing. Therefore it is not possible to do a "btrfs device scan" which is necessary for mounting multi-device (e.g. raid1 or any other more fancy configs) btrfs filesystems. So if your root does use btrfs' internal raid it cannot be mounted. And in case anything has to be repaired there is no fsck for this filesystem. Dangerous...