OK it must be this.
:/# cat /usr/lib/udev/rules.d/64-btrfs.rules
# do not edit this file, it will be overwritten on update
SUBSYSTEM!="block", GOTO="btrfs_end"
ACTION=="remove", GOTO="btrfs_end"
ENV{ID_FS_TYPE}!="btrfs", GOTO="btrfs_end"
# let the kernel know about this btrfs filesystem, and check if it is complete
IMPORT{builtin}="btrfs ready $devnode"
# mark the device as not ready to be used by the system
ENV{ID_BTRFS_READY}=="0", ENV{SYSTEMD_READY}="0"
LABEL="btrfs_end"
--
Chris Murphy
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