2010-06-01  Colin Watson  <cjwatson@ubuntu.com>

	Add btrfs probing support, currently only in the single-device case.

	* kern/emu/getroot.c (find_root_device_from_mountinfo): New
	function.
	(grub_guess_root_device): Call find_root_device_from_mountinfo
	before looking in /dev.