Enhance the output to print:
1) the eason
2) the ad value, if reason is not sufficient
3) good value (range)
Signed-off-by: NQu Wenruo <quwenruo.btrfs@gmx.com>
[ wording, unidented long strings ]
Signed-off-by: NDavid Sterba <dsterba@suse.com>