dm bufio: clean up rbtree block ordering
dm-bufio uses unnatural ordering in the rb-tree - blocks with smaller numbers were put to the right node and blocks with bigger numbers were put to the left node. Reverse that logic so that it's natural. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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