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Josef Bacik authored
These were added to deal with duplicated functionality within btrfs-progs, but we specifically copied rbtree.c from the kernel, so move these functions out into their own file. This will make it easier to keep rbtree.c in sync. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: David Sterba <dsterba@suse.cz>
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