rbmap
struct rbmap;
static int rbmap_cmp(struct rbmap *, struct rbmap *);
typedef struct rbmap *rbmap_t;
RB_HEAD(rbmap_tree, rbmap);
RB_PROTOTYPE2(rbmap_tree, rbmap, rbentry, rbmap_cmp, hammer_off_t);
RB_ENTRY(rbmap) rbentry;
RB_GENERATE2(rbmap_tree, rbmap, rbentry, rbmap_cmp, hammer_off_t, base);
rbmap_cmp(struct rbmap *rb1, struct rbmap *rb2)