hoid_compare
DEFINE_RB_INSDEL_FUNCS2(backoff, struct ceph_osd_backoff, begin, hoid_compare,
cmp = hoid_compare(hoid, cur->begin);
if (hoid_compare(hoid, cur->end) < 0)
cmp = hoid_compare(&hoid, begin);
return !cmp || (cmp > 0 && hoid_compare(&hoid, end) < 0);
if (hoid_compare(backoff->begin, m->begin) &&
hoid_compare(backoff->end, m->end)) {