rsm_get_mapinfo
static rsm_mapinfo_t *rsm_get_mapinfo(rsmseg_t *, off_t, size_t, off_t *,
p = rsm_get_mapinfo(seg, hdl->c_off, hdl->c_len,
p = rsm_get_mapinfo(seg, off, len, &dev_offset, &cur_len);