Increasing file space Specifying the FALLOC_FL_INSERT_RANGE flag (available since Linux ... mode in conjunction with FALLOC_FL_INSERT_RANGE . FALLOC_FL_INSERT_RANGE requires filesy…update_elem () helper will fail to insert new element when the max_entries limitloop (FLL) mode. STA_INS (read-write) Insert a leap second after the last secondloop (FLL) mode. STA_INS (read-write) Insert a leap second after the last second