(* 'df' doesn't count the restricted blocks. *)
let blocks_total = fs_blocks_total -^ fs_blocks_reserved in
let blocks_avail = fs_blocks_avail -^ fs_blocks_reserved in
let blocks_avail = if blocks_avail < 0L then 0L else blocks_avail in
(* 'df' doesn't count the restricted blocks. *)
let blocks_total = fs_blocks_total -^ fs_blocks_reserved in
let blocks_avail = fs_blocks_avail -^ fs_blocks_reserved in
let blocks_avail = if blocks_avail < 0L then 0L else blocks_avail in