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Fix case where BTRFS is not fully allocated #162

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Merged
mtelvers merged 1 commit into from
Jun 7, 2023
Merged

Fix case where BTRFS is not fully allocated #162

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20 changes: 16 additions & 4 deletions lib/btrfs_store.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -103,11 +103,23 @@ let check_kernel_version () =

let root t = t.root

module Stats = Map.Make (String)

let df t =
Lwt_process.pread ("", [| "btrfs"; "filesystem"; "df"; "-b"; t.root |]) >>= fun s ->
match ( Scanf.sscanf s "%s %s total = %Ld , used = %Ld" (fun _ _ t u -> (Int64.to_float u) /. (Int64.to_float t)) ) with
| used -> Lwt.return (100. -. (100. *. used))
| exception Scanf.Scan_failure _ -> Lwt.return 0.
Lwt_process.pread ("", [| "btrfs"; "filesystem"; "usage"; "-b"; t.root |]) >>= fun output ->
let stats =
String.split_on_char '\n' output
|> List.filter_map (fun s ->
match String.split_on_char ':' s with
| a :: b :: _ -> (
match Scanf.sscanf b " %Ld " (fun x -> x) with
| x -> Some (String.trim a, Int64.to_float x)
| (exception Scanf.Scan_failure _) | (exception End_of_file) ->
None)
| _ -> None)
|> List.fold_left (fun acc (k, v) -> Stats.add k v acc) Stats.empty
in
Lwt.return (100. -. (100. *. (Stats.find "Used" stats /. Stats.find "Device size" stats)))

let create root =
check_kernel_version () >>= fun () ->
Expand Down