*)
open Virt_df_gettext.Gettext
-
-(* Int64 operators for convenience. *)
-let (+^) = Int64.add
-let (-^) = Int64.sub
-let ( *^ ) = Int64.mul
-let (/^) = Int64.div
-
-let probe_swap target part_type fd start size =
- Virt_df.Swap {
- Virt_df.swap_name = s_ "Linux swap";
- swap_block_size = 4096L; (* XXX *)
- swap_blocks_total = size *^ 512L /^ 4096L;
- }
+open Virt_df
+
+let probe_swap dev =
+ (* Load the "superblock" (ie. first 0x1000 bytes). *)
+ let bits = dev#read_bitstring 0L 0x1000 in
+
+ bitmatch bits with
+ (* Actually this isn't just padding. *)
+ | padding : 8*0x1000 - 10*8 : bitstring;
+ magic : 10*8 : bitstring
+ when Bitmatch.string_of_bitstring magic = "SWAPSPACE2" ->
+ {
+ fs_name = s_ "Linux swap";
+ fs_block_size = 4096L; (* XXX *)
+ fs_blocks_total = dev#size /^ 4096L;
+
+ (* The remaining fields are ignored when fs_is_swap is true. *)
+ fs_is_swap = true;
+ fs_blocks_reserved = 0L;
+ fs_blocks_avail = 0L;
+ fs_blocks_used = 0L;
+ fs_inodes_total = 0L;
+ fs_inodes_reserved = 0L;
+ fs_inodes_avail = 0L;
+ fs_inodes_used = 0L;
+ }
+ | _ ->
+ raise Not_found (* Not Linux swapspace. *)
(* Register with main code. *)
-let () =
- Virt_df.fs_register
- [ 0x82 ] (* Partition type. *)
- probe_swap
+let () = filesystem_type_register "linux_swap" probe_swap