+ (* Some useful getter functions. If these can't get a value
+ * from the metadata or if the type is wrong they raise Not_found.
+ *)
+ let rec get_int64 field meta =
+ match List.assoc field meta with
+ | Int i -> i
+ | _ -> raise Not_found
+ and get_int field meta min max =
+ match List.assoc field meta with
+ | Int i when Int64.of_int min <= i && i <= Int64.of_int max ->
+ Int64.to_int i
+ | _ -> raise Not_found
+ and get_string field meta =
+ match List.assoc field meta with
+ | String s -> s
+ | _ -> raise Not_found
+ and get_meta field meta =
+ match List.assoc field meta with
+ | Metadata md -> md
+ | _ -> raise Not_found in
+ in
+
+ (* Scan for logical volumes. Each VG contains several LVs.
+ * This gives us a list of LVs within each VG (hence extends
+ * the vgs variable).
+ *)
+ let vgs = List.map (
+ fun (vgname, (pvuuids, vgmeta)) ->
+ let lvs =
+ try
+ let extent_size = get_int "extent_size" vgmeta 0 (256*1024) in
+ let lvs = get_meta "logical_volumes" vgmeta in
+ let lvs = List.filter_map (
+ function
+ | lvname, Metadata lvmeta ->
+ (try
+ let segment_count = get_int "segment_count" lvmeta 0 1024 in
+
+ (* Get the segments for this LV. *)
+ let segments = range 1 (segment_count+1) in
+ let segments =
+ List.map
+ (fun i -> get_meta ("segment" ^ string_of_int i) lvmeta)
+ segments in
+
+ let segments =
+ List.map (
+ fun segmeta ->
+ let start_extent =
+ get_int64 "start_extent" segmeta in
+ let extent_count =
+ get_int64 "extent_count" segmeta in
+ let segtype = get_string "type" segmeta in
+ if segtype <> "striped" then raise Not_found;
+ let stripe_count =
+ get_int "stripe_count" segmeta 0 1024 in
+ (* let stripes = in *)
+
+ (start_extent, extent_count, stripe_count)
+ ) segments in
+
+ Some (lvname, (lvmeta, segments))
+ with
+ (* Something went wrong with segments - omit this LV. *)
+ Not_found -> None)
+ | _ -> None
+ ) lvs in
+
+ lvs
+ with
+ Not_found ->
+ (* Something went wrong - assume no LVs found. *)
+ [] in
+ (vgname, (pvuuids, vgmeta, lvs))
+ ) vgs in
+
+ (* Print the LVs. *)
+ if debug then
+ List.iter (
+ fun (vgname, (pvuuids, vgmeta, lvs)) ->
+ let lvnames = List.map fst lvs in
+ eprintf "VG %s contains LVs: %s\n%!" vgname (String.concat ", " lvnames)
+ ) vgs;