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(* 'df' command for virtual domains.
(C) Copyright 2007 Richard W.M. Jones, Red Hat Inc.
http://libvirt.org/
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Support for LVM2 PVs.
*)
open Printf
open Virt_df_gettext.Gettext
open Virt_df
let sector_size = 512
let sector_size64 = 512L
let pv_label_offset = sector_size64
let rec probe_pv dev =
try ignore (read_pv_label dev); true
with _ -> false
and read_pv_label dev =
(* Load the second sector. *)
let bits = dev#read_bitstring pv_label_offset sector_size in
bitmatch bits with
| labelone : 8*8 : bitstring; (* "LABELONE" *)
padding : 16*8 : bitstring;
lvm2_ver : 8*8 : bitstring; (* "LVM2 001" *)
uuid : 32*8 : bitstring (* UUID *)
when Bitmatch.string_of_bitstring labelone = "LABELONE" &&
Bitmatch.string_of_bitstring lvm2_ver = "LVM2 001" ->
uuid
| _ ->
invalid_arg (sprintf "read_pv_label: %s: not an LVM2 physical volume"
dev#name)
let list_lvs devs = []
(* Register with main code. *)
let () =
lvm_type_register "LVM2" probe_pv list_lvs
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