1 (* 'df' command for virtual domains.
3 (C) Copyright 2007 Richard W.M. Jones, Red Hat Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 open Virt_df_gettext.Gettext
27 let plugin_name = "LVM2"
30 let sector_size64 = 512L
32 let pv_label_offset = sector_size64
34 (* Probe to see if it's an LVM2 PV. Look for the "LABELONE" label. *)
35 let rec probe_pv lvm_plugin_id dev =
37 let uuid = read_pv_label dev in
38 { lvm_plugin_id = lvm_plugin_id; pv_uuid = uuid }
39 with _ -> raise Not_found
41 and read_pv_label dev =
42 (* Load the second sector. *)
43 let bits = dev#read_bitstring pv_label_offset sector_size in
45 (*Bitmatch.hexdump_bitstring stdout bits;*)
48 | labelone : 8*8 : bitstring; (* "LABELONE" *)
49 padding : 16*8 : bitstring;
50 lvm2_ver : 8*8 : bitstring; (* "LVM2 001" *)
51 uuid : 32*8 : bitstring (* UUID *)
52 when Bitmatch.string_of_bitstring labelone = "LABELONE" &&
53 Bitmatch.string_of_bitstring lvm2_ver = "LVM2 001" ->
54 Bitmatch.string_of_bitstring uuid
56 invalid_arg (sprintf "read_pv_label: %s: not an LVM2 physical volume"
59 (* We are passed a list of devices which we previously identified
60 * as PVs belonging to us. From these produce a list of all LVs
61 * (as devices) and return them. Note that we don't try to detect
62 * what is on these LVs - that will be done in the main code.
64 let list_lvs devs = []
66 (* Register with main code. *)
68 lvm_type_register plugin_name probe_pv list_lvs