blob: dc976560051885099aa70e7b75821e136b0059a5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
(* '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 plugin_name = "LVM2"
let sector_size = 512
let sector_size64 = 512L
let pv_label_offset = sector_size64
(* Probe to see if it's an LVM2 PV. Look for the "LABELONE" label. *)
let rec probe_pv lvm_plugin_id dev =
try
let uuid = read_pv_label dev in
{ lvm_plugin_id = lvm_plugin_id; pv_uuid = uuid }
with _ -> raise Not_found
and read_pv_label dev =
(* Load the second sector. *)
let bits = dev#read_bitstring pv_label_offset sector_size in
(*Bitmatch.hexdump_bitstring stdout bits;*)
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" ->
Bitmatch.string_of_bitstring uuid
| _ ->
invalid_arg (sprintf "read_pv_label: %s: not an LVM2 physical volume"
dev#name)
(* We are passed a list of devices which we previously identified
* as PVs belonging to us. From these produce a list of all LVs
* (as devices) and return them. Note that we don't try to detect
* what is on these LVs - that will be done in the main code.
*)
let list_lvs devs = []
(* Register with main code. *)
let () =
lvm_type_register plugin_name probe_pv list_lvs
|
