From bb0788a39d9b8675db60a61ecd2baebfdfb5ca10 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Thu, 1 Jan 1970 00:00:00 +0000
Subject: [PATCH] LVM2 PV detection.
---
virt-df/virt_df_lvm2.ml | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/virt-df/virt_df_lvm2.ml b/virt-df/virt_df_lvm2.ml
index 4247dc3..9355597 100644
--- a/virt-df/virt_df_lvm2.ml
+++ b/virt-df/virt_df_lvm2.ml
@@ -29,6 +29,7 @@ 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 dev =
try ignore (read_pv_label dev); true
with _ -> false
@@ -37,6 +38,8 @@ 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;
@@ -49,6 +52,11 @@ and read_pv_label dev =
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. *)
--
1.8.3.1