From cd3b21408fe8bbb64bf17a51b9830ca1e07a5d3e Mon Sep 17 00:00:00 2001
From: Keir Fraser <keir.fraser@citrix.com>
Date: Fri, 18 Jul 2008 12:44:58 +0100
Subject: [PATCH] Check phy: block device existence

Signed-off-by: Masaki Kanno <kanno.masaki@jp.fujitsu.com>
---
 tools/examples/block | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/examples/block b/tools/examples/block
index 56c26789a5..8c61744c83 100644
--- a/tools/examples/block
+++ b/tools/examples/block
@@ -209,6 +209,14 @@ case "$command" in
         FRONTEND_ID=$(xenstore_read "$XENBUS_PATH/frontend-id")
         FRONTEND_UUID=$(xenstore_read_default \
             "/local/domain/$FRONTEND_ID/vm" 'unknown')
+
+        if [ -L "$dev" ]
+        then
+          dev=$(readlink -f "$dev") || fatal "$dev link does not exist."
+        fi
+        test -e "$dev" || fatal "$dev does not exist."
+        test -b "$dev" || fatal "$dev is not a block device."
+
         claim_lock "block"
         check_device_sharing "$dev" "$mode"
 	write_dev "$dev"
-- 
2.30.2