path_id: support identification of Xen virtual block devices

diff --git a/extras/path_id/path_id b/extras/path_id/path_id
index d21dea70117b8fb91fe28fc80f42d504aedc73af..7b4973fa038a4df73f80b5e3258891430ed9a792 100755 (executable)
--- a/extras/path_id/path_id
+++ b/extras/path_id/path_id
@@ -129,6 +129,30 @@ handle_platform () {
        RESULT=0
 }
 
+handle_xen () {
+       local DEV=$1
+       cd -P $1
+       vbd_id=${DEV##*/}
+       host_dev_path=$DEV
+       while [ ! -z "$host_dev_path" ] ; do
+               case "$host_dev_path" in
+                       */vbd*)
+                               host_dev_path=${host_dev_path%/*}
+                               ;;
+                       *)
+                               break
+                               ;;
+               esac
+       done
+       if [ "$d" ]; then
+               d="xen-$vbd_id-$d"
+       else
+               d="xen-$vbd_id"
+       fi
+       D="$host_dev_path"
+       RESULT=0
+}
+
 handle_serio () {
        local DEV=$1
        cd -P $1
@@ -532,6 +556,9 @@ handle_device () {
                        */platform/*)
                                handle_platform "$D"
                                ;;
+                       */vbd-[0-9]*)
+                               handle_xen "$D"
+                               ;;
                        */devices)
                                D=
                                ;;