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[libvirt] [PATCH] fix path to xen device statistics for newer kernels



Hi,
it seems Xen changed the paths to the block device statistics in sysfs:
from "/sys/devices/xen-backend/vbd-%d-%d/statistics/%s" to
"/sys/bus/xen-backend/devices/vbd-%d-%d/statistics/%s":

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=596004

Attached patch fixes this. O.k. to apply?
 -- Guido

>From a98e04122a6d869ea9ccaf3122c6abed73720ad7 Mon Sep 17 00:00:00 2001
From: Gerald Turner <gturner unzane com>
Date: Wed, 8 Sep 2010 21:24:44 +0200
Subject: [PATCH] Newer Xen versons moved the device statistics.

Check these locations too.
---
 src/xen/block_stats.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/src/xen/block_stats.c b/src/xen/block_stats.c
index 6e7a5c3..1d875f2 100644
--- a/src/xen/block_stats.c
+++ b/src/xen/block_stats.c
@@ -118,6 +118,18 @@ read_bd_stat (int device, int domid, const char *str)
     int64_t r;
 
     snprintf (path, sizeof path,
+              "/sys/bus/xen-backend/devices/vbd-%d-%d/statistics/%s",
+              domid, device, str);
+    r = read_stat (path);
+    if (r >= 0) return r;
+
+    snprintf (path, sizeof path,
+              "/sys/bus/xen-backend/devices/tap-%d-%d/statistics/%s",
+              domid, device, str);
+    r = read_stat (path);
+    if (r >= 0) return r;
+
+    snprintf (path, sizeof path,
               "/sys/devices/xen-backend/vbd-%d-%d/statistics/%s",
               domid, device, str);
     r = read_stat (path);
-- 
1.7.1


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