From 41808571f148c6d3720bcf09d997fe932d259f6c Mon Sep 17 00:00:00 2001
From: Pádraig Brady <pbrady@redhat.com>
Date: Wed, 19 Sep 2012 23:52:22 +0100
Subject: optimize slightly device lookup with LXC umounts

Only canonicalize the path once, rather than for
each entry in /proc/mounts.

Change-Id: I6e582b44f171a1c4cc151d615e9dcfae1e590a53
Reported-by: Kevin L. Mitchell
---
 nova/virt/disk/api.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'nova')

diff --git a/nova/virt/disk/api.py b/nova/virt/disk/api.py
index 16bd9fe04..0cddcfa69 100644
--- a/nova/virt/disk/api.py
+++ b/nova/virt/disk/api.py
@@ -208,10 +208,11 @@ class _DiskImage(object):
     @staticmethod
     def _device_for_path(path):
         device = None
+        path = os.path.realpath(path)
         with open("/proc/mounts", 'r') as ifp:
             for line in ifp:
                 fields = line.split()
-                if fields[1] == os.path.realpath(path):
+                if fields[1] == path:
                     device = fields[0]
                     break
         return device
-- 
cgit