[PATCH] Fix existing size calculation for NTFS (#520627)

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Rounding errors when computing the existing size of NTFS volumes.
---
 storage/formats/fs.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/storage/formats/fs.py b/storage/formats/fs.py
index a78ecb2..c549942 100644
--- a/storage/formats/fs.py
+++ b/storage/formats/fs.py
@@ -27,6 +27,7 @@
         - migration
         - bug 472127: allow creation of tmpfs filesystems (/tmp, /var/tmp, &c)
 """
+import math
 import os
 import tempfile
 import isys
@@ -262,7 +263,7 @@ class FS(DeviceFormat):
                     size *= value
 
                 # report current size as megabytes
-                size = size / 1024.0 / 1024.0
+                size = math.floor(size / 1024.0 / 1024.0)
             except Exception as e:
                 log.error("failed to obtain size of filesystem on %s: %s"
                           % (self.device, e))
-- 
1.6.2.5

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