Don't zero out thin provisioned LV's on delete

Thin provisioned LV's don't need secure delete to protect
from data leakage.  Also, zeroing these out kinda defeats
the purpose of using thing provisioning.

This patch add a check for the lvm type and if it's thin simply
returns from the lvm.clear_volume() method.

Change-Id: Ie6764209018152565295291efc6fbba553698ae6
Closes-Bug: #1240299

diff --git a/cinder/volume/drivers/lvm.py b/cinder/volume/drivers/lvm.py
index 3b48840c3e56a00839be238c6b44dbbb8de80dc9..75b0d3b4aaf057de998f37f4999100a53f4c8dc6 100644 (file)
--- a/cinder/volume/drivers/lvm.py
+++ b/cinder/volume/drivers/lvm.py
@@ -197,10 +197,13 @@ class LVMVolumeDriver(driver.VolumeDriver):
     def clear_volume(self, volume, is_snapshot=False):
         """unprovision old volumes to prevent data leaking between users."""
 
-        if self.configuration.volume_clear == 'none':
+        # NOTE(jdg): Don't write the blocks of thin provisioned
+        # volumes
+        if self.configuration.volume_clear == 'none' or \
+                self.configuration.lvm_type == 'thin':
             return
 
-        if is_snapshot and not self.configuration.lvm_type == 'thin':
+        if is_snapshot:
             # if the volume to be cleared is a snapshot of another volume
             # we need to clear out the volume using the -cow instead of the
             # directly volume path.  We need to skip this if we are using