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This makes the device mapper not zero out blocks allocated on the thinp device. This is safe in our use case, as we access the device via a filesystem that doesn't leak any uninitialized data to userspace. This partially helps with https://github.com/dotcloud/docker/issues/3280 and should generally improve preformance on the devicemapper backend. Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)