[Bug 1055645] New: Device-mapper does not release free space from removed images

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1055645

            Bug ID: 1055645
           Summary: Device-mapper does not release free space from removed
                    images
           Product: Fedora
           Version: 20
         Component: docker-io
          Severity: high
          Assignee: lsm5(a)redhat.com
          Reporter: pmackinn(a)redhat.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: golang(a)lists.fedoraproject.org, lsm5(a)redhat.com,
                    mattdm(a)redhat.com, mgoldman(a)redhat.com,
                    skottler(a)redhat.com, vbatts(a)redhat.com



/var/lib/docker/devicemapper/devicemapper/data file can fill up and exceed
normal root partition free space even if docker images are removed.

docker-io-0.7.6-1.fc20.x86_64

Bug filed at https://github.com/dotcloud/docker/issues/3182

Mitigating docker commit at https://github.com/dotcloud/docker/pull/3256

Potentially dependent on kernel issue:
http://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/co...

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