In order to avoid reverting our fix for mount leakage in devicemapper,
add a test which checks that devicemapper's Get() and Put() cycle can
survive having a command running in an rprivate mount propagation setup
in-between. While this is quite rudimentary, it should be sufficient.
We have to skip this test for pre-3.18 kernels.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
(cherry picked from commit 1af8ea681fba1935c60c11edbbe19b894c9b286f)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
b91a1041f6