Revert "Implement _umount() for cases where filesystem umount doesn't work"
This reverts commit be1eff2b4ba57c8f97128dacefb5271549c16d51.
Revert "Implement _umount() for cases where filesystem umount doesn't work"
This reverts commit be1eff2b4ba57c8f97128dacefb5271549c16d51.