Revert "Implement _umount() for cases where filesystem umount doesn't work"
This reverts commit 89e9960e34737c027d7fb0516d7183dc0a37f391.
Revert "Implement _umount() for cases where filesystem umount doesn't work"
This reverts commit 89e9960e34737c027d7fb0516d7183dc0a37f391.