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  • In your first diagram, would it be acceptable to replace the "Files -> Journaled Filesystem" with "Files -> Non-journaled filesystem", while keeping "Journaled filesystem -> Physical device"? If yes, that would mean I can keep the underlying ext4 journaling file system which is already in place for my partitions, as long as the file which houses the encrypted volume doesn't have another journaling file system. I definitely wouldn't want journaling at 2 layers anyway, I'm just trying to understand where the journaling is allowed if it's allowed once.
    – Mike Rowave
    Commented Apr 3, 2011 at 23:23
  • Yes. As they say: Don't use a journaling file system on top of file backed loop device. which means you can use it for the filesystem holding the file backed loop device.
    – Majenko
    Commented Apr 4, 2011 at 7:51
  • Thanks. My previous confusion was because I was unclear on what "on top of" meant, as it can mean different things depending on how one visualizes the file systems.
    – Mike Rowave
    Commented Apr 4, 2011 at 9:02
  • The easiest way of visualizing it is to imagine the physical disk is at the bottom of the stack and you, the user, are at the top.
    – Majenko
    Commented Apr 4, 2011 at 9:05