Re: loop subsystem corrupted after mounting multiple btrfs sub-volumes

From: Al Viro
Date: Fri Feb 26 2016 - 16:45:25 EST

On Fri, Feb 26, 2016 at 10:36:50PM +0100, Stanislav Brabec wrote:

> It should definitely report error whenever trying -oloop on top of
> anything else than a file. Or at least a warning.
> Well, even losetup should report a warning.

Keep in mind that with crypto in the game it just might be useful to have
loop-over-loop - it might be _not_ a no-op (hell, you might have two
layers of encryption - not the smartest thing to do, but if that's what
got dumped on your lap, you deal with what you've got). So such warnings
shouldn't be hard errors.