Re: [CFT][PATCH] loopback fixes for 2.3

[Alan Cox]

> Sigh... Alan, I'm sorry, but could you try to use /dev/loop on 2.3.43? And
> watch the show. The most trivial test being: dd if=/dev/zero of=foo count=40
> losetup /dev/loop0 foo; yes|dd count=20 >/dev/loop0; losetup -d /dev/loop0;
> Now check foo. It was broken in many interesting ways.

It works fine in 2.2.x. If I tweak my data it stops working in 2.2.x. You
broke an on disk file system format, thats virtually a captal crime in my
book 8)

> The bottom line: encryption driver can trivially compensate for the change.
> So if it's a problem with on-disk format - fine, let's keep the transformation
> in the format-handling code.

Ok. But we need to be able to keep the disk format constant. And yes putting
any grunge in the crypto is a good idea