[dm-devel] Re: [lvm-devel] dm-crypt - some info, and a few development questions

[Jon Bendtsen <jon+lvm silicide dk>]

Christophe Saout wrote:

> Would it be possible to do development of these things (especially the
> dm part) to an open place? I'm very interested in the inner workings of
> device-mapper and the new 2.5/2.6 kernel block io code.

maybe, we do need a CVS server somewhere, maybe we could get a "tree" in 
the LVM one at sistina? I doubt we can work with others, it is a study 
project we get a grade from, i would have to ask the professor.


> If I had more time and would be able to understand these things better I
> would have written some code by now (perhaps porting some of the missing
> dm targets from 2.4 to 2.5 or so), but if I can see progress step by
> step I'll perhaps be able to help. Or at least test it.
>
> The latest kernels have a somewhat modified loop.c so that it supports
> additional encryption again (cryptoloop.c), perhaps you can use some of
> that code somehow.

i dont understand what you mean encryption again?
You can always use losetup:
/dev/loop0 
file
/dev/loop1 
	/dev/loop0
/dev/loop2 
	/dev/loop1

and so on


> And, I was just wondering, would it be theoretically possible to write a
> dm target that stores data in a file, so that it replaces what the loop
> device does? Or was dm not designed for this?

i suppose it is possible to make it, i'll keep it in mind, it might be
a small project for when this is done, and then i already have the 
understanding from dm-crypt.



JonB