[dm-devel] Re: [lvm-devel] dm-crypt - some info, and a few development questions
Joe Thornber
thornber at sistina.com
Thu Jul 17 12:43:15 UTC 2003
On Thu, Jul 17, 2003 at 07:32:33PM +0200, Jon Bendtsen wrote:
> to this mailing list, or the linux kernel development one ?
This list is probably best until you have working code.
> > Spend a day playing with dmsetup, and make sure you really understand
> > how to write target types. The best way to learn is to try and write
> > a trivial target type, eg. a 'reverse' target that divides the device
> > into chunks and then reverses their order, ie. the first logical
> chunk > is
> > stored in the last logical chunk of the device. This should only take
> > you ~150 lines of code (start with dm-linear.c and modify).
>
> hmm, maybe the map into a file is a more trivial target ?
No, not by a long way.
> Would it be an easy target to write, such that i could play with a
> dm-loop target before making the dm-crypt?
I wouldn't recommend this unless you are already familiar with the
VFS; I would expect there to be subtle deadlock issues. I don't think
it helps your development path.
- Joe
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