Re: [PATCH v2 1/4] block: keyslot-manager: Introduce passthrough keyslot manager

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On Fri, Oct 16, 2020 at 08:20:44AM +0100, Christoph Hellwig wrote:
> And this just validates my argument that calling the inline crypto work
> directly from the block layer instead of just down below in blk-mq was
> wrong.  We should not require any support from stacking drivers at the
> keyslot manager level.

I'm not sure what you're referring to here; could you clarify?

It's true that device-mapper devices don't need the actual keyslot management.
But they do need the ability to expose crypto capabilities as well as a key
eviction function.  And those are currently handled by
"struct blk_keyslot_manager".  Hence the need for a "passthrough keyslot
manager" that does those other things but not the actual keyslot management.

FWIW, I suggested splitting these up, but you disagreed and said you wanted the
crypto capabilities to remain part of the blk_keyslot_manager
(https://lkml.kernel.org/linux-block/20200327170047.GA24682@xxxxxxxxxxxxx/).
If you've now changed your mind, please be clear about it.

- Eric



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