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SubjectRe: [PATCH 2/3] dm: add support for passing through inline crypto support
On Wed, Sep 09, 2020 at 11:44:21PM +0000, Satya Tangirala wrote:
> From: Eric Biggers <ebiggers@google.com>
>
> Update the device-mapper core to support exposing the inline crypto
> support of the underlying device(s) through the device-mapper device.
>
> This works by creating a "passthrough keyslot manager" for the dm
> device, which declares support for encryption settings which all
> underlying devices support. When a supported setting is used, the bio
> cloning code handles cloning the crypto context to the bios for all the
> underlying devices. When an unsupported setting is used, the blk-crypto
> fallback is used as usual.
>
> Crypto support on each underlying device is ignored unless the
> corresponding dm target opts into exposing it. This is needed because
> for inline crypto to semantically operate on the original bio, the data
> must not be transformed by the dm target. Thus, targets like dm-linear
> can expose crypto support of the underlying device, but targets like
> dm-crypt can't. (dm-crypt could use inline crypto itself, though.)
>
> When a key is evicted from the dm device, it is evicted from all
> underlying devices.
>
> Signed-off-by: Eric Biggers <ebiggers@google.com>
> Co-developed-by: Satya Tangirala <satyat@google.com>
> Signed-off-by: Satya Tangirala <satyat@google.com>

Looks good as far as Satya's changes from my original patch are concerned.

Can the device-mapper maintainers take a look at this?

- Eric

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