linux-ext4 - Re: [PATCH v9 01/11] block: Keyslot Manager for Inline Encryption

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Date:   Fri, 27 Mar 2020 10:00:47 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Satya Tangirala <satyat@...gle.com>, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-fscrypt@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
        Barani Muthukumaran <bmuthuku@....qualcomm.com>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        Kim Boojin <boojin.kim@...sung.com>
Subject: Re: [PATCH v9 01/11] block: Keyslot Manager for Inline Encryption

On Wed, Mar 25, 2020 at 11:22:13PM -0700, Eric Biggers wrote:
> > +#ifdef CONFIG_BLK_INLINE_ENCRYPTION
> > +	/* Inline crypto capabilities */
> > +	struct blk_keyslot_manager *ksm;
> > +#endif
> 
> I do still wonder whether the concept of inline crypto support should be more
> separated from keyslot management, to be better prepared for device-mapper
> passthrough support and for hardware that accepts keys directly.  (Such hardware
> exists, though I'm not sure support for it will be upstreamed.)  For example,
> the crypto capabilities could be stored in a 'struct blk_crypto_capabilities'
> rather than in 'struct blk_keyslot_manager', and the latter could be optional.
> 
> What you have now is fine for the functionality in the current patchset though,
> so I'm not really complaining.  Just something to think about.

I'd rather keep things simple (aka as-is) for now.  If needed we can
change it. I doubt we'll even have a handful drivers with inline
crypto in the next years..