linux-ext4 - Re: [PATCH v7 05/16] fscrypt: refactor v1 policy key setup into keysetup

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Message-ID: <20190729193740.GD169027@gmail.com>
Date:   Mon, 29 Jul 2019 12:37:42 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, linux-api@...r.kernel.org,
        linux-crypto@...r.kernel.org, keyrings@...r.kernel.org,
        Paul Crowley <paulcrowley@...gle.com>,
        Satya Tangirala <satyat@...gle.com>
Subject: Re: [PATCH v7 05/16] fscrypt: refactor v1 policy key setup into
 keysetup_legacy.c

Hi Ted, thanks for the review!

On Sun, Jul 28, 2019 at 11:40:32AM -0400, Theodore Y. Ts'o wrote:
> On Fri, Jul 26, 2019 at 03:41:30PM -0700, Eric Biggers wrote:
> > From: Eric Biggers <ebiggers@...gle.com>
> > 
> > In preparation for introducing v2 encryption policies which will find
> > and derive encryption keys differently from the current v1 encryption
> > policies, refactor the v1 policy-specific key setup code from keyinfo.c
> > into keysetup_legacy.c.  Then rename keyinfo.c to keysetup.c.
> 
> I'd use keysetup_v1.c, myself.  We can hope that we've gotten it right
> with v2 and we'll never need to do another version, but *something* is
> going to come up eventually which will require a v3 keysetup , whether
> it's post-quantuum cryptography or something else we can't anticipate
> right now.
> 
> For an example of the confusion that can result, one good example is
> in the fs/quota subsystem, where QFMT_VFS_OLD, QFMT_VFS_V0, and
> QFMT_VFS_V1 maps to quota_v1 and quota_v2 in an amusing and
> non-obvious way.  (Go ahead, try to guess before you go look at the
> code.  :-)
> 
> Other than that, looks good.  We can always move code around or rename
> files in the future, so I'm not going to insist on doing it now (but
> it would be my preference).
> 
> Reviewed-by: Theodore Ts'o <tytso@....edu>
> 

Agreed, I'll call it keysetup_v1.c instead.

- Eric