Re: XTS cipher mode for cluster file encryption

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Stephen Frost <sfrost(at)snowman(dot)net>
Cc: Andres Freund <andres(at)anarazel(dot)de>, Antonin Houska <ah(at)cybertec(dot)at>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, Sasasu <i(at)sasa(dot)su>
Subject: Re: XTS cipher mode for cluster file encryption
Date: 2022-02-01 18:27:03
Message-ID: Yfl7d5/
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On Tue, Feb 1, 2022 at 01:07:36PM -0500, Stephen Frost wrote:
> Well, I sent an email a week ago asking if people want to advance this
> feature forward, and so far you are the only person to reply, which I
> think means there isn't enough interest in this feature to advance it.
> This confuses me. Clearly there’s plenty of interest, but asking on hackers in
> a deep old sub thread isn’t a terribly good way to judge that.  Yet even when
> there is an active positive response, you argue that there isn’t enough.

Uh, I have been lead down the path of disinterest/confusion on this
feature enough that I am looking for positive feedback on every new step
so I don't get stuck out in front with insufficient support. Yes, only
one person replying is enough for me to say there isn't interest. I
guess I now have two. My email was short and ended with a question so I
thought the people interested in the steps I suggested would give some
kind of feedback --- I certainly try to reply to all emails on this

> In general, I agree that the items you laid out are what the next steps are. 
> There are patches for some of those items already too and some of them, such as
> consolidating the temporary file access, are beneficial even without the
> potential to use them for encryption.  

Great. I can update my patch for July consideration.

> Instead of again asking if people want this feature (many, many, many do), I’d
> encourage Antonin to start a new thread with the patch to do the temporary file
> access consolidation which then provides a buffered access and reduces the
> number of syscalls and work towards getting that committed, ideally as part of
> this release.

Yes, agreed.

Bruce Momjian <bruce(at)momjian(dot)us>

If only the physical world exists, free will is an illusion.

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