[Bug 225080] ZFS feature request: L2ARC and encryption compatibility: flag specifying L2ARC should hold data in encrypted form, if source is encrypted

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225080

--- Comment #4 from Andriy Gapon <avg at FreeBSD.org> ---
I f you are using GELI or similar, please do use it for the cache as well, just
as Conrad suggested.  OpenZFS is growing native encryption support and I am
confident that the cache encryption is properly handled there.  But you don't
have to take my word for it.  In any case, the proposed design is a big
layering violation and is much harder to implement that it may sound.  So, we
are not going to do it.
If you had a patch, then it could be a slightly different story.  But only
slightly.

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