[Bug 234705] zpool initialize does not BIO_DELETE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234705

--- Comment #3 from Warner Losh <imp at FreeBSD.org> ---
(In reply to Warner Losh from comment #2)
Which is a long way of saying BIO_DELETE is our deallocation abstraction, and
we should use it, but it is (in FreeBSD) non-deterministic. We don't have a way
to 'widen' the abstraction to one of the three possible values (0, f's or last)
today. If ZFS cares what the data is, it should write the data. If it doesn't
care, it should just use TRIM on devices that support it. I'm not sure how
useful widening the abstraction would be, though, given the hair involved to
make it work and the current lack of a real use case.

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