[Bug 234705] zpool initialize does not BIO_DELETE

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

Warner Losh <imp at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |imp at FreeBSD.org

--- Comment #2 from Warner Losh <imp at FreeBSD.org> ---
These days, BIO_DELETE is almost always a win. Writing zeros is a big lose
often (though if the lower-layers implement a special WRITE ZEROS command,
there might be some cases where that's useful: we currently do not). I doubt
BOTH are ever anything but extra work. I would argue, however, that we should
think carefully here. The difference between DSM Deallocate and WRITE ZEROS +
Deallocate flag (for those nvme drives that support it) is very small (trimmed
blocks can return a variety of things depending: 0, ff or last written data)...

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