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Alexander Motin authored
Previous code tried to keep prefetch streams while moving dnode. But it was at least not updating per-stream zs_fetchback pointers, causing use-after-free on next access. Instead of that I see much easier and cleaner to just drop old prefetch state and start new from scratch. Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Igor Kozhukhov <igor@dilos.org> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #11936 Closes #11998