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5368 ARC should cache more metadata Reviewed by: Alex Reece <alex.reece@delphix.com> Reviewed by: Christopher Siden <christopher.siden@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Richard Elling <richard.elling@richardelling.com> Approved by: Dan McDonald <danmcd@omniti.com> References: https://www.illumos.org/issues/5368 https://github.com/illumos/illumos-gate/commit/3a5286a Porting Notes: The vast majority of this patch was already merged in the context of the 06358ea changes. This is just a small hunk which was missed. Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>