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3090 vdev_reopen() during reguid causes vdev to be treated as corrupt 3102 vdev_uberblock_load() and vdev_validate() may read the wrong label Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Christopher Siden <chris.siden@delphix.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Approved by: Eric Schrock <Eric.Schrock@delphix.com> References: illumos/illumos-gate@dfbb943217 illumos changeset: 13777:b1e53580146d https://www.illumos.org/issues/3090 https://www.illumos.org/issues/3102 Ported-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #939