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6414 vdev_config_sync could be simpler Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Robert Mustacchi <rm@joyent.com> References: https://www.illumos.org/issues/6414 https://github.com/illumos/illumos-gate/commit/eb5bb58 Ported-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com>