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3894 zfs should not allow snapshot of inconsistent dataset Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Gordon Ross <gwr@nexenta.com> References: https://www.illumos.org/issues/3894 illumos/illumos-gate@ca48f36f20 Ported-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1775