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5946 zfs_ioc_space_snaps must check that firstsnap and lastsnap refer to snapshots 5945 zfs_ioc_send_space must ensure that fromsnap refers to a snapshot Reviewed by: Steven Hartland <killing@multiplay.co.uk> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Gordon Ross <gordon.ross@nexenta.com> illumos/illumos-gate@24218bebb4 Note that the upstream commit is modified during MFV: in the upstream the check is done by inspecting ds_is_snapshot field while in FreeBSD we call dsl_dataset_is_snapshot(). This is because illumos/illumos-gate@bc9014e6a8 (r277428 in vendor-sys/illumos) is not MFV-ed yet. MFC after: 10 days
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