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1fd28bd8d4
When exporting ZVOLs as SCSI LUNs, by default Windows will not issue them UNMAP commands. This reduces storage efficiency in many cases. We add the SCSI_PASSTHROUGH flag to the zvol's device queue, which lets the SCSI target logic know that it can handle SCSI commands. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: John Gallagher <john.gallagher@delphix.com> Signed-off-by: Paul Dagnelie <pcd@delphix.com> Closes #8933