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Add IOC_OPAL_DISCOVERY ioctl to return raw discovery data to a SED Opal application. This allows the application to display drive capabilities and state. Signed-off-by: Greg Joyce <gjoyce@linux.vnet.ibm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jonathan Derrick <jonathan.derrick@linux.dev> Acked-by: Jarkko Sakkinen <jarkko@kernel.org> Link: https://lore.kernel.org/r/20230721211534.3437070-2-gjoyce@linux.vnet.ibm.com Signed-off-by: Jens Axboe <axboe@kernel.dk>