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This adds the 'Reactivate' method as described in the "TCG Storage Opal SSC Feature Set: Single User Mode" document (ch. 3.1.1.1). The method enables switching an already active SED OPAL2 device, with appropriate firmware support for Single User Mode (SUM), to or from SUM. Signed-off-by: Ondrej Kozina <okozina@redhat.com> Reviewed-and-tested-by: Milan Broz <gmazyland@gmail.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>