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The controller is required to have a non-zero MNAN value if it supports ANA: If the controller supports Asymmetric Namespace Access Reporting, then this field shall be set to a non-zero value that is less than or equal to the NN value. Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Daniel Wagner <dwagner@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de>