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We are about to remove the request pointer from struct scsi_cmnd and that will complicate getting to the ref_tag via t10_pi_ref_tag() in the various drivers. Introduce a helper function to retrieve the reference tag so drivers will not have to worry about the details. Link: https://lore.kernel.org/r/20210609033929.3815-2-martin.petersen@oracle.com Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Message-Id: <20210609033929.3815-2-martin.petersen@oracle.com>