Commit 7ba46799 authored by Martin K. Petersen's avatar Martin K. Petersen
Browse files

scsi: core: Add scsi_prot_ref_tag() helper 

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: default avatarBart Van Assche <bvanassche@acm.org>
Reviewed-by: default avatarBenjamin Block <bblock@linux.ibm.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Message-Id: <20210609033929.3815-2-martin.petersen@oracle.com>
parent f339c7e4

include/scsi/scsi_cmnd.h

+7 −0
Original line number Diff line number Diff line
@@ -287,6 +287,13 @@ static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) 
	return blk_rq_pos(scmd->request);

}



static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)

{

	struct request *rq = blk_mq_rq_from_pdu(scmd);



	return t10_pi_ref_tag(rq);

}



static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)

{

	return scmd->device->sector_size;