From: "Martin K. Petersen" <martin.petersen@oracle.com>
Date: Tue, 8 Jun 2021 23:39:15 -0400
Subject: scsi: core: Add scsi_prot_ref_tag() helper
Patch-mainline: v5.15-rc1
Git-commit: 7ba46799d34695534666a3f71a2be10ea85ece6c
References: bsc#1189392

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>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 include/scsi/scsi_cmnd.h |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -301,6 +301,13 @@ static inline sector_t scsi_get_lba(stru
 	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;