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/[email protected] Reviewed-by: Bart Van Assche <[email protected]> Reviewed-by: Benjamin Block <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]> Message-Id: <[email protected]>
bignaux · Jul 21, 2021 · 7ba4679 · 7ba4679
1 parent f339c7e
commit 7ba4679
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
@@ -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;