scsi: core: Add scsi_prot_ref_tag() helper

[ Upstream commit 7ba46799d34695534666a3f71a2be10ea85ece6c ]

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>
Stable-dep-of: 066c5b46b6ea ("scsi: core: Always send batch on reset or error handling command")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index b1c9b52876f3ca1a61d726390bdf654eb29f7f22..6630464635330c2c032cd7cfb925fea1a410c1eb 100644 (file)
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -291,6 +291,13 @@ 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;