scsi: core: Make scsi_get_lba() return the LBA

scsi_get_lba() confusingly returned the block layer sector number expressed
in units of 512 bytes. Now that we have a more aptly named
scsi_get_sector() function, make scsi_get_lba() return the actual LBA.

Link: https://lore.kernel.org/r/20210609033929.3815-13-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: <20210609033929.3815-13-martin.petersen@oracle.com>

include/scsi/scsi_cmnd.h

@@ -225,6 +225,13 @@ static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
 	return blk_rq_pos(scmd->request);
 }
 
+static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
+{
+	unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
+
+	return blk_rq_pos(scmd->request) >> shift;
+}
+
 /*
  * The operations below are hints that tell the controller driver how
  * to handle I/Os with DIF or similar types of protection information.
@@ -287,11 +294,6 @@ static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
 	return scmd->prot_type;
 }
 
-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);