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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: 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>
This commit is contained in:
Martin K. Petersen 2021-06-08 23:39:15 -04:00
parent f339c7e491
commit 7ba46799d3
1 changed files with 7 additions and 0 deletions
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7
include/scsi/scsi_cmnd.h
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@ -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;