Re: [PATCH 062/117] iscsi: Convert to the scsi_status union

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On 4/19/21 5:07 PM, Bart Van Assche wrote:
> An explanation of the purpose of this patch is available in the patch
> "scsi: Introduce the scsi_status union".
> 
> Cc: Lee Duncan <lduncan@xxxxxxxx>
> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
> ---
>  drivers/scsi/libiscsi.c             | 46 ++++++++++++++---------------
>  drivers/scsi/scsi_transport_iscsi.c |  2 +-
>  2 files changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
> index 4b8c9b9cf927..6bd81501fa55 100644
> --- a/drivers/scsi/libiscsi.c
> +++ b/drivers/scsi/libiscsi.c
> @@ -616,7 +616,7 @@ static void fail_scsi_task(struct iscsi_task *task, enum host_status err)
>  		state = ISCSI_TASK_ABRT_TMF;
>  
>  	sc = task->sc;
> -	sc->result = err << 16;
> +	sc->status.combined = err << 16;
>  	scsi_set_resid(sc, scsi_bufflen(sc));
>  	iscsi_complete_task(task, state);
>  	spin_unlock_bh(&conn->session->back_lock);
> @@ -814,7 +814,7 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  	iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
>  	conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
>  
> -	sc->result = (DID_OK << 16) | rhdr->cmd_status;
> +	sc->status.combined = (DID_OK << 16) | rhdr->cmd_status;
>  
>  	if (task->protected) {
>  		sector_t sector;
> @@ -829,7 +829,7 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  
>  		ascq = session->tt->check_protection(task, &sector);
>  		if (ascq) {
> -			sc->result = DRIVER_SENSE << 24 |
> +			sc->status.combined = DRIVER_SENSE << 24 |
>  				     SAM_STAT_CHECK_CONDITION;
>  			scsi_build_sense_buffer(1, sc->sense_buffer,
>  						ILLEGAL_REQUEST, 0x10, ascq);
> @@ -841,7 +841,7 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  	}
>  
>  	if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
> -		sc->result = DID_ERROR << 16;
> +		sc->status.combined = DID_ERROR << 16;
>  		goto out;
>  	}
>  
> @@ -853,7 +853,7 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  			iscsi_conn_printk(KERN_ERR,  conn,
>  					 "Got CHECK_CONDITION but invalid data "
>  					 "buffer size of %d\n", datalen);
> -			sc->result = DID_BAD_TARGET << 16;
> +			sc->status.combined = DID_BAD_TARGET << 16;
>  			goto out;
>  		}
>  
> @@ -870,7 +870,7 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  
>  	if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
>  			   ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
> -		sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
> +		sc->status.combined = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
>  	}
>  
>  	if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
> @@ -883,11 +883,11 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  			/* write side for bidi or uni-io set_resid */
>  			scsi_set_resid(sc, res_count);
>  		else
> -			sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
> +			sc->status.combined = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
>  	}
>  out:
>  	ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
> -			  sc, sc->result, task->itt);
> +			  sc, sc->status.combined, task->itt);
>  	conn->scsirsp_pdus_cnt++;
>  	iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
>  }
> @@ -912,7 +912,7 @@ iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  		return;
>  
>  	iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
> -	sc->result = (DID_OK << 16) | rhdr->cmd_status;
> +	sc->status.combined = (DID_OK << 16) | rhdr->cmd_status;
>  	conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
>  	if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
>  	                   ISCSI_FLAG_DATA_OVERFLOW)) {
> @@ -923,12 +923,12 @@ iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
>  		     res_count <= sc->sdb.length))
>  			scsi_set_resid(sc, res_count);
>  		else
> -			sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
> +			sc->status.combined = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
>  	}
>  
>  	ISCSI_DBG_SESSION(conn->session, "data in with status done "
>  			  "[sc %p res %d itt 0x%x]\n",
> -			  sc, sc->result, task->itt);
> +			  sc, sc->status.combined, task->itt);
>  	conn->scsirsp_pdus_cnt++;
>  	iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
>  }
> @@ -1678,7 +1678,7 @@ int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
>  	struct iscsi_conn *conn;
>  	struct iscsi_task *task = NULL;
>  
> -	sc->result = 0;
> +	sc->status.combined = 0;
>  	sc->SCp.ptr = NULL;
>  
>  	ihost = shost_priv(host);
> @@ -1689,7 +1689,7 @@ int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
>  
>  	reason = iscsi_session_chkready(cls_session);
>  	if (reason) {
> -		sc->result = reason;
> +		sc->status.combined = reason;
>  		goto fault;
>  	}
>  
> @@ -1708,29 +1708,29 @@ int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
>  			 */
>  			if (unlikely(system_state != SYSTEM_RUNNING)) {
>  				reason = FAILURE_SESSION_FAILED;
> -				sc->result = DID_NO_CONNECT << 16;
> +				sc->status.combined = DID_NO_CONNECT << 16;
>  				break;
>  			}
>  			fallthrough;
>  		case ISCSI_STATE_IN_RECOVERY:
>  			reason = FAILURE_SESSION_IN_RECOVERY;
> -			sc->result = DID_IMM_RETRY << 16;
> +			sc->status.combined = DID_IMM_RETRY << 16;
>  			break;
>  		case ISCSI_STATE_LOGGING_OUT:
>  			reason = FAILURE_SESSION_LOGGING_OUT;
> -			sc->result = DID_IMM_RETRY << 16;
> +			sc->status.combined = DID_IMM_RETRY << 16;
>  			break;
>  		case ISCSI_STATE_RECOVERY_FAILED:
>  			reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
> -			sc->result = DID_TRANSPORT_FAILFAST << 16;
> +			sc->status.combined = DID_TRANSPORT_FAILFAST << 16;
>  			break;
>  		case ISCSI_STATE_TERMINATE:
>  			reason = FAILURE_SESSION_TERMINATE;
> -			sc->result = DID_NO_CONNECT << 16;
> +			sc->status.combined = DID_NO_CONNECT << 16;
>  			break;
>  		default:
>  			reason = FAILURE_SESSION_FREED;
> -			sc->result = DID_NO_CONNECT << 16;
> +			sc->status.combined = DID_NO_CONNECT << 16;
>  		}
>  		goto fault;
>  	}
> @@ -1738,13 +1738,13 @@ int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
>  	conn = session->leadconn;
>  	if (!conn) {
>  		reason = FAILURE_SESSION_FREED;
> -		sc->result = DID_NO_CONNECT << 16;
> +		sc->status.combined = DID_NO_CONNECT << 16;
>  		goto fault;
>  	}
>  
>  	if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
>  		reason = FAILURE_SESSION_IN_RECOVERY;
> -		sc->result = DID_REQUEUE << 16;
> +		sc->status.combined = DID_REQUEUE << 16;
>  		goto fault;
>  	}
>  
> @@ -1766,7 +1766,7 @@ int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
>  				reason = FAILURE_OOM;
>  				goto prepd_reject;
>  			} else {
> -				sc->result = DID_ABORT << 16;
> +				sc->status.combined = DID_ABORT << 16;
>  				goto prepd_fault;
>  			}
>  		}
> @@ -2017,7 +2017,7 @@ enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
>  		 * upper layer to deal with the result.
>  		 */
>  		if (unlikely(system_state != SYSTEM_RUNNING)) {
> -			sc->result = DID_NO_CONNECT << 16;
> +			sc->status.combined = DID_NO_CONNECT << 16;
>  			ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
>  			rc = BLK_EH_DONE;
>  			goto done;
> diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
> index 4f821118ea23..b34155d285be 100644
> --- a/drivers/scsi/scsi_transport_iscsi.c
> +++ b/drivers/scsi/scsi_transport_iscsi.c
> @@ -1534,7 +1534,7 @@ static int iscsi_bsg_host_dispatch(struct bsg_job *job)
>  	/* return the errno failure code as the only status */
>  	BUG_ON(job->reply_len < sizeof(uint32_t));
>  	reply->reply_payload_rcv_len = 0;
> -	reply->result = ret;
> +	reply->status.combined = ret;
>  	job->reply_len = sizeof(uint32_t);
>  	bsg_job_done(job, ret, 0);
>  	return 0;
> 

Reviewed-by: Lee Duncan <lduncan@xxxxxxxx>
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