[SCSI] zfcp: Use SCSI device data zfcp_scsi_dev instead of zfcp_unit

This is the large change to switch from using the data in
zfcp_unit to zfcp_scsi_dev. Keeping everything working requires doing
the switch in one piece. To ensure that no code keeps using the data
in zfcp_unit, this patch also removes the data from zfcp_unit that is
now being replaced with zfcp_scsi_dev.

For zfcp, the scsi_device together with zfcp_scsi_dev exist from the
call of slave_alloc to the call of slave_destroy. The data in
zfcp_scsi_dev is initialized in zfcp_scsi_slave_alloc and the LUN is
opened; the final shutdown for the LUN is run from slave_destroy.

Where the scsi_device or zfcp_scsi_dev is needed, the pointer to the
scsi_device is passed as function argument and inside the function
converted to the pointer to zfcp_scsi_dev; this avoids back and forth
conversion betweeen scsi_device and zfcp_scsi_dev.

While changing the function arguments from zfcp_unit to scsi_device,
the functions names are renamed form "unit" to "lun". This is to have
a seperation between zfcp_scsi_dev/LUN and the zfcp_unit; only code
referring to the remaining configuration information in zfcp_unit
struct uses "unit".

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 140 insertions, 139 deletions

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 9d1d7d1842c..2fbd80257bc 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -86,17 +86,19 @@ static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
 	req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 }
 
-static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
-					struct zfcp_unit *unit)
+static void zfcp_fsf_access_denied_lun(struct zfcp_fsf_req *req,
+				       struct scsi_device *sdev)
 {
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
 	struct fsf_qtcb_header *header = &req->qtcb->header;
 	dev_warn(&req->adapter->ccw_device->dev,
-		 "Access denied to unit 0x%016Lx on port 0x%016Lx\n",
-		 (unsigned long long)unit->fcp_lun,
-		 (unsigned long long)unit->port->wwpn);
+		 "Access denied to LUN 0x%016Lx on port 0x%016Lx\n",
+		 (unsigned long long)zfcp_scsi_dev_lun(sdev),
+		 (unsigned long long)zfcp_sdev->port->wwpn);
 	zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
 	zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
-	zfcp_erp_unit_access_denied(unit, "fsuad_1", req);
+	zfcp_erp_lun_access_denied(sdev, "fsadl_1", req);
 	req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 }
 
@@ -811,7 +813,8 @@ out:
 
 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 {
-	struct zfcp_unit *unit = req->data;
+	struct scsi_device *sdev = req->data;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 	union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 
 	if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
@@ -820,14 +823,15 @@ static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 	switch (req->qtcb->header.fsf_status) {
 	case FSF_PORT_HANDLE_NOT_VALID:
 		if (fsq->word[0] == fsq->word[1]) {
-			zfcp_erp_adapter_reopen(unit->port->adapter, 0,
+			zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0,
 						"fsafch1", req);
 			req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		}
 		break;
 	case FSF_LUN_HANDLE_NOT_VALID:
 		if (fsq->word[0] == fsq->word[1]) {
-			zfcp_erp_port_reopen(unit->port, 0, "fsafch2", req);
+			zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fsafch2",
+					     req);
 			req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		}
 		break;
@@ -835,17 +839,17 @@ static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 		req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
 		break;
 	case FSF_PORT_BOXED:
-		zfcp_erp_port_boxed(unit->port, "fsafch3", req);
+		zfcp_erp_port_boxed(zfcp_sdev->port, "fsafch3", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_LUN_BOXED:
-		zfcp_erp_unit_boxed(unit, "fsafch4", req);
+		zfcp_erp_lun_boxed(sdev, "fsafch4", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                 break;
 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		switch (fsq->word[0]) {
 		case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
-			zfcp_fc_test_link(unit->port);
+			zfcp_fc_test_link(zfcp_sdev->port);
 			/* fall through */
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			req->status |= ZFCP_STATUS_FSFREQ_ERROR;
@@ -859,17 +863,18 @@ static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 }
 
 /**
- * zfcp_fsf_abort_fcp_command - abort running SCSI command
- * @old_req_id: unsigned long
- * @unit: pointer to struct zfcp_unit
+ * zfcp_fsf_abort_fcp_cmnd - abort running SCSI command
+ * @scmnd: The SCSI command to abort
  * Returns: pointer to struct zfcp_fsf_req
  */
 
-struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
-						struct zfcp_unit *unit)
+struct zfcp_fsf_req *zfcp_fsf_abort_fcp_cmnd(struct scsi_cmnd *scmnd)
 {
 	struct zfcp_fsf_req *req = NULL;
-	struct zfcp_qdio *qdio = unit->port->adapter->qdio;
+	struct scsi_device *sdev = scmnd->device;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio;
+	unsigned long old_req_id = (unsigned long) scmnd->host_scribble;
 
 	spin_lock_bh(&qdio->req_q_lock);
 	if (zfcp_qdio_sbal_get(qdio))
@@ -882,16 +887,16 @@ struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
 		goto out;
 	}
 
-	if (unlikely(!(atomic_read(&unit->status) &
+	if (unlikely(!(atomic_read(&zfcp_sdev->status) &
 		       ZFCP_STATUS_COMMON_UNBLOCKED)))
 		goto out_error_free;
 
 	zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
 
-	req->data = unit;
+	req->data = zfcp_sdev;
 	req->handler = zfcp_fsf_abort_fcp_command_handler;
-	req->qtcb->header.lun_handle = unit->handle;
-	req->qtcb->header.port_handle = unit->port->handle;
+	req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
+	req->qtcb->header.port_handle = zfcp_sdev->port->handle;
 	req->qtcb->bottom.support.req_handle = (u64) old_req_id;
 
 	zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
@@ -1666,7 +1671,7 @@ static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
 {
 	struct zfcp_port *port = req->data;
 	struct fsf_qtcb_header *header = &req->qtcb->header;
-	struct zfcp_unit *unit;
+	struct scsi_device *sdev;
 
 	if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 		return;
@@ -1683,11 +1688,10 @@ static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
 		/* can't use generic zfcp_erp_modify_port_status because
 		 * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
 		atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
-		read_lock(&port->unit_list_lock);
-		list_for_each_entry(unit, &port->unit_list, list)
-			atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
-					  &unit->status);
-		read_unlock(&port->unit_list_lock);
+		shost_for_each_device(sdev, port->adapter->scsi_host)
+			if (sdev_to_zfcp(sdev)->port == port)
+				atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
+						  &sdev_to_zfcp(sdev)->status);
 		zfcp_erp_port_boxed(port, "fscpph2", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
@@ -1705,11 +1709,10 @@ static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
 		 * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
 		 */
 		atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
-		read_lock(&port->unit_list_lock);
-		list_for_each_entry(unit, &port->unit_list, list)
-			atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
-					  &unit->status);
-		read_unlock(&port->unit_list_lock);
+		shost_for_each_device(sdev, port->adapter->scsi_host)
+			if (sdev_to_zfcp(sdev)->port == port)
+				atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
+						  &sdev_to_zfcp(sdev)->status);
 		break;
 	}
 }
@@ -1758,10 +1761,11 @@ out:
 	return retval;
 }
 
-static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
+static void zfcp_fsf_open_lun_handler(struct zfcp_fsf_req *req)
 {
 	struct zfcp_adapter *adapter = req->adapter;
-	struct zfcp_unit *unit = req->data;
+	struct scsi_device *sdev = req->data;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 	struct fsf_qtcb_header *header = &req->qtcb->header;
 	struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
 	struct fsf_queue_designator *queue_designator =
@@ -1773,24 +1777,24 @@ static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
 
 	atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 			  ZFCP_STATUS_COMMON_ACCESS_BOXED |
-			  ZFCP_STATUS_UNIT_SHARED |
-			  ZFCP_STATUS_UNIT_READONLY,
-			  &unit->status);
+			  ZFCP_STATUS_LUN_SHARED |
+			  ZFCP_STATUS_LUN_READONLY,
+			  &zfcp_sdev->status);
 
 	switch (header->fsf_status) {
 
 	case FSF_PORT_HANDLE_NOT_VALID:
-		zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fsouh_1", req);
+		zfcp_erp_adapter_reopen(adapter, 0, "fsouh_1", req);
 		/* fall through */
 	case FSF_LUN_ALREADY_OPEN:
 		break;
 	case FSF_ACCESS_DENIED:
-		zfcp_fsf_access_denied_unit(req, unit);
-		atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
-		atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
+		zfcp_fsf_access_denied_lun(req, sdev);
+		atomic_clear_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);
+		atomic_clear_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
 		break;
 	case FSF_PORT_BOXED:
-		zfcp_erp_port_boxed(unit->port, "fsouh_2", req);
+		zfcp_erp_port_boxed(zfcp_sdev->port, "fsouh_2", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_LUN_SHARING_VIOLATION:
@@ -1798,25 +1802,25 @@ static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
 			dev_warn(&adapter->ccw_device->dev,
 				 "LUN 0x%Lx on port 0x%Lx is already in "
 				 "use by CSS%d, MIF Image ID %x\n",
-				 (unsigned long long)unit->fcp_lun,
-				 (unsigned long long)unit->port->wwpn,
+				 (unsigned long long)zfcp_scsi_dev_lun(sdev),
+				 (unsigned long long)zfcp_sdev->port->wwpn,
 				 queue_designator->cssid,
 				 queue_designator->hla);
 		else
 			zfcp_act_eval_err(adapter,
 					  header->fsf_status_qual.word[2]);
-		zfcp_erp_unit_access_denied(unit, "fsouh_3", req);
-		atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
-		atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
+		zfcp_erp_lun_access_denied(sdev, "fsolh_3", req);
+		atomic_clear_mask(ZFCP_STATUS_LUN_SHARED, &zfcp_sdev->status);
+		atomic_clear_mask(ZFCP_STATUS_LUN_READONLY, &zfcp_sdev->status);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
 		dev_warn(&adapter->ccw_device->dev,
 			 "No handle is available for LUN "
 			 "0x%016Lx on port 0x%016Lx\n",
-			 (unsigned long long)unit->fcp_lun,
-			 (unsigned long long)unit->port->wwpn);
-		zfcp_erp_unit_failed(unit, "fsouh_4", req);
+			 (unsigned long long)zfcp_scsi_dev_lun(sdev),
+			 (unsigned long long)zfcp_sdev->port->wwpn);
+		zfcp_erp_lun_failed(sdev, "fsolh_4", req);
 		/* fall through */
 	case FSF_INVALID_COMMAND_OPTION:
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
@@ -1824,7 +1828,7 @@ static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		switch (header->fsf_status_qual.word[0]) {
 		case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
-			zfcp_fc_test_link(unit->port);
+			zfcp_fc_test_link(zfcp_sdev->port);
 			/* fall through */
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			req->status |= ZFCP_STATUS_FSFREQ_ERROR;
@@ -1833,8 +1837,8 @@ static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
 		break;
 
 	case FSF_GOOD:
-		unit->handle = header->lun_handle;
-		atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
+		zfcp_sdev->lun_handle = header->lun_handle;
+		atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status);
 
 		if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
 		    (adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
@@ -1845,39 +1849,39 @@ static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
 					FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
 
 			if (!exclusive)
-		                atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
-						&unit->status);
+				atomic_set_mask(ZFCP_STATUS_LUN_SHARED,
+						&zfcp_sdev->status);
 
 			if (!readwrite) {
-                		atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
-						&unit->status);
+				atomic_set_mask(ZFCP_STATUS_LUN_READONLY,
+						&zfcp_sdev->status);
 				dev_info(&adapter->ccw_device->dev,
 					 "SCSI device at LUN 0x%016Lx on port "
 					 "0x%016Lx opened read-only\n",
-					 (unsigned long long)unit->fcp_lun,
-					 (unsigned long long)unit->port->wwpn);
+				    (unsigned long long)zfcp_scsi_dev_lun(sdev),
+				    (unsigned long long)zfcp_sdev->port->wwpn);
         		}
 
         		if (exclusive && !readwrite) {
 				dev_err(&adapter->ccw_device->dev,
 					"Exclusive read-only access not "
-					"supported (unit 0x%016Lx, "
+					"supported (LUN 0x%016Lx, "
 					"port 0x%016Lx)\n",
-					(unsigned long long)unit->fcp_lun,
-					(unsigned long long)unit->port->wwpn);
-				zfcp_erp_unit_failed(unit, "fsouh_5", req);
+				    (unsigned long long)zfcp_scsi_dev_lun(sdev),
+				    (unsigned long long)zfcp_sdev->port->wwpn);
+				zfcp_erp_lun_failed(sdev, "fsolh_5", req);
 				req->status |= ZFCP_STATUS_FSFREQ_ERROR;
-				zfcp_erp_unit_shutdown(unit, 0, "fsouh_6", req);
+				zfcp_erp_lun_shutdown(sdev, 0, "fsolh_6", req);
         		} else if (!exclusive && readwrite) {
 				dev_err(&adapter->ccw_device->dev,
 					"Shared read-write access not "
-					"supported (unit 0x%016Lx, port "
+					"supported (LUN 0x%016Lx, port "
 					"0x%016Lx)\n",
-					(unsigned long long)unit->fcp_lun,
-					(unsigned long long)unit->port->wwpn);
-				zfcp_erp_unit_failed(unit, "fsouh_7", req);
+				    (unsigned long long)zfcp_scsi_dev_lun(sdev),
+				    (unsigned long long)zfcp_sdev->port->wwpn);
+				zfcp_erp_lun_failed(sdev, "fsolh_7", req);
 				req->status |= ZFCP_STATUS_FSFREQ_ERROR;
-				zfcp_erp_unit_shutdown(unit, 0, "fsouh_8", req);
+				zfcp_erp_lun_shutdown(sdev, 0, "fsolh_8", req);
         		}
 		}
 		break;
@@ -1885,11 +1889,11 @@ static void zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *req)
 }
 
 /**
- * zfcp_fsf_open_unit - open unit
+ * zfcp_fsf_open_lun - open LUN
  * @erp_action: pointer to struct zfcp_erp_action
  * Returns: 0 on success, error otherwise
  */
-int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
+int zfcp_fsf_open_lun(struct zfcp_erp_action *erp_action)
 {
 	struct zfcp_adapter *adapter = erp_action->adapter;
 	struct zfcp_qdio *qdio = adapter->qdio;
@@ -1913,9 +1917,9 @@ int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
 	zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
 
 	req->qtcb->header.port_handle = erp_action->port->handle;
-	req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
-	req->handler = zfcp_fsf_open_unit_handler;
-	req->data = erp_action->unit;
+	req->qtcb->bottom.support.fcp_lun = zfcp_scsi_dev_lun(erp_action->sdev);
+	req->handler = zfcp_fsf_open_lun_handler;
+	req->data = erp_action->sdev;
 	req->erp_action = erp_action;
 	erp_action->fsf_req_id = req->req_id;
 
@@ -1933,30 +1937,32 @@ out:
 	return retval;
 }
 
-static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
+static void zfcp_fsf_close_lun_handler(struct zfcp_fsf_req *req)
 {
-	struct zfcp_unit *unit = req->data;
+	struct scsi_device *sdev = req->data;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 
 	if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 		return;
 
 	switch (req->qtcb->header.fsf_status) {
 	case FSF_PORT_HANDLE_NOT_VALID:
-		zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fscuh_1", req);
+		zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0, "fscuh_1",
+					req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_LUN_HANDLE_NOT_VALID:
-		zfcp_erp_port_reopen(unit->port, 0, "fscuh_2", req);
+		zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fscuh_2", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_PORT_BOXED:
-		zfcp_erp_port_boxed(unit->port, "fscuh_3", req);
+		zfcp_erp_port_boxed(zfcp_sdev->port, "fscuh_3", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		switch (req->qtcb->header.fsf_status_qual.word[0]) {
 		case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
-			zfcp_fc_test_link(unit->port);
+			zfcp_fc_test_link(zfcp_sdev->port);
 			/* fall through */
 		case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 			req->status |= ZFCP_STATUS_FSFREQ_ERROR;
@@ -1964,19 +1970,20 @@ static void zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *req)
 		}
 		break;
 	case FSF_GOOD:
-		atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
+		atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status);
 		break;
 	}
 }
 
 /**
- * zfcp_fsf_close_unit - close zfcp unit
- * @erp_action: pointer to struct zfcp_unit
+ * zfcp_fsf_close_LUN - close LUN
+ * @erp_action: pointer to erp_action triggering the "close LUN"
  * Returns: 0 on success, error otherwise
  */
-int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
+int zfcp_fsf_close_lun(struct zfcp_erp_action *erp_action)
 {
 	struct zfcp_qdio *qdio = erp_action->adapter->qdio;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
 	struct zfcp_fsf_req *req;
 	int retval = -EIO;
 
@@ -1997,9 +2004,9 @@ int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
 	zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
 
 	req->qtcb->header.port_handle = erp_action->port->handle;
-	req->qtcb->header.lun_handle = erp_action->unit->handle;
-	req->handler = zfcp_fsf_close_unit_handler;
-	req->data = erp_action->unit;
+	req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
+	req->handler = zfcp_fsf_close_lun_handler;
+	req->data = erp_action->sdev;
 	req->erp_action = erp_action;
 	erp_action->fsf_req_id = req->req_id;
 
@@ -2025,7 +2032,7 @@ static void zfcp_fsf_req_trace(struct zfcp_fsf_req *req, struct scsi_cmnd *scsi)
 {
 	struct fsf_qual_latency_info *lat_in;
 	struct latency_cont *lat = NULL;
-	struct zfcp_unit *unit = req->unit;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scsi->device);
 	struct zfcp_blk_drv_data blktrc;
 	int ticks = req->adapter->timer_ticks;
 
@@ -2048,24 +2055,24 @@ static void zfcp_fsf_req_trace(struct zfcp_fsf_req *req, struct scsi_cmnd *scsi)
 		case FSF_DATADIR_DIF_READ_STRIP:
 		case FSF_DATADIR_DIF_READ_CONVERT:
 		case FSF_DATADIR_READ:
-			lat = &unit->latencies.read;
+			lat = &zfcp_sdev->latencies.read;
 			break;
 		case FSF_DATADIR_DIF_WRITE_INSERT:
 		case FSF_DATADIR_DIF_WRITE_CONVERT:
 		case FSF_DATADIR_WRITE:
-			lat = &unit->latencies.write;
+			lat = &zfcp_sdev->latencies.write;
 			break;
 		case FSF_DATADIR_CMND:
-			lat = &unit->latencies.cmd;
+			lat = &zfcp_sdev->latencies.cmd;
 			break;
 		}
 
 		if (lat) {
-			spin_lock(&unit->latencies.lock);
+			spin_lock(&zfcp_sdev->latencies.lock);
 			zfcp_fsf_update_lat(&lat->channel, lat_in->channel_lat);
 			zfcp_fsf_update_lat(&lat->fabric, lat_in->fabric_lat);
 			lat->counter++;
-			spin_unlock(&unit->latencies.lock);
+			spin_unlock(&zfcp_sdev->latencies.lock);
 		}
 	}
 
@@ -2141,68 +2148,66 @@ static void zfcp_fsf_send_fcp_ctm_handler(struct zfcp_fsf_req *req)
 
 static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
 {
-	struct zfcp_unit *unit;
+	struct scsi_cmnd *scmnd = req->data;
+	struct scsi_device *sdev = scmnd->device;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 	struct fsf_qtcb_header *header = &req->qtcb->header;
 
-	if (unlikely(req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
-		unit = req->data;
-	else
-		unit = req->unit;
-
 	if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 		goto skip_fsfstatus;
 
 	switch (header->fsf_status) {
 	case FSF_HANDLE_MISMATCH:
 	case FSF_PORT_HANDLE_NOT_VALID:
-		zfcp_erp_adapter_reopen(unit->port->adapter, 0, "fssfch1", req);
+		zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0, "fssfch1",
+					req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_FCPLUN_NOT_VALID:
 	case FSF_LUN_HANDLE_NOT_VALID:
-		zfcp_erp_port_reopen(unit->port, 0, "fssfch2", req);
+		zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fssfch2", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_SERVICE_CLASS_NOT_SUPPORTED:
 		zfcp_fsf_class_not_supp(req);
 		break;
 	case FSF_ACCESS_DENIED:
-		zfcp_fsf_access_denied_unit(req, unit);
+		zfcp_fsf_access_denied_lun(req, sdev);
 		break;
 	case FSF_DIRECTION_INDICATOR_NOT_VALID:
 		dev_err(&req->adapter->ccw_device->dev,
-			"Incorrect direction %d, unit 0x%016Lx on port "
+			"Incorrect direction %d, LUN 0x%016Lx on port "
 			"0x%016Lx closed\n",
 			req->qtcb->bottom.io.data_direction,
-			(unsigned long long)unit->fcp_lun,
-			(unsigned long long)unit->port->wwpn);
-		zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch3",
-					  req);
+			(unsigned long long)zfcp_scsi_dev_lun(sdev),
+			(unsigned long long)zfcp_sdev->port->wwpn);
+		zfcp_erp_adapter_shutdown(zfcp_sdev->port->adapter, 0,
+					  "fssfch3", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_CMND_LENGTH_NOT_VALID:
 		dev_err(&req->adapter->ccw_device->dev,
-			"Incorrect CDB length %d, unit 0x%016Lx on "
+			"Incorrect CDB length %d, LUN 0x%016Lx on "
 			"port 0x%016Lx closed\n",
 			req->qtcb->bottom.io.fcp_cmnd_length,
-			(unsigned long long)unit->fcp_lun,
-			(unsigned long long)unit->port->wwpn);
-		zfcp_erp_adapter_shutdown(unit->port->adapter, 0, "fssfch4",
-					  req);
+			(unsigned long long)zfcp_scsi_dev_lun(sdev),
+			(unsigned long long)zfcp_sdev->port->wwpn);
+		zfcp_erp_adapter_shutdown(zfcp_sdev->port->adapter, 0,
+					  "fssfch4", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_PORT_BOXED:
-		zfcp_erp_port_boxed(unit->port, "fssfch5", req);
+		zfcp_erp_port_boxed(zfcp_sdev->port, "fssfch5", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_LUN_BOXED:
-		zfcp_erp_unit_boxed(unit, "fssfch6", req);
+		zfcp_erp_lun_boxed(sdev, "fssfch6", req);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	case FSF_ADAPTER_STATUS_AVAILABLE:
 		if (header->fsf_status_qual.word[0] ==
 		    FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
-			zfcp_fc_test_link(unit->port);
+			zfcp_fc_test_link(zfcp_sdev->port);
 		req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 		break;
 	}
@@ -2211,8 +2216,6 @@ skip_fsfstatus:
 		zfcp_fsf_send_fcp_ctm_handler(req);
 	else {
 		zfcp_fsf_send_fcp_command_task_handler(req);
-		req->unit = NULL;
-		put_device(&unit->dev);
 	}
 }
 
@@ -2255,22 +2258,22 @@ static int zfcp_fsf_set_data_dir(struct scsi_cmnd *scsi_cmnd, u32 *data_dir)
 }
 
 /**
- * zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
- * @unit: unit where command is sent to
+ * zfcp_fsf_fcp_cmnd - initiate an FCP command (for a SCSI command)
  * @scsi_cmnd: scsi command to be sent
  */
-int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
-				   struct scsi_cmnd *scsi_cmnd)
+int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *scsi_cmnd)
 {
 	struct zfcp_fsf_req *req;
 	struct fcp_cmnd *fcp_cmnd;
 	unsigned int sbtype = SBAL_FLAGS0_TYPE_READ;
 	int real_bytes, retval = -EIO, dix_bytes = 0;
-	struct zfcp_adapter *adapter = unit->port->adapter;
+	struct scsi_device *sdev = scsi_cmnd->device;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 	struct zfcp_qdio *qdio = adapter->qdio;
 	struct fsf_qtcb_bottom_io *io;
 
-	if (unlikely(!(atomic_read(&unit->status) &
+	if (unlikely(!(atomic_read(&zfcp_sdev->status) &
 		       ZFCP_STATUS_COMMON_UNBLOCKED)))
 		return -EBUSY;
 
@@ -2295,11 +2298,10 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
 
 	io = &req->qtcb->bottom.io;
 	req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
-	req->unit = unit;
 	req->data = scsi_cmnd;
 	req->handler = zfcp_fsf_send_fcp_command_handler;
-	req->qtcb->header.lun_handle = unit->handle;
-	req->qtcb->header.port_handle = unit->port->handle;
+	req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
+	req->qtcb->header.port_handle = zfcp_sdev->port->handle;
 	io->service_class = FSF_CLASS_3;
 	io->fcp_cmnd_length = FCP_CMND_LEN;
 
@@ -2310,8 +2312,6 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
 
 	zfcp_fsf_set_data_dir(scsi_cmnd, &io->data_direction);
 
-	get_device(&unit->dev);
-
 	fcp_cmnd = (struct fcp_cmnd *) &req->qtcb->bottom.io.fcp_cmnd;
 	zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd);
 
@@ -2338,7 +2338,6 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
 	goto out;
 
 failed_scsi_cmnd:
-	put_device(&unit->dev);
 	zfcp_fsf_req_free(req);
 	scsi_cmnd->host_scribble = NULL;
 out:
@@ -2347,18 +2346,20 @@ out:
 }
 
 /**
- * zfcp_fsf_send_fcp_ctm - send SCSI task management command
- * @unit: pointer to struct zfcp_unit
+ * zfcp_fsf_fcp_task_mgmt - send SCSI task management command
+ * @scmnd: SCSI command to send the task management command for
  * @tm_flags: unsigned byte for task management flags
  * Returns: on success pointer to struct fsf_req, NULL otherwise
  */
-struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
+struct zfcp_fsf_req *zfcp_fsf_fcp_task_mgmt(struct scsi_cmnd *scmnd,
+					    u8 tm_flags)
 {
 	struct zfcp_fsf_req *req = NULL;
 	struct fcp_cmnd *fcp_cmnd;
-	struct zfcp_qdio *qdio = unit->port->adapter->qdio;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scmnd->device);
+	struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio;
 
-	if (unlikely(!(atomic_read(&unit->status) &
+	if (unlikely(!(atomic_read(&zfcp_sdev->status) &
 		       ZFCP_STATUS_COMMON_UNBLOCKED)))
 		return NULL;
 
@@ -2376,10 +2377,10 @@ struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
 	}
 
 	req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
-	req->data = unit;
+	req->data = scmnd;
 	req->handler = zfcp_fsf_send_fcp_command_handler;
-	req->qtcb->header.lun_handle = unit->handle;
-	req->qtcb->header.port_handle = unit->port->handle;
+	req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
+	req->qtcb->header.port_handle = zfcp_sdev->port->handle;
 	req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
 	req->qtcb->bottom.io.service_class = FSF_CLASS_3;
 	req->qtcb->bottom.io.fcp_cmnd_length = FCP_CMND_LEN;
@@ -2387,7 +2388,7 @@ struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
 	zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
 
 	fcp_cmnd = (struct fcp_cmnd *) &req->qtcb->bottom.io.fcp_cmnd;
-	zfcp_fc_fcp_tm(fcp_cmnd, unit->device, tm_flags);
+	zfcp_fc_fcp_tm(fcp_cmnd, scmnd->device, tm_flags);
 
 	zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT);
 	if (!zfcp_fsf_req_send(req))