[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, 194 insertions, 175 deletions

diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index 50514b4c8732..734fc838931f 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -30,12 +30,12 @@ enum zfcp_erp_steps {
 	ZFCP_ERP_STEP_PHYS_PORT_CLOSING	= 0x0010,
 	ZFCP_ERP_STEP_PORT_CLOSING	= 0x0100,
 	ZFCP_ERP_STEP_PORT_OPENING	= 0x0800,
-	ZFCP_ERP_STEP_UNIT_CLOSING	= 0x1000,
-	ZFCP_ERP_STEP_UNIT_OPENING	= 0x2000,
+	ZFCP_ERP_STEP_LUN_CLOSING	= 0x1000,
+	ZFCP_ERP_STEP_LUN_OPENING	= 0x2000,
 };
 
 enum zfcp_erp_act_type {
-	ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
+	ZFCP_ERP_ACTION_REOPEN_LUN         = 1,
 	ZFCP_ERP_ACTION_REOPEN_PORT	   = 2,
 	ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
 	ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
@@ -89,24 +89,24 @@ static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
 		zfcp_erp_action_ready(act);
 }
 
-static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
+static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev)
 {
-	if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
-		zfcp_erp_action_dismiss(&unit->erp_action);
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
+		zfcp_erp_action_dismiss(&zfcp_sdev->erp_action);
 }
 
 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
 {
-	struct zfcp_unit *unit;
+	struct scsi_device *sdev;
 
 	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 		zfcp_erp_action_dismiss(&port->erp_action);
-	else {
-		read_lock(&port->unit_list_lock);
-		list_for_each_entry(unit, &port->unit_list, list)
-			zfcp_erp_action_dismiss_unit(unit);
-		read_unlock(&port->unit_list_lock);
-	}
+	else
+		shost_for_each_device(sdev, port->adapter->scsi_host)
+			if (sdev_to_zfcp(sdev)->port == port)
+				zfcp_erp_action_dismiss_lun(sdev);
 }
 
 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
@@ -125,15 +125,17 @@ static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 
 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 				 struct zfcp_port *port,
-				 struct zfcp_unit *unit)
+				 struct scsi_device *sdev)
 {
 	int need = want;
-	int u_status, p_status, a_status;
+	int l_status, p_status, a_status;
+	struct zfcp_scsi_dev *zfcp_sdev;
 
 	switch (want) {
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
-		u_status = atomic_read(&unit->status);
-		if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(sdev);
+		l_status = atomic_read(&zfcp_sdev->status);
+		if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 			return 0;
 		p_status = atomic_read(&port->status);
 		if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
@@ -173,18 +175,22 @@ static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
 						  struct zfcp_adapter *adapter,
 						  struct zfcp_port *port,
-						  struct zfcp_unit *unit)
+						  struct scsi_device *sdev)
 {
 	struct zfcp_erp_action *erp_action;
+	struct zfcp_scsi_dev *zfcp_sdev;
 
 	switch (need) {
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(sdev);
 		if (!(act_status & ZFCP_STATUS_ERP_NO_REF))
-			if (!get_device(&unit->dev))
+			if (scsi_device_get(sdev))
 				return NULL;
-		atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
-		erp_action = &unit->erp_action;
-		if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
+		atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
+				&zfcp_sdev->status);
+		erp_action = &zfcp_sdev->erp_action;
+		if (!(atomic_read(&zfcp_sdev->status) &
+		      ZFCP_STATUS_COMMON_RUNNING))
 			act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
 		break;
 
@@ -216,7 +222,7 @@ static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
 	memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 	erp_action->adapter = adapter;
 	erp_action->port = port;
-	erp_action->unit = unit;
+	erp_action->sdev = sdev;
 	erp_action->action = need;
 	erp_action->status = act_status;
 
@@ -225,8 +231,8 @@ static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
 
 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 				   struct zfcp_port *port,
-				   struct zfcp_unit *unit, char *id, void *ref,
-				   u32 act_status)
+				   struct scsi_device *sdev,
+				   char *id, void *ref, u32 act_status)
 {
 	int retval = 1, need;
 	struct zfcp_erp_action *act = NULL;
@@ -234,11 +240,11 @@ static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 	if (!adapter->erp_thread)
 		return -EIO;
 
-	need = zfcp_erp_required_act(want, adapter, port, unit);
+	need = zfcp_erp_required_act(want, adapter, port, sdev);
 	if (!need)
 		goto out;
 
-	act = zfcp_erp_setup_act(need, act_status, adapter, port, unit);
+	act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev);
 	if (!act)
 		goto out;
 	atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
@@ -248,7 +254,7 @@ static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 	zfcp_dbf_rec_thread("eracte1", adapter->dbf);
 	retval = 0;
  out:
-	zfcp_dbf_rec_trigger(id, ref, want, need, act, adapter, port, unit);
+	zfcp_dbf_rec_trigger(id, ref, want, need, act, adapter, port, sdev);
 	return retval;
 }
 
@@ -392,77 +398,81 @@ int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 	return retval;
 }
 
-static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
+static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask)
 {
-	zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
-				    ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
-				    ZFCP_CLEAR);
+	zfcp_erp_modify_lun_status(sdev, "erlblk1", NULL,
+				   ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
+				   ZFCP_CLEAR);
 }
 
-static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
-				  void *ref, u32 act_status)
+static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
+				 void *ref, u32 act_status)
 {
-	struct zfcp_adapter *adapter = unit->port->adapter;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 
-	zfcp_erp_unit_block(unit, clear);
+	zfcp_erp_lun_block(sdev, clear);
 
-	if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
+	if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 		return;
 
-	zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
-				adapter, unit->port, unit, id, ref, act_status);
+	zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
+				zfcp_sdev->port, sdev, id, ref, act_status);
 }
 
 /**
- * zfcp_erp_unit_reopen - initiate reopen of a unit
- * @unit: unit to be reopened
- * @clear_mask: specifies flags in unit status to be cleared
+ * zfcp_erp_lun_reopen - initiate reopen of a LUN
+ * @sdev: SCSI device / LUN to be reopened
+ * @clear_mask: specifies flags in LUN status to be cleared
  * Return: 0 on success, < 0 on error
  */
-void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
-			  void *ref)
+void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
+			 void *ref)
 {
 	unsigned long flags;
-	struct zfcp_port *port = unit->port;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_port *port = zfcp_sdev->port;
 	struct zfcp_adapter *adapter = port->adapter;
 
 	write_lock_irqsave(&adapter->erp_lock, flags);
-	_zfcp_erp_unit_reopen(unit, clear, id, ref, 0);
+	_zfcp_erp_lun_reopen(sdev, clear, id, ref, 0);
 	write_unlock_irqrestore(&adapter->erp_lock, flags);
 }
 
 /**
- * zfcp_erp_unit_shutdown - Shutdown unit
- * @unit: Unit to shut down.
+ * zfcp_erp_lun_shutdown - Shutdown LUN
+ * @sdev: SCSI device / LUN to shut down.
  * @clear: Status flags to clear.
  * @id: Id for debug trace event.
  * @ref: Reference for debug trace event.
  */
-void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
-			    void *ref)
+void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id,
+			   void *ref)
 {
 	int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
-	zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
+	zfcp_erp_lun_reopen(sdev, clear | flags, id, ref);
 }
 
 /**
- * zfcp_erp_unit_shutdown_wait - Shutdown unit and wait for erp completion
- * @unit: Unit to shut down.
+ * zfcp_erp_lun_shutdown_wait - Shutdown LUN and wait for erp completion
+ * @sdev: SCSI device / LUN to shut down.
  * @id: Id for debug trace event.
  *
- * Do not acquire a reference for the unit when creating the ERP
+ * Do not acquire a reference for the LUN when creating the ERP
  * action. It is safe, because this function waits for the ERP to
- * complete first.
+ * complete first. This allows to shutdown the LUN, even when the SCSI
+ * device is in the state SDEV_DEL when scsi_device_get will fail.
  */
-void zfcp_erp_unit_shutdown_wait(struct zfcp_unit *unit, char *id)
+void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
 {
 	unsigned long flags;
-	struct zfcp_port *port = unit->port;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_port *port = zfcp_sdev->port;
 	struct zfcp_adapter *adapter = port->adapter;
 	int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 
 	write_lock_irqsave(&adapter->erp_lock, flags);
-	_zfcp_erp_unit_reopen(unit, clear, id, NULL, ZFCP_STATUS_ERP_NO_REF);
+	_zfcp_erp_lun_reopen(sdev, clear, id, NULL, ZFCP_STATUS_ERP_NO_REF);
 	write_unlock_irqrestore(&adapter->erp_lock, flags);
 
 	zfcp_erp_wait(adapter);
@@ -492,11 +502,13 @@ static void zfcp_erp_port_unblock(struct zfcp_port *port)
 	atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 }
 
-static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
+static void zfcp_erp_lun_unblock(struct scsi_device *sdev)
 {
-	if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
-		zfcp_dbf_rec_unit("eruubl1", NULL, unit);
-	atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status))
+		zfcp_dbf_rec_lun("erlubl1", NULL, sdev);
+	atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status);
 }
 
 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
@@ -584,15 +596,14 @@ static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 	read_unlock(&adapter->port_list_lock);
 }
 
-static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
-				      char *id, void *ref)
+static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
+				     char *id, void *ref)
 {
-	struct zfcp_unit *unit;
+	struct scsi_device *sdev;
 
-	read_lock(&port->unit_list_lock);
-	list_for_each_entry(unit, &port->unit_list, list)
-		_zfcp_erp_unit_reopen(unit, clear, id, ref, 0);
-	read_unlock(&port->unit_list_lock);
+	shost_for_each_device(sdev, port->adapter->scsi_host)
+		if (sdev_to_zfcp(sdev)->port == port)
+			_zfcp_erp_lun_reopen(sdev, clear, id, ref, 0);
 }
 
 static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
@@ -607,8 +618,8 @@ static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 	case ZFCP_ERP_ACTION_REOPEN_PORT:
 		_zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
 		break;
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
-		_zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL, 0);
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		_zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", NULL, 0);
 		break;
 	}
 }
@@ -623,7 +634,7 @@ static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 		_zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
 		break;
 	case ZFCP_ERP_ACTION_REOPEN_PORT:
-		_zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
+		_zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3", NULL);
 		break;
 	}
 }
@@ -767,7 +778,7 @@ static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 	zfcp_fsf_req_dismiss_all(adapter);
 	adapter->fsf_req_seq_no = 0;
 	zfcp_fc_wka_ports_force_offline(adapter->gs);
-	/* all ports and units are closed */
+	/* all ports and LUNs are closed */
 	zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 				       ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 
@@ -958,82 +969,86 @@ close_init_done:
 	return zfcp_erp_port_strategy_open_common(erp_action);
 }
 
-static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
+static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev)
 {
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
 	atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
-			  ZFCP_STATUS_UNIT_SHARED |
-			  ZFCP_STATUS_UNIT_READONLY,
-			  &unit->status);
+			  ZFCP_STATUS_LUN_SHARED | ZFCP_STATUS_LUN_READONLY,
+			  &zfcp_sdev->status);
 }
 
-static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
+static int zfcp_erp_lun_strategy_close(struct zfcp_erp_action *erp_action)
 {
-	int retval = zfcp_fsf_close_unit(erp_action);
+	int retval = zfcp_fsf_close_lun(erp_action);
 	if (retval == -ENOMEM)
 		return ZFCP_ERP_NOMEM;
-	erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
+	erp_action->step = ZFCP_ERP_STEP_LUN_CLOSING;
 	if (retval)
 		return ZFCP_ERP_FAILED;
 	return ZFCP_ERP_CONTINUES;
 }
 
-static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
+static int zfcp_erp_lun_strategy_open(struct zfcp_erp_action *erp_action)
 {
-	int retval = zfcp_fsf_open_unit(erp_action);
+	int retval = zfcp_fsf_open_lun(erp_action);
 	if (retval == -ENOMEM)
 		return ZFCP_ERP_NOMEM;
-	erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
+	erp_action->step = ZFCP_ERP_STEP_LUN_OPENING;
 	if (retval)
 		return  ZFCP_ERP_FAILED;
 	return ZFCP_ERP_CONTINUES;
 }
 
-static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
+static int zfcp_erp_lun_strategy(struct zfcp_erp_action *erp_action)
 {
-	struct zfcp_unit *unit = erp_action->unit;
+	struct scsi_device *sdev = erp_action->sdev;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 
 	switch (erp_action->step) {
 	case ZFCP_ERP_STEP_UNINITIALIZED:
-		zfcp_erp_unit_strategy_clearstati(unit);
-		if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
-			return zfcp_erp_unit_strategy_close(erp_action);
+		zfcp_erp_lun_strategy_clearstati(sdev);
+		if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
+			return zfcp_erp_lun_strategy_close(erp_action);
 		/* already closed, fall through */
-	case ZFCP_ERP_STEP_UNIT_CLOSING:
-		if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
+	case ZFCP_ERP_STEP_LUN_CLOSING:
+		if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
 			return ZFCP_ERP_FAILED;
 		if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 			return ZFCP_ERP_EXIT;
-		return zfcp_erp_unit_strategy_open(erp_action);
+		return zfcp_erp_lun_strategy_open(erp_action);
 
-	case ZFCP_ERP_STEP_UNIT_OPENING:
-		if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
+	case ZFCP_ERP_STEP_LUN_OPENING:
+		if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
 			return ZFCP_ERP_SUCCEEDED;
 	}
 	return ZFCP_ERP_FAILED;
 }
 
-static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
+static int zfcp_erp_strategy_check_lun(struct scsi_device *sdev, int result)
 {
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
 	switch (result) {
 	case ZFCP_ERP_SUCCEEDED :
-		atomic_set(&unit->erp_counter, 0);
-		zfcp_erp_unit_unblock(unit);
+		atomic_set(&zfcp_sdev->erp_counter, 0);
+		zfcp_erp_lun_unblock(sdev);
 		break;
 	case ZFCP_ERP_FAILED :
-		atomic_inc(&unit->erp_counter);
-		if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
-			dev_err(&unit->port->adapter->ccw_device->dev,
-				"ERP failed for unit 0x%016Lx on "
+		atomic_inc(&zfcp_sdev->erp_counter);
+		if (atomic_read(&zfcp_sdev->erp_counter) > ZFCP_MAX_ERPS) {
+			dev_err(&zfcp_sdev->port->adapter->ccw_device->dev,
+				"ERP failed 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, "erusck1", NULL);
+				(unsigned long long)zfcp_scsi_dev_lun(sdev),
+				(unsigned long long)zfcp_sdev->port->wwpn);
+			zfcp_erp_lun_failed(sdev, "ersckl1", NULL);
 		}
 		break;
 	}
 
-	if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
-		zfcp_erp_unit_block(unit, 0);
+	if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
+		zfcp_erp_lun_block(sdev, 0);
 		result = ZFCP_ERP_EXIT;
 	}
 	return result;
@@ -1101,12 +1116,12 @@ static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
 {
 	struct zfcp_adapter *adapter = erp_action->adapter;
 	struct zfcp_port *port = erp_action->port;
-	struct zfcp_unit *unit = erp_action->unit;
+	struct scsi_device *sdev = erp_action->sdev;
 
 	switch (erp_action->action) {
 
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
-		result = zfcp_erp_strategy_check_unit(unit, result);
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		result = zfcp_erp_strategy_check_lun(sdev, result);
 		break;
 
 	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
@@ -1141,7 +1156,8 @@ static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
 	int action = act->action;
 	struct zfcp_adapter *adapter = act->adapter;
 	struct zfcp_port *port = act->port;
-	struct zfcp_unit *unit = act->unit;
+	struct scsi_device *sdev = act->sdev;
+	struct zfcp_scsi_dev *zfcp_sdev;
 	u32 erp_status = act->status;
 
 	switch (action) {
@@ -1164,11 +1180,12 @@ static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
 		}
 		break;
 
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
-		if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
-			_zfcp_erp_unit_reopen(unit,
-					      ZFCP_STATUS_COMMON_ERP_FAILED,
-					      "ersscg3", NULL, 0);
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(sdev);
+		if (zfcp_erp_strat_change_det(&zfcp_sdev->status, erp_status)) {
+			_zfcp_erp_lun_reopen(sdev,
+					     ZFCP_STATUS_COMMON_ERP_FAILED,
+					     "ersscg3", NULL, 0);
 			return ZFCP_ERP_EXIT;
 		}
 		break;
@@ -1179,6 +1196,7 @@ static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
 {
 	struct zfcp_adapter *adapter = erp_action->adapter;
+	struct zfcp_scsi_dev *zfcp_sdev;
 
 	adapter->erp_total_count--;
 	if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
@@ -1190,9 +1208,10 @@ static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
 	zfcp_dbf_rec_action("eractd1", erp_action);
 
 	switch (erp_action->action) {
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
 		atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
-				  &erp_action->unit->status);
+				  &zfcp_sdev->status);
 		break;
 
 	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
@@ -1212,12 +1231,12 @@ static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
 {
 	struct zfcp_adapter *adapter = act->adapter;
 	struct zfcp_port *port = act->port;
-	struct zfcp_unit *unit = act->unit;
+	struct scsi_device *sdev = act->sdev;
 
 	switch (act->action) {
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
 		if (!(act->status & ZFCP_STATUS_ERP_NO_REF))
-			put_device(&unit->dev);
+			scsi_device_put(sdev);
 		break;
 
 	case ZFCP_ERP_ACTION_REOPEN_PORT:
@@ -1248,8 +1267,8 @@ static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
 		return zfcp_erp_port_forced_strategy(erp_action);
 	case ZFCP_ERP_ACTION_REOPEN_PORT:
 		return zfcp_erp_port_strategy(erp_action);
-	case ZFCP_ERP_ACTION_REOPEN_UNIT:
-		return zfcp_erp_unit_strategy(erp_action);
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		return zfcp_erp_lun_strategy(erp_action);
 	}
 	return ZFCP_ERP_FAILED;
 }
@@ -1426,15 +1445,15 @@ void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
 }
 
 /**
- * zfcp_erp_unit_failed - Set unit status to failed.
- * @unit: Failed unit.
+ * zfcp_erp_lun_failed - Set LUN status to failed.
+ * @sdev: Failed SCSI device / LUN
  * @id: Event id for debug trace.
  * @ref: Reference for debug trace.
  */
-void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
+void zfcp_erp_lun_failed(struct scsi_device *sdev, char *id, void *ref)
 {
-	zfcp_erp_modify_unit_status(unit, id, ref,
-				    ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
+	zfcp_erp_modify_lun_status(sdev, id, ref,
+				   ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
 }
 
 /**
@@ -1456,7 +1475,7 @@ void zfcp_erp_wait(struct zfcp_adapter *adapter)
  * @mask: status bits to change
  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
  *
- * Changes in common status bits are propagated to attached ports and units.
+ * Changes in common status bits are propagated to attached ports and LUNs.
  */
 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
 				    void *ref, u32 mask, int set_or_clear)
@@ -1494,13 +1513,12 @@ void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
  * @mask: status bits to change
  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
  *
- * Changes in common status bits are propagated to attached units.
+ * Changes in common status bits are propagated to attached LUNs.
  */
 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
 				 u32 mask, int set_or_clear)
 {
-	struct zfcp_unit *unit;
-	unsigned long flags;
+	struct scsi_device *sdev;
 	u32 common_mask = mask & ZFCP_COMMON_FLAGS;
 
 	if (set_or_clear == ZFCP_SET) {
@@ -1515,36 +1533,37 @@ void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
 			atomic_set(&port->erp_counter, 0);
 	}
 
-	if (common_mask) {
-		read_lock_irqsave(&port->unit_list_lock, flags);
-		list_for_each_entry(unit, &port->unit_list, list)
-			zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
-						    set_or_clear);
-		read_unlock_irqrestore(&port->unit_list_lock, flags);
-	}
+	if (common_mask)
+		shost_for_each_device(sdev, port->adapter->scsi_host)
+			if (sdev_to_zfcp(sdev)->port == port)
+				zfcp_erp_modify_lun_status(sdev, id, ref,
+							   common_mask,
+							   set_or_clear);
 }
 
 /**
- * zfcp_erp_modify_unit_status - change unit status bits
- * @unit: unit to change the status bits
+ * zfcp_erp_modify_lun_status - change LUN status bits
+ * @sdev: SCSI device / LUN where to change the status bits
  * @id: id for the debug trace
  * @ref: reference for the debug trace
  * @mask: status bits to change
  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
  */
-void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
-				 u32 mask, int set_or_clear)
+void zfcp_erp_modify_lun_status(struct scsi_device *sdev, char *id, void *ref,
+				u32 mask, int set_or_clear)
 {
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
 	if (set_or_clear == ZFCP_SET) {
-		if (status_change_set(mask, &unit->status))
-			zfcp_dbf_rec_unit(id, ref, unit);
-		atomic_set_mask(mask, &unit->status);
+		if (status_change_set(mask, &zfcp_sdev->status))
+			zfcp_dbf_rec_lun(id, ref, sdev);
+		atomic_set_mask(mask, &zfcp_sdev->status);
 	} else {
-		if (status_change_clear(mask, &unit->status))
-			zfcp_dbf_rec_unit(id, ref, unit);
-		atomic_clear_mask(mask, &unit->status);
+		if (status_change_clear(mask, &zfcp_sdev->status))
+			zfcp_dbf_rec_lun(id, ref, sdev);
+		atomic_clear_mask(mask, &zfcp_sdev->status);
 		if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
-			atomic_set(&unit->erp_counter, 0);
+			atomic_set(&zfcp_sdev->erp_counter, 0);
 		}
 	}
 }
@@ -1563,16 +1582,16 @@ void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
 }
 
 /**
- * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
- * @port: The "boxed" unit.
+ * zfcp_erp_lun_boxed - Mark LUN as "boxed" and start ERP
+ * @sdev: The "boxed" SCSI device / LUN.
  * @id: The debug trace id.
- * @id: Reference for the debug trace.
+ * @ref: Reference for the debug trace.
  */
-void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
+void zfcp_erp_lun_boxed(struct scsi_device *sdev, char *id, void *ref)
 {
-	zfcp_erp_modify_unit_status(unit, id, ref,
-				    ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
-	zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
+	zfcp_erp_modify_lun_status(sdev, id, ref,
+				   ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
+	zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
 }
 
 /**
@@ -1582,7 +1601,7 @@ void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
  * @ref: reference for debug trace
  *
  * Since the adapter has denied access, stop using the port and the
- * attached units.
+ * attached LUNs.
  */
 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
 {
@@ -1592,44 +1611,44 @@ void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
 }
 
 /**
- * zfcp_erp_unit_access_denied - Adapter denied access to unit.
- * @unit: unit where access has been denied
+ * zfcp_erp_lun_access_denied - Adapter denied access to LUN.
+ * @sdev: SCSI device / LUN where access has been denied
  * @id: id for debug trace
  * @ref: reference for debug trace
  *
- * Since the adapter has denied access, stop using the unit.
+ * Since the adapter has denied access, stop using the LUN.
  */
-void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
+void zfcp_erp_lun_access_denied(struct scsi_device *sdev, char *id, void *ref)
 {
-	zfcp_erp_modify_unit_status(unit, id, ref,
-				    ZFCP_STATUS_COMMON_ERP_FAILED |
-				    ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
+	zfcp_erp_modify_lun_status(sdev, id, ref,
+				   ZFCP_STATUS_COMMON_ERP_FAILED |
+				   ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
 }
 
-static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
-					 void *ref)
+static void zfcp_erp_lun_access_changed(struct scsi_device *sdev, char *id,
+					void *ref)
 {
-	int status = atomic_read(&unit->status);
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	int status = atomic_read(&zfcp_sdev->status);
+
 	if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
 			ZFCP_STATUS_COMMON_ACCESS_BOXED)))
 		return;
 
-	zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
+	zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
 }
 
 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
 					 void *ref)
 {
-	struct zfcp_unit *unit;
-	unsigned long flags;
+	struct scsi_device *sdev;
 	int status = atomic_read(&port->status);
 
 	if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
 			ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
-		read_lock_irqsave(&port->unit_list_lock, flags);
-		list_for_each_entry(unit, &port->unit_list, list)
-				    zfcp_erp_unit_access_changed(unit, id, ref);
-		read_unlock_irqrestore(&port->unit_list_lock, flags);
+		shost_for_each_device(sdev, port->adapter->scsi_host)
+			if (sdev_to_zfcp(sdev)->port == port)
+				zfcp_erp_lun_access_changed(sdev, id, ref);
 		return;
 	}