C++ zfcp_erp_wait函数代码示例

static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
	struct zfcp_unit *unit;
	u64 fcp_lun;
	int retval = -EINVAL;

	if (!(port && get_device(&port->dev)))
		return -EBUSY;

	if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun))
		goto out;

	unit = zfcp_unit_enqueue(port, fcp_lun);
	if (IS_ERR(unit))
		goto out;
	else
		retval = 0;

	zfcp_erp_unit_reopen(unit, 0, "syuas_1", NULL);
	zfcp_erp_wait(unit->port->adapter);
	zfcp_scsi_scan(unit);
out:
	put_device(&port->dev);
	return retval ? retval : (ssize_t) count;
}

/**
 * zfcp_sysfs_unit_failed_store - failed state of unit
 * @dev: pointer to belonging device
 * @buf: pointer to input buffer
 * @count: number of bytes in buffer
 *
 * Store function of the "failed" attribute of a unit.
 * If a "0" gets written to "failed", error recovery will be
 * started for the belonging unit.
 */
static ssize_t
zfcp_sysfs_unit_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct zfcp_unit *unit;
	unsigned int val;
	char *endp;
	int retval = 0;

	down(&zfcp_data.config_sema);
	unit = dev_get_drvdata(dev);
	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
		retval = -EBUSY;
		goto out;
	}

	val = simple_strtoul(buf, &endp, 0);
	if (((endp + 1) < (buf + count)) || (val != 0)) {
		retval = -EINVAL;
		goto out;
	}

	zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
	zfcp_erp_wait(unit->port->adapter);
 out:
	up(&zfcp_data.config_sema);
	return retval ? retval : (ssize_t) count;
}

static void __init zfcp_init_device_configure(void)
{
	struct zfcp_adapter *adapter;
	struct zfcp_port *port;
	struct zfcp_unit *unit;

	down(&zfcp_data.config_sema);
	read_lock_irq(&zfcp_data.config_lock);
	adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
	if (adapter)
		zfcp_adapter_get(adapter);
	read_unlock_irq(&zfcp_data.config_lock);

	if (!adapter)
		goto out_adapter;
	port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
	if (IS_ERR(port))
		goto out_port;
	unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
	if (IS_ERR(unit))
		goto out_unit;
	up(&zfcp_data.config_sema);
	ccw_device_set_online(adapter->ccw_device);
	zfcp_erp_wait(adapter);
	down(&zfcp_data.config_sema);
	zfcp_unit_put(unit);
out_unit:
	zfcp_port_put(port);
out_port:
	zfcp_adapter_put(adapter);
out_adapter:
	up(&zfcp_data.config_sema);
	return;
}

/**
 * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
 * @dev: pointer to belonging device
 * @buf: pointer to input buffer
 * @count: number of bytes in buffer
 *
 * Store function of the "unit_add" attribute of a port.
 */
static ssize_t
zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	fcp_lun_t fcp_lun;
	char *endp;
	struct zfcp_port *port;
	struct zfcp_unit *unit;
	int retval = -EINVAL;

	down(&zfcp_data.config_sema);

	port = dev_get_drvdata(dev);
	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
		retval = -EBUSY;
		goto out;
	}

	fcp_lun = simple_strtoull(buf, &endp, 0);
	if ((endp + 1) < (buf + count))
		goto out;

	unit = zfcp_unit_enqueue(port, fcp_lun);
	if (!unit)
		goto out;

	retval = 0;

	zfcp_erp_unit_reopen(unit, 0);
	zfcp_erp_wait(unit->port->adapter);
	zfcp_unit_put(unit);
 out:
	up(&zfcp_data.config_sema);
	return retval ? retval : (ssize_t) count;
}

static ssize_t zfcp_sysfs_adapter_failed_store(struct device *dev,
					       struct device_attribute *attr,
					       const char *buf, size_t count)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
	unsigned long val;
	int retval = 0;

	if (!adapter)
		return -ENODEV;

	if (strict_strtoul(buf, 0, &val) || val != 0) {
		retval = -EINVAL;
		goto out;
	}

	zfcp_erp_modify_adapter_status(adapter, "syafai1", NULL,
				       ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
				"syafai2", NULL);
	zfcp_erp_wait(adapter);
out:
	zfcp_ccw_adapter_put(adapter);
	return retval ? retval : (ssize_t) count;
}

static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	struct zfcp_port *port = dev_get_drvdata(dev);
	struct zfcp_unit *unit;
	fcp_lun_t fcp_lun;
	int retval = -EINVAL;

	down(&zfcp_data.config_sema);
	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE) {
		retval = -EBUSY;
		goto out;
	}

	if (strict_strtoull(buf, 0, &fcp_lun))
		goto out;

	unit = zfcp_unit_enqueue(port, fcp_lun);
	if (IS_ERR(unit))
		goto out;

	retval = 0;

	zfcp_erp_unit_reopen(unit, 0, 94, NULL);
	zfcp_erp_wait(unit->port->adapter);
	zfcp_unit_put(unit);
out:
	up(&zfcp_data.config_sema);
	return retval ? retval : (ssize_t) count;
}

static ssize_t zfcp_sysfs_unit_remove_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct zfcp_port *port = dev_get_drvdata(dev);
	struct zfcp_unit *unit;
	u64 fcp_lun;
	LIST_HEAD(unit_remove_lh);
	struct scsi_device *sdev;

	mutex_lock(&zfcp_data.config_mutex);
	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE) {
		mutex_unlock(&zfcp_data.config_mutex);
		return -EBUSY;
	}

	if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun)) {
		mutex_unlock(&zfcp_data.config_mutex);
		return -EINVAL;
	}

	read_lock_irq(&zfcp_data.config_lock);
	unit = zfcp_get_unit_by_lun(port, fcp_lun);
	read_unlock_irq(&zfcp_data.config_lock);
	if (!unit) {
		mutex_unlock(&zfcp_data.config_mutex);
		return -ENXIO;
	}
	zfcp_unit_get(unit);
	mutex_unlock(&zfcp_data.config_mutex);

	sdev = scsi_device_lookup(port->adapter->scsi_host, 0,
				  port->starget_id,
				  scsilun_to_int((struct scsi_lun *)&fcp_lun));
	if (sdev) {
		scsi_remove_device(sdev);
		scsi_device_put(sdev);
	}

	mutex_lock(&zfcp_data.config_mutex);
	zfcp_unit_put(unit);
	if (atomic_read(&unit->refcount)) {
		mutex_unlock(&zfcp_data.config_mutex);
		return -ENXIO;
	}

	write_lock_irq(&zfcp_data.config_lock);
	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
	list_move(&unit->list, &unit_remove_lh);
	write_unlock_irq(&zfcp_data.config_lock);
	mutex_unlock(&zfcp_data.config_mutex);

	zfcp_erp_unit_shutdown(unit, 0, "syurs_1", NULL);
	zfcp_erp_wait(unit->port->adapter);
	zfcp_unit_dequeue(unit);

	return (ssize_t)count;
}

void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
{
    unsigned long flags;
    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_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF);
    write_unlock_irqrestore(&adapter->erp_lock, flags);

    zfcp_erp_wait(adapter);
}

static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
	int ret;

	zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
	zfcp_erp_wait(adapter);
	ret = fc_block_scsi_eh(scpnt);
	if (ret)
		return ret;

	return SUCCESS;
}

/**
 * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
 * @dev: pointer to belonging device
 * @buf: pointer to input buffer
 * @count: number of bytes in buffer
 */
static ssize_t
zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct zfcp_port *port;
	struct zfcp_unit *unit;
	fcp_lun_t fcp_lun;
	char *endp;
	int retval = 0;

	down(&zfcp_data.config_sema);

	port = dev_get_drvdata(dev);
	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
		retval = -EBUSY;
		goto out;
	}

	fcp_lun = simple_strtoull(buf, &endp, 0);
	if ((endp + 1) < (buf + count)) {
		retval = -EINVAL;
		goto out;
	}

	write_lock_irq(&zfcp_data.config_lock);
	unit = zfcp_get_unit_by_lun(port, fcp_lun);
	if (unit && (atomic_read(&unit->refcount) == 0)) {
		zfcp_unit_get(unit);
		atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
		list_move(&unit->list, &port->unit_remove_lh);
	}
	else {
		unit = NULL;
	}
	write_unlock_irq(&zfcp_data.config_lock);

	if (!unit) {
		retval = -ENXIO;
		goto out;
	}

	zfcp_erp_unit_shutdown(unit, 0);
	zfcp_erp_wait(unit->port->adapter);
	zfcp_unit_put(unit);
	zfcp_unit_dequeue(unit);
 out:
	up(&zfcp_data.config_sema);
	return retval ? retval : (ssize_t) count;
}

static ssize_t zfcp_sysfs_port_failed_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
	unsigned long val;

	if (strict_strtoul(buf, 0, &val) || val != 0)
		return -EINVAL;

	zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_RUNNING);
	zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, "sypfai2");
	zfcp_erp_wait(port->adapter);

	return count;
}

static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
{
	struct ccw_device *ccwdev;
	struct zfcp_adapter *adapter;
	struct zfcp_port *port;
	struct zfcp_unit *unit;

	ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
	if (!ccwdev)
		return;

	if (ccw_device_set_online(ccwdev))
		goto out_ccwdev;

	mutex_lock(&zfcp_data.config_mutex);
	adapter = dev_get_drvdata(&ccwdev->dev);
	if (!adapter)
		goto out_unlock;
	zfcp_adapter_get(adapter);

	port = zfcp_get_port_by_wwpn(adapter, wwpn);
	if (!port)
		goto out_port;

	zfcp_port_get(port);
	unit = zfcp_unit_enqueue(port, lun);
	if (IS_ERR(unit))
		goto out_unit;
	mutex_unlock(&zfcp_data.config_mutex);

	zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL);
	zfcp_erp_wait(adapter);
	flush_work(&unit->scsi_work);

	mutex_lock(&zfcp_data.config_mutex);
	zfcp_unit_put(unit);
out_unit:
	zfcp_port_put(port);
out_port:
	zfcp_adapter_put(adapter);
out_unlock:
	mutex_unlock(&zfcp_data.config_mutex);
out_ccwdev:
	put_device(&ccwdev->dev);
	return;
}

static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
{
	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *) sdev->host->hostdata[0];
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
	struct zfcp_port *port;
	struct zfcp_unit *unit;
	int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;

	zfcp_sdev->erp_action.adapter = adapter;
	zfcp_sdev->erp_action.sdev = sdev;

	port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
	if (!port)
		return -ENXIO;

	zfcp_sdev->erp_action.port = port;

	unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
	if (unit)
		put_device(&unit->dev);

	if (!unit && !(allow_lun_scan && npiv)) {
		put_device(&port->dev);
		return -ENXIO;
	}

	zfcp_sdev->port = port;
	zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
	zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
	spin_lock_init(&zfcp_sdev->latencies.lock);

	zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
	zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
	zfcp_erp_wait(port->adapter);

	return 0;
}

static ssize_t zfcp_sysfs_unit_failed_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
	unsigned long val;
	struct scsi_device *sdev;

	if (strict_strtoul(buf, 0, &val) || val != 0)
		return -EINVAL;

	sdev = zfcp_unit_sdev(unit);
	if (sdev) {
		zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
		zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED,
				    "syufai2");
		zfcp_erp_wait(unit->port->adapter);
	} else
		zfcp_unit_scsi_scan(unit);

	return count;
}

static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
{
	struct zfcp_adapter *adapter;
	struct zfcp_port *port;
	struct zfcp_unit *unit;

	down(&zfcp_data.config_sema);
	read_lock_irq(&zfcp_data.config_lock);
	adapter = zfcp_get_adapter_by_busid(busid);
	if (adapter)
		zfcp_adapter_get(adapter);
	read_unlock_irq(&zfcp_data.config_lock);

	if (!adapter)
		goto out_adapter;
	port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
	if (IS_ERR(port))
		goto out_port;
	unit = zfcp_unit_enqueue(port, lun);
	if (IS_ERR(unit))
		goto out_unit;
	up(&zfcp_data.config_sema);
	ccw_device_set_online(adapter->ccw_device);

	zfcp_erp_wait(adapter);
	wait_event(adapter->erp_done_wqh,
		   !(atomic_read(&unit->status) &
				ZFCP_STATUS_UNIT_SCSI_WORK_PENDING));

	down(&zfcp_data.config_sema);
	zfcp_unit_put(unit);
out_unit:
	zfcp_port_put(port);
out_port:
	zfcp_adapter_put(adapter);
out_adapter:
	up(&zfcp_data.config_sema);
	return;
}