15  * with this program; if not, write to the Free Software Foundation, Inc.,
16  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 		if (!strncmp(tmp->name, name, strlen(tmp->name))) {  in get_device_handler()
48  * device_handler_match_function - Match a device handler to a device
49  * @sdev - SCSI device to be tested
61 		if (tmp_dh->match && tmp_dh->match(sdev)) {  in device_handler_match_function()
71  * device_handler_match - Attach a device handler to a device
72  * @scsi_dh - The device handler to match against or NULL
73  * @sdev - SCSI device to be tested against @scsi_dh
94  * scsi_dh_handler_attach - Attach a device handler to a device
95  * @sdev - SCSI device the device handler should attach to
96  * @scsi_dh - The device handler to attach
103 	if (sdev->scsi_dh_data) {  in scsi_dh_handler_attach()
104 		if (sdev->scsi_dh_data->scsi_dh != scsi_dh)  in scsi_dh_handler_attach()
105 			err = -EBUSY;  in scsi_dh_handler_attach()
107 			kref_get(&sdev->scsi_dh_data->kref);  in scsi_dh_handler_attach()
108 	} else if (scsi_dh->attach) {  in scsi_dh_handler_attach()
109 		err = scsi_dh->attach(sdev);  in scsi_dh_handler_attach()
111 			kref_init(&sdev->scsi_dh_data->kref);  in scsi_dh_handler_attach()
112 			sdev->scsi_dh_data->sdev = sdev;  in scsi_dh_handler_attach()
121 	scsi_dh_data->scsi_dh->detach(scsi_dh_data->sdev);  in __detach_handler()
125  * scsi_dh_handler_detach - Detach a device handler from a device
126  * @sdev - SCSI device the device handler should be detached from
127  * @scsi_dh - Device handler to be detached
135 	if (!sdev->scsi_dh_data)  in scsi_dh_handler_detach()
138 	if (scsi_dh && scsi_dh != sdev->scsi_dh_data->scsi_dh)  in scsi_dh_handler_detach()
142 		scsi_dh = sdev->scsi_dh_data->scsi_dh;  in scsi_dh_handler_detach()
144 	if (scsi_dh && scsi_dh->detach)  in scsi_dh_handler_detach()
145 		kref_put(&sdev->scsi_dh_data->kref, __detach_handler);  in scsi_dh_handler_detach()
157 	int err = -EINVAL;  in store_dh_state()
159 	if (sdev->sdev_state == SDEV_CANCEL ||  in store_dh_state()
160 	    sdev->sdev_state == SDEV_DEL)  in store_dh_state()
161 		return -ENODEV;  in store_dh_state()
163 	if (!sdev->scsi_dh_data) {  in store_dh_state()
165 		 * Attach to a device handler  in store_dh_state()
171 		scsi_dh = sdev->scsi_dh_data->scsi_dh;  in store_dh_state()
178 		} else if (!strncmp(buf, "activate", 8)) {  in store_dh_state()
180 			 * Activate a device handler  in store_dh_state()
182 			if (scsi_dh->activate)  in store_dh_state()
183 				err = scsi_dh->activate(sdev, NULL, NULL);  in store_dh_state()
197 	if (!sdev->scsi_dh_data)  in show_dh_state()
200 	return snprintf(buf, 20, "%s\n", sdev->scsi_dh_data->scsi_dh->name);  in show_dh_state()
208  * scsi_dh_sysfs_attr_add - Callback for scsi_init_dh
220 	err = device_create_file(&sdev->sdev_gendev,  in scsi_dh_sysfs_attr_add()
227  * scsi_dh_sysfs_attr_remove - Callback for scsi_exit_dh
238 	device_remove_file(&sdev->sdev_gendev,  in scsi_dh_sysfs_attr_remove()
245  * scsi_dh_notifier - notifier chain callback
274  * scsi_dh_notifier_add - Callback for scsi_register_device_handler
298  * scsi_dh_notifier_remove - Callback for scsi_unregister_device_handler
321  * scsi_register_device_handler - register a device handler personality
323  * @scsi_dh - device handler to be registered.
325  * Returns 0 on success, -EBUSY if handler already registered.
330 	if (get_device_handler(scsi_dh->name))  in scsi_register_device_handler()
331 		return -EBUSY;  in scsi_register_device_handler()
334 	list_add(&scsi_dh->list, &scsi_dh_list);  in scsi_register_device_handler()
338 	printk(KERN_INFO "%s: device handler registered\n", scsi_dh->name);  in scsi_register_device_handler()
345  * scsi_unregister_device_handler - register a device handler personality
347  * @scsi_dh - device handler to be unregistered.
349  * Returns 0 on success, -ENODEV if handler not registered.
354 	if (!get_device_handler(scsi_dh->name))  in scsi_unregister_device_handler()
355 		return -ENODEV;  in scsi_unregister_device_handler()
361 	list_del(&scsi_dh->list);  in scsi_unregister_device_handler()
363 	printk(KERN_INFO "%s: device handler unregistered\n", scsi_dh->name);  in scsi_unregister_device_handler()
370  * scsi_dh_activate - activate the path associated with the scsi_device
371  *      corresponding to the given request queue.
372  *     Returns immediately without waiting for activation to be completed.
373  * @q    - Request queue that is associated with the scsi_device to be
375  * @fn   - Function to be called upon completion of the activation.
379  * @data - data passed to the function fn upon completion.
390 	spin_lock_irqsave(q->queue_lock, flags);  in scsi_dh_activate()
391 	sdev = q->queuedata;  in scsi_dh_activate()
393 		spin_unlock_irqrestore(q->queue_lock, flags);  in scsi_dh_activate()
400 	if (sdev->scsi_dh_data)  in scsi_dh_activate()
401 		scsi_dh = sdev->scsi_dh_data->scsi_dh;  in scsi_dh_activate()
402 	dev = get_device(&sdev->sdev_gendev);  in scsi_dh_activate()
404 	    sdev->sdev_state == SDEV_CANCEL ||  in scsi_dh_activate()
405 	    sdev->sdev_state == SDEV_DEL)  in scsi_dh_activate()
407 	if (sdev->sdev_state == SDEV_OFFLINE)  in scsi_dh_activate()
409 	spin_unlock_irqrestore(q->queue_lock, flags);  in scsi_dh_activate()
417 	if (scsi_dh->activate)  in scsi_dh_activate()
418 		err = scsi_dh->activate(sdev, fn, data);  in scsi_dh_activate()
426  * scsi_dh_set_params - set the parameters for the device as per the
428  * @q - Request queue that is associated with the scsi_device for
429  *      which the parameters to be set.
430  * @params - parameters in the following format
437 	int err = -SCSI_DH_NOSYS;  in scsi_dh_set_params()
442 	spin_lock_irqsave(q->queue_lock, flags);  in scsi_dh_set_params()
443 	sdev = q->queuedata;  in scsi_dh_set_params()
444 	if (sdev && sdev->scsi_dh_data)  in scsi_dh_set_params()
445 		scsi_dh = sdev->scsi_dh_data->scsi_dh;  in scsi_dh_set_params()
446 	if (scsi_dh && scsi_dh->set_params && get_device(&sdev->sdev_gendev))  in scsi_dh_set_params()
448 	spin_unlock_irqrestore(q->queue_lock, flags);  in scsi_dh_set_params()
452 	err = scsi_dh->set_params(sdev, params);  in scsi_dh_set_params()
453 	put_device(&sdev->sdev_gendev);  in scsi_dh_set_params()
459  * scsi_dh_handler_exist - Return TRUE(1) if a device handler exists for
461  * @name - name of the device handler.
470  * scsi_dh_attach - Attach device handler
471  * @sdev - sdev the handler should be attached to
472  * @name - name of the handler to attach
483 		return -EINVAL;  in scsi_dh_attach()
485 	spin_lock_irqsave(q->queue_lock, flags);  in scsi_dh_attach()
486 	sdev = q->queuedata;  in scsi_dh_attach()
487 	if (!sdev || !get_device(&sdev->sdev_gendev))  in scsi_dh_attach()
488 		err = -ENODEV;  in scsi_dh_attach()
489 	spin_unlock_irqrestore(q->queue_lock, flags);  in scsi_dh_attach()
493 		put_device(&sdev->sdev_gendev);  in scsi_dh_attach()
500  * scsi_dh_detach - Detach device handler
501  * @sdev - sdev the handler should be detached from
513 	spin_lock_irqsave(q->queue_lock, flags);  in scsi_dh_detach()
514 	sdev = q->queuedata;  in scsi_dh_detach()
515 	if (!sdev || !get_device(&sdev->sdev_gendev))  in scsi_dh_detach()
517 	spin_unlock_irqrestore(q->queue_lock, flags);  in scsi_dh_detach()
522 	if (sdev->scsi_dh_data) {  in scsi_dh_detach()
523 		scsi_dh = sdev->scsi_dh_data->scsi_dh;  in scsi_dh_detach()
526 	put_device(&sdev->sdev_gendev);  in scsi_dh_detach()