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Commit 3b210e76 authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Martin Schwidefsky
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[S390] tape: add medium state notifications 



Add uevent notifications for tape cartridge load and tape
cartridge unload events.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 25591b07

drivers/s390/char/tape_core.c

+59 −9
Original line number Diff line number Diff line
@@ -209,29 +209,79 @@ tape_state_set(struct tape_device *device, enum tape_state newstate) 
	wake_up(&device->state_change_wq);

}



struct tape_med_state_work_data {

	struct tape_device *device;

	enum tape_medium_state state;

	struct work_struct  work;

};



static void

tape_med_state_work_handler(struct work_struct *work)

{

	static char env_state_loaded[] = "MEDIUM_STATE=LOADED";

	static char env_state_unloaded[] = "MEDIUM_STATE=UNLOADED";

	struct tape_med_state_work_data *p =

		container_of(work, struct tape_med_state_work_data, work);

	struct tape_device *device = p->device;

	char *envp[] = { NULL, NULL };



	switch (p->state) {

	case MS_UNLOADED:

		pr_info("%s: The tape cartridge has been successfully "

			"unloaded\n", dev_name(&device->cdev->dev));

		envp[0] = env_state_unloaded;

		kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);

		break;

	case MS_LOADED:

		pr_info("%s: A tape cartridge has been mounted\n",

			dev_name(&device->cdev->dev));

		envp[0] = env_state_loaded;

		kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);

		break;

	default:

		break;

	}

	tape_put_device(device);

	kfree(p);

}



static void

tape_med_state_work(struct tape_device *device, enum tape_medium_state state)

{

	struct tape_med_state_work_data *p;



	p = kzalloc(sizeof(*p), GFP_ATOMIC);

	if (p) {

		INIT_WORK(&p->work, tape_med_state_work_handler);

		p->device = tape_get_device(device);

		p->state = state;

		schedule_work(&p->work);

	}

}



void

tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)

{

	if (device->medium_state == newstate)

	enum tape_medium_state oldstate;



	oldstate = device->medium_state;

	if (oldstate == newstate)

		return;

	device->medium_state = newstate;

	switch(newstate){

	case MS_UNLOADED:

		device->tape_generic_status |= GMT_DR_OPEN(~0);

		if (device->medium_state == MS_LOADED)

			pr_info("%s: The tape cartridge has been successfully "

				"unloaded\n", dev_name(&device->cdev->dev));

		if (oldstate == MS_LOADED)

			tape_med_state_work(device, MS_UNLOADED);

		break;

	case MS_LOADED:

		device->tape_generic_status &= ~GMT_DR_OPEN(~0);

		if (device->medium_state == MS_UNLOADED)

			pr_info("%s: A tape cartridge has been mounted\n",

				dev_name(&device->cdev->dev));

		if (oldstate == MS_UNLOADED)

			tape_med_state_work(device, MS_LOADED);

		break;

	default:

		// print nothing

		break;

	}

	device->medium_state = newstate;

	wake_up(&device->state_change_wq);

}