1 // SPDX-License-Identifier: GPL-2.0
3  * Disk events - monitor disk events like media change and eject request.
20 	long			poll_msecs;	/* interval, -1 for default */
38 /* disable in-kernel polling by default */
43 	struct disk_events *ev = disk->ev;  in disk_events_poll_jiffies()
47 	 * If device-specific poll interval is set, always use it.  If  in disk_events_poll_jiffies()
48 	 * the default is being used, poll if the POLL flag is set.  in disk_events_poll_jiffies()
50 	if (ev->poll_msecs >= 0)  in disk_events_poll_jiffies()
51 		intv_msecs = ev->poll_msecs;  in disk_events_poll_jiffies()
52 	else if (disk->event_flags & DISK_EVENT_FLAG_POLL)  in disk_events_poll_jiffies()
59  * disk_block_events - block and flush disk event checking
75 	struct disk_events *ev = disk->ev;  in disk_block_events()
86 	mutex_lock(&ev->block_mutex);  in disk_block_events()
88 	spin_lock_irqsave(&ev->lock, flags);  in disk_block_events()
89 	cancel = !ev->block++;  in disk_block_events()
90 	spin_unlock_irqrestore(&ev->lock, flags);  in disk_block_events()
93 		cancel_delayed_work_sync(&disk->ev->dwork);  in disk_block_events()
95 	mutex_unlock(&ev->block_mutex);  in disk_block_events()
100 	struct disk_events *ev = disk->ev;  in __disk_unblock_events()
104 	spin_lock_irqsave(&ev->lock, flags);  in __disk_unblock_events()
106 	if (WARN_ON_ONCE(ev->block <= 0))  in __disk_unblock_events()
109 	if (--ev->block)  in __disk_unblock_events()
115 				&ev->dwork, 0);  in __disk_unblock_events()
118 				&ev->dwork, intv);  in __disk_unblock_events()
120 	spin_unlock_irqrestore(&ev->lock, flags);  in __disk_unblock_events()
124  * disk_unblock_events - unblock disk event checking
135 	if (disk->ev)  in disk_unblock_events()
140  * disk_flush_events - schedule immediate event checking and flushing
146  * doesn't clear the events from @disk->ev.
149  * If @mask is non-zero must be called with disk->open_mutex held.
153 	struct disk_events *ev = disk->ev;  in disk_flush_events()
158 	spin_lock_irq(&ev->lock);  in disk_flush_events()
159 	ev->clearing |= mask;  in disk_flush_events()
160 	if (!ev->block)  in disk_flush_events()
162 				&ev->dwork, 0);  in disk_flush_events()
163 	spin_unlock_irq(&ev->lock);  in disk_flush_events()
167  * Tell userland about new events.  Only the events listed in @disk->events are
177 		if (events & disk->events & (1 << i))  in disk_event_uevent()
181 		kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp);  in disk_event_uevent()
187 	struct gendisk *disk = ev->disk;  in disk_check_events()
193 	events = disk->fops->check_events(disk, clearing);  in disk_check_events()
195 	/* accumulate pending events and schedule next poll if necessary */  in disk_check_events()
196 	spin_lock_irq(&ev->lock);  in disk_check_events()
198 	events &= ~ev->pending;  in disk_check_events()
199 	ev->pending |= events;  in disk_check_events()
203 	if (!ev->block && intv)  in disk_check_events()
205 				&ev->dwork, intv);  in disk_check_events()
207 	spin_unlock_irq(&ev->lock);  in disk_check_events()
212 	if (disk->event_flags & DISK_EVENT_FLAG_UEVENT)  in disk_check_events()
217  * disk_clear_events - synchronously check, clear and return pending events
229 	struct disk_events *ev = disk->ev;  in disk_clear_events()
239 	 * store the union of mask and ev->clearing on the stack so that the  in disk_clear_events()
240 	 * race with disk_flush_events does not cause ambiguity (ev->clearing  in disk_clear_events()
243 	spin_lock_irq(&ev->lock);  in disk_clear_events()
244 	clearing |= ev->clearing;  in disk_clear_events()
245 	ev->clearing = 0;  in disk_clear_events()
246 	spin_unlock_irq(&ev->lock);  in disk_clear_events()
250 	 * if ev->clearing is not 0, the disk_flush_events got called in the  in disk_clear_events()
253 	__disk_unblock_events(disk, ev->clearing ? true : false);  in disk_clear_events()
256 	spin_lock_irq(&ev->lock);  in disk_clear_events()
257 	pending = ev->pending & mask;  in disk_clear_events()
258 	ev->pending &= ~mask;  in disk_clear_events()
259 	spin_unlock_irq(&ev->lock);  in disk_clear_events()
266  * disk_check_media_change - check if a removable media has been changed
284 	bdev_mark_dead(disk->part0, true);  in disk_check_media_change()
285 	set_bit(GD_NEED_PART_SCAN, &disk->state);  in disk_check_media_change()
291  * disk_force_media_change - force a media change event
302 	bdev_mark_dead(disk->part0, true);  in disk_force_media_change()
303 	set_bit(GD_NEED_PART_SCAN, &disk->state);  in disk_force_media_change()
316 	disk_check_events(ev, &ev->clearing);  in disk_events_workfn()
326  * events_poll_msecs	: polling interval, 0: disable, -1: system default
350 	if (!(disk->event_flags & DISK_EVENT_FLAG_UEVENT))  in disk_events_show()
352 	return __disk_events_show(disk->events, buf);  in disk_events_show()
367 	if (!disk->ev)  in disk_events_poll_msecs_show()
368 		return sprintf(buf, "-1\n");  in disk_events_poll_msecs_show()
369 	return sprintf(buf, "%ld\n", disk->ev->poll_msecs);  in disk_events_poll_msecs_show()
380 		return -EINVAL;  in disk_events_poll_msecs_store()
382 	if (intv < 0 && intv != -1)  in disk_events_poll_msecs_store()
383 		return -EINVAL;  in disk_events_poll_msecs_store()
385 	if (!disk->ev)  in disk_events_poll_msecs_store()
386 		return -ENODEV;  in disk_events_poll_msecs_store()
389 	disk->ev->poll_msecs = intv;  in disk_events_poll_msecs_store()
400  * The default polling interval can be specified by the kernel
417 		disk_flush_events(ev->disk, 0);  in disk_events_set_dfl_poll_msecs()
434  * disk_{alloc|add|del|release}_events - initialize and destroy disk_events.
440 	if (!disk->fops->check_events || !disk->events)  in disk_alloc_events()
445 		pr_warn("%s: failed to initialize events\n", disk->disk_name);  in disk_alloc_events()
446 		return -ENOMEM;  in disk_alloc_events()
449 	INIT_LIST_HEAD(&ev->node);  in disk_alloc_events()
450 	ev->disk = disk;  in disk_alloc_events()
451 	spin_lock_init(&ev->lock);  in disk_alloc_events()
452 	mutex_init(&ev->block_mutex);  in disk_alloc_events()
453 	ev->block = 1;  in disk_alloc_events()
454 	ev->poll_msecs = -1;  in disk_alloc_events()
455 	INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn);  in disk_alloc_events()
457 	disk->ev = ev;  in disk_alloc_events()
463 	if (!disk->ev)  in disk_add_events()
467 	list_add_tail(&disk->ev->node, &disk_events);  in disk_add_events()
479 	if (disk->ev) {  in disk_del_events()
483 		list_del_init(&disk->ev->node);  in disk_del_events()
491 	WARN_ON_ONCE(disk->ev && disk->ev->block != 1);  in disk_release_events()
492 	kfree(disk->ev);  in disk_release_events()