3  * Disk events - monitor disk events like media change and eject request.
12 	struct gendisk		*disk;		/* the associated disk */  member
41 static unsigned long disk_events_poll_jiffies(struct gendisk *disk)  in disk_events_poll_jiffies()  argument
43 	struct disk_events *ev = disk->ev;  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
60  * @disk: disk to block events for
73 void disk_block_events(struct gendisk *disk)  in disk_block_events()  argument
75 	struct disk_events *ev = disk->ev;  in disk_block_events()
93 		cancel_delayed_work_sync(&disk->ev->dwork);  in disk_block_events()
98 static void __disk_unblock_events(struct gendisk *disk, bool check_now)  in __disk_unblock_events()  argument
100 	struct disk_events *ev = disk->ev;  in __disk_unblock_events()
112 	intv = disk_events_poll_jiffies(disk);  in __disk_unblock_events()
124  * disk_unblock_events - unblock disk event checking
125  * @disk: disk to unblock events for
133 void disk_unblock_events(struct gendisk *disk)  in disk_unblock_events()  argument
135 	if (disk->ev)  in disk_unblock_events()
136 		__disk_unblock_events(disk, false);  in disk_unblock_events()
141  * @disk: disk to check and flush events for
144  * Schedule immediate event checking on @disk if not blocked.  Events in
146  * doesn't clear the events from @disk->ev.
149  * If @mask is non-zero must be called with disk->open_mutex held.
151 void disk_flush_events(struct gendisk *disk, unsigned int mask)  in disk_flush_events()  argument
153 	struct disk_events *ev = disk->ev;  in disk_flush_events()
167  * Tell userland about new events.  Only the events listed in @disk->events are
171 static void disk_event_uevent(struct gendisk *disk, unsigned int events)  in disk_event_uevent()  argument
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()  local
193 	events = disk->fops->check_events(disk, clearing);  in disk_check_events()
202 	intv = disk_events_poll_jiffies(disk);  in disk_check_events()
210 		inc_diskseq(disk);  in disk_check_events()
212 	if (disk->event_flags & DISK_EVENT_FLAG_UEVENT)  in disk_check_events()
213 		disk_event_uevent(disk, events);  in disk_check_events()
218  * @disk: disk to fetch and clear events from
221  * Disk events are synchronously checked and pending events in @mask
227 static unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask)  in disk_clear_events()  argument
229 	struct disk_events *ev = disk->ev;  in disk_clear_events()
236 	disk_block_events(disk);  in disk_clear_events()
253 	__disk_unblock_events(disk, ev->clearing ? true : false);  in disk_clear_events()
294  * @disk: the disk which will raise the event
297  * Generate uevents for the disk. If DISK_EVENT_MEDIA_CHANGE is present,
303 bool disk_force_media_change(struct gendisk *disk, unsigned int events)  in disk_force_media_change()  argument
305 	disk_event_uevent(disk, events);  in disk_force_media_change()
310 	if (__invalidate_device(disk->part0, true))  in disk_force_media_change()
312 			disk->disk_name);  in disk_force_media_change()
313 	set_bit(GD_NEED_PART_SCAN, &disk->state);  in disk_force_media_change()
331  * A disk events enabled device has the following sysfs nodes under
359 	struct gendisk *disk = dev_to_disk(dev);  in disk_events_show()  local
361 	if (!(disk->event_flags & DISK_EVENT_FLAG_UEVENT))  in disk_events_show()
363 	return __disk_events_show(disk->events, buf);  in disk_events_show()
376 	struct gendisk *disk = dev_to_disk(dev);  in disk_events_poll_msecs_show()  local
378 	if (!disk->ev)  in disk_events_poll_msecs_show()
380 	return sprintf(buf, "%ld\n", disk->ev->poll_msecs);  in disk_events_poll_msecs_show()
387 	struct gendisk *disk = dev_to_disk(dev);  in disk_events_poll_msecs_store()  local
396 	if (!disk->ev)  in disk_events_poll_msecs_store()
399 	disk_block_events(disk);  in disk_events_poll_msecs_store()
400 	disk->ev->poll_msecs = intv;  in disk_events_poll_msecs_store()
401 	__disk_unblock_events(disk, true);  in disk_events_poll_msecs_store()
428 		disk_flush_events(ev->disk, 0);  in disk_events_set_dfl_poll_msecs()
447 int disk_alloc_events(struct gendisk *disk)  in disk_alloc_events()  argument
451 	if (!disk->fops->check_events || !disk->events)  in disk_alloc_events()
456 		pr_warn("%s: failed to initialize events\n", disk->disk_name);  in disk_alloc_events()
461 	ev->disk = disk;  in disk_alloc_events()
468 	disk->ev = ev;  in disk_alloc_events()
472 void disk_add_events(struct gendisk *disk)  in disk_add_events()  argument
474 	if (!disk->ev)  in disk_add_events()
478 	list_add_tail(&disk->ev->node, &disk_events);  in disk_add_events()
485 	__disk_unblock_events(disk, true);  in disk_add_events()
488 void disk_del_events(struct gendisk *disk)  in disk_del_events()  argument
490 	if (disk->ev) {  in disk_del_events()
491 		disk_block_events(disk);  in disk_del_events()
494 		list_del_init(&disk->ev->node);  in disk_del_events()
499 void disk_release_events(struct gendisk *disk)  in disk_release_events()  argument
502 	WARN_ON_ONCE(disk->ev && disk->ev->block != 1);  in disk_release_events()
503 	kfree(disk->ev);  in disk_release_events()