56 	struct delay_c *dc = from_timer(dc, t, delay_timer);  in handle_delayed_timer()  local
58 	queue_work(dc->kdelayd_wq, &dc->flush_expired_bios);  in handle_delayed_timer()
61 static void queue_timeout(struct delay_c *dc, unsigned long expires)  in queue_timeout()  argument
63 	mutex_lock(&dc->timer_lock);  in queue_timeout()
65 	if (!timer_pending(&dc->delay_timer) || expires < dc->delay_timer.expires)  in queue_timeout()
66 		mod_timer(&dc->delay_timer, expires);  in queue_timeout()
68 	mutex_unlock(&dc->timer_lock);  in queue_timeout()
71 static inline bool delay_is_fast(struct delay_c *dc)  in delay_is_fast()  argument
73 	return !!dc->worker;  in delay_is_fast()
88 static void flush_delayed_bios(struct delay_c *dc, bool flush_all)  in flush_delayed_bios()  argument
97 	list_for_each_entry_safe(delayed, next, &dc->delayed_bios, list) {  in flush_delayed_bios()
108 		if (!delay_is_fast(dc)) {  in flush_delayed_bios()
120 		queue_timeout(dc, next_expires);  in flush_delayed_bios()
127 	struct delay_c *dc = data;  in flush_worker_fn()  local
130 		flush_delayed_bios(dc, false);  in flush_worker_fn()
132 		if (unlikely(list_empty(&dc->delayed_bios))) {  in flush_worker_fn()
147 	struct delay_c *dc;  in flush_expired_bios()  local
149 	dc = container_of(work, struct delay_c, flush_expired_bios);  in flush_expired_bios()
150 	flush_delayed_bios(dc, false);  in flush_expired_bios()
155 	struct delay_c *dc = ti->private;  in delay_dtr()  local
157 	if (dc->kdelayd_wq)  in delay_dtr()
158 		destroy_workqueue(dc->kdelayd_wq);  in delay_dtr()
160 	if (dc->read.dev)  in delay_dtr()
161 		dm_put_device(ti, dc->read.dev);  in delay_dtr()
162 	if (dc->write.dev)  in delay_dtr()
163 		dm_put_device(ti, dc->write.dev);  in delay_dtr()
164 	if (dc->flush.dev)  in delay_dtr()
165 		dm_put_device(ti, dc->flush.dev);  in delay_dtr()
166 	if (dc->worker)  in delay_dtr()
167 		kthread_stop(dc->worker);  in delay_dtr()
169 	mutex_destroy(&dc->timer_lock);  in delay_dtr()
171 	kfree(dc);  in delay_dtr()
210 	struct delay_c *dc;  in delay_ctr()  local
219 	dc = kzalloc(sizeof(*dc), GFP_KERNEL);  in delay_ctr()
220 	if (!dc) {  in delay_ctr()
225 	ti->private = dc;  in delay_ctr()
226 	INIT_LIST_HEAD(&dc->delayed_bios);  in delay_ctr()
227 	mutex_init(&dc->timer_lock);  in delay_ctr()
228 	dc->may_delay = true;  in delay_ctr()
229 	dc->argc = argc;  in delay_ctr()
231 	ret = delay_class_ctr(ti, &dc->read, argv);  in delay_ctr()
234 	max_delay = dc->read.delay;  in delay_ctr()
237 		ret = delay_class_ctr(ti, &dc->write, argv);  in delay_ctr()
240 		ret = delay_class_ctr(ti, &dc->flush, argv);  in delay_ctr()
243 		max_delay = max(max_delay, dc->write.delay);  in delay_ctr()
244 		max_delay = max(max_delay, dc->flush.delay);  in delay_ctr()
248 	ret = delay_class_ctr(ti, &dc->write, argv + 3);  in delay_ctr()
252 		ret = delay_class_ctr(ti, &dc->flush, argv + 3);  in delay_ctr()
255 		max_delay = max(max_delay, dc->flush.delay);  in delay_ctr()
259 	ret = delay_class_ctr(ti, &dc->flush, argv + 6);  in delay_ctr()
262 	max_delay = max(max_delay, dc->flush.delay);  in delay_ctr()
270 		dc->worker = kthread_create(&flush_worker_fn, dc,  in delay_ctr()
272 		if (IS_ERR(dc->worker)) {  in delay_ctr()
273 			ret = PTR_ERR(dc->worker);  in delay_ctr()
274 			dc->worker = NULL;  in delay_ctr()
278 		timer_setup(&dc->delay_timer, handle_delayed_timer, 0);  in delay_ctr()
279 		INIT_WORK(&dc->flush_expired_bios, flush_expired_bios);  in delay_ctr()
280 		dc->kdelayd_wq = alloc_workqueue("kdelayd", WQ_MEM_RECLAIM, 0);  in delay_ctr()
281 		if (!dc->kdelayd_wq) {  in delay_ctr()
299 static int delay_bio(struct delay_c *dc, struct delay_class *c, struct bio *bio)  in delay_bio()  argument
309 	delayed->context = dc;  in delay_bio()
313 	if (unlikely(!dc->may_delay)) {  in delay_bio()
318 	list_add_tail(&delayed->list, &dc->delayed_bios);  in delay_bio()
321 	if (delay_is_fast(dc))  in delay_bio()
322 		wake_up_process(dc->worker);  in delay_bio()
324 		queue_timeout(dc, expires);  in delay_bio()
331 	struct delay_c *dc = ti->private;  in delay_presuspend()  local
334 	dc->may_delay = false;  in delay_presuspend()
337 	if (!delay_is_fast(dc))  in delay_presuspend()
338 		del_timer_sync(&dc->delay_timer);  in delay_presuspend()
339 	flush_delayed_bios(dc, true);  in delay_presuspend()
344 	struct delay_c *dc = ti->private;  in delay_resume()  local
346 	dc->may_delay = true;  in delay_resume()
351 	struct delay_c *dc = ti->private;  in delay_map()  local
357 			c = &dc->flush;  in delay_map()
359 			c = &dc->write;  in delay_map()
361 		c = &dc->read;  in delay_map()
367 	return delay_bio(dc, c, bio);  in delay_map()
376 	struct delay_c *dc = ti->private;  in delay_status()  local
381 		DMEMIT("%u %u %u", dc->read.ops, dc->write.ops, dc->flush.ops);  in delay_status()
385 		DMEMIT_DELAY_CLASS(&dc->read);  in delay_status()
386 		if (dc->argc >= 6) {  in delay_status()
388 			DMEMIT_DELAY_CLASS(&dc->write);  in delay_status()
390 		if (dc->argc >= 9) {  in delay_status()
392 			DMEMIT_DELAY_CLASS(&dc->flush);  in delay_status()
405 	struct delay_c *dc = ti->private;  in delay_iterate_devices()  local
408 	ret = fn(ti, dc->read.dev, dc->read.start, ti->len, data);  in delay_iterate_devices()
411 	ret = fn(ti, dc->write.dev, dc->write.start, ti->len, data);  in delay_iterate_devices()
414 	ret = fn(ti, dc->flush.dev, dc->flush.start, ti->len, data);  in delay_iterate_devices()