59 	struct delay_c *dc = timer_container_of(dc, t, delay_timer);  in handle_delayed_timer()  local
61 	queue_work(dc->kdelayd_wq, &dc->flush_expired_bios);  in handle_delayed_timer()
64 static void queue_timeout(struct delay_c *dc, unsigned long expires)  in queue_timeout()  argument
66 	timer_reduce(&dc->delay_timer, expires);  in queue_timeout()
69 static inline bool delay_is_fast(struct delay_c *dc)  in delay_is_fast()  argument
71 	return !!dc->worker;  in delay_is_fast()
86 static void flush_delayed_bios(struct delay_c *dc, bool flush_all)  in flush_delayed_bios()  argument
95 	mutex_lock(&dc->process_bios_lock);  in flush_delayed_bios()
96 	spin_lock(&dc->delayed_bios_lock);  in flush_delayed_bios()
97 	list_replace_init(&dc->delayed_bios, &local_list);  in flush_delayed_bios()
98 	spin_unlock(&dc->delayed_bios_lock);  in flush_delayed_bios()
110 		if (!delay_is_fast(dc)) {  in flush_delayed_bios()
119 	spin_lock(&dc->delayed_bios_lock);  in flush_delayed_bios()
120 	list_splice(&local_list, &dc->delayed_bios);  in flush_delayed_bios()
121 	spin_unlock(&dc->delayed_bios_lock);  in flush_delayed_bios()
122 	mutex_unlock(&dc->process_bios_lock);  in flush_delayed_bios()
125 		queue_timeout(dc, next_expires);  in flush_delayed_bios()
132 	struct delay_c *dc = data;  in flush_worker_fn()  local
135 		flush_delayed_bios(dc, false);  in flush_worker_fn()
136 		spin_lock(&dc->delayed_bios_lock);  in flush_worker_fn()
137 		if (unlikely(list_empty(&dc->delayed_bios))) {  in flush_worker_fn()
139 			spin_unlock(&dc->delayed_bios_lock);  in flush_worker_fn()
142 			spin_unlock(&dc->delayed_bios_lock);  in flush_worker_fn()
143 			fsleep(dc->worker_sleep_us);  in flush_worker_fn()
153 	struct delay_c *dc;  in flush_expired_bios()  local
155 	dc = container_of(work, struct delay_c, flush_expired_bios);  in flush_expired_bios()
156 	flush_delayed_bios(dc, false);  in flush_expired_bios()
161 	struct delay_c *dc = ti->private;  in delay_dtr()  local
163 	if (dc->kdelayd_wq) {  in delay_dtr()
164 		timer_shutdown_sync(&dc->delay_timer);  in delay_dtr()
165 		destroy_workqueue(dc->kdelayd_wq);  in delay_dtr()
168 	if (dc->read.dev)  in delay_dtr()
169 		dm_put_device(ti, dc->read.dev);  in delay_dtr()
170 	if (dc->write.dev)  in delay_dtr()
171 		dm_put_device(ti, dc->write.dev);  in delay_dtr()
172 	if (dc->flush.dev)  in delay_dtr()
173 		dm_put_device(ti, dc->flush.dev);  in delay_dtr()
174 	if (dc->worker)  in delay_dtr()
175 		kthread_stop(dc->worker);  in delay_dtr()
177 	mutex_destroy(&dc->process_bios_lock);  in delay_dtr()
179 	kfree(dc);  in delay_dtr()
218 	struct delay_c *dc;  in delay_ctr()  local
227 	dc = kzalloc(sizeof(*dc), GFP_KERNEL);  in delay_ctr()
228 	if (!dc) {  in delay_ctr()
233 	ti->private = dc;  in delay_ctr()
234 	INIT_LIST_HEAD(&dc->delayed_bios);  in delay_ctr()
235 	mutex_init(&dc->process_bios_lock);  in delay_ctr()
236 	spin_lock_init(&dc->delayed_bios_lock);  in delay_ctr()
237 	dc->may_delay = true;  in delay_ctr()
238 	dc->argc = argc;  in delay_ctr()
240 	ret = delay_class_ctr(ti, &dc->read, argv);  in delay_ctr()
243 	min_delay = max_delay = dc->read.delay;  in delay_ctr()
246 		ret = delay_class_ctr(ti, &dc->write, argv);  in delay_ctr()
249 		ret = delay_class_ctr(ti, &dc->flush, argv);  in delay_ctr()
255 	ret = delay_class_ctr(ti, &dc->write, argv + 3);  in delay_ctr()
258 	max_delay = max(max_delay, dc->write.delay);  in delay_ctr()
259 	min_delay = min_not_zero(min_delay, dc->write.delay);  in delay_ctr()
262 		ret = delay_class_ctr(ti, &dc->flush, argv + 3);  in delay_ctr()
268 	ret = delay_class_ctr(ti, &dc->flush, argv + 6);  in delay_ctr()
271 	max_delay = max(max_delay, dc->flush.delay);  in delay_ctr()
272 	min_delay = min_not_zero(min_delay, dc->flush.delay);  in delay_ctr()
277 			dc->worker_sleep_us = 1000;  in delay_ctr()
279 			dc->worker_sleep_us = (min_delay * 1000) >> SLEEP_SHIFT;  in delay_ctr()
284 		dc->worker = kthread_run(&flush_worker_fn, dc, "dm-delay-flush-worker");  in delay_ctr()
285 		if (IS_ERR(dc->worker)) {  in delay_ctr()
286 			ret = PTR_ERR(dc->worker);  in delay_ctr()
287 			dc->worker = NULL;  in delay_ctr()
291 		timer_setup(&dc->delay_timer, handle_delayed_timer, 0);  in delay_ctr()
292 		INIT_WORK(&dc->flush_expired_bios, flush_expired_bios);  in delay_ctr()
293 		dc->kdelayd_wq = alloc_workqueue("kdelayd", WQ_MEM_RECLAIM, 0);  in delay_ctr()
294 		if (!dc->kdelayd_wq) {  in delay_ctr()
312 static int delay_bio(struct delay_c *dc, struct delay_class *c, struct bio *bio)  in delay_bio()  argument
322 	delayed->context = dc;  in delay_bio()
325 	spin_lock(&dc->delayed_bios_lock);  in delay_bio()
326 	if (unlikely(!dc->may_delay)) {  in delay_bio()
327 		spin_unlock(&dc->delayed_bios_lock);  in delay_bio()
331 	list_add_tail(&delayed->list, &dc->delayed_bios);  in delay_bio()
332 	spin_unlock(&dc->delayed_bios_lock);  in delay_bio()
334 	if (delay_is_fast(dc))  in delay_bio()
335 		wake_up_process(dc->worker);  in delay_bio()
337 		queue_timeout(dc, expires);  in delay_bio()
344 	struct delay_c *dc = ti->private;  in delay_presuspend()  local
346 	spin_lock(&dc->delayed_bios_lock);  in delay_presuspend()
347 	dc->may_delay = false;  in delay_presuspend()
348 	spin_unlock(&dc->delayed_bios_lock);  in delay_presuspend()
350 	if (!delay_is_fast(dc))  in delay_presuspend()
351 		timer_delete(&dc->delay_timer);  in delay_presuspend()
352 	flush_delayed_bios(dc, true);  in delay_presuspend()
357 	struct delay_c *dc = ti->private;  in delay_resume()  local
359 	dc->may_delay = true;  in delay_resume()
364 	struct delay_c *dc = ti->private;  in delay_map()  local
370 			c = &dc->flush;  in delay_map()
372 			c = &dc->write;  in delay_map()
374 		c = &dc->read;  in delay_map()
380 	return delay_bio(dc, c, bio);  in delay_map()
387 	struct delay_c *dc = ti->private;  in delay_report_zones()  local
388 	struct delay_class *c = &dc->read;  in delay_report_zones()
404 	struct delay_c *dc = ti->private;  in delay_status()  local
409 		DMEMIT("%u %u %u", dc->read.ops, dc->write.ops, dc->flush.ops);  in delay_status()
413 		DMEMIT_DELAY_CLASS(&dc->read);  in delay_status()
414 		if (dc->argc >= 6) {  in delay_status()
416 			DMEMIT_DELAY_CLASS(&dc->write);  in delay_status()
418 		if (dc->argc >= 9) {  in delay_status()
420 			DMEMIT_DELAY_CLASS(&dc->flush);  in delay_status()
433 	struct delay_c *dc = ti->private;  in delay_iterate_devices()  local
436 	ret = fn(ti, dc->read.dev, dc->read.start, ti->len, data);  in delay_iterate_devices()
439 	ret = fn(ti, dc->write.dev, dc->write.start, ti->len, data);  in delay_iterate_devices()
442 	ret = fn(ti, dc->flush.dev, dc->flush.start, ti->len, data);  in delay_iterate_devices()