31 	IO_WORKER_F_BOUND	= 8,	/* is doing bounded work */
65 		struct work_struct work;  member
161 						  struct io_wq_work *work)  in io_work_get_acct()  argument
163 	return io_get_acct(wq, !(work->flags & IO_WQ_WORK_UNBOUND));  in io_work_get_acct()
252  * If there's work to do, returns true with acct->lock acquired. If not,
291 		 * starting work or finishing work. In either case, if it does  in io_wq_activate_free_worker()
292 		 * to go sleep, we'll kick off a new task for this work anyway.  in io_wq_activate_free_worker()
309 	 * Most likely an attempt to queue unbounded work on an io_wq that  in io_wq_create_worker()
391 		 * work item after we canceled in io_wq_exit_workers().  in io_queue_worker_create()
428  * Worker will start processing some work. Move it to the busy list, if
442  * No work, worker going to sleep. Move to freelist.
453 static inline unsigned int io_get_work_hash(struct io_wq_work *work)  in io_get_work_hash()  argument
455 	return work->flags >> IO_WQ_HASH_SHIFT;  in io_get_work_hash()
480 	struct io_wq_work *work, *tail;  in io_get_next_work()  local
487 		work = container_of(node, struct io_wq_work, list);  in io_get_next_work()
490 		if (!io_wq_is_hashed(work)) {  in io_get_next_work()
492 			return work;  in io_get_next_work()
495 		hash = io_get_work_hash(work);  in io_get_next_work()
496 		/* all items with this hash lie in [work, tail] */  in io_get_next_work()
503 			return work;  in io_get_next_work()
516 		 * work being added and clearing the stalled bit.  in io_get_next_work()
533 				   struct io_wq_work *work)  in io_assign_current_work()  argument
535 	if (work) {  in io_assign_current_work()
541 	worker->cur_work = work;  in io_assign_current_work()
557 		struct io_wq_work *work;  in io_worker_handle_work()  local
560 		 * If we got some work, mark us as busy. If we didn't, but  in io_worker_handle_work()
561 		 * the list isn't empty, it means we stalled on hashed work.  in io_worker_handle_work()
562 		 * Mark us stalled so we don't keep looking for work when we  in io_worker_handle_work()
563 		 * can't make progress, any work completion or insertion will  in io_worker_handle_work()
566 		work = io_get_next_work(acct, worker);  in io_worker_handle_work()
568 		if (work) {  in io_worker_handle_work()
573 			 * it becomes the active work. That avoids a window  in io_worker_handle_work()
574 			 * where the work has been removed from our general  in io_worker_handle_work()
575 			 * work list, but isn't yet discoverable as the  in io_worker_handle_work()
576 			 * current work item for this worker.  in io_worker_handle_work()
579 			worker->next_work = work;  in io_worker_handle_work()
584 		io_assign_current_work(worker, work);  in io_worker_handle_work()
590 			unsigned int hash = io_get_work_hash(work);  in io_worker_handle_work()
592 			next_hashed = wq_next_work(work);  in io_worker_handle_work()
594 			if (unlikely(do_kill) && (work->flags & IO_WQ_WORK_UNBOUND))  in io_worker_handle_work()
595 				work->flags |= IO_WQ_WORK_CANCEL;  in io_worker_handle_work()
596 			wq->do_work(work);  in io_worker_handle_work()
599 			linked = wq->free_work(work);  in io_worker_handle_work()
600 			work = next_hashed;  in io_worker_handle_work()
601 			if (!work && linked && !io_wq_is_hashed(linked)) {  in io_worker_handle_work()
602 				work = linked;  in io_worker_handle_work()
605 			io_assign_current_work(worker, work);  in io_worker_handle_work()
618 		} while (work);  in io_worker_handle_work()
645 		 * If we have work to do, io_acct_run_queue() returns with  in io_wq_worker()
708  * running and we have work pending, wake up a free one or create a new one.
740 static bool io_wq_work_match_all(struct io_wq_work *work, void *data)  in io_wq_work_match_all()  argument
804 	schedule_work(&worker->work);  in create_worker_cont()
807 static void io_workqueue_create(struct work_struct *work)  in io_workqueue_create()  argument
809 	struct io_worker *worker = container_of(work, struct io_worker, work);  in io_workqueue_create()
850 		INIT_WORK(&worker->work, io_workqueue_create);  in create_io_worker()
851 		schedule_work(&worker->work);  in create_io_worker()
889 static void io_run_cancel(struct io_wq_work *work, struct io_wq *wq)  in io_run_cancel()  argument
892 		work->flags |= IO_WQ_WORK_CANCEL;  in io_run_cancel()
893 		wq->do_work(work);  in io_run_cancel()
894 		work = wq->free_work(work);  in io_run_cancel()
895 	} while (work);  in io_run_cancel()
898 static void io_wq_insert_work(struct io_wq *wq, struct io_wq_work *work)  in io_wq_insert_work()  argument
900 	struct io_wq_acct *acct = io_work_get_acct(wq, work);  in io_wq_insert_work()
904 	if (!io_wq_is_hashed(work)) {  in io_wq_insert_work()
906 		wq_list_add_tail(&work->list, &acct->work_list);  in io_wq_insert_work()
910 	hash = io_get_work_hash(work);  in io_wq_insert_work()
912 	wq->hash_tail[hash] = work;  in io_wq_insert_work()
916 	wq_list_add_after(&work->list, &tail->list, &acct->work_list);  in io_wq_insert_work()
919 static bool io_wq_work_match_item(struct io_wq_work *work, void *data)  in io_wq_work_match_item()  argument
921 	return work == data;  in io_wq_work_match_item()
924 void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work)  in io_wq_enqueue()  argument
926 	struct io_wq_acct *acct = io_work_get_acct(wq, work);  in io_wq_enqueue()
928 	unsigned work_flags = work->flags;  in io_wq_enqueue()
936 	    (work->flags & IO_WQ_WORK_CANCEL)) {  in io_wq_enqueue()
937 		io_run_cancel(work, wq);  in io_wq_enqueue()
942 	io_wq_insert_work(wq, work);  in io_wq_enqueue()
967 		match.data		= work,  in io_wq_enqueue()
975  * Work items that hash to the same value will not be done in parallel.
978 void io_wq_hash_work(struct io_wq_work *work, void *val)  in io_wq_hash_work()  argument
983 	work->flags |= (IO_WQ_WORK_HASHED | (bit << IO_WQ_HASH_SHIFT));  in io_wq_hash_work()
988 				  struct io_wq_work *work)  in __io_wq_worker_cancel()  argument
990 	if (work && match->fn(work, match->data)) {  in __io_wq_worker_cancel()
991 		work->flags |= IO_WQ_WORK_CANCEL;  in __io_wq_worker_cancel()
1005 	 * may dereference the passed in work.  in io_wq_worker_cancel()
1017 					 struct io_wq_work *work,  in io_wq_remove_pending()  argument
1020 	struct io_wq_acct *acct = io_work_get_acct(wq, work);  in io_wq_remove_pending()
1021 	unsigned int hash = io_get_work_hash(work);  in io_wq_remove_pending()
1024 	if (io_wq_is_hashed(work) && work == wq->hash_tail[hash]) {  in io_wq_remove_pending()
1032 	wq_list_del(&acct->work_list, &work->list, prev);  in io_wq_remove_pending()
1040 	struct io_wq_work *work;  in io_acct_cancel_pending_work()  local
1044 		work = container_of(node, struct io_wq_work, list);  in io_acct_cancel_pending_work()
1045 		if (!match->fn(work, match->data))  in io_acct_cancel_pending_work()
1047 		io_wq_remove_pending(wq, work, prev);  in io_acct_cancel_pending_work()
1049 		io_run_cancel(work, wq);  in io_acct_cancel_pending_work()
1094 	 * from there. CANCEL_OK means that the work is returned as-new,  in io_wq_cancel_cb()
1097 	 * Then check if a free (going busy) or busy worker has the work  in io_wq_cancel_cb()
1103 	 * we'll find a work item regardless of state.  in io_wq_cancel_cb()