27 	IO_WORKER_F_BOUND	= 8,	/* is doing bounded work */
60 		struct work_struct work;  member
161 						   struct io_wq_work *work)  in io_work_get_acct()  argument
163 	return io_get_acct(wqe, !(work->flags & IO_WQ_WORK_UNBOUND));  in io_work_get_acct()
249 	 * Most likely an attempt to queue unbounded work on an io_wq that  in io_wqe_create_worker()
354  * Worker will start processing some work. Move it to the busy list, if
358 			     struct io_wq_work *work)  in __io_worker_busy()  argument
368  * No work, worker going to sleep. Move to freelist, and unuse mm if we
383 static inline unsigned int io_get_work_hash(struct io_wq_work *work)  in io_get_work_hash()  argument
385 	return work->flags >> IO_WQ_HASH_SHIFT;  in io_get_work_hash()
408 	struct io_wq_work *work, *tail;  in io_get_next_work()  local
415 		work = container_of(node, struct io_wq_work, list);  in io_get_next_work()
418 		if (!io_wq_is_hashed(work)) {  in io_get_next_work()
420 			return work;  in io_get_next_work()
423 		hash = io_get_work_hash(work);  in io_get_next_work()
424 		/* all items with this hash lie in [work, tail] */  in io_get_next_work()
431 			return work;  in io_get_next_work()
442 		 * work being added and clearing the stalled bit.  in io_get_next_work()
464 				   struct io_wq_work *work)  in io_assign_current_work()  argument
466 	if (work) {  in io_assign_current_work()
472 	worker->cur_work = work;  in io_assign_current_work()
476 static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work);
487 		struct io_wq_work *work;  in io_worker_handle_work()  local
490 		 * If we got some work, mark us as busy. If we didn't, but  in io_worker_handle_work()
491 		 * the list isn't empty, it means we stalled on hashed work.  in io_worker_handle_work()
492 		 * Mark us stalled so we don't keep looking for work when we  in io_worker_handle_work()
493 		 * can't make progress, any work completion or insertion will  in io_worker_handle_work()
496 		work = io_get_next_work(acct, worker);  in io_worker_handle_work()
497 		if (work)  in io_worker_handle_work()
498 			__io_worker_busy(wqe, worker, work);  in io_worker_handle_work()
501 		if (!work)  in io_worker_handle_work()
503 		io_assign_current_work(worker, work);  in io_worker_handle_work()
509 			unsigned int hash = io_get_work_hash(work);  in io_worker_handle_work()
511 			next_hashed = wq_next_work(work);  in io_worker_handle_work()
513 			if (unlikely(do_kill) && (work->flags & IO_WQ_WORK_UNBOUND))  in io_worker_handle_work()
514 				work->flags |= IO_WQ_WORK_CANCEL;  in io_worker_handle_work()
515 			wq->do_work(work);  in io_worker_handle_work()
518 			linked = wq->free_work(work);  in io_worker_handle_work()
519 			work = next_hashed;  in io_worker_handle_work()
520 			if (!work && linked && !io_wq_is_hashed(linked)) {  in io_worker_handle_work()
521 				work = linked;  in io_worker_handle_work()
524 			io_assign_current_work(worker, work);  in io_worker_handle_work()
535 				if (!work)  in io_worker_handle_work()
539 		} while (work);  in io_worker_handle_work()
620  * running and we have work pending, wake up a free one or create a new one.
656 static bool io_wq_work_match_all(struct io_wq_work *work, void *data)  in io_wq_work_match_all()  argument
711 	schedule_work(&worker->work);  in create_worker_cont()
714 static void io_workqueue_create(struct work_struct *work)  in io_workqueue_create()  argument
716 	struct io_worker *worker = container_of(work, struct io_worker, work);  in io_workqueue_create()
760 		INIT_WORK(&worker->work, io_workqueue_create);  in create_io_worker()
761 		schedule_work(&worker->work);  in create_io_worker()
799 static void io_run_cancel(struct io_wq_work *work, struct io_wqe *wqe)  in io_run_cancel()  argument
804 		work->flags |= IO_WQ_WORK_CANCEL;  in io_run_cancel()
805 		wq->do_work(work);  in io_run_cancel()
806 		work = wq->free_work(work);  in io_run_cancel()
807 	} while (work);  in io_run_cancel()
810 static void io_wqe_insert_work(struct io_wqe *wqe, struct io_wq_work *work)  in io_wqe_insert_work()  argument
812 	struct io_wqe_acct *acct = io_work_get_acct(wqe, work);  in io_wqe_insert_work()
816 	if (!io_wq_is_hashed(work)) {  in io_wqe_insert_work()
818 		wq_list_add_tail(&work->list, &acct->work_list);  in io_wqe_insert_work()
822 	hash = io_get_work_hash(work);  in io_wqe_insert_work()
824 	wqe->hash_tail[hash] = work;  in io_wqe_insert_work()
828 	wq_list_add_after(&work->list, &tail->list, &acct->work_list);  in io_wqe_insert_work()
831 static bool io_wq_work_match_item(struct io_wq_work *work, void *data)  in io_wq_work_match_item()  argument
833 	return work == data;  in io_wq_work_match_item()
836 static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)  in io_wqe_enqueue()  argument
838 	struct io_wqe_acct *acct = io_work_get_acct(wqe, work);  in io_wqe_enqueue()
839 	unsigned work_flags = work->flags;  in io_wqe_enqueue()
847 	    (work->flags & IO_WQ_WORK_CANCEL)) {  in io_wqe_enqueue()
848 		io_run_cancel(work, wqe);  in io_wqe_enqueue()
853 	io_wqe_insert_work(wqe, work);  in io_wqe_enqueue()
875 				.data		= work,  in io_wqe_enqueue()
886 void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work)  in io_wq_enqueue()  argument
890 	io_wqe_enqueue(wqe, work);  in io_wq_enqueue()
894  * Work items that hash to the same value will not be done in parallel.
897 void io_wq_hash_work(struct io_wq_work *work, void *val)  in io_wq_hash_work()  argument
902 	work->flags |= (IO_WQ_WORK_HASHED | (bit << IO_WQ_HASH_SHIFT));  in io_wq_hash_work()
911 	 * may dereference the passed in work.  in io_wq_worker_cancel()
925 					 struct io_wq_work *work,  in io_wqe_remove_pending()  argument
928 	struct io_wqe_acct *acct = io_work_get_acct(wqe, work);  in io_wqe_remove_pending()
929 	unsigned int hash = io_get_work_hash(work);  in io_wqe_remove_pending()
932 	if (io_wq_is_hashed(work) && work == wqe->hash_tail[hash]) {  in io_wqe_remove_pending()
940 	wq_list_del(&acct->work_list, &work->list, prev);  in io_wqe_remove_pending()
949 	struct io_wq_work *work;  in io_acct_cancel_pending_work()  local
952 		work = container_of(node, struct io_wq_work, list);  in io_acct_cancel_pending_work()
953 		if (!match->fn(work, match->data))  in io_acct_cancel_pending_work()
955 		io_wqe_remove_pending(wqe, work, prev);  in io_acct_cancel_pending_work()
957 		io_run_cancel(work, wqe);  in io_acct_cancel_pending_work()
1004 	 * from there. CANCEL_OK means that the work is returned as-new,  in io_wq_cancel_cb()
1016 	 * Now check if a free (going busy) or busy worker has the work  in io_wq_cancel_cb()