1 // SPDX-License-Identifier: GPL-2.0
4  * Copyright (c) 2023-2024 DataDirect Networks.
17 		 "Enable userspace communication through io-uring");
39 	pdu->ent = ring_ent;  in uring_cmd_set_ring_ent()
47 	return pdu->ent;  in uring_cmd_to_ring_ent()
52 	struct fuse_ring *ring = queue->ring;  in fuse_uring_flush_bg()
53 	struct fuse_conn *fc = ring->fc;  in fuse_uring_flush_bg()
55 	lockdep_assert_held(&queue->lock);  in fuse_uring_flush_bg()
56 	lockdep_assert_held(&fc->bg_lock);  in fuse_uring_flush_bg()
61 	 * eliminates the need for remote queue wake-ups when global  in fuse_uring_flush_bg()
64 	while ((fc->active_background < fc->max_background ||  in fuse_uring_flush_bg()
65 		!queue->active_background) &&  in fuse_uring_flush_bg()
66 	       (!list_empty(&queue->fuse_req_bg_queue))) {  in fuse_uring_flush_bg()
69 		req = list_first_entry(&queue->fuse_req_bg_queue,  in fuse_uring_flush_bg()
71 		fc->active_background++;  in fuse_uring_flush_bg()
72 		queue->active_background++;  in fuse_uring_flush_bg()
74 		list_move_tail(&req->list, &queue->fuse_req_queue);  in fuse_uring_flush_bg()
81 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_req_end()
82 	struct fuse_ring *ring = queue->ring;  in fuse_uring_req_end()
83 	struct fuse_conn *fc = ring->fc;  in fuse_uring_req_end()
85 	lockdep_assert_not_held(&queue->lock);  in fuse_uring_req_end()
86 	spin_lock(&queue->lock);  in fuse_uring_req_end()
87 	ent->fuse_req = NULL;  in fuse_uring_req_end()
88 	if (test_bit(FR_BACKGROUND, &req->flags)) {  in fuse_uring_req_end()
89 		queue->active_background--;  in fuse_uring_req_end()
90 		spin_lock(&fc->bg_lock);  in fuse_uring_req_end()
92 		spin_unlock(&fc->bg_lock);  in fuse_uring_req_end()
95 	spin_unlock(&queue->lock);  in fuse_uring_req_end()
98 		req->out.h.error = error;  in fuse_uring_req_end()
100 	clear_bit(FR_SENT, &req->flags);  in fuse_uring_req_end()
110 	spin_lock(&queue->lock);  in fuse_uring_abort_end_queue_requests()
111 	list_for_each_entry(req, &queue->fuse_req_queue, list)  in fuse_uring_abort_end_queue_requests()
112 		clear_bit(FR_PENDING, &req->flags);  in fuse_uring_abort_end_queue_requests()
113 	list_splice_init(&queue->fuse_req_queue, &req_list);  in fuse_uring_abort_end_queue_requests()
114 	spin_unlock(&queue->lock);  in fuse_uring_abort_end_queue_requests()
116 	/* must not hold queue lock to avoid order issues with fi->lock */  in fuse_uring_abort_end_queue_requests()
124 	struct fuse_conn *fc = ring->fc;  in fuse_uring_abort_end_requests()
126 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_abort_end_requests()
127 		queue = READ_ONCE(ring->queues[qid]);  in fuse_uring_abort_end_requests()
131 		queue->stopped = true;  in fuse_uring_abort_end_requests()
133 		WARN_ON_ONCE(ring->fc->max_background != UINT_MAX);  in fuse_uring_abort_end_requests()
134 		spin_lock(&queue->lock);  in fuse_uring_abort_end_requests()
135 		spin_lock(&fc->bg_lock);  in fuse_uring_abort_end_requests()
137 		spin_unlock(&fc->bg_lock);  in fuse_uring_abort_end_requests()
138 		spin_unlock(&queue->lock);  in fuse_uring_abort_end_requests()
145 	struct fuse_ring *ring = fc->ring;  in fuse_uring_request_expired()
152 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_request_expired()
153 		queue = READ_ONCE(ring->queues[qid]);  in fuse_uring_request_expired()
157 		spin_lock(&queue->lock);  in fuse_uring_request_expired()
158 		if (fuse_request_expired(fc, &queue->fuse_req_queue) ||  in fuse_uring_request_expired()
159 		    fuse_request_expired(fc, &queue->fuse_req_bg_queue) ||  in fuse_uring_request_expired()
160 		    fuse_fpq_processing_expired(fc, queue->fpq.processing)) {  in fuse_uring_request_expired()
161 			spin_unlock(&queue->lock);  in fuse_uring_request_expired()
164 		spin_unlock(&queue->lock);  in fuse_uring_request_expired()
172 	struct fuse_ring *ring = fc->ring;  in fuse_uring_destruct()
178 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_destruct()
179 		struct fuse_ring_queue *queue = ring->queues[qid];  in fuse_uring_destruct()
185 		WARN_ON(!list_empty(&queue->ent_avail_queue));  in fuse_uring_destruct()
186 		WARN_ON(!list_empty(&queue->ent_w_req_queue));  in fuse_uring_destruct()
187 		WARN_ON(!list_empty(&queue->ent_commit_queue));  in fuse_uring_destruct()
188 		WARN_ON(!list_empty(&queue->ent_in_userspace));  in fuse_uring_destruct()
190 		list_for_each_entry_safe(ent, next, &queue->ent_released,  in fuse_uring_destruct()
192 			list_del_init(&ent->list);  in fuse_uring_destruct()
196 		kfree(queue->fpq.processing);  in fuse_uring_destruct()
198 		ring->queues[qid] = NULL;  in fuse_uring_destruct()
201 	kfree(ring->queues);  in fuse_uring_destruct()
203 	fc->ring = NULL;  in fuse_uring_destruct()
207  * Basic ring setup for this connection based on the provided configuration
216 	ring = kzalloc(sizeof(*fc->ring), GFP_KERNEL_ACCOUNT);  in fuse_uring_create()
220 	ring->queues = kcalloc(nr_queues, sizeof(struct fuse_ring_queue *),  in fuse_uring_create()
222 	if (!ring->queues)  in fuse_uring_create()
225 	max_payload_size = max(FUSE_MIN_READ_BUFFER, fc->max_write);  in fuse_uring_create()
226 	max_payload_size = max(max_payload_size, fc->max_pages * PAGE_SIZE);  in fuse_uring_create()
228 	spin_lock(&fc->lock);  in fuse_uring_create()
229 	if (fc->ring) {  in fuse_uring_create()
231 		spin_unlock(&fc->lock);  in fuse_uring_create()
232 		res = fc->ring;  in fuse_uring_create()
236 	init_waitqueue_head(&ring->stop_waitq);  in fuse_uring_create()
238 	ring->nr_queues = nr_queues;  in fuse_uring_create()
239 	ring->fc = fc;  in fuse_uring_create()
240 	ring->max_payload_sz = max_payload_size;  in fuse_uring_create()
241 	smp_store_release(&fc->ring, ring);  in fuse_uring_create()
243 	spin_unlock(&fc->lock);  in fuse_uring_create()
247 	kfree(ring->queues);  in fuse_uring_create()
255 	struct fuse_conn *fc = ring->fc;  in fuse_uring_create_queue()
268 	queue->qid = qid;  in fuse_uring_create_queue()
269 	queue->ring = ring;  in fuse_uring_create_queue()
270 	spin_lock_init(&queue->lock);  in fuse_uring_create_queue()
272 	INIT_LIST_HEAD(&queue->ent_avail_queue);  in fuse_uring_create_queue()
273 	INIT_LIST_HEAD(&queue->ent_commit_queue);  in fuse_uring_create_queue()
274 	INIT_LIST_HEAD(&queue->ent_w_req_queue);  in fuse_uring_create_queue()
275 	INIT_LIST_HEAD(&queue->ent_in_userspace);  in fuse_uring_create_queue()
276 	INIT_LIST_HEAD(&queue->fuse_req_queue);  in fuse_uring_create_queue()
277 	INIT_LIST_HEAD(&queue->fuse_req_bg_queue);  in fuse_uring_create_queue()
278 	INIT_LIST_HEAD(&queue->ent_released);  in fuse_uring_create_queue()
280 	queue->fpq.processing = pq;  in fuse_uring_create_queue()
281 	fuse_pqueue_init(&queue->fpq);  in fuse_uring_create_queue()
283 	spin_lock(&fc->lock);  in fuse_uring_create_queue()
284 	if (ring->queues[qid]) {  in fuse_uring_create_queue()
285 		spin_unlock(&fc->lock);  in fuse_uring_create_queue()
286 		kfree(queue->fpq.processing);  in fuse_uring_create_queue()
288 		return ring->queues[qid];  in fuse_uring_create_queue()
294 	WRITE_ONCE(ring->queues[qid], queue);  in fuse_uring_create_queue()
295 	spin_unlock(&fc->lock);  in fuse_uring_create_queue()
302 	clear_bit(FR_SENT, &req->flags);  in fuse_uring_stop_fuse_req_end()
303 	req->out.h.error = -ECONNABORTED;  in fuse_uring_stop_fuse_req_end()
315 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_entry_teardown()
317 	spin_lock(&queue->lock);  in fuse_uring_entry_teardown()
318 	cmd = ent->cmd;  in fuse_uring_entry_teardown()
319 	ent->cmd = NULL;  in fuse_uring_entry_teardown()
320 	req = ent->fuse_req;  in fuse_uring_entry_teardown()
321 	ent->fuse_req = NULL;  in fuse_uring_entry_teardown()
323 		/* remove entry from queue->fpq->processing */  in fuse_uring_entry_teardown()
324 		list_del_init(&req->list);  in fuse_uring_entry_teardown()
329 	 * pointer access of entries through IO_URING_F_CANCEL - there is a risk  in fuse_uring_entry_teardown()
333 	list_move(&ent->list, &queue->ent_released);  in fuse_uring_entry_teardown()
334 	ent->state = FRRS_RELEASED;  in fuse_uring_entry_teardown()
335 	spin_unlock(&queue->lock);  in fuse_uring_entry_teardown()
338 		io_uring_cmd_done(cmd, -ENOTCONN, 0, IO_URING_F_UNLOCKED);  in fuse_uring_entry_teardown()
348 	struct fuse_ring *ring = queue->ring;  in fuse_uring_stop_list_entries()
353 	spin_lock(&queue->lock);  in fuse_uring_stop_list_entries()
355 		if (ent->state != exp_state) {  in fuse_uring_stop_list_entries()
357 				queue->qid, ent->state, exp_state);  in fuse_uring_stop_list_entries()
361 		ent->state = FRRS_TEARDOWN;  in fuse_uring_stop_list_entries()
362 		list_move(&ent->list, &to_teardown);  in fuse_uring_stop_list_entries()
364 	spin_unlock(&queue->lock);  in fuse_uring_stop_list_entries()
369 		queue_refs = atomic_dec_return(&ring->queue_refs);  in fuse_uring_stop_list_entries()
376 	fuse_uring_stop_list_entries(&queue->ent_in_userspace, queue,  in fuse_uring_teardown_entries()
378 	fuse_uring_stop_list_entries(&queue->ent_avail_queue, queue,  in fuse_uring_teardown_entries()
390 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_log_ent_state()
391 		struct fuse_ring_queue *queue = ring->queues[qid];  in fuse_uring_log_ent_state()
396 		spin_lock(&queue->lock);  in fuse_uring_log_ent_state()
401 		list_for_each_entry(ent, &queue->ent_w_req_queue, list) {  in fuse_uring_log_ent_state()
402 			pr_info(" ent-req-queue ring=%p qid=%d ent=%p state=%d\n",  in fuse_uring_log_ent_state()
403 				ring, qid, ent, ent->state);  in fuse_uring_log_ent_state()
405 		list_for_each_entry(ent, &queue->ent_commit_queue, list) {  in fuse_uring_log_ent_state()
406 			pr_info(" ent-commit-queue ring=%p qid=%d ent=%p state=%d\n",  in fuse_uring_log_ent_state()
407 				ring, qid, ent, ent->state);  in fuse_uring_log_ent_state()
409 		spin_unlock(&queue->lock);  in fuse_uring_log_ent_state()
411 	ring->stop_debug_log = 1;  in fuse_uring_log_ent_state()
421 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_async_stop_queues()
422 		struct fuse_ring_queue *queue = READ_ONCE(ring->queues[qid]);  in fuse_uring_async_stop_queues()
433 	 * or on the way to userspace - we could handle that with conditions in  in fuse_uring_async_stop_queues()
437 	if (atomic_read(&ring->queue_refs) > 0) {  in fuse_uring_async_stop_queues()
439 			       ring->teardown_time + FUSE_URING_TEARDOWN_TIMEOUT))  in fuse_uring_async_stop_queues()
442 		schedule_delayed_work(&ring->async_teardown_work,  in fuse_uring_async_stop_queues()
445 		wake_up_all(&ring->stop_waitq);  in fuse_uring_async_stop_queues()
456 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_stop_queues()
457 		struct fuse_ring_queue *queue = READ_ONCE(ring->queues[qid]);  in fuse_uring_stop_queues()
465 	if (atomic_read(&ring->queue_refs) > 0) {  in fuse_uring_stop_queues()
466 		ring->teardown_time = jiffies;  in fuse_uring_stop_queues()
467 		INIT_DELAYED_WORK(&ring->async_teardown_work,  in fuse_uring_stop_queues()
469 		schedule_delayed_work(&ring->async_teardown_work,  in fuse_uring_stop_queues()
472 		wake_up_all(&ring->stop_waitq);  in fuse_uring_stop_queues()
490 	 * direct access on ent - it must not be destructed as long as  in fuse_uring_cancel()
493 	queue = ent->queue;  in fuse_uring_cancel()
494 	spin_lock(&queue->lock);  in fuse_uring_cancel()
495 	if (ent->state == FRRS_AVAILABLE) {  in fuse_uring_cancel()
496 		ent->state = FRRS_USERSPACE;  in fuse_uring_cancel()
497 		list_move(&ent->list, &queue->ent_in_userspace);  in fuse_uring_cancel()
499 		ent->cmd = NULL;  in fuse_uring_cancel()
501 	spin_unlock(&queue->lock);  in fuse_uring_cancel()
505 		io_uring_cmd_done(cmd, -ENOTCONN, 0, issue_flags);  in fuse_uring_cancel()
525 	err = -EINVAL;  in fuse_uring_out_header_has_err()
526 	if (oh->unique == 0) {  in fuse_uring_out_header_has_err()
527 		/* Not supported through io-uring yet */  in fuse_uring_out_header_has_err()
528 		pr_warn_once("notify through fuse-io-uring not supported\n");  in fuse_uring_out_header_has_err()
532 	if (oh->error <= -ERESTARTSYS || oh->error > 0)  in fuse_uring_out_header_has_err()
535 	if (oh->error) {  in fuse_uring_out_header_has_err()
536 		err = oh->error;  in fuse_uring_out_header_has_err()
540 	err = -ENOENT;  in fuse_uring_out_header_has_err()
541 	if ((oh->unique & ~FUSE_INT_REQ_BIT) != req->in.h.unique) {  in fuse_uring_out_header_has_err()
543 				    req->in.h.unique,  in fuse_uring_out_header_has_err()
544 				    oh->unique & ~FUSE_INT_REQ_BIT);  in fuse_uring_out_header_has_err()
550 	 * XXX: Not supported through fuse-io-uring yet, it should not even  in fuse_uring_out_header_has_err()
551 	 *      find the request - should not happen.  in fuse_uring_out_header_has_err()
553 	WARN_ON_ONCE(oh->unique & FUSE_INT_REQ_BIT);  in fuse_uring_out_header_has_err()
565 	struct fuse_args *args = req->args;  in fuse_uring_copy_from_ring()
570 	err = copy_from_user(&ring_in_out, &ent->headers->ring_ent_in_out,  in fuse_uring_copy_from_ring()
573 		return -EFAULT;  in fuse_uring_copy_from_ring()
575 	err = import_ubuf(ITER_SOURCE, ent->payload, ring->max_payload_sz,  in fuse_uring_copy_from_ring()
594 	struct fuse_args *args = req->args;  in fuse_uring_args_to_ring()
595 	struct fuse_in_arg *in_args = args->in_args;  in fuse_uring_args_to_ring()
596 	int num_args = args->in_numargs;  in fuse_uring_args_to_ring()
601 		.commit_id = req->in.h.unique,  in fuse_uring_args_to_ring()
604 	err = import_ubuf(ITER_DEST, ent->payload, ring->max_payload_sz, &iter);  in fuse_uring_args_to_ring()
619 		if (args->in_args[0].size > 0) {  in fuse_uring_args_to_ring()
620 			err = copy_to_user(&ent->headers->op_in, in_args->value,  in fuse_uring_args_to_ring()
621 					   in_args->size);  in fuse_uring_args_to_ring()
625 				return -EFAULT;  in fuse_uring_args_to_ring()
629 		num_args--;  in fuse_uring_args_to_ring()
633 	err = fuse_copy_args(&cs, num_args, args->in_pages,  in fuse_uring_args_to_ring()
641 	err = copy_to_user(&ent->headers->ring_ent_in_out, &ent_in_out,  in fuse_uring_args_to_ring()
643 	return err ? -EFAULT : 0;  in fuse_uring_args_to_ring()
649 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_copy_to_ring()
650 	struct fuse_ring *ring = queue->ring;  in fuse_uring_copy_to_ring()
653 	err = -EIO;  in fuse_uring_copy_to_ring()
654 	if (WARN_ON(ent->state != FRRS_FUSE_REQ)) {  in fuse_uring_copy_to_ring()
655 		pr_err("qid=%d ring-req=%p invalid state %d on send\n",  in fuse_uring_copy_to_ring()
656 		       queue->qid, ent, ent->state);  in fuse_uring_copy_to_ring()
660 	err = -EINVAL;  in fuse_uring_copy_to_ring()
661 	if (WARN_ON(req->in.h.unique == 0))  in fuse_uring_copy_to_ring()
672 	err = copy_to_user(&ent->headers->in_out, &req->in.h,  in fuse_uring_copy_to_ring()
673 			   sizeof(req->in.h));  in fuse_uring_copy_to_ring()
675 		err = -EFAULT;  in fuse_uring_copy_to_ring()
689 		set_bit(FR_SENT, &req->flags);  in fuse_uring_prepare_send()
705 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_send_next_to_ring()
713 	spin_lock(&queue->lock);  in fuse_uring_send_next_to_ring()
714 	cmd = ent->cmd;  in fuse_uring_send_next_to_ring()
715 	ent->cmd = NULL;  in fuse_uring_send_next_to_ring()
716 	ent->state = FRRS_USERSPACE;  in fuse_uring_send_next_to_ring()
717 	list_move(&ent->list, &queue->ent_in_userspace);  in fuse_uring_send_next_to_ring()
718 	spin_unlock(&queue->lock);  in fuse_uring_send_next_to_ring()
730 	WARN_ON_ONCE(!ent->cmd);  in fuse_uring_ent_avail()
731 	list_move(&ent->list, &queue->ent_avail_queue);  in fuse_uring_ent_avail()
732 	ent->state = FRRS_AVAILABLE;  in fuse_uring_ent_avail()
739 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_add_to_pq()
740 	struct fuse_pqueue *fpq = &queue->fpq;  in fuse_uring_add_to_pq()
743 	req->ring_entry = ent;  in fuse_uring_add_to_pq()
744 	hash = fuse_req_hash(req->in.h.unique);  in fuse_uring_add_to_pq()
745 	list_move_tail(&req->list, &fpq->processing[hash]);  in fuse_uring_add_to_pq()
754 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_add_req_to_ring_ent()
756 	lockdep_assert_held(&queue->lock);  in fuse_uring_add_req_to_ring_ent()
758 	if (WARN_ON_ONCE(ent->state != FRRS_AVAILABLE &&  in fuse_uring_add_req_to_ring_ent()
759 			 ent->state != FRRS_COMMIT)) {  in fuse_uring_add_req_to_ring_ent()
760 		pr_warn("%s qid=%d state=%d\n", __func__, ent->queue->qid,  in fuse_uring_add_req_to_ring_ent()
761 			ent->state);  in fuse_uring_add_req_to_ring_ent()
764 	clear_bit(FR_PENDING, &req->flags);  in fuse_uring_add_req_to_ring_ent()
765 	ent->fuse_req = req;  in fuse_uring_add_req_to_ring_ent()
766 	ent->state = FRRS_FUSE_REQ;  in fuse_uring_add_req_to_ring_ent()
767 	list_move(&ent->list, &queue->ent_w_req_queue);  in fuse_uring_add_req_to_ring_ent()
773 	__must_hold(&queue->lock)  in fuse_uring_ent_assign_req()
776 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_ent_assign_req()
777 	struct list_head *req_queue = &queue->fuse_req_queue;  in fuse_uring_ent_assign_req()
779 	lockdep_assert_held(&queue->lock);  in fuse_uring_ent_assign_req()
797 	struct fuse_ring *ring = ent->queue->ring;  in fuse_uring_commit()
798 	struct fuse_conn *fc = ring->fc;  in fuse_uring_commit()
801 	err = copy_from_user(&req->out.h, &ent->headers->in_out,  in fuse_uring_commit()
802 			     sizeof(req->out.h));  in fuse_uring_commit()
804 		req->out.h.error = -EFAULT;  in fuse_uring_commit()
808 	err = fuse_uring_out_header_has_err(&req->out.h, req, fc);  in fuse_uring_commit()
810 		/* req->out.h.error already set */  in fuse_uring_commit()
830 	spin_lock(&queue->lock);  in fuse_uring_next_fuse_req()
833 	spin_unlock(&queue->lock);  in fuse_uring_next_fuse_req()
844 	struct fuse_ring_queue *queue = ent->queue;  in fuse_ring_ent_set_commit()
846 	lockdep_assert_held(&queue->lock);  in fuse_ring_ent_set_commit()
848 	if (WARN_ON_ONCE(ent->state != FRRS_USERSPACE))  in fuse_ring_ent_set_commit()
849 		return -EIO;  in fuse_ring_ent_set_commit()
851 	ent->state = FRRS_COMMIT;  in fuse_ring_ent_set_commit()
852 	list_move(&ent->list, &queue->ent_commit_queue);  in fuse_ring_ent_set_commit()
861 	const struct fuse_uring_cmd_req *cmd_req = io_uring_sqe_cmd(cmd->sqe);  in fuse_uring_commit_fetch()
864 	struct fuse_ring *ring = fc->ring;  in fuse_uring_commit_fetch()
866 	uint64_t commit_id = READ_ONCE(cmd_req->commit_id);  in fuse_uring_commit_fetch()
867 	unsigned int qid = READ_ONCE(cmd_req->qid);  in fuse_uring_commit_fetch()
871 	err = -ENOTCONN;  in fuse_uring_commit_fetch()
875 	if (qid >= ring->nr_queues)  in fuse_uring_commit_fetch()
876 		return -EINVAL;  in fuse_uring_commit_fetch()
878 	queue = ring->queues[qid];  in fuse_uring_commit_fetch()
881 	fpq = &queue->fpq;  in fuse_uring_commit_fetch()
883 	if (!READ_ONCE(fc->connected) || READ_ONCE(queue->stopped))  in fuse_uring_commit_fetch()
886 	spin_lock(&queue->lock);  in fuse_uring_commit_fetch()
887 	/* Find a request based on the unique ID of the fuse request  in fuse_uring_commit_fetch()
893 	err = -ENOENT;  in fuse_uring_commit_fetch()
895 		pr_info("qid=%d commit_id %llu not found\n", queue->qid,  in fuse_uring_commit_fetch()
897 		spin_unlock(&queue->lock);  in fuse_uring_commit_fetch()
900 	list_del_init(&req->list);  in fuse_uring_commit_fetch()
901 	ent = req->ring_entry;  in fuse_uring_commit_fetch()
902 	req->ring_entry = NULL;  in fuse_uring_commit_fetch()
907 				    queue->qid, commit_id, ent->state);  in fuse_uring_commit_fetch()
908 		spin_unlock(&queue->lock);  in fuse_uring_commit_fetch()
909 		req->out.h.error = err;  in fuse_uring_commit_fetch()
910 		clear_bit(FR_SENT, &req->flags);  in fuse_uring_commit_fetch()
915 	ent->cmd = cmd;  in fuse_uring_commit_fetch()
916 	spin_unlock(&queue->lock);  in fuse_uring_commit_fetch()
924 	 * fuse requests would otherwise not get processed - committing  in fuse_uring_commit_fetch()
938 	for (qid = 0; qid < ring->nr_queues && ready; qid++) {  in is_ring_ready()
942 		queue = ring->queues[qid];  in is_ring_ready()
948 		spin_lock(&queue->lock);  in is_ring_ready()
949 		if (list_empty(&queue->ent_avail_queue))  in is_ring_ready()
951 		spin_unlock(&queue->lock);  in is_ring_ready()
964 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_do_register()
965 	struct fuse_ring *ring = queue->ring;  in fuse_uring_do_register()
966 	struct fuse_conn *fc = ring->fc;  in fuse_uring_do_register()
967 	struct fuse_iqueue *fiq = &fc->iq;  in fuse_uring_do_register()  local
971 	spin_lock(&queue->lock);  in fuse_uring_do_register()
972 	ent->cmd = cmd;  in fuse_uring_do_register()
974 	spin_unlock(&queue->lock);  in fuse_uring_do_register()
976 	if (!ring->ready) {  in fuse_uring_do_register()
977 		bool ready = is_ring_ready(ring, queue->qid);  in fuse_uring_do_register()
980 			WRITE_ONCE(fiq->ops, &fuse_io_uring_ops);  in fuse_uring_do_register()
981 			WRITE_ONCE(ring->ready, true);  in fuse_uring_do_register()
982 			wake_up_all(&fc->blocked_waitq);  in fuse_uring_do_register()
988  * sqe->addr is a ptr to an iovec array, iov[0] has the headers, iov[1]
994 	struct iovec __user *uiov = u64_to_user_ptr(READ_ONCE(sqe->addr));  in fuse_uring_get_iovec_from_sqe()
998 	if (sqe->len != FUSE_URING_IOV_SEGS)  in fuse_uring_get_iovec_from_sqe()
999 		return -EINVAL;  in fuse_uring_get_iovec_from_sqe()
1017 	struct fuse_ring *ring = queue->ring;  in fuse_uring_create_ring_ent()
1023 	err = fuse_uring_get_iovec_from_sqe(cmd->sqe, iov);  in fuse_uring_create_ring_ent()
1030 	err = -EINVAL;  in fuse_uring_create_ring_ent()
1037 	if (payload_size < ring->max_payload_sz) {  in fuse_uring_create_ring_ent()
1043 	err = -ENOMEM;  in fuse_uring_create_ring_ent()
1048 	INIT_LIST_HEAD(&ent->list);  in fuse_uring_create_ring_ent()
1050 	ent->queue = queue;  in fuse_uring_create_ring_ent()
1051 	ent->headers = iov[0].iov_base;  in fuse_uring_create_ring_ent()
1052 	ent->payload = iov[1].iov_base;  in fuse_uring_create_ring_ent()
1054 	atomic_inc(&ring->queue_refs);  in fuse_uring_create_ring_ent()
1065 	const struct fuse_uring_cmd_req *cmd_req = io_uring_sqe_cmd(cmd->sqe);  in fuse_uring_register()
1066 	struct fuse_ring *ring = smp_load_acquire(&fc->ring);  in fuse_uring_register()
1070 	unsigned int qid = READ_ONCE(cmd_req->qid);  in fuse_uring_register()
1072 	err = -ENOMEM;  in fuse_uring_register()
1079 	if (qid >= ring->nr_queues) {  in fuse_uring_register()
1081 		return -EINVAL;  in fuse_uring_register()
1084 	queue = ring->queues[qid];  in fuse_uring_register()
1113 	u32 cmd_op = cmd->cmd_op;  in fuse_uring_cmd()
1123 		return -EINVAL;  in fuse_uring_cmd()
1125 	fud = fuse_get_dev(cmd->file);  in fuse_uring_cmd()
1128 		return -ENOTCONN;  in fuse_uring_cmd()
1130 	fc = fud->fc;  in fuse_uring_cmd()
1132 	/* Once a connection has io-uring enabled on it, it can't be disabled */  in fuse_uring_cmd()
1133 	if (!enable_uring && !fc->io_uring) {  in fuse_uring_cmd()
1134 		pr_info_ratelimited("fuse-io-uring is disabled\n");  in fuse_uring_cmd()
1135 		return -EOPNOTSUPP;  in fuse_uring_cmd()
1138 	if (fc->aborted)  in fuse_uring_cmd()
1139 		return -ECONNABORTED;  in fuse_uring_cmd()
1140 	if (!fc->connected)  in fuse_uring_cmd()
1141 		return -ENOTCONN;  in fuse_uring_cmd()
1147 	if (!fc->initialized)  in fuse_uring_cmd()
1148 		return -EAGAIN;  in fuse_uring_cmd()
1156 			fc->io_uring = 0;  in fuse_uring_cmd()
1157 			wake_up_all(&fc->blocked_waitq);  in fuse_uring_cmd()
1170 		return -EINVAL;  in fuse_uring_cmd()
1173 	return -EIOCBQUEUED;  in fuse_uring_cmd()
1179 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_send()
1181 	spin_lock(&queue->lock);  in fuse_uring_send()
1182 	ent->state = FRRS_USERSPACE;  in fuse_uring_send()
1183 	list_move(&ent->list, &queue->ent_in_userspace);  in fuse_uring_send()
1184 	ent->cmd = NULL;  in fuse_uring_send()
1185 	spin_unlock(&queue->lock);  in fuse_uring_send()
1191  * This prepares and sends the ring request in fuse-uring task context.
1192  * User buffers are not mapped yet - the application does not have permission
1193  * to write to it - this has to be executed in ring task context.
1199 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_send_in_task()
1203 		err = fuse_uring_prepare_send(ent, ent->fuse_req);  in fuse_uring_send_in_task()
1209 		err = -ECANCELED;  in fuse_uring_send_in_task()
1222 	if (WARN_ONCE(qid >= ring->nr_queues,  in fuse_uring_task_to_queue()
1224 		      ring->nr_queues))  in fuse_uring_task_to_queue()
1227 	queue = ring->queues[qid];  in fuse_uring_task_to_queue()
1235 	struct io_uring_cmd *cmd = ent->cmd;  in fuse_uring_dispatch_ent()
1242 void fuse_uring_queue_fuse_req(struct fuse_iqueue *fiq, struct fuse_req *req)  in fuse_uring_queue_fuse_req()  argument
1244 	struct fuse_conn *fc = req->fm->fc;  in fuse_uring_queue_fuse_req()
1245 	struct fuse_ring *ring = fc->ring;  in fuse_uring_queue_fuse_req()
1250 	err = -EINVAL;  in fuse_uring_queue_fuse_req()
1255 	if (req->in.h.opcode != FUSE_NOTIFY_REPLY)  in fuse_uring_queue_fuse_req()
1256 		req->in.h.unique = fuse_get_unique(fiq);  in fuse_uring_queue_fuse_req()
1258 	spin_lock(&queue->lock);  in fuse_uring_queue_fuse_req()
1259 	err = -ENOTCONN;  in fuse_uring_queue_fuse_req()
1260 	if (unlikely(queue->stopped))  in fuse_uring_queue_fuse_req()
1263 	set_bit(FR_URING, &req->flags);  in fuse_uring_queue_fuse_req()
1264 	req->ring_queue = queue;  in fuse_uring_queue_fuse_req()
1265 	ent = list_first_entry_or_null(&queue->ent_avail_queue,  in fuse_uring_queue_fuse_req()
1270 		list_add_tail(&req->list, &queue->fuse_req_queue);  in fuse_uring_queue_fuse_req()
1271 	spin_unlock(&queue->lock);  in fuse_uring_queue_fuse_req()
1279 	spin_unlock(&queue->lock);  in fuse_uring_queue_fuse_req()
1281 	req->out.h.error = err;  in fuse_uring_queue_fuse_req()
1282 	clear_bit(FR_PENDING, &req->flags);  in fuse_uring_queue_fuse_req()
1288 	struct fuse_conn *fc = req->fm->fc;  in fuse_uring_queue_bq_req()
1289 	struct fuse_ring *ring = fc->ring;  in fuse_uring_queue_bq_req()
1297 	spin_lock(&queue->lock);  in fuse_uring_queue_bq_req()
1298 	if (unlikely(queue->stopped)) {  in fuse_uring_queue_bq_req()
1299 		spin_unlock(&queue->lock);  in fuse_uring_queue_bq_req()
1303 	set_bit(FR_URING, &req->flags);  in fuse_uring_queue_bq_req()
1304 	req->ring_queue = queue;  in fuse_uring_queue_bq_req()
1305 	list_add_tail(&req->list, &queue->fuse_req_bg_queue);  in fuse_uring_queue_bq_req()
1307 	ent = list_first_entry_or_null(&queue->ent_avail_queue,  in fuse_uring_queue_bq_req()
1309 	spin_lock(&fc->bg_lock);  in fuse_uring_queue_bq_req()
1310 	fc->num_background++;  in fuse_uring_queue_bq_req()
1311 	if (fc->num_background == fc->max_background)  in fuse_uring_queue_bq_req()
1312 		fc->blocked = 1;  in fuse_uring_queue_bq_req()
1314 	spin_unlock(&fc->bg_lock);  in fuse_uring_queue_bq_req()
1321 	req = list_first_entry_or_null(&queue->fuse_req_queue, struct fuse_req,  in fuse_uring_queue_bq_req()
1325 		spin_unlock(&queue->lock);  in fuse_uring_queue_bq_req()
1329 		spin_unlock(&queue->lock);  in fuse_uring_queue_bq_req()
1337 	struct fuse_ring_queue *queue = req->ring_queue;  in fuse_uring_remove_pending_req()
1339 	return fuse_remove_pending_req(req, &queue->lock);  in fuse_uring_remove_pending_req()
1343 	/* should be send over io-uring as enhancement */
1347 	 * could be send over io-uring, but interrupts should be rare,