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_destruct()
151 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_destruct()
152 		struct fuse_ring_queue *queue = ring->queues[qid];  in fuse_uring_destruct()
158 		WARN_ON(!list_empty(&queue->ent_avail_queue));  in fuse_uring_destruct()
159 		WARN_ON(!list_empty(&queue->ent_w_req_queue));  in fuse_uring_destruct()
160 		WARN_ON(!list_empty(&queue->ent_commit_queue));  in fuse_uring_destruct()
161 		WARN_ON(!list_empty(&queue->ent_in_userspace));  in fuse_uring_destruct()
163 		list_for_each_entry_safe(ent, next, &queue->ent_released,  in fuse_uring_destruct()
165 			list_del_init(&ent->list);  in fuse_uring_destruct()
169 		kfree(queue->fpq.processing);  in fuse_uring_destruct()
171 		ring->queues[qid] = NULL;  in fuse_uring_destruct()
174 	kfree(ring->queues);  in fuse_uring_destruct()
176 	fc->ring = NULL;  in fuse_uring_destruct()
189 	ring = kzalloc(sizeof(*fc->ring), GFP_KERNEL_ACCOUNT);  in fuse_uring_create()
193 	ring->queues = kcalloc(nr_queues, sizeof(struct fuse_ring_queue *),  in fuse_uring_create()
195 	if (!ring->queues)  in fuse_uring_create()
198 	max_payload_size = max(FUSE_MIN_READ_BUFFER, fc->max_write);  in fuse_uring_create()
199 	max_payload_size = max(max_payload_size, fc->max_pages * PAGE_SIZE);  in fuse_uring_create()
201 	spin_lock(&fc->lock);  in fuse_uring_create()
202 	if (fc->ring) {  in fuse_uring_create()
204 		spin_unlock(&fc->lock);  in fuse_uring_create()
205 		res = fc->ring;  in fuse_uring_create()
209 	init_waitqueue_head(&ring->stop_waitq);  in fuse_uring_create()
211 	ring->nr_queues = nr_queues;  in fuse_uring_create()
212 	ring->fc = fc;  in fuse_uring_create()
213 	ring->max_payload_sz = max_payload_size;  in fuse_uring_create()
214 	atomic_set(&ring->queue_refs, 0);  in fuse_uring_create()
215 	smp_store_release(&fc->ring, ring);  in fuse_uring_create()
217 	spin_unlock(&fc->lock);  in fuse_uring_create()
221 	kfree(ring->queues);  in fuse_uring_create()
229 	struct fuse_conn *fc = ring->fc;  in fuse_uring_create_queue()
242 	queue->qid = qid;  in fuse_uring_create_queue()
243 	queue->ring = ring;  in fuse_uring_create_queue()
244 	spin_lock_init(&queue->lock);  in fuse_uring_create_queue()
246 	INIT_LIST_HEAD(&queue->ent_avail_queue);  in fuse_uring_create_queue()
247 	INIT_LIST_HEAD(&queue->ent_commit_queue);  in fuse_uring_create_queue()
248 	INIT_LIST_HEAD(&queue->ent_w_req_queue);  in fuse_uring_create_queue()
249 	INIT_LIST_HEAD(&queue->ent_in_userspace);  in fuse_uring_create_queue()
250 	INIT_LIST_HEAD(&queue->fuse_req_queue);  in fuse_uring_create_queue()
251 	INIT_LIST_HEAD(&queue->fuse_req_bg_queue);  in fuse_uring_create_queue()
252 	INIT_LIST_HEAD(&queue->ent_released);  in fuse_uring_create_queue()
254 	queue->fpq.processing = pq;  in fuse_uring_create_queue()
255 	fuse_pqueue_init(&queue->fpq);  in fuse_uring_create_queue()
257 	spin_lock(&fc->lock);  in fuse_uring_create_queue()
258 	if (ring->queues[qid]) {  in fuse_uring_create_queue()
259 		spin_unlock(&fc->lock);  in fuse_uring_create_queue()
260 		kfree(queue->fpq.processing);  in fuse_uring_create_queue()
262 		return ring->queues[qid];  in fuse_uring_create_queue()
268 	WRITE_ONCE(ring->queues[qid], queue);  in fuse_uring_create_queue()
269 	spin_unlock(&fc->lock);  in fuse_uring_create_queue()
276 	clear_bit(FR_SENT, &req->flags);  in fuse_uring_stop_fuse_req_end()
277 	req->out.h.error = -ECONNABORTED;  in fuse_uring_stop_fuse_req_end()
289 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_entry_teardown()
291 	spin_lock(&queue->lock);  in fuse_uring_entry_teardown()
292 	cmd = ent->cmd;  in fuse_uring_entry_teardown()
293 	ent->cmd = NULL;  in fuse_uring_entry_teardown()
294 	req = ent->fuse_req;  in fuse_uring_entry_teardown()
295 	ent->fuse_req = NULL;  in fuse_uring_entry_teardown()
297 		/* remove entry from queue->fpq->processing */  in fuse_uring_entry_teardown()
298 		list_del_init(&req->list);  in fuse_uring_entry_teardown()
303 	 * pointer access of entries through IO_URING_F_CANCEL - there is a risk  in fuse_uring_entry_teardown()
307 	list_move(&ent->list, &queue->ent_released);  in fuse_uring_entry_teardown()
308 	ent->state = FRRS_RELEASED;  in fuse_uring_entry_teardown()
309 	spin_unlock(&queue->lock);  in fuse_uring_entry_teardown()
312 		io_uring_cmd_done(cmd, -ENOTCONN, 0, IO_URING_F_UNLOCKED);  in fuse_uring_entry_teardown()
322 	struct fuse_ring *ring = queue->ring;  in fuse_uring_stop_list_entries()
327 	spin_lock(&queue->lock);  in fuse_uring_stop_list_entries()
329 		if (ent->state != exp_state) {  in fuse_uring_stop_list_entries()
331 				queue->qid, ent->state, exp_state);  in fuse_uring_stop_list_entries()
335 		ent->state = FRRS_TEARDOWN;  in fuse_uring_stop_list_entries()
336 		list_move(&ent->list, &to_teardown);  in fuse_uring_stop_list_entries()
338 	spin_unlock(&queue->lock);  in fuse_uring_stop_list_entries()
343 		queue_refs = atomic_dec_return(&ring->queue_refs);  in fuse_uring_stop_list_entries()
350 	fuse_uring_stop_list_entries(&queue->ent_in_userspace, queue,  in fuse_uring_teardown_entries()
352 	fuse_uring_stop_list_entries(&queue->ent_avail_queue, queue,  in fuse_uring_teardown_entries()
364 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_log_ent_state()
365 		struct fuse_ring_queue *queue = ring->queues[qid];  in fuse_uring_log_ent_state()
370 		spin_lock(&queue->lock);  in fuse_uring_log_ent_state()
375 		list_for_each_entry(ent, &queue->ent_w_req_queue, list) {  in fuse_uring_log_ent_state()
376 			pr_info(" ent-req-queue ring=%p qid=%d ent=%p state=%d\n",  in fuse_uring_log_ent_state()
377 				ring, qid, ent, ent->state);  in fuse_uring_log_ent_state()
379 		list_for_each_entry(ent, &queue->ent_commit_queue, list) {  in fuse_uring_log_ent_state()
380 			pr_info(" ent-commit-queue ring=%p qid=%d ent=%p state=%d\n",  in fuse_uring_log_ent_state()
381 				ring, qid, ent, ent->state);  in fuse_uring_log_ent_state()
383 		spin_unlock(&queue->lock);  in fuse_uring_log_ent_state()
385 	ring->stop_debug_log = 1;  in fuse_uring_log_ent_state()
395 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_async_stop_queues()
396 		struct fuse_ring_queue *queue = READ_ONCE(ring->queues[qid]);  in fuse_uring_async_stop_queues()
407 	 * or on the way to userspace - we could handle that with conditions in  in fuse_uring_async_stop_queues()
411 	if (atomic_read(&ring->queue_refs) > 0) {  in fuse_uring_async_stop_queues()
413 			       ring->teardown_time + FUSE_URING_TEARDOWN_TIMEOUT))  in fuse_uring_async_stop_queues()
416 		schedule_delayed_work(&ring->async_teardown_work,  in fuse_uring_async_stop_queues()
419 		wake_up_all(&ring->stop_waitq);  in fuse_uring_async_stop_queues()
430 	for (qid = 0; qid < ring->nr_queues; qid++) {  in fuse_uring_stop_queues()
431 		struct fuse_ring_queue *queue = READ_ONCE(ring->queues[qid]);  in fuse_uring_stop_queues()
439 	if (atomic_read(&ring->queue_refs) > 0) {  in fuse_uring_stop_queues()
440 		ring->teardown_time = jiffies;  in fuse_uring_stop_queues()
441 		INIT_DELAYED_WORK(&ring->async_teardown_work,  in fuse_uring_stop_queues()
443 		schedule_delayed_work(&ring->async_teardown_work,  in fuse_uring_stop_queues()
446 		wake_up_all(&ring->stop_waitq);  in fuse_uring_stop_queues()
464 	 * direct access on ent - it must not be destructed as long as  in fuse_uring_cancel()
467 	queue = ent->queue;  in fuse_uring_cancel()
468 	spin_lock(&queue->lock);  in fuse_uring_cancel()
469 	if (ent->state == FRRS_AVAILABLE) {  in fuse_uring_cancel()
470 		ent->state = FRRS_USERSPACE;  in fuse_uring_cancel()
471 		list_move(&ent->list, &queue->ent_in_userspace);  in fuse_uring_cancel()
473 		ent->cmd = NULL;  in fuse_uring_cancel()
475 	spin_unlock(&queue->lock);  in fuse_uring_cancel()
479 		io_uring_cmd_done(cmd, -ENOTCONN, 0, issue_flags);  in fuse_uring_cancel()
499 	err = -EINVAL;  in fuse_uring_out_header_has_err()
500 	if (oh->unique == 0) {  in fuse_uring_out_header_has_err()
501 		/* Not supported through io-uring yet */  in fuse_uring_out_header_has_err()
502 		pr_warn_once("notify through fuse-io-uring not supported\n");  in fuse_uring_out_header_has_err()
506 	if (oh->error <= -ERESTARTSYS || oh->error > 0)  in fuse_uring_out_header_has_err()
509 	if (oh->error) {  in fuse_uring_out_header_has_err()
510 		err = oh->error;  in fuse_uring_out_header_has_err()
514 	err = -ENOENT;  in fuse_uring_out_header_has_err()
515 	if ((oh->unique & ~FUSE_INT_REQ_BIT) != req->in.h.unique) {  in fuse_uring_out_header_has_err()
517 				    req->in.h.unique,  in fuse_uring_out_header_has_err()
518 				    oh->unique & ~FUSE_INT_REQ_BIT);  in fuse_uring_out_header_has_err()
524 	 * XXX: Not supported through fuse-io-uring yet, it should not even  in fuse_uring_out_header_has_err()
525 	 *      find the request - should not happen.  in fuse_uring_out_header_has_err()
527 	WARN_ON_ONCE(oh->unique & FUSE_INT_REQ_BIT);  in fuse_uring_out_header_has_err()
539 	struct fuse_args *args = req->args;  in fuse_uring_copy_from_ring()
544 	err = copy_from_user(&ring_in_out, &ent->headers->ring_ent_in_out,  in fuse_uring_copy_from_ring()
547 		return -EFAULT;  in fuse_uring_copy_from_ring()
549 	err = import_ubuf(ITER_SOURCE, ent->payload, ring->max_payload_sz,  in fuse_uring_copy_from_ring()
568 	struct fuse_args *args = req->args;  in fuse_uring_args_to_ring()
569 	struct fuse_in_arg *in_args = args->in_args;  in fuse_uring_args_to_ring()
570 	int num_args = args->in_numargs;  in fuse_uring_args_to_ring()
575 		.commit_id = req->in.h.unique,  in fuse_uring_args_to_ring()
578 	err = import_ubuf(ITER_DEST, ent->payload, ring->max_payload_sz, &iter);  in fuse_uring_args_to_ring()
593 		if (args->in_args[0].size > 0) {  in fuse_uring_args_to_ring()
594 			err = copy_to_user(&ent->headers->op_in, in_args->value,  in fuse_uring_args_to_ring()
595 					   in_args->size);  in fuse_uring_args_to_ring()
599 				return -EFAULT;  in fuse_uring_args_to_ring()
603 		num_args--;  in fuse_uring_args_to_ring()
607 	err = fuse_copy_args(&cs, num_args, args->in_pages,  in fuse_uring_args_to_ring()
615 	err = copy_to_user(&ent->headers->ring_ent_in_out, &ent_in_out,  in fuse_uring_args_to_ring()
617 	return err ? -EFAULT : 0;  in fuse_uring_args_to_ring()
623 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_copy_to_ring()
624 	struct fuse_ring *ring = queue->ring;  in fuse_uring_copy_to_ring()
627 	err = -EIO;  in fuse_uring_copy_to_ring()
628 	if (WARN_ON(ent->state != FRRS_FUSE_REQ)) {  in fuse_uring_copy_to_ring()
629 		pr_err("qid=%d ring-req=%p invalid state %d on send\n",  in fuse_uring_copy_to_ring()
630 		       queue->qid, ent, ent->state);  in fuse_uring_copy_to_ring()
634 	err = -EINVAL;  in fuse_uring_copy_to_ring()
635 	if (WARN_ON(req->in.h.unique == 0))  in fuse_uring_copy_to_ring()
646 	err = copy_to_user(&ent->headers->in_out, &req->in.h,  in fuse_uring_copy_to_ring()
647 			   sizeof(req->in.h));  in fuse_uring_copy_to_ring()
649 		err = -EFAULT;  in fuse_uring_copy_to_ring()
663 		set_bit(FR_SENT, &req->flags);  in fuse_uring_prepare_send()
679 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_send_next_to_ring()
687 	spin_lock(&queue->lock);  in fuse_uring_send_next_to_ring()
688 	cmd = ent->cmd;  in fuse_uring_send_next_to_ring()
689 	ent->cmd = NULL;  in fuse_uring_send_next_to_ring()
690 	ent->state = FRRS_USERSPACE;  in fuse_uring_send_next_to_ring()
691 	list_move(&ent->list, &queue->ent_in_userspace);  in fuse_uring_send_next_to_ring()
692 	spin_unlock(&queue->lock);  in fuse_uring_send_next_to_ring()
704 	WARN_ON_ONCE(!ent->cmd);  in fuse_uring_ent_avail()
705 	list_move(&ent->list, &queue->ent_avail_queue);  in fuse_uring_ent_avail()
706 	ent->state = FRRS_AVAILABLE;  in fuse_uring_ent_avail()
713 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_add_to_pq()
714 	struct fuse_pqueue *fpq = &queue->fpq;  in fuse_uring_add_to_pq()
717 	req->ring_entry = ent;  in fuse_uring_add_to_pq()
718 	hash = fuse_req_hash(req->in.h.unique);  in fuse_uring_add_to_pq()
719 	list_move_tail(&req->list, &fpq->processing[hash]);  in fuse_uring_add_to_pq()
728 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_add_req_to_ring_ent()
730 	lockdep_assert_held(&queue->lock);  in fuse_uring_add_req_to_ring_ent()
732 	if (WARN_ON_ONCE(ent->state != FRRS_AVAILABLE &&  in fuse_uring_add_req_to_ring_ent()
733 			 ent->state != FRRS_COMMIT)) {  in fuse_uring_add_req_to_ring_ent()
734 		pr_warn("%s qid=%d state=%d\n", __func__, ent->queue->qid,  in fuse_uring_add_req_to_ring_ent()
735 			ent->state);  in fuse_uring_add_req_to_ring_ent()
738 	clear_bit(FR_PENDING, &req->flags);  in fuse_uring_add_req_to_ring_ent()
739 	ent->fuse_req = req;  in fuse_uring_add_req_to_ring_ent()
740 	ent->state = FRRS_FUSE_REQ;  in fuse_uring_add_req_to_ring_ent()
741 	list_move(&ent->list, &queue->ent_w_req_queue);  in fuse_uring_add_req_to_ring_ent()
747 	__must_hold(&queue->lock)  in fuse_uring_ent_assign_req()
750 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_ent_assign_req()
751 	struct list_head *req_queue = &queue->fuse_req_queue;  in fuse_uring_ent_assign_req()
753 	lockdep_assert_held(&queue->lock);  in fuse_uring_ent_assign_req()
771 	struct fuse_ring *ring = ent->queue->ring;  in fuse_uring_commit()
772 	struct fuse_conn *fc = ring->fc;  in fuse_uring_commit()
775 	err = copy_from_user(&req->out.h, &ent->headers->in_out,  in fuse_uring_commit()
776 			     sizeof(req->out.h));  in fuse_uring_commit()
778 		req->out.h.error = -EFAULT;  in fuse_uring_commit()
782 	err = fuse_uring_out_header_has_err(&req->out.h, req, fc);  in fuse_uring_commit()
784 		/* req->out.h.error already set */  in fuse_uring_commit()
804 	spin_lock(&queue->lock);  in fuse_uring_next_fuse_req()
807 	spin_unlock(&queue->lock);  in fuse_uring_next_fuse_req()
818 	struct fuse_ring_queue *queue = ent->queue;  in fuse_ring_ent_set_commit()
820 	lockdep_assert_held(&queue->lock);  in fuse_ring_ent_set_commit()
822 	if (WARN_ON_ONCE(ent->state != FRRS_USERSPACE))  in fuse_ring_ent_set_commit()
823 		return -EIO;  in fuse_ring_ent_set_commit()
825 	ent->state = FRRS_COMMIT;  in fuse_ring_ent_set_commit()
826 	list_move(&ent->list, &queue->ent_commit_queue);  in fuse_ring_ent_set_commit()
835 	const struct fuse_uring_cmd_req *cmd_req = io_uring_sqe_cmd(cmd->sqe);  in fuse_uring_commit_fetch()
838 	struct fuse_ring *ring = fc->ring;  in fuse_uring_commit_fetch()
840 	uint64_t commit_id = READ_ONCE(cmd_req->commit_id);  in fuse_uring_commit_fetch()
841 	unsigned int qid = READ_ONCE(cmd_req->qid);  in fuse_uring_commit_fetch()
845 	err = -ENOTCONN;  in fuse_uring_commit_fetch()
849 	if (qid >= ring->nr_queues)  in fuse_uring_commit_fetch()
850 		return -EINVAL;  in fuse_uring_commit_fetch()
852 	queue = ring->queues[qid];  in fuse_uring_commit_fetch()
855 	fpq = &queue->fpq;  in fuse_uring_commit_fetch()
857 	if (!READ_ONCE(fc->connected) || READ_ONCE(queue->stopped))  in fuse_uring_commit_fetch()
860 	spin_lock(&queue->lock);  in fuse_uring_commit_fetch()
867 	err = -ENOENT;  in fuse_uring_commit_fetch()
869 		pr_info("qid=%d commit_id %llu not found\n", queue->qid,  in fuse_uring_commit_fetch()
871 		spin_unlock(&queue->lock);  in fuse_uring_commit_fetch()
874 	list_del_init(&req->list);  in fuse_uring_commit_fetch()
875 	ent = req->ring_entry;  in fuse_uring_commit_fetch()
876 	req->ring_entry = NULL;  in fuse_uring_commit_fetch()
881 				    queue->qid, commit_id, ent->state);  in fuse_uring_commit_fetch()
882 		spin_unlock(&queue->lock);  in fuse_uring_commit_fetch()
883 		req->out.h.error = err;  in fuse_uring_commit_fetch()
884 		clear_bit(FR_SENT, &req->flags);  in fuse_uring_commit_fetch()
889 	ent->cmd = cmd;  in fuse_uring_commit_fetch()
890 	spin_unlock(&queue->lock);  in fuse_uring_commit_fetch()
898 	 * fuse requests would otherwise not get processed - committing  in fuse_uring_commit_fetch()
912 	for (qid = 0; qid < ring->nr_queues && ready; qid++) {  in is_ring_ready()
916 		queue = ring->queues[qid];  in is_ring_ready()
922 		spin_lock(&queue->lock);  in is_ring_ready()
923 		if (list_empty(&queue->ent_avail_queue))  in is_ring_ready()
925 		spin_unlock(&queue->lock);  in is_ring_ready()
938 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_do_register()
939 	struct fuse_ring *ring = queue->ring;  in fuse_uring_do_register()
940 	struct fuse_conn *fc = ring->fc;  in fuse_uring_do_register()
941 	struct fuse_iqueue *fiq = &fc->iq;  in fuse_uring_do_register()  local
945 	spin_lock(&queue->lock);  in fuse_uring_do_register()
946 	ent->cmd = cmd;  in fuse_uring_do_register()
948 	spin_unlock(&queue->lock);  in fuse_uring_do_register()
950 	if (!ring->ready) {  in fuse_uring_do_register()
951 		bool ready = is_ring_ready(ring, queue->qid);  in fuse_uring_do_register()
954 			WRITE_ONCE(fiq->ops, &fuse_io_uring_ops);  in fuse_uring_do_register()
955 			WRITE_ONCE(ring->ready, true);  in fuse_uring_do_register()
956 			wake_up_all(&fc->blocked_waitq);  in fuse_uring_do_register()
962  * sqe->addr is a ptr to an iovec array, iov[0] has the headers, iov[1]
968 	struct iovec __user *uiov = u64_to_user_ptr(READ_ONCE(sqe->addr));  in fuse_uring_get_iovec_from_sqe()
972 	if (sqe->len != FUSE_URING_IOV_SEGS)  in fuse_uring_get_iovec_from_sqe()
973 		return -EINVAL;  in fuse_uring_get_iovec_from_sqe()
991 	struct fuse_ring *ring = queue->ring;  in fuse_uring_create_ring_ent()
997 	err = fuse_uring_get_iovec_from_sqe(cmd->sqe, iov);  in fuse_uring_create_ring_ent()
1004 	err = -EINVAL;  in fuse_uring_create_ring_ent()
1011 	if (payload_size < ring->max_payload_sz) {  in fuse_uring_create_ring_ent()
1017 	err = -ENOMEM;  in fuse_uring_create_ring_ent()
1022 	INIT_LIST_HEAD(&ent->list);  in fuse_uring_create_ring_ent()
1024 	ent->queue = queue;  in fuse_uring_create_ring_ent()
1025 	ent->headers = iov[0].iov_base;  in fuse_uring_create_ring_ent()
1026 	ent->payload = iov[1].iov_base;  in fuse_uring_create_ring_ent()
1028 	atomic_inc(&ring->queue_refs);  in fuse_uring_create_ring_ent()
1039 	const struct fuse_uring_cmd_req *cmd_req = io_uring_sqe_cmd(cmd->sqe);  in fuse_uring_register()
1040 	struct fuse_ring *ring = smp_load_acquire(&fc->ring);  in fuse_uring_register()
1044 	unsigned int qid = READ_ONCE(cmd_req->qid);  in fuse_uring_register()
1046 	err = -ENOMEM;  in fuse_uring_register()
1053 	if (qid >= ring->nr_queues) {  in fuse_uring_register()
1055 		return -EINVAL;  in fuse_uring_register()
1058 	queue = ring->queues[qid];  in fuse_uring_register()
1087 	u32 cmd_op = cmd->cmd_op;  in fuse_uring_cmd()
1097 		return -EINVAL;  in fuse_uring_cmd()
1099 	fud = fuse_get_dev(cmd->file);  in fuse_uring_cmd()
1101 		pr_info_ratelimited("No fuse device found\n");  in fuse_uring_cmd()
1102 		return -ENOTCONN;  in fuse_uring_cmd()
1104 	fc = fud->fc;  in fuse_uring_cmd()
1106 	/* Once a connection has io-uring enabled on it, it can't be disabled */  in fuse_uring_cmd()
1107 	if (!enable_uring && !fc->io_uring) {  in fuse_uring_cmd()
1108 		pr_info_ratelimited("fuse-io-uring is disabled\n");  in fuse_uring_cmd()
1109 		return -EOPNOTSUPP;  in fuse_uring_cmd()
1112 	if (fc->aborted)  in fuse_uring_cmd()
1113 		return -ECONNABORTED;  in fuse_uring_cmd()
1114 	if (!fc->connected)  in fuse_uring_cmd()
1115 		return -ENOTCONN;  in fuse_uring_cmd()
1121 	if (!fc->initialized)  in fuse_uring_cmd()
1122 		return -EAGAIN;  in fuse_uring_cmd()
1130 			fc->io_uring = 0;  in fuse_uring_cmd()
1131 			wake_up_all(&fc->blocked_waitq);  in fuse_uring_cmd()
1144 		return -EINVAL;  in fuse_uring_cmd()
1147 	return -EIOCBQUEUED;  in fuse_uring_cmd()
1153 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_send()
1155 	spin_lock(&queue->lock);  in fuse_uring_send()
1156 	ent->state = FRRS_USERSPACE;  in fuse_uring_send()
1157 	list_move(&ent->list, &queue->ent_in_userspace);  in fuse_uring_send()
1158 	ent->cmd = NULL;  in fuse_uring_send()
1159 	spin_unlock(&queue->lock);  in fuse_uring_send()
1165  * This prepares and sends the ring request in fuse-uring task context.
1166  * User buffers are not mapped yet - the application does not have permission
1167  * to write to it - this has to be executed in ring task context.
1173 	struct fuse_ring_queue *queue = ent->queue;  in fuse_uring_send_in_task()
1177 		err = fuse_uring_prepare_send(ent, ent->fuse_req);  in fuse_uring_send_in_task()
1183 		err = -ECANCELED;  in fuse_uring_send_in_task()
1196 	if (WARN_ONCE(qid >= ring->nr_queues,  in fuse_uring_task_to_queue()
1198 		      ring->nr_queues))  in fuse_uring_task_to_queue()
1201 	queue = ring->queues[qid];  in fuse_uring_task_to_queue()
1209 	struct io_uring_cmd *cmd = ent->cmd;  in fuse_uring_dispatch_ent()
1216 void fuse_uring_queue_fuse_req(struct fuse_iqueue *fiq, struct fuse_req *req)  in fuse_uring_queue_fuse_req()  argument
1218 	struct fuse_conn *fc = req->fm->fc;  in fuse_uring_queue_fuse_req()
1219 	struct fuse_ring *ring = fc->ring;  in fuse_uring_queue_fuse_req()
1224 	err = -EINVAL;  in fuse_uring_queue_fuse_req()
1229 	if (req->in.h.opcode != FUSE_NOTIFY_REPLY)  in fuse_uring_queue_fuse_req()
1230 		req->in.h.unique = fuse_get_unique(fiq);  in fuse_uring_queue_fuse_req()
1232 	spin_lock(&queue->lock);  in fuse_uring_queue_fuse_req()
1233 	err = -ENOTCONN;  in fuse_uring_queue_fuse_req()
1234 	if (unlikely(queue->stopped))  in fuse_uring_queue_fuse_req()
1237 	set_bit(FR_URING, &req->flags);  in fuse_uring_queue_fuse_req()
1238 	req->ring_queue = queue;  in fuse_uring_queue_fuse_req()
1239 	ent = list_first_entry_or_null(&queue->ent_avail_queue,  in fuse_uring_queue_fuse_req()
1244 		list_add_tail(&req->list, &queue->fuse_req_queue);  in fuse_uring_queue_fuse_req()
1245 	spin_unlock(&queue->lock);  in fuse_uring_queue_fuse_req()
1253 	spin_unlock(&queue->lock);  in fuse_uring_queue_fuse_req()
1255 	req->out.h.error = err;  in fuse_uring_queue_fuse_req()
1256 	clear_bit(FR_PENDING, &req->flags);  in fuse_uring_queue_fuse_req()
1262 	struct fuse_conn *fc = req->fm->fc;  in fuse_uring_queue_bq_req()
1263 	struct fuse_ring *ring = fc->ring;  in fuse_uring_queue_bq_req()
1271 	spin_lock(&queue->lock);  in fuse_uring_queue_bq_req()
1272 	if (unlikely(queue->stopped)) {  in fuse_uring_queue_bq_req()
1273 		spin_unlock(&queue->lock);  in fuse_uring_queue_bq_req()
1277 	set_bit(FR_URING, &req->flags);  in fuse_uring_queue_bq_req()
1278 	req->ring_queue = queue;  in fuse_uring_queue_bq_req()
1279 	list_add_tail(&req->list, &queue->fuse_req_bg_queue);  in fuse_uring_queue_bq_req()
1281 	ent = list_first_entry_or_null(&queue->ent_avail_queue,  in fuse_uring_queue_bq_req()
1283 	spin_lock(&fc->bg_lock);  in fuse_uring_queue_bq_req()
1284 	fc->num_background++;  in fuse_uring_queue_bq_req()
1285 	if (fc->num_background == fc->max_background)  in fuse_uring_queue_bq_req()
1286 		fc->blocked = 1;  in fuse_uring_queue_bq_req()
1288 	spin_unlock(&fc->bg_lock);  in fuse_uring_queue_bq_req()
1295 	req = list_first_entry_or_null(&queue->fuse_req_queue, struct fuse_req,  in fuse_uring_queue_bq_req()
1299 		spin_unlock(&queue->lock);  in fuse_uring_queue_bq_req()
1303 		spin_unlock(&queue->lock);  in fuse_uring_queue_bq_req()
1311 	struct fuse_ring_queue *queue = req->ring_queue;  in fuse_uring_remove_pending_req()
1313 	return fuse_remove_pending_req(req, &queue->lock);  in fuse_uring_remove_pending_req()
1317 	/* should be send over io-uring as enhancement */
1321 	 * could be send over io-uring, but interrupts should be rare,