[PATCH 2/2] io_uring: unify STOP_MULTISHOT with IOU_OK

[Pavel Begunkov <asml.silence@gmail.com>]

IOU_OK means that the request ownership is now handed back to core
io_uring and it has to complete it using the result provided in
req->cqe. Same is true for multishot and IOU_STOP_MULTISHOT.

Rename it into IOU_COMPLETE to avoid confusion and use for both modes.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/io_uring.c |  1 -
 io_uring/io_uring.h | 11 +++--------
 io_uring/net.c      | 19 ++++---------------
 io_uring/poll.c     |  2 +-
 io_uring/rw.c       |  4 +---
 5 files changed, 9 insertions(+), 28 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 6499d8e4d3d0..5ff30a7092ed 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1792,7 +1792,6 @@ int io_poll_issue(struct io_kiocb *req, io_tw_token_t tw)
 	ret = __io_issue_sqe(req, issue_flags, &io_issue_defs[req->opcode]);
 
 	WARN_ON_ONCE(ret == IOU_ISSUE_SKIP_COMPLETE);
-	WARN_ON_ONCE(ret == IOU_OK);
 	return ret;
 }
 
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index 3409740f6417..2308f39ed915 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -19,7 +19,9 @@
 #endif
 
 enum {
-	IOU_OK			= 0,
+	IOU_OK			= 0, /* deprecated, use IOU_COMPLETE */
+	IOU_COMPLETE		= 0,
+
 	IOU_ISSUE_SKIP_COMPLETE	= -EIOCBQUEUED,
 
 	/*
@@ -36,13 +38,6 @@ enum {
 	 * valid error code, yet less than -MAX_ERRNO and valid internally.
 	 */
 	IOU_REQUEUE		= -3072,
-
-	/*
-	 * Intended only when both IO_URING_F_MULTISHOT is passed
-	 * to indicate to the poll runner that multishot should be
-	 * removed and the result is set on req->cqe.res.
-	 */
-	IOU_STOP_MULTISHOT	= -ECANCELED,
 };
 
 struct io_wait_queue {
diff --git a/io_uring/net.c b/io_uring/net.c
index d9befb6fb8a7..9fa5c9570875 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -915,11 +915,7 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
 	/* Finish the request / stop multishot. */
 finish:
 	io_req_set_res(req, *ret, cflags);
-
-	if (issue_flags & IO_URING_F_MULTISHOT)
-		*ret = IOU_STOP_MULTISHOT;
-	else
-		*ret = IOU_OK;
+	*ret = IOU_COMPLETE;
 	io_req_msg_cleanup(req, issue_flags);
 	return true;
 }
@@ -1288,9 +1284,7 @@ int io_recvzc(struct io_kiocb *req, unsigned int issue_flags)
 	if (len && zc->len == 0) {
 		io_req_set_res(req, 0, 0);
 
-		if (issue_flags & IO_URING_F_MULTISHOT)
-			return IOU_STOP_MULTISHOT;
-		return IOU_OK;
+		return IOU_COMPLETE;
 	}
 	if (unlikely(ret <= 0) && ret != -EAGAIN) {
 		if (ret == -ERESTARTSYS)
@@ -1300,10 +1294,7 @@ int io_recvzc(struct io_kiocb *req, unsigned int issue_flags)
 
 		req_set_fail(req);
 		io_req_set_res(req, ret, 0);
-
-		if (issue_flags & IO_URING_F_MULTISHOT)
-			return IOU_STOP_MULTISHOT;
-		return IOU_OK;
+		return IOU_COMPLETE;
 	}
 	return IOU_RETRY;
 }
@@ -1709,9 +1700,7 @@ int io_accept(struct io_kiocb *req, unsigned int issue_flags)
 	io_req_set_res(req, ret, cflags);
 	if (ret < 0)
 		req_set_fail(req);
-	if (!(issue_flags & IO_URING_F_MULTISHOT))
-		return IOU_OK;
-	return IOU_STOP_MULTISHOT;
+	return IOU_COMPLETE;
 }
 
 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
diff --git a/io_uring/poll.c b/io_uring/poll.c
index 52e3c3e923f4..8eb744eb9f4c 100644
--- a/io_uring/poll.c
+++ b/io_uring/poll.c
@@ -290,7 +290,7 @@ static int io_poll_check_events(struct io_kiocb *req, io_tw_token_t tw)
 		} else {
 			int ret = io_poll_issue(req, tw);
 
-			if (ret == IOU_STOP_MULTISHOT)
+			if (ret == IOU_COMPLETE)
 				return IOU_POLL_REMOVE_POLL_USE_RES;
 			else if (ret == IOU_REQUEUE)
 				return IOU_POLL_REQUEUE;
diff --git a/io_uring/rw.c b/io_uring/rw.c
index 9a9c636defad..50037313555f 100644
--- a/io_uring/rw.c
+++ b/io_uring/rw.c
@@ -1104,9 +1104,7 @@ int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)
 	 */
 	io_req_set_res(req, ret, cflags);
 	io_req_rw_cleanup(req, issue_flags);
-	if (issue_flags & IO_URING_F_MULTISHOT)
-		return IOU_STOP_MULTISHOT;
-	return IOU_OK;
+	return IOU_COMPLETE;
 }
 
 static bool io_kiocb_start_write(struct io_kiocb *req, struct kiocb *kiocb)
-- 
2.48.1