io_uring: don't expose io_fill_cqe_aux()

Deduplicate some code and add a helper for filling an aux CQE, locking
and notification.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b7c6557c8f9dc5c4cfb01292116c682a0ff61081.1655455613.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -676,8 +676,8 @@ bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, s32 res,
 	return true;
 }
 
-bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res,
-		     u32 cflags)
+static bool io_fill_cqe_aux(struct io_ring_ctx *ctx,
+			    u64 user_data, s32 res, u32 cflags)
 {
 	struct io_uring_cqe *cqe;
 
@@ -704,6 +704,20 @@ bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res,
 	return io_cqring_event_overflow(ctx, user_data, res, cflags, 0, 0);
 }
 
+bool io_post_aux_cqe(struct io_ring_ctx *ctx,
+		     u64 user_data, s32 res, u32 cflags)
+{
+	bool filled;
+
+	spin_lock(&ctx->completion_lock);
+	filled = io_fill_cqe_aux(ctx, user_data, res, cflags);
+	io_commit_cqring(ctx);
+	spin_unlock(&ctx->completion_lock);
+	if (filled)
+		io_cqring_ev_posted(ctx);
+	return filled;
+}
+
 static void __io_req_complete_put(struct io_kiocb *req)
 {
 	/*

io_uring/io_uring.h

@@ -239,8 +239,7 @@ void io_req_complete_failed(struct io_kiocb *req, s32 res);
 void __io_req_complete(struct io_kiocb *req, unsigned issue_flags);
 void io_req_complete_post(struct io_kiocb *req);
 void __io_req_complete_post(struct io_kiocb *req);
-bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res,
-		     u32 cflags);
+bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
 void io_cqring_ev_posted(struct io_ring_ctx *ctx);
 void __io_commit_cqring_flush(struct io_ring_ctx *ctx);
 

io_uring/msg_ring.c

@@ -34,7 +34,6 @@ int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_msg *msg = io_kiocb_to_cmd(req);
 	struct io_ring_ctx *target_ctx;
-	bool filled;
 	int ret;
 
 	ret = -EBADFD;
@@ -43,16 +42,8 @@ int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags)
 
 	ret = -EOVERFLOW;
 	target_ctx = req->file->private_data;
-
-	spin_lock(&target_ctx->completion_lock);
-	filled = io_fill_cqe_aux(target_ctx, msg->user_data, msg->len, 0);
-	io_commit_cqring(target_ctx);
-	spin_unlock(&target_ctx->completion_lock);
-
-	if (filled) {
-		io_cqring_ev_posted(target_ctx);
+	if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
 		ret = 0;
-	}
 
 done:
 	if (ret < 0)

io_uring/net.c

@@ -644,22 +644,12 @@ retry:
 		io_req_set_res(req, ret, 0);
 		return IOU_OK;
 	}
-	if (ret >= 0) {
-		bool filled;
 
-		spin_lock(&ctx->completion_lock);
-		filled = io_fill_cqe_aux(ctx, req->cqe.user_data, ret,
-					 IORING_CQE_F_MORE);
-		io_commit_cqring(ctx);
-		spin_unlock(&ctx->completion_lock);
-		if (filled) {
-			io_cqring_ev_posted(ctx);
-			goto retry;
-		}
-		ret = -ECANCELED;
-	}
-
-	return ret;
+	if (ret < 0)
+		return ret;
+	if (io_post_aux_cqe(ctx, req->cqe.user_data, ret, IORING_CQE_F_MORE))
+		goto retry;
+	return -ECANCELED;
 }
 
 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)

io_uring/poll.c

@@ -214,24 +214,16 @@ static int io_poll_check_events(struct io_kiocb *req, bool *locked)
 		if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
 			__poll_t mask = mangle_poll(req->cqe.res &
 						    req->apoll_events);
-			bool filled;
 
-			spin_lock(&ctx->completion_lock);
-			filled = io_fill_cqe_aux(ctx, req->cqe.user_data,
-						 mask, IORING_CQE_F_MORE);
-			io_commit_cqring(ctx);
-			spin_unlock(&ctx->completion_lock);
-			if (filled) {
-				io_cqring_ev_posted(ctx);
-				continue;
-			}
-			return -ECANCELED;
+			if (!io_post_aux_cqe(ctx, req->cqe.user_data,
+					     mask, IORING_CQE_F_MORE))
+				return -ECANCELED;
+		} else {
+			ret = io_poll_issue(req, locked);
+			if (ret)
+				return ret;
 		}
 
-		ret = io_poll_issue(req, locked);
-		if (ret)
-			return ret;
-
 		/*
 		 * Release all references, retry if someone tried to restart
 		 * task_work while we were executing it.

io_uring/rsrc.c

@@ -174,17 +174,13 @@ static void __io_rsrc_put_work(struct io_rsrc_node *ref_node)
 		list_del(&prsrc->list);
 
 		if (prsrc->tag) {
-			if (ctx->flags & IORING_SETUP_IOPOLL)
+			if (ctx->flags & IORING_SETUP_IOPOLL) {
 				mutex_lock(&ctx->uring_lock);
-
-			spin_lock(&ctx->completion_lock);
-			io_fill_cqe_aux(ctx, prsrc->tag, 0, 0);
-			io_commit_cqring(ctx);
-			spin_unlock(&ctx->completion_lock);
-			io_cqring_ev_posted(ctx);
-
-			if (ctx->flags & IORING_SETUP_IOPOLL)
+				io_post_aux_cqe(ctx, prsrc->tag, 0, 0);
 				mutex_unlock(&ctx->uring_lock);
+			} else {
+				io_post_aux_cqe(ctx, prsrc->tag, 0, 0);
+			}
 		}
 
 		rsrc_data->do_put(ctx, prsrc);