diff mbox series

[4/9] io_uring: deduplicate failing task_work_add

Message ID 5ad81cd57c41877a4667ea8dd5397987af6cce41.1615375332.git.asml.silence@gmail.com
State New
Headers show
Series stable-5.11 backports | expand

Commit Message

Pavel Begunkov March 10, 2021, 11:30 a.m. UTC 
commit eab30c4d20dc761d463445e5130421863ff81505 upstream

When io_req_task_work_add() fails, the request will be cancelled by
enqueueing via task_works of io-wq. Extract a function for that.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 46 +++++++++++++++++-----------------------------
 1 file changed, 17 insertions(+), 29 deletions(-)
diff mbox series

Patch

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 842a7c017296..bc76929e0031 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2172,6 +2172,16 @@  static int io_req_task_work_add(struct io_kiocb *req)
 	return ret;
 }
 
+static void io_req_task_work_add_fallback(struct io_kiocb *req,
+					  void (*cb)(struct callback_head *))
+{
+	struct task_struct *tsk = io_wq_get_task(req->ctx->io_wq);
+
+	init_task_work(&req->task_work, cb);
+	task_work_add(tsk, &req->task_work, TWA_NONE);
+	wake_up_process(tsk);
+}
+
 static void __io_req_task_cancel(struct io_kiocb *req, int error)
 {
 	struct io_ring_ctx *ctx = req->ctx;
@@ -2229,14 +2239,8 @@  static void io_req_task_queue(struct io_kiocb *req)
 	percpu_ref_get(&req->ctx->refs);
 
 	ret = io_req_task_work_add(req);
-	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
-		init_task_work(&req->task_work, io_req_task_cancel);
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
-	}
+	if (unlikely(ret))
+		io_req_task_work_add_fallback(req, io_req_task_cancel);
 }
 
 static inline void io_queue_next(struct io_kiocb *req)
@@ -2354,13 +2358,8 @@  static void io_free_req_deferred(struct io_kiocb *req)
 
 	init_task_work(&req->task_work, io_put_req_deferred_cb);
 	ret = io_req_task_work_add(req);
-	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
-	}
+	if (unlikely(ret))
+		io_req_task_work_add_fallback(req, io_put_req_deferred_cb);
 }
 
 static inline void io_put_req_deferred(struct io_kiocb *req, int refs)
@@ -3439,15 +3438,8 @@  static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode,
 	/* submit ref gets dropped, acquire a new one */
 	refcount_inc(&req->refs);
 	ret = io_req_task_work_add(req);
-	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
-		/* queue just for cancelation */
-		init_task_work(&req->task_work, io_req_task_cancel);
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
-	}
+	if (unlikely(ret))
+		io_req_task_work_add_fallback(req, io_req_task_cancel);
 	return 1;
 }
 
@@ -5159,12 +5151,8 @@  static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
 	 */
 	ret = io_req_task_work_add(req);
 	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
 		WRITE_ONCE(poll->canceled, true);
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
+		io_req_task_work_add_fallback(req, func);
 	}
 	return 1;
 }