linux-kernel - [PATCH 3/5] io_uring: fix reassigning work.task

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Date:   Tue, 11 Feb 2020 23:01:56 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] io_uring: fix reassigning work.task_pid from io-wq

If a request got into io-wq context, io_prep_async_work() has already
been called. Most of the stuff there is idempotent with an exception
that it'll set work.task_pid to task_pid_vnr() of an io_wq worker thread

Do only what's needed, that's io_prep_linked_timeout() and setting
IO_WQ_WORK_UNBOUND.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 04680d2c205c..f3108bce4afe 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -948,6 +948,17 @@ static inline void io_req_work_drop_env(struct io_kiocb *req)
 	}
 }
 
+static inline void io_prep_next_work(struct io_kiocb *req,
+				     struct io_kiocb **link)
+{
+	const struct io_op_def *def = &io_op_defs[req->opcode];
+
+	if (!(req->flags & REQ_F_ISREG) && def->unbound_nonreg_file)
+			req->work.flags |= IO_WQ_WORK_UNBOUND;
+
+	*link = io_prep_linked_timeout(req);
+}
+
 static inline bool io_prep_async_work(struct io_kiocb *req,
 				      struct io_kiocb **link)
 {
@@ -2453,7 +2464,7 @@ static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)
 {
 	struct io_kiocb *link;
 
-	io_prep_async_work(nxt, &link);
+	io_prep_next_work(nxt, &link);
 	*workptr = &nxt->work;
 	if (link) {
 		nxt->work.flags |= IO_WQ_WORK_CB;
-- 
2.24.0