linux-kernel - [PATCH v2 4/5] io_uring: don't do full *prep

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Message-Id: <b1d0bfedb3d30f406a1adbd34a3ef52cc23764d2.1581785642.git.asml.silence@gmail.com>
Date:   Sun, 16 Feb 2020 01:01:21 +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 v2 4/5] io_uring: don't do full *prep_worker() from io-wq

io_prep_async_worker() called io_wq_assign_next() do many useless checks:
io_req_work_grab_env() was already called during prep, and @do_hashed
is not ever used. Add io_prep_next_work() -- simplified version, that
can be called io-wq.

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 0dd2f10d8ad8..4515db6a64d6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -952,6 +952,17 @@ 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)
 {
@@ -2459,7 +2470,7 @@ 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