linux-kernel - [PATCH 6/8] io_uring: move *link into io_submit

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Date:   Sat, 25 Jan 2020 00:40:29 +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 6/8] io_uring: move *link into io_submit_state

It's more convenient to have it in the submission state, than passing as
a pointer, so move it.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index c0e72390d272..f022453e3839 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -221,6 +221,7 @@ struct io_submit_state {
 	int			ring_fd;
 
 	struct mm_struct	*mm;
+	struct io_kiocb		*link;
 };
 
 struct io_ring_ctx {
@@ -4664,10 +4665,10 @@ static inline void io_queue_link_head(struct io_kiocb *req)
 #define SQE_VALID_FLAGS	(IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK|	\
 				IOSQE_IO_HARDLINK | IOSQE_ASYNC)
 
-static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
-			  struct io_kiocb **link)
+static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_ring_ctx *ctx = req->ctx;
+	struct io_submit_state *state = &ctx->submit_state;
 	unsigned int sqe_flags;
 	int ret;
 
@@ -4697,8 +4698,8 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 	 * submitted sync once the chain is complete. If none of those
 	 * conditions are true (normal request), then just queue it.
 	 */
-	if (*link) {
-		struct io_kiocb *head = *link;
+	if (state->link) {
+		struct io_kiocb *head = state->link;
 
 		/*
 		 * Taking sequential execution of a link, draining both sides
@@ -4728,7 +4729,7 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 		/* last request of a link, enqueue the link */
 		if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK))) {
 			io_queue_link_head(head);
-			*link = NULL;
+			state->link = NULL;
 		}
 	} else {
 		if (unlikely(ctx->drain_next)) {
@@ -4741,7 +4742,7 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 			ret = io_req_defer_prep(req, sqe);
 			if (ret)
 				req->flags |= REQ_F_FAIL_LINK;
-			*link = req;
+			state->link = req;
 		} else {
 			io_queue_sqe(req, sqe);
 		}
@@ -4761,6 +4762,8 @@ static void io_submit_end(struct io_ring_ctx *ctx)
 	if (state->free_reqs)
 		kmem_cache_free_bulk(req_cachep, state->free_reqs,
 					&state->reqs[state->cur_req]);
+	if (state->link)
+		io_queue_link_head(state->link);
 }
 
 /*
@@ -4777,6 +4780,7 @@ static void io_submit_start(struct io_ring_ctx *ctx, unsigned int max_ios,
 
 	state->ring_file = ring_file;
 	state->ring_fd = ring_fd;
+	state->link = NULL;
 }
 
 static void io_commit_sqring(struct io_ring_ctx *ctx)
@@ -4839,7 +4843,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
 			  struct file *ring_file, int ring_fd, bool async)
 {
 	struct blk_plug plug;
-	struct io_kiocb *link = NULL;
 	int i, submitted = 0;
 	bool mm_fault = false;
 
@@ -4897,14 +4900,12 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
 		req->needs_fixed_file = async;
 		trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data,
 						true, async);
-		if (!io_submit_sqe(req, sqe, &link))
+		if (!io_submit_sqe(req, sqe))
 			break;
 	}
 
 	if (submitted != nr)
 		percpu_ref_put_many(&ctx->refs, nr - submitted);
-	if (link)
-		io_queue_link_head(link);
 
 	io_submit_end(ctx);
 	if (nr > IO_PLUG_THRESHOLD)
-- 
2.24.0