[PATCH V4 2/8] io_uring: add io_submit_fail_link() helper

[Ming Lei <ming.lei@redhat.com>]

Add io_submit_fail_link() helper and put linking fail logic into this
helper.

This way simplifies io_submit_fail_init(), and becomes easier to add
sqe group failing logic.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 io_uring/io_uring.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 617ee97bb3f2..5d69851b5131 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2095,22 +2095,17 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
 	return def->prep(req, sqe);
 }
 
-static __cold int io_submit_fail_init(const struct io_uring_sqe *sqe,
+static __cold int io_submit_fail_link(struct io_submit_link *link,
 				      struct io_kiocb *req, int ret)
 {
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_submit_link *link = &ctx->submit_state.link;
 	struct io_kiocb *head = link->head;
 
-	trace_io_uring_req_failed(sqe, req, ret);
-
 	/*
 	 * Avoid breaking links in the middle as it renders links with SQPOLL
 	 * unusable. Instead of failing eagerly, continue assembling the link if
 	 * applicable and mark the head with REQ_F_FAIL. The link flushing code
 	 * should find the flag and handle the rest.
 	 */
-	req_fail_link_node(req, ret);
 	if (head && !(head->flags & REQ_F_FAIL))
 		req_fail_link_node(head, -ECANCELED);
 
@@ -2129,9 +2124,24 @@ static __cold int io_submit_fail_init(const struct io_uring_sqe *sqe,
 	else
 		link->head = req;
 	link->last = req;
+
 	return 0;
 }
 
+static __cold int io_submit_fail_init(const struct io_uring_sqe *sqe,
+				      struct io_kiocb *req, int ret)
+{
+	struct io_ring_ctx *ctx = req->ctx;
+	struct io_submit_link *link = &ctx->submit_state.link;
+
+	trace_io_uring_req_failed(sqe, req, ret);
+
+	req_fail_link_node(req, ret);
+
+	/* cover both linked and non-linked request */
+	return io_submit_fail_link(link, req, ret);
+}
+
 /*
  * Return NULL if nothing to be queued, otherwise return request for queueing */
 static struct io_kiocb *io_link_sqe(struct io_submit_link *link,
-- 
2.42.0