From 528d1ef693339fd87ec9c72ec61a515592cd59da Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 15 Apr 2021 17:33:41 +0800
Subject: [PATCH] io_uring: break links for failed defer

mainline inclusion
from mainline-5.5-rc1
commit d3b35796b1e3f118017491d621f624e0de7ff9fb
category: feature
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27
CVE: NA
---------------------------

If io_req_defer() failed, it needs to cancel a dependant link.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: yangerkun <yangerkun@huawei.com>
Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
---
 fs/io_uring.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index b18844ca8484..3e223d0cd26b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2957,6 +2957,8 @@ static void io_queue_sqe(struct io_kiocb *req)
 	if (ret) {
 		if (ret != -EIOCBQUEUED) {
 			io_cqring_add_event(req, ret);
+			if (req->flags & REQ_F_LINK)
+				req->flags |= REQ_F_FAIL_LINK;
 			io_double_put_req(req);
 		}
 	} else
@@ -2989,6 +2991,8 @@ static void io_queue_link_head(struct io_kiocb *req, struct io_kiocb *shadow)
 		if (ret != -EIOCBQUEUED) {
 err:
 			io_cqring_add_event(req, ret);
+			if (req->flags & REQ_F_LINK)
+				req->flags |= REQ_F_FAIL_LINK;
 			io_double_put_req(req);
 			if (shadow)
 				__io_free_req(shadow);
-- 
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