Add a flag to enable or disable aio_write (#10394)

* Add a flag to enable or disable aio_write

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix e2e test for aio_write

Signed-off-by: z1cheng <imchench@gmail.com>

* Remove redundant spaces to fix the 2e test

Signed-off-by: z1cheng <imchench@gmail.com>

---------

Signed-off-by: z1cheng <imchench@gmail.com>

test/e2e/settings/aio_write.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package settings
+
+import (
+	"strings"
+
+	"github.com/onsi/ginkgo/v2"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.DescribeSetting("aio-write", func() {
+	f := framework.NewDefaultFramework("aio-write")
+
+	ginkgo.It("should be enabled by default", func() {
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return strings.Contains(cfg, "aio_write on")
+			})
+	})
+
+	ginkgo.It("should be enabled when setting is true", func() {
+		f.UpdateNginxConfigMapData("enable-aio-write", "true")
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return strings.Contains(cfg, "aio_write on")
+			})
+	})
+
+	ginkgo.It("should be disabled when setting is false", func() {
+		f.UpdateNginxConfigMapData("enable-aio-write", "false")
+
+		f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return !strings.Contains(cfg, "aio_write on")
+			})
+	})
+})