snapshots|pkg: umount without DETACH and nosync after umount

Signed-off-by: Wei Fu <fuweid89@gmail.com>

pkg/testutil/helpers.go

@@ -28,6 +28,8 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+const umountflags int = 0
+
 var rootEnabled bool
 
 func init() {

pkg/testutil/mount_linux.go

@@ -1,21 +0,0 @@
-/*
-   Copyright The containerd 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 testutil
-
-import "golang.org/x/sys/unix"
-
-const umountflags int = unix.MNT_DETACH

pkg/testutil/mount_other.go

@@ -1,22 +0,0 @@
-//go:build !linux
-// +build !linux
-
-/*
-   Copyright The containerd 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 testutil
-
-const umountflags int = 0