diff --git a/client/pkg/fileutil/filereader.go b/client/pkg/fileutil/filereader.go
new file mode 100644
index 000000000..55248888c
--- /dev/null
+++ b/client/pkg/fileutil/filereader.go
@@ -0,0 +1,60 @@
+// Copyright 2022 The etcd 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 fileutil
+
+import (
+	"bufio"
+	"io"
+	"io/fs"
+	"os"
+)
+
+// FileReader is a wrapper of io.Reader. It also provides file info.
+type FileReader interface {
+	io.Reader
+	FileInfo() (fs.FileInfo, error)
+}
+
+type fileReader struct {
+	*os.File
+}
+
+func NewFileReader(f *os.File) FileReader {
+	return &fileReader{f}
+}
+
+func (fr *fileReader) FileInfo() (fs.FileInfo, error) {
+	return fr.Stat()
+}
+
+// FileBufReader is a wrapper of bufio.Reader. It also provides file info.
+type FileBufReader struct {
+	*bufio.Reader
+	fi fs.FileInfo
+}
+
+func NewFileBufReader(fr FileReader) *FileBufReader {
+	bufReader := bufio.NewReader(fr)
+	fi, err := fr.FileInfo()
+	if err != nil {
+		// This should never happen.
+		panic(err)
+	}
+	return &FileBufReader{bufReader, fi}
+}
+
+func (fbr *FileBufReader) FileInfo() fs.FileInfo {
+	return fbr.fi
+}
diff --git a/client/pkg/fileutil/filereader_test.go b/client/pkg/fileutil/filereader_test.go
new file mode 100644
index 000000000..2f863cdce
--- /dev/null
+++ b/client/pkg/fileutil/filereader_test.go
@@ -0,0 +1,44 @@
+// Copyright 2022 The etcd 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 fileutil
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFileBufReader(t *testing.T) {
+	f, err := os.CreateTemp(t.TempDir(), "wal")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	fi, err := f.Stat()
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	fbr := NewFileBufReader(NewFileReader(f))
+
+	if !strings.HasPrefix(fbr.FileInfo().Name(), "wal") {
+		t.Errorf("Unexpected file name: %s", fbr.FileInfo().Name())
+	}
+	assert.Equal(t, fi.Size(), fbr.FileInfo().Size())
+	assert.Equal(t, fi.IsDir(), fbr.FileInfo().IsDir())
+	assert.Equal(t, fi.Mode(), fbr.FileInfo().Mode())
+	assert.Equal(t, fi.ModTime(), fbr.FileInfo().ModTime())
+}
diff --git a/client/pkg/go.mod b/client/pkg/go.mod
index 425d437e0..f30aef331 100644
--- a/client/pkg/go.mod
+++ b/client/pkg/go.mod
@@ -4,6 +4,7 @@ go 1.16
 
 require (
 	github.com/coreos/go-systemd/v22 v22.3.2
+	github.com/stretchr/testify v1.7.0
 	go.uber.org/zap v1.17.0
 	golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57
 )
diff --git a/client/pkg/go.sum b/client/pkg/go.sum
index a271115ad..8bc5e2f04 100644
--- a/client/pkg/go.sum
+++ b/client/pkg/go.sum
@@ -20,6 +20,7 @@ go.uber.org/zap v1.17.0 h1:MTjgFu6ZLKvY6Pvaqk97GlxNBuMpV4Hy/3P6tRGlI2U=
 go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
 golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57 h1:F5Gozwx4I1xtr/sr/8CFbb57iKi3297KFs0QDbGN60A=
 golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=