fix windows compile error for directio pkg

directio/proxy.go

@@ -1,4 +1,4 @@
-// Copyright 2015 PingCAP, Inc.
+// Copyright 2022 PingCAP, Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,11 +16,7 @@
 package directio
 
 import (
-	"errors"
-	"os"
-
 	"github.com/ncw/directio"
-	"golang.org/x/sys/unix"
 )
 
 const (
@@ -33,14 +29,3 @@ const (
 // AlignedBlock returns []byte of size BlockSize aligned to a multiple
 // of AlignSize in memory (must be power of two)
 var AlignedBlock = directio.AlignedBlock
-
-// OpenFile tries to open file in directio mode. If the file system doesn't support directio,
-// it will fallback to open the file directly (without O_DIRECT)
-func OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
-	file, err := directio.OpenFile(name, flag, perm)
-	if errors.Is(err, unix.EINVAL) {
-		return os.OpenFile(name, flag, perm)
-	}
-
-	return file, err
-}

directio/proxy_linux.go

@@ -0,0 +1,36 @@
+// Copyright 2023 PingCAP, Inc.
+//
+// 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.
+
+// directio is a proxy package for github.com/pingcap/badger/directio
+package directio
+
+import (
+	"errors"
+	"os"
+
+	"github.com/ncw/directio"
+	"golang.org/x/sys/unix"
+)
+
+// OpenFile tries to open file in directio mode. If the file system doesn't support directio,
+// it will fallback to open the file directly (without O_DIRECT)
+func OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
+	file, err := directio.OpenFile(name, flag, perm)
+
+	if errors.Is(err, unix.EINVAL) {
+		return os.OpenFile(name, flag, perm)
+	}
+
+	return file, err
+}

directio/proxy_other.go

@@ -0,0 +1,24 @@
+// Copyright 2023 PingCAP, Inc.
+//
+// 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.
+
+//go:build !linux
+
+package directio
+
+import (
+	"github.com/ncw/directio"
+)
+
+// TODO: check the errors and fallback for the systems besides linux
+var OpenFile = directio.OpenFile