vendor/go.etcd.io/etcd/pkg/fileutil/sync_linux.go

// Copyright 2016 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.

// +build linux

package fileutil

import (
	"os"
	"syscall"
)

// Fsync is a wrapper around file.Sync(). Special handling is needed on darwin platform.
func Fsync(f *os.File) error {
	return f.Sync()
}

// Fdatasync is similar to fsync(), but does not flush modified metadata
// unless that metadata is needed in order to allow a subsequent data retrieval
// to be correctly handled.
func Fdatasync(f *os.File) error {
	return syscall.Fdatasync(int(f.Fd()))
}