frostfs-s3-gw/pkg/disk/directio_unix.go

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// +build linux netbsd freebsd
/*
* Minio Cloud Storage, (C) 2019-2020 Minio, 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.
*/
package disk
import (
"os"
"syscall"
"github.com/ncw/directio"
"golang.org/x/sys/unix"
)
// OpenFileDirectIO - bypass kernel cache.
func OpenFileDirectIO(filePath string, flag int, perm os.FileMode) (*os.File, error) {
return directio.OpenFile(filePath, flag, perm)
}
// DisableDirectIO - disables directio mode.
func DisableDirectIO(f *os.File) error {
fd := f.Fd()
flag, err := unix.FcntlInt(fd, unix.F_GETFL, 0)
if err != nil {
return err
}
flag = flag & ^(syscall.O_DIRECT)
_, err = unix.FcntlInt(fd, unix.F_SETFL, flag)
return err
}
// AlignedBlock - pass through to directio implementation.
func AlignedBlock(BlockSize int) []byte {
return directio.AlignedBlock(BlockSize)
}