storj.io/minio@v0.0.0-20230509071714-0cbc90f649b1/pkg/disk/directio_unix.go (about)

     1  //go:build linux || netbsd || freebsd
     2  // +build linux netbsd freebsd
     3  
     4  /*
     5   * Minio Cloud Storage, (C) 2019-2020 Minio, Inc.
     6   *
     7   * Licensed under the Apache License, Version 2.0 (the "License");
     8   * you may not use this file except in compliance with the License.
     9   * You may obtain a copy of the License at
    10   *
    11   *     http://www.apache.org/licenses/LICENSE-2.0
    12   *
    13   * Unless required by applicable law or agreed to in writing, software
    14   * distributed under the License is distributed on an "AS IS" BASIS,
    15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16   * See the License for the specific language governing permissions and
    17   * limitations under the License.
    18   */
    19  
    20  package disk
    21  
    22  import (
    23  	"os"
    24  	"syscall"
    25  
    26  	"github.com/ncw/directio"
    27  	"golang.org/x/sys/unix"
    28  )
    29  
    30  // OpenFileDirectIO - bypass kernel cache.
    31  func OpenFileDirectIO(filePath string, flag int, perm os.FileMode) (*os.File, error) {
    32  	return directio.OpenFile(filePath, flag, perm)
    33  }
    34  
    35  // DisableDirectIO - disables directio mode.
    36  func DisableDirectIO(f *os.File) error {
    37  	fd := f.Fd()
    38  	flag, err := unix.FcntlInt(fd, unix.F_GETFL, 0)
    39  	if err != nil {
    40  		return err
    41  	}
    42  	flag = flag & ^(syscall.O_DIRECT)
    43  	_, err = unix.FcntlInt(fd, unix.F_SETFL, flag)
    44  	return err
    45  }
    46  
    47  // AlignedBlock - pass through to directio implementation.
    48  func AlignedBlock(BlockSize int) []byte {
    49  	return directio.AlignedBlock(BlockSize)
    50  }