github.com/pingcap/badger@v1.5.1-0.20230103063557-828f39b09b6d/directio/proxy_linux.go (about)

     1  // Copyright 2023 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // directio is a proxy package for github.com/pingcap/badger/directio
    16  package directio
    17  
    18  import (
    19  	"errors"
    20  	"os"
    21  
    22  	"github.com/ncw/directio"
    23  	"golang.org/x/sys/unix"
    24  )
    25  
    26  // OpenFile tries to open file in directio mode. If the file system doesn't support directio,
    27  // it will fallback to open the file directly (without O_DIRECT)
    28  func OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
    29  	file, err := directio.OpenFile(name, flag, perm)
    30  
    31  	if errors.Is(err, unix.EINVAL) {
    32  		return os.OpenFile(name, flag, perm)
    33  	}
    34  
    35  	return file, err
    36  }