55 lines
1.8 KiB
Go
55 lines
1.8 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package checkpoint
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import (
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"os"
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"syscall"
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)
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const (
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_FILE_FLAG_WRITE_THROUGH = 0x80000000
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)
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func create(path string) (*os.File, error) {
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return createWriteThroughFile(path)
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}
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// createWriteThroughFile creates a file whose write operations do not go
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// through any intermediary cache, they go directly to disk.
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func createWriteThroughFile(path string) (*os.File, error) {
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if len(path) == 0 {
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return nil, syscall.ERROR_FILE_NOT_FOUND
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}
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pathp, err := syscall.UTF16PtrFromString(path)
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if err != nil {
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return nil, err
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}
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h, err := syscall.CreateFile(
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pathp, // Path
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syscall.GENERIC_READ|syscall.GENERIC_WRITE, // Access Mode
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uint32(syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE), // Share Mode
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nil, // Security Attributes
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syscall.CREATE_ALWAYS, // Create Mode
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uint32(syscall.FILE_ATTRIBUTE_NORMAL|_FILE_FLAG_WRITE_THROUGH), // Flags and Attributes
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0) // Template File
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return os.NewFile(uintptr(h), path), err
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}
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