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A call file.Sync on OSX doesn't guarantee actual persistence on physical drive media as the data can be cached in physical drive's buffers. Hence calls to file.Sync need to be replaced with fcntl(F_FULLFSYNC).
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
// Copyright 2016 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build darwin
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package fileutil
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import (
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"os"
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"syscall"
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)
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// Fsync on HFS/OSX flushes the data on to the physical drive but the drive
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// may not write it to the persistent media for quite sometime and it may be
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// written in out-of-order sequence. Using F_FULLFSYNC ensures that the
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// physical drive's buffer will also get flushed to the media.
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func Fsync(f *os.File) error {
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_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(syscall.F_FULLFSYNC), uintptr(0))
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if errno == 0 {
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return nil
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}
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return errno
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}
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// Fdatasync on darwin platform invokes fcntl(F_FULLFSYNC) for actual persistence
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// on physical drive media.
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func Fdatasync(f *os.File) error {
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return Fsync(f)
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}
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