minio/pkg/disk/fdatasync_linux.go at ilm · ggbg/minio

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// +build linux

* 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"

)

// Fdatasync - fdatasync() is similar to fsync(), but does not flush modified metadata

// unless that metadata is needed in order to allow a subsequent data retrieval

// to be correctly handled. For example, changes to st_atime or st_mtime

// (respectively, time of last access and time of last modification; see inode(7))

// do not require flushing because they are not necessary for a subsequent data

// read to be handled correctly. On the other hand, a change to the file size

// (st_size, as made by say ftruncate(2)), would require a metadata flush.

// The aim of fdatasync() is to reduce disk activity for applications that

// do not require all metadata to be synchronized with the disk.

func Fdatasync(f *os.File) error {

return syscall.Fdatasync(int(f.Fd()))

}