1、It is not equivalent to fsync — it's not a request to sync dirty data.
2、它并不等于fsync函数——也不是请求同步脏数据。
3、aio_fsync()的目的与fsync()相同：确保所有未决的数据都写入到磁盘了。
4、The aio_fsync() method serves the same purpose as the fsync() method; its purpose is to ensure that all pending data are written to disk.
