syncfs会等到光盘写入完成吗? [英] Does syncfs wait until disc write finished?

问题描述

新的syncfs系统调用是否像fsync一样在返回之前等待光盘写入完成? 另外，如果在修改文件后，是否为此文件描述符调用syncfs也更新了包含的directoy条目?

Does the new syncfs system call wait for disc write completion before returning, like in case of fsync? Also, if after modifying file, is calling syncfs for this file descriptor also update the containing directoy entry?

推荐答案

syncfs向下写入超级块中的所有脏页.磁盘可能具有写缓存，因此不能保证已保存所有数据.例如，您可以关闭电源而又不叫关机.

syncfs writes out all dirty pages from the superblock on down. Disks may have write caching, so this does not guarantee that all data has been saved. You could, for example, turn off power without still calling shutdown.

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