在对元数据做任何改变以前，文件系统驱动程序会向日志中写入一个条目，这个条目描述了它将要做些什么。

Before the filesystem driver makes any changes to the meta-data, it writes an entry to the journal that describes what it's about to do.

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或者，也许这种数据正在写入一个应用程序或者系统日志。

Or perhaps it is already being written to an application or the system logs.

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在这种情况下，提交时日志写入的开销会分散到多个应用程序。

In this situation the overhead of a log write at commit time is Shared amongst many applications.

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