这个问题之所以在XFS 1.0中更加频繁的发生，原因在于对某类元数据的更新必须按照其发生的顺序记录到文件系统中。
The problem manifested itself much more often with XFS 1.0 because certain kinds metadata updates were required to be recorded to the filesystem in the order that they occured.
总之，日志文件系统就是一种具有故障恢复能力的文件系统，它利用日志来记录尚未提交到文件系统的修改，以防止元数据破坏(请参见图1)。
To sum up, journaling file systems are fault-resilient file systems that use a journal to log changes before they're committed to the file system to avoid metadata corruption (see Figure 1).
使用 ReiserFS、XFS 和 JFS 时，文件系统驱动程序记录 元数据，但不提供 数据日志记录。
With ReiserFS, XFS, and JFS, the filesystem driver journals metadata, but makes no provisions for journaling data.
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