ext3使用空闲空间位映射来分配文件，这种方式不是很快，并且伸缩性不强。

Files were allocated using a bit map of free space, which was not very fast nor very scalable.

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正如我们在前一节中讨论的，根据logfilsiz参数为所创建的每个日志文件分配相同的空间。

As we discussed in the previous section, each log file created will have the same allocation of space based upon the logfilsiz parameter.

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其 readAttributes() 方法返回一个包含文件存储的整个空间、未分配空间、以及已使用空间细节的 FileStoreSpaceAttributes 实例。

Its readAttributes() method returns a FileStoreSpaceAttributes instance containing details of the total space, the unallocated space, and the usable space on the file store.

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