When it comes time to write the data to disk, XFS can now allocate free space intelligently, in a way that optimizes filesystem performance.

到了要将数据写到磁盘的时候，XFS 能够以这种优化文件系统性能的方式，智能地分配空闲空间。

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LFS data structure, disk layout, free space management, access mechanism and segment cleaning mechanism were summarized.

本文综述了LFS的数据结构和磁盘布局，及空闲空间管理、读写机制、段清洁机制与策略等。

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