用特殊的系统调用(即对UNIX内核的请求)分配和释放内存并设置权限；通过一般的读写操作读写内存段中的数据。

Special system calls, or requests to the UNIX kernel, allocate and free the memory and set permissions; common read and write operations put and get data from the region.

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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。

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

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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。

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

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