JFFS2通过维护块列表来充分地对设备执行平均读写。
JFFS2 maintains block lists to sufficiently wear-level the device.
它们存储和检索数据块(受客户端或者namenode通知)，并且周期性的向namenode报告它们所存储的块列表信息。
They store and retrieve blocks when they are told to (by clients or the namenode), and they report back to the namenode periodically with lists of blocks that they are storing.
只为已经添加到事件列表中的控制块提供服务。
Only control blocks that have been added to an event list are serviced.
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