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块设备驱动。为Linux设计一个设备驱动程序，该驱动程序能够用内存来模拟一个1MB的磁盘-Block device drivers

块设备驱动。为Linux设计一个设备驱动程序，该驱动程序能够用内存来模拟一个1MB的磁盘-Block device drivers