当设备节点（特殊文件）创建后，它使用的主设备号必须同内核内部使用的完全相同。
When the device node (special file) is created, it must sport the exact same major number that is used internally by the kernel.
原来的fakeroot设计只使用文件的设备和inode号来标识文件。
The original fakeroot design identified files only by their device and inode numbers.
原来的fakeroot设计只使用文件的设备和inode号来标识文件。
The original fakeroot design identified files only by their device and inode numbers.
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