顺便说一下，初始化函数必须是文件中唯一未被声明为 static 的全局标识符。
The init function, by the way, should be the only global identifier in the file that isn't declared static.
文件中的所有行都是使用唯一ID标记的，并且所有的行都标有错误消息的标识符和类。
All the lines in the file are tagged with a unique id and all lines are tagged with the identifier and class of the error message.
Linux透视图中的一个文件会分配到一个来自元数据服务器的inode number (ino)，对于文件这是一个唯一的标识符。
A file from the Linux perspective is assigned an inode number (ino) from the metadata server, which is a unique identifier for the file.
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