可以使用虚拟内存设置中的几个参数实现这个目的。
There are several parameters within the virtual memory Settings that let us do this.
在创建虚拟系统时给出的映射必须为任何缺失的属性和参数提供值，并能另外提供值以覆盖默认值。
The map supplied when creating a virtual system must provide values for any missing properties and parameters, and can additionally supply values to override the default values.
然后就可以使用这个返回的指针来配置这个虚拟文件的其他参数，例如在对该文件执行读操作时应该调用的函数。
You can then use the return pointer to configure other aspects of the virtual file, such as the function to call when a read is performed on the file.
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