The second parameter we passed 0, and it says to specify the number of bytes to create for the device extension.

第二个参数我们传0进去，这个参数是指定用来创建新设备扩展的字节数的。

youdao

I find it easiest to mimic the pattern of structure declaration used in the official DDK, so I declared this device extension as a structure with a tag as well as a type and pointer-to-type name.

很容易模仿在正式的DD K种使用的结构声明的模式，所以我把这个设备扩展名声明称一个结构，伴随标签和类型以及类型指针名称。

youdao

If the raw device is not large enough for the new chunk end offset, the extension will fail.

如果原始设备对于新块结束偏移量不够大，扩展就会失败。

youdao

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