Question about the function "spec_freeblks" in 5.4

Hello, everyone.

I happened to see the code of "spec_freeblks" , and I am curious if
the code works in real world? In my opinion, it means to delete the
content of blocks in special files. But I don't think it can finish
this destination actually.

Am I right? Cause as a newcomer to the source code, I am not quite
confident about myself.
Waiting for your advice.

Thanks. 
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