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memory vs mmap
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```
linux client: "yo fileserver I'm opening this file because I'm interested in reading its contents"
fileserver: "roger that, you want any data in particular?"
linux client: "give me 16384 bytes starting from byte 0"
fileserver: "here you go"
linux client: "thx, btw I'm caching this"
... time passes...
fileserver: "hey just fyi another client modified this file you're interested in"
linux client: "roger that, I'll invalidate my cache"
```

I'm not an nfs protocol expert and don't know if it looks anything like this, it's just a simple example of "technically possible."