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A comment on Pingfs: A filesystem where data is stored as ICMP Echo packets (2016).
Only looked at the read path, which is roughly:
* filesystem receives read
* blocks on a semaphore (https://github.com/yarrick/pingfs/blob/master/chunk.c#L141)
* network thread wakes up semaphore when ICMP reply containing data is received
* filesystem thread copies data into new buffer to return from syscall
* filesystem relinquishes chunk back to network thread, which wakes up, sends it back to be echoed on the network via ICMP, and frees the in-memory buffer (https://github.com/yarrick/pingfs/blob/master/chunk.c#L107)
How silly :)
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Only looked at the read path, which is roughly:
* filesystem receives read
* blocks on a semaphore (https://github.com/yarrick/pingfs/blob/master/chunk.c#L141)
* network thread wakes up semaphore when ICMP reply containing data is received
* filesystem thread copies data into new buffer to return from syscall
* filesystem relinquishes chunk back to network thread, which wakes up, sends it back to be echoed on the network via ICMP, and frees the in-memory buffer (https://github.com/yarrick/pingfs/blob/master/chunk.c#L107)
How silly :)