Re: [RFC PATCH v2 2/4] rust: io_uring: introduce rust abstraction for io-uring cmd

[Daniel Almeida]

> 
> There is `uring_cmd` callback in `file_operation` at c side. `Pin<&mut IoUringCmd>`
> would be create in the callback function. But the callback function could be
> called repeatedly with same `io_uring_cmd` instance as far as I know.
> 
> But in c side, there is initialization step `io_uring_cmd_prep()`.
> How about fill zero pdu in `io_uring_cmd_prep()`? And we could assign a byte
> as flag in pdu for checking initialized also we should provide 31 bytes except
> a byte for the flag.
> 

That was a follow-up question of mine. Can’t we enforce zero-initialization
in C to get rid of this MaybeUninit? Uninitialized data is just bad in general.

Hopefully this can be done as you've described above, but I don't want to over
extend my opinion on something I know nothing about.

— Daniel