Re: [PATCH v11 4/4] rust: Add `OwnableRefCounted`

["Benno Lossin" <lossin@kernel.org>]

On Mon Jul 7, 2025 at 1:12 PM CEST, Andreas Hindborg wrote:
> "Benno Lossin" <lossin@kernel.org> writes:
>> Ah right, I forgot about this. What was the refcount characteristics of
>> this again?
>>
>> *  1 = in flight, owned by C
>> *  2 = in flight, owned by Rust
>> * >2 = in flight, owned by Rust + additional references used by Rust
>>        code
>>
>> Correct? Maybe @Andreas can check.
>
> We have been a bit back and forth on this. This is how we would like it
> going forward:
>
>
> /// There are three states for a request that the Rust bindings care about:
> ///
> /// - 0: The request is owned by C block layer or is uniquely referenced (by [`Owned<_>`]).
> /// - 1: The request is owned by Rust abstractions but is not referenced.
> /// - 2+: There is one or more [`ARef`] instances referencing the request.

Huh, now I'm more confused... Could you go into the details again?

---
Cheers,
Benno