linux-kernel - Re: [PATCH 5/7] rust: file: add `Kuid` wrapper

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Date:   Wed, 29 Nov 2023 17:48:15 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Carlos Llamas <cmllamas@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        rust-for-linux@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 5/7] rust: file: add `Kuid` wrapper

On Wed, Nov 29, 2023 at 05:28:27PM +0100, Christian Brauner wrote:

> > +pid_t rust_helper_task_tgid_nr_ns(struct task_struct *tsk,
> > +				  struct pid_namespace *ns)
> > +{
> > +	return task_tgid_nr_ns(tsk, ns);
> > +}
> > +EXPORT_SYMBOL_GPL(rust_helper_task_tgid_nr_ns);
> 
> I'm a bit puzzled by all these rust_helper_*() calls. Can you explain
> why they are needed? Because they are/can be static inlines and that
> somehow doesn't work?

Correct, because Rust can only talk to C ABI, it cannot use C headers.
Bindgen would need to translate the full C headers into valid Rust for
that to work.

I really think the Rust peoples should spend more effort on that,
because you are quite right, all this wrappery is tedious at best.