linux-kernel - Re: [PATCH v2 1/7] rust: file: add Rust abstraction for `struct file`

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Message-ID: <20231211153423.4160836-1-aliceryhl@google.com>
Date:   Mon, 11 Dec 2023 15:34:23 +0000
From:   Alice Ryhl <aliceryhl@...gle.com>
To:     benno.lossin@...ton.me
Cc:     a.hindborg@...sung.com, alex.gaynor@...il.com,
        aliceryhl@...gle.com, arve@...roid.com, bjorn3_gh@...tonmail.com,
        boqun.feng@...il.com, brauner@...nel.org, cmllamas@...gle.com,
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        gregkh@...uxfoundation.org, joel@...lfernandes.org,
        keescook@...omium.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, maco@...roid.com, ojeda@...nel.org,
        peterz@...radead.org, rust-for-linux@...r.kernel.org,
        surenb@...gle.com, tglx@...utronix.de, tkjos@...roid.com,
        viro@...iv.linux.org.uk, wedsonaf@...il.com, willy@...radead.org
Subject: Re: [PATCH v2 1/7] rust: file: add Rust abstraction for `struct file`

Benno Lossin <benno.lossin@...ton.me> wrutes:
> > +        // SAFETY: `fget` either returns null or a valid pointer to a file, and we checked for null
> > +        // above.
> 
> Since now both the Rust and C functions are called `fget`, I think you
> should refer to `bindings::fget`.
> [...]
> > +    unsafe fn dec_ref(obj: ptr::NonNull<Self>) {
> > +        // SAFETY: The safety requirements guarantee that the refcount is nonzero.
> > +        unsafe { bindings::fput(obj.cast().as_ptr()) }
> 
> The comment should also justify the cast.

I'll make both changes.

Alice