linux-kernel - Re: [PATCH v2 5/7] rust: file: add `Kuid` wrapper

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Date:   Mon, 11 Dec 2023 10:58:36 -0500
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Benno Lossin <benno.lossin@...ton.me>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        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 v2 5/7] rust: file: add `Kuid` wrapper

On Fri, Dec 08, 2023 at 08:43:19AM -0800, Boqun Feng wrote:
> On Fri, Dec 08, 2023 at 04:40:09PM +0000, Benno Lossin wrote:
> > On 12/6/23 12:59, Alice Ryhl wrote:
> > > +    /// Returns the given task's pid in the current pid namespace.
> > > +    pub fn pid_in_current_ns(&self) -> Pid {
> > > +        // SAFETY: Calling `task_active_pid_ns` with the current task is always safe.
> > > +        let namespace = unsafe { bindings::task_active_pid_ns(bindings::get_current()) };
> > 
> > Why not create a safe wrapper for `bindings::get_current()`?
> > This patch series has three occurrences of `get_current`, so I think it
> > should be ok to add a wrapper.
> > I would also prefer to move the call to `bindings::get_current()` out of
> > the `unsafe` block.
> 
> FWIW, we have a current!() macro, we should use it here.

Why does it need to be a macro?