linux-kernel - Re: [PATCH v5 2/4] rust: debugfs: Bind file creation for long-lived Display

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Message-ID: <CAH5fLggovWEOctW2rYnAszSzpUMCammvH2+8-sQ0eypEbhSa3A@mail.gmail.com>
Date: Fri, 9 May 2025 14:56:05 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Matthew Maurer <mmaurer@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...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@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Timur Tabi <ttabi@...dia.com>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v5 2/4] rust: debugfs: Bind file creation for long-lived Display

On Tue, May 6, 2025 at 1:51 AM Matthew Maurer <mmaurer@...gle.com> wrote:
>
> Allows creation of files for references that live forever and lack
> metadata through the `Display` implementation.
>
> The reference must live forever because we do not have a maximum
> lifetime for the file we are creating.
>
> The `Display` implementation is used because `seq_printf` needs to route
> through `%pA`, which in turn routes through Arguments. A more generic
> API is provided later in the series, implemented in terms of this one.
>
> Signed-off-by: Matthew Maurer <mmaurer@...gle.com>

I believe it should be possible to bind owned data to a `File` using a
signature like this:

fn create_file<T>(&self, name: &CStr, data: impl PinInit<T>) -> impl
PinInit<FileWithData<T>>