linux-kernel - Re: [PATCH v4 2/4] rust: debugfs: Bind file creation for long-lived Display

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Message-ID: <aBYPsZe3i_JrBJgz@polis>
Date: Sat, 3 May 2025 14:44:33 +0200
From: Danilo Krummrich <dakr@...nel.org>
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>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	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 v4 2/4] rust: debugfs: Bind file creation for long-lived
 Display

On Fri, May 02, 2025 at 07:49:31PM +0000, Matthew Maurer wrote:
> +/// Handle to a DebugFS file.
> +#[repr(transparent)]
> +pub struct File<'a>(Dir<'a, true>);

As mentioned in [1], please create a base type Entry. While it's an improvement
to not expose things like subdir() from File directly, it's still odd to base
File on a type that has invalid methods its purpose.

[1] https://lore.kernel.org/lkml/aBRrniLfCzWX7nbR@pollux/

> +impl<'a> File<'a> {
> +    /// Remove the file from DebugFS.
> +    ///
> +    /// # Examples
> +    /// ```
> +    /// # use kernel::c_str;
> +    /// # use kernel::debugfs::Dir;
> +    /// let dir = Dir::new(c_str!("foo"));
> +    /// let file = dir.display_file(c_str!("bar"), &0);
> +    /// // "foo/bar" is created.
> +    /// file.remove()
> +    /// // "foo/bar" is removed"
> +    pub fn remove(self) {
> +        drop(self.0.owning())
> +    }

Same as with Dir, please make it the other way around.