linux-kernel - Re: [PATCH v3 01/10] rust: fs: add new type file::Offset

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Message-ID: <aPtt5XyE_pBoiarD@google.com>
Date: Fri, 24 Oct 2025 12:15:33 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, ojeda@...nel.org, 
	alex.gaynor@...il.com, boqun.feng@...il.com, gary@...yguo.net, 
	bjorn3_gh@...tonmail.com, lossin@...nel.org, a.hindborg@...nel.org, 
	tmgross@...ch.edu, mmaurer@...gle.com, rust-for-linux@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v3 01/10] rust: fs: add new type file::Offset

On Wed, Oct 22, 2025 at 04:30:35PM +0200, Danilo Krummrich wrote:
> Add a new type for file offsets, i.e. bindings::loff_t. Trying to avoid
> using raw bindings types, this seems to be the better alternative
> compared to just using i64.
> 
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: Christian Brauner <brauner@...nel.org>
> Cc: Jan Kara <jack@...e.cz>
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>
> ---
>  rust/kernel/fs/file.rs | 142 ++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 141 insertions(+), 1 deletion(-)
> 
> diff --git a/rust/kernel/fs/file.rs b/rust/kernel/fs/file.rs
> index cf06e73a6da0..681b8a9e5d52 100644
> --- a/rust/kernel/fs/file.rs
> +++ b/rust/kernel/fs/file.rs
> @@ -15,7 +15,147 @@
>      sync::aref::{ARef, AlwaysRefCounted},
>      types::{NotThreadSafe, Opaque},
>  };
> -use core::ptr;
> +use core::{num::TryFromIntError, ptr};
> +
> +/// Representation of an offset within a [`File`].
> +///
> +/// Transparent wrapper around `bindings::loff_t`.
> +#[repr(transparent)]
> +#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Default)]
> +pub struct Offset(bindings::loff_t);

There is no invariant on this type, so the field can be public.

	pub struct Offset(pub bindings::loff_t);

Otherwise LGTM:
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>

Alice