linux-kernel - Re: [PATCH rust-next 0/2] Add llseek support to miscdevice and samples

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Message-ID: <2025081818-presume-coral-25c3@gregkh>
Date: Mon, 18 Aug 2025 16:18:35 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Ryosuke Yasuoka <ryasuoka@...hat.com>
Cc: arnd@...db.de, 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, aliceryhl@...gle.com,
	tmgross@...ch.edu, dakr@...nel.org, lee@...nel.org,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH rust-next 0/2] Add llseek support to miscdevice and
 samples

On Mon, Aug 18, 2025 at 10:58:37PM +0900, Ryosuke Yasuoka wrote:
> This patch series introduces support for the llseek file operation to
> the Rust miscdevice abstraction.
> 
> The first patch, rust: miscdevice: add llseek support, extends the
> MiscDevice trait with a new llseek method.
> 
> The second patch, rust: samples: miscdevice: add lseek samples, add a
> simple example of how to use the new llseek feature. As currently the
> MiscDevice trait does not support any read/write file operation yet, the
> sample is fundamental one.

As read/write isn't there yet, why is llseek needed just yet?

thanks,

greg k-h