linux-kernel - Re: [RFC PATCH 0/5] Rust block device driver API and null block driver

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Message-ID: <ZfH6lTDQygFd1hz-@casper.infradead.org>
Date: Wed, 13 Mar 2024 19:12:21 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Bart Van Assche <bvanassche@....org>
Cc: Andreas Hindborg <nmi@...aspace.dk>, Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>, Keith Busch <kbusch@...nel.org>,
	Damien Le Moal <Damien.LeMoal@....com>,
	Hannes Reinecke <hare@...e.de>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Niklas Cassel <Niklas.Cassel@....com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...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>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Chaitanya Kulkarni <chaitanyak@...dia.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Yexuan Yang <1182282462@...t.edu.cn>,
	Sergio González Collado <sergio.collado@...il.com>,
	Joel Granados <j.granados@...sung.com>,
	"Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
	Daniel Gomez <da.gomez@...sung.com>,
	open list <linux-kernel@...r.kernel.org>,
	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
	"lsf-pc@...ts.linux-foundation.org" <lsf-pc@...ts.linux-foundation.org>,
	"gost.dev@...sung.com" <gost.dev@...sung.com>
Subject: Re: [RFC PATCH 0/5] Rust block device driver API and null block
 driver

On Wed, Mar 13, 2024 at 11:02:23AM -0700, Bart Van Assche wrote:
> On 3/13/24 04:05, Andreas Hindborg wrote:
> > This is the second version of the Rust block device driver API and the Rust null
> > block driver. The context and motivation can be seen in cover letter of the RFC
> > v1 [1]. If more context is required, a talk about this effort was recorded at
> > LPC [2]. I hope to be able to discuss this series at LSF this year [3].
> 
> Memory safety may land in C++ in the near future (see also
> https://herbsutter.com/2024/03/). If memory-safe C++ or memory-safe C
> would be adopted in the kernel, it would allow writing memory-safe
> drivers without having to add complicated bindings between existing C
> code and new Rust code. Please do not take this as personal criticism -
> I appreciate the effort that has been spent on coming up with great
> Rust bindings for the Linux kernel block layer.

You know, this reminds me of when I was at Intel working on NVMe.
We had a product all ready to ship and a manager suggested that we delay
shipping it until the SCSI-over-PCI standard was finished and ratified
so that the same piece of silicon could support both.

Fortunately, said manager was overruled, but it's a great example of
how this kind of FUD can actually work.