linux-kernel - Re: [PATCH v4 2/3] rust: block: add rnull, Rust null

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Date: Sun, 2 Jun 2024 04:49:21 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Keith Busch <kbusch@...nel.org>
Cc: Andreas Hindborg <nmi@...aspace.dk>, Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>, Damien Le Moal <dlemoal@...nel.org>,
	Bart Van Assche <bvanassche@....org>,
	Hannes Reinecke <hare@...e.de>, Ming Lei <ming.lei@...hat.com>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	Andreas Hindborg <a.hindborg@...sung.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>,
	Niklas Cassel <Niklas.Cassel@....com>,
	Philipp Stanner <pstanner@...hat.com>,
	Conor Dooley <conor@...nel.org>,
	Johannes Thumshirn <Johannes.Thumshirn@....com>,
	Matias Bjørling <m@...rling.me>,
	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: [PATCH v4 2/3] rust: block: add rnull, Rust null_blk
 implementation

On Sat, Jun 01, 2024 at 10:01:40AM -0600, Keith Busch wrote:
> It's fine, just wondering why it's there. But it also allows values like
> 1536 and 3584, which are not valid block sizes, so I think you want the
> check to be:
> 
> 	if !(512..=4096).contains(&block_size) || ((block_size & (block_size - 1)) != 0)

I'd drop the range check.  We're pretty close to landing the bs>PS
patches, so just

	if block_size & block_size - 1 != 0

should be enough of a validation.  Is it considered "good style" in
Rust to omit the brackets here?