linux-kernel - Re: [PATCH] block: fix disordered IO in the case recursive split

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Message-ID: <aKbcM1XDEGeay6An@infradead.org>
Date: Thu, 21 Aug 2025 01:43:31 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: axboe@...nel.dk, neil@...wn.name, akpm@...ux-foundation.org,
	linux-block@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, colyli@...nel.org, xni@...hat.com,
	yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: Re: [PATCH] block: fix disordered IO in the case recursive split

On Thu, Aug 21, 2025 at 03:47:06PM +0800, Yu Kuai wrote:
> +	if (current->bio_list) {
> +		if (bio_flagged(bio, BIO_CHAIN))
> +			bio_list_add_head(&current->bio_list[0], bio);
> +		else
> +			bio_list_add(&current->bio_list[0], bio);
> +	} else if (!bdev_test_flag(bio->bi_bdev, BD_HAS_SUBMIT_BIO)) {

This breaks all the code the already chains the right way around,
and there's quite a bit of that (speaking as someone who created a few
instances).

So instead fix your submitter to chain the right way instead.