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

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Message-ID: <aKbgqoF0UN4_FbXO@infradead.org>
Date: Thu, 21 Aug 2025 02:02:34 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Christoph Hellwig <hch@...radead.org>, 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, yi.zhang@...wei.com,
	yangerkun@...wei.com, johnny.chenyi@...wei.com,
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] block: fix disordered IO in the case recursive split

On Thu, Aug 21, 2025 at 04:56:33PM +0800, Yu Kuai wrote:
> Can you give some examples as how to chain the right way?

fs/xfs/xfs_bio_io.c: xfs_rw_bdev
fs/xfs/xfs_buf.c: xfs_buf_submit_bio
fs/xfs/xfs_log.c: xlog_write_iclog

> BTW, for all
> the io split case, should this order be fixed? I feel we should, this
> disorder can happen on any stack case, where top max_sector is greater
> than stacked disk.

Yes, I've been trying get Bart to fix this for a while instead of
putting in a workaround very similar to the one proposed here,
but so far nothing happened.