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

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Message-ID: <aKwpvfDLgeNaGjnF@infradead.org>
Date: Mon, 25 Aug 2025 02:15:41 -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, tieren@...as.com,
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] block: fix disordered IO in the case recursive split

On Mon, Aug 25, 2025 at 02:15:49PM +0800, Yu Kuai wrote:
> > be resubmitted to current->bio_list, hence this patch won't break this
> > case, right?
> 
> And xfs_rw_bdev() is not under submit_bio() context, current->bio_list
> is still NULL, means xfs_rw_bdev() is submitting bio one by one in the
> right lba order, the bio recursive handling is not related in this case.

Yes, usually not - unless we somehow eventually get the loop device
out a separate workque context.