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

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Message-ID: <f3c5067f-af90-4491-86c0-06eaa24e2946@acm.org>
Date: Thu, 21 Aug 2025 08:19:21 -0700
From: Bart Van Assche <bvanassche@....org>
To: Christoph Hellwig <hch@...radead.org>, 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,
 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 8/21/25 2:02 AM, Christoph Hellwig wrote:
> On Thu, Aug 21, 2025 at 04:56:33PM +0800, Yu Kuai wrote:
>> 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.

Does the above comment refer to the block/blk-crypto-fallback.c code? I
will leave it to Eric Biggers to move the bio splitting call from that
code into the filesystems that need it.

Bart.