linux-kernel - Re: [PATCH for-6.18/block 15/16] block: fix reordered IO in the case recursive split

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Message-ID: <a7ad5eb2-d64c-4d45-817a-f590100ab970@acm.org>
Date: Fri, 5 Sep 2025 13:51:38 -0700
From: Bart Van Assche <bvanassche@....org>
To: Yu Kuai <yukuai1@...weicloud.com>, hch@...radead.org, colyli@...nel.org,
 hare@...e.de, dlemoal@...nel.org, tieren@...as.com, axboe@...nel.dk,
 tj@...nel.org, josef@...icpanda.com, song@...nel.org, yukuai3@...wei.com,
 satyat@...gle.com, ebiggers@...gle.com, kmo@...erainc.com,
 akpm@...ux-foundation.org, neil@...wn.name
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-raid@...r.kernel.org, yi.zhang@...wei.com,
 yangerkun@...wei.com, johnny.chenyi@...wei.com
Subject: Re: [PATCH for-6.18/block 15/16] block: fix reordered IO in the case
 recursive split

On 9/5/25 12:06 AM, Yu Kuai wrote:
> Currently, split bio will be chained to original bio, and original bio
> will be resubmitted to the tail of current->bio_list, waiting for
> split bio to be issued. However, if split bio get split again, the IO
> order will be messed up. This problem, on the one hand, will cause
> performance degradation, especially for mdraid will large IO size; on
> the other hand, will cause write errors for zoned block devices[1].

Reviewed-by: Bart Van Assche <bvanassche@....org>