linux-kernel - Re: [PATCH RFC v3 00/15] block: fix disordered IO in the case recursive split

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Message-ID: <130482e9-8363-6051-5fc6-549cf9aad57b@huaweicloud.com>
Date: Tue, 2 Sep 2025 09:50:50 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Bart Van Assche <bvanassche@....org>, 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, kmo@...erainc.com, satyat@...gle.com, ebiggers@...gle.com,
 neil@...wn.name, akpm@...ux-foundation.org
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,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RFC v3 00/15] block: fix disordered IO in the case
 recursive split

Hi,

在 2025/09/01 22:09, Bart Van Assche 写道:
> On 8/31/25 8:32 PM, Yu Kuai wrote:
>> This set is just test for raid5 for now, see details in patch 9;
> 
> Does this mean that this patch series doesn't fix reordering caused by
> recursive splitting for zoned block devices? A test case that triggers
> an I/O error is available here:
> https://lore.kernel.org/linux-block/a8a714c7-de3d-4cc9-8c23-38b8dc06f5bb@acm.org/ 
> 
I'll try this test.

zoned block device is bypassed in patch 14 by:

+		if (split && !bdev_is_zoned(bio->bi_bdev))
+			bio_list_add_head(&current->bio_list[0], bio);

If I can find a reporducer for zoned block, and verify that recursive
split can be fixed as well, I can remove the checking for zoned devices
in the next verison.

Thanks,
Kuai

> 
> I have not yet had the time to review this patch series but plan to take
> a look soon.
> 
> Thanks,
> 
> Bart.
> .
>