linux-kernel - Re: [PATCH -next 0/2] block: fix scan partition for exclusively open device again

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Date:   Wed, 22 Mar 2023 10:02:28 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Ming Lei <ming.lei@...hat.com>, Yu Kuai <yukuai1@...weicloud.com>
Cc:     jack@...e.cz, hare@...e.de, hch@...radead.org, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        Changhui Zhong <czhong@...hat.com>,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next 0/2] block: fix scan partition for exclusively open
 device again

Hi,

在 2023/03/22 9:34, Ming Lei 写道:
> On Wed, Mar 22, 2023 at 09:26:07AM +0800, Yu Kuai wrote:
>> Hi,
>>
>> 在 2023/03/21 19:43, Ming Lei 写道:
>>> On Fri, Feb 17, 2023 at 10:21:58AM +0800, Yu Kuai wrote:
>>>> From: Yu Kuai <yukuai3@...wei.com>
>>>>
>>>> Changes from RFC:
>>>>    - remove the patch to factor out GD_NEED_PART_SCAN
>>>>
>>>> Yu Kuai (2):
>>>>     block: Revert "block: Do not reread partition table on exclusively
>>>>       open device"
>>>>     block: fix scan partition for exclusively open device again
>>>
>>> Hi Yu kuai,
>>>
>>> Looks the original issue starts to re-appear now with the two patches:
>>>
>>> https://lore.kernel.org/linux-block/20221130135344.2ul4cyfstfs3znxg@quack3/
>>>
>>> And underlying disk partition and raid partition can be observed at the
>>> same time.
>>>
>>> Can you take a look?
>> Yes, thanks for the report. I realize that sda1 adn sdb1 is created
>> while raid open sda and sdb excl, and I think this problem should exist
>> before this patchset.
> 
> Looks not reproduced before applying your two patches, that is exactly what Jan
> tried to fix with 36369f46e917 ("block: Do not reread partition table on exclusively open device").

Hi, Ming

I just tried your test with this patchset reverted, and I can still
reporduce the problem myself.

raid only open this device excl, and disk_scan_partitions is not called:

md_import_device
  blkdev_get_by_devo

I need to add some debuginfo to figure out how GD_NEED_PART_SCAN is set
for sda after raid is stopped. And this should explain why sda1 is
created.

Thanks,
Kuai
> 
> The issue is reported by Changhui's block regression test.
> 
> 
> Thanks,
> Ming
> 
> 
> .
>