linux-kernel - Re: [PATCH] block: don't set GD_NEED_PART

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Message-ID: <b3817e92-80ca-8eea-ebdd-f2172f3390c8@kernel.dk>
Date:   Thu, 6 Apr 2023 16:29:43 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Yu Kuai <yukuai1@...weicloud.com>, ming.lei@...hat.com,
        jack@...e.cz, hch@...radead.org
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] block: don't set GD_NEED_PART_SCAN if scan partition
 failed

On 4/5/23 9:42 PM, Yu Kuai wrote:
> Hi, Jens!
> 
> 在 2023/03/22 11:59, Yu Kuai 写道:
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> Currently if disk_scan_partitions() failed, GD_NEED_PART_SCAN will still
>> set, and partition scan will be proceed again when blkdev_get_by_dev()
>> is called. However, this will cause a problem that re-assemble partitioned
>> raid device will creat partition for underlying disk.
>>
>> Test procedure:
>>
>> mdadm -CR /dev/md0 -l 1 -n 2 /dev/sda /dev/sdb -e 1.0
>> sgdisk -n 0:0:+100MiB /dev/md0
>> blockdev --rereadpt /dev/sda
>> blockdev --rereadpt /dev/sdb
>> mdadm -S /dev/md0
>> mdadm -A /dev/md0 /dev/sda /dev/sdb
>>
>> Test result: underlying disk partition and raid partition can be
>> observed at the same time
>>
>> Note that this can still happen in come corner cases that
>> GD_NEED_PART_SCAN can be set for underlying disk while re-assemble raid
>> device.
>>
> 
> Can you apply this patch?

None of them apply to my for-6.4/block branch...

-- 
Jens Axboe