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

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Message-ID: <ZC95kzpiZnD9m7GY@ovpn-8-24.pek2.redhat.com>
Date:   Fri, 7 Apr 2023 10:01:55 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Yu Kuai <yukuai1@...weicloud.com>, jack@...e.cz, hch@...radead.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>, ming.lei@...hat.com
Subject: Re: [PATCH] block: don't set GD_NEED_PART_SCAN if scan partition
 failed

On Thu, Apr 06, 2023 at 04:29:43PM -0600, Jens Axboe wrote:
> 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...

This patch is bug fix, and probably should aim at 6.3.

Thanks,
Ming