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

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Message-ID: <ZBmYcuVzpDDTiaP+@ovpn-8-18.pek2.redhat.com>
Date:   Tue, 21 Mar 2023 19:43:46 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     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,
        yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com,
        ming.lei@...hat.com
Subject: Re: [PATCH -next 0/2] block: fix scan partition for exclusively open
 device again

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?

Follows the script, which isn't 100% triggered, but still easy.

#create level 1 with 2 devices, meta 1.0
mdadm -CR /dev/md0 -l 1 -n 2 /dev/sda /dev/sdb -e 1.0

#create partition 0, start from 0 sector, size 100MiB
sgdisk -n 0:0:+100MiB /dev/md0

#observe partitions
cat /proc/partitions

#stop the array
mdadm -S /dev/md0

#re-assemble 
mdadm -A /dev/md0 /dev/sda /dev/sdb
cat /proc/partitions


Thanks,
Ming