linux-kernel - Re: PROBLEM: BLKPG_DEL_PARTITION with GENHD_FL_NO_PART used to return ENXIO, now returns EINVAL

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Message-ID: <Zagdxacc9ffD7WtW@infradead.org>
Date: Wed, 17 Jan 2024 10:34:45 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Christoph Hellwig <hch@...radead.org>,
	Allison Karlitskaya <allison.karlitskaya@...hat.com>,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: PROBLEM: BLKPG_DEL_PARTITION with GENHD_FL_NO_PART used to
 return ENXIO, now returns EINVAL

On Tue, Jan 16, 2024 at 09:46:21PM +0800, Yu Kuai wrote:
> Please ignore the patch from last email. Sorry for the noise...
> bdev_resize_partition() will also return -ENXIO if partition does't
> exist. So the right patch should be following:

Yes, this looks good.  I've also verified that historically
adding a partition always returned -EINVAL when beyond the maximum
number of partitions (which would have been 0 in this case).