Re: [PATCH 3/3] nbd: Use invalidate_gendisk() helper on disconnect

[Christoph Hellwig <hch@infradead.org>]

On Mon, Sep 13, 2021 at 07:25:57PM +0800, Xie Yongji wrote:
> +		invalidate_gendisk(nbd->disk);
> +		if (nbd->config->bytesize)
> +			kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);

I wonder if the invalidate helper should just use
set_capacity_and_notify to take care of the notification in the proper
way.  This adds an uevent to loop, and adds the RESIZE=1 argument to
nbd, but it feels like the right thing to do.