Re: [PATCH 1/6] md: switch to ->check_events for media change notifications

From: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	Song Liu <song@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>,
	linux-kernel@vger.kernel.org, linux-xtensa@linux-xtensa.org,
	linux-block@vger.kernel.org, linux-raid@vger.kernel.org,
	linux-mmc@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 1/6] md: switch to ->check_events for media change notifications
Date: Wed, 8 Jul 2020 15:36:40 +0200	[thread overview]
Message-ID: <69412063-07eb-ddd1-2fee-2d3e1258cecf@cloud.ionos.com> (raw)
In-Reply-To: <20200708132338.GO25523@casper.infradead.org>

On 7/8/20 3:23 PM, Matthew Wilcox wrote:
> On Wed, Jul 08, 2020 at 03:17:31PM +0200, Guoqing Jiang wrote:
>> On 7/8/20 2:25 PM, Christoph Hellwig wrote:
>>> -static int md_media_changed(struct gendisk *disk)
>>> -{
>>> -	struct mddev *mddev = disk->private_data;
>>> -
>>> -	return mddev->changed;
>>> -}
>> Maybe we can remove "changed" from struct mddev since no one reads it
>> after the change.
> You missed this hunk:
>
> +static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
>   {
>          struct mddev *mddev = disk->private_data;
> +	unsigned int ret = 0;
>
> +	if (mddev->changed)
> +               ret = DISK_EVENT_MEDIA_CHANGE;
>          mddev->changed = 0;
> -	return 0;
> +	return ret;
>   }
>

Yes, sorry for the noise.

Thanks,
Guoqing