linux-kernel - Re: [PATCH 5/6] block: dasd_genhd: convert to blkdev_reread

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Message-ID: <20150406134655.GE14217@redhat.com>
Date:	Mon, 6 Apr 2015 09:46:55 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	David Herrmann <dh.herrmann@...il.com>,
	Markus Pargmann <mpa@...gutronix.de>,
	nbd-general@...ts.sourceforge.net,
	Stefan Haberland <stefan.haberland@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Fabian Frederick <fabf@...net.be>, linux-s390@...r.kernel.org
Subject: Re: [PATCH 5/6] block: dasd_genhd: convert to blkdev_reread_part

On Sun, Apr 05, 2015 at 03:24:47PM +0800, Ming Lei wrote:
> Also remove the obsolete comment.
> 
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
>  drivers/s390/block/dasd_genhd.c |    9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
> index 90f39f7..2af4619 100644
> --- a/drivers/s390/block/dasd_genhd.c
> +++ b/drivers/s390/block/dasd_genhd.c
> @@ -116,14 +116,11 @@ int dasd_scan_partitions(struct dasd_block *block)
>  			      rc);
>  		return -ENODEV;
>  	}
> -	/*
> -	 * See fs/partition/check.c:register_disk,rescan_partitions
> -	 * Can't call rescan_partitions directly. Use ioctl.
> -	 */
> -	rc = ioctl_by_bdev(bdev, BLKRRPART, 0);
> +
> +	rc = blkdev_reread_part(bdev);
>  	while (rc == -EBUSY && retry > 0) {
>  		schedule();
> -		rc = ioctl_by_bdev(bdev, BLKRRPART, 0);
> +		rc = blkdev_reread_part(bdev);
>  		retry--;
>  		DBF_DEV_EVENT(DBF_ERR, block->base,
>  			      "scan partitions error, retry %d rc %d",

Note: patch 6/6 in the series makes this whole while() loops pointless,
since the possibility of the -EBUSY return goes away.

-- 
Jarod Wilson
jarod@...hat.com

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