linux-kernel - Re: [PATCH 1/5] virtio_blk: cleanup zoned device probing

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Date: Mon, 18 Dec 2023 18:35:30 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Stefan Hajnoczi
 <stefanha@...hat.com>, "Martin K. Petersen" <martin.petersen@...cle.com>,
 dm-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
 virtualization@...ts.linux.dev, linux-nvme@...ts.infradead.org,
 linux-scsi@...r.kernel.org, linux-btrfs@...r.kernel.org,
 linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 1/5] virtio_blk: cleanup zoned device probing

On 2023/12/18 1:53, Christoph Hellwig wrote:
> Move reading and checking the zoned model from virtblk_probe_zoned_device
> into the caller, leaving only the code to perform the actual setup for
> host managed zoned devices in virtblk_probe_zoned_device.
> 
> This allows to share the model reading and sharing between builds with
> and without CONFIG_BLK_DEV_ZONED, and improve it for the
> !CONFIG_BLK_DEV_ZONED case.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Looks good.
Reviewed-by: Damien Le Moal <dlemoal@...nel.org>

> ---
>  drivers/block/virtio_blk.c | 50 +++++++++++++++++---------------------
>  1 file changed, 22 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index d53d6aa8ee69a4..aeead732a24dc9 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -748,22 +748,6 @@ static int virtblk_probe_zoned_device(struct virtio_device *vdev,
>  				       struct request_queue *q)
>  {
>  	u32 v, wg;
> -	u8 model;
> -
> -	virtio_cread(vdev, struct virtio_blk_config,
> -		     zoned.model, &model);
> -
> -	switch (model) {
> -	case VIRTIO_BLK_Z_NONE:
> -	case VIRTIO_BLK_Z_HA:
> -		/* Present the host-aware device as non-zoned */
> -		return 0;
> -	case VIRTIO_BLK_Z_HM:
> -		break;
> -	default:
> -		dev_err(&vdev->dev, "unsupported zone model %d\n", model);
> -		return -EINVAL;
> -	}
>  
>  	dev_dbg(&vdev->dev, "probing host-managed zoned device\n");
>  
> @@ -846,16 +830,9 @@ static inline void virtblk_revalidate_zones(struct virtio_blk *vblk)
>  static inline int virtblk_probe_zoned_device(struct virtio_device *vdev,
>  			struct virtio_blk *vblk, struct request_queue *q)
>  {
> -	u8 model;
> -
> -	virtio_cread(vdev, struct virtio_blk_config, zoned.model, &model);
> -	if (model == VIRTIO_BLK_Z_HM) {
> -		dev_err(&vdev->dev,
> -			"virtio_blk: zoned devices are not supported");
> -		return -EOPNOTSUPP;
> -	}
> -
> -	return 0;
> +	dev_err(&vdev->dev,
> +		"virtio_blk: zoned devices are not supported");
> +	return -EOPNOTSUPP;
>  }
>  #endif /* CONFIG_BLK_DEV_ZONED */
>  
> @@ -1570,9 +1547,26 @@ static int virtblk_probe(struct virtio_device *vdev)
>  	 * placed after the virtio_device_ready() call above.
>  	 */
>  	if (virtio_has_feature(vdev, VIRTIO_BLK_F_ZONED)) {
> -		err = virtblk_probe_zoned_device(vdev, vblk, q);
> -		if (err)
> +		u8 model;
> +
> +		virtio_cread(vdev, struct virtio_blk_config, zoned.model,
> +				&model);
> +		switch (model) {
> +		case VIRTIO_BLK_Z_NONE:
> +		case VIRTIO_BLK_Z_HA:
> +			/* Present the host-aware device as non-zoned */
> +			break;
> +		case VIRTIO_BLK_Z_HM:
> +			err = virtblk_probe_zoned_device(vdev, vblk, q);
> +			if (err)
> +				goto out_cleanup_disk;
> +			break;
> +		default:
> +			dev_err(&vdev->dev, "unsupported zone model %d\n",
> +				model);
> +			err = -EINVAL;
>  			goto out_cleanup_disk;
> +		}
>  	}
>  
>  	err = device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups);

-- 
Damien Le Moal
Western Digital Research