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SubjectRe: [PATCH 1/2] xfs: cache dax_device lookup result
> +	bdev = bt->bt_bdev;
> + if (!blk_queue_dax(bdev->bd_queue))
> + return NULL;
> +
> + if (!bt->bt_daxdev)
> + bt->bt_daxdev = fs_dax_get_by_host(bdev->bd_disk->disk_name);
> +
> + return bt->bt_daxdev;

Please do this at mount time.

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