linux-kernel - Re: [PATCH 1/2] xfs: cache dax

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Date:   Fri, 25 Aug 2017 09:01:04 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvdimm@...ts.01.org, jack@...e.cz, hch@....de,
        "Darrick J. Wong" <darrick.wong@...cle.com>
Subject: Re: [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.