linux-kernel - Re: [PATCH 2/2] block: use DAX for partition table reads

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Date:	Fri, 29 Jan 2016 17:45:56 -0500
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-block@...r.kernel.org, linux-nvdimm@...ts.01.org,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	axboe@...com, Jeff Moyer <jmoyer@...hat.com>,
	Jan Kara <jack@...e.com>, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH 2/2] block: use DAX for partition table reads

On Fri, Jan 29, 2016 at 07:18:46AM -0800, Dan Williams wrote:
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 29189aeace19..b1452c04f1a9 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1633,6 +1633,16 @@ struct blk_dax_ctl {
>  	pfn_t pfn;
>  };
>  
> +#ifdef CONFIG_FS_DAX
> +struct page *read_dax_sector(struct block_device *bdev, sector_t n);
> +#else
> +static inline struct page *read_dax_sector(struct block_device *bdev,
> +		sector_t n)
> +{
> +	return ERR_PTR(-ENXIO);
> +}
> +#endif
> +

Can you move this to include/linux/dax.h?  I'd like to keep it that all
functions in dax.c have a prototype in dax.h.

With that change, Reviewed-by: Matthew Wilcox <willy@...ux.intel.com>