linux-kernel - Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices

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Message-ID: <20150611072812.GB1905@lst.de>
Date:	Thu, 11 Jun 2015 09:28:12 +0200
From:	Christoph Hellwig <hch@....de>
To:	Matthew Wilcox <willy@...ux.intel.com>
Cc:	Christoph Hellwig <hch@....de>,
	Dan Williams <dan.j.williams@...el.com>, axboe@...nel.dk,
	sfr@...b.auug.org.au, rafael@...nel.org, neilb@...e.de,
	gregkh@...uxfoundation.org, linux-nvdimm@...ts.01.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-api@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...nel.org
Subject: Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices

On Wed, Jun 10, 2015 at 02:46:16PM -0400, Matthew Wilcox wrote:
> Don't screw up rw_page.  The point of rw_page is to read or write a page
> cache page.  It can sleep, and it indicates success by using the page
> flags.  Don't try and scqueeze rw_bytes into it.  If you want rw_bytes
> to be a queue operation, that's one thing, but don't mess with rw_page.

Oh, I forgot about the page manipulating nature.  Yes, we'll need a different
operation in this case.
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