linux-kernel - Re: [Linux-nvdimm] [PATCH 19/21] nd: infrastructure for btt devices

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Message-ID: <20150428154227.GC4003@linux.intel.com>
Date:	Tue, 28 Apr 2015 11:42:27 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Neil Brown <neilb@...e.de>, linux-nvdimm@...1.01.org,
	linux-kernel@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [Linux-nvdimm] [PATCH 19/21] nd: infrastructure for btt devices

On Tue, Apr 28, 2015 at 06:01:04AM -0700, Christoph Hellwig wrote:
> Please don't add any of the nd-specific hacks into the pmem driver.
> The rw_bytes functionality already is provided by the existing block
> level ->rw_page method which pmem already implements, and any sort
> of bus locking for different access methods should be in the bus
> glue, not in pmem.c

->rw_page only lets you do an entire page, not a range of bytes within
a page.
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