linux-kernel - Re: [PATCH 2/4] nvdimm: Add IOCTL pass thru

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Message-ID: <20151110221352.GE47666@tevye.fc.hp.com>
Date:	Tue, 10 Nov 2015 15:13:52 -0700
From:	Jerry Hoemann <jerry.hoemann@....com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	ross.zwisler@...ux.intel.com, rjw@...ysocki.net, lenb@...nel.org,
	dan.j.williams@...el.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvdimm@...1.01.org
Subject: Re: [PATCH 2/4] nvdimm: Add IOCTL pass thru

On Tue, Nov 10, 2015 at 01:05:20PM -0500, Jeff Moyer wrote:
> Jerry Hoemann <jerry.hoemann@....com> writes:
> 
> > Add internal data structure for ndctl_passthru call.
> >
> > Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> > ---
> >  include/linux/libnvdimm.h | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
> > index 3f021dc..01117e1 100644
> > --- a/include/linux/libnvdimm.h
> > +++ b/include/linux/libnvdimm.h
> > @@ -72,6 +72,7 @@ struct nvdimm_bus_descriptor {
> >  	unsigned long dsm_mask;
> >  	char *provider_name;
> >  	ndctl_fn ndctl;
> > +	ndctl_fn ndctl_passthru;
> 
> I don't think this is necessary.  Vector off inside of __nd_ioctl.  That
> especially makes sense if you do switch to passthrough as a command
> instead of a type, but it can work either way.
> 

In an earlier version, I added a "type" argument to ndctl_fn and switched
internally based upon that.  I just came to the conclusion that I'd rather
have two separate acpi_nfit_ctl functions than one trying to do both sets
of argument marshaling.  This is quite different both internally and
to the caller.

So, I thought it would be less confusing to the next engineer, and that
this was a good logical separation point.


-- 

-----------------------------------------------------------------------------
Jerry Hoemann            Software Engineer      Hewlett-Packard Enterprise

3404 E Harmony Rd. MS 36                        phone:  (970) 898-1022
Ft. Collins, CO 80528                           FAX:    (970) 898-0707
                                                email:  jerry.hoemann@....com
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