linux-kernel - Re: [PATCH v2 1/3] block: add QUEUE_FLAG_DAX for devices to advertise their DAX support

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Date:	Thu, 23 Jun 2016 17:11:32 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	"Kani, Toshimitsu" <toshi.kani@....com>
Cc:	"yigal@...xistor.com" <yigal@...xistor.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>,
	"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"agk@...hat.com" <agk@...hat.com>
Subject: Re: [PATCH v2 1/3] block: add QUEUE_FLAG_DAX for devices to
 advertise their DAX support

On Thu, Jun 23 2016 at  1:36pm -0400,
Kani, Toshimitsu <toshi.kani@....com> wrote:

> On Thu, 2016-06-23 at 19:31 +0300, Yigal Korman wrote:
> > On Thu, Jun 23, 2016 at 2:54 AM, Toshi Kani <toshi.kani@....com> wrote:
> > > 
> > > 
> > > Currently, presence of direct_access() in block_device_operations
> > > indicates support of DAX on its block device.  Because
> > > block_device_operations is instantiated with 'const', this DAX
> > > capablity may not be enabled conditinally.
> > > 
> > > In preparation for supporting DAX to device-mapper devices, add
> > > QUEUE_FLAG_DAX to request_queue flags to advertise their DAX
> > > support.  This will allow to set the DAX capability based on how
> > > mapped device is composed.
> > 
> > Hi Toshi,
> > This patch is very helpful!
> > I think QUEUE_FLAG_DAX can also help with identifying dax devices in
> > userspace.
> > Perhaps you'd be willing to squash the patch below with this one or
> > add it to your submission?
> 
> Hi Yigal,
> 
> Good idea.  Mike can probably take it into his tree, but I will include it
> into the series if I needed to submit v3.
> 
> Acked-by: Toshi Kani <toshi.kani@....com>

As you can see I sent out v3 of this set.  Jens will need to pick up the
"block:" patches but I'll pick up the DM patches once Jens does so.