linux-kernel - Re: dm stripe: add DAX support

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Date:	Wed, 20 Jul 2016 20:01:42 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	axboe@...com, axboe@...nel.dk
Cc:	"Kani, Toshimitsu" <toshi.kani@....com>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"yigal@...xistor.com" <yigal@...xistor.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
	"agk@...hat.com" <agk@...hat.com>
Subject: Re: dm stripe: add DAX support

On Wed, Jul 13 2016 at 11:03am -0400,
Kani, Toshimitsu <toshi.kani@....com> wrote:

> On Tue, 2016-07-12 at 22:01 -0400, Mike Snitzer wrote:
> > On Tue, Jul 12 2016 at  6:22pm -0400,
> > Kani, Toshimitsu <toshi.kani@....com> wrote:
> > > On Fri, 2016-06-24 at 14:29 -0400, Mike Snitzer wrote:
> > > >  
>  :
> > Thanks for putting this summary together.  Unfortunately none of the DM
> > changes can be queued for 4.8 until Jens takes the 2 block core patches:
> > https://patchwork.kernel.org/patch/9196021/
> > https://patchwork.kernel.org/patch/9196019/
> > 
> > Not sure what the hold up and/or issue is with them.  But I've asked
> > twice (and implicilty a 3rd time here).  Hopefully they land in time for
> > 4.8.
> 
> Hi Jens,
> 
> Can you take the two patches above?  These patches add QUEUE_FLAG_DAX and its
> sysfs show func.  They allow device-mapper to set dax-capability based on its
> configuration, and also allow user applications to check dax-capability via
> sysfs.

Hi Jens,

As I shared with you before, here are the 2 patches I staged in
linux-next via linux-dm.git's 'for-next' (same as in the patchwork
references above) -- these were staged just so we had linux-next
coverage until you picked them up.

Please pick these up for 4.8 -- the changes are straightforward, are
required for DM's DAX support, and Dan Williams has also acked them:

https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=for-next&id=6c00531c6affa42b165df73a1eac3289bc45f4c4
https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=for-next&id=51d1a5abcd0e88cb4528f35643245ea59cf234f1

Feel free to pick them up from patchwork or cherry-pick from
linux-dm.git

Thanks!
Mike