linux-kernel - Re: [PATCH 0/6] Support DAX for device-mapper dm-linear devices

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Date:	Tue, 14 Jun 2016 15:53:23 +0000
From:	"Kani, Toshimitsu" <toshi.kani@....com>
To:	"jmoyer@...hat.com" <jmoyer@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
	"agk@...hat.com" <agk@...hat.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"snitzer@...hat.com" <snitzer@...hat.com>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>
Subject: Re: [PATCH 0/6] Support DAX for device-mapper dm-linear devices

On Tue, 2016-06-14 at 09:50 -0400, Jeff Moyer wrote:
> "Kani, Toshimitsu" <toshi.kani@....com> writes:
> > > I had dm-linear and md-raid0 support on my list of things to look at,
> > > did you have raid0 in your plans?
> >
> > Yes, I hope to extend further and raid0 is a good candidate. 
>
> dm-flakey would allow more xfstests test cases to run.  I'd say that's
> more important than linear or raid0.  ;-)

That's an interesting one.  We can emulate badblocks by failing
direct_access with -EIO, but I do not think we can emulate "drop_writes" and
"corrupt_bio_byte" features with DAX...

> Also, the next step in this work is to then decide how to determine on
> what numa node an LBA resides.  We had discussed this at a prior
> plumbers conference, and I think the consensus was to use xattrs.
> Toshi, do you also plan to do that work?

No, it's not my plan at this point.

Thanks,
-Toshi