linux-ext4 - Re: futher decouple DAX from block devices

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Date:   Fri, 29 Oct 2021 08:42:29 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Christoph Hellwig <hch@....de>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     Mike Snitzer <snitzer@...hat.com>, Ira Weiny <ira.weiny@...el.com>,
        device-mapper development <dm-devel@...hat.com>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-erofs@...ts.ozlabs.org,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org
Subject: Re: futher decouple DAX from block devices

On Thu, Oct 28, 2021 at 4:52 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi Dan,
>
> On Wed, 27 Oct 2021 13:46:31 -0700 Dan Williams <dan.j.williams@...el.com> wrote:
> >
> > My merge resolution is here [1]. Christoph, please have a look. The
> > rebase and the merge result are both passing my test and I'm now going
> > to review the individual patches. However, while I do that and collect
> > acks from DM and EROFS folks, I want to give Stephen a heads up that
> > this is coming. Primarily I want to see if someone sees a better
> > strategy to merge this, please let me know, but if not I plan to walk
> > Stephen and Linus through the resolution.
>
> It doesn't look to bad to me (however it is a bit late in the cycle :-(
> ).  Once you are happy, just put it in your tree (some of the conflicts
> are against the current -rc3 based version of your tree anyway) and I
> will cope with it on Monday.

Christoph, Darrick, Shiyang,

I'm losing my nerve to try to jam this into v5.16 this late in the
cycle. I do want to get dax+reflink squared away as soon as possible,
but that looks like something that needs to build on top of a
v5.16-rc1 at this point. If Linus does a -rc8 then maybe it would have
enough soak time, but otherwise I want to take the time to collect the
acks and queue up some more follow-on cleanups to prepare for
block-less-dax.