linux-kernel - Re: Question about the "EXPERIMENTAL" tag for dax in XFS

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Message-ID: <20210226190454.GD7272@magnolia>
Date:   Fri, 26 Feb 2021 11:04:54 -0800
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     "ruansy.fnst@...itsu.com" <ruansy.fnst@...itsu.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "darrick.wong@...cle.com" <darrick.wong@...cle.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "jack@...e.cz" <jack@...e.cz>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>,
        "david@...morbit.com" <david@...morbit.com>,
        "hch@....de" <hch@....de>, "rgoldwyn@...e.de" <rgoldwyn@...e.de>,
        "y-goto@...itsu.com" <y-goto@...itsu.com>,
        "qi.fuli@...itsu.com" <qi.fuli@...itsu.com>,
        "fnstml-iaas@...fujitsu.com" <fnstml-iaas@...fujitsu.com>
Subject: Re: Question about the "EXPERIMENTAL" tag for dax in XFS

On Fri, Feb 26, 2021 at 09:45:45AM +0000, ruansy.fnst@...itsu.com wrote:
> Hi, guys
> 
> Beside this patchset, I'd like to confirm something about the
> "EXPERIMENTAL" tag for dax in XFS.
> 
> In XFS, the "EXPERIMENTAL" tag, which is reported in waring message
> when we mount a pmem device with dax option, has been existed for a
> while.  It's a bit annoying when using fsdax feature.  So, my initial
> intention was to remove this tag.  And I started to find out and solve
> the problems which prevent it from being removed.
> 
> As is talked before, there are 3 main problems.  The first one is "dax
> semantics", which has been resolved.  The rest two are "RMAP for
> fsdax" and "support dax reflink for filesystem", which I have been
> working on.  

<nod>

> So, what I want to confirm is: does it means that we can remove the
> "EXPERIMENTAL" tag when the rest two problem are solved?

Yes.  I'd keep the experimental tag for a cycle or two to make sure that
nothing new pops up, but otherwise the two patchsets you've sent close
those two big remaining gaps.  Thank you for working on this!

> Or maybe there are other important problems need to be fixed before
> removing it?  If there are, could you please show me that?

That remains to be seen through QA/validation, but I think that's it.

Granted, I still have to read through the two patchsets...

--D

> 
> Thank you.
> 
> 
> --
> Ruan Shiyang.