linux-kernel - Re: [PATCHSETS] v14 fsdax-rmap + v11 fsdax-reflink

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Date:   Wed, 11 May 2022 11:48:18 +1000
From:   Dave Chinner <david@...morbit.com>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Shiyang Ruan <ruansy.fnst@...itsu.com>,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        nvdimm@...ts.linux.dev, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, dan.j.williams@...el.com,
        hch@...radead.org, jane.chu@...cle.com, rgoldwyn@...e.de,
        viro@...iv.linux.org.uk, willy@...radead.org,
        naoya.horiguchi@....com, linmiaohe@...wei.com
Subject: Re: [PATCHSETS] v14 fsdax-rmap + v11 fsdax-reflink

On Tue, May 10, 2022 at 05:03:52PM -0700, Darrick J. Wong wrote:
> On Sun, May 08, 2022 at 10:36:06PM +0800, Shiyang Ruan wrote:
> > This is a combination of two patchsets:
> >  1.fsdax-rmap: https://lore.kernel.org/linux-xfs/20220419045045.1664996-1-ruansy.fnst@fujitsu.com/
> >  2.fsdax-reflink: https://lore.kernel.org/linux-xfs/20210928062311.4012070-1-ruansy.fnst@fujitsu.com/
> > 
> >  Changes since v13 of fsdax-rmap:
> >   1. Fixed mistakes during rebasing code to latest next-
> >   2. Rebased to next-20220504
> > 
> >  Changes since v10 of fsdax-reflink:
> >   1. Rebased to next-20220504 and fsdax-rmap
> >   2. Dropped a needless cleanup patch: 'fsdax: Convert dax_iomap_zero to
> >       iter model'
> >   3. Fixed many conflicts during rebasing
> >   4. Fixed a dedupe bug in Patch 05: the actuall length to compare could be
> >       shorter than smap->length or dmap->length.
> >   PS: There are many changes during rebasing.  I think it's better to
> >       review again.
> > 
> > ==
> > Shiyang Ruan (14):
> >   fsdax-rmap:
> >     dax: Introduce holder for dax_device
> >     mm: factor helpers for memory_failure_dev_pagemap
> >     pagemap,pmem: Introduce ->memory_failure()
> >     fsdax: Introduce dax_lock_mapping_entry()
> >     mm: Introduce mf_dax_kill_procs() for fsdax case
> 
> Hmm.  This patchset touches at least the dax, pagecache, and xfs
> subsystems.  Assuming it's too late for 5.19, how should we stage this
> for 5.20?

Yeah, it's past my "last date for this merge cycle" which was
-rc6. I expected stuff might slip a little - as it has with the LARP
code - but I don't have the time and bandwidth to start working
on merging another feature from scratch before the merge window
comes around.

Getting the dax+reflink stuff in this cycle was always an optimistic
stretch, but I wanted to try so that there was no doubt it would be
ready for merge in the next cycle...

> I could just add the entire series to iomap-5.20-merge and base the
> xfs-5.20-merge off of that?  But I'm not sure what else might be landing
> in the other subsystems, so I'm open to input.

It'll need to be a stable branch somewhere, but I don't think it
really matters where al long as it's merged into the xfs for-next
tree so it gets filesystem test coverage...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com