linux-kernel - Re: [PATCH v6 01/26] fuse: Fix dax truncate/punch

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Message-ID: <CADSE00KUeTp_C_kZPS1U2JcLiWuN1s6Se72gtFiN71kXCZx4UA@mail.gmail.com>
Date: Fri, 7 Feb 2025 17:16:09 +0100
From: Albert Esteve <aesteve@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: Stefan Hajnoczi <stefanha@...hat.com>, Vivek Goyal <vgoyal@...hat.com>, 
	Dan Williams <dan.j.williams@...el.com>, Alistair Popple <apopple@...dia.com>, akpm@...ux-foundation.org, 
	linux-mm@...ck.org, alison.schofield@...el.com, lina@...hilina.net, 
	zhang.lyra@...il.com, gerald.schaefer@...ux.ibm.com, vishal.l.verma@...el.com, 
	dave.jiang@...el.com, logang@...tatee.com, bhelgaas@...gle.com, jack@...e.cz, 
	jgg@...pe.ca, catalin.marinas@....com, will@...nel.org, mpe@...erman.id.au, 
	npiggin@...il.com, dave.hansen@...ux.intel.com, ira.weiny@...el.com, 
	willy@...radead.org, djwong@...nel.org, tytso@....edu, linmiaohe@...wei.com, 
	peterx@...hat.com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
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	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, 
	linux-xfs@...r.kernel.org, jhubbard@...dia.com, hch@....de, 
	david@...morbit.com, chenhuacai@...nel.org, kernel@...0n.name, 
	loongarch@...ts.linux.dev, Hanna Czenczek <hreitz@...hat.com>, 
	German Maglione <gmaglione@...hat.com>
Subject: Re: [PATCH v6 01/26] fuse: Fix dax truncate/punch_hole fault path

On Thu, Feb 6, 2025 at 7:22 PM David Hildenbrand <david@...hat.com> wrote:
>
> On 06.02.25 15:59, Albert Esteve wrote:
> > Hi!
> >
> > On Thu, Feb 6, 2025 at 3:30 PM Stefan Hajnoczi <stefanha@...hat.com> wrote:
> >>
> >> On Thu, Feb 06, 2025 at 08:37:07AM -0500, Vivek Goyal wrote:
> >>> And then there are challenges at QEMU level. virtiofsd needs additional
> >>> vhost-user commands to implement DAX and these never went upstream in
> >>> QEMU. I hope these challenges are sorted at some point of time.
> >>
> >> Albert Esteve has been working on QEMU support:
> >> https://lore.kernel.org/qemu-devel/20240912145335.129447-1-aesteve@redhat.com/
> >>
> >> He has a viable solution. I think the remaining issue is how to best
> >> structure the memory regions. The reason for slow progress is not
> >> because it can't be done, it's probably just because this is a
> >> background task.
> >
> > It is partially that, indeed. But what has me blocked for now on posting the
> > next version is that I was reworking a bit the MMAP strategy.
> > Following David comments, I am relying more on RAMBlocks and
> > subregions for mmaps. But this turned out more difficult than anticipated.
>
> Yeah, if that turns out to be too painful, we could start with the
> previous approach and work on that later. I also did not expect that to
> become that complicated.

Thanks. I'd like to do it properly, so I think will try a bit more to get it
to work. Maybe another week. If I do not manage, I may do
what you suggested (I'll align with you first) to move the patch forward.

That said, if I end up doing that, I will definitively revisit it later.

BR,
Albert.

>
> --
> Cheers,
>
> David / dhildenb
>