Re: [PATCH 0/7] RFC: high-order folio support for I/O

[Kent Overstreet <kent.overstreet@linux.dev>]

On Thu, Jun 15, 2023 at 06:51:35PM +1000, Dave Chinner wrote:
> On Thu, Jun 15, 2023 at 08:21:10AM +0200, Hannes Reinecke wrote:
> > On 6/15/23 01:53, Dave Chinner wrote:
> > > On Wed, Jun 14, 2023 at 05:06:14PM +0200, Hannes Reinecke wrote:
> > > All you need to do now is run the BS > PS filesytems through a full
> > > fstests pass (reflink + rmap enabled, auto group), and then we can
> > > start on the real data integrity validation work. It'll need tens of
> > > billions of fsx ops run on it, days of recoveryloop testing, days of
> > > fstress based exercise, etc before we can actually enable it in
> > > XFS....
> > > 
> > Hey, c'mon. I do know _that_. All I'm saying is that now we can _start_
> > running tests and figure out corner cases (like NFS crashing on me :-).
> > With this patchset we now have some infrastructure in place making it
> > even _possible_ to run those tests.
> 
> I got to this same point several years ago. You know, that patchset
> that Luis went back to when he brought up this whole topic again?
> That's right when I started running fsx, and I realised it
> didn't cover FICLONERANGE, FIDEDUPERANGE and copy_file_range().
> 
> Yep, that's when we first realised we had -zero- test coverage of
> those operations. Darrick and I spent the next *3 months* pretty
> much rewriting the VFS level of those operations and fixing all the
> other bugs in the implementations, just so we could validate they
> worked correct on BS <= PS.

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