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

[Darrick J. Wong]

On Tue, May 10, 2022 at 07:28:53PM -0700, Andrew Morton wrote:
> On Tue, 10 May 2022 18:55:50 -0700 Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
> 
> > > 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...
> > 
> > So how about let the notify_failure() bits go through -mm this cycle,
> > if Andrew will have it, and then the reflnk work has a clean v5.19-rc1
> > baseline to build from?
> 
> What are we referring to here?  I think a minimal thing would be the
> memremap.h and memory-failure.c changes from
> https://lkml.kernel.org/r/20220508143620.1775214-4-ruansy.fnst@xxxxxxxxxxx ?
> 
> Sure, I can scoot that into 5.19-rc1 if you think that's best.  It
> would probably be straining things to slip it into 5.19.
> 
> The use of EOPNOTSUPP is a bit suspect, btw.  It *sounds* like the
> right thing, but it's a networking errno.  I suppose livable with if it
> never escapes the kernel, but if it can get back to userspace then a
> user would be justified in wondering how the heck a filesystem
> operation generated a networking errno?

<shrug> most filesystems return EOPNOTSUPP rather enthusiastically when
they don't know how to do something...

--D