Re: [PATCH blktests] create a test for direct io offsets

[Keith Busch <kbusch@kernel.org>]

On Tue, Oct 21, 2025 at 09:46:30PM -0700, Christoph Hellwig wrote:
> On Tue, Oct 21, 2025 at 03:22:08PM -0600, Keith Busch wrote:
> > On Mon, Oct 20, 2025 at 10:28:09PM -0700, Christoph Hellwig wrote:
> > > seems like a huge win.  Any chance you could try to get this done ASAP
> > > so that we could make the interface fully discoverable before 6.18 is
> > > released?
> > 
> > I just want to make sure I am aligned to what you have in mind. Is this
> > something like this what you're looking for? This reports the kernel's
> > ability to handle a dio with memory that is discontiguous for a single
> > device "sector", and reports the virtual gap requirements.
> 
> So, I think Christian really did not want more random stuff in statx,
> which would lead to using fsxattr instead.

I haven't forgotten about this. I was hoping I would make sense of the
request. It looks like only xfs makes use of fsxattr (it's the only one
that calls copy_fsxattr_to_user()). Is the intention that every
filesystem needs to implement support for fsxattr then?