On 12:20 14/02, Dan Williams wrote:
On Thu, Feb 14, 2019 at 12:09 PM Matthew Wilcox
> On Thu, Feb 14, 2019 at 11:31:24AM -0800, Dan Williams wrote:
> > On Thu, Feb 14, 2019 at 11:10 AM Jerome Glisse <jglisse(a)redhat.com>
> > > I am just again working on my struct page mapping patchset as well as
> > > the generic page write protection that sits on top. I hope to be able
> > > to post the v2 in couple weeks. You can always look at my posting last
> > > year to see more details.
> > Yes, I have that in mind as one of the contenders. However, it's not
> > clear to me that its a suitable fit for filesystem-reflink. Others
> > have floated the 'page proxy' idea, so it would be good to discuss the
> > merits of the general approaches.
> ... and my preferred option of putting pfn entries in the page cache.
Another option to include the discussion.
> Or is that what you meant by "page proxy"?
Page proxy would be an object that a filesystem could allocate to
point back to a single physical 'struct page *'. The proxy would
contain an override for page->index.
Was there any outcome on this and its implementation? I am specifically
interested in this for DAX support on btrfs/CoW: The TODO comment on
top of dax_associate_entry() :)
If there are patches/git tree I could use to base my patches on, it would