Re: How can we share page cache pages for reflinked files?

[Christoph Hellwig <hch@infradead.org>]

On Fri, Aug 11, 2017 at 10:08:47AM -0700, Matthew Wilcox wrote:
> Assuming there's something fun we can do with filesystems that's
> interesting to this type of user, what do you think to this:
> 
> Create a block device (maybe it's a loop device, maybe it's dm-raid0)
> which supports DAX and uses the page cache to cache the physical pages
> of the block device it's fronting.

Why not make every block device just support fake DAX and avoid the
additional layer?

Basically this would be going back to a file cache indexed by
physical blocks from our logically indexed page cache model.  And
for a fs using heavy reflinks that's probably the right model in the
end.

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