Re: [LSF/MM TOPIC] Future direction of DAX

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On Mon, Jan 16, 2017 at 05:50:33PM -0800, Darrick J. Wong wrote:
> I wouldn't consider it a barrier in general (since ext4 also prints
> EXPERIMENTAL warnings for DAX), merely one for XFS.  I don't even think
> it's that big of a hurdle -- afaict XFS ought to be able to achieve this
> by modifying iomap_begin to allocate new pmem blocks, memcpy the
> contents, and update the memory mappings.  I think.

Yes, and I have a working prototype for that.  I'm just way to busy
with lots of bugfixing at the moment but I plan to get to it in this
merge window.  I also agree that we can't mark a feature as fully
supported until it doesn't conflict with other features.

And I'm not going to get start on the PMEM_IMMUTABLE bullshit, please
don't even go there folks, it's a dead end.

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