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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>