On Thu, 25 Sep 2014 16:33:17 -0400, Matthew Wilcox said: > Patch 19 adds some DAX infrastructure to support ext4. > > Patch 20 adds DAX support to ext4. It is broadly similar to ext2's DAX > support, but it is more efficient than ext4's due to its support for > unwritten extents. I don't currently have a use case for NV-DIMM support. However, it would be nice if this code could be leveraged to support 'force O_DIRECT on all I/O to this file' - that I *do* have a use case for. Patch 20 looks to my untrained eye like it *almost* gets there. (And if in fact it *does* do the whole enchilada, the Changelog etc should mention it :)
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