On Tue, Sep 30, 2014 at 05:45:01AM -0400, Valdis.Kletnieks@xxxxxx wrote: > 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 :) No, it doesn't try to do that. Wouldn't you be better served with an LD_PRELOAD that forces O_DIRECT on? -- 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>