On Fri, Aug 25, 2017 at 12:54:15AM -0700, Christoph Hellwig wrote: > > 1) Has there been any other difficulty that XFS has had due to the > > fact that they have this DAX flag added? e.g., are there any > > operational, or practical code maintainability issues at stake here? > > Or is this mostly an design philosophy debate? > > It hasn't yet. It will create really annoying problems once we > use raw DAX access for metadata, which I had prototype a while ago > and plan to finnally get in in the next months. > > > 2) Are there any users using the DAX flag with XFS such that, if XFS > > were to remove the DAX flag support, those users would complain > > bitterly? > > I don't know of anyone that actually uses the flag. If someone did > that would probably run into problems like changing that changing it > on a file that's currently mmaped would crash an burn badly. Crash and burn meaning the *kernel* will crash and burn? Or will data be damaged? Given that, maybe XFS should withdraw support for the DAX and hope no one is actually using it? - Ted
