On Sun, Oct 09, 2016 at 08:17:48AM -0700, Christoph Hellwig wrote: > On Fri, Oct 07, 2016 at 08:47:51AM +1100, Dave Chinner wrote: > > Except that it's DAX, and in 4.7-rc1 that used shared locking at the > > XFS level and never took exclusive locks. > > > > *However*, the DAX IO path locking in XFS has changed in 4.9-rc1 to > > match the buffered IO single writer POSIX semantics - the test is a > > bad test based on the fact it exercised a path that is under heavy > > development and so can't be used as a regression test across > > multiple kernels. > > That being said - I wonder if we should allow the shared lock on DAX > files IFF the user is specifying O_DIRECT in the open mode.. It should do - if it doesn't then we screwed up the IO path selection logic in XFS and we'll need to fix it. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
