Messages in this thread |  | | Date | Sun, 9 Oct 2016 08:17:48 -0700 | From | Christoph Hellwig <> | Subject | Re: [RFC PATCH-tip v4 02/10] locking/rwsem: Stop active read lock ASAP |
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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..
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