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Date: Sun, 13 Aug 2017 10:08:41 -0700 From: Dan Williams <dan.j.williams@...el.com> To: Christoph Hellwig <hch@...radead.org> Cc: linux-xfs@...r.kernel.org, Jan Kara <jack@...e.cz>, linux-nvdimm <linux-nvdimm@...ts.01.org>, Dave Chinner <david@...morbit.com>, Andy Lutomirski <luto@...nel.org>, Linux FS Devel <linux-fsdevel@...r.kernel.org>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org> Subject: Re: [RFC PATCH 0/7] dax, ext4: Synchronous page faults On Sun, Aug 13, 2017 at 2:25 AM, Christoph Hellwig <hch@...radead.org> wrote: > On Sat, Aug 12, 2017 at 07:44:14PM -0700, Dan Williams wrote: >> How about MAP_SYNC == (MAP_SHARED|MAP_PRIVATE)? On older kernels that >> should get -EINVAL, and on new kernels it means SYNC+SHARED. > > Cute trick, but I'd hate to waster it just for our little flag. > > How about: > > #define __MAP_VALIDATE MAP_SHARED|MAP_PRIVATE > #define MAP_SYNC 0x??? | __MAP_VALIDATE > > so that we can reuse that trick for any new flag? Yes, even better. I think that effectively kicks the need for mmap3() down the road a bit.
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