Re: [RFC PATCH 0/7] dax, ext4: Synchronous page faults
From: Christoph Hellwig <hch@infradead.org>
Date: 2017-08-13 09:25:59
Also in:
linux-fsdevel, linux-xfs, nvdimm
Possibly related (same subject, not in this thread)
- 2017-08-01 · Re: [RFC PATCH 0/7] dax, ext4: Synchronous page faults · Christoph Hellwig <hch@infradead.org>
- 2017-07-27 · [RFC PATCH 0/7] dax, ext4: Synchronous page faults · Jan Kara <jack@suse.cz>
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?