On Tue, Nov 10, 2015 at 04:53:29PM -0500, Anna Schumaker wrote:

Copy system calls came up during Plumbers a while ago, mostly because several
filesystems (including NFS and XFS) are currently working on copy acceleration
implementations.  We haven't heard from Zach Brown in a while, so I volunteered
to push his patches upstream so individual filesystems don't need to keep
writing their own ioctls.

OK, taken for the next cycle.  FWIW, I'm going to toss COMPAT_SYSCALL_DEFINE
counterpart in as well - right now it's doing only native, AFAICS.