[PATCHSET] support FSCTL_DUPLICATE_EXTENTS_TO_FILE

[Björn Jacke]

On 2017-05-11 at 00:25 -0700 Christoph Hellwig sent off:
> As I haven't seen any follow up here:  Can we please move the
> IOC_CLONE_RANGE support out of the btrfs module as it's a general Linux
> API, and can't just be replace with copy_file_range?

from what I can tell copy_file_range? does what we need, doesn't it? And it has
support for several filesystems already while IOC_CLONE_RANGE might only be
supported for more filesystems in the future (maybe). David: I can send updated
patch the next days unless we say for some reason that copy_file_range isn't
the way we want to go anyway.

Björn
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