[issue26826] Expose new copy_file_range() syscall in os module.

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

I think data deduplication / CoW / reflink copy is better implemented via FICLONE. "cp --reflink" uses it, I presume because it's older than copy_file_range(). I have a working patch adding CoW copy support for Linux and OSX (but not Windows). I think that should be exposed as a separate shutil.reflink() though, and copyfile() should just do a standard copy.

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<https://bugs.python.org/issue26826>
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