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

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Giampaolo Rodola':
> shutil.copyfile() already uses sendfile() which basically provides the same performances. sendfile() should be preferred though because it’s supported since Linux 2.6.33.

Pablo Galindo Salgado:
> But copy_file_rane can leverage more filesystem features like deduplication and copy offload stuff.

We can use copy_file_range() if available, or fallback to sendfile().

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26826>
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