Chris Lu c31e6b4684 Use filer-side copy for mounted whole-file copy_file_range (#8747) ...

* Optimize mounted whole-file copy_file_range

* Address mounted copy review feedback

* Harden mounted copy fast path

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Co-authored-by: Copilot <copilot@github.com>

2026-03-23 18:35:15 -07:00

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