Daan De Meyer
5a12005c83
Reflinking is a safe optimization whenever the source and destination are regular, seekable files on a filesystem that supports cloning. Requiring each caller to opt in through COPY_REFLINK adds flag plumbing without changing the necessary fallback behavior. Drop COPY_REFLINK, renumber the remaining flags, and have copy_bytes_full() unconditionally try FICLONE or FICLONERANGE before entering its normal copy loop. Isolate the clone attempt and its file-offset bookkeeping in a helper so copy_bytes_full() only has to handle its cloned, unavailable, and error results. A successful clone therefore completes in one operation, while an unsupported or rejected clone falls back to progress-limited copy_file_range(), sendfile(), or buffered copying. Keep the public reflink helpers for operations that specifically require clone semantics. Existing test-copy coverage exercises both bounded and unbounded regular-file copies through copy_bytes_full(). Signed-off-by: Daan De Meyer <daan@amutable.com>
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