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Chris Lu
b063095cb4
create-then-delete is unsafe for the filer sink: CreateEntry returns nil without creating on a transient chunk-copy error, so the paired delete could remove the only valid destination copy; a directory rename also deleted the old subtree before descendants were recreated, and left old chunks behind. Add an optional EntryMover sink capability and implement it on the filer sink via AtomicRenameEntry — one atomic, metadata-only move that relocates a whole subtree in a single transaction. Renames prefer it; sinks without a native move keep create-then-delete. When the old path is already gone (a descendant the parent rename moved, or one never replicated) MoveEntry creates the new path instead, re-checking existence with a lookup so a rolled-back move that left the old entry intact is retried rather than mistaken for gone.