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Chris Lu
56c51e7f50
CreateEntry is a FindEntry-then-write with no lock, so concurrent creates to the same path race: OExcl can admit two creators, and a conditional write has no atomic check-then-act. Add a per-path exclusive lock (util.LockTable, which evicts idle keys so it stays bounded) in the CreateEntry handler so the read and the write are atomic on this filer. Once callers route a key's writes to its owner filer, this local lock is the authoritative serialization point. AppendToEntry moves from the distributed lock to the same per-path lock.