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Ben McClelland
062bf0bf47
This change introduces an opt-in O_DIRECT mode for POSIX object data paths while keeping behavior safe and predictable across different filesystems and kernel constraints. We now use direct I/O when available and beneficial, but preserve correctness by falling back to buffered I/O when runtime read behavior indicates alignment or capability mismatches. The implementation keeps fast paths available for full-object reads and descriptor-to-descriptor copy operations so kernel-level optimizations can still be used where possible. At the same time, it avoids global assumptions from single runtime failures and performs fallback at the stream level so requests can continue successfully without broad feature disablement.