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d5e5400903
Earlier, the lisafs package allowed programming varying server implementations. However, it assumed that all connections on the same server have the same implementation. In an effort to build custom filesystem gofer implementations, it would be useful to run various implementations on the same server instance. The server synchronizes concurrent RPCs on the same filesystem tree by maintaining the entire filesystem tree in memory and holding server-side locks. We would want to have these concurrency guarantees across different implementations. This change largely refactors all the implementation specificity from Server to Connection. The lisafs wire protocol already encodes the supported message list and the max message size per-mount on MountResp. So no wire protocol changes needed. Hence this is completely backwards compatible and should not lead to any change in behavior. This is a precursor to a follow-up rework of #12950 that drops the multi-Server fan-out and lets LisafsServer choose a per-mount ConnectionImpl that returns the backend ControlFDImpl, all inside the single shared lisafs.Server. Co-authored-by: Shayon Mukherjee <[email protected]> PiperOrigin-RevId: 916313093