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* cache resolved chunk manifests for Mount * Address PR review: per-mount cache, singleflight, reuse ResolveOneChunkManifest - Own the manifest cache per WFS mount instead of a process-global variable, so manifests from one filer backend are never served to another (Devin/CodeRabbit major bug). - Coalesce concurrent cold misses via singleflight so only one fetch runs during a cold burst (Greptile P2). - Copy cached data after releasing the mutex so a large copy does not block concurrent hits, inserts, and evictions (CodeRabbit nitpick). - Reuse the existing ResolveOneChunkManifest function name instead of introducing a new resolveOneChunkManifest wrapper. - Validate (unmarshal) manifest bytes before caching so malformed manifests do not poison the cache. - Add TestChunkGroupManifestResolutionCoalescesColdMisses covering the singleflight cold-miss path. * Address round 2 review: coalesced-miss cancellation, test overlap - Use singleflight.DoChan in fetchOrLoad and select on ctx.Done() so a caller whose context is canceled while waiting for an in-flight fetch returns ctx.Err() promptly instead of blocking for the leader's result (Devin BUG). - Add TestResolveOneChunkManifestCanceledWaiterReturnsDuringCoalescedMiss covering the canceled-waiter path. - Delay the cold-miss fixture response so the leader's fetch is still in flight when concurrent opens join the singleflight, making the one-fetch assertions reliable (CodeRabbit Minor). * Address review: keep ResolveOneChunkManifest four-argument Restore the exported ResolveOneChunkManifest to its original four-argument signature so external callers keep compiling. Move the cache-aware resolution into an unexported resolveOneChunkManifest helper that accepts the per-mount ChunkManifestCache. The exported function delegates to the helper with a nil cache, preserving the historical uncached behavior for every non-Mount caller. The Mount path (ChunkGroup.SetChunks) now calls the unexported helper with the mount-owned cache. Tests and benchmarks that exercise the cache path call the unexported helper directly. --------- Co-authored-by: Chris Lu <chris.lu@gmail.com> Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>