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* master: extract the periodic per-layout grow decision Move the must-grow and crowded-step decision of the periodic growth scan in ProcessGrowRequest into periodicGrowCount, a pure function of the layout's lastGrowCount, writable and crowded counts, so it can be tested without running the scan loop or growing real volumes. No behavior change. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * master: record writableVolumeCount on HTTP /dir/assign The periodic growth scan (#5781) keeps a layout supplied ahead of demand only when it knows how many writable volumes clients want: lastGrowCount, which gRPC Assign records with SetLastGrowCount. HTTP /dir/assign parsed writableVolumeCount but only used it to size the emergency grow when no writable volume was left, so the scan always saw lastGrowCount 0 for HTTP-only writers. Since #5821 removed the per-assign threshold grow, such a layout only grew by the rack-aware step of 2, and only once every writable volume was crowded. When a batch of volumes filled in lockstep, those 2 took every write and could fill before the next scan, leaving no writable volumes until an assign-triggered emergency grow landed, with 503s for every other assign meanwhile. Record writableVolumeCount on HTTP assigns as gRPC Assign does. Clients that do not send it are unaffected. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * master: reject unknown rack/dataNode before recording grow targets An assign naming a rack or data node outside the topology can never be served, but lastGrowCount was recorded first. The periodic growth scan drops the requested placement, so it kept topping the layout up with volumes the requester could not use. Both assign paths now validate the placement like they already validate the data center. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * master: scope placement existence checks to the requested path A rack in another data center or a data node under another rack passed validation yet could never serve the request, and the grow count was still recorded. The rack and data-node lookups now take the requested parents, matching the filters the placement engine applies. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com> Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>