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Chris LuandDevin
24b8646ec3
Maintenance mode exists to fence a volume server so it can be evacuated without taking new writes (#7977), but the gate added in #8115 also rejected the RPCs evacuation issues against the source: VolumeMarkReadonly (the first step of every move, and the failure reported in #11066), VolumeDelete (the last step), and VolumeEcShardsDelete (the last step for EC shards). volumeServer.evacuate, volume.move and ec.balance therefore all failed on exactly the server they were meant to drain. Those three RPCs only remove data or restrict the server further, the same class as DeleteCollection and the unmount RPCs that were never gated, so they are exempted from the maintenance check in both the Go and Rust volume servers. Everything that adds data or reopens the server for writes (AllocateVolume, WriteNeedleBlob, BatchDelete, VolumeCopy, ReceiveFile, EC generate/copy/rebuild, vacuum, tiering, VolumeMarkWritable) stays blocked. A side effect is that scrub can now fence broken volumes readonly on a server already in maintenance. Fixes #11066 Generated with [Devin](https://devin.ai) Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>