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…g metadata
BlockKey stays pure {id, index, size} for Filename/StoreKey/LRU hash.
BlockContext wraps BlockKey + fs_id for cache layer routing (StorageClientPool).
BlockCache interface now takes BlockContext instead of BlockKey.
…s isolation
Add PrefixBlockAccesser decorator that wraps BlockAccesserImpl and
transparently prepends {fs_name}/ prefix to all object keys, enabling
multiple filesystems to share a single S3 bucket with isolated namespaces.
- New header-only PrefixBlockAccesser in prefix_block_accesser.h
- Client (vfs_hub.cc): use NewPrefixBlockAccesser with fs_info_.name
- CacheNode (storage_client_pool.cc): use NewPrefixBlockAccesser with fs_info.fs_name()
- MDS GC (gc.cc): use NewSharePrefixBlockAccesser with fs_info.fs_name()
- BR (br.cc): unchanged, operates on backup metadata not block data
…e layer Replace old 5-field BlockKey(fs_id, ino, id, index, version) with new 3-field BlockKey(id, index, size) + BlockContext(BlockKey + fs_id) across the entire cache layer. Key changes: - Proto: Add BlockContext message wrapping BlockKey + fs_id - CacheStore: Unified interface with BlockContext - Stage directory: Isolated by fs_id subdirectory (inspired by JuiceFS) - New block_key_helper.h: ParseFromFilename / ToPB / FromPB - Client layer: Adapt BlockStore and prefetch/warmup to use BlockContext with proper fs_id propagation Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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