add separate PreCache step for GcReferenceChecker (#578)

- Improvement: GCv2: Use separate PreCache step to improve concurrency when checking references
- Improvement: GCv2: Improved verbose logging
- Improvement: GCv2: Sort chunks to read by block/offset when finding references
- Improvement: GCv2: Exit as soon as no more unreferenced items are left

1 files changed, 11 insertions, 0 deletions

diff --git a/src/zenstore/blockstore.cpp b/src/zenstore/blockstore.cpp
index 03c7f4b95..cc727787f 100644
--- a/src/zenstore/blockstore.cpp
+++ b/src/zenstore/blockstore.cpp
@@ -1274,6 +1274,17 @@ BlockStore::GetBlockPath(const std::filesystem::path& BlocksBasePath, const uint
 	return Path.ToPath();
 }
 
+Ref<BlockStoreFile>
+BlockStore::GetBlockFile(uint32_t BlockIndex)
+{
+	RwLock::SharedLockScope _(m_InsertLock);
+	if (auto It = m_ChunkBlocks.find(BlockIndex); It != m_ChunkBlocks.end())
+	{
+		return It->second;
+	}
+	return {};
+}
+
 #if ZEN_WITH_TESTS
 
 TEST_CASE("blockstore.blockstoredisklocation")