1 files changed, 77 insertions, 0 deletions
diff --git a/src/model/s3/block_ref_table.rs b/src/model/s3/block_ref_table.rs
new file mode 100644
index 00000000..c7017409
--- /dev/null
+++ b/src/model/s3/block_ref_table.rs
@@ -0,0 +1,77 @@
+use serde::{Deserialize, Serialize};
+use std::sync::Arc;
+
+use garage_db as db;
+
+use garage_util::data::*;
+
+use garage_table::crdt::Crdt;
+use garage_table::*;
+
+use garage_block::manager::*;
+
+#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+pub struct BlockRef {
+	/// Hash (blake2 sum) of the block, used as partition key
+	pub block: Hash,
+
+	/// Id of the Version for the object containing this block, used as sorting key
+	pub version: Uuid,
+
+	// Keep track of deleted status
+	/// Is the Version that contains this block deleted
+	pub deleted: crdt::Bool,
+}
+
+impl Entry<Hash, Uuid> for BlockRef {
+	fn partition_key(&self) -> &Hash {
+		&self.block
+	}
+	fn sort_key(&self) -> &Uuid {
+		&self.version
+	}
+	fn is_tombstone(&self) -> bool {
+		self.deleted.get()
+	}
+}
+
+impl Crdt for BlockRef {
+	fn merge(&mut self, other: &Self) {
+		self.deleted.merge(&other.deleted);
+	}
+}
+
+pub struct BlockRefTable {
+	pub block_manager: Arc<BlockManager>,
+}
+
+impl TableSchema for BlockRefTable {
+	const TABLE_NAME: &'static str = "block_ref";
+
+	type P = Hash;
+	type S = Uuid;
+	type E = BlockRef;
+	type Filter = DeletedFilter;
+
+	fn updated(
+		&self,
+		tx: &mut db::Transaction,
+		old: Option<&Self::E>,
+		new: Option<&Self::E>,
+	) -> db::TxOpResult<()> {
+		let block = old.or(new).unwrap().block;
+		let was_before = old.map(|x| !x.deleted.get()).unwrap_or(false);
+		let is_after = new.map(|x| !x.deleted.get()).unwrap_or(false);
+		if is_after && !was_before {
+			self.block_manager.block_incref(tx, block)?;
+		}
+		if was_before && !is_after {
+			self.block_manager.block_decref(tx, block)?;
+		}
+		Ok(())
+	}
+
+	fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
+		filter.apply(entry.deleted.get())
+	}
+}