Add support for an LSM-tree-based backend with Fjall

src/model/Cargo.toml

@@ -44,3 +44,4 @@ default = [ "lmdb", "sqlite" ]
 k2v = [ "garage_util/k2v" ]
 lmdb = [ "garage_db/lmdb" ]
 sqlite = [ "garage_db/sqlite" ]
+fjall = [ "garage_db/fjall" ]

src/model/garage.rs

@@ -124,6 +124,9 @@ impl Garage {
 			db::Engine::Lmdb => {
 				db_path.push("db.lmdb");
 			}
+			db::Engine::Fjall => {
+				db_path.push("db.fjall");
+			}
 		}
 		let db_opt = db::OpenOpt {
 			fsync: config.metadata_fsync,
@@ -131,6 +134,10 @@ impl Garage {
 				v if v == usize::default() => None,
 				v => Some(v),
 			},
+			fjall_block_cache_size: match config.fjall_block_cache_size {
+				v if v == usize::default() => None,
+				v => Some(v),
+			},
 		};
 		let db = db::open_db(&db_path, db_engine, &db_opt)
 			.ok_or_message("Unable to open metadata db")?;