block manager: skeleton for multi-hdd support

src/block/layout.rs

@@ -0,0 +1,57 @@
+use std::path::PathBuf;
+
+use serde::{Deserialize, Serialize};
+
+use garage_util::config::DataDirEnum;
+use garage_util::data::Hash;
+use garage_util::migrate::*;
+
+pub const DRIVE_NPART: usize = 1024;
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub(crate) struct DataLayout {
+	pub(crate) data_dirs: Vec<DataDir>,
+	pub(crate) partitions: Vec<Partition>,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub(crate) struct DataDir {
+	pub(crate) path: PathBuf,
+	pub(crate) state: DataDirState,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub(crate) enum DataDirState {
+	Active { capacity: u64 },
+	ReadOnly,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub(crate) struct Partition {
+	pub(crate) prim: usize,
+	pub(crate) sec: Vec<usize>,
+}
+
+impl DataLayout {
+	pub(crate) fn initialize(dirs: &DataDirEnum) -> Self {
+		todo!()
+	}
+
+	pub(crate) fn update(&mut self, dirs: &DataDirEnum) -> Self {
+		todo!()
+	}
+
+	pub(crate) fn data_dir(&self, hash: &Hash) -> PathBuf {
+		todo!()
+		/*
+		let mut path = self.data_dir.clone();
+		path.push(hex::encode(&hash.as_slice()[0..1]));
+		path.push(hex::encode(&hash.as_slice()[1..2]));
+		path
+		*/
+	}
+}
+
+impl InitialFormat for DataLayout {
+	const VERSION_MARKER: &'static [u8] = b"G09bmdl";
+}