Why is it not Sync??

src/block.rs

@@ -0,0 +1,49 @@
+use std::sync::Arc;
+use std::path::PathBuf;
+
+use tokio::fs;
+use tokio::prelude::*;
+
+use crate::error::Error;
+use crate::server::Garage;
+use crate::proto::*;
+use crate::data::*;
+
+fn block_dir(garage: &Garage, hash: &Hash) -> PathBuf {
+	let mut path = garage.system.config.data_dir.clone();
+	path.push(hex::encode(&hash.as_slice()[0..1]));
+	path.push(hex::encode(&hash.as_slice()[1..2]));
+	path
+}
+
+pub async fn write_block(garage: Arc<Garage>, hash: &Hash, data: &[u8]) -> Result<Message, Error> {
+	garage.fs_lock.lock().await;
+
+	let mut path = block_dir(&garage, hash);
+	fs::create_dir_all(&path).await?;
+
+	path.push(hex::encode(hash));
+	if fs::metadata(&path).await.is_ok() {
+		return Ok(Message::Ok)
+	}
+
+	let mut f = fs::File::create(path).await?;
+	f.write_all(data).await?;
+	drop(f);
+
+	Ok(Message::Ok)
+}
+
+pub async fn read_block(garage: Arc<Garage>, hash: &Hash) -> Result<Message, Error> {
+	let mut path = block_dir(&garage, hash);
+	path.push(hex::encode(hash));
+
+	let mut f = fs::File::open(path).await?;
+	let mut data = vec![];
+	f.read_to_end(&mut data).await?;
+
+	Ok(Message::PutBlock(PutBlockMessage{
+		hash: hash.clone(),
+		data,
+	}))
+}