create & open efs.

easy-fs/src/bin/main.rs

@@ -0,0 +1,53 @@
+extern crate easy_fs;
+extern crate alloc;
+
+use easy_fs::{
+    BlockDevice,
+    EasyFileSystem,
+};
+use std::fs::{File, OpenOptions};
+use std::io::{Read, Write, Seek, SeekFrom};
+use std::sync::Mutex;
+use alloc::sync::Arc;
+
+const BLOCK_SZ: usize = 512;
+
+struct BlockFile(Mutex<File>);
+
+impl BlockDevice for BlockFile {
+    fn read_block(&self, block_id: usize, buf: &mut [u8]) {
+        let mut file = self.0.lock().unwrap();
+        file.seek(SeekFrom::Start((block_id * BLOCK_SZ) as u64))
+            .expect("Error when seeking!");
+        assert_eq!(file.read(buf).unwrap(), BLOCK_SZ, "Not a complete block!");
+    }
+
+    fn write_block(&self, block_id: usize, buf: &[u8]) {
+        let mut file = self.0.lock().unwrap();
+        file.seek(SeekFrom::Start((block_id * BLOCK_SZ) as u64))
+            .expect("Error when seeking!");
+        assert_eq!(file.write(buf).unwrap(), BLOCK_SZ, "Not a complete block!");
+    }
+}
+
+fn main() {
+    easy_fs_pack().expect("Error when packing easy-fs!");
+}
+
+fn easy_fs_pack() -> std::io::Result<()> {
+    let block_file = BlockFile(Mutex::new(
+        OpenOptions::new()
+            .read(true)
+            .write(true)
+            .open("target/fs.img")?
+    ));
+    /*
+    let _efs = EasyFileSystem::create(
+        Arc::new(block_file),
+        4096,
+        1,
+    );
+     */
+    let _efs = EasyFileSystem::open(Arc::new(block_file));
+    Ok(())
+}