fix(driver,fs): symlink direct wrong

Author: Berrysoft

compio-driver/src/iour/op.rs

@@ -233,8 +233,8 @@ impl OpCode for Symlink {
     fn create_entry(self: Pin<&mut Self>) -> OpEntry {
         opcode::SymlinkAt::new(
             Fd(libc::AT_FDCWD),
-            self.target.as_ptr(),
             self.source.as_ptr(),
+            self.target.as_ptr(),
         )
         .build()
         .into()

compio-driver/src/poll/op.rs

@@ -331,7 +331,7 @@ impl OpCode for Symlink {
     }
 
     fn on_event(self: Pin<&mut Self>, _: &Event) -> Poll<io::Result<usize>> {
-        syscall!(libc::symlink(self.target.as_ptr(), self.source.as_ptr()))?;
+        syscall!(libc::symlink(self.source.as_ptr(), self.target.as_ptr()))?;
         Poll::Ready(Ok(0))
     }
 }

compio-fs/tests/utils.rs

@@ -1,3 +1,5 @@
+use std::io::Write;
+
 #[compio_macros::test]
 async fn path_read_write() {
     let temp = tempfile::tempdir().unwrap();
@@ -81,3 +83,57 @@ async fn remove() {
     compio_fs::remove_dir(&new_dir).await.unwrap();
     assert!(compio_fs::metadata(&new_dir).await.is_err());
 }
+
+#[compio_macros::test]
+async fn test_hard_link() {
+    let dir = tempfile::tempdir().unwrap();
+    let src = dir.path().join("src.txt");
+    let dst = dir.path().join("dst.txt");
+
+    std::fs::File::create(&src)
+        .unwrap()
+        .write_all(b"hello")
+        .unwrap();
+
+    compio_fs::hard_link(&src, &dst).await.unwrap();
+
+    std::fs::File::create(&src)
+        .unwrap()
+        .write_all(b"new-data")
+        .unwrap();
+
+    let content = compio_fs::read(&dst).await.unwrap();
+    assert_eq!(content, b"new-data");
+
+    // test that this is not a symlink:
+    assert!(std::fs::read_link(&dst).is_err());
+}
+
+#[compio_macros::test]
+#[cfg(unix)]
+async fn test_symlink() {
+    let dir = tempfile::tempdir().unwrap();
+    let src = dir.path().join("src.txt");
+    let dst = dir.path().join("dst.txt");
+
+    std::fs::File::create(&src)
+        .unwrap()
+        .write_all(b"hello")
+        .unwrap();
+
+    compio_fs::symlink(&src, &dst).await.unwrap();
+
+    std::fs::File::create(&src)
+        .unwrap()
+        .write_all(b"new-data")
+        .unwrap();
+
+    let content = compio_fs::read(&dst).await.unwrap();
+    assert_eq!(content, b"new-data");
+
+    let read = std::fs::read_link(dst.clone()).unwrap();
+    assert!(read == src);
+
+    let symlink_meta = compio_fs::symlink_metadata(dst.clone()).await.unwrap();
+    assert!(symlink_meta.file_type().is_symlink());
+}