unlink is only able to delete a file

- add check if the directory entry is a file

src/fs/mem.rs

@@ -352,10 +352,6 @@ impl VfsNode for MemDirectory {
 		if let Some(component) = components.pop() {
 			let node_name = String::from(component);
 
-			if let Some(directory) = self.inner.read().get(&node_name) {
-				return directory.traverse_rmdir(components);
-			}
-
 			if components.is_empty() {
 				let mut guard = self.inner.write();
 
@@ -366,6 +362,8 @@ impl VfsNode for MemDirectory {
 					guard.insert(node_name, obj);
 					return Err(IoError::ENOTDIR);
 				}
+			} else if let Some(directory) = self.inner.read().get(&node_name) {
+				return directory.traverse_rmdir(components);
 			}
 		}
 
@@ -376,20 +374,18 @@ impl VfsNode for MemDirectory {
 		if let Some(component) = components.pop() {
 			let node_name = String::from(component);
 
-			if let Some(directory) = self.inner.read().get(&node_name) {
-				return directory.traverse_unlink(components);
-			}
-
 			if components.is_empty() {
 				let mut guard = self.inner.write();
 
 				let obj = guard.remove(&node_name).ok_or(IoError::ENOENT)?;
-				if obj.get_kind() == NodeKind::Directory {
-					guard.insert(node_name, obj);
-					return Err(IoError::EISDIR);
-				} else {
+				if obj.get_kind() == NodeKind::File {
 					return Ok(());
+				} else {
+					guard.insert(node_name, obj);
+					return Err(IoError::ENOENT);
 				}
+			} else if let Some(directory) = self.inner.read().get(&node_name) {
+				return directory.traverse_unlink(components);
 			}
 		}