Fix symlink to directories

rcore-fs-sfs/src/lib.rs

@@ -759,8 +759,6 @@ impl SimpleFileSystem {
         if let Some(block_id) = id {
             let mut super_block = self.super_block.write();
             if super_block.unused_blocks == 0 {
-                let super_block = self.super_block.read();
-                panic!("{:?}", super_block);
                 free_map.set(block_id, true);
                 return None;
             }

rcore-fs-sfs/src/tests.rs

@@ -135,6 +135,10 @@ fn create_then_lookup() -> Result<()> {
         Arc::ptr_eq(&root.lookup("dir1/file2")?, &file2),
         "failed to find dir1/file2"
     );
+    assert!(
+        Arc::ptr_eq(&root.lookup("/")?.lookup("dir1/file2")?, &file2),
+        "failed to find dir1/file2"
+    );
     assert!(
         Arc::ptr_eq(&dir1.lookup("..")?, &root),
         "failed to find .. from dir1"
@@ -161,6 +165,12 @@ fn create_then_lookup() -> Result<()> {
         "failed to find dir1/file2 by weird relative"
     );
 
+    assert!(root.lookup("./dir1/../file2").is_err(), "found non-existent file");
+    assert!(root.lookup("./dir1/../file3").is_err(), "found non-existent file");
+    assert!(root.lookup("/dir1/../dir1/../file3").is_err(), "found non-existent file");
+    assert!(root.lookup("/dir1/../../../dir1/../file3").is_err(), "found non-existent file");
+    assert!(root.lookup("/").unwrap().lookup("dir1/../file2").is_err(), "found non-existent file");
+
     sfs.sync()?;
     Ok(())
 }
@@ -237,6 +247,25 @@ fn test_symlinks() -> Result<()> {
         "failed to find file1 by link2"
     );
 
+    let dir1 = root
+        .create("dir1", FileType::Dir, 0o777)
+        .expect("failed to create dir1");
+    let file2 = dir1
+        .create("file2", FileType::File, 0o777)
+        .expect("failed to create /dir1/file2");
+
+    let link_dir = root
+        .create("link_dir", FileType::SymLink, 0o777)
+        .expect("failed to create link2");
+    let data = "dir1".as_bytes();
+    link_dir.resize(data.len())?;
+    link_dir.write_at(0, data)?;
+
+    assert!(
+        Arc::ptr_eq(&root.lookup_follow("link_dir/file2", 1)?, &file2),
+        "failed to find file2"
+    );
+
     sfs.sync()?;
     Ok(())
 }

rcore-fs/src/vfs.rs

@@ -65,10 +65,9 @@ impl INode {
             }
             // handle absolute path
             if let Some('/') = rest_path.chars().next() {
-                return self
-                    .fs()
-                    .root_inode()
-                    .lookup_follow(&path[1..], follow_times);
+                result = self.fs().root_inode();
+                rest_path = String::from(&rest_path[1..]);
+                continue;
             }
             let name;
             match rest_path.find('/') {
@@ -90,17 +89,17 @@ impl INode {
                         let mut content = [0u8; 256];
                         let len = inode.read_at(0, &mut content)?;
                         if let Ok(path) = str::from_utf8(&content[..len]) {
-                            if let Some('/') = path.chars().next() {
-                                // absolute link
-                                return result
-                                    .fs()
-                                    .root_inode()
-                                    .lookup_follow(&path[1..], follow_times);
-                            } else {
-                                // relative link
-                                // result remains unchanged
-                                rest_path = String::from(path);
-                            }
+                            // result remains unchanged
+                            rest_path = {
+                                let mut new_path = String::from(path);
+                                if let Some('/') = new_path.chars().last() {
+                                    new_path += &rest_path;
+                                } else {
+                                    new_path += "/";
+                                    new_path += &rest_path;
+                                }
+                                new_path
+                            };
                         } else {
                             return Err(FsError::NotDir);
                         }