Fix clippy warnings from macOS port

Signed-off-by: Cong Wang <cwang@multikernel.io>

Author: congwang-mk

src/fs.rs

@@ -1873,11 +1873,11 @@ impl Filesystem for BranchFs {
             match nix::sys::statvfs::statvfs(storage_path) {
                 Ok(stat) => {
                     reply.statfs(
-                        stat.blocks().into(),
-                        stat.blocks_free().into(),
-                        stat.blocks_available().into(),
-                        stat.files().into(),
-                        stat.files_free().into(),
+                        stat.blocks(),
+                        stat.blocks_free(),
+                        stat.blocks_available(),
+                        stat.files(),
+                        stat.files_free(),
                         stat.block_size() as u32,
                         stat.name_max() as u32,
                         stat.fragment_size() as u32,

src/platform/linux.rs

@@ -61,15 +61,21 @@ pub struct PassthroughState {
     pub backing_ids: HashMap<u64, BackingId>,
 }
 
-impl PassthroughState {
-    pub fn new() -> Self {
+impl Default for PassthroughState {
+    fn default() -> Self {
         Self {
             next_fh: AtomicU64::new(1),
             backing_ids: HashMap::new(),
         }
     }
 }
 
+impl PassthroughState {
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
 pub fn try_open_passthrough(state: &mut PassthroughState, file: File, reply: ReplyOpen) {
     let backing_id = match reply.open_backing(&file) {
         Ok(id) => id,

src/platform/macos.rs

@@ -46,9 +46,15 @@ pub fn ctl_file_size(_ino: u64) -> u64 {
 
 pub struct PassthroughState {}
 
+impl Default for PassthroughState {
+    fn default() -> Self {
+        Self {}
+    }
+}
+
 impl PassthroughState {
     pub fn new() -> Self {
-        Self {}
+        Self::default()
     }
 }