rafs: fix compile error for macos

Fix the compile error for macos due to upgrading fuse-backend-rs.

Signed-off-by: Xin Yin <[email protected]>

rafs/src/fs.rs

@@ -502,6 +502,15 @@ impl FileSystem for Rafs {
     type Inode = Inode;
     type Handle = Handle;
 
+    #[cfg(target_os = "macos")]
+    fn init(&self, _opts: FsOptions) -> Result<FsOptions> {
+        Ok(
+            // These fuse features are supported by rafs by default.
+            FsOptions::ASYNC_READ | FsOptions::BIG_WRITES | FsOptions::ATOMIC_O_TRUNC,
+        )
+    }
+
+    #[cfg(target_os = "linux")]
     fn init(&self, _opts: FsOptions) -> Result<FsOptions> {
         Ok(
             // These fuse features are supported by rafs by default.
@@ -823,7 +832,10 @@ impl FileSystem for Rafs {
         _flags: u32,
     ) -> Result<(Option<Self::Handle>, OpenOptions)> {
         // Cache dir since we are readonly
-        Ok((None, OpenOptions::CACHE_DIR | OpenOptions::KEEP_CACHE))
+        #[cfg(target_os = "macos")]
+        return Ok((None, OpenOptions::KEEP_CACHE));
+        #[cfg(target_os = "linux")]
+        return Ok((None, OpenOptions::CACHE_DIR | OpenOptions::KEEP_CACHE));
     }
 
     fn releasedir(&self, _ctx: &Context, _inode: u64, _flags: u32, _handle: u64) -> Result<()> {