fix(storage): keep storage info RPC map encoded (#2942)

Co-authored-by: cxymds <Cxymds@qq.com>

crates/ecstore/src/disk/local.rs

@@ -422,7 +422,7 @@ impl LocalDisk {
                             total: info.total,
                             free: info.free,
                             used: info.used,
-                            used_inodes: info.files - info.ffree,
+                            used_inodes: info.files.saturating_sub(info.ffree),
                             free_inodes: info.ffree,
                             major: info.major,
                             minor: info.minor,

rustfs/src/storage/rpc/health.rs

@@ -236,3 +236,30 @@ impl NodeService {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn local_storage_info_rpc_payload_uses_msgpack_map_encoding() {
+        let info = rustfs_madmin::StorageInfo {
+            disks: Vec::new(),
+            backend: rustfs_madmin::BackendInfo {
+                backend_type: rustfs_madmin::BackendByte::Erasure,
+                standard_sc_data: vec![2, 2],
+                total_sets: vec![1, 1],
+                drives_per_set: vec![4, 4],
+                ..Default::default()
+            },
+        };
+
+        let encoded = encode_msgpack_map(&info).expect("storage info should serialize");
+        assert_eq!(encoded.first().copied(), Some(0x82));
+
+        let mut decoder = Deserializer::new(Cursor::new(encoded));
+        let decoded: rustfs_madmin::StorageInfo = Deserialize::deserialize(&mut decoder).expect("storage info should decode");
+        assert_eq!(decoded.backend.drives_per_set, vec![4, 4]);
+        assert_eq!(decoded.backend.total_sets, vec![1, 1]);
+    }
+}