diff --git a/components/dfs/Kconfig b/components/dfs/Kconfig
index 39eca3c507..442c3bb260 100644
--- a/components/dfs/Kconfig
+++ b/components/dfs/Kconfig
@@ -14,13 +14,11 @@ if RT_USING_DFS
 
     config DFS_FILESYSTEMS_MAX
         int "The maximal number of mounted file system"
-        default 4 if RT_USING_DFS_NFS
-        default 2
+        default 4
 
     config DFS_FILESYSTEM_TYPES_MAX
         int "The maximal number of file system type"
-        default 4 if RT_USING_DFS_NFS
-        default 2
+        default 4
 
     config DFS_FD_MAX
         int "The maximal number of opened files"
diff --git a/components/dfs/filesystems/devfs/devfs.c b/components/dfs/filesystems/devfs/devfs.c
index 2e2248d5cc..d615482452 100644
--- a/components/dfs/filesystems/devfs/devfs.c
+++ b/components/dfs/filesystems/devfs/devfs.c
@@ -313,15 +313,13 @@ static const struct dfs_filesystem_ops _device_fs =
     "devfs",
     DFS_FS_FLAG_DEFAULT,
     &_device_fops,
-
     dfs_device_fs_mount,
-    RT_NULL,
-    RT_NULL,
-    RT_NULL,
-
-    RT_NULL,
+    RT_NULL, /*unmount*/
+    RT_NULL, /*mkfs*/
+    RT_NULL, /*statfs*/
+    RT_NULL, /*unlink*/
     dfs_device_fs_stat,
-    RT_NULL,
+    RT_NULL, /*rename*/
 };
 
 int devfs_init(void)