Function esp_vfs_register_fs_with_id 

pub unsafe extern "C" fn esp_vfs_register_fs_with_id(
    vfs: *const esp_vfs_fs_ops_t,
    flags: c_int,
    ctx: *mut c_void,
    id: *mut esp_vfs_id_t,
) -> esp_err_t

Analog of esp_vfs_register_with_id which accepts esp_vfs_fs_ops_t instead.