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: i32,
    ctx: *mut c_void,
    id: *mut i32,
) -> i32

Analog of esp_vfs_register_with_id which accepts esp_vfs_fs_ops_t instead.