如何在linux上实现写事务?全写还是不写

我已经找到了实现事务的方法,但不知道这种方法的陷阱。关键是 truncate 允许我们实现回滚逻辑的系统调用。这是一个伪代码:

file1Pos = file1.tell()
file2Pos = file2.tell()

err = file1.write(bytes1)
if err != nil {
    // rollback to previous position
    file1.truncate(file1Pos)
    // The file offset is not changed after truncation
    file1.seek(file1Pos, SEEK_SET)
}

err = file2.write(bytes2)
if err != nil {
    file1.truncate(file1Pos)
    file1.seek(file1Pos, SEEK_SET)

    file2.truncate(file2Pos)
    file2.seek(file2Pos, SEEK_SET)
}