static inline int64_t mirror_clip_bytes(MirrorBlockJob *s,
                                        int64_t offset,
                                        int64_t bytes)
{
    return MIN(bytes, s->bdev_length - offset);
}
static inline int64_t mirror_clip_bytes(MirrorBlockJob *s,
                                        int64_t offset,
                                        int64_t bytes)
{
    return MIN(bytes, s->bdev_length - offset);
}