Merge "libsnapshot: chunk iov writes" into main

        return false;

    }

    if (!data.empty()) {

        const auto ret = pwritev(fd_, data.data(), data.size(), next_data_pos_);

        if (ret != total_data_size) {

        int total_written = 0;

        int i = 0;

        while (i < data.size()) {

            int chunk = std::min(static_cast<int>(data.size() - i), IOV_MAX);

            const auto ret = pwritev(fd_, data.data() + i, chunk, next_data_pos_ + total_written);

            if (ret < 0) {

                PLOG(ERROR) << "write failed chunk size of: " << chunk

                            << " at offset: " << next_data_pos_ + total_written << " " << errno;

                return false;

            }

            total_written += ret;

            i += chunk;

        }

        if (total_written != total_data_size) {

            PLOG(ERROR) << "write failed for data of size: " << data.size()

                        << " at offset: " << next_data_pos_ << " " << ret;

                        << " at offset: " << next_data_pos_ << " " << errno;

            return false;

        }

    }

    header_.op_count += ops.size();

    next_data_pos_ += total_data_size;