Method pwritev2

fs/aligned-file.cpp:188–191

            return this->pwritev2_mutable(iov, iovcnt, offset, 0);
        }
        virtual ssize_t pwritev2(const struct iovec *iov, int iovcnt, off_t offset, int flags) override {
            IOVector iovec(iov, iovcnt);
            return this->pwritev2_mutable(iovec.iovec(), iovec.iovcnt(), offset, flags);
        }
        virtual ssize_t pwritev2_mutable(struct iovec *iov, int iovcnt, off_t offset, int flags) override {
            struct iovec tmpiovec[MAX_TMP_IOVEC_SIZE];
            iovector_view view(tmpiovec, MAX_TMP_IOVEC_SIZE);