block_write
block_write(fd, &bytes, sizeof(bytes));
block_write(fd, buf, ntohl(bytes));
block_write(fd, &bytes, sizeof(bytes));
block_write(fd, buf, ntohl(bytes));
sc->block_write = true;
sc->block_write = false;
if (sc->block_write) {
bool block_write; /* block write or block read */