OP_READ
r->op = OP_READ;
{ OP_READ, "read", read_f, 1, 0 },
case OP_READ:
log4(OP_SKIPPED, OP_READ, offset, size);
log4(OP_SKIPPED, OP_READ, offset, size);
log4(OP_READ, offset, size, 0);
case OP_READ:
op = OP_READ;
if (op != OP_READ) { /* Complex operation. */
case OP_READ:
fd = open(dev, op == OP_READ ? O_RDONLY : O_WRONLY);
op == OP_READ ? "reading" : "writing");
if (op == OP_READ)