IORING_URING_CMD_CANCELABLE
if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
cmd->flags |= IORING_URING_CMD_CANCELABLE;
if (cmd->flags & IORING_URING_CMD_CANCELABLE) {
if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
cmd->flags &= ~IORING_URING_CMD_CANCELABLE;